:root {
  --bg: #faf7f2;
  --fg: #1f1d1a;
  --muted: #6b665e;
  --accent: #c8553d;
  --card: #ffffff;
  --line: #e7e1d8;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1917;
    --fg: #f1ece4;
    --muted: #a9a297;
    --accent: #e07a5f;
    --card: #24221f;
    --line: #3a3732;
  }
}
:root[data-theme="dark"] {
  --bg: #1a1917;
  --fg: #f1ece4;
  --muted: #a9a297;
  --accent: #e07a5f;
  --card: #24221f;
  --line: #3a3732;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Segoe UI", sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; }
nav a { color: var(--muted); margin-left: 16px; text-decoration: none; }
nav a:hover, a { color: var(--accent); }
h1 { font-size: 34px; line-height: 1.2; margin: 40px 0 12px; }
h2 { font-size: 22px; margin: 36px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
.lead { font-size: 19px; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; margin: 24px 0; }
.visual { width: 100%; height: auto; display: block; }
.lang { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 8px; }
ul { padding-left: 22px; }
footer { color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); margin-top: 48px; padding-top: 16px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
td, th { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }