/* SPLIT SCREEN STYLES  */
        #split-screen-overlay {
            display: none;
            position: fixed;
            top: 48px;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 900;
            background: var(--bg-primary);
        }

        #split-screen-overlay.active {
            display: flex;
            flex-direction: row;
            gap: 0;
        }

        @media (max-width: 612px) {
            #split-screen-overlay.active {
                flex-direction: column;
            }
        }

        .split-panel {
            display: flex;
            flex-direction: column;
            overflow: hidden;
            background: var(--bg-primary);
            border: none;
            margin: 0;
        }

        .split-panel:first-child {
            border-right: 1px solid var(--border-color);
        }

        @media (max-width: 612px) {
            .split-panel {
                min-height: 0;
            }

            .split-panel:first-child {
                border-right: none;
                border-bottom: 1px solid var(--border-color);
            }
        }

        .split-panel-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 8px;
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border-color);
            height: 28px;
            min-height: 28px;
            flex-shrink: 0;
            gap: 8px;
        }

        .split-panel-header select {
            padding: 2px 20px 2px 6px;
            border: none;
            border-radius: 4px;
            background: transparent;
            color: var(--text-primary);
            font-size: 0.75rem;
            cursor: pointer;
            font-weight: 600;
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 4px center;
            max-width: 100px;
        }

        .split-panel-header select:hover {
            background-color: var(--bg-tertiary);
        }

        .split-panel-header select:focus {
            outline: none;
            background-color: var(--bg-tertiary);
        }

        .split-panel-label {
            font-size: 0.65rem;
            color: var(--text-tertiary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-weight: 500;
            opacity: 0.7;
        }

        .split-panel-content {
            flex: 1;
            overflow: hidden;
            position: relative;
        }

        .split-panel-content iframe {
            width: 100%;
            height: 100%;
            border: none;
            background: var(--bg-primary);
        }

        .split-resize-handle {
            background: transparent;
            cursor: ew-resize;
            width: 5px;
            flex-shrink: 0;
            position: relative;
            z-index: 10;
        }

        .split-resize-handle::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 1px;
            background: var(--border-color);
            transform: translateX(-50%);
        }

        .split-resize-handle::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 3px;
            height: 32px;
            background: var(--text-tertiary);
            border-radius: 2px;
            opacity: 0.4;
            transition: all 0.2s ease;
        }

        @media (max-width: 612px) {
            .split-resize-handle {
                cursor: ns-resize;
                width: auto;
                height: 5px;
            }

            .split-resize-handle::before {
                top: 50%;
                bottom: auto;
                left: 0;
                right: 0;
                width: auto;
                height: 1px;
                transform: translateY(-50%);
            }

            .split-resize-handle::after {
                width: 32px;
                height: 3px;
            }
        }

        .split-resize-handle:hover::after,
        .split-resize-handle.dragging::after {
            opacity: 1;
            background: var(--primary-color);
            width: 4px;
            height: 48px;
        }

        @media (max-width: 612px) {

            .split-resize-handle:hover::after,
            .split-resize-handle.dragging::after {
                width: 48px;
                height: 4px;
            }
        }

        .split-view-selector {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            height: 100%;
            padding: 1.5rem 1rem;
            text-align: center;
            background: linear-gradient(145deg, var(--bg-primary) 0%, color-mix(in srgb, var(--primary-color) 5%, var(--bg-primary)) 100%);
            overflow-y: auto;
            overflow-x: hidden;
        }

        @media (max-width: 612px) {
            .split-view-selector {
                padding: 1rem 0.75rem;
                min-height: 100%;
            }
        }

        .split-view-selector h3 {
            margin: 0 0 0.5rem 0;
            color: var(--text-primary);
            font-size: 1.25rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color, var(--primary-color-hover)));
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .split-view-selector p {
            color: var(--text-secondary);
            margin: 0 0 1.5rem 0;
            font-size: 0.9rem;
        }

        /* In-panel search input - enhanced */
        .split-search-container {
            width: 100%;
            max-width: 340px;
            margin-bottom: 1.5rem;
            position: relative;
        }

        .split-search-input {
            width: 100%;
            padding: 14px 18px 14px 44px;
            background: var(--bg-secondary);
            border: 2px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            color: var(--text-primary);
            font-size: 0.95rem;
            transition: all 0.25s ease;
        }

        .split-search-input::placeholder {
            color: var(--text-tertiary);
        }

        .split-search-input:focus {
            outline: none;
            border-color: var(--primary-color);
            background: var(--bg-primary);
            box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary-color) 15%, transparent),
                0 4px 20px rgba(0, 0, 0, 0.1);
        }

        .split-search-container svg {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            width: 18px;
            height: 18px;
            color: var(--text-tertiary);
            pointer-events: none;
        }

        /* Search results dropdown - enhanced */
        .split-search-results {
            position: absolute;
            top: calc(100% + 4px);
            left: 0;
            right: 0;
            max-height: 280px;
            overflow-y: auto;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
            z-index: 10;
        }

        .split-search-results:empty {
            display: none;
        }

        .split-search-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 12px 16px;
            cursor: pointer;
            color: var(--text-primary);
            border-bottom: 1px solid var(--border-color);
            transition: background 0.15s ease;
        }

        .split-search-item:last-child {
            border-bottom: none;
        }

        .split-search-item:hover {
            background: color-mix(in srgb, var(--primary-color) 8%, transparent);
        }

        .split-search-empty {
            color: var(--text-tertiary);
            text-align: center;
            padding: 20px 16px;
            font-size: 0.85rem;
        }

        .split-search-text {
            display: flex;
            flex-direction: column;
            gap: 3px;
            min-width: 0;
            flex: 1;
        }

        .split-search-text strong {
            font-size: 0.9rem;
            font-weight: 600;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .split-search-item small {
            color: var(--text-tertiary);
            font-size: 0.75rem;
            line-height: 1.3;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            line-clamp: 2;
            overflow: hidden;
        }

        /* View grid - 2 columns, vibrant tiles */
        .split-view-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 14px;
            width: 100%;
            max-width: 340px;
        }

        @media (max-width: 612px) {
            .split-view-grid {
                gap: 10px;
                max-width: 100%;
                padding: 0 4px;
            }
        }

        .split-view-option {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 12px;
            padding: 28px 18px;
            background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
            border: 2px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            min-height: 110px;
            position: relative;
            overflow: hidden;
        }

        @media (max-width: 612px) {
            .split-view-option {
                padding: 18px 10px;
                gap: 8px;
                min-height: 85px;
            }

            .split-view-option svg {
                width: 28px;
                height: 28px;
            }

            .split-view-option span {
                font-size: 0.8rem;
            }
        }

        .split-view-option::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, color-mix(in srgb, var(--primary-color) 10%, transparent), transparent);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        /* --- VIDEO EMBEDS --- */
        .nk-video-embed {
            position: relative;
            cursor: default;
            outline: none;
            transition: box-shadow 0.2s;
        }

        .nk-video-embed:focus,
        .nk-video-embed:focus-within {
            box-shadow: 0 0 0 3px var(--primary-color) !important;
        }

        .nk-video-delete-btn {
            position: absolute;
            top: 5px;
            right: 5px;
            width: 28px;
            height: 28px;
            background: rgba(0, 0, 0, 0.6);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transition: all 0.2s ease;
            z-index: 20;
            font-size: 14px;
        }

        .nk-video-embed:hover .nk-video-delete-btn,
        .nk-video-embed:focus .nk-video-delete-btn,
        .nk-video-embed:focus-within .nk-video-delete-btn {
            opacity: 1;
        }

        .nk-video-delete-btn:hover {
            background: #ef4444;
            border-color: #ef4444;
            transform: scale(1.1);
        }

        /* --- NEW: Video Alignment Control --- */
        .nk-video-align-btn {
            position: absolute;
            top: 5px;
            left: 5px;
            width: 28px;
            height: 28px;
            background: rgba(0, 0, 0, 0.6);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transition: all 0.2s ease;
            z-index: 20;
            font-size: 14px;
        }

        .nk-video-embed:hover .nk-video-align-btn,
        .nk-video-embed:focus .nk-video-align-btn,
        .nk-video-embed:focus-within .nk-video-align-btn {
            opacity: 1;
            transform: scale(1.1);
        }

        /* Newspaper Mode (Float Left) */
        .nk-video-embed.align-left {
            float: left !important;
            margin: 0 1.5rem 1rem 0 !important;
            max-width: 100% !important;
            clear: left;
        }

        /* --- MAP EMBEDS --- */
        .nk-map-embed {
            position: relative;
            cursor: default;
            outline: none;
            transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.2s ease;
            resize: both;
            overflow: hidden;
            min-width: 300px;
            min-height: 200px;
            max-width: 100%;
        }

        .nk-map-embed:hover {
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18) !important;
        }

        .nk-map-embed:focus,
        .nk-map-embed:focus-within {
            box-shadow: 0 0 0 3px var(--primary-color), 0 12px 40px rgba(0, 0, 0, 0.2) !important;
        }

        /* Theater Mode (Viewport Fullscreen) */
        .nk-map-embed.is-viewport-fullscreen {
            position: fixed !important;
            top: 20px !important;
            left: 20px !important;
            right: 20px !important;
            bottom: 20px !important;
            width: calc(100vw - 40px) !important;
            height: calc(100vh - 40px) !important;
            max-width: none !important;
            max-height: none !important;
            z-index: 10000 !important;
            margin: 0 !important;
            border-radius: 12px !important;
            background: var(--bg-primary);
            box-shadow: 0 0 0 100vmax rgba(0, 0, 0, 0.85) !important;
            /* Dim background */
        }

        .nk-map-embed.is-viewport-fullscreen .nk-map-controls {
            opacity: 1 !important;
            /* Always show controls in fullscreen */
        }

        /* Control Bar Container */
        .nk-map-controls {
            position: absolute;
            top: 12px;
            right: 12px;
            display: flex;
            gap: 8px;
            opacity: 0;
            transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
            z-index: 20;
        }

        .nk-map-embed:hover .nk-map-controls,
        .nk-map-embed:focus .nk-map-controls,
        .nk-map-embed:focus-within .nk-map-controls {
            opacity: 1;
        }

        /* Individual Control Buttons */
        .nk-map-btn {
            width: 32px;
            height: 32px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 14px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            transition: all 0.2s ease;
        }

        .nk-map-btn:hover {
            background: rgba(255, 255, 255, 0.9);
            color: #000;
            transform: translateY(-2px);
        }

        /* Special style for Delete button */
        .nk-map-btn.is-delete:hover {
            background: #ef4444;
            color: #fff;
            border-color: #ef4444;
            transform: translateY(-2px) rotate(90deg);
        }

        /* Hide controls in Read Mode */
        .read-mode .nk-map-controls {
            display: flex;
            pointer-events: auto;
            z-index: 50;
        }

        .read-mode .nk-map-controls .nk-map-btn {
            display: none;
            pointer-events: auto;
            cursor: pointer;
        }

        .read-mode .nk-map-controls .nk-map-btn:first-child {
            display: flex;
        }



        .split-view-option:hover {
            border-color: var(--primary-color);
            transform: translateY(-4px) scale(1.02);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18),
                0 0 0 1px color-mix(in srgb, var(--primary-color) 30%, transparent);
        }

        .split-view-option:hover::before {
            opacity: 1;
        }

        .split-view-option:active {
            transform: translateY(-2px) scale(1.01);
        }

        .split-view-option svg {
            width: 36px;
            height: 36px;
            color: var(--primary-color);
            transition: transform 0.3s ease;
            position: relative;
            z-index: 1;
        }

        .split-view-option:hover svg {
            transform: scale(1.1);
        }

        .split-view-option span {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-primary);
            position: relative;
            z-index: 1;
        }

        /* Compact close button */
        .split-close-btn {
            background: transparent;
            border: none;
            padding: 4px;
            cursor: pointer;
            color: var(--text-tertiary);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.15s ease;
        }

        .split-close-btn:hover {
            background: var(--danger-color);
            color: var(--text-on-primary);
        }

        /* Header button active state */
        #split-screen-btn.split-active {
            color: var(--primary-color);
            background: color-mix(in srgb, var(--primary-color) 15%, transparent);
            border-radius: var(--border-radius);
        }

        /* Hide host header and make split screen take full window estate */
        body.split-screen-active header {
            display: none !important;
        }

        body.split-screen-active #split-screen-overlay {
            top: 0 !important;
        }

        /* Hide header in split iframe mode */
        body.split-iframe-mode header {
            display: none !important;
        }

        body.split-iframe-mode main {
            height: 100vh !important;
        }

        body.split-iframe-mode #the-line-container {
            display: none;
        }

        /* Hide floating nav menu and triggers in split iframe panels */
        body.split-iframe-mode .floating-nav-trigger,
        body.split-iframe-mode .floating-nav-menu {
            display: none !important;
        }

        /* Compact toolbar for split iframe mode (use mobile-like layout) */
        body.split-iframe-mode .article-controls {
            max-width: 100%;
            left: 0;
            right: 0;
            bottom: 0;
            transform: none;
            border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
            padding: 6px 8px;
            gap: 4px;
        }

        body.split-iframe-mode .article-controls .controls-wrapper {
            flex-wrap: nowrap;
            overflow-x: auto;
            gap: 3px;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }

        body.split-iframe-mode .article-controls .controls-wrapper::-webkit-scrollbar {
            display: none;
        }

        body.split-iframe-mode .article-controls .btn-icon {
            min-width: 32px;
            min-height: 32px;
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }

        body.split-iframe-mode .article-controls .btn-icon svg {
            width: 14px;
            height: 14px;
        }

        body.split-iframe-mode .article-controls .control-divider {
            display: none;
        }

        body.split-iframe-mode .article-controls .btn-gradient-text {
            display: none;
        }


        .hidden {
            display: none !important;
        }

        .btn {
            padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
            border-radius: var(--border-radius);
            border: 1px solid transparent;
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn:disabled {
            cursor: not-allowed;
            opacity: 0.6;
        }

        .btn:focus-visible {
            outline: 2px solid var(--primary-color);
            outline-offset: 2px;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: var(--text-on-primary);
        }

        .btn-primary:hover:not(:disabled) {
            background-color: var(--primary-color-hover);
            transform: translateY(-1px);
        }

        .btn-danger {
            background-color: var(--danger-color);
            color: var(--text-on-primary);
        }

        .btn-danger:hover {
            background-color: var(--danger-color-hover);
        }

        .btn-secondary {
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover:not(:disabled) {
            background-color: color-mix(in srgb, var(--border-color) 50%, var(--bg-tertiary));
        }

        .btn-icon {
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            padding: 0;
            border-radius: 50%;
            width: 36px;
            height: 36px;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .btn-icon i {
            font-size: 18px;
        }

        header .btn-icon svg {
            width: 26px;
            height: 26px;
            stroke-width: 2px;
            fill: none;
            stroke: currentColor;
        }

        .btn-icon:hover {
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
        }

        .btn-icon.btn-primary {
            background-color: var(--primary-color);
            color: var(--text-on-primary);
        }

        .btn-icon.btn-primary:hover:not(:disabled) {
            background-color: var(--primary-color-hover);
        }

        .text-input {
            width: 100%;
            padding: 10px 14px;
            font-size: 0.9rem;
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .text-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 20%, transparent);
        }

        .text-input:read-only {
            background-color: var(--bg-tertiary);
        }

        .btn-icon.is-disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        .category-pill {
            padding: 4px 12px;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--category-pill-text);
            display: inline-flex;
            align-items: center;
            white-space: nowrap;
            transition: background-color 0.2s ease-in-out;
        }


        #install-pwa-btn {
            display: none;
        }

        .welcome-container {
            text-align: center;
            max-width: 600px;
            margin: 5rem auto;
            padding: 2rem;
        }

        .welcome-actions {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            margin-top: 1rem;
        }

        .library-main {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .library-title {
            font-family: var(--font-display);
            font-size: 3rem;
            text-align: center;
            margin: 0;
            background: linear-gradient(45deg, #4facfe, #00f2fe);
            background-clip: text;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .library-header a {
            text-decoration: none;
            color: inherit;
        }

        [data-theme="light"] .library-title {
            background: linear-gradient(45deg, #FF8C42, #FFD05A, #00A896, #A2E869, #05A387);
            background-clip: text;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        [data-theme="dark"] .library-title {
            background: linear-gradient(45deg, #E0B453, #E6845E, #C159A1);
            background-clip: text;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        [data-theme="sepia"] .library-title,
        .focus-mode-title {
            background: linear-gradient(45deg, #8c6d46, #704214);
            background-clip: text;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .search-and-filter-bar {
            display: flex;
            gap: 1.25rem;
            align-items: center;
        }

        .search-bar-container {
            position: relative;
            flex-grow: 1;
        }

        #search-input,
        #flashcard-search-input,
        #tag-search-input {
            width: 100%;
            padding: 12px 16px 12px 40px;
            font-size: 1rem;
            border-radius: 9999px;
            border: 1px solid var(--border-color);
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        #search-input:focus,
        #flashcard-search-input:focus,
        #tag-search-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 20%, transparent);
        }

        .search-bar-container svg {
            position: absolute;
            top: 50%;
            left: 12px;
            transform: translateY(-50%);
            color: var(--text-secondary);
        }

        #search-hint {
            font-size: 0.8rem;
            color: var(--text-secondary);
            height: 1.2em;
            text-align: left;
            padding-left: 8px;
            margin-top: 4px;
        }

        .category-filters {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            margin-top: -6px;
            align-items: center;
        }

        .category-chip {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
            padding: 6px 13px;
            border-radius: 18px;
            font-size: 0.92rem;
            font-weight: 600;
            border: 1.5px solid transparent;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            user-select: none;
            white-space: nowrap;
        }

        .category-chip:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow);
            filter: brightness(1.1);
        }

        /* Unified styling for Action Buttons (Tags, Flash, Snippet) */
        .category-action-btn {
            background: var(--action-button-gradient);
            color: #FFFFFF;
            -webkit-text-fill-color: initial;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
            border: 1px solid rgba(0, 0, 0, 0.15);
            font-weight: 700;
            transition: all 0.2s ease-in-out;
        }

        .category-action-btn:hover {
            border-color: rgba(0, 0, 0, 0.25);
            box-shadow: 0 0 15px rgba(var(--primary-color-rgb, 212, 163, 115), 0.4);
            filter: brightness(1.1);
            transform: translateY(-2px);
        }

        .category-action-btn svg {
            flex-shrink: 0;
        }

        /* Active Category Pill across Library, Snippets, and Flashcards */
        .category-filters .category-chip.active {
            transform: scale(1.05);
            box-shadow: 0 0 12px 2px color-mix(in srgb, var(--primary-color) 45%, transparent);
            border: 1.5px solid var(--primary-color);
            font-weight: 700;
        }

        .category-filters .category-chip.active.action-primary,
        .category-filters .category-chip.active[data-category="All"],
        .category-filters .category-chip.active[onclick*="'All'"] {
            background: var(--primary-color) !important;
            color: var(--text-on-primary, #ffffff) !important;
        }

        /* Unify all category filter button heights */
        .category-filters .category-chip,
        .category-filters .category-pill {
            padding: 6px 13px;
            font-size: 0.92rem;
            height: auto;
        }


        #article-grid-container {
            position: relative;
            min-height: 40vh;
        }

        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: calc(var(--spacing-unit) * 2);
        }

        .article-card {
            padding: calc(var(--spacing-unit) * 2);
            border-left: 5px solid transparent;
            transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background-color 0.2s;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            content-visibility: auto;
            contain-intrinsic-size: 1px 300px;
            backdrop-filter: none !important;
            -webkit-backdrop-filter: none !important;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
        }

        .article-card:hover,
        .article-card:focus-visible {
            transform: translateY(-3px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            outline: 2px solid var(--border-color);
            outline-offset: 2px;
        }

        .article-card:focus {
            outline: none;
        }

        /* --- New Library Search Interaction Styles --- */
        .article-card.search-highlight-card {
            border-left-width: 6px;
            border-left-color: rgba(var(--primary-color-rgb), 0.8) !important;
        }

        .article-card.search-selected-card {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 0 15px 3px rgba(var(--primary-color-rgb), 0.5);
            border: 3px solid var(--primary-color) !important;
            border-left-width: 5px !important;
        }

        .card-category-badge {
            padding: 4px 10px;
            border-radius: 12px;
            font-size: 0.80rem;
            font-weight: 700;
        }

        .library-premium-card .card-category-badge {
            align-self: flex-start;
            margin-bottom: 3px;
        }

        .card-header-info {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 8px;
        }

        /* FIX: Ensure Category Pill and Heart Icon stay apart on Desktop, even for single cards */
        body:not(.mobile-view) .card-header-info .category-pill {
            margin-right: auto;
        }

        .card-read-count-badge {
            padding: 4px 10px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--text-on-sm2);
            flex-shrink: 0;
        }

        .card-title {
            margin: 0 0 auto;
            font-family: var(--article-font-family);
            font-size: 1.2rem;
        }

        .card-footer {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin-top: 12px;
            display: flex;
            flex-wrap: wrap;
            gap: 3.5px;
            justify-content: space-between;
            width: 100%;
        }

        .card-tag-chip {
            background-color: var(--bg-tertiary);
            color: var(--text-secondary);
            padding: 2px 8px;
            border-radius: 10px;
            font-size: 0.7rem;
        }

        .card-word-count,
        .card-date {
            font-size: 0.75rem;
            color: var(--text-secondary);
        }

        .article-view-wrapper {
            display: flex;
            justify-content: center;
            font-family: var(--article-font-family);
            font-size: var(--article-font-size);
            position: relative;
            width: 100%;
            min-height: 100%;
            background-color: var(--bg-secondary);
        }

        .article-container {
            width: 100%;
            max-width: min(1360px, 94vw);
            padding: 2.5rem clamp(1.5rem, 3.5vw, 3.5rem) 20vh;
            margin: 0 auto;
            box-sizing: border-box;
            transition: max-width 0.25s ease, padding 0.25s ease;
        }

        @media (min-width: 1600px) {
            .article-container {
                max-width: min(1480px, 92vw);
                padding: 3rem clamp(2.5rem, 4vw, 4.5rem) 20vh;
            }
        }

        @media (max-width: 1024px) {
            .article-container {
                max-width: 100%;
                padding: 2rem clamp(1.2rem, 2.5vw, 2rem) 20vh;
            }
        }

        .article-view-wrapper .article-container.ui-card {
            background-color: transparent;
            border: none;
            box-shadow: none;
            border-radius: 0;
        }

        body.fullscreen-active .article-container {
            max-width: 100%;
            padding: 1.5rem 2rem 20vh 2rem;
        }

        .article-title-input {
            font-size: clamp(1.75rem, 2.8vw, 2.5rem);
            font-weight: 700;
            font-family: var(--article-font-family);
            width: 100%;
            border: none;
            background: transparent;
            padding: 0;
            margin-bottom: 0;
            color: var(--text-primary);
            outline: none;
            border-left: 3px solid transparent;
            padding-left: 0.3em;
            transition: border-color 0.3s;
        }

        .article-title-input:focus {
            border-left-color: var(--primary-color);
        }

        .title-divider {
            border: none;
            border-top: 1px solid var(--border-color);
            margin: 1.5rem 0;
        }

        #article-content {
            line-height: var(--article-line-height);
            outline: none;
            min-height: 200px;
            overflow-x: auto;
        }

        #article-content p {
            margin-block-start: 0.5em;
            margin-block-end: 0.5em;
        }

        #article-content p:has(> .image-container:only-child) {
            margin-block-start: 0;
            margin-block-end: 0;
            line-height: 0;
        }

        #article-content h2 {
            font-size: 1.5em;
            margin-top: 2em;
            margin-bottom: 1em;
        }

        #article-content blockquote {
            border-left: 3px solid var(--primary-color);
            margin-left: 0;
            padding-left: 1.5em;
            color: color-mix(in srgb, var(--text-primary), transparent 20%);
            font-style: italic;
        }

        #article-content hr {
            border: none;
            border-top: 1px solid var(--border-color);
            margin: 2em 0;
        }

        #article-content .katex-display {
            overflow-x: auto;
            overflow-y: hidden;
            padding: 0.35em 0;
        }

        #article-content .katex {
            font-size: 1.02em;
        }

        .focus-mode-body .katex-display {
            overflow-x: auto;
            overflow-y: hidden;
        }

        /* Inline icons inserted from command palette (behave like text) */
        .nk-inline-icon {
            display: inline-flex;
            align-items: baseline;
            user-select: text;
            -webkit-user-select: text;
            color: inherit;
        }

        .nk-inline-icon i {
            font-size: 1em;
            line-height: 1;
            vertical-align: -0.125em;
            pointer-events: auto;
            cursor: text;
            color: inherit;
        }

        body.write-mode #article-content {
            border-left: 2px solid var(--border-color);
            padding-left: 1em;
            transition: border-color 0.3s;
            scroll-padding-top: 30px;
        }

        #article-content :is(p, span, div, li, td, th, blockquote):not([class*="highlight-"]):not(.rendered-tag):not([class*="text-"]):not([style]):not([data-user-font]) {
            font-family: inherit !important;
            font-size: inherit !important;
            line-height: inherit !important;
            background-color: transparent !important;
        }

        #article-content :is(h1, h2, h3, h4, h5, h6) {
            font-family: var(--article-font-family) !important;
            font-size: revert !important;
            line-height: 1.3 !important;
        }

        body.write-mode #article-content:focus-within {
            border-left-color: var(--primary-color);
        }

        #article-content[contenteditable=true].is-empty::before {
            content: attr(data-placeholder);
            color: var(--text-secondary);
            pointer-events: none;
        }

        #article-content.drag-over {
            outline: 2px dashed var(--primary-color);
            outline-offset: 8px;
            background-color: rgba(var(--primary-color-rgb), 0.1);
        }

        #article-content table {
            width: 100% !important;
            border-collapse: separate;
            border-spacing: 0;
            margin: 1.5em 0;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            overflow: hidden;
            table-layout: auto;
        }

        #article-content th,
        #article-content td {
            border-bottom: 1px solid var(--border-color);
            padding: 12px 16px;
            text-align: left;
            vertical-align: top;
            position: relative;
        }

        #article-content td {
            border-left: 1px solid var(--border-color);
        }

        #article-content td:first-child,
        #article-content th:first-child {
            border-left: none;
        }

        #article-content th {
            background-color: rgba(var(--primary-color-rgb), 0.07);
            font-weight: 600;
        }

        #article-content tr:last-child td {
            border-bottom: none;
        }

        #article-content td:focus-within,
        #article-content th:focus-within {
            background-color: var(--bg-tertiary);
            position: relative;
            z-index: 1;
            outline: 2px solid var(--primary-color);
        }

        #article-content .tile-box-table {
            border: none;
            margin: 1em 0;
            width: auto;
            display: inline-block;
        }

        #article-content .tile-cell {
            font-weight: bold;
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
        }

        #article-content ul.bullet-square {
            list-style-type: square;
        }

        #article-content ul.bullet-triangle {
            list-style-type: '► ';
        }

        #article-content ul.bullet-empty-circle {
            list-style-type: circle;
        }

        #article-content ul.bullet-hyphen {
            list-style-type: '- ';
        }

        ol[type="a"] {
            list-style-type: lower-alpha;
        }

        ul.bullet-empty-circle {
            list-style-type: circle;
        }

        body.write-mode #article-content.is-empty::before {
            content: attr(data-placeholder);
            color: var(--text-secondary);
            pointer-events: none;
            position: absolute;
        }

        body.write-mode #article-content:focus-within {
            border-left-color: var(--primary-color);
        }

        /* --- Checkbox Alignment Fix --- */
        #article-content input[type="checkbox"] {
            vertical-align: middle;
            margin-right: 0.5em;
            position: relative;
            top: 0px;
            cursor: pointer;
            width: 1.1em;
            height: 1.1em;
            accent-color: var(--primary-color);
        }

        /* Clipped Image Border in Read Mode */
        body.read-mode #article-content {
            padding: 0 0.5em;
        }

        body.read-mode #article-content.read-only {
            user-select: none;
            -webkit-user-select: none;
        }

        #article-content[contenteditable=true].is-empty::before {
            content: attr(data-placeholder);
            color: var(--text-secondary);
            pointer-events: none;
        }

        #article-content a {
            color: var(--primary-color);
            text-decoration: underline;
            text-decoration-color: color-mix(in srgb, var(--primary-color) 60%, transparent);
            transition: color 0.2s ease-in-out, text-decoration-color 0.2s ease-in-out;
        }

        #article-content a:hover {
            color: var(--primary-color-hover);
            text-decoration-color: var(--primary-color-hover);
        }



        .article-metadata-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-top: 1rem;
            margin-bottom: -1rem;
            transition: opacity 0.3s;
        }

        .article-view-wrapper[class*="ambiance-"] .article-metadata-bar {
            color: var(--text-primary);
        }

        body.fullscreen-active .article-metadata-bar {
            display: none;
        }

        [class^="highlight-"] {
            padding: 0.1em 0.3em;
            margin: 0 -0.1em;
            border-radius: 4px;
            color: var(--hl-text);
            border-bottom: 2px solid;
        }

        .highlight-1 {
            background-color: var(--hl-1-bg);
            border-color: var(--hl-1-border);
        }

        .highlight-2 {
            background-color: var(--hl-2-bg);
            border-color: var(--hl-2-border);
        }

        .highlight-3 {
            background-color: var(--hl-3-bg);
            border-color: var(--hl-3-border);
        }

        .highlight-4 {
            background-color: var(--hl-4-bg);
            border-color: var(--hl-4-border);
        }

        .highlight-5 {
            background-color: var(--hl-5-bg);
            border-color: var(--hl-5-border);
        }

        .highlight-6 {
            background-color: var(--hl-6-bg);
            border-color: var(--hl-6-border);
        }

        .highlight-7 {
            background-color: var(--hl-7-bg);
            border-color: var(--hl-7-border);
        }

        /* Text Color Styles (Weight 550 by default for perfectly balanced visual prominence) */
        .text-red {
            color: var(--text-red);
            font-weight: 550;
        }

        .text-green {
            color: var(--text-green);
            font-weight: 550;
        }

        .text-blue {
            color: var(--text-blue);
            font-weight: 550;
        }

        .text-magenta {
            color: var(--text-magenta);
            font-weight: 550;
        }

        .text-orange {
            color: var(--text-orange);
            font-weight: 550;
        }

        .text-teal {
            color: var(--text-teal);
            font-weight: 550;
        }

        .text-slate {
            color: var(--text-slate);
            font-weight: 550;
        }

        .text-underline {
            text-decoration: underline;
        }

        .rendered-tag {
            cursor: pointer;
            display: inline;
            padding: 0.1em 0.35em;
            margin: 0 0.08em;
            border-radius: 4px;
            background-color: color-mix(in srgb, var(--text-magenta) 15%, transparent);
            color: var(--text-magenta);
            font-weight: 500;
            text-decoration: none;
            box-decoration-break: clone;
            -webkit-box-decoration-break: clone;
            transition: background-color 0.15s ease, color 0.15s ease;
        }

        .rendered-tag:hover {
            background-color: color-mix(in srgb, var(--text-magenta) 26%, transparent);
        }

        .tag-suggestion {
            color: inherit;
            background: linear-gradient(90deg, transparent, var(--text-magenta) 10%, var(--text-magenta) 90%, transparent) no-repeat bottom / 100% 2px;
            padding-bottom: 2px;
            cursor: pointer;
            transition: color 0.15s ease, background 0.15s ease;
        }

        .tag-suggestion:hover {
            color: var(--text-magenta);
            background: linear-gradient(90deg, transparent, var(--text-magenta) 4%, var(--text-magenta) 96%, transparent) no-repeat bottom / 100% 2.5px;
        }

        #category-view .rendered-tag,
        .focus-mode-body .rendered-tag,
        #mindmap-view .rendered-tag {
            display: none !important;
        }

        /* Sigma Article Mode should not hide Supertags */
        .focus-mode-overlay.sigma-mode-article .focus-mode-body .rendered-tag {
            display: inline-block !important;
        }


        mark.mindmap-snippet {
            background-color: var(--mindmap-snippet-bg);
            border-bottom: 2px solid var(--mindmap-snippet-border);
        }

        #article-content img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            cursor: pointer;
        }

        .image-container {
            position: relative;
            display: inline-flex;
            vertical-align: top;
            margin: 0;
            padding: 0;
            line-height: 0;
        }

        /* Whiteboard Embed - Re-editable indicator */
        .image-container.wb-embed::before {
            content: '✏️';
            position: absolute;
            top: 8px;
            right: 8px;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-primary, #fff);
            border-radius: 50%;
            font-size: 14px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
            z-index: 10;
            opacity: 0;
            transform: scale(0.8);
            transition: opacity 0.2s ease, transform 0.2s ease;
            pointer-events: none;
        }

        .image-container.wb-embed:hover::before {
            opacity: 1;
            transform: scale(1);
        }

        .image-container.wb-embed.selected::before {
            opacity: 1;
            transform: scale(1);
            background: var(--primary-color);
        }

        /* Modern rounded corners for all images */
        .image-container img {
            border-radius: 16px;
            transition: border-radius 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
            display: block;
        }

        .image-container:hover img {
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

        .image-container.align-left {
            float: left;
            margin-right: 1.5em;
            margin-bottom: 0.5em;
            max-width: 50%;
        }

        .image-container.align-right {
            float: right;
            margin-left: 1.5em;
            margin-bottom: 0.5em;
            max-width: 50%;
        }

        .image-container.align-center {
            display: block;
            width: fit-content;
            text-align: center;
            margin: 1em auto;
        }

        .image-container.align-center img {
            display: inline-block;
        }

        .resize-handle {
            position: absolute;
            width: 15px;
            height: 15px;
            background: var(--primary-color);
            border: 2px solid var(--bg-secondary);
            border-radius: 50%;
            display: none;
            z-index: 100;
            pointer-events: auto;
        }

        .resize-handle-se {
            bottom: -6px;
            right: -6px;
            cursor: se-resize;
        }

        .image-container.selected .resize-handle {
            display: block;
            z-index: 100;
        }

        .nk-visual-flashcard.selected .resize-handle {
            display: block;
            z-index: 100;
        }

        .nk-visual-flashcard.selected {
            cursor: default;
        }

        .image-container.selected img {
            outline: 2px solid var(--primary-color);
        }

        /* SURGICAL FIX: Disable image selection UI and toolbar in Study Mode */
        body.study-mode-active .resize-handle,
        body.study-mode-active #image-toolbar {
            display: none !important;
        }

        body.study-mode-active .image-container.selected img {
            outline: none !important;
        }

        .nk-visual-flashcard.selected .nk-vfc-inner {
            outline: 2px solid var(--primary-color);
            border-radius: 16px;
        }

        /* --- NEW --- Command Palette Preview Indicator */
        .article-container.is-in-preview-mode {
            outline: 6px dashed var(--danger-color);
            outline-offset: 3px;
        }

        /* --- NEW --- Image Highlighting & Mind Map Styling */
        #article-content .image-container.highlighted-image img {
            box-shadow: 0 0 0 2px var(--bg-secondary), 0 0 0 4px var(--primary-color);
            filter: contrast(105%);
            border-radius: var(--border-radius);
            transition: all 0.3s ease;
        }

        #article-content .image-container.highlighted-image.selected img {
            box-shadow: 0 0 0 3px var(--bg-secondary), 0 0 0 6px var(--primary-color), 0 0 15px 6px rgba(var(--primary-color-rgb), 0.6);
            outline: none;
        }

        /* --- NEW --- Image Highlighting & Mind Map Styling */
        #article-content .image-container.highlighted-image img {
            box-shadow: 0 0 0 2px var(--bg-secondary), 0 0 0 4px var(--primary-color);
            filter: contrast(105%);
            border-radius: var(--border-radius);
            transition: all 0.3s ease;
        }

        #article-content .image-container.highlighted-image.selected img {
            box-shadow: 0 0 0 3px var(--bg-secondary), 0 0 0 6px var(--primary-color), 0 0 15px 6px rgba(var(--primary-color-rgb), 0.6);
            outline: none;
        }

        .mindmap-node .node-html-content img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
            border-radius: calc(var(--border-radius-lg) - 2px);
            display: block;
        }

        .mindmap-node.image-node .node-html-content {
            padding: 3.5px;
        }

        /* --- External Image Styles --- */
        .image-container.image-external {
            position: relative;
        }

        .image-container.image-external::after {
            content: '🔗';
            position: absolute;
            top: 6px;
            right: 6px;
            font-size: 11px;
            background: rgba(0, 0, 0, 0.6);
            color: white;
            padding: 3px 7px;
            border-radius: 6px;
            opacity: 0;
            pointer-events: none;
            z-index: 5;
            transition: opacity 0.2s ease;
        }

        .image-container.image-external.selected::after {
            opacity: 0.75;
        }

        .image-container.image-load-error img {
            display: none;
        }

        .image-container.image-load-error::before {
            content: '⚠️ Image failed to load';
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 80px;
            min-width: 150px;
            background: var(--bg-tertiary);
            border: 2px dashed var(--border-color);
            border-radius: var(--border-radius);
            color: var(--text-secondary);
            font-size: 0.85rem;
            padding: 12px;
        }


        /* --- NEW: Image Caption System (v2.0 ) --- */
        .image-container {
            --caption-align-items: flex-end;
        }

        .image-container[data-caption-align="top"] {
            --caption-align-items: flex-start;
        }

        .image-container[data-caption-align="middle"] {
            --caption-align-items: center;
        }

        .image-container[data-caption-align="bottom"] {
            --caption-align-items: flex-end;
        }

        .image-caption {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: var(--caption-align-items);
            justify-content: center;
            font-family: var(--font-body);
            font-size: 0.95rem;
            line-height: 1.4;
            padding: 12px;
            text-align: center;
            outline: none;
            max-height: 100%;
            overflow-y: auto;
            background-color: transparent;
            pointer-events: none;
            transition: all 0.2s ease;
            box-sizing: border-box;
            color: #ffffff;
            text-shadow: -1px -1px 0 #000, 1px -1px 0 #000, -1px 1px 0 #000, 1px 1px 0 #000, 0 0 5px rgba(0, 0, 0, 0.7);
        }

        /* === THE 15 CURATED CAPTION THEMES === */
        .image-container[data-caption-theme="sharp-light"] .image-caption {
            color: #ffffff;
            text-shadow: -1px -1px 0 #000, 1px -1px 0 #000, -1px 1px 0 #000, 1px 1px 0 #000, 0 2px 4px rgba(0, 0, 0, 0.5);
        }

        .image-container[data-caption-theme="sharp-dark"] .image-caption {
            color: #111111;
            text-shadow: -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff, 1px 1px 0 #fff, 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .image-container[data-caption-theme="forest"] .image-caption {
            color: #14532d;
            text-shadow: 0 1px 3px rgba(6, 40, 19, 0.9);
        }

        .image-container[data-caption-theme="navy"] .image-caption {
            color: #1e3a8a;
            text-shadow: 0 1px 3px rgba(23, 37, 84, 0.9);
        }

        .image-container[data-caption-theme="maroon"] .image-caption {
            color: #cb1c52;
            text-shadow: 0 1px 3px rgba(76, 5, 25, 0.9);
        }

        .image-container[data-caption-theme="chocolate"] .image-caption {
            color: #431407;
            text-shadow: 0 1px 3px rgba(30, 7, 0, 0.95);
        }

        .image-container[data-caption-theme="charcoal"] .image-caption {
            color: #334155;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
        }

        .image-container[data-caption-theme="sunbeam"] .image-caption {
            color: #fef08a;
            text-shadow: 0 1px 4px rgba(120, 53, 15, 0.85);
        }

        .image-container[data-caption-theme="aqua"] .image-caption {
            color: #7dd3fc;
            text-shadow: 0 1px 4px rgba(8, 47, 73, 0.9);
        }

        .image-container[data-caption-theme="lime"] .image-caption {
            color: #a3e635;
            text-shadow: 0 1px 3px rgba(24, 59, 0, 0.9);
        }

        .image-container[data-caption-theme="rose"] .image-caption {
            color: #fecaca;
            text-shadow: 0 1px 4px rgba(88, 28, 135, 0.8);
        }

        .image-container[data-caption-theme="lavender"] .image-caption {
            color: #e0e7ff;
            text-shadow: 0 1px 4px rgba(49, 46, 129, 0.8);
        }

        .image-container[data-caption-theme="soft-glow"] .image-caption {
            color: #ffffff;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.9);
        }

        .image-container[data-caption-theme="letterpress"] .image-caption {
            color: #e2e8f0;
            text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.7);
        }

        .image-container[data-caption-theme="gold-leaf"] .image-caption {
            color: #fffbeb;
            text-shadow: 0 0 8px #f59e0b, 0 0 12px rgba(245, 158, 11, 0.5);
        }

        .image-caption[contenteditable="true"] {
            background-color: rgba(0, 0, 0, 0.65);
            box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb), 0.7);
            pointer-events: auto;
            cursor: text;
            color: #ffffff !important;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5) !important;
        }

        .image-caption:empty:not([contenteditable="true"])::before {
            content: '';
        }

        .image-caption:empty[contenteditable="true"]::before {
            content: attr(data-placeholder);
            color: rgba(255, 255, 255, 0.7);
            pointer-events: none;
        }




        /*  Image Lightbox Styles --- */
        .lightbox-image-wrapper {
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.2s ease-out;
            cursor: grab;
        }

        .lightbox-image {
            max-width: 95vw;
            max-height: 90vh;
            object-fit: contain;
            user-select: none;
            -webkit-user-drag: none;
        }

        .lightbox-controls {
            position: absolute;
            top: 1rem;
            right: 1rem;
            display: flex;
            gap: 0.5rem;
            background-color: rgba(var(--bg-secondary-rgb), 0.8);
            backdrop-filter: blur(8px);
            padding: 0.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
        }

        .lightbox-controls .btn-icon {
            background-color: var(--bg-secondary);
        }

        .tags-view-container {
            padding: 1.5rem;
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
        }

        .tag-item {
            cursor: pointer;
            background-color: var(--bg-tertiary);
            color: var(--text-secondary);
            padding: 6px 14px;
            border-radius: 16px;
            transition: all 0.2s;
            font-size: 0.9rem;
            font-weight: 500;
            border: 1px solid var(--border-color);
        }

        .tag-item:hover {
            background-color: var(--primary-color);
            color: var(--text-on-primary);
            transform: scale(1.05);
            border-color: transparent;
        }

        .article-tags-display {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
        }

        body.fullscreen-active .article-tags-display {
            display: none;
        }

        .tag-modal-article-title {
            font-weight: bold;
            cursor: pointer;
            padding: 8px;
            border-radius: 6px;
            margin-bottom: 4px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .tag-modal-article-title:hover {
            background-color: var(--bg-tertiary);
        }

        .tag-modal-body {
            max-height: 60vh;
            overflow-y: auto;
            padding: 4px;
        }

        /* === Modern Settings UI Overhaul === */
        .settings-modal-container {
            display: flex;
            width: 1020px !important;
            max-width: 96vw !important;
            height: 720px !important;
            max-height: 92vh !important;
            padding: 0 !important;
            border-radius: 20px !important;
            overflow: hidden;
            background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-lg);
            font-family: var(--font-body);
            animation: settingsModalScaleIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
            box-sizing: border-box;
            text-align: left;
        }

        @keyframes settingsModalScaleIn {
            from { transform: scale(0.97); opacity: 0; }
            to { transform: scale(1); opacity: 1; }
        }

        /* Sidebar styling */
        .settings-sidebar {
            width: 260px;
            background: color-mix(in srgb, var(--bg-tertiary) 20%, var(--bg-secondary));
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            padding: 1.25rem 1rem;
            box-sizing: border-box;
            flex-shrink: 0;
        }

        .settings-sidebar-header {
            margin-bottom: 1rem;
            padding-left: 0.5rem;
        }

        .settings-sidebar-header h3 {
            margin: 0;
            font-family: var(--font-display);
            font-weight: 800;
            font-size: 1.45rem;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            border-bottom: none !important;
            padding-bottom: 0 !important;
        }

        .settings-sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .settings-sidebar-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 12px;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.95rem;
            text-decoration: none;
            cursor: pointer;
            transition: all 0.2s ease;
            user-select: none;
            border: 1px solid transparent;
            box-sizing: border-box;
        }

        .settings-sidebar-item i {
            font-size: 1.15rem;
            color: var(--text-secondary);
            width: 24px;
            text-align: center;
            transition: color 0.2s ease;
        }

        .settings-sidebar-item:hover:not(.locked) {
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }

        .settings-sidebar-item:hover:not(.locked) i {
            color: var(--primary-color);
        }

        .settings-sidebar-item.active {
            background: var(--primary-color);
            color: var(--text-on-primary) !important;
            box-shadow: 0 4px 12px -3px color-mix(in srgb, var(--primary-color) 40%, transparent);
        }

        .settings-sidebar-item.active i {
            color: var(--text-on-primary) !important;
        }

        .settings-sidebar-item.locked {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .sidebar-lock-icon {
            margin-left: auto;
            font-size: 0.8rem;
            opacity: 0.6;
        }

        .sidebar-arrow-icon {
            margin-left: auto;
            font-size: 0.75rem;
            opacity: 0;
            transition: all 0.2s ease;
        }

        .settings-sidebar-item:hover:not(.locked) .sidebar-arrow-icon {
            opacity: 0.5;
            transform: translateX(2px);
        }

        .settings-sidebar-item.active .sidebar-arrow-icon {
            opacity: 1;
            color: var(--text-on-primary);
        }

        /* Settings content pane styling */
        .settings-content-pane {
            flex: 1;
            display: flex;
            flex-direction: column;
            padding: 1.25rem 1.75rem;
            box-sizing: border-box;
            overflow: hidden;
            height: 100%;
            background: var(--bg-secondary);
        }

        .settings-content-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 0.5rem;
            flex-shrink: 0;
        }

        .settings-content-header h3 {
            margin: 0;
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1.45rem;
            color: var(--text-primary);
            border-bottom: none !important;
            padding-bottom: 0 !important;
        }

        .settings-scroll-area {
            flex: 1;
            overflow-y: auto;
            padding-right: 1.75rem;
            margin-bottom: 1.25rem;
            box-sizing: border-box;
            scrollbar-width: thin;
            scrollbar-color: var(--border-color) transparent;
        }

        .settings-scroll-area::-webkit-scrollbar {
            width: 6px;
        }

        .settings-scroll-area::-webkit-scrollbar-track {
            background: transparent;
        }

        .settings-scroll-area::-webkit-scrollbar-thumb {
            background-color: var(--border-color);
            border-radius: 20px;
        }

        /* Settings layout elements */
        .settings-section {
            margin-bottom: 1.25rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
            text-align: left;
        }

        .settings-section:last-of-type {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .settings-section h4 {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-color) !important;
            font-weight: 700;
            font-size: 1.1rem;
            margin-top: 0;
            margin-bottom: 1.25rem;
            text-transform: none;
            letter-spacing: 0;
            border-bottom: none !important;
            padding-bottom: 0 !important;
        }

        .settings-section h4 i {
            font-size: 1.15rem;
        }

        .settings-grid {
            display: grid;
            grid-template-columns: 1fr 240px;
            gap: 0.75rem;
            align-items: center;
            margin-bottom: 0.75rem;
            width: 100%;
            box-sizing: border-box;
        }

        .settings-grid label {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-primary);
            text-align: left;
        }

        .settings-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 4px;
            background: transparent;
            border-bottom: 1px solid var(--border-color) !important;
            margin-bottom: 0 !important;
            box-sizing: border-box;
            transition: background-color 0.2s ease;
            text-align: left;
            width: 100%;
            gap: 1rem;
        }

        .settings-item:last-of-type {
            border-bottom: none !important;
        }

        .settings-item:hover {
            background-color: color-mix(in srgb, var(--bg-tertiary) 30%, transparent) !important;
        }

        .settings-item button,
        .settings-item .btn,
        .settings-item .toggle-switch {
            flex-shrink: 0;
        }

        .settings-item button.btn,
        .settings-item .btn {
            min-width: 110px;
        }

        .settings-label {
            display: flex;
            flex-direction: column;
            gap: 4px;
            text-align: left;
            flex: 1;
        }

        .settings-label b {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-primary);
        }

        .settings-label small {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.4;
        }

        @media (min-width: 769px) {
            .settings-content-pane .modal-buttons {
                display: none !important;
            }
        }

        /* Main mobile settings list styling */
        .settings-nav {
            display: flex;
            flex-direction: column;
            gap: 8px;
            padding: 0;
            border: none;
        }

        .settings-nav-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 18px;
            border-radius: 12px;
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            text-decoration: none;
            cursor: pointer;
            transition: all 0.2s ease;
            box-sizing: border-box;
        }

        .settings-nav-item:hover:not(.locked) {
            border-color: var(--primary-color);
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }

        .settings-nav-item-left {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .settings-nav-item-left i {
            font-size: 1.2rem;
            color: var(--primary-color);
            width: 24px;
            text-align: center;
        }

        .settings-nav-item-left span {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.95rem;
        }

        .settings-nav-item.locked {
            opacity: 0.55;
            cursor: not-allowed;
        }

        /* Modern Form Control Styling */
        .modal-content .text-input,
        .modal-content select,
        .modal-content textarea {
            background: var(--bg-primary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            padding: 10px 14px;
            border-radius: 10px;
            font-weight: 500;
            font-size: 0.9rem;
            outline: none;
            transition: all 0.2s ease;
            width: 100%;
            box-sizing: border-box;
        }

        .modal-content .text-input:focus,
        .modal-content select:focus,
        .modal-content textarea:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 15%, transparent);
        }

        .modal-content select {
            -webkit-appearance: none;
            -moz-appearance: none;
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%236c757d' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 0.85rem center;
            background-size: 1.1em;
            padding-right: 2.5rem;
            text-align: left;
        }

        /* Sliders */
        .modal-content input[type="range"] {
            -webkit-appearance: none;
            appearance: none;
            width: 100%;
            height: 6px;
            background: var(--bg-tertiary);
            border-radius: 4px;
            outline: none;
            transition: background 0.2s;
        }

        .modal-content input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            background: var(--primary-color);
            cursor: pointer;
            border-radius: 50%;
            border: 3px solid var(--bg-secondary);
            box-shadow: var(--shadow);
            transition: transform 0.2s ease;
        }

        .modal-content input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.15);
        }

        .modal-content input[type="range"]::-moz-range-thumb {
            width: 20px;
            height: 20px;
            background: var(--primary-color);
            cursor: pointer;
            border-radius: 50%;
            border: 3px solid var(--bg-secondary);
            box-shadow: var(--shadow);
            transition: transform 0.2s ease;
        }

        .modal-content input[type="range"]::-moz-range-thumb:hover {
            transform: scale(1.15);
        }

        /* Buttons styling */
        .modal-content .btn {
            padding: 10px 18px;
            border-radius: 10px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            border: 1px solid transparent;
        }

        .modal-content .btn-primary {
            background: var(--primary-color);
            color: var(--text-on-primary) !important;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
        }

        .modal-content .btn-primary:hover:not(:disabled) {
            background: var(--primary-color-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        }

        .modal-content .btn-secondary {
            background: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
        }

        .modal-content .btn-secondary:hover:not(:disabled) {
            background: var(--bg-secondary);
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: translateY(-1px);
        }

        .modal-content .btn-danger {
            background: var(--danger-color);
            color: white;
        }

        .modal-content .btn-danger:hover:not(:disabled) {
            background: var(--danger-color-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(220, 53, 69, 0.2);
        }

        /* Modern Toggle Switches override */
        .modal-content .toggle-switch {
            border-radius: 9999px;
            width: 48px;
            height: 26px;
        }

        .modal-content .toggle-switch::before {
            width: 20px;
            height: 20px;
            top: 2px;
            left: 2px;
            box-shadow: var(--shadow-sm);
        }

        .modal-content .toggle-switch.active::before {
            transform: translateX(22px);
        }

        /* Responsive Breakpoints & Utilities */
        .mobile-only {
            display: none !important;
        }

        .desktop-only {
            display: inline-flex !important;
        }

        @media (max-width: 768px) {
            .mobile-only {
                display: inline-flex !important;
            }

            .desktop-only {
                display: none !important;
            }

            .settings-modal-container {
                width: 100vw;
                height: 100vh;
                max-width: 100vw;
                max-height: 100vh;
                border-radius: 0;
                border: none;
                flex-direction: column;
                animation: settingsModalSlideUp 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            }

            @keyframes settingsModalSlideUp {
                from { transform: translateY(60px); opacity: 0; }
                to { transform: translateY(0); opacity: 1; }
            }

            .settings-sidebar {
                display: none !important;
            }

            .settings-content-pane {
                padding: 1.5rem 1.25rem;
                height: 100%;
            }

            .settings-grid {
                grid-template-columns: 1fr;
                gap: 0.5rem;
            }

            .settings-grid label {
                margin-top: 0.5rem;
            }
        }

        /* ELEGANT FLOATING TOOLBAR  */
        .article-controls {
            position: fixed;
            bottom: 0.8rem;
            left: 50%;
            transform: translateX(-50%);
            width: auto;
            display: flex;
            justify-content: center;
            gap: 0;
            /* Refined Glassmorphism */
            background-color: rgba(var(--bg-secondary-rgb), var(--ui-opacity));
            backdrop-filter: blur(var(--blur-intensity));
            -webkit-backdrop-filter: blur(var(--blur-intensity));

            padding: 4px;
            border-radius: 9999px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-lg);

            z-index: 1001;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .toolbar-wrapper.vertical .control-divider {
            width: 80%;
            height: 1px;
            margin: 4px auto;
        }

        .controls-wrapper {
            display: none;
            align-items: center;
            gap: 4px;
        }

        /* --- NEW: Consistent Slider Control Styling --- */
        .slider-control-wrapper {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .slider-control-wrapper input[type="range"] {
            flex-grow: 1;
        }

        .slider-control-wrapper span {
            min-width: 50px;
            text-align: right;
            font-variant-numeric: tabular-nums;
        }

        /* --- Polished Button Styles within the Toolbar --- */
        .article-controls .btn-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: transparent;
            color: var(--text-secondary);
            transition: all 0.2s ease-in-out;
        }

        .article-controls .btn-icon:hover {
            transform: scale(1.1);
            background-color: var(--bg-tertiary);
            color: var(--primary-color);
        }

        /* --- Style for Primary Actions (Edit, Save) --- */
        .article-controls .btn-icon.btn-primary {
            background-color: var(--primary-color);
            color: var(--text-on-primary);
            box-shadow: 0 2px 8px -2px rgba(var(--primary-color-rgb), 0.7);
        }

        .article-controls .btn-icon.btn-primary:hover {
            background-color: var(--primary-color-hover);
            color: var(--text-on-primary);
        }

        /* Mobile-specific adjustments for the floating bar */
        body.mobile-view .article-controls {
            max-width: 95vw;
            bottom: 0.5rem;
            padding: 4px;
        }


        body.read-mode .read-mode-controls,
        body.write-mode .write-mode-controls {
            display: flex;
        }

        .control-divider {
            width: 1px;
            height: 20px;
            background-color: var(--border-color);
        }

        .read-count-badge {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 0.9rem;
            color: var(--text-on-sm2);
            cursor: pointer;
            transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
            background: var(--sm2-level-3);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
            font-family: var(--font-secondary);
        }

        .read-count-badge:hover {
            transform: scale(1.1);
        }

        .controls-wrapper {
            gap: 8px;
        }

        /* --- Modern Category Dropdown Design --- */
        #category-selector {
            appearance: none;
            -webkit-appearance: none;
            -moz-appearance: none;
            background-color: var(--bg-tertiary);
            /* Subtle background */
            color: var(--text-primary);
            border: 1px solid transparent;
            border-radius: 999px;
            /* Pill shape */
            padding: 0 34px 0 16px;
            height: 36px;
            font-size: 0.9rem;
            font-family: var(--font-primary);
            font-weight: 500;
            cursor: pointer;
            /* Custom Chevron Arrow */
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 10px center;
            background-size: 14px;
            transition: all 0.2s ease;
            min-width: 130px;
            white-space: nowrap;
            text-overflow: ellipsis;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
        }

        #category-selector:hover {
            background-color: var(--bg-primary);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
            transform: translateY(-1px);
        }

        #category-selector:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.15);
        }

        /* Dark mode adjustment for arrow (optional, assuming stroke is hex) */
        @media (prefers-color-scheme: dark) {
            #category-selector {
                background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23aaa' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            }
        }


        .done-btn-animated {
            animation: heart-pop 0.8s ease-in-out;
        }

        @keyframes heart-pop {
            0% {
                transform: scale(1);
            }

            25% {
                transform: scale(1.4);
            }

            50% {
                transform: scale(1.1);
            }

            100% {
                transform: scale(1);
            }
        }

        body.fullscreen-active header,
        body.fullscreen-active .article-controls {
            transform: translateY(100%);
            opacity: 0;
            pointer-events: none;
        }

        body.fullscreen-active header {
            display: none;
        }

        #focus-mode-toggle {
            position: fixed;
            bottom: 1.1rem;
            right: 1.5rem;
            z-index: 1002;
            display: none;
            animation: fadeIn 0.3s;
        }

        body.fullscreen-active #focus-mode-toggle {
            display: block;
        }

        #focus-mode-toggle.exit-active {
            animation: slow-pulse 4s infinite;
        }

        @keyframes slow-pulse {

            0%,
            100% {
                transform: scale(1);
                opacity: 0.8;
            }

            50% {
                transform: scale(1.05);
                opacity: 1;
            }
        }

        .category-summary-card {
            padding: 16px;
            margin-bottom: 16px;
        }

        .category-summary-card h3 {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .snippet {
            font-size: 0.95rem;
            color: var(--text-secondary);
            border-left: 3px solid var(--border-color);
            padding-left: 12px;
            margin: 3px 0;
            cursor: default;
            line-height: 1.5;
        }

        .snippet:hover {
            background-color: var(--bg-tertiary);
        }

        .context-menu {
            position: absolute;
            z-index: 1005;
            background-color: var(--bg-secondary);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 8px;
            display: flex;
            flex-direction: column;
            gap: 4px;
            border: 1px solid var(--border-color);
        }

        .context-menu button {
            background: none;
            border: none;
            text-align: left;
            padding: 8px 12px;
            width: 100%;
            cursor: pointer;
            border-radius: 6px;
            font-size: 0.9rem;
            color: var(--text-primary);
        }

        .context-menu button:hover {
            background-color: var(--bg-tertiary);
        }

        .empty-state {
            display: flex;
            flex-direction: column;
            justify-items: center;
            text-align: center;
            padding: 3rem 1rem;
            color: var(--text-secondary);
            opacity: 0.7;
        }

        .empty-state svg {
            display: block;
            width: 64px;
            height: 64px;
            margin: 0 auto 1rem auto;
            opacity: 0.7;
        }

        #toast-container {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 99999;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 10px;
        }

        .toast {
            background-color: #333;
            color: white;
            padding: 12px 20px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.4s ease;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 1rem;
            line-height: 1.4;
            max-width: 350px;
        }

        .toast.show {
            opacity: 1;
            transform: translateY(0);
        }

        .toast.error {
            background-color: var(--danger-color);
        }

        .toast.success {
            background-color: var(--success-color);
        }

        .toast.warning {
            background-color: var(--warning-color);
            color: var(--text-warning);
        }

        .toast small {
            opacity: 0.9;
            font-size: 0.9em;
        }



        #confetti-toast-container {
            position: fixed;
            z-index: 100000;
            pointer-events: none;
        }

        .confetti {
            position: absolute;
            width: 8px;
            height: 8px;
            background-color: var(--primary-color);
            opacity: 0;
            animation: confetti-blast 0.8s ease-out forwards;
        }

        .modal-backdrop {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 10000;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 1rem;
            animation: fadeIn 0.5s ease;
            backdrop-filter: blur(8px);
        }

        .modal-content {
            padding: 2rem;
            max-width: 600px;
            width: 90%;
            box-shadow: var(--shadow-lg);
            animation: fadeIn 0.3s ease;
        }

        .modal-content h3 {
            margin-top: 0;
        }

        .modal-buttons {
            display: flex;
            justify-content: flex-end;
            gap: 1rem;
            margin-top: 1rem;
        }

        .task-area {
            flex-grow: 1;
            overflow-y: auto;
            padding: 1rem 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 12px;
            scrollbar-gutter: stable;
        }

        .task-item {
            display: flex;
            align-items: stretch;
            justify-content: space-between;
            gap: 12px;
            padding: 12px;
            border-radius: var(--border-radius);
            transition: var(--transition-fast);
            background-color: var(--bg-secondary);
            border-left: 4px solid transparent;
        }

        .task-item:hover {
            background-color: var(--bg-tertiary);
            transform: scale(1.01);
        }

        .task-item[data-priority="high"] {
            border-left-color: var(--priority-high);
        }

        .task-item[data-priority="medium"] {
            border-left-color: var(--priority-medium);
        }

        .task-item[data-priority="low"] {
            border-left-color: var(--priority-low);
        }

        .task-item.completed {
            border-left-color: var(--success-color);
            opacity: 0.8;
        }

        .task-item.completed .task-title {
            color: var(--success-color);
        }

        .task-checkbox {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            accent-color: var(--primary-color);
        }

        .task-main {
            display: flex;
            align-items: center;
            gap: 10px;
            flex: 1 1 auto;
            min-width: 0;
        }

        .task-title {
            flex: 1 1 auto;
            white-space: normal;
            word-break: break-word;
            font-size: calc(var(--article-font-size) * 0.9);
            line-height: 1.35;
            transition: color 220ms ease;
        }

        .task-item.is-backlog {
            border-left-color: var(--danger-color) !important;
        }

        .task-item.is-backlog .task-title {
            color: var(--danger-color);
            font-weight: 500;
        }

        .task-trailing {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 8px;
            flex: 0 0 auto;
            min-width: 230px;
        }

        .task-meta {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            flex-wrap: nowrap;
            justify-content: flex-end;
        }

        .task-actions {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
            flex-shrink: 0;
        }

        .task-meta .due-date.overdue {
            color: var(--danger-color);
            font-weight: 500;
        }

        .task-meta .btn-icon {
            width: 32px;
            height: 32px;
        }

        .task-meta .btn-icon svg {
            width: 18px;
            height: 18px;
        }

        .task-meta .btn-danger {
            color: var(--danger-color);
        }

        .task-meta .btn-danger:hover {
            color: var(--danger-color-hover);
            background-color: color-mix(in srgb, var(--danger-color) 15%, transparent);
        }

        .pomo-counter-display {
            display: flex;
            align-items: center;
            gap: 4px;
            font-weight: 500;
            font-size: 0.8rem;
            background-color: var(--bg-tertiary);
            padding: 2px 8px;
            border-radius: 12px;
            white-space: nowrap;
        }

        .pomo-counter-display svg {
            width: 14px;
            height: 14px;
            color: var(--primary-color);
        }

        .task-composer {
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            margin-bottom: 8px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .composer-input-row {
            display: flex;
            gap: 8px;
            align-items: center;
        }

        .composer-actions-row {
            display: flex;
            justify-content: flex-end;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
        }

        .composer-meta-buttons {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        #composer-date-input {
            border: 1px solid var(--border-color);
            background-color: var(--bg-secondary);
            text-align: center;
            font-weight: 500;
            color: var(--text-primary);
            padding: 6px 10px;
            border-radius: 6px;
            font-size: 0.85rem;
        }

        #composer-date-input:focus {
            outline: none;
            box-shadow: 0 0 0 2px var(--primary-color);
        }

        .priority-btn {
            border: none;
            color: var(--text-on-primary);
            font-size: 0.85rem;
            padding: 6px 10px;
            cursor: pointer;
            border-radius: 6px;
            font-weight: 500;
        }

        .priority-btn.high {
            background-color: var(--priority-high);
        }

        .priority-btn.medium {
            background-color: var(--priority-medium);
        }

        .priority-btn.low {
            background-color: var(--priority-low);
        }

        #category-select {
            font-size: 0.85rem;
            padding: 6px 10px;
            border-radius: 6px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            font-weight: 500;
        }

        #pomo-goal-btn {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 10px;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 500;
            cursor: pointer;
        }

        #pomo-goal-btn svg {
            width: 16px;
            height: 16px;
            color: var(--primary-color);
        }

        #add-task-btn {
            width: 32px;
            height: 32px;
            padding-bottom: 8px;
            border-radius: 50%;
            flex-shrink: 0;
            font-size: 1.5rem;
            font-weight: 400;
            line-height: 1.2;
        }

        .pomodoro-section {
            padding: 1.5rem 1.5rem;
            border-top: 1px solid var(--border-color);
            background: var(--bg-tertiary);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            flex-shrink: 0;
            min-height: 180px;
            /* Ensure space for timer even if content lags */
        }

        .pomodoro-display {
            position: relative;
            padding: 10px;
            border-radius: 12px;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
        }

        .pomodoro-progress-frame {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        .progress-segment {
            position: absolute;
            background-color: var(--pomo-color-1);
            transition: background-color 0.5s ease, width 0.1s linear, height 0.1s linear;
        }

        .progress-top {
            top: 0;
            left: 0;
            height: 6px;
            border-radius: 6px 6px 0 0;
        }

        /* --- MODERN ZEN HUB SEPARATOR --- */
        .hub-separator {
            height: 8px;
            width: 96%;
            margin: 0 auto;
            background: var(--bg-tertiary);
            border: 1.8px solid var(--border-color);
            border-radius: 20px;

            cursor: pointer;
            display: flex;
            justify-content: center;
            align-items: center;

            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            z-index: 10;
            user-select: none;
            overflow: hidden;
            opacity: 0.9;
            box-shadow: 0 0 6px -1px var(--primary-color-alpha, rgba(100, 100, 255, 0.2));

        }

        /* "Shimmer" Scanline Effect */
        .hub-separator::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            transition: left 0.5s ease;
            pointer-events: none;
        }

        .hub-separator:hover::before {
            left: 100%;
            transition: left 0.8s ease;
        }

        .hub-separator:hover {
            opacity: 1;
            height: 8px;
            background: var(--primary-color);
            box-shadow: 0 0 12px var(--primary-color-alpha, rgba(99, 102, 241, 0.4));
            border-color: transparent;
        }

        .hub-separator:active {
            transform: scaleX(0.98);
            opacity: 0.9;
        }

        /* Removed .hub-separator-handle styles entirely for minimalism */

        /* Modes */
        /* Info shortcuts help button styling */
        .help-shortcuts-btn {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0;
            flex-shrink: 0;
            font-weight: bold;
            font-size: 0.95rem;
        }

        .settings-section {
            margin-top: 1.5rem;
            border-top: 1px solid var(--border-color);
            padding-top: 1.5rem;
        }

        .settings-section:first-child {
            margin-top: 0;
            border-top: none;
            padding-top: 0;
        }

        .settings-section h4 {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 0;
            margin-bottom: 1rem;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .settings-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 8px 0;
        }

        .settings-label {
            display: flex;
            flex-direction: column;
        }

        .settings-label b {
            font-weight: 500;
        }

        .settings-label small {
            color: var(--text-secondary);
            font-size: 0.85rem;
            word-break: break-all;
        }

        .settings-grid {
            display: grid;
            grid-template-columns: auto 1fr;
            gap: 1rem;
            align-items: center;
        }

        .settings-grid label {
            font-weight: 500;
            justify-self: start;
        }

        .settings-grid .control-span {
            grid-column: 1 / -1;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .toggle-switch {
            width: 50px;
            height: 28px;
            background: var(--bg-tertiary);
            border-radius: 14px;
            position: relative;
            cursor: pointer;
            border: 1px solid var(--border-color);
        }

        .toggle-switch::before {
            content: '';
            position: absolute;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: white;
            top: 2px;
            left: 3px;
            transition: transform 0.2s;
        }

        .toggle-switch.active {
            background: var(--primary-color);
        }

        .toggle-switch.active::before {
            transform: translateX(21px);
        }

        .sync-status-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--danger-color);
            transition: background-color 0.3s;
        }

        .sync-status-dot.active {
            background-color: var(--success-color);
        }

        #custom-theme-controls {
            margin-top: 1.5rem;
            border-top: 1px solid var(--border-color);
            padding-top: 1.5rem;
            display: none;
        }

        .modal-content.is-custom-theme #custom-theme-controls {
            display: block;
        }

        .guide-content {
            display: none;
            margin-top: 1rem;
            max-height: 40vh;
            overflow-y: auto;
            padding: 1rem;
            background-color: var(--bg-primary);
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
        }

        .guide-content code {
            background-color: var(--bg-tertiary);
            padding: 2px 6px;
            border-radius: 4px;
            font-family: monospace;
        }

        .guide-content ol,
        .guide-content ul {
            padding-left: 20px;
        }

        .guide-content li {
            margin-bottom: 0.8rem;
        }

        /* ELEGANT FLOATING TOOLBAR  */
        .toolbar-wrapper {
            display: flex;
            gap: 4px;
            align-items: center;
            padding: 6px;
            background: linear-gradient(145deg, rgba(var(--bg-secondary-rgb), 0.7), rgba(var(--bg-primary-rgb), 0.6));
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: 9999px;
            box-shadow: var(--shadow-lg), inset 0 1px 1px rgba(255, 255, 255, 0.1);
            border: 1px solid color-mix(in srgb, var(--border-color) 60%, transparent);
        }

        .toolbar-wrapper.vertical {
            flex-direction: column;
            width: auto;
            border-radius: var(--border-radius-lg);
        }

        .toolbar-drag-handle {
            cursor: move;
            color: var(--text-secondary);
            padding: 0 4px;
            opacity: 0.6;
            display: flex;
            align-items: center;
            transition: color 0.3s ease, opacity 0.3s ease;
        }

        .toolbar-drag-handle.locked {
            color: var(--primary-color);
            opacity: 1;
        }

        #selection-toolbar .btn-icon {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            transition: all 0.2s ease-in-out;
        }

        #selection-toolbar .btn-icon:hover {
            background-color: color-mix(in srgb, var(--primary-color) 10%, var(--bg-tertiary));
            color: var(--primary-color);
            transform: scale(1.15);
            box-shadow: 0 0 8px color-mix(in srgb, var(--primary-color) 20%, transparent);
        }

        #selection-toolbar .highlight-btn {
            width: 28px !important;
            height: 28px !important;
        }

        #ai-magic-btn {
            color: var(--primary-color);
            animation: ai-glow 4s infinite alternate ease-in-out;

        }

        #ai-magic-btn:hover {
            animation-play-state: paused;
        }

        /* Changes for Bullet */
        .list-toolbar-group {
            position: relative;
        }

        .list-popover {
            position: absolute;
            bottom: 100%;
            left: 50%;
            margin-bottom: 8px;
            background-color: var(--bg-secondary);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            padding: 4px;
            z-index: 1002;
            display: flex;
            visibility: hidden;
            opacity: 0;
            transform: translateX(-50%) translateY(5px);
            transition: all 0.2s ease-out 0.5s;
            transition-property: visibility, opacity, transform;
        }

        .list-toolbar-group:hover .list-popover {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            transition-delay: 0s;
        }

        /* --- NEW: Compact Image Toolbar Styles --- */
        #image-toolbar .toolbar-wrapper {
            padding: 4px;
        }

        #image-toolbar .btn-icon {
            width: 36px;
            height: 36px;
        }

        /* Changes for Toolbar B,I,U */
        .format-toolbar-group {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .format-popover {
            position: absolute;
            bottom: 100%;
            left: 50%;
            margin-bottom: 8px;
            background-color: var(--bg-secondary);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            padding: 4px;
            z-index: 1002;
            display: flex;
            visibility: hidden;
            opacity: 0;
            transform: translateX(-50%) translateY(5px);
            transition: visibility 0s linear 0.5s, opacity 0.2s ease-out 0.5s, transform 0.2s ease-out 0.5s;
        }

        .format-toolbar-group:hover .format-popover {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            transition-delay: 0s;
        }

        .format-popover .btn-icon {
            font-size: 1.2rem;
        }

        /* --- Insert Group Styles (Duplicated from Format Group) --- */
        .insert-toolbar-group {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .insert-popover {
            position: absolute;
            bottom: calc(100% + 10px);
            left: 50%;
            transform: translateX(-50%) translateY(5px);
            background-color: var(--bg-secondary);
            border-radius: 14px;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.13), 0 2px 6px rgba(0, 0, 0, 0.07);
            border: 1px solid var(--border-color);
            padding: 8px;
            z-index: 1002;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 4px;
            width: max-content;
            min-width: 0;
            visibility: hidden;
            opacity: 0;
            transition: visibility 0s linear 0.15s, opacity 0.15s ease-out 0.15s, transform 0.15s cubic-bezier(0.4, 0, 0.2, 1) 0.15s;
        }

        .insert-toolbar-group:hover .insert-popover,
        .insert-toolbar-group.popover-open .insert-popover {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            transition-delay: 0s;
        }

        .insert-popover .btn-icon {
            font-size: 1.1rem;
            width: 44px;
            height: 44px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            touch-action: manipulation;
            -webkit-tap-highlight-color: transparent;
            min-width: 44px;
            min-height: 44px;
        }

        /* Mobile: keep reasonably touchable on small screens */
        @media (max-width: 612px) {
            .insert-popover {
                padding: 9px;
                gap: 6px;
                border-radius: 16px;
            }

            .insert-popover .btn-icon {
                width: 50px;
                height: 50px;
                min-width: 50px;
                min-height: 50px;
                border-radius: 12px;
            }
        }

        /* --- Find in Article Bar --- */
        #nk-find-bar {
            position: fixed;
            top: 4.5rem;
            left: 50%;
            transform: translateX(-50%) translateY(-12px);
            z-index: 1050;
            background: rgba(var(--bg-secondary-rgb), 0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-color);
            border-radius: 14px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15), 0 2px 8px rgba(0, 0, 0, 0.08);
            padding: 8px 10px;
            display: none;
            align-items: center;
            gap: 6px;
            min-width: 280px;
            max-width: min(90vw, 420px);
            opacity: 0;
            transition: opacity 0.18s ease, transform 0.18s cubic-bezier(0.4, 0, 0.2, 1);
        }

        #nk-find-bar.is-visible {
            display: flex;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        #nk-find-input {
            flex: 1;
            border: 1px solid var(--border-color);
            background: var(--bg-primary);
            color: var(--text-primary);
            border-radius: 8px;
            padding: 6px 10px;
            font-size: 0.9rem;
            font-family: var(--font-body);
            outline: none;
            min-width: 0;
            transition: border-color 0.15s;
        }

        #nk-find-input:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb), 0.15);
        }

        .nk-find-count {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
            min-width: 48px;
            text-align: center;
            font-variant-numeric: tabular-nums;
        }

        .nk-find-btn {
            background: transparent;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            border-radius: 8px;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.15s, color 0.15s;
            flex-shrink: 0;
            touch-action: manipulation;
        }

        .nk-find-btn:hover {
            background: var(--bg-tertiary);
            color: var(--primary-color);
        }

        .nk-find-btn:disabled {
            opacity: 0.35;
            cursor: default;
        }

        .nk-find-btn.nk-find-case-active {
            color: var(--primary-color);
            background: rgba(var(--primary-color-rgb), 0.12);
        }

        .nk-find-divider {
            width: 1px;
            height: 20px;
            background: var(--border-color);
            flex-shrink: 0;
        }

        /* Highlight styles for find matches */
        mark.nk-find-hl {
            background: rgba(250, 204, 21, 0.4);
            color: inherit;
            border-radius: 2px;
            padding: 0 1px;
            transition: background 0.15s;
        }

        mark.nk-find-hl.nk-find-hl-current {
            background: rgba(234, 88, 12, 0.55);
            box-shadow: 0 0 0 1.5px rgba(234, 88, 12, 0.6);
            border-radius: 3px;
        }

        /* --- Color Picker Styles --- */
        .color-picker-group {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .color-picker-popover {
            position: absolute;
            bottom: 100%;
            left: 50%;
            margin-bottom: 12px;
            background-color: var(--bg-secondary);
            border-radius: 24px;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            padding: 6px;
            z-index: 1002;
            display: flex;
            gap: 6px;
            visibility: hidden;
            opacity: 0;
            transform: translateX(-50%) translateY(5px);
            /* Wait 0.3s before hiding visibility to allow safe mouse traversal */
            transition: visibility 0s linear 0.3s, opacity 0.2s ease-out, transform 0.2s ease-out;
            pointer-events: none;
        }

        /* Bridge the gap to prevent hover loss - Increased size */
        .color-picker-popover::after {
            content: '';
            position: absolute;
            bottom: -30px;
            left: -10%;
            width: 120%;
            height: 30px;
            background: transparent;
        }

        /* Hover State */
        .color-picker-group:hover .color-picker-popover {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            transition-delay: 0s;
            pointer-events: auto;
        }

        /* Click/Pinned State */
        .color-picker-popover.show {
            visibility: visible;
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            transition-delay: 0s;
            pointer-events: auto;
        }


        .color-circle-btn {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 2px solid transparent;
            /* default border */
            cursor: pointer;
            transition: transform 0.2s, border-color 0.2s;
            position: relative;
        }

        .color-circle-btn:hover {
            transform: scale(1.2);
            z-index: 1;
            border-color: var(--border-color);
        }

        .color-circle-btn.active {
            border-color: var(--text-primary);
            box-shadow: 0 0 0 2px var(--bg-secondary), 0 0 0 4px var(--primary-color);
        }



        /* Changes for Checkbox */
        .nk-checkbox-wrapper {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            margin: 0.3em 0;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        /* Tighter layout inside tables */
        td .nk-checkbox-wrapper,
        th .nk-checkbox-wrapper {
            margin: 0;
            gap: 8px;
            align-items: flex-start;
        }

        .nk-checkbox-wrapper:hover .nk-checkbox-box {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px var(--bg-tertiary);
            transform: scale(1.05);
        }

        /* Unchecked State - Consistent with Text */
        .nk-checkbox-wrapper .nk-checkbox-box {
            width: 18px;
            height: 18px;
            border: 2px solid var(--text-primary);
            border-radius: 6px;
            margin-top: 8.5px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            flex-shrink: 0;
            background-color: transparent;
        }

        td .nk-checkbox-wrapper .nk-checkbox-box,
        th .nk-checkbox-wrapper .nk-checkbox-box {
            margin-top: 9px;
            width: 16px;
            height: 16px;
        }

        /* Checked State - Green Theme */
        .nk-checkbox-wrapper[data-checked="true"] .nk-checkbox-box {
            background-color: var(--text-green);
            border-color: var(--text-green);
            opacity: 1;
        }

        /* Add checkmark icon using SVG inside box when checked */
        .nk-checkbox-wrapper[data-checked="true"] .nk-checkbox-box::after {
            content: '';
            width: 4px;
            height: 8px;
            border: solid var(--bg-primary, #000);
            border-width: 0 2px 2px 0;
            transform: rotate(45deg);
            margin-bottom: 2px;
            margin-left: 1px;
            animation: checkmarkIn 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
        }

        @keyframes checkmarkIn {
            0% {
                transform: rotate(45deg) scale(0);
                opacity: 0;
            }

            100% {
                transform: rotate(45deg) scale(1);
                opacity: 1;
            }
        }

        .nk-checkbox-text {
            outline: none;
            flex-grow: 1;
            transition: all 0.3s ease;
            color: var(--text-primary);
            line-height: 1.5;
        }

        /* Use Theme-Sensitive Green color for Text when Checked */
        .nk-checkbox-wrapper[data-checked="true"] .nk-checkbox-text {
            color: var(--text-green);
            text-decoration: line-through;
            opacity: 0.8;
            transition: all 0.2s ease;
        }


        #new-article-btn {
            width: 30px;
            height: 30px;
            padding: 0;
            gap: 3px;
            border-radius: var(--border-radius);
            flex-shrink: 0;
        }

        @keyframes subtle-glow {

            0%,
            100% {
                box-shadow: 0 0 4px rgba(96, 165, 250, 0);
            }

            50% {
                box-shadow: 0 0 12px rgba(96, 165, 250, 0.5);
            }
        }


        @keyframes subtle-glow-dark {

            0%,
            100% {
                box-shadow: 0 0 4px rgba(147, 197, 253, 0);
            }

            50% {
                box-shadow: 0 0 12px rgba(147, 197, 253, 0.4);
            }
        }



        @keyframes subtle-glow-sepia {

            0%,
            100% {
                box-shadow: 0 0 4px rgba(140, 109, 70, 0);
            }

            50% {
                box-shadow: 0 0 12px rgba(140, 109, 70, 0.5);
            }
        }

        .shortcut-modal-content kbd {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 2px 6px;
            font-family: monospace;
        }

        .cloze-flashcard {
            /* Ambient-sensitive “glass ink” (no bulky borders/shadows) */
            display: inline-block;
            padding: 0.02em 0.42em;
            border-radius: 7px;
            box-decoration-break: clone;
            -webkit-box-decoration-break: clone;
            cursor: pointer;

            background: linear-gradient(180deg, rgba(var(--primary-color-rgb), 0.22), rgba(var(--primary-color-rgb), 0.10));
            border: 1px solid rgba(var(--primary-color-rgb), 0.28);
            border-bottom: 2px dotted rgba(var(--primary-color-rgb), 0.55);

            backdrop-filter: blur(8px) saturate(140%);
            -webkit-backdrop-filter: blur(8px) saturate(140%);

            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.10), 0 8px 18px rgba(0, 0, 0, 0.08);
            transition: transform 0.12s ease, box-shadow 0.2s ease, border-color 0.2s ease;

            font-weight: 900;
            color: color-mix(in srgb, var(--text-primary) 35%, var(--primary-color) 65%);
            text-shadow: 0 1px 0 rgba(0, 0, 0, 0.18), 0 0 9px rgba(var(--primary-color-rgb), 0.20);
        }

        .cloze-flashcard:hover {
            transform: translateY(-1px);
            border-color: rgba(var(--primary-color-rgb), 0.40);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 10px 22px rgba(0, 0, 0, 0.10);
        }

        .flashcard-view-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .flashcard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1rem;
        }

        .flashcard-tile {
            perspective: 1000px;
            background-color: transparent;
            min-height: 165px;
            border-left: 5px solid;
            border-radius: var(--border-radius);
            cursor: pointer;
            content-visibility: auto;
            contain-intrinsic-size: 1px 300px;
            backdrop-filter: none !important;
            -webkit-backdrop-filter: none !important;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
        }

        .flashcard-tile-flipper {
            position: relative;
            width: 100%;
            height: 100%;
            transition: transform 0.7s ease-in-out;
            transform-style: preserve-3d;
        }

        .flashcard-tile.is-flipped .flashcard-tile-flipper {
            transform: rotateY(180deg);
        }

        .flashcard-tile-face {
            width: 100%;
            height: 100%;
            position: absolute;
            display: flex;
            flex-direction: column;
            background-color: var(--bg-secondary);
            border-radius: var(--border-radius);
            padding: 1rem;
            backface-visibility: hidden;
            -webkit-backface-visibility: hidden;
        }

        .flashcard-tile-back {
            transform: rotateY(180deg);
        }

        .flashcard-tile-content {
            font-size: 0.95rem;
            line-height: 1.45;
            flex-grow: 1;
            overflow-y: auto;
            position: relative;
            scrollbar-width: none;
            padding-bottom: 30px;
        }

        .flashcard-tile-content::-webkit-scrollbar {
            display: none;
        }

        .flashcard-tile-footer {
            position: absolute;
            bottom: 8px;
            right: 8px;

            background-color: rgba(var(--bg-secondary-rgb), 0.75);
            backdrop-filter: blur(5px);
            -webkit-backdrop-filter: blur(5px);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            border-radius: var(--border-radius);
            padding: 2px;

            opacity: 0;
            transform: translateY(5px);
            transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out;

            display: flex;
            align-items: center;
            gap: 0;
            z-index: 1;

            backface-visibility: hidden;
            -webkit-backface-visibility: hidden;
        }

        .flashcard-tile:hover .flashcard-tile-front .flashcard-tile-footer {
            opacity: 1;
            transform: translateY(0);
        }

        .flashcard-tile.is-flipped:hover .flashcard-tile-back .flashcard-tile-footer {
            opacity: 1;
            transform: translateY(0);
        }

        .flashcard-tile-footer .btn-icon {
            width: 28px;
            height: 28px;
            color: var(--text-secondary);
            transition: transform 0.15s ease-out, color 0.15s ease-out;
        }

        .flashcard-tile-footer .btn-icon:hover {
            color: var(--primary-color);
            transform: scale(1.15);
        }


        /* --- New Flashcard Search Interaction Styles --- */
        .flashcard-tile.search-highlight-card {
            box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb), 0.5);
        }

        .flashcard-tile.search-selected-card {
            transform: scale(1.03);
            box-shadow: 0 0 15px 3px rgba(var(--primary-color-rgb), 0.6);
            border-left-color: var(--primary-color) !important;
        }

        @media (max-width: 612px) {
            .flashcard-tile-footer {
                opacity: 1;
                transform: none;
                background: transparent;
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                box-shadow: none;
                border: none;
                padding: 0;
                gap: 4px;
            }

            .flashcard-tile-content {
                padding-bottom: 1px;
                -webkit-mask-image: linear-gradient(to bottom, black 85%, transparent 100%);
                mask-image: linear-gradient(to bottom, black 85%, transparent 100%);
            }

            .flashcard-tile-footer .btn-icon {
                width: 28px;
                height: 28px;
                border-radius: 50%;
                background-color: rgba(var(--bg-secondary-rgb), 0.8);
                box-shadow: var(--shadow-sm);
                border: 1px solid var(--border-color);
            }

            .flashcard-tile-footer .btn-icon:hover {
                color: var(--text-secondary);
                transform: none;
                background-color: rgba(var(--bg-secondary-rgb), 0.8);
            }
        }



        .study-view {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 10001;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 1rem;
            padding-bottom: 120px;
        }

        .study-background {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            background-size: cover;
            background-position: center;
        }

        .study-content-container {
            width: 100%;
            flex-grow: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            perspective: 1200px;
        }

        .study-card {
            width: 100%;
            height: 100%;
            max-height: 80vh;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 0.7s ease-in-out;
            cursor: pointer;
        }

        .study-card.is-flipped {
            transform: rotateY(180deg);
        }

        .study-card-face {
            position: absolute;
            width: 100%;
            height: 100%;
            backface-visibility: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
        }

        .study-card-back {
            transform: rotateY(180deg);
        }

        .study-card-content-box {
            width: 100%;
            max-width: 90ch;
            max-height: 100%;
            overflow-y: auto;
            padding: 2rem;
            background-color: var(--bg-secondary);
            border: 3px solid var(--border-color);
            border-radius: var(--border-radius);
            font-size: var(--study-card-font-size, 2.1rem);
            line-height: 1.5;
            font-family: var(--article-font-family);
            text-align: left;
            transition: border-color 0.3s ease;
        }

        .cloze-hidden {
            color: var(--cloze-hidden-text);
            font-weight: bold;
        }

        .cloze-revealed-wrapper {
            /* Ambient-sensitive frosted glass around revealed cloze */
            display: inline-block;
            background: linear-gradient(180deg,
                    rgba(var(--primary-color-rgb), 0.20) 0%,
                    rgba(var(--primary-color-rgb), 0.06) 100%);
            border-radius: 10px;
            padding: 0.10em 0.50em;
            margin: 0 -0.1em;
            border: 1px solid rgba(var(--primary-color-rgb), 0.22);
            backdrop-filter: blur(10px) saturate(160%);
            -webkit-backdrop-filter: blur(10px) saturate(160%);
            box-shadow:
                inset 0 1px 0 rgba(255, 255, 255, 0.10),
                0 10px 26px rgba(0, 0, 0, 0.10);
        }

        .cloze-revealed {
            color: color-mix(in srgb, var(--text-primary) 30%, var(--primary-color) 70%);
            font-weight: 950;
            letter-spacing: 0.01em;
            text-shadow:
                0 1px 0 rgba(0, 0, 0, 0.20),
                0 0 12px rgba(var(--primary-color-rgb), 0.22);
        }

        .study-controls-container {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            padding: 1rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            background-color: rgba(var(--bg-primary-rgb), 0.8);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .study-progress-bar {
            width: 100%;
            max-width: 400px;
            height: 8px;
            -webkit-appearance: none;
            appearance: none;
            background-color: var(--bg-tertiary);
            border-radius: 4px;
            overflow: hidden;
        }

        /* --- Minimal Toolbar for Split Screen / Small Devices --- */
        @media (max-height: 600px),
        (max-width: 500px) {
            .study-controls-container {
                padding: 6px 12px;
                gap: 6px;
                background-color: rgba(var(--bg-primary-rgb), 0.96);
                backdrop-filter: blur(12px);
                border-top: 1px solid var(--border-color);
            }

            .study-progress-bar {
                height: 4px;
                margin-bottom: 2px;
                max-width: 100%;
                border-radius: 2px;
            }

            .study-controls {
                width: 100%;
                justify-content: center;
            }

            .study-controls .srs-rating-group {
                gap: 6px;
                width: 100%;
                justify-content: center;
            }

            .btn-study-rating {
                padding: 6px 0;
                width: 100%;
                max-width: 70px;
                font-size: 0.75rem;
                border-radius: 8px;
                height: 36px;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            body.mobile-view .study-view,
            .study-view {
                padding-bottom: 70px !important;
            }
        }

        .study-progress-bar::-webkit-progress-bar {
            background-color: var(--bg-tertiary);
        }

        .study-progress-bar::-webkit-progress-value {
            background: linear-gradient(90deg,
                    var(--primary-color) 0%,
                    color-mix(in srgb, var(--primary-color) 90%, white) 25%,
                    color-mix(in srgb, var(--primary-color) 80%, white) 50%,
                    color-mix(in srgb, var(--primary-color) 90%, white) 75%,
                    var(--primary-color) 100%);
            background-size: 200% 100%;
            animation: studyProgressFlow 3s linear infinite;
            box-shadow: 0 0 12px color-mix(in srgb, var(--primary-color) 40%, transparent);
            transition: width 0.45s cubic-bezier(0.19, 1, 0.22, 1);
            border-radius: 4px;
        }

        @keyframes studyProgressFlow {
            from {
                background-position: 200% 0;
            }

            to {
                background-position: -200% 0;
            }
        }

        .study-progress-wrapper {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            width: 100%;
            max-width: 400px;
        }

        .study-progress-wrapper .study-progress-bar {
            flex-grow: 1;
        }

        .study-progress-wrapper .study-progress-counter {
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-variant-numeric: tabular-nums;
            white-space: nowrap;
        }

        /* === POLISHED FLASHCARD BUTTONS  === */
        .study-controls {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            max-width: 700px;
            gap: 0.25rem;
        }

        .study-nav-and-ratings {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .study-controls .srs-rating-group {
            display: flex;
            gap: 0.5rem;
        }

        /* Base style for the new "frosted glass" buttons */
        .btn-study-rating {
            border: 1px solid rgba(255, 255, 255, 0.3);
            background-color: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: 9999px;
            padding: 0.75rem 1.25rem;
            font-size: 0.95rem;
            color: var(--text-on-primary);
            font-weight: 600;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
            transition: all 0.2s ease-in-out;
        }

        .btn-study-rating:hover:not(:disabled) {
            transform: translateY(-2px) scale(1.05);
            background-color: rgba(255, 255, 255, 0.25);
        }

        .btn-again:hover:not(:disabled) {
            box-shadow: 0 0 15px 2px var(--sm2-red);
        }

        .btn-hard:hover:not(:disabled) {
            box-shadow: 0 0 15px 2px var(--sm2-orange);
        }

        .btn-good:hover:not(:disabled) {
            box-shadow: 0 0 15px 2px var(--sm2-skyblue);
        }

        .btn-easy:hover:not(:disabled) {
            box-shadow: 0 0 15px 2px var(--sm2-green);
        }

        .btn-hold:hover:not(:disabled) {
            box-shadow: 0 0 15px 2px var(--sm2-purple);
        }

        /* The 'pop' animation on click is preserved */
        .btn-study-rating.btn-popped {
            animation: btn-pop 0.8s ease;
        }

        @keyframes btn-pop {

            0%,
            100% {
                transform: scale(1);
            }

            20% {
                transform: scale(1.2);
            }

            40% {
                transform: scale(0.95);
            }

            60% {
                transform: scale(1.1);
            }
        }

        .btn-again,
        .btn-hard,
        .btn-hold,
        .btn-good,
        .btn-easy {
            background: none;
        }

        .study-controls .btn-icon-nav,
        .study-controls .btn-exit-study {
            width: 35px;
            height: 35px;
            padding: 3px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: var(--transition-fast);
            box-sizing: border-box;
        }

        /* Individual styles for appearance */
        .study-controls .btn-icon-nav {
            background-color: transparent;
            border: none;
            color: var(--text-secondary);
        }

        .study-controls .btn-exit-study {
            background-color: var(--bg-tertiary);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
        }

        /* Hover states remain the same */
        .study-controls .btn-icon-nav:hover:not(:disabled) {
            background-color: var(--bg-tertiary);
            color: var(--text-primary);
        }

        .study-controls .btn-exit-study:hover:not(:disabled) {
            background-color: color-mix(in srgb, var(--danger-color) 10%, var(--bg-tertiary));
            color: var(--danger-color);
            border-color: color-mix(in srgb, var(--danger-color) 40%, var(--border-color));
        }

        .study-controls .btn-icon-nav:disabled {
            opacity: 0.3;
            cursor: not-allowed;
        }

        .mcq-controls-right-group {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        /* Mobile Responsiveness */
        @media (max-width: 680px) {
            .study-controls {
                flex-wrap: wrap;
                justify-content: space-between;
                align-items: center;
                gap: 6px;
            }

            .study-controls .srs-rating-group {
                order: 1;
                width: 100%;
                gap: 4px;
            }

            .btn-study-rating {
                flex-grow: 1;
                padding: 0.75rem 0.5rem;
                font-size: 0.85rem;
            }

            .study-nav-and-ratings,
            .mcq-controls-right-group {
                order: 2;
            }

            .study-controls .btn-icon-nav,
            .study-controls .btn-exit-study {
                width: 35px;
                height: 35px;
            }
        }

        .study-card-content-box.rated-again {
            border-color: var(--sm2-red);
            animation: glow-red 1.5s ease;
        }

        .study-card-content-box.rated-hard {
            border-color: var(--sm2-orange);
            animation: glow-orange 1.5s ease;
        }

        .study-card-content-box.rated-hold {
            border-color: var(--sm2-purple);
            animation: glow-purple 1.5s ease;
        }

        .study-card-content-box.rated-good {
            border-color: var(--sm2-skyblue);
            animation: glow-skyblue 1.5s ease;
        }

        .study-card-content-box.rated-easy {
            border-color: var(--sm2-green);
            animation: glow-green 1.5s ease;
        }

        @keyframes glow-red {

            0%,
            100% {
                box-shadow: 0 0 0px var(--sm2-red);
            }

            50% {
                box-shadow: 0 0 20px var(--sm2-red);
            }
        }

        @keyframes glow-orange {

            0%,
            100% {
                box-shadow: 0 0 0px var(--sm2-orange);
            }

            50% {
                box-shadow: 0 0 20px var(--sm2-orange);
            }
        }

        @keyframes glow-purple {

            0%,
            100% {
                box-shadow: 0 0 0px var(--sm2-purple);
            }

            50% {
                box-shadow: 0 0 20px var(--sm2-purple);
            }
        }

        @keyframes glow-skyblue {

            0%,
            100% {
                box-shadow: 0 0 0px var(--sm2-skyblue);
            }

            50% {
                box-shadow: 0 0 20px var(--sm2-skyblue);
            }
        }

        @keyframes glow-green {

            0%,
            100% {
                box-shadow: 0 0 0px var(--sm2-green);
            }

            50% {
                box-shadow: 0 0 20px var(--sm2-green);
            }
        }

        .btn-again {
            background: linear-gradient(45deg, #C70039, #900C3F);
        }

        .btn-hard {
            background: linear-gradient(45deg, #FF5733, #FF8D1A);
        }

        .btn-hold {
            background: linear-gradient(45deg, var(--sm2-purple), #c084fc);
        }

        .btn-good {
            background: linear-gradient(45deg, var(--sm2-skyblue), #7dd3fc);
        }

        .btn-easy {
            background: linear-gradient(45deg, var(--sm2-green), #4ade80);
        }





        /* CATEGORY SECTIONAL DESIGN */
        /* --- A. The New View Container & Controls (No Change) --- */
        .category-view-container {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .category-controls-hub {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .category-controls-group {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .export-dropdown-container {
            position: relative;
            display: inline-block;
        }

        .export-dropdown-menu {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: 8px;
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            z-index: 10;
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 4px;
            width: 160px;
        }

        .export-dropdown-menu.show {
            display: flex;
        }

        .export-dropdown-menu .btn {
            width: 100%;
            justify-content: flex-start;
        }

        /* --- B. The "Sectional Card" Component --- */
        .sectional-card {
            background-color: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            padding: 1.25rem 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            transition: all 0.2s ease-in-out;
            box-shadow: var(--shadow-sm);
            content-visibility: auto;
            contain-intrinsic-size: 1px 300px;
            margin-bottom: 1rem;
        }

        .sectional-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
            border-color: var(--primary-color);
        }

        .sectional-card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-color);
        }

        .sectional-card-title {
            font-size: 1.25rem;
            font-weight: 600;
            cursor: pointer;
            flex-grow: 1;
        }

        .sectional-card-body {
            display: flex;
            flex-direction: column;
            gap: 0.3rem;
        }

        .snippet {
            font-size: 1.1rem;
            color: var(--text-secondary);
            border-left: 3px solid var(--border-color);
            padding-left: 8px;
            margin: 0;
            cursor: default;
        }

        .sectional-card-body .snippet .image-container,
        .focus-mode-body .snippet .image-container {
            position: relative;
            display: block;
            overflow: hidden;
            border-radius: var(--border-radius-lg);
            width: 100%;
            padding-top: 56.25%;
            background-color: var(--bg-tertiary);
        }

        .sectional-card-body .snippet .image-container img,
        .focus-mode-body .snippet .image-container img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100% !important;
            height: 100% !important;
            object-fit: cover;
            object-position: center;
        }

        /*  Professional styling for the image caption overlay */
        .snippet .image-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0) 100%);
            color: white;
            padding: 0.2rem;
            text-align: center;
            font-size: 0.9rem;
            font-weight: 500;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
            pointer-events: none;
            border-bottom-left-radius: var(--border-radius-lg);
            border-bottom-right-radius: var(--border-radius-lg);
        }

        /* --- C. The Highlight Toggle Effect --- */
        .category-view-container.hide-snippet-colors .snippet [class*="highlight-"],
        .category-view-container.hide-snippet-colors .snippet [class*="text-"],
        .focus-mode-body.hide-snippet-colors .snippet [class*="highlight-"],
        .focus-mode-body.hide-snippet-colors .snippet [class*="text-"] {
            background-color: transparent !important;
            border-color: transparent !important;
            color: var(--text-primary) !important;
            transition: all 0.3s ease-in-out;
        }


        /* --- D. Layout Toggle Button (No Change) --- */
        .layout-toggle-btn {
            display: flex;
            background-color: var(--bg-tertiary);
            padding: 4px;
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
        }

        .layout-toggle-btn .btn-icon {
            width: 36px;
            height: 32px;
            border-radius: 6px;
            color: var(--text-secondary);
        }

        .layout-toggle-btn .btn-icon.active {
            background-color: var(--bg-secondary);
            color: var(--primary-color);
            box-shadow: var(--shadow-sm);
        }

        /* --- E. Masonry Grid Layout --- */
        @media (min-width: 612px) {
            .category-view-container.grid-mode-active .sectional-card-container {
                column-count: 2;
                column-gap: 0.6rem;
            }

            .category-view-container.grid-mode-active .sectional-card {
                break-inside: avoid;
                margin-bottom: 0.6rem;
                width: 100%;
            }
        }

        @media (min-width: 1200px) {
            .category-view-container.grid-mode-active .sectional-card-container {
                column-count: 3;
            }
        }

        .category-view-container.grid-mode-active .sectional-card img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
        }



        /* --- F. Immersive Focus Mode (v2 FINAL POLISH) --- */
        .focus-mode-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background-color: var(--bg-primary);
            z-index: 20000;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
            animation: fadeIn 0.3s ease;
        }

        .focus-mode-content {
            width: 100%;
            max-width: 95vw;
            height: 100%;
            display: flex;
            flex-direction: column;
            text-align: center;
        }

        .focus-mode-title {
            font-weight: 700;
            margin-bottom: 0.25rem;
            padding-bottom: 0.25rem;
            font-size: 1.4rem;
            border-bottom: 1px solid var(--border-color);
            cursor: pointer;
            flex-shrink: 0;
        }

        @media (max-width: 612px) {
            .focus-mode-title {
                font-size: clamp(1.25rem, 6vw, 1.1rem);
                margin-bottom: 0.25rem;
                padding-bottom: 0.25rem;
            }
        }

        .focus-mode-body {
            display: flex;
            flex-direction: column;
            gap: 4px;
            text-align: left;
            overflow-y: auto;
            overflow-x: hidden;
            /* Changed from visible to hidden to prevent horiz scroll */
            padding: 0.5rem;
            font-size: var(--focus-mode-font-size, 1.1rem);
            padding-bottom: 120px;
            scroll-padding-bottom: 120px;
            max-width: 100%;
            /* Ensure it doesn't overflow */
        }

        /* --- SIGMA MODE: FULL WIDTH --- */
        .focus-mode-overlay.sigma-mode-article .focus-mode-body {
            padding: 0;
            max-width: 100%;
            width: 100%;
        }

        /* Prevent selection during laser mode */
        .laser-active,
        .laser-active * {
            user-select: none;
            -webkit-user-select: none;
            cursor: none !important;
        }

        .focus-mode-overlay.sigma-mode-article .focus-mode-body>* {
            max-width: 100% !important;
            box-sizing: border-box;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        /* Style the scrollbar to be less obtrusive and match the app's theme. */
        .focus-mode-body::-webkit-scrollbar {
            width: 10px;
        }

        .focus-mode-body::-webkit-scrollbar-track {
            background: transparent;
        }

        .focus-mode-body::-webkit-scrollbar-thumb {
            background-color: var(--border-color);
            border-radius: 10px;
            border: 2px solid var(--bg-primary);
        }

        .focus-mode-body::-webkit-scrollbar-thumb:hover {
            background-color: var(--text-secondary);
        }

        .focus-mode-body .snippet {
            cursor: pointer;
            transition: all 0.2s ease-in-out;
            border: 2px solid transparent;
            padding: 2px 2px;
            border-radius: var(--border-radius);
            line-height: 1.5;
            width: fit-content;
            max-width: 100%;
        }

        .focus-mode-body .nk-accordion {
            margin: 0.25rem 0;
            box-shadow: none;
        }

        .focus-mode-body .nk-accordion:hover {
            border-color: var(--primary-color);
            box-shadow: var(--shadow-sm);
        }

        .focus-mode-body .snippet,
        .focus-mode-body .nk-text-tile-content,
        .focus-mode-body .nk-mcq-question,
        .focus-mode-body .nk-timeline-title,
        .focus-mode-body .nk-timeline-date,
        .focus-mode-body .nk-accordion-title,
        .focus-mode-body .nk-accordion-content {
            font-size: inherit;
        }

        .focus-mode-body .nk-text-tile {
            display: flex;
            width: 100%;
            max-width: 100% !important;
            margin: 0;
        }

        .focus-mode-body .snippet:focus,
        .focus-mode-body .snippet:hover {
            outline: none;
            border-color: var(--primary-color);
            background-color: var(--bg-tertiary);
        }

        .focus-mode-body .snippet.is-hidden {
            border: 2px dashed var(--border-color);
            background-color: transparent;
        }

        .focus-mode-body .snippet.is-hidden>* {
            opacity: 0.05;
            pointer-events: none;
        }

        .focus-mode-body .snippet.is-hidden:focus,
        .focus-mode-body .snippet.is-hidden:hover {
            background-color: var(--bg-tertiary);
            border-color: var(--primary-color);
            box-shadow: 0 0 12px rgba(var(--primary-color-rgb), 0.4);
        }

        .focus-mode-controls {
            position: fixed;
            bottom: 0.75rem;
            left: 1.5rem;
            transform: none;
            display: flex;
            gap: 8px;
            padding: 6px 10px;
            border-radius: 24px;
            background-color: rgba(var(--bg-secondary-rgb), 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(var(--border-color-rgb), 0.5);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            z-index: 1000;
        }

        .focus-mode-controls .btn-icon,
        .focus-mode-controls .toggle-switch {
            width: 34px;
            height: 34px;
            background-color: var(--bg-primary);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            border: 1px solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-primary);
            transition: all 0.2s ease;
        }

        .focus-mode-controls .btn-icon svg {
            width: 16px;
            height: 16px;
            stroke-width: 2;
        }

        .focus-mode-controls .btn-icon:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            background-color: var(--bg-tertiary);
            border-color: var(--primary-color);
            color: var(--primary-color);
        }

        /* Styles for the new immersive mode toggle */
        .focus-mode-overlay.controls-hidden .focus-mode-controls {
            background: transparent;
            border-color: transparent;
            box-shadow: none;
            backdrop-filter: none;
            -webkit-backdrop-filter: none;
        }

        .focus-mode-overlay.controls-hidden .focus-mode-controls>*:not(.immersive-toggle-btn) {
            opacity: 0;
            transform: scale(0.8);
            pointer-events: none;
            transition: all 0.2s ease-out;
        }

        .immersive-toggle-btn {
            transition: all 0.2s ease-in-out;
        }

        .focus-mode-overlay.controls-hidden .immersive-toggle-btn {
            opacity: 0.5;
            animation: slow-pulse 4s infinite;
        }

        .focus-mode-overlay.controls-hidden .immersive-toggle-btn:hover {
            opacity: 1;
        }

        .focus-mode-overlay.controls-hidden .stage-mode-controls {
            opacity: 0 !important;
            pointer-events: none !important;
        }


        /* Top-right exit button for Immersive Mode */
        #immersive-exit-btn {
            position: fixed;
            top: 20px;
            right: 20px;
            width: 32px;
            height: 32px;
            background: rgba(var(--bg-secondary-rgb), 0.4);
            backdrop-filter: blur(4px);
            border: 1px solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 20002;
            opacity: 0;
            pointer-events: none;
            transition: all 0.3s ease;
            color: var(--text-secondary);
        }

        #immersive-exit-btn:hover {
            background: rgba(var(--bg-secondary-rgb), 0.8);
            transform: scale(1.1);
            color: var(--primary-color);
        }

        .focus-mode-overlay.controls-hidden #immersive-exit-btn {
            opacity: 1;
            pointer-events: auto;
        }

        /* Prevent default blue outline and add custom theme-sensitive 3D effect */
        .focus-mode-body:focus,
        .focus-mode-body:focus-visible {
            outline: none;
            box-shadow: inset 0 0 0 2px var(--primary-color), inset 0 0 20px 5px rgba(var(--primary-color-rgb), 0.15);
        }

        /* --- G. Stage Presentation Mode ("Smart Scroll") --- */
        .focus-mode-overlay.stage-mode-active .focus-mode-content {
            overflow-y: auto;
            display: block;
            height: 100%;
            scrollbar-width: none;
            width: 100%;
            max-width: 100%;
            padding: 2rem 0;
        }

        .focus-mode-overlay.stage-mode-active .focus-mode-content::-webkit-scrollbar {
            display: none;
        }

        .focus-mode-overlay.stage-mode-active .focus-mode-title {
            position: static;
            margin-bottom: 2rem;
            margin-top: 1rem;
            flex-shrink: 0;
            text-align: center;
        }

        .focus-mode-overlay.stage-mode-active .focus-mode-body {
            scroll-behavior: smooth;
            -ms-overflow-style: none;
            scrollbar-width: none;
            overflow: visible;
            height: auto;
            display: block;
            margin: 0 auto;
            max-width: 1400px;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        .focus-mode-overlay.stage-mode-active .focus-mode-body::-webkit-scrollbar {
            display: none;
        }

        .focus-mode-overlay.stage-mode-active .focus-mode-controls {
            display: none;
        }

        .focus-mode-overlay.stage-mode-active .snippet {
            opacity: 0.3;
            transition: opacity 0.4s ease-in-out;
        }

        .focus-mode-overlay.stage-mode-active .snippet.is-visible {
            opacity: 1.0;
        }

        /* FIX: Prevent large objects from fading in Stage Mode */
        .focus-mode-overlay.stage-mode-active .snippet:has(.nk-mcq-block),
        .focus-mode-overlay.stage-mode-active .snippet:has(.nk-accordion),
        .focus-mode-overlay.stage-mode-active .snippet:has(table),
        .focus-mode-overlay.stage-mode-active .nk-mcq-block,
        .focus-mode-overlay.stage-mode-active .nk-accordion {
            opacity: 1 !important;
        }

        .stage-mode-controls {
            position: fixed;
            bottom: 1rem;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            align-items: center;
            gap: 0.25rem;
            padding: 5px 8px;
            border-radius: var(--border-radius-lg);
            background-color: rgba(var(--bg-secondary-rgb), 0.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-lg);
            transition: opacity 0.3s ease-in-out;
            opacity: 0;
            z-index: 20001;
        }

        /*  Only show controls on hover if annotation isn't active */
        .focus-mode-overlay.stage-mode-active:not(.annotation-active):hover .stage-mode-controls,
        .focus-mode-overlay.stage-mode-active .stage-mode-controls:hover {
            opacity: 1;
        }

        .focus-mode-overlay.stage-mode-active {
            padding: 0;
        }

        /* --- H. Stage Mode Articulator & Toolbar Upgrades --- */
        .focus-mode-overlay.articulator-active .focus-mode-body {
            scroll-snap-type: none !important;
            overflow-y: auto !important;
        }

        .focus-mode-overlay.articulator-active .snippet {
            opacity: 1 !important;
            transform: none !important;
            filter: none !important;
        }



        /* More Menu */
        .stage-more-menu-container {
            position: relative;
            display: inline-flex;
            align-items: center;
        }

        .stage-more-popup {
            position: absolute;
            bottom: 120%;
            left: 50%;
            transform: translateX(-50%) translateY(10px);
            background-color: rgba(var(--bg-secondary-rgb), 0.9);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            padding: 0.5rem;
            display: flex;
            flex-direction: row;
            gap: 0.5rem;
            box-shadow: var(--shadow-xl);
            opacity: 0;
            pointer-events: none;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 20002;
            min-width: max-content;
        }

        /* FIX: Restrict hover behavior to devices that support it, to prevent sticky hover on mobile */
        @media (hover: hover) {
            .stage-more-menu-container:hover .stage-more-popup {
                opacity: 1;
                transform: translateX(-50%) translateY(0);
                pointer-events: all;
            }
        }

        .stage-more-menu-container.active .stage-more-popup {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
            pointer-events: all;
        }

        .stage-more-popup::after {
            content: '';
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            border-width: 6px;
            border-style: solid;
            border-color: rgba(var(--bg-secondary-rgb), 0.9) transparent transparent transparent;
        }

        .stage-mode-controls .btn-icon,
        .stage-mode-controls .toggle-switch {
            width: 34px;
            height: 34px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .stage-mode-controls .btn-icon svg {
            width: 20px;
            height: 20px;
        }


        .stage-snippet-counter {
            font-weight: 500;
            color: var(--text-secondary);
            font-variant-numeric: tabular-nums;
            user-select: none;
            padding: 0 4px;
        }

        .stage-progress-indicator {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .progress-dot {
            width: 9px;
            height: 9px;
            background-color: var(--border-color);
            border-radius: 50%;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .progress-dot:hover {
            transform: scale(1.3);
        }

        /* Hide image tool when not in image annotation mode */
        #whiteboard-overlay:not(.has-bg-image) .wb-image-only {
            display: none;
        }

        .progress-dot.active {
            background-color: var(--primary-color);
            transform: scale(1.4);
        }

        /* --- Mobile Responsive Presentation Mode Controls --- */
        @media (max-width: 612px) {

            /* Stage Mode Mobile Fixes - Compact Layout */
            .stage-mode-controls {
                max-width: calc(100vw - 1rem);
                padding: 6px 10px;
                gap: 4px;
                bottom: 0.75rem;
                left: 50%;
                transform: translateX(-50%);
                flex-wrap: nowrap;
                overflow: visible;
                /* Don't cut off More Options popup */
            }

            .stage-mode-controls .btn-icon,
            .stage-mode-controls .toggle-switch {
                width: 32px;
                height: 32px;
                min-width: 32px;
                flex-shrink: 0;
            }

            .stage-mode-controls .btn-icon svg {
                width: 16px;
                height: 16px;
            }

            .stage-mode-controls .control-divider {
                margin: 0 3px;
                height: 20px;
            }

            /* Hide these on mobile - they'll be in More Options */
            .stage-mode-controls>.premium-feature-locked,
            .stage-mode-controls>#teleprompter-toggle-btn,
            .stage-mode-controls>button[title*="Highlight"] {
                display: none !important;
            }

            /* Ensure More Options container is visible and well-positioned */
            .stage-mode-controls .stage-more-menu-container {
                position: static;
            }

            .stage-mode-controls .stage-more-popup {
                bottom: calc(100% + 10px);
                right: auto;
                left: 50%;
                transform: translateX(-50%);
                min-width: auto;
                display: flex;
                flex-wrap: wrap;
                gap: 6px;
                padding: 10px;
                justify-content: center;
                max-width: calc(100vw - 2rem);
            }

            .stage-more-popup::after {
                display: none;
            }

            /* Focus Mode Controls Mobile Fixes */
            .focus-mode-controls {
                left: 50%;
                transform: translateX(-50%);
                max-width: calc(100vw - 1rem);
                padding: 6px 10px;
                gap: 4px;
            }

            .focus-mode-controls .btn-icon,
            .focus-mode-controls .toggle-switch {
                width: 32px;
                height: 32px;
                min-width: 32px;
            }

            .focus-mode-controls .btn-icon svg {
                width: 15px;
                height: 15px;
            }


            /* Ensure focus mode content doesn't overflow */
            .focus-mode-content {
                max-width: 100vw;
                padding: 0 0.5rem;
            }

            .focus-mode-body {
                padding-bottom: 80px;
            }

            /* Mobile Teleprompter Resizer - Make it more accessible */
            body.mobile-view #teleprompter-resizer {
                height: 16px !important;
                background: linear-gradient(90deg, transparent, var(--border-color), transparent);
            }

            body.mobile-view #teleprompter-resizer::before {
                content: '';
                position: absolute;
                left: 50%;
                top: 50%;
                transform: translate(-50%, -50%);
                width: 40px;
                height: 4px;
                background: var(--primary-color);
                border-radius: 2px;
                opacity: 0.6;
            }

            body.mobile-view #teleprompter-resizer:hover::before,
            body.mobile-view #teleprompter-resizer.is-resizing::before {
                opacity: 1;
                width: 60px;
            }

            /* Smart blur disabled styling */
            .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .snippet,
            .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .nk-mcq-block,
            .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .nk-accordion,
            .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .nk-text-tile {
                opacity: 1.0 !important;
            }

            /* Category Header Mobile Responsive */
            .category-header {
                flex-wrap: wrap;
                gap: 8px;
            }

            .category-header .header-controls {
                width: 100%;
                justify-content: flex-start;
                flex-wrap: wrap;
                gap: 6px;
            }

            .category-header .btn-icon {
                width: 32px;
                height: 32px;
                min-width: 32px;
            }

            /* Show mobile-only options in the More Options popup on mobile */
            .stage-more-popup .mobile-only-option {
                display: flex !important;
            }
        }

        /* Hide mobile-only options on desktop - they're already visible in toolbar */
        @media (min-width: 613px) {
            .stage-more-popup .mobile-only-option {
                display: none !important;
            }
        }

        /* Smart blur styles - applies on all screen sizes */
        .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .snippet,
        .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .nk-mcq-block,
        .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .nk-accordion,
        .focus-mode-overlay.stage-mode-active .focus-mode-body.smart-blur-disabled .nk-text-tile {
            opacity: 1.0 !important;
        }

        /* ==========================================================================
           STAGE & ARTICLE MODE - Images, Videos, and Maps Fix
           ========================================================================== */

        /* --- IMAGES: Remove float/alignment in Stage modes - display centered block --- */
        /* Stage mode needs large centered images */
        .focus-mode-overlay.stage-mode-active .image-container.align-left,
        .focus-mode-overlay.stage-mode-active .image-container.align-right {
            float: none !important;
            margin-left: auto !important;
            margin-right: auto !important;
            max-width: 85vw !important;
            display: block !important;
            clear: both !important;
        }

        /* Stage Presentation Mode - Reset ratio-based image container for proper display */
        .focus-mode-overlay.stage-mode-active .snippet .image-container {
            padding-top: 0 !important;
            height: auto !important;
            max-height: 65vh;
            display: block;
            overflow: visible;
            max-width: 85vw;
            margin: 1rem auto;
            position: relative !important;
        }

        .focus-mode-overlay.stage-mode-active .snippet .image-container img {
            position: relative !important;
            width: auto !important;
            height: auto !important;
            max-width: 85vw !important;
            max-height: 60vh;
            object-fit: contain !important;
            object-position: center;
            border-radius: var(--border-radius-lg);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
            display: block;
            margin: 0 auto;
        }

        /* SIGMA ARTICLE MODE - Mimic Read Mode Layout Exactly */

        /* Sigma Article Mode - Standalone images (NOT inside tables) get article styling */
        .focus-mode-overlay.sigma-mode-article .snippet .image-container,
        .focus-mode-overlay.sigma-mode-article .snippet p .image-container,
        .focus-mode-overlay.sigma-mode-article .snippet>.image-container {
            padding-top: 0 !important;
            height: auto !important;
            max-height: none;
            display: block;
            margin: 1.5rem auto;
            max-width: 85vw;
            position: relative !important;
        }

        .focus-mode-overlay.sigma-mode-article .snippet .image-container img,
        .focus-mode-overlay.sigma-mode-article .snippet p .image-container img,
        .focus-mode-overlay.sigma-mode-article .snippet>.image-container img {
            position: relative !important;
            width: auto !important;
            height: auto !important;
            max-width: 85vw !important;
            max-height: 75vh;
            object-fit: contain !important;
            object-position: center;
            border-radius: var(--border-radius-lg);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            display: block;
            margin: 0 auto;
        }

        /* Sigma Article Mode - Images inside tables MUST behave like read mode */
        /* Higher specificity to override any other rules */
        .focus-mode-overlay.sigma-mode-article .snippet table .image-container,
        .focus-mode-overlay.sigma-mode-article table .image-container,
        .focus-mode-overlay.sigma-mode-article td .image-container,
        .focus-mode-overlay.sigma-mode-article th .image-container {
            display: inline-block !important;
            max-width: 100% !important;
            padding-top: 0 !important;
            height: auto !important;
            margin: 0.5rem auto !important;
            float: none !important;
            clear: none !important;
            position: relative !important;
        }

        .focus-mode-overlay.sigma-mode-article .snippet table .image-container img,
        .focus-mode-overlay.sigma-mode-article table .image-container img,
        .focus-mode-overlay.sigma-mode-article td .image-container img,
        .focus-mode-overlay.sigma-mode-article th .image-container img {
            position: relative !important;
            max-width: 100% !important;
            max-height: 300px !important;
            width: auto !important;
            height: auto !important;
            object-fit: contain !important;
            border-radius: var(--border-radius) !important;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12) !important;
            display: block !important;
            margin: 0 auto !important;
        }

        /* Sigma Article Mode - Aligned images not in tables */
        /* But aligned images IN tables should stay in place */
        .focus-mode-overlay.sigma-mode-article table .image-container.align-left,
        .focus-mode-overlay.sigma-mode-article table .image-container.align-right,
        .focus-mode-overlay.sigma-mode-article td .image-container.align-left,
        .focus-mode-overlay.sigma-mode-article td .image-container.align-right {
            float: none !important;
            display: inline-block !important;
            max-width: 100% !important;
            margin: 0.5rem auto !important;
        }

        /* Ensure standalone images (not in snippets) also display correctly */
        .focus-mode-overlay.stage-mode-active .focus-mode-body .image-container,
        .focus-mode-overlay.sigma-mode-article .focus-mode-body .image-container {
            display: block;
            padding: 1rem;
            max-height: 70vh;
            max-width: 85vw;
            margin: 1rem auto;
            position: relative !important;
            padding-top: 0 !important;
            height: auto !important;
        }

        .focus-mode-overlay.stage-mode-active .focus-mode-body .image-container img,
        .focus-mode-overlay.sigma-mode-article .focus-mode-body .image-container img {
            max-width: 85vw;
            max-height: 65vh;
            object-fit: contain !important;
            border-radius: var(--border-radius-lg);
            display: block;
            margin: 0 auto;
            position: relative !important;
            width: auto !important;
            height: auto !important;
        }

        /* --- TABLES: Exact Replica of Read Mode for Sigma Article Mode --- */
        .focus-mode-overlay.sigma-mode-article .article-content-wrapper table {
            width: 100% !important;
            border-collapse: separate;
            border-spacing: 0;
            margin: 1.5em 0;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            overflow: hidden;
            table-layout: auto;
            background-color: transparent;
        }

        .focus-mode-overlay.sigma-mode-article .article-content-wrapper th,
        .focus-mode-overlay.sigma-mode-article .article-content-wrapper td {
            border-bottom: 1px solid var(--border-color);
            padding: 12px 16px;
            text-align: left;
            vertical-align: top;
            position: relative;
            color: inherit;
        }

        .focus-mode-overlay.sigma-mode-article .article-content-wrapper td {
            border-left: 1px solid var(--border-color);
        }

        .focus-mode-overlay.sigma-mode-article .article-content-wrapper td:first-child,
        .focus-mode-overlay.sigma-mode-article .article-content-wrapper th:first-child {
            border-left: none;
        }

        .focus-mode-overlay.sigma-mode-article .article-content-wrapper th {
            background-color: rgba(var(--primary-color-rgb), 0.07);
            font-weight: 600;
        }

        .focus-mode-overlay.sigma-mode-article .article-content-wrapper tr:last-child td {
            border-bottom: none;
        }

        /* --- VIDEOS: Fix Blank Screens & Alignment --- */

        /* 1. Presentation/Stage Mode (Strict Center) - Not Article Mode */
        .focus-mode-overlay.stage-mode-active:not(.sigma-mode-article) .nk-video-embed {
            float: none !important;
            margin: 1.5rem auto !important;
            max-width: 85vw !important;
            display: block !important;
            clear: both !important;
            aspect-ratio: 16 / 9;
            height: auto !important;
            min-height: 200px;
            /* Prevent collapse */
        }

        .focus-mode-overlay.stage-mode-active:not(.sigma-mode-article) .nk-video-embed iframe {
            margin: 0 auto;
            display: block;
        }

        /* 2. Global Video Fix (Ensure dimensions to prevent blankness) */
        .focus-mode-overlay .nk-video-embed iframe {
            width: 100%;
            height: auto;
            min-height: 250px;
            max-width: 100%;
        }

        /* 3. Sigma Article Mode - Enforce Read Mode Behavior & Interaction */
        .focus-mode-overlay.sigma-mode-article .nk-video-embed,
        .focus-mode-overlay.sigma-mode-article .nk-video-embed iframe {
            pointer-events: auto !important;
        }

        /* --- MAPS: Make maps work properly in Stage & Article modes --- */
        .focus-mode-overlay.stage-mode-active .nk-map-embed,
        .focus-mode-overlay.sigma-mode-article .nk-map-embed {
            margin: 1.5rem auto !important;
            max-width: 85vw !important;
            display: block !important;
        }

        .focus-mode-overlay.stage-mode-active .nk-map-embed iframe,
        .focus-mode-overlay.sigma-mode-article .nk-map-embed iframe {
            max-width: 85vw;
            display: block;
            margin: 0 auto;
        }

        /* Ensure maps are interactive in Article mode */
        .focus-mode-overlay.sigma-mode-article .nk-map-embed,
        .focus-mode-overlay.sigma-mode-article .nk-map-embed iframe,
        .focus-mode-overlay.sigma-mode-article .nk-map-embed .nk-map-controls {
            pointer-events: auto !important;
        }

        /* ── COSMIC UPDATE SPLASH OVERLAY ──────────────── */
        .update-splash-overlay {
            position: fixed;
            inset: 0;
            z-index: 999999;
            background: radial-gradient(circle at 50% 40%, rgba(18, 24, 42, 0.96) 0%, rgba(8, 11, 20, 0.98) 100%);
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1.5rem;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }

        .update-splash-overlay.is-active {
            opacity: 1;
            visibility: visible;
        }

        .update-splash-card {
            background: rgba(22, 28, 48, 0.92);
            border: 1px solid rgba(255, 255, 255, 0.12);
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 50px rgba(255, 69, 0, 0.18);
            border-radius: 28px;
            padding: 2.75rem 2.25rem;
            max-width: 420px;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            position: relative;
            transform: scale(0.92);
            transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        .update-splash-overlay.is-active .update-splash-card {
            transform: scale(1);
        }

        .update-splash-card .splash-cosmic-orb {
            position: relative;
            width: 90px;
            height: 90px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
        }

        .update-splash-card .splash-orb-ring {
            position: absolute;
            inset: 0;
            border-radius: 50%;
        }

        .update-splash-card .splash-orb-ring.ring-1 {
            border: 2px dashed rgba(255, 69, 0, 0.85);
            animation: splashSpinClockwise 5s linear infinite;
        }

        .update-splash-card .splash-orb-ring.ring-2 {
            inset: 6px;
            border: 2px solid transparent;
            border-top-color: #06b6d4;
            border-bottom-color: #a855f7;
            animation: splashSpinCounter 3s cubic-bezier(0.4, 0, 0.2, 1) infinite;
        }

        .update-splash-card .splash-orb-center {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, #ff4500, #ff8c00);
            box-shadow: 0 0 30px rgba(255, 69, 0, 0.55), inset 0 2px 4px rgba(255, 255, 255, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            animation: splashPulse 2.2s ease-in-out infinite alternate;
        }

        @keyframes splashSpinClockwise {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        @keyframes splashSpinCounter {
            from { transform: rotate(360deg); }
            to { transform: rotate(0deg); }
        }

        @keyframes splashPulse {
            0% { transform: scale(0.95); box-shadow: 0 0 20px rgba(255, 69, 0, 0.4); }
            100% { transform: scale(1.08); box-shadow: 0 0 40px rgba(255, 69, 0, 0.85); }
        }

        .update-splash-card .splash-title {
            font-size: 1.25rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 0.4rem;
            letter-spacing: -0.01em;
        }

        .update-splash-card .splash-subtitle {
            font-size: 0.88rem;
            color: #94a3b8;
            line-height: 1.45;
            margin-bottom: 1.5rem;
            max-width: 320px;
        }

        .update-splash-card .splash-progress-bar {
            width: 100%;
            height: 4px;
            border-radius: 99px;
            background: rgba(255, 255, 255, 0.08);
            overflow: hidden;
            position: relative;
        }

        .update-splash-card .splash-progress-indeterminate {
            position: absolute;
            top: 0;
            bottom: 0;
            left: -50%;
            width: 50%;
            background: linear-gradient(90deg, #ff4500, #fbbf24, #06b6d4);
            border-radius: 99px;
            animation: splashIndeterminate 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
        }

        @keyframes splashIndeterminate {
            0% { left: -50%; width: 50%; }
            50% { left: 25%; width: 60%; }
            100% { left: 100%; width: 40%; }
        }