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

:root {
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Dark mode (default) */
  --bg:        #0D1117;
  --bg2:       #161B22;
  --bg3:       #1C2128;
  --border:    rgba(255,255,255,0.08);
  --border2:   rgba(255,255,255,0.14);
  --text:      #E6EDF3;
  --text2:     #8B949E;
  --text3:     #484F58;
  --green:     #1A9E5C;
  --green2:    #1AB568;
  --green-dim: rgba(26,158,92,0.15);
  --green-bg:  rgba(26,158,92,0.08);
  --purple:    #8B5CF6;
  --purple-dim:rgba(139,92,246,0.15);
  --blue:      #378ADD;
  --blue-dim:  rgba(55,138,221,0.12);
  --amber:     #EF9F27;
  --amber-dim: rgba(239,159,39,0.12);
  --coral:     #D85A30;
  --coral-dim: rgba(216,90,48,0.12);
  --teal:      #1D9E75;
  --teal-dim:  rgba(29,158,117,0.12);
  --card-shadow: 0 1px 3px rgba(0,0,0,0.4);
  --toggle-bg: #1C2128;
}

body.light {
  --bg:        #F7F9F7;
  --bg2:       #FFFFFF;
  --bg3:       #F1EFE8;
  --border:    rgba(0,0,0,0.08);
  --border2:   rgba(0,0,0,0.14);
  --text:      #0F2E1A;
  --text2:     #444441;
  --text3:     #888780;
  --green:     #1A9E5C;
  --green2:    #157A47;
  --green-dim: rgba(26,158,92,0.1);
  --green-bg:  rgba(26,158,92,0.06);
  --purple:    #534AB7;
  --purple-dim:rgba(83,74,183,0.1);
  --blue:      #185FA5;
  --blue-dim:  rgba(24,95,165,0.08);
  --amber:     #854F0B;
  --amber-dim: rgba(133,79,11,0.08);
  --coral:     #993C1D;
  --coral-dim: rgba(153,60,29,0.08);
  --teal:      #0F6E56;
  --teal-dim:  rgba(15,110,86,0.08);
  --card-shadow: 0 1px 3px rgba(0,0,0,0.08);
  --toggle-bg: #E6F7EE;
}

html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.2s, color 0.2s;
}
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green2); text-decoration: underline; }
code, .mono { font-family: var(--mono); font-size: 0.85em; }

/* ── Layout ───────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  backdrop-filter: blur(8px);
}
.header-left  { display: flex; align-items: center; gap: 16px; }
.header-right { display: flex; align-items: center; gap: 16px; }

.logo-mark {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
}
.logo-text { font-size: 14px; font-weight: 600; color: var(--text); }
.logo-sub  { font-size: 12px; color: var(--text2); }

.nav-links { display: flex; gap: 4px; }
.nav-links a {
  font-size: 13px; color: var(--text2); padding: 6px 10px;
  border-radius: 6px; transition: color 0.15s, background 0.15s;
  text-decoration: none;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text); background: var(--bg3);
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 32px; }
.page-body  { padding: 48px 32px; max-width: 1100px; margin: 0 auto; }

/* ── Theme toggle ─────────────────────────────────────────────── */
.theme-toggle {
  width: 40px; height: 22px;
  background: var(--toggle-bg);
  border: 1px solid var(--border2);
  border-radius: 11px;
  cursor: pointer;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.theme-toggle::after {
  content: '';
  position: absolute; top: 2px; left: 2px;
  width: 16px; height: 16px;
  background: var(--green);
  border-radius: 50%;
  transition: transform 0.2s;
}
body.light .theme-toggle::after { transform: translateX(18px); }

.toggle-label { font-size: 12px; color: var(--text2); user-select: none; }

/* ── Cards ────────────────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--card-shadow);
  transition: background 0.2s, border-color 0.2s;
}
.card-hover {
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.card-hover:hover {
  border-color: var(--green);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3), 0 0 0 1px var(--green-dim);
}

/* ── Badges ───────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  font-size: 11px; font-weight: 500;
  padding: 2px 8px; border-radius: 99px;
  white-space: nowrap;
}
.badge-green  { background: var(--green-dim);  color: var(--green); }
.badge-purple { background: var(--purple-dim); color: var(--purple); }
.badge-blue   { background: var(--blue-dim);   color: var(--blue); }
.badge-amber  { background: var(--amber-dim);  color: var(--amber); }
.badge-coral  { background: var(--coral-dim);  color: var(--coral); }
.badge-teal   { background: var(--teal-dim);   color: var(--teal); }
.badge-gray   { background: var(--bg3);        color: var(--text2); }

/* ── Tables ───────────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
  text-align: left; padding: 10px 14px;
  background: var(--bg3); color: var(--text2);
  font-size: 11px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--green-bg); }
.data-table .dim { color: var(--text2); font-size: 13px; }

/* ── Divider ──────────────────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--border); margin: 32px 0; }

/* ── Typography helpers ───────────────────────────────────────── */
.section-label {
  font-size: 11px; font-weight: 500; letter-spacing: 1px;
  text-transform: uppercase; color: var(--text3); margin-bottom: 12px;
}
.page-title   { font-size: 28px; font-weight: 700; color: var(--text); }
.page-subtitle{ font-size: 15px; color: var(--text2); margin-top: 6px; }
h2.section-h  { font-size: 18px; font-weight: 600; color: var(--text); margin-bottom: 16px; }
h3.sub-h      { font-size: 15px; font-weight: 600; color: var(--text); margin-bottom: 10px; }

/* ── Arch diagram nodes ───────────────────────────────────────── */
.arch-node {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  text-decoration: none;
  display: block;
}
.arch-node:hover { border-color: var(--green); background: var(--bg3); text-decoration: none; }
.arch-node-title { font-size: 13px; font-weight: 600; color: var(--text); }
.arch-node-sub   { font-size: 11px; color: var(--text2); margin-top: 2px; }

.arch-row { display: flex; gap: 12px; margin-bottom: 12px; align-items: stretch; }
.arch-row.center { justify-content: center; }
.arch-row.spread { justify-content: space-between; }

.arch-connector {
  display: flex; justify-content: center; align-items: center;
  height: 28px; gap: 4px; margin: -4px 0;
}
.arch-connector svg { opacity: 0.4; }

/* ── Breadcrumb ───────────────────────────────────────────────── */
.breadcrumb { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text2); margin-bottom: 24px; }
.breadcrumb a { color: var(--text2); text-decoration: none; }
.breadcrumb a:hover { color: var(--green); }
.breadcrumb .sep { color: var(--text3); }

/* ── Pill grid ────────────────────────────────────────────────── */
.pill-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  font-size: 12px; font-weight: 500; font-family: var(--mono);
  padding: 4px 12px; border-radius: 6px;
  background: var(--bg3); border: 1px solid var(--border2);
  color: var(--text); white-space: nowrap;
}

/* ── Flow arrows ─────────────────────────────────────────────── */
.flow-arrow { color: var(--text3); font-size: 18px; line-height: 1; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 700px) {
  .page-body { padding: 24px 16px; }
  .site-header { padding: 0 16px; }
  .arch-row { flex-wrap: wrap; }
}