:root {
    --primary: #FFFFFF;
    --secondary: #F8FAFC;
    --accent: #2563EB;
    --accent-hover: #1D4ED8;
    --accent-light: #3B82F6;
    --accent-green: #10B981;
    --accent-orange: #F97316;
    --accent-purple: #8B5CF6;
    --accent-pink: #EC4899;
    --text: #1E293B;
    --text-muted: #64748B;
    --text-light: #94A3B8;
    --gradient-1: linear-gradient(135deg, #2563EB 0%, #3B82F6 50%, #60A5FA 100%);
    --gradient-2: linear-gradient(180deg, rgba(37,99,235,0.08) 0%, rgba(59,130,246,0.03) 100%);
    --gradient-hero: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 50%, #BFDBFE 100%);
    --card-bg: #FFFFFF;
    --card-border: rgba(37,99,235,0.12);
    --card-shadow: 0 4px 24px rgba(37,99,235,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { 
    font-family: 'DM Sans', sans-serif; 
    background: var(--primary); 
    color: var(--text); 
    line-height: 1.6; 
    overflow-x: hidden; 
}
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--secondary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }

/* Progress Bar */
.progress-bar { 
    position: fixed; 
    top: 0; 
    left: 0; 
    height: 3px; 
    background: var(--gradient-1); 
    z-index: 1001; 
    width: 0%; 
}

/* Side Navigation - Left Sidebar */
.side-nav {
    position: fixed;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    padding: 1.5rem 0;
    background: transparent;
    opacity: 0;
    animation: sideNavFadeIn 0.6s ease 1s forwards;
}

@keyframes sideNavFadeIn {
    from { opacity: 0; transform: translateY(-50%) translateX(-20px); }
    to { opacity: 1; transform: translateY(-50%) translateX(0); }
}

.side-nav-track {
    display: none;
}

.side-nav-item {
    display: flex;
    align-items: center;
    gap: 0;
    text-decoration: none;
    position: relative;
    cursor: pointer;
    transition: all 0.25s ease;
    padding: 0.5rem 0;
}

.side-nav-dot {
    display: none;
}

.side-nav-dot::before {
    display: none;
}

.side-nav-label {
    position: relative;
    right: auto;
    white-space: nowrap;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    background: transparent;
    padding: 0.25rem 0;
    padding-left: 1rem;
    border-radius: 0;
    border: none;
    border-left: 2px solid transparent;
    box-shadow: none;
    opacity: 1;
    transform: none;
    transition: all 0.25s ease;
    pointer-events: auto;
}

.side-nav-item:hover .side-nav-label {
    opacity: 1;
    transform: none;
    color: var(--text);
    border-left-color: rgba(37, 99, 235, 0.3);
}

.side-nav-item:hover .side-nav-dot {
    display: none;
}

.side-nav-item:hover .side-nav-dot::before {
    display: none;
}

/* Active state */
.side-nav-item.active .side-nav-dot {
    display: none;
}

.side-nav-item.active .side-nav-dot::before {
    display: none;
}

.side-nav-item.active .side-nav-label {
    color: var(--text);
    font-weight: 600;
    border: none;
    border-left: 2px solid var(--accent);
    position: relative;
}

.side-nav-item.active .side-nav-label::before {
    display: none;
}

/* Hide side nav on mobile/tablet */
@media (max-width: 1200px) {
    .side-nav {
        display: none;
    }
}

/* Navigation */
.nav { 
    position: fixed; 
    top: 0; 
    left: 0; 
    right: 0; 
    z-index: 1000; 
    padding: 1rem 2rem; 
    background: transparent; 
    backdrop-filter: none; 
    border-bottom: none; 
    box-shadow: none;
    transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
}
.nav.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.nav-inner { 
    max-width: 100%; 
    margin: 0; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    position: relative;
}
.nav-icons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}
.nav-icon-link {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-icon-link:hover {
    transform: scale(1.05);
    opacity: 0.85;
}
.nav-icon {
    height: 28px;
    width: auto;
    object-fit: contain;
}
.nav-icon-divider {
    color: rgba(255,255,255,0.5);
    font-size: 1rem;
    font-weight: 300;
    margin: 0 0.15rem;
    transition: color 0.3s;
}
.nav.scrolled .nav-icon-divider {
    color: var(--text-light);
}
.nav-logo { 
    font-family: 'Manrope', sans-serif; 
    font-weight: 800; 
    font-size: 1.5rem; 
    color: #FFFFFF;
    -webkit-text-fill-color: #FFFFFF;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    transition: all 0.3s;
}
.nav.scrolled .nav-logo {
    background: var(--gradient-1); 
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a { 
    color: var(--text-muted); 
    text-decoration: none; 
    font-size: 0.9rem; 
    font-weight: 500; 
    transition: color 0.3s; 
}
.nav-links a:hover { color: var(--accent); }
.nav-cta { display: flex; gap: 1rem; }
.nav-cta .btn { padding: 0.6rem 1.2rem; font-size: 0.85rem; }
.nav .nav-cta .btn-secondary { color: #FFFFFF; border-color: rgba(255,255,255,0.4); }
.nav .nav-cta .btn-primary { background: rgba(255,255,255,0.9); color: var(--accent); }
.nav.scrolled .nav-cta .btn-secondary { color: var(--text); border-color: var(--card-border); }
.nav.scrolled .nav-cta .btn-primary { background: var(--accent); color: #FFFFFF; }

/* Buttons */
.btn { 
    display: inline-flex; 
    align-items: center; 
    gap: 0.5rem; 
    padding: 0.9rem 1.8rem; 
    border-radius: 50px; 
    font-family: 'DM Sans', sans-serif; 
    font-weight: 600; 
    font-size: 0.95rem; 
    text-decoration: none; 
    transition: all 0.3s; 
    cursor: pointer; 
    border: none; 
}
.btn-primary { 
    background: var(--accent); 
    color: #FFFFFF; 
}
.btn-primary:hover { 
    background: var(--accent-hover); 
    transform: translateY(-2px); 
    box-shadow: 0 10px 30px rgba(37,99,235,0.3); 
}
.btn-secondary { 
    background: transparent; 
    color: var(--text); 
    border: 1px solid var(--card-border); 
}
.btn-secondary:hover { 
    background: var(--secondary); 
    border-color: var(--accent); 
    color: var(--accent);
}
.btn-icon { width: 20px; height: 20px; }

/* Hero Section - Video Background */
.hero-video {
    position: relative;
    height: 100vh;
    min-height: 640px;
    overflow: hidden;
    background: #000;
}
.hero-video video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.hero-video::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg, 
        rgba(0,0,0,0.55) 0%, 
        rgba(0,0,0,0.35) 40%, 
        rgba(0,0,0,0.15) 70%, 
        rgba(248,250,252,0.95) 100%
    );
    pointer-events: none;
}
.hero-video-overlay {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-video-content {
    text-align: left;
    max-width: 1200px;
    padding: 0 3rem;
    transform: translateY(-2vh);
}
.hero-badge { 
    display: inline-flex; 
    align-items: center; 
    gap: 0.5rem; 
    padding: 0.5rem 1rem; 
    background: rgba(255,255,255,0.15); 
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3); 
    border-radius: 50px; 
    font-size: 0.85rem; 
    color: #FFFFFF; 
    margin-bottom: 2rem; 
    animation: fadeInUp 0.8s ease forwards; 
}
.hero-badge-dot { 
    width: 8px; 
    height: 8px; 
    background: #FFFFFF; 
    border-radius: 50%; 
    animation: pulse 2s infinite; 
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }

.hero-title { 
    font-family: 'Manrope', sans-serif; 
    font-size: clamp(2.2rem, 5vw, 3.8rem); 
    font-weight: 800; 
    line-height: 1.15; 
    margin-bottom: 1.5rem; 
    animation: fadeInUp 0.8s ease 0.1s forwards; 
    opacity: 0; 
    color: #FFFFFF;
}
.hero-title .highlight { 
    background: linear-gradient(135deg, #60A5FA 0%, #93C5FD 100%);
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
}
.hero-subtitle { 
    font-size: 1.15rem; 
    color: rgba(255,255,255,0.85); 
    max-width: 900px; 
    margin: 0 0 2.5rem; 
    animation: fadeInUp 0.8s ease 0.2s forwards; 
    opacity: 0; 
    line-height: 1.6;
}
.hero-stats { 
    display: flex; 
    gap: 2rem; 
    justify-content: center;
    margin-bottom: 2.5rem; 
    animation: fadeInUp 0.8s ease 0.3s forwards; 
    opacity: 0; 
}
.hero-stat { 
    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(12px);
    padding: 1.2rem 1.8rem;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.2);
}
.hero-stat-value { 
    font-family: 'Manrope', sans-serif; 
    font-size: 2.5rem; 
    font-weight: 800; 
    color: #FFFFFF;
    -webkit-text-fill-color: #FFFFFF;
    background: none;
    -webkit-background-clip: unset;
}
.hero-stat-label { 
    font-size: 0.8rem; 
    color: rgba(255,255,255,0.7); 
    text-transform: uppercase; 
    letter-spacing: 0.1em; 
}
.hero-authors {
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}
.hero-authors-list {
    color: rgba(255,255,255,0.9);
    font-size: 1rem;
    line-height: 1.8;
    font-weight: 500;
}
.hero-authors-list sup {
    font-size: 0.65em;
    color: rgba(255,255,255,0.7);
}
.hero-affiliations {
    margin-top: 0.5rem;
    color: rgba(255,255,255,0.7);
    font-size: 0.85rem;
    line-height: 1.6;
}
.hero-affiliations sup {
    font-size: 0.65em;
}
.hero-notes {
    margin-top: 0.3rem;
    color: rgba(255,255,255,0.55);
    font-size: 0.8rem;
}
.hero-cta { 
    display: flex; 
    gap: 1rem; 
    flex-wrap: wrap; 
    justify-content: flex-start; 
    animation: fadeInUp 0.8s ease 0.4s forwards; 
    opacity: 0; 
}
.hero-cta .btn-primary {
    background: rgba(255,255,255,0.95);
    color: var(--accent);
}
.hero-cta .btn-primary:hover {
    background: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.hero-cta .btn-secondary {
    background: transparent;
    color: #FFFFFF;
    border: 1px solid rgba(255,255,255,0.4);
}
.hero-cta .btn-secondary:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.6);
    color: #FFFFFF;
}

/* Scroll hint */
.hero-scroll-hint {
    position: absolute;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: rgba(255,255,255,0.7);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    pointer-events: none;
}
.hero-chevron {
    width: 14px;
    height: 14px;
    border-right: 2px solid rgba(255,255,255,0.7);
    border-bottom: 2px solid rgba(255,255,255,0.7);
    transform: rotate(45deg);
    animation: chevBob 1.6s ease-in-out infinite;
}
@keyframes chevBob {
    0%, 100% { transform: translateY(0) rotate(45deg); }
    50% { transform: translateY(6px) rotate(45deg); }
}

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

@media (max-width: 820px) {
    .hero-video { min-height: 560px; }
    .hero-title { font-size: clamp(1.6rem, 5vw, 2.5rem); }
    .hero-subtitle { font-size: 1rem; }
    .hero-video-content { padding: 0 1.5rem; }
}
@media (max-width: 500px) {
    .hero-video { min-height: 100vh; min-height: 100svh; }
    .hero-title { font-size: 1.5rem; }
    .hero-subtitle { font-size: 0.9rem; margin-bottom: 1.5rem; }
    .hero-cta { flex-direction: column; align-items: flex-start; }
    .hero-cta .btn { width: 100%; justify-content: center; }
    .hero-video-content { padding: 0 1.2rem; }
}

/* Sections */
.section { padding: 6rem 2rem; }
.section-dark { background: var(--secondary); }
.container { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-label { 
    display: inline-block; 
    font-size: 0.8rem; 
    font-weight: 600; 
    text-transform: uppercase; 
    letter-spacing: 0.15em; 
    color: var(--accent); 
    margin-bottom: 1rem; 
    background: rgba(37,99,235,0.1);
    padding: 0.4rem 1rem;
    border-radius: 20px;
}
.section-title { 
    font-family: 'Manrope', sans-serif; 
    font-size: clamp(2rem, 4vw, 3rem); 
    font-weight: 700; 
    margin-bottom: 1rem; 
    color: var(--text);
}
.section-desc { font-size: 1.1rem; color: var(--text-muted); max-width: 900px; margin: 0 auto; }

/* Pipeline Styles */
.pipeline-wrapper { max-width: 1400px; margin: 0 auto; }
.pipeline { display: flex; align-items: stretch; gap: 0; }
.connector { flex: 0 0 50px; display: flex; align-items: center; justify-content: center; }
.connector-arrow { 
    width: 100%; 
    height: 4px; 
    background: linear-gradient(90deg, rgba(37,99,235,0.3), rgba(37,99,235,0.8), rgba(37,99,235,0.3)); 
    position: relative; 
    border-radius: 2px; 
}
.connector-arrow::after { 
    content: ''; 
    position: absolute; 
    right: -6px; 
    top: 50%; 
    transform: translateY(-50%); 
    border: 5px solid transparent; 
    border-left: 8px solid rgba(37,99,235,0.9); 
}
.connector-arrow .flow-light { 
    position: absolute; 
    top: -2px; 
    left: 0; 
    width: 20px; 
    height: 8px; 
    background: radial-gradient(ellipse, rgba(37,99,235,0.9), transparent); 
    border-radius: 50%; 
    animation: flowMove 1.5s linear infinite; 
}
@keyframes flowMove { 0% { left: -20px; opacity: 0; } 20% { opacity: 1; } 80% { opacity: 1; } 100% { left: calc(100% + 10px); opacity: 0; } }

.input-section { flex: 0 0 200px; display: flex; flex-direction: column; gap: 12px; }
.demo-card { 
    border-radius: 12px; 
    padding: 14px; 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    box-shadow: var(--card-shadow);
}
.demo-card.human { 
    background: linear-gradient(135deg, rgba(16,185,129,0.1) 0%, rgba(16,185,129,0.05) 100%); 
    border: 1px solid rgba(16,185,129,0.25); 
}
.demo-card.robot { 
    background: linear-gradient(135deg, rgba(37,99,235,0.1) 0%, rgba(37,99,235,0.05) 100%); 
    border: 1px solid rgba(37,99,235,0.25); 
}
.demo-card h3 { 
    color: var(--text); 
    font-size: 0.85rem; 
    font-weight: 600; 
    margin-bottom: 4px; 
    display: flex; 
    align-items: center; 
    gap: 6px; 
}
.demo-card h3::before { content: ''; width: 6px; height: 6px; border-radius: 50%; }
.demo-card.human h3::before { background: var(--accent-green); box-shadow: 0 0 6px var(--accent-green); }
.demo-card.robot h3::before { background: var(--accent); box-shadow: 0 0 6px var(--accent); }
.demo-subtitle { color: var(--text-muted); font-size: 0.7rem; margin-bottom: 10px; }
.image-placeholder { 
    width: 100%; 
    flex: 1; 
    min-height: 70px; 
    background: linear-gradient(135deg, rgba(37,99,235,0.05), rgba(37,99,235,0.02)); 
    border-radius: 8px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    color: var(--text-muted); 
    font-size: 0.7rem; 
    border: 1px dashed rgba(37,99,235,0.2); 
}

/* View Alignment */
.view-alignment { 
    flex: 1; 
    max-width: 420px; 
    background: linear-gradient(135deg, rgba(16,185,129,0.08) 0%, rgba(16,185,129,0.03) 100%); 
    border: 1px solid rgba(16,185,129,0.2); 
    border-radius: 14px; 
    padding: 18px; 
    box-shadow: var(--card-shadow);
}
.pipeline-section-title { color: var(--text); font-size: 1rem; text-align: center; margin-bottom: 14px; font-weight: 600; }
.pipeline-section-title span { color: var(--accent-green); }
.process-loop { 
    display: grid; 
    grid-template-columns: 1fr 30px 1fr; 
    grid-template-rows: 1fr 24px 1fr; 
    gap: 6px; 
    height: calc(100% - 40px); 
    min-height: 220px; 
}
.process-item { 
    background: rgba(255,255,255,0.8); 
    border-radius: 8px; 
    padding: 10px; 
    display: flex; 
    flex-direction: column; 
    border: 1px solid rgba(16,185,129,0.15); 
}
.process-label { color: var(--text-muted); font-size: 0.7rem; margin-bottom: 6px; text-align: center; }
.process-item .image-placeholder { flex: 1; min-height: 60px; }
.item-tl { grid-column: 1; grid-row: 1; }
.item-tr { grid-column: 3; grid-row: 1; }
.item-bl { grid-column: 1; grid-row: 3; }
.item-br { grid-column: 3; grid-row: 3; }
.loop-arrow { display: flex; align-items: center; justify-content: center; color: var(--accent-green); }
.loop-arrow svg { width: 18px; height: 18px; stroke: var(--accent-green); fill: none; stroke-width: 2.5; opacity: 0.8; }
.arrow-left { grid-column: 1; grid-row: 2; }
.arrow-bottom { grid-column: 2; grid-row: 3; }
.arrow-right { grid-column: 3; grid-row: 2; }
.empty-center { grid-column: 2; grid-row: 2; }
.empty-top { grid-column: 2; grid-row: 1; }
.arrow-down svg { animation: bounceDown 1.8s ease infinite; }
.arrow-right-dir svg { animation: bounceRight 1.8s ease infinite; }
.arrow-up svg { animation: bounceUp 1.8s ease infinite; }
@keyframes bounceDown { 0%, 100% { transform: translateY(0); opacity: 0.6; } 50% { transform: translateY(3px); opacity: 1; } }
@keyframes bounceRight { 0%, 100% { transform: translateX(0); opacity: 0.6; } 50% { transform: translateX(3px); opacity: 1; } }
@keyframes bounceUp { 0%, 100% { transform: translateY(0); opacity: 0.6; } 50% { transform: translateY(-3px); opacity: 1; } }

/* Action Alignment */
.action-alignment { 
    flex: 1; 
    max-width: 420px; 
    background: linear-gradient(135deg, rgba(139,92,246,0.08) 0%, rgba(139,92,246,0.03) 100%); 
    border: 1px solid rgba(139,92,246,0.2); 
    border-radius: 14px; 
    padding: 18px; 
    display: flex; 
    flex-direction: column; 
    box-shadow: var(--card-shadow);
}
.action-alignment .pipeline-section-title span { color: var(--accent-purple); }
.unified-badge { 
    background: linear-gradient(90deg, var(--accent), var(--accent-light)); 
    color: #FFFFFF; 
    font-size: 0.65rem; 
    font-weight: 600; 
    padding: 4px 12px; 
    border-radius: 10px; 
    display: inline-block; 
    margin: 0 auto 12px; 
}
.action-grid { display: flex; flex-direction: column; gap: 8px; flex: 1; }
.action-row { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
    background: rgba(255,255,255,0.8); 
    border-radius: 10px; 
    padding: 12px; 
    flex: 1; 
    border: 1px solid rgba(139,92,246,0.15); 
}
.body-part { flex: 0 0 70px; text-align: center; }
.body-icon { 
    width: 40px; 
    height: 40px; 
    margin: 0 auto 4px; 
    background: rgba(139,92,246,0.12); 
    border-radius: 10px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    border: 1px solid rgba(139,92,246,0.2); 
}
.body-icon .emoji { font-size: 1.3rem; }
.body-name { color: var(--text-muted); font-size: 0.65rem; }
.flow-arrow-action { color: var(--accent-purple); font-size: 1rem; opacity: 0.6; }
.action-output { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.action-title { color: var(--text); font-size: 0.8rem; font-weight: 500; }
.action-icons-row { display: flex; gap: 5px; flex-wrap: wrap; }
.action-icon-item { 
    width: 32px; 
    height: 32px; 
    background: rgba(139,92,246,0.1); 
    border: 1px solid rgba(139,92,246,0.2); 
    border-radius: 6px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    font-size: 0.7rem; 
    color: var(--accent-purple); 
    font-weight: 600; 
}
.binary-icons { display: flex; gap: 12px; align-items: center; }
.binary-icon { 
    width: 40px; 
    height: 40px; 
    background: rgba(139,92,246,0.1); 
    border: 1px solid rgba(139,92,246,0.25); 
    border-radius: 8px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    font-size: 1.4rem; 
}
.binary-label { font-size: 0.65rem; color: var(--text-muted); margin-top: 2px; text-align: center; }
.binary-divider { color: var(--text-muted); font-size: 0.8rem; }

/* Task Blocks */
.task-block { margin-bottom: 4rem; }
.task-block-header { 
    display: flex; 
    align-items: center; 
    gap: 1rem; 
    margin-bottom: 2rem; 
    padding-bottom: 1rem; 
    border-bottom: 1px solid var(--card-border); 
}
.task-block-icon { width: 50px; height: 50px; border-radius: 12px; display: flex; align-items: center; justify-content: center; }
.task-block-icon svg { width: 26px; height: 26px; }
.task-block-icon.robot-icon { background: rgba(37,99,235,0.15); color: var(--accent); }
.task-block-icon.human-icon { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.task-block-icon.deploy-icon { background: rgba(249,115,22,0.15); color: var(--accent-orange); }
.task-block-title { font-family: 'Manrope', sans-serif; font-size: 1.5rem; font-weight: 700; color: var(--text); }
.task-block-subtitle { font-size: 0.9rem; color: var(--text-muted); }

.task-video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.task-video-card { 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 16px; 
    overflow: hidden; 
    transition: all 0.3s; 
    box-shadow: var(--card-shadow);
}
.task-video-card:hover { 
    transform: translateY(-5px); 
    border-color: rgba(37,99,235,0.3); 
    box-shadow: 0 8px 32px rgba(37,99,235,0.15);
}
.task-video-placeholder { 
    aspect-ratio: 16/9; 
    background: linear-gradient(135deg, rgba(37,99,235,0.1) 0%, rgba(37,99,235,0.05) 100%); 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    overflow: hidden;
    color: var(--text-muted); 
    font-size: 0.9rem; 
    position: relative; 
}
.task-video-placeholder.human { 
    background: linear-gradient(135deg, rgba(16,185,129,0.1) 0%, rgba(16,185,129,0.05) 100%); 
}
.task-video-badge { 
    position: absolute; 
    top: 10px; 
    right: 10px; 
    background: rgba(37,99,235,0.9); 
    color: #FFFFFF;
    padding: 0.25rem 0.6rem; 
    border-radius: 20px; 
    font-size: 0.7rem; 
    font-weight: 500;
}
.task-video-placeholder.human .task-video-badge {
    background: rgba(16,185,129,0.9);
}
.task-video-placeholder video, .deploy-video-placeholder video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.task-video-title { padding: 1rem; font-weight: 600; text-align: center; font-size: 0.9rem; color: var(--text); }

/* Deploy Tabs */
.deploy-tabs { display: flex; justify-content: center; gap: 1rem; margin-bottom: 2rem; flex-wrap: wrap; }
.deploy-tab { 
    padding: 0.7rem 1.3rem; 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 50px; 
    color: var(--text-muted); 
    font-family: 'DM Sans', sans-serif; 
    font-size: 0.85rem; 
    cursor: pointer; 
    transition: all 0.3s; 
}
.deploy-tab:hover { border-color: var(--accent); color: var(--accent); }
.deploy-tab.active { background: var(--accent); border-color: var(--accent); color: #FFFFFF; }
.deploy-content { display: none; }
.deploy-content.active { display: block; animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.deploy-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.deploy-card { 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 16px; 
    overflow: hidden; 
    transition: all 0.3s; 
    box-shadow: var(--card-shadow);
}
.deploy-card:hover { transform: translateY(-5px); box-shadow: 0 8px 32px rgba(37,99,235,0.15); }
.deploy-card.highlight { border-color: var(--accent); box-shadow: 0 8px 32px rgba(37,99,235,0.2); }
.deploy-video-placeholder { width: 100%; aspect-ratio: 16/9; display: block; color: var(--text-muted); overflow: hidden; position: relative; }
.deploy-video-placeholder.robot-only { background: linear-gradient(135deg, rgba(37,99,235,0.1) 0%, rgba(37,99,235,0.05) 100%); }
.deploy-video-placeholder.human-only { background: linear-gradient(135deg, rgba(249,115,22,0.1) 0%, rgba(249,115,22,0.05) 100%); }
.deploy-video-placeholder.cotrain { background: linear-gradient(135deg, rgba(16,185,129,0.15) 0%, rgba(16,185,129,0.08) 100%); }
.deploy-card-footer { 
    padding: 1rem; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border-top: 1px solid var(--card-border); 
    background: var(--secondary);
}
.deploy-card-title { font-weight: 600; font-size: 0.9rem; color: var(--text); }
.deploy-card-score { font-size: 0.8rem; font-weight: 700; padding: 0.3rem 0.7rem; border-radius: 20px; }
.deploy-card-score.success { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.deploy-card-score.warning { background: rgba(249,115,22,0.15); color: var(--accent-orange); }
.deploy-card-score.danger { background: rgba(239,68,68,0.15); color: #EF4444; }

/* Performance Charts */
.performance-container { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.chart-card { 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 20px; 
    padding: 2rem; 
    box-shadow: var(--card-shadow);
}
.chart-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1.5rem; }
.chart-title { font-family: 'Manrope', sans-serif; font-size: 1.2rem; font-weight: 700; color: var(--text); }
.chart-subtitle { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.25rem; }
.chart-legend { display: flex; gap: 1rem; }
.legend-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8rem; color: var(--text-muted); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; }
.legend-dot.robot { background: var(--accent); }
.legend-dot.cotrain { background: var(--accent-green); }
.chart-wrapper { height: 300px; }

/* Subtask Table */
.table-container { 
    overflow-x: auto; 
    border-radius: 16px; 
    border: 1px solid var(--card-border); 
    box-shadow: var(--card-shadow);
}
.subtask-table { width: 100%; border-collapse: collapse; background: var(--card-bg); }
.subtask-table th, .subtask-table td { 
    padding: 1rem; 
    text-align: center; 
    border-bottom: 1px solid var(--card-border); 
}
.subtask-table th { 
    background: var(--secondary); 
    font-weight: 600; 
    font-size: 0.8rem; 
    text-transform: uppercase; 
    color: var(--text-muted); 
}
.subtask-table th:first-child, .subtask-table td:first-child { text-align: left; }
.subtask-table tr:last-child td { border-bottom: none; }
.subtask-table tbody tr:hover { background: rgba(37,99,235,0.05); }
.subtask-table tbody tr.highlight-row { background: rgba(16, 185, 129, 0.1); }
.subtask-table tbody tr.highlight-row:hover { background: rgba(16, 185, 129, 0.15); }
.subtask-table td:first-child { color: var(--text); font-weight: 500; }
.cell-success { color: var(--accent-green); font-weight: 600; }
.cell-warning { color: #8B5CF6; font-weight: 600; }
.cell-danger { color: #EF4444; font-weight: 600; }
.cell-loco { background: rgba(37,99,235,0.08); }
.cell-manip { background: rgba(249,115,22,0.08); }
.subtask-header-row th { background: var(--card-bg); }
th.cell-loco { color: var(--accent); font-weight: 700; font-size: 0.95rem; }
th.cell-manip { color: var(--accent-orange); font-weight: 700; font-size: 0.95rem; }
.table-legend { display: flex; gap: 2rem; margin-top: 1.5rem; justify-content: center; }

/* Sankey/Failure Analysis */
.sankey-container { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.sankey-card { 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 16px; 
    padding: 1.5rem; 
    box-shadow: var(--card-shadow);
}
.sankey-card svg { width: 100%; height: auto; display: block; }
.sankey-title { 
    font-family: 'Manrope', sans-serif; 
    font-weight: 700; 
    margin-bottom: 1rem; 
    padding-bottom: 1rem; 
    border-bottom: 1px solid var(--card-border);
    text-align: center; 
    color: var(--text);
}

/* Scaling Analysis */
.scaling-legend-wrapper {
    display: flex;
    justify-content: center;
    width: 100%;
    margin: 0 auto 2rem;
}
.scaling-legend-wrapper > .scaling-legend {
    display: inline-flex;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.scaling-legend {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin-bottom: 0;
}
.scaling-legend-label {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-right: 0.5rem;
    letter-spacing: 0.02em;
}
.scaling-legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}
.scaling-legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.scaling-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}
.scaling-chart-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1rem;
    box-shadow: var(--card-shadow);
}
.scaling-chart-title {
    font-family: 'Manrope', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text);
    text-align: center;
    margin-bottom: 0.75rem;
}
.scaling-chart-card canvas {
    width: 100% !important;
    aspect-ratio: 1 / 1;
}

@media (max-width: 1200px) {
    .scaling-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 768px) {
    .scaling-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .scaling-legend {
        gap: 1.5rem;
    }
    .scaling-legend-wrapper > .scaling-legend {
        padding: 0.875rem 1.25rem;
    }
}
@media (max-width: 500px) {
    .scaling-legend-wrapper > .scaling-legend {
        padding: 0.75rem 1rem;
    }
    .scaling-legend {
        gap: 1rem;
    }
    .scaling-grid {
        grid-template-columns: 1fr;
        max-width: 300px;
        margin: 0 auto;
    }
}

/* Abstract Section */
.abstract-container { display: flex; flex-direction: column; gap: 2rem; }
.abstract-text { 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 20px; 
    padding: 2.5rem; 
    box-shadow: var(--card-shadow);
}
.abstract-text p { color: var(--text-muted); margin-bottom: 1.5rem; line-height: 1.8; }
.abstract-text .highlight-text { 
    color: var(--text); 
    background: linear-gradient(180deg, transparent 60%, rgba(37,99,235,0.2) 60%); 
}
.abstract-text strong { color: var(--accent); }
.contributions-sidebar { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
/* PLY Viewer */
#plyContainer {
    background: #f0f0f0;
    border: none !important;
}
#plyCanvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}
.ply-hint {
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.5);
    font-size: 0.55rem;
    pointer-events: none;
    white-space: nowrap;
}

.abstract-video {
    margin-top: 2.5rem;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
}
.abstract-video video {
    width: 100%;
    display: block;
    border-radius: 16px;
}
.contribution-card-mini { 
    padding: 1.5rem; 
    background: var(--card-bg); 
    border: 1px solid var(--card-border); 
    border-radius: 16px; 
    box-shadow: var(--card-shadow);
}
.contribution-icon-mini { 
    width: 40px; 
    height: 40px; 
    background: rgba(37,99,235,0.1); 
    border-radius: 10px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    margin-bottom: 1rem; 
}
.contribution-icon-mini svg { width: 20px; height: 20px; color: var(--accent); }
.contribution-card-mini h4 { font-family: 'Manrope', sans-serif; font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--text); }
.contribution-card-mini p { font-size: 0.85rem; color: var(--text-muted); }

/* Citation Box */
.citation-box { 
    background: var(--secondary); 
    border: 1px solid var(--card-border); 
    border-radius: 16px; 
    padding: 1.5rem; 
    margin-top: 2rem; 
}
.citation-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.citation-title { font-weight: 600; display: flex; align-items: center; gap: 0.5rem; color: var(--text); }
.citation-copy { 
    padding: 0.5rem 1rem; 
    background: var(--accent); 
    color: #FFFFFF; 
    border: none; 
    border-radius: 8px; 
    font-family: 'DM Sans', sans-serif; 
    font-size: 0.85rem; 
    font-weight: 600; 
    cursor: pointer; 
    transition: all 0.3s;
}
.citation-copy:hover { background: var(--accent-hover); }
.citation-copy.copied {
    background: #FFFFFF;
    color: var(--accent);
    border: 1.5px solid var(--accent);
}
.citation-code { 
    background: #1E293B; 
    border-radius: 8px; 
    padding: 1rem; 
    font-family: 'JetBrains Mono', monospace; 
    font-size: 0.8rem; 
    color: #94A3B8; 
    overflow-x: auto; 
    white-space: pre; 
}

/* Footer */
.footer { 
    padding: 4rem 2rem; 
    background: var(--secondary); 
    border-top: 1px solid var(--card-border); 
}
.footer-inner { 
    max-width: 1200px; 
    margin: 0 auto; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
}
.footer-logo { 
    font-family: 'Manrope', sans-serif; 
    font-weight: 800; 
    font-size: 1.5rem; 
    background: var(--gradient-1); 
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
}
.footer-text { color: var(--text-muted); font-size: 0.9rem; }
.footer-links { display: flex; gap: 2rem; }
.footer-links a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; transition: color 0.3s; }
.footer-links a:hover { color: var(--accent); }

/* Reveal Animation */
.reveal { opacity: 0; transform: translateY(40px); transition: all 0.8s; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1100px) {
    .pipeline { flex-direction: column; align-items: center; gap: 20px; }
    .connector { transform: rotate(90deg); flex: 0 0 40px; }
    .input-section { flex-direction: row; width: 100%; max-width: 500px; }
    .view-alignment, .action-alignment { max-width: 500px; width: 100%; }
}
@media (max-width: 1024px) {
    .performance-container { grid-template-columns: 1fr; }
    .contributions-sidebar { grid-template-columns: 1fr; }
    .sankey-container { grid-template-columns: 1fr; }
    .task-video-grid { grid-template-columns: repeat(2, 1fr); }
    .deploy-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav { padding: 0.75rem 1rem; }
    .nav-logo { display: 1.1rem; }
    .nav-icon { height: 22px; }
    .nav-cta .btn { padding: 0.5rem 0.8rem; font-size: 0.75rem; }
    .nav-cta { gap: 0.5rem; }
    .nav-links { display: none; }
    .section { padding: 3rem 1rem; }
    .section-header { margin-bottom: 2rem; }
    .section-title { font-size: 1.5rem; }
    .section-desc { font-size: 0.9rem; }
    .abstract-text { padding: 1.5rem; }
    .footer-inner { flex-direction: column; gap: 1.5rem; text-align: center; }
    .task-video-grid { grid-template-columns: 1fr; }
    .input-section { flex-direction: column; }
    .deploy-tabs { gap: 0.5rem; }
    .deploy-tab { padding: 0.5rem 0.8rem; font-size: 0.75rem; }
    .chart-card { padding: 1rem; }
    .chart-wrapper { height: 220px; }
    .table-container { font-size: 0.75rem; }
    .subtask-table th, .subtask-table td { padding: 0.5rem 0.3rem; font-size: 0.7rem; }
    .sankey-container { grid-template-columns: 1fr; }
    .contribution-card-mini { padding: 1rem; }
    .contribution-card-mini h4 { font-size: 0.9rem; }
    .contribution-card-mini p { font-size: 0.8rem; }
    .footer-links { gap: 1rem; flex-wrap: wrap; justify-content: center; }
}
@media (max-width: 500px) {
    .nav-icon-divider { display: none; }
    .nav-icons { gap: 0.3rem; }
    .contributions-sidebar { grid-template-columns: 1fr; }
}