/*
 * Hand2World Project Page Styles
 * Hybrid design: Control_Color polish + GenColor academic structure
 */

/* ==================== Design Tokens ==================== */
:root {
    /* Colors - Black & White theme */
    --primary: #000000;           /* Pure black */
    --primary-dark: #1a1a1a;
    --primary-light: #f5f5f5;
    --accent: #333333;            /* Dark gray */
    --accent-dark: #1a1a1a;
    --text: #000000;              /* Black text */
    --text-light: #666666;
    --bg: #ffffff;
    --bg-alt: #ffffff;            /* White for all sections */
    --border: #e0e0e0;
    --border-light: #f0f0f0;

    /* Spacing - tighter like GenColor */
    --max-width: 1200px;
    --text-max-width: 1000px;
    --section-padding: 2rem 2rem;
    --container-padding: 0 2rem;

    /* Visual */
    --video-radius: 6px;
    --card-radius: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    /* Typography - Google Sans like GenColor */
    --font-title: "Google Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
}

/* ==================== Global Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text);
    background: #ffffff;
    line-height: 1.6;
    /* Better touch scrolling on mobile */
    -webkit-overflow-scrolling: touch;
    /* Prevent text selection during drag operations */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Allow text selection for readable content */
p, h1, h2, h3, h4, h5, h6, span, a, li, pre, code {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

/* Smooth scrolling for mobile */
section {
    scroll-margin-top: 80px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

/* ==================== Typography ==================== */
h1 {
    font-family: var(--font-title);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text);
    letter-spacing: -0.02em;
}

h2 {
    font-family: var(--font-title);
    font-size: clamp(1.75rem, 3.5vw, 2.25rem);
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text);
    letter-spacing: -0.01em;
}

h3 {
    font-family: var(--font-title);
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text);
}

h4 {
    font-family: var(--font-title);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text);
}

p {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    color: var(--text);
}

/* ==================== Navigation ==================== */
#navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.2s;
}

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

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

/* Demo link - special button style */
.nav-links a.demo-link {
    background: var(--primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    margin-left: 0.5rem;
}

.nav-links a.demo-link::after {
    display: none;
}

.nav-links a.demo-link:hover {
    background: var(--accent);
    color: white;
}

/* ==================== Title Section ==================== */
#title {
    text-align: center;
    padding: 4rem 2rem 1.5rem;  /* Extra top for title, bottom matches section spacing */
    background: var(--bg);
    max-width: var(--max-width);
    margin: 0 auto;
}

#title h1 {
    font-family: var(--font-title);
    color: var(--text);
    margin-bottom: 1.5rem;
    font-size: clamp(1.75rem, 3.5vw, 2.65rem);
    line-height: 1.3;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.authors {
    font-size: 1.0625rem;
    margin: 1.5rem auto 0.75rem;
    color: var(--text);
    max-width: var(--text-max-width);
    line-height: 1.8;
}

.authors span {
    display: inline-block;
    margin: 0 0.35rem;
}

.affiliation {
    font-size: 0.9375rem;
    color: var(--text-light);
    margin: 0.75rem auto 1.25rem;
    max-width: var(--text-max-width);
}

.links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn .icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

/* ==================== Sections ==================== */
section {
    padding: 3rem 2rem;  /* More space between major sections */
}

section h2 {
    margin-top: 0;
    margin-bottom: 1rem;
}

/* Remove bottom margin from last child in every section to keep spacing consistent */
section .container > *:last-child {
    margin-bottom: 0;
}

.bg-alt {
    background: var(--bg-alt);
}

/* Card-based section container (like GenColor) */
.section-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
    margin: 2rem 0;
    border: 1px solid var(--border-light);
}

/* ==================== Hero Section ==================== */
#hero {
    padding: 1.5rem 2rem;  /* Same as all sections */
}

.hero-desc {
    text-align: center;
    max-width: var(--text-max-width);
    margin: 0 auto 2.5rem;
    font-size: 1.05rem;
    color: var(--text-light);
    line-height: 1.6;
}

video {
    width: 100%;
    border-radius: var(--video-radius);
    box-shadow: var(--shadow);
    background: #000;
    object-fit: cover;
}

.scene-image {
    width: 100%;
    border-radius: var(--video-radius);
    box-shadow: var(--shadow);
    display: block;
}

.video-caption {
    font-size: 0.9375rem;
    color: var(--text-light);
    line-height: 1.4;
    margin-bottom: 0.25rem;
}

/* Sync Play Button */
.sync-play-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    margin: 0.75rem auto 0.5rem;
    max-width: 800px;
    gap: 1rem;
}

.sync-play-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    min-width: 120px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
}

.sync-play-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sync-play-button:active {
    transform: translateY(0);
}

.sync-play-button.playing {
    background: var(--accent);
}

.sync-play-button.playing:hover {
    background: var(--accent-dark);
}

.sync-play-button .play-icon {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.sync-play-button.playing .play-icon {
    display: none;
}

.sync-play-button.playing::before {
    content: '';
    width: 4px;
    height: 18px;
    background: white;
    border-radius: 2px;
    margin-right: 4px;
}

.sync-play-button.playing::after {
    content: '';
    width: 4px;
    height: 18px;
    background: white;
    border-radius: 2px;
}

/* Sync Progress Bar */
.sync-progress-bar-container {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sync-time-display {
    font-size: 0.875rem;
    color: var(--text-light);
    font-variant-numeric: tabular-nums;
    min-width: 100px;
    text-align: right;
}

.sync-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-light);
    border-radius: 4px;
    position: relative;
    cursor: pointer;
    transition: height 0.2s;
}

.sync-progress-bar:hover {
    height: 12px;
}

.sync-progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    width: 0%;
    transition: width 0.1s linear;
    position: relative;
}

.sync-progress-handle {
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background: white;
    border: 2px solid var(--primary);
    border-radius: 50%;
    box-shadow: var(--shadow);
    cursor: grab;
    transition: transform 0.2s;
}

.sync-progress-handle:active {
    cursor: grabbing;
    transform: translateY(-50%) scale(1.2);
}

.sync-progress-bar:hover .sync-progress-handle {
    transform: translateY(-50%) scale(1.15);
}

/* ==================== Abstract ==================== */
#abstract {
    background: white;
}

.abstract-text {
    max-width: var(--text-max-width);
    margin: 0 auto;
    font-size: 1.2rem;
    line-height: 1.7;
    text-align: center;
    color: var(--text);
    padding: 2rem;
    background: var(--bg-alt);
    border-radius: var(--card-radius);
    border-left: 4px solid var(--primary);
}

/* ==================== Method Section ==================== */
.method-diagram {
    margin: 1rem 0 0;
    text-align: center;
}

.diagram-img {
    max-width: 100%;
    height: auto;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
}

.contributions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.contribution {
    background: white;
    padding: 1.5rem;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.contribution:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contrib-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.125rem;
}

.contribution h4 {
    color: var(--primary);
    margin-bottom: 0.75rem;
    padding-right: 3rem;
}

.contribution p {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text);
    margin-bottom: 1rem;
}

.contrib-highlight {
    background: var(--bg-alt);
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--text);
    border-left: 3px solid var(--accent);
}

/* ==================== Results Section ==================== */
.results-table {
    margin: 2rem 0;
    text-align: center;
}

.table-img {
    max-width: 100%;
    height: auto;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
}

.results-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.metric-card {
    background: white;
    padding: 2rem 1.5rem;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.2s;
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.metric-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.metric-label {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0.75rem 0 0.5rem;
    color: var(--text);
}

.metric-desc {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ==================== Comparisons Section ==================== */
.section-desc {
    text-align: left;
    max-width: var(--text-max-width);
    margin: 0 0 0.25rem;
    font-size: 1.05rem;
    color: var(--text-light);
}

.slide-title {
    text-align: center;
    margin-bottom: 0.75rem !important;
    margin-top: 1rem !important;
    color: var(--text);
    font-size: 1.25rem;
}

/* 4-column layout: Scene Image | Input | Control | Generated */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin: 2rem 0;
    padding: 2rem;
    background: white;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
}

/* Compact layout with reduced spacing */
.comparison-grid.compact {
    gap: 0.5rem;
    padding: 0;
    margin: 0.5rem 0;
    grid-template-columns: 1fr 1fr;
    background: transparent;
    box-shadow: none;
    align-items: stretch;
    grid-auto-rows: 1fr;
}

/* Group container for columns */
.comparison-grid.compact .method-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 3px solid #000000;
    border-radius: 6px;
    background: white;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    align-items: stretch;
    height: 100%;
}

.comparison-grid.compact .method-group:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.comparison-grid.compact .method-group .method-col {
    padding: 0.5rem;
    border-radius: 0;
    background: white;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.comparison-grid.compact .method-group .method-col:hover {
    transform: none;
    box-shadow: none;
}

.comparison-grid.compact .method-col {
    padding: 0.5rem;
}

.comparison-grid.compact .method-label {
    margin-bottom: 0.375rem;
    padding: 0.25rem;
    font-size: 0.875rem;
}

.method-col {
    display: flex;
    flex-direction: column;
    background: var(--bg-alt);
    padding: 1rem;
    border-radius: var(--video-radius);
    transition: all 0.2s;
}

.method-col:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.method-label {
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.75rem;
    color: var(--text);
    min-height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    background: white;
    border-radius: 4px;
}

.method-ours {
    position: relative;
    background: var(--primary-light);
}

.method-ours .method-label {
    background: var(--primary);
    color: white;
}

.comparison-grid.compact .method-ours::before {
    display: none;
}

/* Method selection toggles (like GenColor) */
.method-selector {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--bg-alt);
    border-radius: var(--card-radius);
}

.method-btn {
    padding: 0.625rem 1.25rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-body);
}

.method-btn:hover {
    background: var(--bg-alt);
    border-color: var(--primary);
}

.method-btn.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

/* Swiper customization */
.swiper {
    padding: 2rem 3rem;
}

.swiper-slide {
    opacity: 1;
}

.swiper-button-prev,
.swiper-button-next {
    color: var(--primary);
    background: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.swiper-button-prev:after,
.swiper-button-next:after {
    font-size: 1.25rem;
    font-weight: 700;
}

.swiper-pagination-bullet {
    background: var(--primary);
}

/* Dataset tabs */
.dataset-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.dataset-tab {
    padding: 0.75rem 2rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.dataset-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.dataset-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.dataset-panel {
    display: none;
    padding: 2rem;
    background: white;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow);
    margin-top: 2rem;
}

.dataset-panel.active {
    display: block;
}

.dataset-note {
    padding: 1rem;
    background: var(--bg-alt);
    border-left: 4px solid var(--accent);
    border-radius: 4px;
    margin-top: 1rem;
    font-size: 0.9375rem;
    color: var(--text-light);
}

/* ==================== Ablations ==================== */
.ablation-comparison {
    margin: 2rem 0;
}

.ablation-note {
    padding: 1.5rem;
    background: var(--bg-alt);
    border-left: 4px solid var(--accent);
    border-radius: 4px;
    font-size: 1rem;
    color: var(--text-light);
}

/* ==================== Citation ==================== */
#citation pre {
    background: var(--text);
    color: #f9fafb;
    padding: 2rem;
    border-radius: var(--card-radius);
    overflow-x: auto;
    box-shadow: var(--shadow);
    margin-top: 1.5rem;
}

#citation code {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.8;
}

/* ==================== Footer ==================== */
footer {
    background: var(--text);
    color: #9ca3af;
    text-align: center;
    padding: 3rem 2rem;
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .comparison-grid {
        grid-template-columns: repeat(2, 1fr);  /* 2x2 grid on tablets */
        gap: 1.25rem;
        padding: 1.5rem;
    }

    .comparison-grid.compact {
        gap: 0.75rem;
        padding: 1rem;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 2rem 1rem;
        --container-padding: 0 1rem;
    }

    .nav-container {
        flex-direction: column;
        gap: 0.75rem;
        padding: 0.75rem 1rem;
    }

    .nav-links {
        gap: 0.75rem;
        font-size: 0.8125rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-links a {
        padding: 0.25rem 0;
    }

    .demo-link {
        padding: 0.5rem 1rem !important;
        font-size: 0.8125rem !important;
    }

    #title {
        padding: 3rem 1rem 2rem;
    }

    #hero {
        padding: 2rem 1rem;
    }

    section {
        padding: var(--section-padding);
    }

    .comparison-grid {
        grid-template-columns: 1fr;  /* Stack vertically on mobile */
        gap: 1rem;
        padding: 1rem;
    }

    .comparison-grid.compact {
        gap: 0.75rem;
        padding: 0.5rem;
    }

    /* Dataset comparison grid - stack vertically */
    .comparison-grid-dataset {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }

    .method-group {
        grid-template-columns: 1fr !important;
        gap: 1rem;
    }

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

    .results-highlights {
        grid-template-columns: 1fr;
    }

    .dataset-tabs {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .dataset-tab {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .swiper {
        padding: 2rem 1rem;
    }

    .swiper-button-prev,
    .swiper-button-next {
        width: 36px;
        height: 36px;
    }

    .links {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

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

    /* Method selectors */
    .method-selector {
        padding: 1rem;
        gap: 0.5rem;
    }

    .method-btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .method-selector-dual {
        gap: 0.5rem;
        padding: 0 0.5rem;
    }

    .method-btn-dual {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }

    /* Single method selector for dataset reconstruction */
    .method-selector-single {
        gap: 0.5rem;
        padding: 0 0.5rem;
        flex-wrap: wrap;
    }

    .method-btn-single {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
        flex: 1 1 auto;
        min-width: fit-content;
    }

    /* Sync play controls - stack vertically on mobile */
    .sync-play-container {
        flex-direction: column !important;
        gap: 0.75rem;
        align-items: stretch !important;
    }

    .sync-progress-bar-container {
        max-width: 100% !important;
        width: 100% !important;
    }

    .sync-play-button {
        width: 100%;
        justify-content: center;
    }

    /* Video comparison slider - larger touch target */
    .compare-handle {
        width: 52px !important;
        height: 52px !important;
        margin-left: -26px;
    }

    .inline-video-compare .compare-handle {
        width: 44px !important;
        height: 44px !important;
    }

    .inline-video-compare-single .compare-handle {
        width: 48px !important;
        height: 48px !important;
    }

    /* Better touch interaction */
    .compare-slider {
        touch-action: none;
        cursor: grab;
        width: 6px !important;
    }

    .compare-slider.dragging {
        cursor: grabbing;
    }

    /* Disable hover effects on touch devices */
    @media (hover: none) {
        .compare-handle:hover,
        .compare-slider:hover {
            transform: none !important;
        }
    }

    /* Method labels */
    .method-label {
        font-size: 0.875rem;
        padding: 0.5rem;
    }

    /* Scene images */
    .scene-image {
        max-height: 250px;
    }

    /* BibTeX code block - better mobile scroll */
    pre {
        font-size: 0.75rem !important;
        padding: 1rem !important;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Method diagram */
    .method-diagram {
        margin: 2rem 0;
    }

    .diagram-img {
        border-radius: 4px;
    }

    /* Abstract text */
    .abstract-text {
        font-size: 1rem;
        line-height: 1.6;
    }

    .section-desc {
        font-size: 0.9375rem;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 1.5rem 0.75rem;
        --container-padding: 0 0.75rem;
    }

    h1 {
        font-size: 1.75rem;
        line-height: 1.3;
    }

    h2 {
        font-size: 1.375rem;
        margin-bottom: 1rem;
    }

    h3 {
        font-size: 1.125rem;
        margin-top: 1.5rem;
    }

    .nav-links {
        font-size: 0.75rem;
        gap: 0.5rem;
    }

    .demo-link {
        padding: 0.4rem 0.75rem !important;
        font-size: 0.75rem !important;
    }

    .results-highlights {
        grid-template-columns: 1fr;
    }

    .metric-value {
        font-size: 2rem;
    }

    .method-col {
        padding: 0.5rem;
    }

    /* Tighter spacing for method buttons */
    .method-selector-dual,
    .method-selector-single {
        gap: 0.375rem;
        padding: 0 0.25rem;
    }

    .method-btn-dual,
    .method-btn-single {
        padding: 0.4rem 0.6rem;
        font-size: 0.7rem;
        border-width: 1px;
    }

    /* Comparison grids */
    .comparison-grid,
    .comparison-grid.compact {
        padding: 0.5rem;
        gap: 0.75rem;
    }

    /* Video labels */
    .method-label {
        font-size: 0.8125rem;
        padding: 0.375rem;
    }

    /* Play button and progress bar */
    .sync-play-button {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }

    .sync-time-display {
        font-size: 0.75rem;
    }

    /* Paper link buttons */
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }

    .icon {
        width: 16px;
        height: 16px;
    }

    /* BibTeX */
    pre {
        font-size: 0.7rem !important;
        padding: 0.75rem !important;
    }

    /* Abstract text */
    .abstract-text {
        font-size: 1rem;
    }
}

/* ==================== Dual Method Selector ==================== */
.method-selector-dual {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 0.5rem 0;
}

.method-btn-dual {
    padding: 0.625rem 1.25rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-body);
}

.method-btn-dual:hover {
    border-color: var(--primary);
}

.method-btn-dual.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    font-weight: 600;
}

/* ==================== Single Method Selector (Dataset Reconstruction) ==================== */
.method-selector-single {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 0.5rem 0;
}

.method-btn-single {
    padding: 0.625rem 1.25rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-body);
}

.method-btn-single:hover {
    border-color: var(--primary);
}

.method-btn-single.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    font-weight: 600;
}

/* Dataset comparison grid: Scene | Method | GT | Comparison */
.comparison-grid-dataset {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 0.5rem;
    padding: 0;
    margin: 0.5rem 0;
    background: transparent;
    box-shadow: none;
    align-items: stretch;
    grid-auto-rows: 1fr;
}

/* Scene Image column - standalone with black border */
.comparison-grid-dataset > .method-col:first-child {
    border: 3px solid #000000;
    border-radius: 6px;
    padding: 0.5rem;
    background: white;
    display: flex;
    flex-direction: column;
}

/* Group the last 3 columns (Method, GT, Comparison) */
.comparison-grid-dataset .method-group {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0;
    border: 3px solid #000000;
    border-radius: 6px;
    background: white;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    align-items: stretch;
    height: 100%;
}

.comparison-grid-dataset .method-group:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.comparison-grid-dataset .method-group .method-col {
    padding: 0.5rem;
    border-radius: 0;
    background: white;
    display: flex;
    flex-direction: column;
}

.comparison-grid-dataset .method-group .method-col:hover {
    transform: none;
    box-shadow: none;
}

.comparison-grid-dataset > .method-col:first-child {
    padding: 0.5rem;
}

.comparison-grid-dataset .method-label {
    margin-bottom: 0.375rem;
    padding: 0.25rem;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.comparison-grid-dataset .scene-image {
    width: 100%;
    height: 100%;
    display: block;
    border-radius: var(--video-radius);
    object-fit: cover;
    flex: 1;
}

.comparison-grid-dataset video {
    width: 100%;
    height: 100%;
    display: block;
    border-radius: var(--video-radius);
    object-fit: cover;
    flex: 1;
}

.comparison-grid-dataset .inline-video-compare-single {
    width: 100%;
    height: 100%;
    flex: 1;
}

/* ==================== Inline Video Compare (within grid) ==================== */
.inline-video-compare-single {
    position: relative;
    width: 100%;
    border-radius: var(--video-radius);
    overflow: hidden;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.inline-video-compare-single video {
    border-radius: 0;
    box-shadow: none;
}

.inline-video-compare-single .compare-left {
    position: relative;
    width: 100%;
    height: 100%;
}

.inline-video-compare-single .compare-left video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.inline-video-compare-single .compare-right {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: inset(0 0 0 50%);
}

.inline-video-compare-single .compare-right video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.inline-video-compare-single .compare-slider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 4px;
    height: 100%;
    background: white;
    cursor: ew-resize;
    transform: translateX(-50%);
    z-index: 10;
    transition: background 0.2s;
}

.inline-video-compare-single .compare-slider:hover,
.inline-video-compare-single .compare-slider.dragging {
    background: var(--primary);
}

.inline-video-compare-single .compare-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    background: white;
    border: 3px solid var(--primary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    cursor: ew-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.inline-video-compare-single .compare-handle::before,
.inline-video-compare-single .compare-handle::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
}

.inline-video-compare-single .compare-handle::before {
    left: 8px;
    border-width: 6px 8px 6px 0;
    border-color: transparent var(--primary) transparent transparent;
}

.inline-video-compare-single .compare-handle::after {
    right: 8px;
    border-width: 6px 0 6px 8px;
    border-color: transparent transparent transparent var(--primary);
}

.inline-video-compare-single .compare-hover-labels {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    pointer-events: none;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.inline-video-compare-single:hover .compare-hover-labels {
    opacity: 1 !important;
}

.inline-video-compare-single .hover-label {
    background: rgba(255, 255, 255, 0.9);
    color: #000;
    padding: 0.4rem 0.75rem;
    border-radius: 4px;
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    white-space: nowrap;
}

/* ==================== Inline Video Compare (within grid) ==================== */
.inline-video-compare {
    position: relative;
    width: 100%;
    border-radius: var(--video-radius);
    overflow: hidden;
    cursor: pointer;
}

.inline-video-compare video {
    border-radius: 0;
    box-shadow: none;
}

.inline-video-compare .compare-left {
    position: relative;
    width: 100%;
}

.inline-video-compare .compare-left video {
    display: block;
    width: 100%;
    height: auto;
}

.inline-video-compare .compare-right {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: inset(0 0 0 50%);
}

.inline-video-compare .compare-right video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.inline-video-compare .compare-slider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 3px;
    height: 100%;
    background: white;
    cursor: ew-resize;
    z-index: 10;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
}

.inline-video-compare .compare-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 28px;
    height: 28px;
    background: white;
    border: 2px solid rgba(0, 0, 0, 0.3);
    border-radius: 50%;
    cursor: ew-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s;
}

.inline-video-compare .compare-handle:hover,
.inline-video-compare .compare-slider.dragging .compare-handle {
    transform: translate(-50%, -50%) scale(1.15);
}

.inline-video-compare .compare-handle::before,
.inline-video-compare .compare-handle::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
}

.inline-video-compare .compare-handle::before {
    left: 5px;
    border-width: 4px 5px 4px 0;
    border-color: transparent rgba(0, 0, 0, 0.4) transparent transparent;
}

.inline-video-compare .compare-handle::after {
    right: 5px;
    border-width: 4px 0 4px 5px;
    border-color: transparent transparent transparent rgba(0, 0, 0, 0.4);
}

/* Hover labels - white semi-transparent, shown on hover */
.compare-hover-labels {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0.4rem;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.3s;
}

.inline-video-compare:hover .compare-hover-labels {
    opacity: 1;
}

.hover-label {
    background: rgba(255, 255, 255, 0.85);
    color: #000;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ==================== Utility Classes ==================== */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 4rem;
}

.mb-4 {
    margin-bottom: 4rem;
}

/* ==================== Video Comparison Components ==================== */

/* Synchronized Video Player */
.sync-video-container {
    position: relative;
    margin: 2rem 0;
}

.sync-video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.sync-video-item {
    position: relative;
}

.sync-video-item video {
    width: 100%;
    height: auto;
    border-radius: var(--video-radius);
    background: #000;
    cursor: pointer;
}

.sync-video-label {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.875rem;
    font-weight: 600;
    pointer-events: none;
}

.sync-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-alt);
    border-radius: var(--card-radius);
}

.sync-play-btn {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.sync-play-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.sync-play-btn .icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.sync-progress-container {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    cursor: pointer;
}

.sync-progress {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.1s linear;
}

.sync-time {
    font-size: 0.875rem;
    color: var(--text-light);
    font-variant-numeric: tabular-nums;
    min-width: 80px;
    text-align: right;
}

/* Video Slider Comparison */
.video-slider-compare {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 2rem auto;
    border-radius: var(--video-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.compare-left,
.compare-right {
    position: relative;
    width: 100%;
}

.compare-right {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: inset(0 0 0 50%);
}

.compare-left video,
.compare-right video {
    display: block;
    width: 100%;
    height: auto;
    cursor: pointer;
}

.compare-slider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 4px;
    height: 100%;
    background: white;
    cursor: ew-resize;
    z-index: 10;
    transition: background 0.2s;
}

.compare-slider:hover,
.compare-slider.dragging {
    background: var(--accent);
}

.compare-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    background: white;
    border: 3px solid var(--accent);
    border-radius: 50%;
    cursor: ew-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s;
}

.compare-handle:hover,
.compare-slider.dragging .compare-handle {
    transform: translate(-50%, -50%) scale(1.1);
    border-color: var(--accent-dark);
}

.compare-handle::before,
.compare-handle::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
}

.compare-handle::before {
    /* Left arrow */
    left: 12px;
    border-width: 6px 8px 6px 0;
    border-color: transparent var(--accent) transparent transparent;
}

.compare-handle::after {
    /* Right arrow */
    right: 12px;
    border-width: 6px 0 6px 8px;
    border-color: transparent transparent transparent var(--accent);
}

.compare-labels {
    position: absolute;
    top: 1rem;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 1rem;
    pointer-events: none;
    z-index: 5;
}

.compare-label {
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .sync-video-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .sync-controls {
        flex-wrap: wrap;
    }

    .sync-time {
        width: 100%;
        text-align: center;
        margin-top: 0.5rem;
    }

    .compare-handle {
        width: 40px;
        height: 40px;
    }

    .compare-labels {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
}