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

:root {
  --bg: #0f1117;
  --bg2: #161822;
  --bg3: #1e2030;
  --bg4: #262940;
  --text: #e2e4ed;
  --text2: #a0a4b8;
  --text3: #6b6f85;
  --border: #2a2d3e;
  --border2: #383b50;
  --radius: 6px;
  --radius-lg: 10px;
  --accent: #4d9fff;
  --teal: #4ecdc4;
  --amber: #f0a500;
  --red: #e74c3c;
  --green: #2ecc71;
  --purple: #9b59b6;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --max-w: 1000px;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg2: #f8f9fa;
  --bg3: #f0f1f4;
  --bg4: #e8e9ee;
  --text: #1a1c24;
  --text2: #555866;
  --text3: #888b99;
  --border: #e0e2e8;
  --border2: #d0d2d8;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Navigation ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  height: 52px;
  gap: 8px;
}
.nav-logo {
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.3px;
  margin-right: 1.5rem;
  white-space: nowrap;
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.nav-links a {
  font-size: 13px;
  color: var(--text2);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
  background: var(--bg3);
  color: var(--text);
}
.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.theme-toggle {
  background: none;
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  color: var(--text2);
  padding: 4px 8px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.15s;
}
.theme-toggle:hover { background: var(--bg3); }

/* ── Main content ── */
.page {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

/* ── Typography ── */
h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}
h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
h3 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}
p { margin-bottom: 1rem; color: var(--text2); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.subtitle {
  font-size: 16px;
  color: var(--text3);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* ── Metric tiles ── */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 2rem;
}
@media (max-width: 700px) { .metric-grid { grid-template-columns: repeat(2, 1fr); } }
.metric {
  background: var(--bg2);
  padding: 1.25rem;
}
.metric-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.metric-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 24px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.5px;
}
.metric-sub {
  font-size: 11px;
  color: var(--text3);
  margin-top: 4px;
}

/* ── Cards ── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.card-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

/* ── Tables ── */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-bottom: 1.5rem;
}
th {
  text-align: left;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text3);
  padding: 8px 12px;
  border-bottom: 2px solid var(--border);
}
td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text2);
}
tr:hover td { background: var(--bg3); }

/* ── Code blocks ── */
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: var(--bg3);
  padding: 2px 6px;
  border-radius: 4px;
}
pre {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  color: var(--text2);
}
pre code { background: none; padding: 0; }

/* ── Badges ── */
.badge {
  display: inline-block;
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 500;
  border: 1px solid currentColor;
}
.badge-blue { color: var(--accent); }
.badge-green { color: var(--green); }
.badge-amber { color: var(--amber); }
.badge-red { color: var(--red); }
.badge-purple { color: var(--purple); }
.badge-teal { color: var(--teal); }

/* ── Diagram / ASCII art box ── */
.diagram {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text2);
  margin-bottom: 1.5rem;
  white-space: pre;
}

/* ── Section label ── */
.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 1rem;
  margin-top: 2rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-label::before {
  content: '';
  display: block;
  width: 16px;
  height: 1px;
  background: var(--border2);
}

/* ── Footer ── */
footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem 2rem;
  font-size: 11px;
  color: var(--text3);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
footer a { color: var(--text3); }
footer a:hover { color: var(--text2); }

/* ── Changelog entries ── */
.changelog-entry {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.changelog-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text3);
  margin-bottom: 4px;
}
.changelog-title {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
}
.changelog-body {
  font-size: 13px;
  color: var(--text2);
}

/* ── Skill cards ── */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-bottom: 1.5rem;
}
.skill-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.skill-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 4px;
}
.skill-cat {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text3);
  margin-bottom: 6px;
}
.skill-desc {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.5;
}

/* ── Benchmark status ── */
.status-live { color: var(--green); }
.status-pending { color: var(--amber); }
.status-planned { color: var(--text3); }
.status-live { color: var(--green); font-weight: 600; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .page { padding: 1.5rem 1rem 3rem; }
  h1 { font-size: 22px; }
  .nav-inner { padding: 0 1rem; }
  .nav-links a { font-size: 12px; padding: 4px 6px; }
}