:root {
  --primary: #1a365d;
  --accent: #ed8936;
  --bg: #f7fafc;
  --card: #ffffff;
  --text: #1a202c;
  --muted: #4a5568;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

header {
  background: linear-gradient(135deg, var(--primary), #2c5282);
  color: #fff;
  padding: 2.5rem 1.5rem;
}

header .wrap,
main .wrap,
footer .wrap {
  max-width: 820px;
  margin: 0 auto;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

header p {
  margin: 0;
  opacity: 0.9;
}

nav.top {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav.top a {
  color: #fff;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
}

main {
  padding: 2rem 1.5rem 3rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  color: var(--primary);
}

.card p,
.card li {
  color: var(--muted);
}

.card ul {
  padding-left: 1.25rem;
}

.meta {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

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

.badge-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.badge {
  background: #ebf8ff;
  color: var(--primary);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --muted: #cbd5e1;
    --border: #334155;
  }

  .badge {
    background: #1e3a5f;
  }
}