:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5d6880;
  --blue: #297bff;
  --line: #e6eaf0;
  --surface: #ffffff;
  --background: #f6f8fc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

a { color: var(--blue); }

.site-header {
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid var(--line);
}

.nav, main, .site-footer {
  width: min(100% - 32px, 780px);
  margin: 0 auto;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  min-height: 64px;
}

.brand {
  margin-right: auto;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.nav a:not(.brand) { font-size: 14px; text-decoration: none; }

main {
  margin-top: 32px;
  margin-bottom: 40px;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 8px 28px rgba(31, 56, 88, .05);
}

h1, h2, h3 { line-height: 1.35; }
h1 { margin: 0 0 8px; font-size: clamp(28px, 5vw, 38px); }
h2 { margin-top: 36px; font-size: 21px; }
h3 { margin-top: 24px; font-size: 17px; }
p, li { color: #344057; }
.lede, .updated { color: var(--muted); }
.lede { font-size: 18px; }
.updated { margin-top: 0; font-size: 14px; }
.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--blue);
  border-radius: 8px;
  background: #f0f6ff;
}
.cards { display: grid; gap: 14px; margin-top: 24px; }
.card { display: block; padding: 20px; color: inherit; text-decoration: none; border: 1px solid var(--line); border-radius: 14px; }
.card:hover { border-color: var(--blue); }
.card h2 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; }
code { padding: 1px 5px; border-radius: 4px; background: #f0f2f5; }
.site-footer { padding-bottom: 36px; color: var(--muted); font-size: 13px; }

@media (max-width: 560px) {
  .nav { padding: 12px 0; }
  .brand { width: 100%; }
  main { margin-top: 16px; padding: 24px 20px; border-radius: 12px; }
}