:root {
  color-scheme: dark;
  --bg: #080b14;
  --surface: rgba(18, 24, 42, 0.78);
  --surface-strong: #151c31;
  --text: #f7f4ed;
  --muted: #b5bdd0;
  --accent: #b8a4ff;
  --accent-2: #82d7ca;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 12%, rgba(111, 86, 220, 0.24), transparent 34rem),
    radial-gradient(circle at 88% 22%, rgba(56, 169, 158, 0.17), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  line-height: 1.75;
}

a { color: var(--accent-2); }
a:hover { color: #b4fff2; }

.shell { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
}

.brand {
  color: var(--text);
  font-weight: 750;
  letter-spacing: 0.02em;
  text-decoration: none;
}

nav { display: flex; gap: 20px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.94rem; }

.hero { padding: 104px 0 84px; max-width: 820px; }

.eyebrow {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid rgba(184, 164, 255, 0.35);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(184, 164, 255, 0.08);
  font-size: 0.86rem;
}

h1 {
  margin: 22px 0 18px;
  font-size: clamp(2.6rem, 8vw, 5.8rem);
  line-height: 1.05;
  letter-spacing: -0.055em;
}

.lead { max-width: 680px; color: var(--muted); font-size: clamp(1.08rem, 2vw, 1.28rem); }

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding-bottom: 90px;
}

.card, .document {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.card { padding: 28px; }
.card h2 { margin-top: 0; font-size: 1.12rem; }
.card p { margin-bottom: 0; color: var(--muted); }

.document { max-width: 860px; margin: 64px auto 90px; padding: clamp(28px, 6vw, 64px); }
.document h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
.document h2 { margin-top: 2.2em; line-height: 1.3; }
.document p, .document li { color: var(--muted); }
.updated { color: var(--accent-2); font-size: 0.9rem; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer div { display: flex; gap: 18px; flex-wrap: wrap; }

@media (max-width: 760px) {
  header { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 64px; }
  .grid { grid-template-columns: 1fr; }
}