:root {
  --bg: #0a0e1a;
  --bg-card: #111827;
  --bg-card-hover: #1a2235;
  --border: #1e293b;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #eab308;
  --orange: #f97316;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  padding: 48px 0 32px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.site-header img {
  max-width: 360px;
  margin-bottom: 16px;
}

.site-header p {
  color: var(--text-muted);
  font-size: 15px;
  max-width: 640px;
  margin: 0 auto;
}

.badge-row {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.badge-blue { background: rgba(59,130,246,0.15); color: var(--accent-light); border: 1px solid rgba(59,130,246,0.3); }
.badge-green { background: rgba(34,197,94,0.15); color: var(--green); border: 1px solid rgba(34,197,94,0.3); }
.badge-yellow { background: rgba(234,179,8,0.15); color: var(--yellow); border: 1px solid rgba(234,179,8,0.3); }

/* Navigation */
nav {
  display: flex;
  gap: 32px;
  justify-content: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover, nav a.active { color: var(--accent-light); }

/* Sections */
section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

section:last-child { border-bottom: none; }

h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
}

/* Leaderboard Table */
.leaderboard {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

.leaderboard th {
  text-align: left;
  padding: 12px 16px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.leaderboard td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.leaderboard tr:hover td {
  background: var(--bg-card-hover);
}

.leaderboard .rank { font-weight: 700; color: var(--text-dim); width: 40px; }
.leaderboard .model { font-weight: 600; }
.leaderboard .provider { color: var(--text-muted); font-size: 13px; }

.score-cell {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.score-high { color: var(--green); }
.score-mid { color: var(--yellow); }
.score-low { color: var(--orange); }
.score-bad { color: var(--red); }

/* Task Cards */
.task-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}

.task-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  transition: border-color 0.2s;
}

.task-card:hover {
  border-color: rgba(59,130,246,0.4);
}

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}

.task-card h3 { margin: 0; font-size: 16px; }

.task-card .difficulty {
  font-size: 12px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.d4 { background: rgba(249,115,22,0.15); color: var(--orange); border: 1px solid rgba(249,115,22,0.3); }
.d5 { background: rgba(239,68,68,0.15); color: var(--red); border: 1px solid rgba(239,68,68,0.3); }
.d3 { background: rgba(234,179,8,0.15); color: var(--yellow); border: 1px solid rgba(234,179,8,0.3); }
.d1, .d2 { background: rgba(34,197,94,0.15); color: var(--green); border: 1px solid rgba(34,197,94,0.3); }

.task-card .meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.task-card .description {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.task-scores {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.task-score-item {
  font-size: 13px;
}

.task-score-item .model-name {
  color: var(--text-muted);
}

.task-score-item .score-value {
  font-weight: 700;
  margin-left: 4px;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
}

.stat-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Footer */
.site-footer {
  padding: 32px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}

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

/* Code */
code {
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 13px;
  margin: 16px 0;
}

pre code {
  background: none;
  padding: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  nav { gap: 16px; flex-wrap: wrap; }
  .task-scores { flex-direction: column; gap: 4px; }
}