:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #677084;
  --blue: #2578f5;
  --blue-soft: #eaf3ff;
  --surface: rgba(255, 255, 255, 0.9);
  --line: rgba(30, 48, 78, 0.1);
  --shadow: 0 18px 55px rgba(32, 73, 135, 0.11);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 85% 5%, #dcecff 0, transparent 31rem),
    radial-gradient(circle at 5% 65%, #e8f7f0 0, transparent 28rem),
    #f5f7fb;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(18px);
  background: rgba(247, 249, 253, 0.83);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: 980px;
  margin: auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 22px;
}

.brand {
  margin-right: auto;
  color: var(--ink);
  font-size: 18px;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  margin-right: 9px;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(145deg, #2996ff, #7558f5);
  color: white;
  box-shadow: 0 6px 16px rgba(47, 113, 239, 0.25);
}

.nav-links { display: flex; gap: 18px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--blue); }

main { max-width: 900px; margin: auto; padding: 64px 22px 90px; }

.hero { max-width: 720px; padding: 40px 0 55px; }
.eyebrow { color: var(--blue); font-size: 14px; font-weight: 700; letter-spacing: .08em; }
h1 { margin: 10px 0 18px; font-size: clamp(38px, 7vw, 68px); line-height: 1.08; letter-spacing: -.04em; }
.lead { color: var(--muted); font-size: clamp(18px, 3vw, 22px); }

.button {
  display: inline-block;
  margin-top: 16px;
  padding: 11px 18px;
  border-radius: 999px;
  color: white;
  background: var(--blue);
  text-decoration: none;
  font-weight: 650;
}

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card, .document {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.card { padding: 24px; }
.card h2 { margin: 8px 0; font-size: 19px; }
.card p { margin: 0; color: var(--muted); }
.icon { font-size: 28px; }

.document { padding: clamp(24px, 6vw, 58px); }
.document h1 { font-size: clamp(32px, 6vw, 48px); }
.document h2 { margin-top: 34px; font-size: 21px; }
.document li { margin: 7px 0; }
.meta, .note { color: var(--muted); }
.note { padding: 15px 18px; border-radius: 14px; background: var(--blue-soft); }

footer { max-width: 900px; margin: auto; padding: 24px 22px 44px; color: var(--muted); font-size: 13px; }
footer a { color: inherit; }

@media (max-width: 700px) {
  .nav { align-items: flex-start; flex-wrap: wrap; }
  .nav-links { width: 100%; overflow-x: auto; padding-bottom: 3px; }
  .nav-links a { white-space: nowrap; }
  main { padding-top: 35px; }
  .grid { grid-template-columns: 1fr; }
}