/* ============ CSS Variables & Reset ============ */
:root {
  --bg: #f0f4f8;
  --bg-card: #ffffff;
  --bg-card-hover: #f5f8ff;
  --bg-surface: #e8eef6;
  --border: #d1dce8;
  --border-hover: #a8bdd4;
  --text-primary: #0f1f30;
  --text-secondary: #3d5a73;
  --text-muted: #8aa0b4;
  --accent-ar: #2d7dd2;
  --accent-ar-bg: rgba(45, 125, 210, 0.08);
  --accent-diff: #0fa874;
  --accent-diff-bg: rgba(15, 168, 116, 0.08);
  --accent-hybrid: #e07b2a;
  --accent-hybrid-bg: rgba(224, 123, 42, 0.08);
  --accent-green: #0fa874;
  --radius: 10px;
  --radius-sm: 7px;
  --radius-xs: 5px;
  --shadow: 0 2px 12px rgba(45, 100, 160, 0.10);
  --transition: 0.15s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============ Header ============ */
.header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 44px 24px 36px;
  text-align: center;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 10px;
}

.logo-icon { font-size: 30px; }

.logo h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.4px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  max-width: 560px;
  margin: 0 auto;
}

/* GitHub star banner */
.star-banner {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 8px 16px 8px 14px;
  background: rgba(15, 168, 116, 0.10);
  border: 1.5px solid rgba(15, 168, 116, 0.45);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: #0a8f62;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(15, 168, 116, 0.15);
}

.star-banner::after {
  content: '→';
  font-size: 13px;
  opacity: 0.5;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.star-banner:hover {
  background: rgba(15, 168, 116, 0.18);
  border-color: rgba(15, 168, 116, 0.65);
  color: #077a52;
  box-shadow: 0 4px 14px rgba(15, 168, 116, 0.25);
  transform: translateY(-1px);
}

.star-banner:hover::after {
  opacity: 1;
  transform: translateX(3px);
}

.star-banner:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(15, 168, 116, 0.15);
}

/* ============ Stats Bar ============ */
.stats-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
}

.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}

.stat-number {
  font-size: 20px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.stat-card[data-category="Auto-Regressive"] .stat-number { color: var(--accent-ar); }
.stat-card[data-category="Diffusion"] .stat-number { color: var(--accent-diff); }
.stat-card[data-category="AR & Diffusion"] .stat-number { color: var(--accent-hybrid); }

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ============ Controls ============ */
.controls {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(240, 244, 248, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
}

.controls-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 10px 38px 10px 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--accent-ar);
  box-shadow: 0 0 0 3px rgba(45, 125, 210, 0.10);
}

.search-box input::placeholder { color: var(--text-muted); }

.clear-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  display: none;
  padding: 4px 8px;
  border-radius: var(--radius-xs);
}

.clear-btn:hover { color: var(--text-secondary); }
.clear-btn.visible { display: block; }

.filter-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-tabs {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.tab {
  padding: 5px 13px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.tab:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.tab.active {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.tab.active[data-category="Auto-Regressive"] { border-color: rgba(45,125,210,0.5); color: var(--accent-ar); background: rgba(45,125,210,0.06); }
.tab.active[data-category="Diffusion"] { border-color: rgba(15,168,116,0.5); color: var(--accent-diff); background: rgba(15,168,116,0.06); }
.tab.active[data-category="AR & Diffusion"] { border-color: rgba(224,123,42,0.5); color: var(--accent-hybrid); background: rgba(224,123,42,0.06); }

.tab-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.tab-dot.ar { background: var(--accent-ar); }
.tab-dot.diff { background: var(--accent-diff); }
.tab-dot.hybrid { background: var(--accent-hybrid); }

.sort-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-group label { font-size: 13px; color: var(--text-secondary); }

.sort-group select {
  padding: 5px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font);
  cursor: pointer;
  outline: none;
}

.sort-group select:focus { border-color: var(--accent-ar); }

/* ============ Content ============ */
.content { padding: 24px; }

.content-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.results-info {
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--text-muted);
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 10px;
}

/* ============ Model Card ============ */
.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
  animation: fadeIn 0.25s ease both;
}

.model-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
  gap: 10px;
}

.card-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.card-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  white-space: nowrap;
  flex-shrink: 0;
}

.card-badge.ar {
  background: var(--accent-ar-bg);
  color: var(--accent-ar);
  border: 1px solid rgba(45,125,210,0.22);
}

.card-badge.diff {
  background: var(--accent-diff-bg);
  color: var(--accent-diff);
  border: 1px solid rgba(15,168,116,0.22);
}

.card-badge.hybrid {
  background: var(--accent-hybrid-bg);
  color: var(--accent-hybrid);
  border: 1px solid rgba(224,123,42,0.22);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.meta-tag {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.meta-tag svg {
  width: 11px;
  height: 11px;
}

.card-highlight {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 14px;
}

.card-footer {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.card-link {
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-surface);
}

.card-link:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.card-link svg { width: 11px; height: 11px; }

.card-conference {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: var(--bg-surface);
}

.card-area {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: var(--bg-surface);
}

/* ============ Modal ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 31, 48, 0.45);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-overlay.active { display: flex; }

.modal {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 800px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(45, 100, 160, 0.18);
}

.modal-close {
  position: sticky;
  top: 12px;
  float: right;
  margin: 12px 12px 0 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 18px;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.modal-body { padding: 28px 32px 32px; }

.modal-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.modal-badges {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.modal-section { margin-bottom: 18px; }

.modal-section-title {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

.modal-section-content {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.modal-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.modal-info-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

.modal-info-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 3px;
}

.modal-info-value {
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
}

.modal-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.modal-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-surface);
}

.modal-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.modal-link.paper-link { border-color: rgba(45,125,210,0.35); color: var(--accent-ar); background: rgba(45,125,210,0.05); }
.modal-link.paper-link:hover { background: rgba(45,125,210,0.10); border-color: rgba(45,125,210,0.55); }
.modal-link.code-link { border-color: rgba(15,168,116,0.35); color: var(--accent-diff); background: rgba(15,168,116,0.05); }
.modal-link.code-link:hover { background: rgba(15,168,116,0.10); border-color: rgba(15,168,116,0.55); }
.modal-link svg { width: 14px; height: 14px; }

/* ============ Footer ============ */
.footer {
  text-align: center;
  padding: 28px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
  background: var(--bg-card);
}

/* ============ No results ============ */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

.no-results-icon { font-size: 36px; margin-bottom: 12px; }
.no-results-text { font-size: 15px; margin-bottom: 4px; color: var(--text-secondary); }
.no-results-hint { font-size: 13px; }

/* ============ Scrollbar ============ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .logo h1 { font-size: 22px; }
  .header { padding: 28px 16px 24px; }
  .subtitle { font-size: 13px; }
  .stats-inner { gap: 8px; }
  .stat-card { padding: 6px 14px; }
  .stat-number { font-size: 17px; }
  .model-grid { grid-template-columns: 1fr; }
  .filter-group { flex-direction: column; align-items: flex-start; }
  .modal-body { padding: 20px; }
  .modal-title { font-size: 19px; }
  .modal-info-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .filter-tabs { gap: 4px; }
  .tab { padding: 5px 10px; font-size: 12px; }
}

/* ============ Animations ============ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.model-card:nth-child(2) { animation-delay: 0.02s; }
.model-card:nth-child(3) { animation-delay: 0.04s; }
.model-card:nth-child(4) { animation-delay: 0.06s; }
.model-card:nth-child(5) { animation-delay: 0.08s; }
.model-card:nth-child(6) { animation-delay: 0.10s; }
.model-card:nth-child(7) { animation-delay: 0.12s; }
.model-card:nth-child(8) { animation-delay: 0.14s; }
.model-card:nth-child(9) { animation-delay: 0.16s; }
.model-card:nth-child(10) { animation-delay: 0.18s; }