:root {
  --bg: #fbfbf9;
  --fg: #1d1d1b;
  --muted: #5c5c57;
  --rule: #e3e2dc;
  --accent: #2f5d8a;
  --accent-soft: #e8eef5;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141413;
    --fg: #ecebe6;
    --muted: #a3a29b;
    --rule: #2e2d2a;
    --accent: #8db4dc;
    --accent-soft: #1d2834;
    --card: #1c1c1a;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }

.site-nav {
  border-bottom: 1px solid var(--rule);
}
.site-nav .inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; }
.links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.links a { text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.links a:hover, .links a:focus { text-decoration: underline; }
.links a[aria-current="page"] { color: var(--fg); }

.wrap { max-width: 820px; margin: 0 auto; padding: 40px 20px 72px; }

.hero { padding: 24px 0 8px; }
.hero h1 { font-size: 2.6rem; line-height: 1.1; margin: 0 0 12px; letter-spacing: -0.02em; }
.hero .tagline { font-size: 1.2rem; color: var(--muted); margin: 0 0 20px; max-width: 640px; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 8px; padding: 0; list-style: none; }
.badges li { background: var(--accent-soft); color: var(--fg); border-radius: 999px; padding: 4px 12px; font-size: 0.85rem; margin: 0; }

h1.page-title { font-size: 2rem; line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.01em; }
section { margin: 0 0 48px; scroll-margin-top: 16px; }
h2 { font-size: 1.4rem; margin: 0 0 10px; }
h3 { font-size: 1.05rem; margin: 26px 0 6px; }
p, li { margin: 0 0 12px; }
ul, ol { padding-left: 1.25rem; margin: 0 0 12px; }
.meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 28px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.85em; word-break: break-all; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 16px 18px; }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.callout { background: var(--accent-soft); border-radius: 10px; padding: 16px 18px; margin: 16px 0; }

table { width: 100%; border-collapse: collapse; margin: 8px 0 16px; font-size: 0.95rem; }
th, td { text-align: left; vertical-align: top; padding: 9px 10px; border-bottom: 1px solid var(--rule); }
th { font-weight: 600; }

.toc { border: 1px solid var(--rule); border-radius: 10px; padding: 14px 18px; margin: 0 0 36px; background: var(--card); }
.toc ol { margin: 0; columns: 2; column-gap: 28px; }
.toc li { margin: 0 0 4px; break-inside: avoid; }

footer { border-top: 1px solid var(--rule); }
footer .inner { max-width: 820px; margin: 0 auto; padding: 20px; color: var(--muted); font-size: 0.85rem; display: flex; flex-wrap: wrap; gap: 6px 18px; justify-content: space-between; }
footer a { color: var(--muted); }

@media (max-width: 560px) {
  .wrap { padding: 28px 16px 56px; }
  .hero h1 { font-size: 2.1rem; }
  .toc ol { columns: 1; }
  table, thead, tbody, tr, th, td { display: block; }
  thead { display: none; }
  td { border-bottom: none; padding: 2px 0; }
  tr { border-bottom: 1px solid var(--rule); padding: 10px 0; }
  td:first-child { font-weight: 600; }
}