/* ============================================
   RayMap3R — Project Page Stylesheet
   Theme: Ray-inspired dual-tone design (light)
   ============================================ */

:root {
    --bg: #f4f6f9;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-elevated: rgba(255, 255, 255, 0.95);
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --accent-static: #059669;
    --accent-dynamic: #e05520;
    --accent-blue: #2563eb;
    --gradient-title: linear-gradient(135deg, var(--accent-static) 0%, var(--accent-blue) 50%, var(--accent-dynamic) 100%);
    --border-subtle: rgba(5, 150, 105, 0.12);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.06);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    zoom: 0.95;
}
a { color: var(--accent-static); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-dynamic); }
img { max-width: 100%; height: auto; display: block; border-radius: 6px; }

/* --- Background Effects --- */
.ray-field {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -3;
    background:
        radial-gradient(ellipse 100% 70% at 20% 80%, rgba(5, 150, 105, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse 80% 60% at 80% 20%, rgba(224, 85, 32, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse 60% 80% at 50% 50%, rgba(37, 99, 235, 0.03) 0%, transparent 50%),
        var(--bg);
}

/* Animated Ray Lines */
.ray-lines {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: -2; pointer-events: none; overflow: hidden;
}
.ray {
    position: absolute; width: 1px; height: 200%; transform-origin: top center;
    will-change: transform, opacity;
}
.ray-1 { left: 10%; background: linear-gradient(to bottom, transparent, var(--accent-static), transparent); animation: ray-sweep-1 12s ease-in-out infinite; opacity: 0.06; }
.ray-2 { left: 30%; background: linear-gradient(to bottom, transparent, var(--accent-dynamic), transparent); animation: ray-sweep-2 15s ease-in-out infinite; opacity: 0.06; }
.ray-3 { left: 55%; background: linear-gradient(to bottom, transparent, var(--accent-blue), transparent); animation: ray-sweep-3 18s ease-in-out infinite; opacity: 0.06; }
.ray-4 { left: 75%; background: linear-gradient(to bottom, transparent, var(--accent-static), transparent); animation: ray-sweep-4 14s ease-in-out infinite; opacity: 0.04; }
.ray-5 { left: 90%; background: linear-gradient(to bottom, transparent, var(--accent-dynamic), transparent); animation: ray-sweep-5 20s ease-in-out infinite; opacity: 0.06; }
.ray-6 { left: 45%; background: linear-gradient(to bottom, transparent, var(--accent-blue), transparent); animation: ray-sweep-6 16s ease-in-out infinite; opacity: 0.04; }

@keyframes ray-sweep-1 { 0%,100% { transform: translateY(-30%) rotate(-2deg); opacity:0.06; } 50% { transform: translateY(-50%) rotate(3deg); opacity:0.1; } }
@keyframes ray-sweep-2 { 0%,100% { transform: translateY(-40%) rotate(1deg); opacity:0.06; } 50% { transform: translateY(-20%) rotate(-2deg); opacity:0.1; } }
@keyframes ray-sweep-3 { 0%,100% { transform: translateY(-25%) rotate(-1deg); opacity:0.06; } 50% { transform: translateY(-45%) rotate(2deg); opacity:0.1; } }
@keyframes ray-sweep-4 { 0%,100% { transform: translateY(-35%) rotate(2deg); opacity:0.04; } 50% { transform: translateY(-55%) rotate(-3deg); opacity:0.08; } }
@keyframes ray-sweep-5 { 0%,100% { transform: translateY(-20%) rotate(-1deg); opacity:0.06; } 50% { transform: translateY(-40%) rotate(1deg); opacity:0.08; } }
@keyframes ray-sweep-6 { 0%,100% { transform: translateY(-45%) rotate(1deg); opacity:0.04; } 50% { transform: translateY(-25%) rotate(-2deg); opacity:0.08; } }

#grid-canvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1; pointer-events: none;
}

/* --- Glass Card --- */
.glass-card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
    padding: 18px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

/* Decorative top line on cards */
.glass-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 2px;
    border-radius: 16px 16px 0 0;
    background: var(--gradient-title);
    opacity: 0.5;
}

/* --- Layout --- */
.container { max-width: 1060px; margin: 0 auto; padding: 0 24px; }
section { padding: 40px 0 28px; }

/* --- Header / Nav --- */
header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    padding: 1rem 2rem;
    display: flex; justify-content: space-between; align-items: center;
    background: linear-gradient(to bottom, var(--bg) 0%, rgba(244, 246, 249, 0.8) 60%, transparent 100%);
}
.logo {
    font-family: 'Fira Code', monospace; font-size: 1.15rem; font-weight: 600;
    background: var(--gradient-title);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    background-size: 200% auto;
    animation: shimmer 4s ease-in-out infinite;
}
nav { display: flex; align-items: center; }
nav a {
    color: var(--text-secondary); margin-left: 2rem; font-size: 0.88rem; font-weight: 400;
    position: relative; transition: color 0.3s;
}
nav a::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
    background: var(--gradient-title); transition: width 0.3s;
}
nav a:hover { color: var(--text-primary); text-decoration: none; }
nav a:hover::after { width: 100%; }

/* --- Hero --- */
.hero {
    min-height: auto; display: flex; align-items: center; justify-content: center;
    text-align: center; padding: 5rem 2rem 2rem;
}
.hero-content { max-width: 900px; }
.venue-badge {
    display: inline-flex; align-items: center; gap: 0.5rem;
    background: rgba(5, 150, 105, 0.08);
    border: 1px solid rgba(5, 150, 105, 0.25);
    padding: 0.45rem 1.2rem; border-radius: 2rem;
    font-size: 0.82rem; font-weight: 600; letter-spacing: 0.5px;
    color: var(--accent-static);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease-out, badge-pulse 3s ease-in-out infinite;
}
.venue-badge svg { stroke: var(--accent-static); }
@keyframes badge-pulse {
    0%,100% { box-shadow: 0 0 12px rgba(5, 150, 105, 0.1); }
    50% { box-shadow: 0 0 24px rgba(5, 150, 105, 0.2); }
}
.title-container { animation: fadeInUp 0.8s ease-out 0.1s both; }
h1 {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 400; line-height: 1.25; margin-bottom: 1.2rem;
}
h1 .highlight {
    background: var(--gradient-title);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    background-size: 200% auto;
    animation: shimmer 4s ease-in-out infinite;
}
@keyframes shimmer {
    0%,100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}
.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: var(--text-secondary); font-weight: 300;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* Authors */
.authors {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 0.3rem 1.5rem; margin-bottom: 0.8rem;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}
.author { font-size: 1.12rem; font-weight: 400; }
.author a { color: var(--text-primary); transition: all 0.2s; }
.author a:hover { color: var(--accent-static); text-shadow: 0 0 12px rgba(5, 150, 105, 0.3); text-decoration: none; }
.author sup { font-size: 0.65rem; color: var(--accent-static); margin-left: 1px; }
.affiliations {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 0.5rem 2rem; color: var(--text-muted); font-size: 0.95rem;
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease-out 0.35s both;
}
.affiliations sup { font-size: 0.65rem; color: var(--text-muted); margin-right: 2px; }

/* CTA Buttons */
.cta-buttons {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 12px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
    margin-bottom: 3rem;
}
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 0.7rem 1.5rem; border-radius: 10px;
    font-size: 0.95rem; font-weight: 500;
    text-decoration: none; transition: all 0.3s;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary {
    background: var(--gradient-title); color: #fff;
    position: relative; overflow: hidden;
}
.btn-primary::after {
    content: ''; position: absolute; top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: linear-gradient(transparent, rgba(255,255,255,0.15), transparent);
    transform: rotate(45deg) translateY(-100%);
    transition: transform 0.6s;
}
.btn-primary:hover::after { transform: rotate(45deg) translateY(0); }
.btn-primary:hover { color: #fff; text-decoration: none; box-shadow: 0 4px 20px rgba(5, 150, 105, 0.3); }
.btn-secondary {
    background: var(--glass-bg); color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
}
.btn-secondary:hover {
    border-color: var(--accent-static); color: var(--accent-static);
    text-decoration: none; box-shadow: 0 4px 16px rgba(5, 150, 105, 0.15);
}

/* Scroll hint - hidden */
.scroll-hint { display: none; }

/* --- Animations --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Scroll Reveal */
.reveal {
    opacity: 0; transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.revealed {
    opacity: 1; transform: translateY(0);
}

/* --- Section Titles --- */
.section-title {
    font-family: 'DM Serif Display', serif;
    font-size: 2.1rem; font-weight: 400; text-align: center;
    margin-bottom: 24px; position: relative;
}
.section-title::after {
    content: ''; display: block; width: 50px; height: 3px;
    background: var(--gradient-title); border-radius: 2px;
    margin: 12px auto 0;
}
.sub-title {
    text-align: center; font-size: 1.35rem; font-weight: 600;
    color: var(--text-secondary); margin-bottom: 12px; margin-top: 32px;
}
.section-desc {
    text-align: center; font-size: 1rem; color: var(--text-muted);
    max-width: 900px; margin: 0 auto 16px; line-height: 1.75;
}

/* --- Teaser --- */
.teaser { padding: 10px 0 36px; }
.teaser .glass-card { padding: 18px; }
.teaser img { border-radius: 8px; }
.figure-caption {
    text-align: center; font-size: 1rem; color: var(--text-secondary);
    margin-top: 14px; line-height: 1.75; max-width: 900px; margin-left: auto; margin-right: auto;
}
.figure-caption strong { color: var(--text-primary); }

/* --- Accent Colors for Text --- */
.accent-static { color: var(--accent-static); font-weight: 500; }
.accent-dynamic { color: var(--accent-dynamic); font-weight: 500; }

/* --- Abstract --- */
.abstract-card { max-width: 860px; margin: 0 auto; }
.abstract-text {
    font-size: 1.05rem; line-height: 1.8; text-align: justify;
    color: var(--text-secondary);
}
.abstract-text strong { color: var(--text-primary); }

/* --- Features/Contributions --- */
.features-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.feature-card { text-align: center; padding: 28px 20px; }
.feature-card h3 {
    font-family: 'Inter', sans-serif; font-size: 1rem; font-weight: 600;
    margin-bottom: 10px; color: var(--text-primary);
}
.feature-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }
.feature-icon {
    width: 48px; height: 48px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px;
}
.feature-icon svg { width: 24px; height: 24px; }
.static-icon { background: rgba(5, 150, 105, 0.1); }
.static-icon svg { stroke: var(--accent-static); }
.dynamic-icon { background: rgba(224, 85, 32, 0.1); }
.dynamic-icon svg { stroke: var(--accent-dynamic); }
.accent-icon { background: rgba(37, 99, 235, 0.1); }
.accent-icon svg { stroke: var(--accent-blue); }

/* --- Pipeline --- */
.pipeline-card { padding: 18px; }
.pipeline-card img { border-radius: 8px; }

/* --- Results --- */
.video-grid {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px;
}
.video-card { grid-column: span 2; }
.video-card { padding: 8px; overflow: hidden; }
.video-card video { width: 100%; display: block; border-radius: 8px; }
.video-card .video-label {
    padding: 8px 0 2px; font-size: 0.88rem; color: var(--text-muted);
    font-weight: 500; text-align: center;
}
.video-card.video-half-left { grid-column: 1 / 4; }
.video-card.video-half-right { grid-column: 4 / 7; }

/* --- Tables --- */
.table-caption {
    text-align: center; font-size: 0.85rem; color: var(--text-muted);
    margin-bottom: 10px; font-weight: 500;
}
.table-card { padding: 16px; overflow: hidden; }
.table-card::before { display: none; }
.table-wrapper { overflow-x: auto; }
.results-table {
    width: 100%; border-collapse: collapse; font-size: 0.82rem; text-align: center;
}
.results-table th {
    padding: 8px 8px; font-weight: 600; font-size: 0.78rem;
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
    color: var(--text-secondary); white-space: nowrap;
}
.results-table td {
    padding: 6px 8px; white-space: nowrap;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    color: var(--text-secondary);
}
.results-table .method-col { text-align: left; font-weight: 500; color: var(--text-primary); }
.results-table .tag-offline { color: var(--text-muted); font-size: 0.75rem; }
.results-table .tag-online { color: var(--accent-static); font-size: 0.75rem; }
.results-table .divider-row td { border-top: 2px solid rgba(0, 0, 0, 0.08); }
.results-table .highlight-row td {
    background: rgba(5, 150, 105, 0.06);
    font-weight: 600; color: var(--text-primary);
}
.results-table .best { color: var(--accent-static); font-weight: 700; }
.table-note {
    text-align: center; font-size: 0.75rem; color: var(--text-muted); margin-top: 8px;
}

/* --- Citation --- */
.citation-box { max-width: 720px; margin: 0 auto; position: relative; }
.citation-box pre {
    font-family: 'Fira Code', monospace; font-size: 0.88rem;
    line-height: 1.8; white-space: pre-wrap; word-break: break-all;
    color: var(--text-secondary); margin: 0;
}
.copy-btn {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 8px; padding: 6px 18px;
    font-size: 0.78rem; font-family: 'Inter', sans-serif;
    cursor: pointer; color: var(--text-muted);
    transition: all 0.2s;
    margin: 16px auto 0;
}
.citation-box { text-align: center; }
.citation-box pre { text-align: left; }
.copy-btn:hover { background: rgba(0, 0, 0, 0.1); color: var(--text-primary); }
.copy-btn svg { stroke: currentColor; }

/* --- Footer --- */
footer {
    text-align: center; padding: 40px 0;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}
.footer-links {
    display: flex; justify-content: center; align-items: center;
    gap: 8px; font-size: 0.85rem; color: var(--text-muted);
    margin-bottom: 6px;
}
.footer-links a { color: var(--text-secondary); }
.footer-links .dot { color: var(--text-muted); }
.footer-copy { font-size: 0.78rem; color: var(--text-muted); }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    header { padding: 0.8rem 1rem; }
    nav a { margin-left: 1rem; font-size: 0.78rem; }

    .hero { padding: 4rem 1.5rem 1.5rem; }
    h1 { font-size: 1.6rem; }
    .subtitle { font-size: 0.95rem; }
    .authors { gap: 0.2rem 0.8rem; }
    .author { font-size: 0.9rem; }

    .cta-buttons { flex-direction: column; align-items: center; }
    .btn { width: 200px; justify-content: center; }

    .features-grid { grid-template-columns: 1fr; }
    .video-grid { grid-template-columns: 1fr; }
    .video-card, .video-card.video-half-left, .video-card.video-half-right { grid-column: span 1; }

    .section-title { font-size: 1.4rem; }
    .glass-card { padding: 16px; border-radius: 12px; }
    .glass-card::before { border-radius: 12px 12px 0 0; }

    .results-table { font-size: 0.7rem; }
    .results-table th, .results-table td { padding: 4px 5px; }

    .ray { display: none; }
    #grid-canvas { opacity: 0.3; }
}

@media (max-width: 480px) {
    nav a { margin-left: 0.6rem; font-size: 0.72rem; }
    h1 { font-size: 1.35rem; }
    .affiliations { font-size: 0.8rem; }
}

/* ============================================
   New sections: Static Bias, Tabs, Method List
   ============================================ */

/* --- Green accent color --- */
.accent-green { color: #059669; font-weight: 500; }

/* --- Hero TL;DR --- */
.hero-tldr {
    text-align: center; font-size: 1.25rem;
    color: var(--text-secondary); margin: 20px auto 0;
    max-width: 1060px; padding: 0 24px;
    line-height: 1.65;
}
.hero-tldr strong {
    color: var(--accent-static); font-weight: 600; letter-spacing: 2px;
}

/* --- Section lead text --- */
.section-lead {
    font-size: 1.05rem; line-height: 1.8; color: var(--text-secondary);
    max-width: 900px; margin: 0 auto 16px; text-align: justify;
}

/* --- Toggle Buttons (for Static Bias figures) --- */
.toggle-group {
    display: flex; justify-content: center; gap: 0;
    margin-bottom: 16px; border-bottom: 2px solid rgba(0,0,0,0.06);
}
.toggle-btn {
    padding: 8px 22px; font-family: 'Inter', sans-serif;
    font-size: 0.95rem; font-weight: 400; color: var(--text-muted);
    background: none; border: none;
    border-bottom: 2px solid transparent; margin-bottom: -2px;
    cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.toggle-btn:hover { color: var(--text-primary); }
.toggle-btn.active {
    color: var(--accent-static); font-weight: 600;
    border-bottom-color: var(--accent-static);
}
.toggle-content { display: none; }
.toggle-content.active { display: block; }

/* --- Tabs (for Results) --- */
.tabs { margin: 16px 0 28px; }
.tab-bar {
    display: flex; gap: 0;
    border-bottom: 2px solid rgba(0,0,0,0.06);
    margin-bottom: 16px;
}
.tab-btn {
    padding: 9px 22px; font-family: 'Inter', sans-serif;
    font-size: 0.95rem; font-weight: 400; color: var(--text-muted);
    background: none; border: none;
    border-bottom: 2px solid transparent; margin-bottom: -2px;
    cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
    color: var(--accent-static); font-weight: 600;
    border-bottom-color: var(--accent-static);
}
.tab-content { display: none; }
.tab-content.active { display: block; }
.tab-content video {
    width: 100%; display: block; border-radius: 8px;
}
.tab-content img { border-radius: 8px; max-width: 100%; }

/* --- Method bullet list --- */
.method-list {
    max-width: 900px; margin: 16px auto 0;
    padding-left: 20px; color: var(--text-secondary);
    font-size: 1.05rem; line-height: 1.75;
}
.method-list li { margin-bottom: 14px; }
.method-list strong { color: var(--text-primary); }

/* --- Table images --- */
.table-img {
    border: 1px solid rgba(0,0,0,0.06); border-radius: 8px;
    width: 85%; margin: 0 auto; display: block;
}

/* --- Single video card (full width, crop black bars) --- */
.video-single { padding: 0; overflow: hidden; border-radius: 16px; }
.video-single video {
    width: 100%; display: block;
    margin-top: -1px; margin-bottom: -1px;
}