:root {
  --bg: #ffffff;
  --fg: #1d2330;
  --muted: #5b6475;
  --line: #e4e7ec;
  --accent: #f08a1c;
  --card: #f7f8fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --fg: #e8eaee;
    --muted: #a0a7b4;
    --line: #2a2f3a;
    --card: #1a1e26;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 18px; padding-bottom: 18px; }
.brand { font-weight: 700; font-size: 20px; color: var(--fg); letter-spacing: .2px; }
.brand span { color: var(--accent); }
nav a { margin-left: 18px; color: var(--muted); font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a.active { color: var(--fg); font-weight: 600; }
main { padding: 48px 0 64px; }
h1 { font-size: 34px; line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 22px; margin: 36px 0 12px; }
h3 { font-size: 17px; margin: 24px 0 8px; }
p, li { color: var(--fg); }
.lead { font-size: 18px; color: var(--muted); max-width: 680px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin-top: 32px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.card h3 { margin-top: 0; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
dl.info { display: grid; grid-template-columns: max-content 1fr; gap: 10px 24px; margin: 0; }
dl.info dt { color: var(--muted); }
dl.info dd { margin: 0; }
.meta { color: var(--muted); font-size: 14px; }
footer { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 14px; }
footer p { margin: 4px 0; color: var(--muted); }
@media (max-width: 560px) {
  h1 { font-size: 28px; }
  nav a { margin-left: 12px; }
  dl.info { grid-template-columns: 1fr; gap: 2px 0; }
  dl.info dd { margin-bottom: 10px; }
}