/* ============================================================
   Industrial3D — "Industrial Blueprint" Design System
   Dark navy + cyan blueprint grid + Playfair Display serif
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300;1,9..40,400&family=JetBrains+Mono:wght@300;400;500;600&display=swap');

/* ── Custom Properties ─────────────────────────────────────── */
:root,
[data-theme="dark"] {
  --bg-primary:    #07091a;
  --bg-surface:    #0c1124;
  --bg-elevated:   #12192e;
  --bg-card:       #0f1628;
  --border-faint:  #151f38;
  --border:        #1c2d4e;
  --border-bright: #2a4070;
  --accent:        #00c8ff;
  --accent-dim:    rgba(0, 200, 255, 0.10);
  --accent-bright: #40dcff;
  --accent-glow:   rgba(0, 200, 255, 0.20);
  --accent-2:      #64ffda;
  --warning:       #f5b52a;
  --warning-dim:   rgba(245, 181, 42, 0.12);
  --success:       #4ade80;
  --danger:        #f87171;
  --text-primary:  #d4e8ff;
  --text-secondary:#7a9ec8;
  --text-muted:    #3a5070;
  --text-inverse:  #07091a;
  --grid-color:    rgba(0, 200, 255, 0.032);
  --grid-size:     60px;
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.5);
  --shadow-md:     0 4px 16px rgba(0,0,0,0.6);
  --shadow-lg:     0 12px 40px rgba(0,0,0,0.7);
  --shadow-accent: 0 0 24px rgba(0, 200, 255, 0.15);
  --radius-sm:     4px;
  --radius:        8px;
  --radius-lg:     14px;
  --radius-xl:     20px;
  --nav-height:    64px;
  --transition:    200ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary:    #eef2fa;
  --bg-surface:    #ffffff;
  --bg-elevated:   #f4f7fd;
  --bg-card:       #ffffff;
  --border-faint:  #e0e8f5;
  --border:        #ccd8ee;
  --border-bright: #a8c0de;
  --accent:        #0073a8;
  --accent-dim:    rgba(0, 115, 168, 0.08);
  --accent-bright: #005a84;
  --accent-glow:   rgba(0, 115, 168, 0.16);
  --accent-2:      #006b50;
  --warning:       #b86f00;
  --warning-dim:   rgba(184, 111, 0, 0.10);
  --success:       #166534;
  --danger:        #c0392b;
  --text-primary:  #07101e;
  --text-secondary:#3a5070;
  --text-muted:    #7a90aa;
  --text-inverse:  #ffffff;
  --grid-color:    rgba(0, 80, 160, 0.05);
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

/* ── Base ───────────────────────────────────────────────────── */
body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  min-height: 100vh;
  transition: background-color var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition), opacity var(--transition); }
a:hover { color: var(--accent-bright); }

img { max-width: 100%; height: auto; display: block; }
video { max-width: 100%; display: block; }

ul, ol { list-style: none; }

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: 'Playfair Display', Georgia, 'Times New Roman', serif;
  line-height: 1.2;
  color: var(--text-primary);
  font-weight: 600;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
h4 { font-size: 1.1rem; font-weight: 600; font-family: 'DM Sans', sans-serif; }

p { max-width: 72ch; }

.mono, code, pre, .stat-value, .miou-cell, td.mono {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
}

code {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.4em;
  font-size: 0.875em;
  color: var(--accent);
}

pre {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-primary);
  position: relative;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

/* ── Layout Utilities ───────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section--tight {
  padding: 3rem 0;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 60ch;
  margin-bottom: 3rem;
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }

/* ── Navigation ─────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 9, 26, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-faint);
  height: var(--nav-height);
}

[data-theme="light"] .site-header {
  background: rgba(238, 242, 250, 0.88);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.brand-link:hover { color: var(--accent); }

.brand-icon {
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
}

.brand-name {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  justify-content: center;
}

.nav-link {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition), background-color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0.85rem;
  right: 0.85rem;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--accent-dim);
}

.nav-link.active {
  color: var(--accent);
}

.nav-link.active::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: border-color var(--transition), color var(--transition), background-color var(--transition);
  font-size: 0.95rem;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: none; }

.btn-github {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.btn-github:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn-github svg { width: 16px; height: 16px; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ── Status Banner ──────────────────────────────────────────── */
.status-banner {
  background: var(--warning-dim);
  border: 1px solid rgba(245, 181, 42, 0.3);
  border-radius: var(--radius);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--warning);
  margin-bottom: 2rem;
}

.status-banner-icon { font-size: 1rem; flex-shrink: 0; }
.status-banner a { color: var(--warning); text-decoration: underline; }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--text-inverse);
}

.btn-primary:hover {
  background: var(--accent-bright);
  color: var(--text-inverse);
  box-shadow: var(--shadow-accent);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn-sm {
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
}

.btn-copy {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-copy:hover { border-color: var(--accent); color: var(--accent); }
.btn-copy.copied { color: var(--success); border-color: var(--success); }

/* ── Hero Section ───────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 4rem) 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(0, 200, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--warning-dim);
  border: 1px solid rgba(245, 181, 42, 0.35);
  color: var(--warning);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  width: fit-content;
}

.hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 400;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  font-style: italic;
  font-weight: 700;
  line-height: 1.05;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--text-primary) 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 52ch;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.hero-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  box-shadow: var(--shadow-lg);
}

.hero-image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(0, 200, 255, 0.06) 100%);
  z-index: 1;
  pointer-events: none;
}

.hero-image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Stats Strip ─────────────────────────────────────────────── */
.stats-strip {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-faint);
  border-bottom: 1px solid var(--border-faint);
  padding: 2rem 0;
  overflow-x: auto;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(7, auto);
  gap: 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  min-width: 700px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 1.5rem;
  position: relative;
}

.stat-item + .stat-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10%;
  height: 80%;
  width: 1px;
  background: var(--border-faint);
}

.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ── Cards ───────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-md);
}

.card--accent {
  border-color: rgba(0, 200, 255, 0.25);
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 200, 255, 0.03) 100%);
}

.card--accent:hover {
  border-color: rgba(0, 200, 255, 0.45);
  box-shadow: var(--shadow-accent);
}

/* ── Abstract Section ────────────────────────────────────────── */
.abstract-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 80ch;
  border-left: 2px solid var(--accent);
  padding-left: 1.5rem;
  font-style: italic;
}

/* ── Dual Crisis ─────────────────────────────────────────────── */
.dual-crisis {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

.crisis-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.crisis-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.crisis-number {
  font-family: 'Playfair Display', serif;
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

.crisis-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-family: 'DM Sans', sans-serif;
}

.crisis-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Authors ─────────────────────────────────────────────────── */
.authors-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.author-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border-faint);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  font-size: 0.875rem;
  line-height: 1.4;
  transition: border-color var(--transition);
}

.author-item:hover { border-color: var(--accent); }

.author-name { font-weight: 600; color: var(--text-primary); }
.author-affil { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.15rem; }
.author-item.corresponding .author-name::after {
  content: " ✉";
  color: var(--accent);
  font-size: 0.85em;
}

/* ── Class Taxonomy ──────────────────────────────────────────── */
.tier-group { margin-bottom: 2.5rem; }

.tier-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-faint);
}

.tier-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  text-transform: uppercase;
}

.tier-1 .tier-badge { background: rgba(248, 113, 113, 0.15); color: #f87171; border: 1px solid rgba(248, 113, 113, 0.3); }
.tier-2 .tier-badge { background: rgba(250, 204, 21, 0.12); color: #facc15; border: 1px solid rgba(250, 204, 21, 0.25); }
.tier-3 .tier-badge { background: rgba(100, 255, 218, 0.10); color: var(--accent-2); border: 1px solid rgba(100, 255, 218, 0.2); }

.tier-pct {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.classes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.class-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-faint);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition);
}

.class-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-1px);
}

.class-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
}

.class-info { min-width: 0; }

.class-name {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.class-abbr {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.class-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  line-height: 1.4;
}

/* ── Statistics / Figures ────────────────────────────────────── */
.figure-block {
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.figure-block img {
  width: 100%;
  height: auto;
  display: block;
}

.figure-caption {
  padding: 0.85rem 1.25rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-faint);
  font-style: italic;
}

/* ── Video Gallery ───────────────────────────────────────────── */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.video-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--shadow-md);
}

.video-wrapper {
  position: relative;
  aspect-ratio: 16/9;
  background: #000;
  overflow: hidden;
}

.video-wrapper video,
.video-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-tag {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  z-index: 2;
}

.video-tag.train { background: rgba(74, 222, 128, 0.85); color: #052a10; }
.video-tag.test  { background: rgba(248, 113, 113, 0.85); color: #2a0505; }

.video-meta {
  padding: 1rem 1.25rem;
}

.video-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.video-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Data Split Table ────────────────────────────────────────── */
.split-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-faint);
}

.split-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.split-table th {
  background: var(--bg-elevated);
  padding: 0.75rem 1rem;
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.split-table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border-faint);
  color: var(--text-secondary);
}

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

.split-table tr:hover td { background: var(--accent-dim); }

.split-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
}

.split-train { background: rgba(74, 222, 128, 0.12); color: var(--success); }
.split-val   { background: rgba(250, 204, 21, 0.10); color: var(--warning); }
.split-test  { background: rgba(248, 113, 113, 0.12); color: var(--danger); }

/* ── Download ────────────────────────────────────────────────── */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.download-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.download-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
}

.download-icon {
  font-size: 2rem;
  line-height: 1;
}

.download-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.download-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
}

/* ── Leaderboard ─────────────────────────────────────────────── */
.lb-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.lb-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.35rem 1rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: none;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-inverse);
}

.lb-sort-info {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.lb-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-faint);
}

.lb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.lb-table th {
  background: var(--bg-elevated);
  padding: 0.85rem 1rem;
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition), background-color var(--transition);
}

.lb-table th:hover { color: var(--text-primary); background: var(--bg-card); }
.lb-table th.sorted-asc::after { content: " ↑"; color: var(--accent); }
.lb-table th.sorted-desc::after { content: " ↓"; color: var(--accent); }
.lb-table th.sorted-asc, .lb-table th.sorted-desc { color: var(--accent); }

.lb-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-faint);
  color: var(--text-secondary);
  white-space: nowrap;
}

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

.lb-table tr:hover td { background: var(--accent-dim); }

.lb-table .rank-cell {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  width: 40px;
  text-align: center;
}

.lb-table .method-cell { color: var(--text-primary); font-weight: 600; }
.lb-table .method-cell a { color: inherit; }
.lb-table .method-cell a:hover { color: var(--accent); }

.lb-table .miou-cell {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 1rem;
  text-align: right;
}

.paradigm-pill {
  display: inline-flex;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  white-space: nowrap;
}

.paradigm-full   { background: rgba(0, 200, 255, 0.12); color: var(--accent); border: 1px solid rgba(0,200,255,0.2); }
.paradigm-weak   { background: rgba(100, 255, 218, 0.10); color: var(--accent-2); border: 1px solid rgba(100,255,218,0.2); }
.paradigm-unsup  { background: rgba(250, 204, 21, 0.10); color: var(--warning); border: 1px solid rgba(250,204,21,0.2); }
.paradigm-found  { background: rgba(248, 113, 113, 0.10); color: var(--danger); border: 1px solid rgba(248,113,113,0.2); }

.verified-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.7rem;
  color: var(--success);
  background: rgba(74, 222, 128, 0.10);
  border: 1px solid rgba(74,222,128,0.2);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
}

.code-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent);
  opacity: 0.7;
  transition: opacity var(--transition);
}
.code-link:hover { opacity: 1; color: var(--accent); }

/* Per-class table */
.perclass-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-faint);
  margin-top: 2rem;
}

.perclass-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.perclass-table th {
  background: var(--bg-elevated);
  padding: 0.6rem 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  text-align: right;
}

.perclass-table th:first-child,
.perclass-table th:nth-child(2) { text-align: left; }

.perclass-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-faint);
  color: var(--text-secondary);
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
}

.perclass-table td:first-child,
.perclass-table td:nth-child(2) {
  text-align: left;
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  color: var(--text-primary);
}

.perclass-table tr:last-child td { border-bottom: none; }
.perclass-table tr:hover td { background: var(--accent-dim); }

.zero-iou { color: var(--text-muted) !important; }
.best-iou  { color: var(--accent) !important; font-weight: 600; }

/* ── Gap Analysis Box ───────────────────────────────────────── */
.gap-callout {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: center;
  margin-top: 2rem;
}

.gap-number {
  font-family: 'Playfair Display', serif;
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--danger);
  line-height: 1;
  font-style: italic;
  white-space: nowrap;
}

.gap-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.gap-desc strong { color: var(--text-primary); }

/* ── Submit / Steps ──────────────────────────────────────────── */
.steps {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 1.25rem;
  align-items: start;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
  flex-shrink: 0;
  transition: background-color var(--transition), border-color var(--transition);
}

.step:hover .step-num {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.step-content h4 {
  margin-bottom: 0.35rem;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.step-content p, .step-content ul {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.step-content ul { list-style: disc; padding-left: 1.25rem; margin-top: 0.35rem; }

/* ── Citation blocks ─────────────────────────────────────────── */
.citation-blocks {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.citation-block {
  position: relative;
}

.citation-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* ── Protocol Box ────────────────────────────────────────────── */
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.protocol-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border-faint);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.protocol-key {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.protocol-value {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.protocol-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ── JSON Schema Box ─────────────────────────────────────────── */
.schema-box {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 1rem;
}

.schema-header {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.schema-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.schema-body {
  padding: 1.25rem;
}

.schema-body pre {
  border: none;
  background: none;
  padding: 0;
  margin: 0;
}

/* ── Page Hero ───────────────────────────────────────────────── */
.page-hero {
  padding: calc(var(--nav-height) + 3rem) 0 3rem;
  background: linear-gradient(180deg, var(--bg-surface) 0%, transparent 100%);
  border-bottom: 1px solid var(--border-faint);
  margin-bottom: 0;
}

.page-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.75rem;
}

.page-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 56ch;
  line-height: 1.65;
}

/* ── Footer ──────────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-faint);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand .brand-link {
  margin-bottom: 0.75rem;
  display: inline-flex;
}

.footer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 36ch;
}

.footer-col-title {
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer-link:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border-faint);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border-faint);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pulse-accent {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 200, 255, 0); }
  50%       { box-shadow: 0 0 0 6px rgba(0, 200, 255, 0.12); }
}

.animate-in { animation: fadeInUp 0.5s ease forwards; }
.delay-1 { animation-delay: 0.1s; opacity: 0; }
.delay-2 { animation-delay: 0.2s; opacity: 0; }
.delay-3 { animation-delay: 0.3s; opacity: 0; }
.delay-4 { animation-delay: 0.4s; opacity: 0; }
.delay-5 { animation-delay: 0.5s; opacity: 0; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-image-wrapper {
    order: -1;
    max-height: 300px;
    overflow: hidden;
  }

  .hero-image-wrapper img { object-fit: cover; width: 100%; height: 300px; }

  .dual-crisis { grid-template-columns: 1fr; }

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

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

  .gap-callout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    align-items: flex-start;
    z-index: 99;
  }

  .nav-links.open { display: flex; }

  .nav-link { width: 100%; padding: 0.6rem 0.85rem; }
  .nav-link::after { display: none; }

  .nav-hamburger { display: flex; }

  .btn-github span { display: none; }

  .stats-grid {
    grid-template-columns: repeat(4, auto);
    overflow-x: auto;
  }

  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }

  .lb-controls { flex-direction: column; align-items: flex-start; }

  .section { padding: 3.5rem 0; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); min-width: 0; }
  .stat-item + .stat-item::before { display: none; }
  .stat-item { padding: 1rem 0.5rem; }
}

/* ── Misc utilities ──────────────────────────────────────────── */
.text-accent   { color: var(--accent); }
.text-muted    { color: var(--text-muted); }
.text-warning  { color: var(--warning); }
.text-success  { color: var(--success); }
.text-danger   { color: var(--danger); }
.font-mono     { font-family: 'JetBrains Mono', monospace; }

.divider {
  border: none;
  border-top: 1px solid var(--border-faint);
  margin: 3rem 0;
}

.inline-link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(0, 200, 255, 0.35);
  text-underline-offset: 3px;
}

.inline-link:hover {
  text-decoration-color: var(--accent);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.miou-bar-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.miou-bar {
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.7;
  min-width: 4px;
}

/* ── Zoomable media (figures + videos) ───────────────────────── */
.zoomable { cursor: zoom-in; }

.figure-block { position: relative; }

.zoom-hint {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  background: rgba(7, 9, 26, 0.72);
  border: 1px solid var(--border-bright);
  border-radius: 100px;
  padding: 0.25rem 0.65rem;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
  backdrop-filter: blur(6px);
}

.figure-block:hover .zoom-hint,
.video-card:hover .zoom-hint { opacity: 1; transform: translateY(0); }

/* Caption holding a hint shouldn't collide */
.figure-block .figure-caption { position: relative; z-index: 1; }

/* ── Lightbox ────────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  padding: 3rem 1.5rem;
  background: rgba(3, 5, 14, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 220ms ease, visibility 220ms ease;
}

.lightbox.open { opacity: 1; visibility: visible; }

.lightbox-stage {
  max-width: min(1400px, 94vw);
  max-height: 82vh;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-bright);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.7);
  transform: scale(0.97);
  transition: transform 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

.lightbox.open .lightbox-stage { transform: scale(1); }

.lightbox-stage img,
.lightbox-stage video {
  max-width: 100%;
  max-height: 82vh;
  width: auto;
  height: auto;
  display: block;
  background: var(--bg-primary);
}

.lightbox-caption {
  max-width: min(1000px, 90vw);
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.lightbox-caption a { text-decoration: underline; text-underline-offset: 3px; }

.lightbox-close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border-bright);
  background: rgba(7, 9, 26, 0.7);
  color: var(--text-primary);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.lightbox-close:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

body.lb-lock { overflow: hidden; }

/* ── Home Scene Showcase (video strip) ───────────────────────── */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.showcase-item {
  position: relative;
  aspect-ratio: 16 / 11;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-faint);
  background: #04060f;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.showcase-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
  transform: translateY(-2px);
}

.showcase-item video,
.showcase-item img.showcase-poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.showcase-item .showcase-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0.85rem 0.95rem;
  background: linear-gradient(180deg, transparent 45%, rgba(4, 6, 15, 0.82) 100%);
  pointer-events: none;
}

.showcase-name {
  font-weight: 600;
  font-size: 0.82rem;
  color: #fff;
  line-height: 1.25;
}

.showcase-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.66rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
  letter-spacing: 0.03em;
}

.showcase-split {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 3;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.showcase-split.train { background: rgba(74, 222, 128, 0.85); color: #052a10; }
.showcase-split.test  { background: rgba(248, 113, 113, 0.85); color: #2a0505; }

@media (max-width: 900px) {
  .showcase-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .showcase-grid { grid-template-columns: 1fr; }
}