/* ========================================
           DESIGN SYSTEM: Tufte + Prezi Hybrid
           ======================================== */

        :root {
            /* Tufte Color Palette - Preserved */
            --paper: #FDFBF7;
            --ink: #2C2C2C;
            --ink-light: #555555;
            --accent-teal: #4A6C6F;
            --accent-alert: #C0504D;
            --data-grey: #708090;
            --grid-line: #D8D4CC;
            --note-bg: #F5F3ED;
            --border-subtle: #CCC8C0;
            --canvas-bg: #F0EDE6;

            /* Typography - Distinctive */
            --font-display: 'Fraunces', Georgia, serif;
            --font-body: 'Source Serif 4', Georgia, serif;
            --font-mono: 'JetBrains Mono', monospace;
            --font-ui: system-ui, -apple-system, sans-serif;

            /* Spacing */
            --space-xs: 0.25rem;
            --space-sm: 0.5rem;
            --space-md: 1rem;
            --space-lg: 2rem;
            --space-xl: 4rem;
            --space-2xl: 8rem;

            /* Animation */
            --transition-slow: 800ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-med: 400ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-fast: 200ms ease-out;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            font-size: 18px;
            -webkit-font-smoothing: antialiased;
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-body);
            background: var(--canvas-bg);
            color: var(--ink);
            line-height: 1.7;
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* ========================================
           CANVAS: The Prezi-like Container
           ======================================== */

        .canvas {
            position: relative;
            width: 100%;
            transition: transform var(--transition-slow);
        }

        /* ========================================
           PRESENTATION MODE
           ======================================== */

        body.mode-presentation .canvas {
            position: fixed;
            inset: 0;
            overflow: hidden;
        }

        body.mode-presentation .frame {
            position: fixed;
            inset: 0;
            display: none;
            align-items: safe center;
            justify-content: center;
            padding: var(--space-xl);
            background: var(--paper);
            opacity: 0;
            transform: scale(0.9);
            transition: opacity var(--transition-med), transform var(--transition-med);
            overflow-y: auto;
        }

        body.mode-presentation .frame.active {
            display: flex;
            opacity: 1;
            transform: scale(1);
        }

        body.mode-presentation .frame.zoom-in {
            animation: zoomIn var(--transition-slow) forwards;
        }

        body.mode-presentation .frame.zoom-out {
            animation: zoomOut var(--transition-slow) forwards;
        }

        @keyframes zoomIn {
            from { opacity: 0; transform: scale(1.3); }
            to { opacity: 1; transform: scale(1); }
        }

        @keyframes zoomOut {
            from { opacity: 1; transform: scale(1); }
            to { opacity: 0; transform: scale(0.7); }
        }

        /* ========================================
           DOCUMENT MODE (Default)
           ======================================== */

        body.mode-document .canvas {
            max-width: 1000px;
            margin: 0 auto;
            padding: var(--space-xl) var(--space-lg);
        }

        body.mode-document .frame {
            /* Skip layout+paint for off-screen frames until they scroll into
               view. Reduces initial paint cost on the 9 below-fold frames.
               The intrinsic-size hint reserves layout space so CLS stays at
               0 and scrollbars size correctly before off-screen frames render.
               Confirmed in testing: this does NOT cause the page's NO_LCP
               condition — that's pre-existing and structural. */
            content-visibility: auto;
            contain-intrinsic-size: auto 100vh;
            background: var(--paper);
            padding: var(--space-2xl) var(--space-xl);
            margin-bottom: var(--space-xl);
            border-radius: 8px;
            box-shadow: 0 4px 24px rgba(0,0,0,0.06);
            min-height: 80vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        body.mode-document .frame-content {
            max-width: 800px;
            margin: 0 auto;
            width: 100%;
        }

        body.mode-document .frame.title-frame {
            min-height: 100vh;
            text-align: left;
        }

        body.mode-document .deep-dive {
            display: block !important;
            text-align: left;
        }

        body.mode-document .deep-dive p,
        body.mode-document .deep-dive li {
            max-width: none;
        }

        body.mode-document .nav-ui {
            display: flex;
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(8px);
        }

        /* ========================================
           TYPOGRAPHY
           ======================================== */

        .kicker {
            font-family: var(--font-ui);
            font-size: 0.7rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.15em;
            color: var(--accent-teal);
            margin-bottom: var(--space-sm);
            opacity: 0.9;
        }

        h1 {
            font-family: var(--font-display);
            font-size: clamp(2.5rem, 6vw, 4rem);
            font-weight: 300;
            line-height: 1.1;
            margin-bottom: var(--space-lg);
            letter-spacing: -0.02em;
        }

        h1 strong {
            font-weight: 600;
            color: var(--accent-teal);
        }

        h2 {
            font-family: var(--font-display);
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 400;
            line-height: 1.3;
            margin-bottom: var(--space-md);
            margin-top: var(--space-xl);
        }

        h3 {
            font-family: var(--font-ui);
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.12em;
            color: var(--data-grey);
            margin-bottom: var(--space-sm);
            margin-top: var(--space-lg);
        }

        .lede {
            font-size: 1.35rem;
            font-weight: 300;
            color: var(--ink-light);
            line-height: 1.6;
            max-width: 45ch;
        }

        body.mode-presentation .lede {
            margin: 0 auto;
            text-align: left;
        }

        p {
            margin-bottom: var(--space-md);
            max-width: 65ch;
        }

        body.mode-presentation p {
            margin-left: auto;
            margin-right: auto;
        }

        blockquote {
            font-family: var(--font-display);
            font-style: italic;
            font-size: 1.5rem;
            font-weight: 300;
            line-height: 1.5;
            color: var(--ink);
            border-left: 3px solid var(--accent-teal);
            padding-left: var(--space-lg);
            margin: var(--space-xl) 0;
            max-width: 50ch;
        }

        body.mode-presentation blockquote {
            margin-left: auto;
            margin-right: auto;
            text-align: left;
        }

        blockquote strong {
            color: var(--accent-teal);
            font-style: normal;
            font-weight: 600;
        }

        code {
            font-family: var(--font-mono);
            font-size: 0.85em;
            background: var(--note-bg);
            padding: 0.15em 0.4em;
            border-radius: 4px;
            border: 1px solid var(--border-subtle);
        }

        pre {
            font-family: var(--font-mono);
            font-size: 0.8rem;
            background: var(--note-bg);
            padding: var(--space-lg);
            border-radius: 6px;
            border: 1px solid var(--border-subtle);
            overflow-x: auto;
            line-height: 1.6;
            margin: var(--space-lg) 0;
        }

        /* ========================================
           DATA DISPLAYS
           ======================================== */

        .big-number {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .big-number .value {
            font-family: var(--font-display);
            font-size: clamp(4rem, 12vw, 8rem);
            font-weight: 300;
            line-height: 1;
            color: var(--accent-teal);
            letter-spacing: -0.03em;
        }

        .big-number .label {
            font-family: var(--font-ui);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--data-grey);
            margin-top: var(--space-sm);
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }

        .stat-row {
            display: flex;
            justify-content: center;
            gap: var(--space-xl);
            flex-wrap: wrap;
            margin: var(--space-xl) 0;
        }

        .stat {
            text-align: center;
        }

        .stat .value {
            font-family: var(--font-display);
            font-size: 2.5rem;
            font-weight: 400;
            color: var(--ink);
            line-height: 1;
        }

        .stat .label {
            font-size: 0.8rem;
            color: var(--data-grey);
            margin-top: var(--space-xs);
        }

        /* Tables */
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
            margin: var(--space-lg) 0;
        }

        table th {
            font-family: var(--font-ui);
            font-weight: 600;
            text-align: left;
            padding: var(--space-sm) var(--space-md);
            border-bottom: 2px solid var(--ink);
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--data-grey);
        }

        table td {
            padding: var(--space-sm) var(--space-md);
            border-bottom: 1px solid var(--grid-line);
            vertical-align: top;
        }

        table tr:last-child td {
            border-bottom: none;
        }

        /* ========================================
           VISUALIZATIONS
           ======================================== */

        .sparkline-container {
            margin: var(--space-xl) auto;
            max-width: 700px;
        }

        .sparkline-container svg {
            width: 100%;
            height: auto;
        }

        .bar-chart {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
            max-width: 500px;
            margin: var(--space-lg) auto;
        }

        .bar-row {
            display: grid;
            grid-template-columns: 120px 1fr 70px;
            align-items: center;
            gap: var(--space-md);
        }

        .bar-label {
            font-family: var(--font-mono);
            font-size: 0.75rem;
            color: var(--ink);
            text-align: right;
        }

        .bar-track {
            height: 24px;
            background: var(--grid-line);
            border-radius: 4px;
            overflow: hidden;
            position: relative;
        }

        .bar-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--accent-teal) 0%, #5a7c7f 100%);
            border-radius: 4px;
            transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .bar-value {
            font-family: var(--font-mono);
            font-size: 0.8rem;
            color: var(--data-grey);
        }

        /* Duration histogram */
        .histogram {
            font-family: var(--font-mono);
            font-size: 0.8rem;
            line-height: 1.8;
            margin: var(--space-lg) 0;
        }

        .histogram .bar {
            color: var(--accent-teal);
        }

        .histogram .peak {
            color: var(--accent-alert);
            font-weight: 600;
        }

        /* ========================================
           LAYOUT COMPONENTS
           ======================================== */

        .two-col {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--space-xl);
            margin: var(--space-lg) 0;
        }

        .card {
            background: var(--paper);
            padding: var(--space-lg);
            border-radius: 6px;
            border-left: 4px solid var(--accent-teal);
        }

        .card.alert {
            border-left-color: var(--accent-alert);
        }

        .card h4 {
            font-family: var(--font-ui);
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: var(--space-sm);
            color: var(--accent-teal);
        }

        .card.alert h4 {
            color: var(--accent-alert);
        }

        .pillars-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-lg);
            margin: var(--space-xl) 0;
        }

        .pillar {
            padding: var(--space-lg);
            border-left: 4px solid var(--accent-teal);
        }

        .pillar h4 {
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: var(--space-sm);
        }

        .pillar .evidence {
            font-family: var(--font-mono);
            font-size: 0.75rem;
            color: var(--accent-teal);
            margin-top: var(--space-sm);
        }

        /* Level cards */
        .levels {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
            margin: var(--space-lg) 0;
        }

        .level {
            display: grid;
            grid-template-columns: 80px 1fr;
            gap: var(--space-lg);
            padding: var(--space-lg);
            background: var(--note-bg);
            border-radius: 6px;
            transition: all var(--transition-fast);
        }

        .level.highlight {
            background: rgba(74, 108, 111, 0.1);
            border: 2px solid var(--accent-teal);
        }

        .level-num {
            font-family: var(--font-display);
            font-size: 2.5rem;
            font-weight: 300;
            color: var(--data-grey);
            line-height: 1;
        }

        .level.highlight .level-num {
            color: var(--accent-teal);
        }

        .level-content h4 {
            font-family: var(--font-ui);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: var(--space-xs);
        }

        .level-content p {
            font-size: 0.9rem;
            color: var(--ink-light);
            margin: 0;
        }

        /* Flow diagram */
        .flow {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-sm);
            flex-wrap: wrap;
            margin: var(--space-lg) 0;
        }

        .flow-step {
            background: var(--note-bg);
            padding: var(--space-sm) var(--space-md);
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 500;
        }

        .flow-step.highlight {
            background: var(--accent-teal);
            color: white;
        }

        .flow-arrow {
            color: var(--data-grey);
            font-size: 1.25rem;
        }

        /* Stack diagram */
        .stack {
            display: flex;
            flex-direction: column;
            gap: 2px;
            max-width: 550px;
            margin: var(--space-lg) auto;
        }

        .stack-layer {
            background: var(--note-bg);
            padding: var(--space-md) var(--space-lg);
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-left: 4px solid var(--data-grey);
        }

        .stack-layer:first-child {
            border-radius: 6px 6px 0 0;
        }

        .stack-layer:last-child {
            border-radius: 0 0 6px 6px;
        }

        .stack-layer .name {
            font-weight: 600;
            font-size: 0.9rem;
        }

        .stack-layer .detail {
            font-family: var(--font-mono);
            font-size: 0.75rem;
            color: var(--data-grey);
        }

        /* Highlight boxes */
        .highlight-box {
            background: rgba(74, 108, 111, 0.08);
            border: 1px solid var(--accent-teal);
            padding: var(--space-lg);
            border-radius: 6px;
            margin: var(--space-lg) 0;
            text-align: center;
        }

        .alert-box {
            background: rgba(192, 80, 77, 0.08);
            border: 1px solid var(--accent-alert);
            padding: var(--space-lg);
            border-radius: 6px;
            margin: var(--space-lg) 0;
        }

        /* ========================================
           DEEP DIVE SECTIONS (Document Mode Only)
           ======================================== */

        .deep-dive {
            display: none;
            margin-top: var(--space-xl);
            padding-top: var(--space-xl);
            border-top: 1px solid var(--grid-line);
        }

        .deep-dive h3:first-child {
            margin-top: 0;
        }

        /* ========================================
           NAVIGATION UI
           ======================================== */

        .nav-ui {
            position: fixed;
            bottom: var(--space-lg);
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            align-items: center;
            gap: var(--space-lg);
            font-family: var(--font-ui);
            font-size: 0.75rem;
            color: var(--data-grey);
            z-index: 1000;
            background: rgba(253, 251, 247, 0.95);
            backdrop-filter: blur(10px);
            padding: var(--space-sm) var(--space-lg);
            border-radius: 100px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        }

        .nav-btn {
            background: none;
            border: none;
            padding: var(--space-xs) var(--space-sm);
            cursor: pointer;
            color: var(--data-grey);
            font-size: 1.25rem;
            transition: color var(--transition-fast);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-btn:hover {
            color: var(--accent-teal);
        }

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

        .slide-counter {
            font-family: var(--font-mono);
            font-size: 0.8rem;
            min-width: 70px;
            text-align: center;
            white-space: nowrap;
        }

        .progress-bar {
            width: 120px;
            height: 3px;
            background: var(--grid-line);
            border-radius: 2px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: var(--accent-teal);
            transition: width var(--transition-med);
        }

        .mode-toggle {
            font-family: var(--font-ui);
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            padding: var(--space-xs) var(--space-sm);
            border: 1px solid var(--border-subtle);
            background: transparent;
            border-radius: 4px;
            cursor: pointer;
            color: var(--data-grey);
            transition: all var(--transition-fast);
        }

        .mode-toggle:hover {
            background: var(--accent-teal);
            color: white;
            border-color: var(--accent-teal);
        }

        .help-hint {
            opacity: 0.6;
            font-size: 0.7rem;
        }

        /* ========================================
           APPENDIX STYLING
           ======================================== */

        .frame.appendix {
            background: var(--note-bg);
        }

        .frame.appendix .kicker {
            color: var(--accent-alert);
        }

        /* ========================================
           LISTS
           ======================================== */

        ul, ol {
            margin: var(--space-md) 0;
            padding-left: var(--space-lg);
        }

        li {
            margin-bottom: var(--space-sm);
        }

        .checklist {
            list-style: none;
            padding-left: 0;
        }

        .checklist li {
            padding-left: var(--space-lg);
            position: relative;
        }

        .checklist li::before {
            content: "□";
            position: absolute;
            left: 0;
            color: var(--accent-teal);
            font-size: 1.1em;
        }

        /* ========================================
           RESPONSIVE
           ======================================== */

        @media (max-width: 768px) {
            html {
                font-size: 16px;
            }

            .pillars-grid {
                grid-template-columns: 1fr;
            }

            .two-col {
                grid-template-columns: 1fr;
            }

            .bar-row {
                grid-template-columns: 80px 1fr 50px;
            }

            .stat-row {
                gap: var(--space-lg);
            }

            /* --- Presentation mode mobile --- */
            body.mode-presentation .frame {
                padding: var(--space-lg);
                padding-bottom: calc(var(--space-lg) + 60px); /* clearance for nav bar */
                align-items: flex-start;
                overflow-x: hidden;
                min-width: 0;
                /* Remove transform to prevent iOS scroll lock on
                   position:fixed + overflow:auto elements */
                transform: none;
                transition: opacity var(--transition-med);
            }

            body.mode-presentation .frame.active {
                transform: none;
            }

            body.mode-presentation .frame.zoom-in,
            body.mode-presentation .frame.zoom-out {
                animation: none;
            }

            body.mode-presentation .frame-content {
                min-width: 0;
                max-width: 100%;
                overflow-x: auto;
                width: 100%;
            }

            /* --- Document mode mobile --- */
            body.mode-document .canvas {
                padding: var(--space-md);
                max-width: 100vw;
                overflow-x: hidden;
            }

            body.mode-document .frame {
                padding: var(--space-lg) var(--space-md);
                overflow: hidden;
                max-width: 100%;
                min-width: 0;
            }

            body.mode-document .frame-content {
                min-width: 0;
                max-width: 100%;
                overflow-x: auto;
            }

            /* --- Nav bar mobile --- */
            .nav-ui {
                max-width: calc(100vw - var(--space-lg) * 2);
                gap: var(--space-sm);
                padding: var(--space-sm) var(--space-md);
            }

            .progress-bar {
                width: 60px;
            }

            .help-hint {
                display: none;
            }

            /* --- Tables and code blocks: horizontal scroll on mobile --- */
            table {
                display: block;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                max-width: 100%;
            }

            thead, tbody {
                display: block;
                width: 100%;
            }

            tr {
                display: flex;
                width: 100%;
            }

            th, td {
                flex: 1;
                min-width: 0;
            }

            pre {
                overflow-x: auto;
                max-width: 100%;
            }
        }

        /* ========================================
           PRINT
           ======================================== */

        @media print {
            body {
                background: white;
            }

            .canvas {
                max-width: none;
            }

            .frame {
                page-break-after: always;
                box-shadow: none;
                border: 1px solid var(--grid-line);
            }

            .nav-ui {
                display: none;
            }

            .deep-dive {
                display: block;
            }
        }

        /* ========================================
           ENTRANCE ANIMATIONS
           ======================================== */

        body.mode-presentation .frame.active .animate-in {
            animation: fadeSlideUp 600ms ease-out forwards;
        }

        body.mode-presentation .frame.active .animate-in:nth-child(1) { animation-delay: 0ms; }
        body.mode-presentation .frame.active .animate-in:nth-child(2) { animation-delay: 100ms; }
        body.mode-presentation .frame.active .animate-in:nth-child(3) { animation-delay: 200ms; }
        body.mode-presentation .frame.active .animate-in:nth-child(4) { animation-delay: 300ms; }
        body.mode-presentation .frame.active .animate-in:nth-child(5) { animation-delay: 400ms; }

        @keyframes fadeSlideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        body.mode-presentation .animate-in {
            opacity: 0;
        }

        /* ========================================
           HOOK SLIDE: Margin Note + Opacity Reveal
           ======================================== */

        .hook-reveal {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            max-width: 700px;
            margin: 0 auto;
            cursor: pointer;
            min-height: 180px;
        }

        .hook-reveal .big-number {
            transition: all var(--transition-med);
            flex-shrink: 0;
        }

        .hook-reveal.revealed .big-number {
            align-items: flex-start;
        }

        .hook-reveal.revealed .big-number .value {
            font-size: clamp(1.5rem, 3vw, 2rem);
            color: var(--data-grey);
            opacity: 0.6;
        }

        .hook-reveal.revealed .big-number .label {
            font-size: 0.7rem;
        }

        .hook-reveal .insight-panel {
            opacity: 0;
            transform: translateX(30px);
            transition: all var(--transition-med);
            max-width: 0;
            max-height: 0;
            overflow: hidden;
        }

        .hook-reveal.revealed .insight-panel {
            opacity: 1;
            transform: translateX(0);
            max-width: 500px;
            max-height: 400px;
            margin-left: var(--space-lg);
            padding-left: var(--space-lg);
            border-left: 2px solid var(--grid-line);
        }

        .hook-reveal .insight-panel .insight-main {
            font-family: var(--font-display);
            font-size: 1.4rem;
            font-style: italic;
            color: var(--ink);
            margin-bottom: var(--space-sm);
        }

        .hook-reveal .insight-panel .insight-detail {
            font-size: 0.85rem;
            color: var(--ink-light);
            white-space: nowrap;
        }

        .hook-reveal .insight-panel .insight-detail strong {
            color: var(--accent-teal);
        }

        .hook-hint {
            font-family: var(--font-ui);
            font-size: 0.7rem;
            color: var(--data-grey);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            margin-top: var(--space-md);
            opacity: 0.6;
            transition: opacity var(--transition-fast);
        }

        .hook-reveal.revealed + .hook-hint,
        .hook-hint:hover {
            opacity: 0;
        }

        /* ========================================
           SCROLL RESISTANCE INDICATOR
           ======================================== */

        .scroll-indicator {
            position: fixed;
            left: 0;
            right: 0;
            height: 40px;
            pointer-events: none;
            z-index: 1000;
            opacity: 0;
            transition: opacity 200ms ease-out;
        }

        .scroll-indicator.visible {
            opacity: 1;
        }

        .scroll-indicator.next {
            bottom: 60px; /* Above nav bar */
        }

        .scroll-indicator.prev {
            top: 0;
        }

        /* The extending line - grows from center */
        .scroll-indicator::before {
            content: '';
            position: absolute;
            left: 50%;
            height: 2px;
            background: var(--accent-teal);
            transform: translateX(-50%);
            /* Use numeric progress (0-1) to calculate width: min 10%, max 100% */
            --min-width: 10;
            --max-width: 100;
            --progress: var(--scroll-progress-num, 0);
            width: calc((var(--min-width) + (var(--max-width) - var(--min-width)) * var(--progress)) * 1%);
            border-radius: 1px;
        }

        .scroll-indicator.next::before {
            bottom: 0;
        }

        .scroll-indicator.prev::before {
            top: 0;
        }

        /* Ready-to-transition state - line pulses */
        .scroll-indicator.ready::before {
            animation: scroll-ready-pulse 400ms ease-in-out;
        }

        @keyframes scroll-ready-pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        /* Hide indicators in document mode */
        body.mode-document .scroll-indicator {
            display: none;
        }