:root {
  color-scheme: light;
  --ink: #17324d;
  --muted: #607286;
  --line: #d9e4ec;
  --accent: #2673aa;
  --surface: rgba(255, 255, 255, 0.94);
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 18%, rgba(54, 142, 190, 0.14), transparent 34rem),
    linear-gradient(145deg, #f5f9fc 0%, #eaf2f7 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
}

.shell {
  min-height: 100vh;
  display: grid;
  align-items: start;
  justify-items: center;
  padding: clamp(54px, 11vh, 112px) 20px 32px;
}

.card {
  width: min(680px, 100%);
  padding: clamp(34px, 7vw, 68px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(23, 50, 77, 0.12);
}

.mark {
  display: inline-grid;
  place-items: center;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border-radius: 999px;
  color: white;
  background: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.eyebrow {
  margin: 28px 0 10px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 7vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.04em;
}

.summary {
  max-width: 36rem;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2.8vw, 19px);
  line-height: 1.8;
}

.rule {
  width: 100%;
  height: 1px;
  margin: 34px 0 20px;
  background: var(--line);
}

.note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.home-link {
  display: inline-flex;
  margin-top: 28px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 12px;
  color: white;
  background: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.home-link:focus-visible {
  outline: 3px solid rgba(38, 115, 170, 0.3);
  outline-offset: 3px;
}

@media (max-width: 520px) {
  .shell { padding: 32px 16px 16px; }
  .card { border-radius: 22px; }
}