@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #F6F7FB;
  --surface: #FFFFFF;
  --surface-2: #F0F2F8;
  --surface-3: #E7EAF3;
  --border: #DEE2ED;
  --border-soft: #E9ECF4;
  --text-primary: #182034;
  --text-secondary: #566079;
  --text-muted: #8791A81f;
  --text-muted-solid: #7B8499;
  --accent: #3A63D8;
  --accent-dim: #3A63D814;
  --key: #9A6B08;
  --key-dim: #F2C94C22;
  --rel: #0E8F72;
  --rel-dim: #0E8F7220;
  --danger: #C13F3F;
  --danger-dim: #C13F3F16;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --sidebar-w: 248px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

a { color: inherit; text-decoration: none; }

/* ---------- Layout shell ---------- */

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--border-soft);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  background: var(--surface);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand .mark {
  width: 34px; height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--rel));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  color: #061019;
  margin-bottom: 6px;
}

.brand h1 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}

.brand p {
  font-size: 12px;
  color: var(--text-muted-solid);
  margin: 0;
  font-family: var(--font-mono);
}

nav.primary-nav { display: flex; flex-direction: column; gap: 2px; }

nav.primary-nav a {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 9px 12px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  border: 1px solid transparent;
}

nav.primary-nav a .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted-solid);
}

nav.primary-nav a:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

nav.primary-nav a.active {
  background: var(--accent-dim);
  color: var(--text-primary);
  border-color: #5B8DFF3d;
}

nav.primary-nav a.active .num { color: var(--accent); }

.sidebar-foot {
  margin-top: auto;
  font-size: 11.5px;
  color: var(--text-muted-solid);
  font-family: var(--font-mono);
  line-height: 1.6;
  border-top: 1px solid var(--border-soft);
  padding-top: 16px;
}

.menu-toggle {
  display: none;
  position: fixed;
  top: 16px; left: 16px;
  z-index: 40;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 40px; height: 40px;
  color: var(--text-primary);
  font-size: 16px;
  align-items: center; justify-content: center;
}

main.content {
  padding: 56px 64px 90px;
  max-width: 980px;
}

@media (max-width: 880px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    width: 240px;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 30;
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: flex; }
  main.content { padding: 90px 24px 60px; }
}

/* ---------- Typography ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 2px;
  background: var(--accent);
  display: inline-block;
}

h1.page-title {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1.15;
}

.lede {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 0 40px;
}

h2.section-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin: 56px 0 8px;
  letter-spacing: -0.01em;
}

h3.sub-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 10px;
}

p.section-desc {
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 640px;
  margin: 0 0 24px;
}

code, .mono { font-family: var(--font-mono); }

/* ---------- Schema table card (signature component) ---------- */

.schema-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
  margin: 20px 0 12px;
}

.schema-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.schema-card:hover {
  border-color: #B7C2DE;
  transform: translateY(-2px);
}

.schema-card .card-head {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.schema-card .card-head .table-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.badge {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 5px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
}

.badge.native { background: var(--rel-dim); color: var(--rel); }
.badge.custom { background: var(--accent-dim); color: var(--accent); }

.field-row {
  display: grid;
  grid-template-columns: 20px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 8px 16px;
  font-size: 12.5px;
  border-bottom: 1px solid var(--border-soft);
}

.field-row:last-child { border-bottom: none; }

.field-row .key-icon {
  width: 16px; height: 16px;
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
}

.key-icon.pk { background: var(--key-dim); color: var(--key); }
.key-icon.fk { background: var(--rel-dim); color: var(--rel); }
.key-icon.none { background: transparent; }

.field-row .field-name { font-family: var(--font-mono); color: var(--text-primary); }
.field-row .field-type { color: var(--text-muted-solid); font-family: var(--font-mono); font-size: 11px; text-align: right; }

/* ---------- Callouts ---------- */

.callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 10px 10px 0;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 14.5px;
  color: var(--text-secondary);
}

.callout.warn { border-left-color: var(--danger); }
.callout strong { color: var(--text-primary); }

/* ---------- Rule list ---------- */

.rule-list { list-style: none; margin: 0 0 32px; padding: 0; display: flex; flex-direction: column; gap: 10px; }

.rule-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 14.5px;
  color: var(--text-secondary);
}

.rule-list .rule-idx {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

.rule-list strong { color: var(--text-primary); font-weight: 600; }

/* ---------- Table (relation matrix) ---------- */

table.rel-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 20px 0 40px;
}

table.rel-table th, table.rel-table td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--border-soft);
}

table.rel-table th {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted-solid);
  font-weight: 500;
}

table.rel-table td.mono-cell { font-family: var(--font-mono); color: var(--text-primary); font-size: 12.5px; }
table.rel-table td { color: var(--text-secondary); }

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 3px 8px;
  border-radius: 5px;
  background: var(--rel-dim);
  color: var(--rel);
}

/* ---------- Hero (index page) ---------- */

.hero-diagram {
  margin: 32px 0 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  padding: 28px;
}

.pill-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 24px 0 8px; }

.pill {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.page-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin: 40px 0;
}

.page-link-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  background: var(--surface);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.page-link-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.page-link-card .num { font-family: var(--font-mono); font-size: 11px; color: var(--accent); }
.page-link-card h4 { font-family: var(--font-display); font-size: 15px; margin: 8px 0 6px; font-weight: 600; }
.page-link-card p { font-size: 12.5px; color: var(--text-muted-solid); margin: 0; line-height: 1.5; }

.author-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin: 56px 0 20px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.author-avatar {
  flex: none;
  width: 48px; height: 48px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--rel));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  color: #FFFFFF;
}

.author-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15.5px;
  margin: 2px 0 2px;
  color: var(--text-primary);
}

.author-title {
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--text-muted-solid);
  margin: 0 0 12px;
}

.author-bio {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0 0 14px;
  max-width: 560px;
}

.author-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 7px 12px;
  border-radius: 7px;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.author-link:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

@media (max-width: 560px) {
  .author-card { flex-direction: column; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeUp 0.5s ease both; }