:root {
  --bg: #ffffff;
  --text: #1c2128;
  --muted: #57606a;
  --card: #f6f8fa;
  --border: #d0d7de;
  --accent: #1f6feb;
  --accent-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --text: #e6edf3;
    --muted: #8d96a0;
    --card: #161b22;
    --border: #30363d;
    --accent: #4493f8;
    --accent-text: #0d1117;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  padding: 96px 0 64px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}

h1 {
  margin: 8px 0 16px;
  font-size: clamp(2.5rem, 7vw, 3.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 1.125rem;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0 0;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  text-decoration: none;
}

.btn:hover { opacity: 0.88; }

.btn.ghost {
  background: transparent;
  color: var(--accent);
}

section { padding: 56px 0 0; }

h2 {
  margin: 0 0 20px;
  font-size: 1.5rem;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.125rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (max-width: 600px) {
  .grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 48px; }
}

.card {
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

.card p { margin: 0; color: var(--muted); }
.card p + p { margin-top: 8px; }

.card .meta {
  font-size: 0.875rem;
  color: var(--accent);
}

.list {
  margin: 0;
  padding-left: 1.25em;
  color: var(--muted);
}

.list li + li { margin-top: 8px; }

.foot {
  padding-top: 64px;
  padding-bottom: 40px;
  color: var(--muted);
  font-size: 0.875rem;
}