:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --border: #e5e7eb;
  --code-bg: #0f172a;
  --code-text: #e5e7eb;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
  line-height: 1.8;
}

a { color: inherit; text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.logo {
  font-weight: 800;
  color: #111827;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a:hover { color: var(--primary); }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 42px 20px 70px;
}

.hero {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 46px;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 14px;
  font-size: 38px;
  line-height: 1.25;
  color: #111827;
}

.hero p { color: var(--muted); margin: 0; font-size: 17px; }

.meta-line {
  margin-top: 22px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 13px;
  border: 1px solid #bfdbfe;
}

.section { margin-top: 34px; }

.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.section-title h2 {
  margin: 0;
  font-size: 24px;
  color: #111827;
}

.section-title span {
  color: var(--muted);
  font-size: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.item, .article-card, .content-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.05);
}

.item {
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.item:hover {
  transform: translateY(-3px);
  border-color: #bfdbfe;
  box-shadow: 0 16px 35px rgba(37, 99, 235, 0.12);
}

.item h3, .article-card h3 {
  margin: 0 0 8px;
  color: #111827;
  font-size: 18px;
}

.item p, .article-card p, .content-card p, .content-card li { color: #4b5563; }

.read-more {
  display: inline-flex;
  margin-top: 12px;
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.content-card h2 {
  margin-top: 0;
  color: #111827;
}

.content-card h3 {
  margin-top: 24px;
  color: #1d4ed8;
}

pre {
  overflow-x: auto;
  padding: 16px;
  border-radius: 14px;
  background: var(--code-bg);
  color: var(--code-text);
  font-size: 14px;
  line-height: 1.7;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 14px;
  background: #fff;
}

.table th, .table td {
  border: 1px solid var(--border);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

.table th { background: #f8fafc; color: #111827; }

.notice {
  margin-top: 26px;
  padding: 18px;
  background: #f8fafc;
  border-left: 4px solid #94a3b8;
  border-radius: 12px;
  color: #475569;
}

.footer {
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding: 28px 20px 36px;
  background: rgba(255,255,255,.65);
  font-size: 14px;
}

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

.breadcrumb {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 16px;
}

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

@media (max-width: 720px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .hero { padding: 30px 24px; }
  .hero h1 { font-size: 30px; }
}