/* ============ 内容页（使用说明 / 博客）=========== */
:root {
  --site-max: 860px;
  --brand: #2563eb;
  --brand-dark: #1e40af;
  --text: #1e293b;
  --text-2: #475569;
  --text-3: #94a3b8;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
}

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 15.5px;
}

.site-header {
  background: linear-gradient(135deg, #2563eb, #1e40af);
  color: #fff;
  padding: 0 20px;
}
.site-header .inner {
  max-width: var(--site-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 58px;
}
.site-logo { font-weight: 700; font-size: 17px; text-decoration: none; color: #fff; }
.site-nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.site-nav a {
  color: rgba(255, 255, 255, .88);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 13px;
  border-radius: 18px;
  transition: background .15s;
}
.site-nav a:hover, .site-nav a.active { background: rgba(255, 255, 255, .18); color: #fff; }

.site-main { max-width: var(--site-max); margin: 0 auto; padding: 36px 20px 60px; }

.site-breadcrumb { font-size: 13px; color: var(--text-3); margin-bottom: 18px; }
.site-breadcrumb a { color: var(--brand); text-decoration: none; }

h1.article-title { font-size: 27px; line-height: 1.45; margin: 10px 0 12px; }
.article-meta { font-size: 13px; color: var(--text-3); margin-bottom: 8px; }
.article-abstract {
  background: #eff6ff;
  border-left: 4px solid var(--brand);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  color: var(--text-2);
  font-size: 14.5px;
  margin: 18px 0 26px;
}

.site-main h2 {
  font-size: 20px;
  margin: 34px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--brand);
  line-height: 1.4;
}
.site-main h3 { font-size: 16.5px; margin: 22px 0 8px; }
.site-main p { margin: 10px 0; color: var(--text-2); }
.site-main ul, .site-main ol { margin: 10px 0 10px 24px; color: var(--text-2); }
.site-main li { margin: 5px 0; }
.site-main strong { color: var(--text); }
.site-main a { color: var(--brand); }

.site-main table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.site-main th, .site-main td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.site-main th { background: #f1f5f9; }

.tip-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  padding: 12px 16px;
  margin: 14px 0;
  font-size: 14.5px;
  color: #166534;
}

/* 博客索引卡片 */
.blog-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 20px; }
.blog-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  text-decoration: none;
  color: var(--text);
  display: block;
  transition: box-shadow .18s, transform .18s, border-color .18s;
}
.blog-card:hover {
  box-shadow: 0 10px 30px rgba(15, 23, 42, .1);
  transform: translateY(-2px);
  border-color: #bfdbfe;
}
.blog-card .bc-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--brand);
  background: #eff6ff;
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 8px;
}
.blog-card h2 { font-size: 18px; margin: 4px 0 8px; border: none; padding: 0; }
.blog-card p { font-size: 14px; color: var(--text-2); margin: 0; }
.blog-card .bc-meta { font-size: 12.5px; color: var(--text-3); margin-top: 10px; }

/* 文内 CTA */
.cta-card {
  background: linear-gradient(135deg, #2563eb, #1e40af);
  color: #fff;
  border-radius: 14px;
  padding: 24px 26px;
  margin: 34px 0 10px;
}
.cta-card h3 { color: #fff; margin: 0 0 6px; font-size: 18px; }
.cta-card p { color: rgba(255, 255, 255, .85); font-size: 14.5px; margin: 0 0 14px; }
.cta-btn {
  display: inline-block;
  background: #fff;
  color: var(--brand-dark);
  font-weight: 600;
  font-size: 15px;
  padding: 9px 26px;
  border-radius: 22px;
  text-decoration: none;
}

/* 相关文章 */
.related { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); }
.related h3 { font-size: 15px; color: var(--text-3); margin-bottom: 10px; }
.related a {
  display: block;
  padding: 8px 0;
  color: var(--text);
  text-decoration: none;
  font-size: 14.5px;
  border-bottom: 1px dashed var(--border);
}
.related a:hover { color: var(--brand); }

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--card);
  padding: 22px 20px;
  text-align: center;
  color: var(--text-3);
  font-size: 13px;
}
.site-footer a { color: var(--brand); text-decoration: none; }