:root {
  color-scheme: light dark;
  --bg: #f4f6fa;
  --surface: rgba(255, 255, 255, 0.86);
  --text: #101522;
  --muted: #667085;
  --line: rgba(16, 21, 34, 0.1);
  --brand: #1769ff;
  --brand-2: #6d5dfc;
  --shadow: 0 24px 70px rgba(24, 39, 75, 0.1);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080d18;
    --surface: rgba(18, 26, 43, 0.82);
    --text: #f6f8fc;
    --muted: #a6afc2;
    --line: rgba(255, 255, 255, 0.1);
    --brand: #5b8cff;
    --brand-2: #8c7cff;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: radial-gradient(circle at 10% -10%, rgba(23,105,255,.16), transparent 32rem), radial-gradient(circle at 100% 10%, rgba(109,93,252,.12), transparent 30rem), var(--bg);
  font: 16px/1.72 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
.shell { width: min(100% - 36px, 920px); margin: 0 auto; }
header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-weight: 800; }
.mark { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 13px; color: white; background: linear-gradient(145deg, var(--brand), var(--brand-2)); box-shadow: 0 10px 24px rgba(23,105,255,.25); }
nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 18px; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 650; }
nav a[aria-current="page"] { color: var(--brand); }
.hero { padding: 74px 0 44px; }
.eyebrow { margin: 0 0 12px; color: var(--brand); font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 760px; margin: 0; font-size: clamp(40px, 8vw, 72px); line-height: 1.02; letter-spacing: -.05em; }
.lede { max-width: 660px; margin: 24px 0 0; color: var(--muted); font-size: clamp(18px, 3vw, 22px); }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding: 28px 0 84px; }
.card { padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.card h2 { margin: 0 0 10px; font-size: 20px; letter-spacing: -.02em; }
.card p { margin: 0 0 20px; color: var(--muted); }
.card a { font-weight: 750; }
.document { margin: 34px auto 80px; padding: clamp(28px, 6vw, 64px); border: 1px solid var(--line); border-radius: 30px; background: var(--surface); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.document h1 { font-size: clamp(36px, 7vw, 58px); }
.document h2 { margin: 42px 0 10px; font-size: 23px; letter-spacing: -.025em; }
.document p, .document li { color: var(--muted); }
.document strong { color: var(--text); }
.meta { margin: 14px 0 36px; color: var(--muted); font-size: 14px; }
.notice { margin: 28px 0; padding: 18px 20px; border: 1px solid rgba(23,105,255,.2); border-radius: 16px; background: rgba(23,105,255,.07); }
.notice p { margin: 0; color: var(--text); }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 0 0 36px; color: var(--muted); font-size: 13px; }
@media (max-width: 720px) {
  header { align-items: flex-start; }
  nav { gap: 10px 14px; }
  .hero { padding-top: 48px; }
  .grid { grid-template-columns: 1fr; }
  .document { border-radius: 24px; }
  footer { flex-direction: column; }
}