:root {
  --ink: #1f1a24;
  --muted: #6b6474;
  --bg: #fbf8fb;
  --card: #ffffff;
  --line: #ece5ee;
  --brand: #e2557b;
  --brand-ink: #ffffff;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #f4eff6; --muted: #b3aab9; --bg: #151218; --card: #1f1a24; --line: #2e2734; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif; }
a { color: var(--brand); }
.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }
header.site { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
header.site .logo { font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; letter-spacing: .02em; }
header.site nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
.hero { padding: 56px 0 40px; }
.hero h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.12; margin: 0 0 16px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 640px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 32px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 18px; border-radius: 12px; border: 0; background: var(--brand); color: var(--brand-ink); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn.secondary { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn:disabled { opacity: .5; cursor: default; }
.doc { padding: 24px 0 64px; }
.doc h1 { font-size: 34px; margin-bottom: 4px; }
.doc h2 { font-size: 20px; margin-top: 32px; }
.doc .meta { color: var(--muted); font-size: 14px; }
footer.site { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer.site a { color: var(--muted); margin-right: 16px; }
input { width: 100%; min-height: 46px; padding: 0 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font: inherit; }
label { display: block; margin: 14px 0 6px; font-size: 14px; color: var(--muted); }
.error { color: #d8374f; min-height: 1.4em; font-size: 14px; }