:root {
  --bg: #0b1120;
  --bg-card: #111a2e;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --up: #ef4444;
  --border: #1e293b;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 17, 32, 0.9);
}

.site-header .nav {
  max-width: 820px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header .brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
}

.site-header .brand span { color: var(--accent); }

.site-header .links a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 14px;
}

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

main.article {
  max-width: 820px;
  margin: 0 auto;
  padding: 36px 20px 60px;
}

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

.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }

article h1 {
  font-size: 28px;
  line-height: 1.4;
  margin-bottom: 12px;
}

.meta {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

article h2 {
  font-size: 21px;
  margin: 32px 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
}

article h3 {
  font-size: 17px;
  margin: 24px 0 10px;
}

article p { margin-bottom: 14px; color: var(--text); }

article ul, article ol {
  margin: 0 0 16px 22px;
}

article li { margin-bottom: 8px; }

article strong { color: var(--accent-hover); }

article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

article th, article td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

article th { background: var(--bg-card); }

blockquote {
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  padding: 14px 18px;
  margin: 16px 0;
  border-radius: 0 8px 8px 0;
  color: var(--text-muted);
}

.cta-box {
  background: linear-gradient(135deg, #0e2a47, #111a2e);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 26px;
  margin: 36px 0 8px;
  text-align: center;
}

.cta-box h2 {
  border: none;
  padding: 0;
  margin: 0 0 10px;
  font-size: 20px;
}

.cta-box p { color: var(--text-muted); font-size: 14px; }

.cta-btn {
  display: inline-block;
  margin-top: 14px;
  padding: 12px 32px;
  background: var(--accent);
  color: #0b1120;
  font-weight: 700;
  text-decoration: none;
  border-radius: 8px;
  font-size: 16px;
}

.cta-btn:hover { background: var(--accent-hover); }

.related {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.related h2 { border: none; padding: 0; font-size: 17px; margin: 0 0 12px; }

.related a {
  color: var(--accent);
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
}

.related a:hover { text-decoration: underline; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.site-footer a { color: var(--text-muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

@media (max-width: 640px) {
  article h1 { font-size: 23px; }
  article h2 { font-size: 19px; }
  main.article { padding: 24px 16px 48px; }
}