:root {
  --ink: #0f172a;
  --muted: #475569;
  --brand: #1d4ed8;
  --brand-dark: #1e3a8a;
  --bg: #f8fafc;
  --card: #ffffff;
  --line: #e2e8f0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
.wrap { max-width: 900px; margin: 0 auto; padding: 0 20px; }
.topbar { background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--ink); text-decoration: none; }
.brand span { color: var(--brand); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: .92rem; }
nav a:hover { color: var(--ink); }
nav .cta { color: var(--brand); font-weight: 600; }
.hero { padding: 48px 0 16px; }
.hero h1 { font-size: 2.2rem; margin: 0 0 8px; }
.lede { color: var(--muted); font-size: 1.05rem; max-width: 640px; }
.hero-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 600;
  background: var(--brand); color: #fff; text-decoration: none; font-size: .92rem;
}
.btn:hover { background: var(--brand-dark); }
.btn.ghost { background: transparent; color: var(--brand); border: 1px solid var(--brand); }
.btn.ghost:hover { background: #eff6ff; }
section { padding: 24px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 1.4rem; margin: 0 0 12px; }
section h3 { font-size: 1.05rem; margin: 20px 0 8px; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .86em; background: #eef2f7; padding: 2px 5px; border-radius: 4px;
}
pre {
  background: #0f172a; color: #e2e8f0; padding: 14px 16px; border-radius: 8px;
  overflow-x: auto; font-size: .84rem; line-height: 1.55;
}
pre code { background: transparent; color: inherit; padding: 0; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: .92rem; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .03em; }
a { color: var(--brand); }
ul { padding-left: 20px; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: .85rem; }
@media (max-width: 640px) {
  nav a { margin-left: 10px; font-size: .85rem; }
  .hero h1 { font-size: 1.6rem; }
}