:root {
  --bg: #f7f8fa;
  --text: #1f2933;
  --accent: #f6821f;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --text: #e6e9ee;
    --card: #1e232b;
  }
}

* { box-sizing: border-box; }

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

header {
  text-align: center;
  padding: 64px 16px 40px;
}

header h1 { margin: 0 0 8px; font-size: 2rem; }
.subtitle { margin: 0; opacity: 0.7; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

section {
  background: var(--card);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 20px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

h2 {
  margin-top: 0;
  border-left: 4px solid var(--accent);
  padding-left: 10px;
  font-size: 1.25rem;
}

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

footer {
  text-align: center;
  padding: 24px 16px 48px;
  opacity: 0.6;
  font-size: 0.9rem;
}