:root {
  color-scheme: light;
  --ink: #13243a;
  --muted: #5d6b7c;
  --blue: #0f4d92;
  --line: #dce5ef;
  --soft: #f4f8fc;
  --white: #ffffff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--blue); }
.wrap { width: min(920px, calc(100% - 36px)); margin: 0 auto; }
header { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); }
nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-weight: 700; }
.brand img { width: 38px; height: 38px; border-radius: 9px; }
.links { display: flex; flex-wrap: wrap; gap: 16px; font-size: 14px; }
.links a { color: var(--muted); text-decoration: none; }
main { padding: 64px 0 76px; }
.hero { padding: 34px; background: var(--soft); border: 1px solid var(--line); border-radius: 22px; }
h1 { margin: 0 0 14px; font-size: clamp(32px, 6vw, 52px); line-height: 1.15; letter-spacing: -.03em; }
h2 { margin: 42px 0 12px; font-size: 24px; line-height: 1.3; }
h3 { margin: 28px 0 8px; font-size: 18px; }
p, li { max-width: 78ch; }
.lead { color: var(--muted); font-size: 19px; }
.notice { margin: 24px 0; padding: 18px 20px; border-left: 4px solid var(--blue); background: var(--soft); }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; margin-top: 28px; }
.card { padding: 22px; border: 1px solid var(--line); border-radius: 16px; }
.card h2 { margin-top: 0; }
.meta { color: var(--muted); font-size: 14px; }
footer { padding: 24px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
code { padding: 2px 6px; border-radius: 6px; background: var(--soft); }
@media (max-width: 680px) {
  nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  main { padding-top: 34px; }
  .hero { padding: 24px; }
  .cards { grid-template-columns: 1fr; }
}