:root {
  --bg: #0b0d12;
  --panel: #121624;
  --panel2: #0f1320;
  --text: #e9ecf5;
  --muted: #a9b2c8;
  --faint: rgba(233, 236, 245, 0.06);
  --border: rgba(233, 236, 245, 0.12);
  --accent: #78dce8;
  --accent2: #a78bfa;
  --warn: #ffd166;
  --danger: #ff5c7a;
  --ok: #7ee787;
  --mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
  --serif: "Source Serif 4", ui-serif, Georgia, Cambria, "Times New Roman", serif;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(1200px 800px at 20% 10%, rgba(167, 139, 250, 0.18), transparent 60%),
    radial-gradient(1000px 700px at 85% 15%, rgba(120, 220, 232, 0.16), transparent 55%),
    radial-gradient(900px 700px at 70% 90%, rgba(255, 209, 102, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 18px 48px;
}

.sidebar {
  position: sticky;
  top: 18px;
  align-self: start;
  background: linear-gradient(180deg, rgba(18, 22, 36, 0.95), rgba(15, 19, 32, 0.92));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 14px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
}

.brand {
  display: grid;
  gap: 10px;
  padding: 6px 8px 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.brand .title {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 0.2px;
}

.brand .subtitle {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.nav {
  display: grid;
  gap: 6px;
  padding: 6px 8px;
}

.nav a {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px 10px;
  border-radius: 12px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
}

.nav a:hover {
  background: rgba(233, 236, 245, 0.04);
  border-color: rgba(233, 236, 245, 0.10);
  text-decoration: none;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(233, 236, 245, 0.05);
  border: 1px solid rgba(233, 236, 245, 0.10);
  color: var(--muted);
}

.main {
  min-width: 0;
  display: grid;
  gap: 18px;
}

.hero {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px 20px;
  background:
    linear-gradient(180deg, rgba(18, 22, 36, 0.88), rgba(15, 19, 32, 0.80)),
    radial-gradient(900px 250px at 15% 10%, rgba(120, 220, 232, 0.16), transparent 70%),
    radial-gradient(900px 250px at 85% 20%, rgba(167, 139, 250, 0.14), transparent 70%);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(10px);
}

.hero h1 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 650;
  letter-spacing: 0.2px;
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
  max-width: 78ch;
  line-height: 1.55;
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 16px;
  background: linear-gradient(180deg, rgba(18, 22, 36, 0.80), rgba(15, 19, 32, 0.76));
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.28);
}

.card h2, .card h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  letter-spacing: 0.2px;
}

.card h2 { font-size: 22px; }
.card h3 { font-size: 18px; }

.card p, .card li {
  color: var(--muted);
  line-height: 1.55;
}

.card ul { padding-left: 18px; margin: 10px 0 0; }

.k {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 2px 7px;
  border-radius: 8px;
  border: 1px solid rgba(233, 236, 245, 0.16);
  background: rgba(233, 236, 245, 0.06);
  color: var(--text);
}

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

pre {
  margin: 0;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(233, 236, 245, 0.12);
  background: rgba(3, 5, 10, 0.55);
  overflow: auto;
  color: var(--text);
}

.diagram {
  margin-top: 10px;
}

.diagram .mermaid {
  border-radius: 14px;
  border: 1px solid rgba(233, 236, 245, 0.10);
  background: rgba(3, 5, 10, 0.45);
  padding: 10px;
  overflow: auto;
}

.callout {
  border-left: 3px solid var(--accent);
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(120, 220, 232, 0.08);
  border: 1px solid rgba(120, 220, 232, 0.18);
  color: var(--muted);
}

.callout.warn {
  border-left-color: var(--warn);
  background: rgba(255, 209, 102, 0.08);
  border-color: rgba(255, 209, 102, 0.18);
}

.callout.danger {
  border-left-color: var(--danger);
  background: rgba(255, 92, 122, 0.08);
  border-color: rgba(255, 92, 122, 0.18);
}

.footer {
  color: rgba(233, 236, 245, 0.60);
  font-size: 12.5px;
  padding: 4px 2px 0;
}

@media (max-width: 980px) {
  .wrap { grid-template-columns: 1fr; }
  .sidebar { position: relative; top: auto; }
  .grid2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
}