:root {
  color-scheme: light;
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1c1c1e;
  --text-muted: #6b6b6f;
  --border: #e5e5e3;
  --accent: #2563eb;
  --max-width: 720px;
}

* {
  box-sizing: border-box;
}

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

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

header.site-header .brand {
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  text-decoration: none;
}

header.site-header nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  margin-left: 20px;
}

header.site-header nav a:hover {
  color: var(--accent);
}

h1 {
  font-size: 28px;
  margin-bottom: 4px;
}

h2 {
  font-size: 19px;
  margin-top: 40px;
  margin-bottom: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

h2:first-of-type {
  border-top: none;
}

p {
  margin: 12px 0;
  color: var(--text);
}

ul {
  margin: 12px 0;
  padding-left: 22px;
}

li {
  margin: 4px 0;
}

.meta {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 24px;
}

.tagline {
  color: var(--text-muted);
  font-size: 16px;
  margin-top: 0;
}

.hero {
  text-align: center;
  padding: 56px 0 32px;
}

.hero .app-name-en {
  color: var(--text-muted);
  font-size: 15px;
  margin-top: -4px;
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin: 32px 0;
}

.card-links a {
  display: block;
  padding: 12px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}

.card-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.feature-list {
  display: grid;
  gap: 12px;
  margin: 24px 0;
}

.feature-list li {
  list-style: none;
  margin: 0;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

footer.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  padding: 32px 20px 48px;
}

footer.site-footer a {
  color: var(--text-muted);
}

.faq-item {
  margin: 24px 0;
}

.faq-item h2 {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
  font-size: 16px;
}

.faq-item + .faq-item h2 {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  margin-top: 24px;
}