::-webkit-scrollbar {
            width: 10px;
        }

        ::-webkit-scrollbar-track {
            background: transparent;
        }

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

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

        :root.zero-opacity-active[data-theme="light"] .modal-backdrop .ui-card,
        :root.zero-opacity-active[data-theme="sepia"] .modal-backdrop .ui-card {
            --text-primary: #f8f9fa;
            --text-secondary: #adb5bd;
            --border-color: #495057;
            --primary-color: #79B8FF;
        }

        :root.zero-opacity-active[data-theme="light"] .modal-backdrop .ui-card .text-input,
        :root.zero-opacity-active[data-theme="sepia"] .modal-backdrop .ui-card .text-input {
            background-color: rgba(0, 0, 0, 0.2);
            border-color: var(--border-color);
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

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

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateX(-50%) translateY(5px);
            }

            to {
                opacity: 1;
                transform: translateX(-50%) translateY(0);
            }
        }

        @keyframes growInFromCenter {
            from {
                opacity: 0;
                transform: scale(0.95);
            }

            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        @keyframes slideOutRight {
            from {
                opacity: 1;
                transform: translateX(0);
            }

            to {
                opacity: 0.5;
                transform: translateX(40px);
            }
        }

        .task-item.exiting {
            animation: slideOutRight 0.4s ease-out forwards;
        }

        @keyframes confetti-blast {
            0% {
                opacity: 1;
                transform: translateY(0) rotate(0deg);
            }

            100% {
                opacity: 0;
                transform: translateY(100px) rotate(360deg);
            }
        }

        @keyframes spin {
            from {
                transform: rotate(0deg);
            }

            to {
                transform: rotate(360deg);
            }
        }

        .spin {
            animation: spin 1s linear infinite;
        }

        #app-background {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            z-index: -1;
            background-size: cover;
            background-position: center;
            transition: background-image 0.5s ease-in-out;
        }

        body.image-theme-active {
            --bg-primary: transparent;
        }

        .ui-card {
            background-color: rgba(var(--bg-secondary-rgb), var(--ui-opacity));
            backdrop-filter: blur(var(--blur-intensity));
            -webkit-backdrop-filter: blur(var(--blur-intensity));
            transition: background-color 0.2s, backdrop-filter 0.2s;
            border-radius: var(--border-radius);
        }

        #the-line-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            z-index: 10000;
            background-color: var(--bg-tertiary);
        }

        #the-line {
            width: 100%;
            height: 100%;
            background-color: var(--primary-color);
            transform-origin: left;
            transform: scaleX(0);
            transition: transform 0.2s linear;
        }

        * {
            box-sizing: border-box;
        }

        [data-theme="light"] #the-line {
            background: linear-gradient(90deg, #FF8C42 0%, #FFD05A 35%, #00A896 55%, #A2E869 75%, #05A387 100%);
        }

        [data-theme="dark"] #the-line {
            background: linear-gradient(90deg, #E0B453 0%, #E6845E 50%, #C159A1 100%);
        }

        [data-theme="sepia"] #the-line {
            background: linear-gradient(90deg, #8c6d46 0%, #C2A582 50%, #704214 100%);
        }


        html {
            scroll-behavior: smooth;
        }

        .view.active {
            padding: 1rem;
        }

        #welcome-view.active,
        #article-view.active,
        #visual-map-view.active,
        #mindmap-view.active {
            padding: 0;
        }

        .article-grid {
            gap: calc(var(--spacing-unit) * 2.5);
        }

        .container {
            max-width: 100%;
            margin: 0 auto;
            padding: calc(var(--spacing-unit) * 4);
        }

        .view {
            display: none;
        }

        .view.active {
            display: block;
            animation: fadeIn 0.3s ease-in-out;
        }

        .header-main-actions,
        .header-overflow-actions,
        .header-fixed-actions {
            display: flex;
            align-items: center;
            gap: 6px;
        }


/* --- CRITICAL SPLASH SCREEN LOADER STYLES (LOADED EARLY) --- */
/* Extracted from NoteKash v8.248c.html */
/* === AURORA BACKGROUND === */
            #nk-shell-loader::before {
                content: '';
                position: absolute;
                inset: 0;
                background:
                    radial-gradient(ellipse 80% 60% at 20% 20%, rgba(212, 163, 115, 0.15) 0%, transparent 70%),
                    radial-gradient(ellipse 70% 50% at 80% 80%, rgba(156, 102, 68, 0.12) 0%, transparent 65%),
                    radial-gradient(ellipse 60% 70% at 60% 10%, rgba(250, 237, 205, 0.08) 0%, transparent 60%);
                animation: nk-aurora-drift 8s ease-in-out infinite alternate;
                pointer-events: none;
            }

            @keyframes nk-aurora-drift {
                0% {
                    opacity: 0.7;
                    transform: scale(1) rotate(0deg);
                }

                100% {
                    opacity: 1;
                    transform: scale(1.06) rotate(2deg);
                }
            }

            /* === GLASS CARD === */
            .nk-loader-card {
                position: relative;
                display: flex;
                flex-direction: column;
                align-items: center;
                width: 90%;
                max-width: 420px;
                padding: 48px 40px 40px;
                border-radius: 28px;
                background: rgba(212, 163, 115, 0.03);
                border: 1px solid rgba(212, 163, 115, 0.12);
                box-shadow:
                    0 0 0 1px rgba(212, 163, 115, 0.03),
                    0 32px 64px rgba(0, 0, 0, 0.45),
                    inset 0 1px 0 rgba(250, 237, 205, 0.08);
                backdrop-filter: blur(24px);
                -webkit-backdrop-filter: blur(24px);
                animation: nk-card-in 1.0s cubic-bezier(0.16, 1, 0.3, 1) forwards;
                opacity: 0;
                box-sizing: border-box;
                text-align: center;
            }

            @keyframes nk-card-in {
                0% {
                    opacity: 0;
                    transform: translateY(20px) scale(0.96);
                }

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

            /* === BOOK ICON === */
            .nk-loader-book {
                width: 64px;
                height: 46px;
                position: relative;
                margin-bottom: 32px;
                perspective: 600px;
                transform-style: preserve-3d;
                animation: nk-book-float 3.5s ease-in-out 3.1s infinite;
                filter: drop-shadow(0 4px 18px rgba(156, 102, 68, 0.35));
            }

            .nk-loader-book::before,
            .nk-loader-book::after {
                content: '';
                position: absolute;
                top: 0;
                width: 50%;
                height: 100%;
                border-radius: 2px;
                box-shadow: inset 2px 0 0 rgba(255, 255, 255, 0.15), 0 10px 20px rgba(0, 0, 0, 0.4);
                box-sizing: border-box;
            }

            /* Left cover */
            .nk-loader-book::before {
                left: 0;
                border-radius: 4px 0 0 4px;
                transform-origin: right;
                background: linear-gradient(135deg, #b07d62 0%, #d4a373 100%);
                border: 1px solid rgba(176, 125, 98, 0.6);
                animation: nk-book-open-left 2.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
            }

            /* Right cover */
            .nk-loader-book::after {
                right: 0;
                border-radius: 0 4px 4px 0;
                transform-origin: left;
                background: linear-gradient(-135deg, #9c6644 0%, #b07d62 100%);
                border: 1px solid rgba(156, 102, 68, 0.6);
                animation: nk-book-open-right 2.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
            }

            /* Pages spread */
            .nk-loader-pages {
                position: absolute;
                top: 3px;
                bottom: 3px;
                left: 50%;
                transform: translateX(-50%);
                width: 94%;
                z-index: 2;
                perspective: 600px;
                display: flex;
                justify-content: center;
            }

            .nk-loader-pages::before,
            .nk-loader-pages::after {
                content: '';
                width: 48%;
                height: 100%;
                background: linear-gradient(180deg, #fefae0 0%, #faedcd 100%);
                box-sizing: border-box;
                border: 1px solid rgba(212, 163, 115, 0.4);
            }

            .nk-loader-pages::before {
                border-radius: 2px 0 0 2px;
                transform-origin: right;
                animation: nk-pages-left 2.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
                box-shadow: inset -1px 0 3px rgba(156, 102, 68, 0.2);
            }

            .nk-loader-pages::after {
                border-radius: 0 2px 2px 0;
                transform-origin: left;
                animation: nk-pages-right 2.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
                box-shadow: inset 1px 0 3px rgba(156, 102, 68, 0.2);
            }

            @keyframes nk-book-open-left {
                0% {
                    transform: rotateY(0deg);
                }

                100% {
                    transform: rotateY(-25deg);
                }
            }

            @keyframes nk-book-open-right {
                0% {
                    transform: rotateY(0deg);
                }

                100% {
                    transform: rotateY(25deg);
                }
            }

            @keyframes nk-pages-left {
                0% {
                    transform: rotateY(0deg) scaleX(0.1);
                    opacity: 0;
                }

                100% {
                    transform: rotateY(-20deg) scaleX(1);
                    opacity: 1;
                }
            }

            @keyframes nk-pages-right {
                0% {
                    transform: rotateY(0deg) scaleX(0.1);
                    opacity: 0;
                }

                100% {
                    transform: rotateY(20deg) scaleX(1);
                    opacity: 1;
                }
            }

            @keyframes nk-book-float {

                0%,
                100% {
                    transform: translateY(0);
                }

                50% {
                    transform: translateY(-6px);
                }
            }

            /* === TYPOGRAPHY === */
            #nk-shell-loader h1 {
                font-family: 'Montserrat', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
                font-size: min(2.2rem, 8vw);
                font-weight: 700;
                letter-spacing: 0.22em;
                margin: 0;
                text-transform: uppercase;
                background: linear-gradient(135deg, #fefae0 30%, #e9ceb3 70%, #d4a373 100%);
                background-clip: text;
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                background-clip: text;
                opacity: 0;
                transform: translateY(8px);
                animation: nk-title-reveal 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards 0.4s;
            }

            #nk-shell-loader .nk-loader-sub {
                font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
                font-weight: 400;
                font-size: min(0.78rem, 3.5vw);
                letter-spacing: 0.26em;
                text-transform: uppercase;
                color: rgba(212, 163, 115, 0.75);
                margin-top: 6px;
                opacity: 0;
                animation: nk-sub-reveal 1.4s cubic-bezier(0.16, 1, 0.3, 1) forwards 0.65s;
            }

            @keyframes nk-title-reveal {
                to {
                    opacity: 1;
                    transform: translateY(0);
                    letter-spacing: 0.28em;
                }
            }

            @keyframes nk-sub-reveal {
                to {
                    opacity: 1;
                }
            }

            /* === DIVIDER === */
            .nk-loader-divider {
                width: 48px;
                height: 1px;
                background: linear-gradient(90deg, transparent, rgba(212, 163, 115, 0.5), transparent);
                margin: 24px auto 20px;
                opacity: 0;
                animation: nk-sub-reveal 1s ease forwards 1.0s;
            }

            /* === STATUS ROW === */
            .nk-loader-status {
                display: flex;
                align-items: center;
                justify-content: center;
                flex-wrap: wrap;
                gap: 10px;
                opacity: 0;
                animation: nk-sub-reveal 0.8s ease forwards 1.1s;
            }

            .nk-loader-status-label {
                font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
                font-size: 0.78rem;
                font-weight: 400;
                letter-spacing: 0.06em;
                color: rgba(235, 215, 195, 0.6);
                white-space: nowrap;
            }

            /* Travel-dot track - Hardware accelerated GPU compositor layers */
            .nk-travel-dots {
                display: flex;
                gap: 6px;
                align-items: center;
            }

            .nk-travel-dots span {
                width: 6px;
                height: 6px;
                border-radius: 50%;
                background: #d4a373;
                opacity: 0.3;
                transform: scale(0.75) translateZ(0);
                will-change: transform, opacity;
                animation: nk-travel 1.5s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
            }

            .nk-travel-dots span:nth-child(1) {
                animation-delay: 0.0s;
            }

            .nk-travel-dots span:nth-child(2) {
                animation-delay: 0.18s;
            }

            .nk-travel-dots span:nth-child(3) {
                animation-delay: 0.36s;
            }

            .nk-travel-dots span:nth-child(4) {
                animation-delay: 0.54s;
            }

            .nk-travel-dots span:nth-child(5) {
                animation-delay: 0.72s;
            }

            @keyframes nk-travel {
                0%,
                100% {
                    opacity: 0.22;
                    transform: scale(0.7) translateZ(0);
                }

                35% {
                    opacity: 1;
                    transform: scale(1.35) translateZ(0);
                }

                65% {
                    opacity: 0.35;
                    transform: scale(0.85) translateZ(0);
                }
            }

            /* === BUTTERY SMOOTH VIEW TRANSITION OVERLAY === */
            #nk-view-transition-overlay {
                position: fixed;
                inset: 0;
                pointer-events: none;
                z-index: 999999;
                opacity: 0;
                backdrop-filter: blur(0px);
                -webkit-backdrop-filter: blur(0px);
                background: rgba(var(--bg-primary-rgb, 24, 20, 17), 0.15);
                transition: opacity 0.14s cubic-bezier(0.16, 1, 0.3, 1), backdrop-filter 0.14s ease, -webkit-backdrop-filter 0.14s ease;
                will-change: opacity, backdrop-filter;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            #nk-view-transition-overlay.transition-active {
                opacity: 1;
                backdrop-filter: blur(4px);
                -webkit-backdrop-filter: blur(4px);
            }

            .nk-transition-spinner {
                width: 24px;
                height: 24px;
                border: 2px solid rgba(212, 163, 115, 0.2);
                border-top-color: var(--primary-color, #d4a373);
                border-radius: 50%;
                animation: nk-spin-fast 0.6s linear infinite;
                animation-play-state: paused;
                will-change: transform;
                opacity: 0;
                transform: scale(0.8) translateZ(0);
                transition: opacity 0.12s ease, transform 0.12s ease;
            }

            #nk-view-transition-overlay.transition-active .nk-transition-spinner {
                opacity: 0.85;
                animation-play-state: running;
                transform: scale(1) translateZ(0);
            }

            @keyframes nk-spin-fast {
                to {
                    transform: rotate(360deg) translateZ(0);
                }
            }

            /* === RESPONSIVE === */
            @media (max-width: 480px) {
                .nk-loader-card {
                    padding: 36px 24px 32px;
                }

                #nk-shell-loader h1 {
                    font-size: 1.8rem;
                    letter-spacing: 0.18em;
                }

                @keyframes nk-title-reveal {
                    to {
                        opacity: 1;
                        transform: translateY(0);
                        letter-spacing: 0.22em;
                    }
                }

                .nk-loader-status {
                    flex-direction: column;
                    gap: 12px;
                }
            }