:root {
  --bg: #fbfaf7;
  --text: #1d1d1f;
  --muted: #5f6368;
  --line: #e4e1da;
  --accent: #c0392b;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141517;
    --text: #ececea;
    --muted: #a3a6ab;
    --line: #2c2f33;
    --accent: #ff6b5b;
    --card: #1c1e21;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 48px 20px 80px; }
header.site { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
header.site a.brand { font-weight: 800; font-size: 18px; color: var(--text); text-decoration: none; letter-spacing: 0.02em; }
header.site nav { display: flex; gap: 18px; font-size: 14px; }
a { color: var(--accent); text-underline-offset: 3px; }
h1 { font-size: 32px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
h3 { font-size: 16px; margin: 24px 0 6px; }
p, li { margin: 0 0 12px; }
ul { padding-left: 22px; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 28px; }
.lang-switch { font-size: 14px; color: var(--muted); margin-bottom: 8px; }
section.lang { border-top: 1px solid var(--line); padding-top: 8px; margin-top: 40px; }
section.lang:first-of-type { border-top: 0; margin-top: 0; padding-top: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin: 20px 0; }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0 16px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
footer { margin-top: 56px; color: var(--muted); font-size: 13px; }
.hero { padding: 24px 0 8px; }
.hero p { font-size: 18px; color: var(--muted); }