:root {
  --bg: #f5f8f7;
  --card: #ffffff;
  --ink: #0b1414;
  --sub: #4a5a58;
  --line: #d8e2e0;
  --brand: #0f766e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1414;
    --card: #142120;
    --ink: #e6efed;
    --sub: #9fb3b0;
    --line: #22332f;
    --brand: #2dd4bf;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.logo { font-size: 24px; font-weight: 700; text-decoration: none; color: var(--ink); }
.logo span { color: var(--brand); }
nav a { color: var(--brand); text-decoration: none; margin-left: 16px; }
nav a:first-child { margin-left: 0; }
h1 { font-size: 28px; line-height: 1.25; margin: 32px 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
p, li { color: var(--ink); }
.meta { color: var(--sub); font-size: 14px; margin: 0 0 24px; }
.lang { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 8px; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px; border-bottom: 1px solid var(--line); }
th { color: var(--sub); font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin: 24px 0; }
a { color: var(--brand); }
footer { margin-top: 48px; color: var(--sub); font-size: 14px; }
@media (max-width: 520px) { table, thead, tbody, tr, th, td { display: block; } thead { display: none; } td { border: 0; padding: 2px 0; } tr { border-bottom: 1px solid var(--line); padding: 8px 0; } }