/* IMAGE OCCLUSION FLASHCARD STYLES           */
        /* Tile badge for Visual Flashcards */
        .vfc-badge {
            position: absolute;
            bottom: 8px;
            right: 8px;
            width: 28px;
            height: 28px;
            background: rgba(139, 92, 246, 0.9);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            opacity: 0.85;
        }

        .vfc-tile-image {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 80px;
        }

        /* Study View for Image Occlusion cards */
        .study-vfc-image {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 100%;
            min-height: 200px;
        }

        .study-vfc-image img {
            max-width: 100%;
            max-height: 70vh;
            border-radius: 12px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
            object-fit: contain;
        }

        .study-vfc-label {
            margin-top: 16px;
            padding: 8px 16px;
            background: rgba(245, 158, 11, 0.15);
            border-radius: 20px;
            color: var(--text-secondary);
            font-size: 0.85rem;
            font-weight: 500;
        }

        .image-occlusion-type {
            display: flex;
            justify-content: center;
            align-items: center;
        }


        /* VISUAL FLASHCARD COMPONENT (ARTICLE) */

        .nk-visual-flashcard {
            position: relative;
            display: inline-block;
            width: 100%;
            max-width: 700px;
            perspective: 1200px;
            cursor: pointer;
            margin: 1rem 0;
        }

        .nk-vfc-inner {
            position: relative;
            width: 100%;
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
            transform-style: preserve-3d;
        }

        .nk-visual-flashcard.flipped .nk-vfc-inner {
            transform: rotateY(180deg);
        }

        .nk-vfc-front,
        .nk-vfc-back {
            width: 100%;
            backface-visibility: hidden;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
            border: 1px solid var(--border-color);
            background: var(--bg-secondary);
        }

        .nk-vfc-front {
            position: relative;
        }

        .nk-vfc-back {
            position: absolute;
            top: 0;
            left: 0;
            transform: rotateY(180deg);
        }

        .nk-vfc-front img,
        .nk-vfc-back img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* Edit button for Visual Flashcard */
        .nk-vfc-edit-btn {
            position: absolute;
            top: 12px;
            right: 12px;
            width: 32px;
            height: 32px;
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
            color: var(--text-secondary);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        .nk-visual-flashcard:hover .nk-vfc-edit-btn {
            opacity: 1;
        }

        .nk-vfc-edit-btn:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
            box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
        }

        .nk-visual-flashcard.flipped .nk-vfc-edit-btn {
            display: none;
        }

        /* RESPONSIVE */
        @media (max-width: 612px) {
            #whiteboard-overlay {
                padding: 0.5rem;
            }

            #whiteboard-card {
                border-radius: 12px;
            }

            #whiteboard-canvas-container {
                margin: 0 0.5rem 0.5rem 0.5rem;
                border-radius: 0 0 8px 8px;
            }

            #whiteboard-toolbar {
                padding: 0.6rem;
                gap: 0.4rem;
                border-radius: 12px 12px 0 0;
            }

            .wb-tool-btn {
                width: 32px;
                height: 32px;
            }

            /* Reset media queries that might interfere */
            .wb-action-cancel,
            .wb-action-add {
                width: 36px;
                height: 36px;
                position: relative;
                margin: 0;
                top: auto;
                left: auto;
                right: auto;
                transform: none;
            }

            .wb-color-swatch {
                width: 18px;
                height: 18px;
            }

            .wb-zoom-group {
                display: none;
            }

            .wb-text-box {
                font-size: 14px;
                padding: 8px 10px;
            }
        }

        @media (max-width: 480px) {
            .wb-tool-group {
                padding: 3px;
            }

            .wb-tool-btn {
                width: 28px;
                height: 28px;
            }

            .wb-color-group {
                gap: 4px;
                padding: 0 4px;
            }

            .wb-color-swatch {
                width: 16px;
                height: 16px;
            }

            .wb-divider {
                margin: 0 4px;
            }
        }

        #whiteboard-screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: var(--bg-primary);
            z-index: 20001;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease-in-out;
        }

        .focus-mode-overlay.whiteboard-active #whiteboard-screen {
            opacity: 1;
        }

        /* FIX: Hide main stage controls when annotating to avoid clutter */
        .focus-mode-overlay.annotation-active .stage-mode-controls {
            /* Fix: Keep controls visible and interactive in annotation mode */
            opacity: 1;
            pointer-events: auto;
            z-index: 20;
            /* Ensure above canvas */
        }

        /* --- NEW: Interactive Cloze for Focus Mode --- */
        .focus-cloze {
            display: inline-block;
            cursor: pointer;
            background-color: var(--cloze-bg);
            border-bottom: 2px dotted var(--cloze-border);
            padding: 2px 4px;
            border-radius: 4px;
            transition: background-color 0.2s ease;
        }

        .focus-cloze:hover {
            background-color: color-mix(in srgb, var(--cloze-border) 30%, var(--cloze-bg));
        }

        /* By default, the revealed text is hidden */
        .focus-cloze .focus-cloze-revealed {
            display: none;
            color: var(--cloze-revealed-text);
            font-weight: bold;
        }

        /* The placeholder [...] is shown by default */
        .focus-cloze .focus-cloze-hidden {
            display: inline;
            color: var(--cloze-hidden-text);
            font-weight: bold;
        }

        /* When the 'revealed' class is added, swap visibility */
        .focus-cloze.revealed .focus-cloze-revealed {
            display: inline;
        }

        .focus-cloze.revealed .focus-cloze-hidden {
            display: none;
        }

        /* --- NEW: Presentation/Reader Ambiance Themes --- */
        /* Gallery 1: High-Energy Brights */
        .ambiance-lime-ink {
            --bg-primary: #dfffbf;
            --bg-primary-rgb: 223, 255, 191;
            --text-primary: #1a1a1a;
            --primary-color: #007bff;
        }

        .ambiance-goldenrod-pad {
            --bg-primary: #ffea7f;
            --bg-primary-rgb: 255, 234, 127;
            --text-primary: #0d3b66;
            --primary-color: #e11d48;
        }

        .ambiance-mint-chip {
            --bg-primary: #e6fff1;
            --bg-primary-rgb: 230, 255, 241;
            --text-primary: #3e2723;
            --primary-color: #71ffaf;
        }

        .ambiance-aqua-sky {
            --bg-primary: #cffafe;
            --bg-primary-rgb: 207, 250, 254;
            --text-primary: #0c2d48;
            --primary-color: #f97316;
        }

        .ambiance-peach-sorbet {
            --bg-primary: #ffeadb;
            --bg-primary-rgb: 255, 234, 219;
            --text-primary: #5c001f;
            --primary-color: #14b8a6;
        }

        .ambiance-powder-snow {
            --bg-primary: #f9fafb;
            --bg-primary-rgb: 249, 250, 251;
            --text-primary: #000000;
            --primary-color: #3b82f6;
        }

        /* Gallery 2: Sophisticated Darks */
        .ambiance-terminal {
            --bg-primary: #000000;
            --bg-primary-rgb: 0, 0, 0;
            --text-primary: #ffc107;
            --primary-color: #23e000;
        }

        .ambiance-crimson-night {
            --bg-primary: #5c0000;
            --bg-primary-rgb: 92, 0, 0;
            --text-primary: #fdf6e3;
            --primary-color: #d4af37;
        }

        .ambiance-royal-indigo {
            --bg-primary: #2c005c;
            --bg-primary-rgb: 44, 0, 92;
            --text-primary: #ffffff;
            --primary-color: #e83e8c;
        }

        .ambiance-emerald-tablet {
            --bg-primary: #013220;
            --bg-primary-rgb: 1, 50, 32;
            --text-primary: #fff2c5;
            --primary-color: #858585;
        }

        .ambiance-obsidian-ruby {
            --bg-primary: #720072;
            --bg-primary-rgb: 27, 23, 23;
            --text-primary: #fff0f5;
            --primary-color: #1b1717;
        }

        .ambiance-blueprint {
            --bg-primary: #0c2d48;
            --bg-primary-rgb: 12, 45, 72;
            --text-primary: #afeeee;
            --primary-color: #103e65;
        }

        .ambiance-midnight-sun {
            --bg-primary: #222222;
            --bg-primary-rgb: 34, 34, 34;
            --text-primary: #ffa467;
            --primary-color: #2fabe4;
        }

        /* Gallery 3: Natural & Earthy Tones */
        .ambiance-evergreen {
            --bg-primary: #f5f5dc;
            --bg-primary-rgb: 245, 245, 220;
            --text-primary: #004225;
            --primary-color: #cc5500;
        }

        .ambiance-clay-sky {
            --bg-primary: #f0a6dd;
            --bg-primary-rgb: 233, 150, 122;
            --text-primary: #2c3e50;
            --primary-color: #e7d748;
        }

        .ambiance-sandstone-agave {
            --bg-primary: #f0e6d2;
            --bg-primary-rgb: 240, 230, 210;
            --text-primary: #354e3c;
            --primary-color: #5c4033;
        }

        .ambiance-stone-moss {
            --bg-primary: #dddddd;
            --bg-primary-rgb: 211, 211, 211;
            --text-primary: #1e172a;
            --primary-color: #483d8b;
        }

        .ambiance-mahogany {
            --bg-primary: #3d0c02;
            --bg-primary-rgb: 61, 12, 2;
            --text-primary: #f3e5ab;
            --primary-color: #ffbf00;
        }

        .ambiance-riverbed {
            --bg-primary: #2e2b29;
            --bg-primary-rgb: 74, 68, 65;
            --text-primary: #c2c1ba;
            --primary-color: #008080;
        }

        .ambiance-matrix {
            --bg-primary: #000000;
            --bg-primary-rgb: 0, 0, 0;
            --text-primary: #00FF41;
            --primary-color: #00eb3c;
        }

        /* Gallery 4: Monochromatic & Minimalist */
        .ambiance-rosewater {
            --bg-primary: #fff0f5;
            --bg-primary-rgb: 255, 240, 245;
            --text-primary: #720072;
            --primary-color: #dc143c;
        }

        .ambiance-azure-depth {
            --bg-primary: #003153;
            --bg-primary-rgb: 0, 49, 83;
            --text-primary: #e0ffff;
            --primary-color: #7a7a7a;
        }

        .ambiance-olive-grove {
            --bg-primary: #3d402e;
            --bg-primary-rgb: 61, 64, 46;
            --text-primary: #c9c5ac;
            --primary-color: #cfb53b;
        }

        .ambiance-sterling {
            --bg-primary: #e0e0e0;
            --bg-primary-rgb: 224, 224, 224;
            --text-primary: #2c3840;
            --primary-color: #b22222;
        }

        .ambiance-greyscale {
            --bg-primary: #f0f0f0;
            --bg-primary-rgb: 240, 240, 240;
            --text-primary: #333333;
            --primary-color: #000000;
        }

        /* Gallery 5: New Expansion */
        .ambiance-neon-abyss {
            --bg-primary: #0a0a0f;
            --bg-primary-rgb: 10, 10, 15;
            --text-primary: #00ffcc;
            --primary-color: #ff00ff;
        }

        .ambiance-solar-eclipse {
            --bg-primary: #120a06;
            --bg-primary-rgb: 18, 10, 6;
            --text-primary: #ffcc00;
            --primary-color: #ff4500;
        }

        .ambiance-deep-ocean {
            --bg-primary: #021a24;
            --bg-primary-rgb: 2, 26, 36;
            --text-primary: #bfebff;
            --primary-color: #00ffcc;
        }

        .ambiance-cloud-nine {
            --bg-primary: #f0f8ff;
            --bg-primary-rgb: 240, 248, 255;
            --text-primary: #004b73;
            --primary-color: #00bfff;
        }

        /* This rule makes sure the themes apply correctly in all four contexts */
        .focus-mode-overlay[class*="ambiance-"],
        #pdf-viewer-container[class*="ambiance-"],
        .article-view-wrapper[class*="ambiance-"],
        .study-view[class*="ambiance-"] {
            --bg-secondary: var(--bg-primary);
            --bg-tertiary: color-mix(in srgb, var(--text-primary) 10%, var(--bg-primary));
            --border-color: color-mix(in srgb, var(--text-primary) 20%, var(--bg-primary));
            background-color: var(--bg-primary);
            color: var(--text-primary);
            transition: background-color 0.3s ease-in-out, color 0.3s ease-in-out;
        }

        /* Scoped overrides for themed views */
        .focus-mode-overlay[class*="ambiance-"] .focus-mode-title,
        .article-view-wrapper[class*="ambiance-"] .article-title-input {
            background: none;
            -webkit-background-clip: unset;
            -webkit-text-fill-color: unset;
            color: var(--text-primary);
        }

        .article-view-wrapper[class*="ambiance-"] .article-container.ui-card {
            background-color: transparent;
            backdrop-filter: none;
            -webkit-backdrop-filter: none;
            box-shadow: none;
            border: none;
        }

        .sectional-card-body .snippet:has(.nk-text-tile),
        .focus-mode-body .snippet:has(.nk-text-tile) {
            padding: 0;
            background: none;
        }

        /* This rule makes sure the themes apply correctly in all four contexts */
        .focus-mode-overlay[class*="ambiance-"],
        #pdf-viewer-container[class*="ambiance-"],
        .article-view-wrapper[class*="ambiance-"],
        .study-view[class*="ambiance-"],
        .zen-mode-overlay[class*="ambiance-"] {
            --bg-secondary: var(--bg-primary);
            --bg-tertiary: color-mix(in srgb, var(--text-primary) 10%, var(--bg-primary));
            --border-color: color-mix(in srgb, var(--text-primary) 20%, var(--bg-primary));
            background-color: var(--bg-primary);
            color: var(--text-primary);
            transition: background-color 0.4s ease, color 0.4s ease;
        }

        /* Scoped overrides for themed views */
        .focus-mode-overlay[class*="ambiance-"] .focus-mode-title,
        .article-view-wrapper[class*="ambiance-"] .article-title-input {
            background: none;
            -webkit-background-clip: unset;
            -webkit-text-fill-color: unset;
            color: var(--text-primary);
        }

        .article-view-wrapper[class*="ambiance-"] .article-container.ui-card {
            background-color: transparent;
            backdrop-filter: none;
            -webkit-backdrop-filter: none;
            box-shadow: none;
            border: none;
        }



        /* --- H. Vertical Timeline Layout (AESTHETIC REDESIGN) --- */
        .sectional-card-container.is-timeline {
            position: relative;
            padding-left: 5rem;
            /* Space for the timeline decorations */
        }

        /* The central vertical line */
        .sectional-card-container.is-timeline::before {
            content: '';
            position: absolute;
            left: 2.5rem;
            /* Position in the middle of the padding */
            transform: translateX(-50%);
            top: 0;
            bottom: 0;
            width: 4px;
            background-color: var(--border-color);
        }

        .timeline-entry {
            position: relative;
            margin-bottom: 1rem;
            /* Tighter spacing between timeline entries */
            opacity: 0;
            transform: translateY(20px);
            animation: slideUpFadeIn 0.5s ease-out forwards;
        }

        @keyframes slideUpFadeIn {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* The decorative marker dot */
        .timeline-marker {
            position: absolute;
            left: -2.5rem;
            /* RATIONALE: Aligns the center of the marker with the center of the card's title area */
            top: 2rem;
            transform: translate(-50%, -50%);
            width: 55px;
            height: 55px;
            border-radius: 50%;
            background-color: var(--bg-secondary);
            border: 3px solid var(--primary-color);
            z-index: 1;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            box-shadow: var(--shadow);
        }

        /* FIX #3: Hover effect for the marker */
        .timeline-entry:hover .timeline-marker {
            transform: translate(-50%, -50%) scale(1.25);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-color-hover);
        }

        /* FIX #3: Date text styled to be inside the marker */
        .timeline-date {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.1;
        }



        /* --- DEFINITIVE: Classic Bordered Accordion Styles (v2) --- */
        .nk-accordion {
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            margin: 1.5em 0;
            background-color: var(--bg-secondary);
            transition: var(--transition-fast);
            overflow: hidden;
        }

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

        .nk-accordion-trigger {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            width: 100%;
            padding: 1rem 1.25rem;
            background-color: color-mix(in srgb, var(--border-color) 25%, var(--bg-tertiary));
            border: none;
            cursor: pointer;
            font-family: inherit;
            font-size: inherit;
            color: var(--text-primary);
            text-align: left;
        }

        .nk-accordion-trigger:hover {
            background-color: color-mix(in srgb, var(--border-color) 40%, var(--bg-tertiary));
        }

        .nk-accordion-title {
            flex-grow: 1;
            outline: none;
        }

        .nk-accordion-title:empty::before {
            content: attr(data-placeholder);
            color: var(--text-secondary);
            pointer-events: none;
        }

        .nk-accordion-chevron {
            flex-shrink: 0;
            width: 18px;
            height: 18px;
            stroke: currentColor;
            stroke-width: 3;
            stroke-linecap: round;
            stroke-linejoin: round;
            fill: none;
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body.read-mode .nk-accordion-chevron {
            display: none;
            /* Hides chevron in read mode as requested */
        }

        .nk-accordion-content {
            padding: 1rem 1.25rem;
            border-top: 1px solid var(--border-color);
            outline: none;
            transition: max-height 0.4s ease-in-out, opacity 0.3s ease-in-out, padding 0.4s ease-in-out;
        }

        .nk-accordion-content:empty::before {
            content: attr(data-placeholder);
            color: var(--text-secondary);
            pointer-events: none;
        }

        [data-state="closed"]>.nk-accordion-content {
            max-height: 0;
            opacity: 0;
            padding-top: 0;
            padding-bottom: 0;
            border-top-color: transparent;
            overflow: hidden;
        }

        [data-state="open"]>.nk-accordion-content {
            max-height: 1000px;
            opacity: 1;
        }

        [data-state="open"]>.nk-accordion-trigger .nk-accordion-chevron {
            transform: rotate(180deg);
        }

        .nk-accordion-controls {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        body.read-mode .nk-accordion-controls {
            opacity: 0;
            transition: opacity 0.2s ease-in-out;
        }

        body.read-mode .nk-accordion:hover .nk-accordion-controls {
            opacity: 1;
        }

        .nk-accordion-control-btn {
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

        .nk-accordion-control-btn.active {
            background-color: var(--primary-color);
            color: var(--text-on-primary);
        }

        .nk-accordion-hint-editor {
            padding: 0.75rem 1.25rem;
            border-top: 1px solid var(--border-color);
            background-color: var(--bg-primary);
            font-size: 0.9em;
            color: var(--text-secondary);
        }

        .nk-accordion-hint-content {
            outline: none;
        }

        .nk-accordion-hint-content:empty::before {
            content: attr(data-placeholder);
            font-style: italic;
        }

        .study-card-content-box img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin-top: 1rem;
        }

        .flashcard-tile-content img {
            display: block;
            max-height: 60px;
            width: 100%;
            object-fit: contain;
            border-radius: var(--border-radius);
            margin-top: 2px;
        }

        .reversible-indicator {
            font-size: 0.8rem;
            color: var(--primary-color);
            margin-left: 8px;
        }

        .study-hint-container {
            margin-top: 1.5rem;
            font-size: 1rem;
            font-family: var(--font-body);
        }

        .study-hint-content {
            margin-top: 0.5rem;
            padding: 1rem;
            background-color: var(--bg-tertiary);
            border-radius: var(--border-radius);
            color: var(--text-secondary);
            font-style: italic;
            animation: fadeIn 0.3s ease;
        }

        body.read-mode .nk-accordion-controls {
            opacity: 0;
            /* Hide controls by default in read mode */
            transition: opacity 0.2s ease-in-out;
        }

        body.read-mode .nk-accordion:hover .nk-accordion-controls {
            opacity: 1;
            /* Show controls on hover */
        }

        body.study-mode-active header,
        body.study-mode-active #app-background,
        body.study-mode-active main {
            display: none;
        }

        /* ========================================================= */
        /* ZEN MODE — PREMIUM REDESIGN                               */
        /* ========================================================= */

        @keyframes zen-glow-pulse {

            0%,
            100% {
                text-shadow: 0 0 30px color-mix(in srgb, var(--zen-glow-color, var(--primary-color)) 35%, transparent),
                    0 0 60px color-mix(in srgb, var(--zen-glow-color, var(--primary-color)) 15%, transparent),
                    0 2px 10px rgba(0, 0, 0, 0.2);
            }

            50% {
                text-shadow: 0 0 50px color-mix(in srgb, var(--zen-glow-color, var(--primary-color)) 65%, transparent),
                    0 0 110px color-mix(in srgb, var(--zen-glow-color, var(--primary-color)) 30%, transparent),
                    0 2px 10px rgba(0, 0, 0, 0.2);
            }
        }

        .zen-mode-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: var(--bg-primary);
            z-index: 300000 !important;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            animation: fadeIn 0.3s;
            padding: 2.5rem;
            text-align: center;
            transition: background-color 0.4s ease, color 0.4s ease;
        }

        /* Auto-hide bottom controls — fade out by default, reveal on hover */
        .zen-bottom-controls {
            position: absolute;
            bottom: 2rem;
            display: flex;
            align-items: center;
            gap: 1.5rem;
            opacity: 0;
            transition: opacity 0.35s ease;
        }

        .zen-mode-overlay:hover .zen-bottom-controls {
            opacity: 1;
        }

        /* Auto-hide ambiance picker — top-right corner, fades in on hover */
        .zen-ambiance-picker {
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            display: flex;
            align-items: center;
            gap: 8px;
            opacity: 0;
            transition: opacity 0.35s ease;
            flex-wrap: wrap;
            justify-content: flex-end;
            max-width: 420px;
        }

        .zen-mode-overlay:hover .zen-ambiance-picker {
            opacity: 1;
        }

        .progress-comet {
            position: absolute;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            opacity: 0;
            transform: translate(-50%, -50%);
            z-index: 10;
            transition: left 0.1s linear, top 0.1s linear, box-shadow 0.4s ease, background-color 0.4s ease;
            will-change: left, top;
        }

        .zen-timer {
            font-size: clamp(8rem, 20vw, 15rem);
            font-weight: 700;
            line-height: 1;
            animation: zen-glow-pulse 13s ease-in-out infinite;
            transition: color 0.5s ease;
            color: var(--text-primary);
        }

        /* Progress ring with comet */
        .zen-progress-ring-wrapper {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        .zen-progress-ring-svg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }

        .zen-meta-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .zen-pills-row {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        .zen-pills-row>div {
            min-width: 100px;
            text-align: center;
            justify-content: center;
            display: inline-flex;
            align-items: center;
            font-size: 1.05rem;
            padding: 8px 18px;
            border-radius: 50px;
            font-weight: 700;
            background-color: var(--text-primary) !important;
            color: var(--bg-primary) !important;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
            text-transform: capitalize;
            border: 2px solid transparent;
        }

        .zen-task-title {
            font-size: clamp(1.5rem, 3.5vw, 2.2rem);
            margin: 0;
            font-weight: 500;
            transition: color 0.5s ease;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            max-width: 90vw;
            line-height: 1.3;
            color: var(--text-primary);
            white-space: normal;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            margin-top: 1.5rem;
        }

        .zen-progress-frame .progress-segment {
            height: 12px;
            width: 12px;
        }

        .stats-dashboard-view {
            padding: 1.5rem;
            max-width: 1400px;
            margin: 0 auto;
        }

        .stats-header {
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 2rem;
        }

        .stats-header h1 {
            font-family: var(--font-display);
            font-size: 2.5rem;
            margin: 0;
        }

        .stats-section-title {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 2.5rem 0 1rem 0;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 0.5rem;
        }

        .stats-section-title-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
            margin: 2.5rem 0 1rem 0;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 0.5rem;
        }

        .stats-section-title-row .stats-section-title {
            margin: 0;
            padding: 0;
            border: none;
            flex: 1;
            min-width: 0;
        }

        .stats-export-btn {
            opacity: 0.55;
            flex-shrink: 0;
        }

        .stats-export-btn:hover {
            opacity: 1;
        }

        .stats-export-block {
            border-radius: var(--border-radius-lg);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
            gap: 1rem;
        }

        .stat-card {
            background: linear-gradient(to right bottom, var(--bg-secondary), var(--bg-tertiary));
            padding: 1.25rem;
            border-radius: var(--border-radius-lg);
            text-align: center;
            border: 1px solid var(--border-color);
        }

        .stat-card-value {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.2;
            color: var(--primary-color);
        }

        .stat-card-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 0.75rem;
        }

        .category-section-container {
            background-color: var(--bg-primary);
            padding: 0.5rem 1.5rem 1.5rem 1.5rem;
            border-radius: var(--border-radius-lg);
            margin-top: 1rem;
        }

        .category-grid .category-card {
            padding: 0.85rem 1.15rem;
        }

        .category-grid .category-pill {
            padding: 6px 12px;
            font-size: 0.9rem;
        }

        .category-card {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--bg-secondary);
            padding: 1rem 1.25rem;
            border-radius: var(--border-radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition-fast);
        }

        .category-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

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

        .category-card-value {
            font-size: 1.1rem;
            font-weight: 600;
        }

        .heatmap-container {
            padding: 1rem;
            background-color: var(--bg-secondary);
            border-radius: var(--border-radius-lg);
            margin-top: 1rem;
        }

        .heatmap-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
            font-weight: 600;
            font-size: 1.1rem;
        }

        .heatmap-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 4px;
        }

        .heatmap-day {
            width: 100%;
            aspect-ratio: 1;
            background-color: var(--heat-0);
            border-radius: 4px;
            transition: transform 0.2s;
            cursor: pointer;
        }

        .heatmap-day.empty {
            background-color: transparent;
            border: 1px dashed var(--border-color);
            cursor: default;
        }

        .heatmap-day:not(.empty):hover {
            transform: scale(1.1);
        }

        .heatmap-day.level-1 {
            background-color: var(--heat-1);
        }

        .heatmap-day.level-2 {
            background-color: var(--heat-2);
        }

        .heatmap-day.level-3 {
            background-color: var(--heat-3);
        }

        .heatmap-day.level-4 {
            background-color: var(--heat-4);
        }

        .heatmap-day.level-5 {
            background-color: var(--heat-5);
        }

        .heatmap-day.level-6 {
            background-color: var(--heat-6);
        }

        .heatmap-day.level-7 {
            background-color: var(--heat-7);
        }

        .quiz-result-card {
            max-width: 450px;
            text-align: center;
        }

        .quiz-score-display {
            font-size: 4rem;
            font-weight: 700;
            margin: 1.5rem 0;
            background: linear-gradient(45deg, var(--primary-color), var(--primary-color-hover));
            background-clip: text;
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .quiz-motivational-quote {
            font-size: 1.2rem;
            font-style: italic;
            color: var(--text-secondary);
        }

        .btn-quiz {
            border: 1px solid transparent;
            transition: all 0.2s ease-in-out;
        }

        .btn-quiz:hover:not(:disabled) {
            border-color: var(--primary-color);
            box-shadow: 0 0 8px 1px color-mix(in srgb, var(--primary-color) 40%, transparent);
        }

        .quiz-stats-container {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            align-items: center;
        }

        .streak-container {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 1.5rem;
            flex-wrap: wrap;
            width: 100%;
        }

        .streak-display.daily {
            width: clamp(130px, 15vw, 160px);
            height: clamp(130px, 15vw, 160px);
            border-radius: 50%;
            background: var(--bg-secondary);
            border: 5px solid var(--primary-color);
            /* Simplified */
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1), inset 0 3px 8px rgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 1rem;
            cursor: default;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }

        .streak-display.daily:hover {
            transform: translateY(-5px) scale(1.05);
        }

        .streak-value {
            font-size: clamp(2.8rem, 8vw, 4rem);
            font-weight: 700;
            line-height: 1;
            color: var(--primary-color);
            /* Simplified */
            text-shadow: 0 2px 3px rgba(0, 0, 0, 0.2);
        }

        .streak-label {
            font-size: clamp(0.7rem, 2vw, 0.8rem);
            font-weight: 600;
            color: var(--text-secondary);
            margin-top: 0.25rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .weekly-streak-calendar {
            display: flex;
            align-items: center;
            justify-content: space-around;
            background-color: var(--bg-tertiary);
            border-radius: var(--border-radius-lg);
            padding: clamp(0.5rem, 2vw, 0.75rem);
            height: clamp(110px, 15vw, 140px);
            flex-grow: 1;
            max-width: clamp(320px, 40vw, 450px);
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
            border: 2px solid var(--primary-color);
            transition: all 0.3s ease;
        }

        .week-day {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: clamp(34px, 5.5vw, 50px);
            gap: 0.25rem;
        }

        .day-letter {
            font-size: clamp(0.7rem, 1.5vw, 0.85rem);
            font-weight: 600;
            color: var(--text-secondary);
        }

        .date-number {
            font-weight: 700;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            transition: all 0.2s ease-in-out;
            font-size: clamp(1.1rem, 2.5vw, 1.4rem);
            width: clamp(32px, 5vw, 42px);
            height: clamp(32px, 5vw, 42px);
        }

        .week-day.today .date-number {
            box-shadow: 0 0 0 2px var(--primary-color);
        }

        .week-day.completed .date-number {
            background-color: var(--primary-color);
            color: var(--text-on-primary, #fff);
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
        }


        .sub-stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            gap: 1rem;
            width: 100%;
        }

        .stat-card-value {
            font-size: clamp(1.2rem, 3.5vw, 2rem);
            word-break: break-all;
        }

        @media (max-width: 612px) {
            .streak-container {
                flex-direction: column;
                gap: 1.5rem;
            }

            .weekly-streak-calendar {
                width: 100%;
                max-width: none;
                height: auto;
                padding: 0.5rem;
            }
        }



        @media (max-width: 640px) {
            .stats-dashboard-view {
                padding: 1rem;
            }

            .stats-header h1 {
                font-size: 2rem;
            }
        }

        .custom-checkbox-container {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 20px;
            height: 20px;
            cursor: pointer;
        }

        .custom-checkbox-container input {
            position: absolute;
            opacity: 0;
            cursor: pointer;
            height: 0;
            width: 0;
        }

        .custom-checkbox {
            position: absolute;
            top: 0;
            left: 0;
            height: 20px;
            width: 20px;
            background-color: transparent;
            border: 2px solid var(--border-color);
            border-radius: 50%;
            transition: all 0.3s ease-in-out;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 0 rgba(255, 255, 255, 0.1);
        }

        .custom-checkbox-container:hover .custom-checkbox {
            border-color: var(--primary-color);
        }

        .custom-checkbox-container input:checked~.custom-checkbox {
            background-color: var(--success-color);
            border-color: var(--success-color);
        }

        .custom-checkbox-container input:checked~.custom-checkbox .check-icon {
            opacity: 1;
            transform: scale(1);
        }

        .task-item.is-backlog:not(.completed) .custom-checkbox {
            background-color: var(--danger-color);
            border-color: var(--danger-color);
        }

        .task-item.is-backlog:not(.completed) .custom-checkbox .cross-icon {
            opacity: 1;
            transform: scale(1);
            color: white;
        }

        .task-item.is-backlog.completed .custom-checkbox {
            background-color: var(--success-color);
            border-color: var(--success-color);
        }

        .task-item.is-backlog.completed .custom-checkbox .cross-icon {
            opacity: 0;
        }



        /* --- Canvas Focus Mode (Line Button) --- */
        .canvas-focus-line {
            width: 100%;
            height: 5.5px;
            background-color: var(--border-color);
            border-radius: 3px;
            cursor: pointer;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }

        .canvas-focus-line:hover {
            background-color: var(--primary-color);
            height: 8px;
        }

        /* When focus mode is active */
        body.canvas-focus-mode header,
        body.canvas-focus-mode #visual-map-controls,
        body.canvas-focus-mode #mindmap-controls {
            display: none;
        }

        body.canvas-focus-mode #visual-map-view.active,
        body.canvas-focus-mode #mindmap-view.active {
            padding: 0;
            gap: 0;
        }

        body.canvas-focus-mode .canvas-focus-line {
            position: absolute;
            top: 0;
            left: 0;
            z-index: 20;
            border-radius: 0;
        }