:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --border: #e5e7eb;
  --card: #f9fafb;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  border-bottom: 1px solid var(--border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

header.site .brand {
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

header.site .tagline {
  font-size: 14px;
  color: var(--muted);
  margin-top: 4px;
}

h1 {
  font-size: 32px;
  line-height: 1.3;
  margin: 0 0 12px;
}

h2 {
  font-size: 20px;
  line-height: 1.4;
  margin: 40px 0 12px;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

h3 {
  font-size: 16px;
  margin: 24px 0 8px;
}

p,
li {
  color: #2c2c2c;
}

p.zh,
li.zh,
.zh {
  color: #1a1a1a;
}

p.en,
li.en,
.en {
  color: var(--muted);
  font-size: 14px;
}

ul {
  padding-left: 22px;
}

ul li {
  margin: 6px 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.back-link {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--muted);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 8px;
}

.cta-row a {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--fg);
  font-size: 14px;
}

.cta-row a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  text-decoration: none;
}

.contact-card {
  margin-top: 24px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

.contact-card .row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
}

.contact-card .row:last-child {
  border-bottom: none;
}

.contact-card .label {
  color: var(--muted);
}

.notice {
  margin-top: 32px;
  padding: 16px 18px;
  border-left: 4px solid #f59e0b;
  background: #fffbeb;
  border-radius: 4px;
  font-size: 14px;
  color: #78350f;
}

footer.site {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.beian {
  margin-top: 18px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

.beian a {
  color: var(--muted);
  text-decoration: none;
}

.beian a:hover {
  color: var(--accent);
  text-decoration: underline;
}

@media (max-width: 480px) {
  .container {
    padding: 32px 18px 64px;
  }
  h1 {
    font-size: 26px;
  }
  .contact-card .row {
    flex-direction: column;
    gap: 2px;
  }
}