:root {
  --bg: #f7f2e8;
  --surface: #fffdf8;
  --text: #2b2a27;
  --muted: #6b665c;
  --accent: #c0563b;
  --line: #e4dccb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b19;
    --surface: #262522;
    --text: #ece7dd;
    --muted: #a8a196;
    --accent: #e98a6f;
    --line: #3a3833;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Helvetica Neue", sans-serif;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

header { margin-bottom: 24px; }
header p { margin: 0; color: var(--muted); }

h1 { font-size: 1.75rem; line-height: 1.3; margin: 0 0 4px; }
h2 { font-size: 1.3rem; margin: 40px 0 12px; padding-top: 24px; border-top: 1px solid var(--line); }
h3 { font-size: 1.05rem; margin: 24px 0 4px; }

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

.lang-switch { display: flex; gap: 12px; margin: 16px 0 0; }
.lang-switch a {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  background: var(--surface);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 16px 0;
}

.muted { color: var(--muted); font-size: 0.9rem; }

footer { margin-top: 48px; color: var(--muted); font-size: 0.9rem; }