/* PEDD 站点样式（博客列表 / 文章页 / 导航 / 页脚） */
:root{
  --primary:#2563eb; --primary-dark:#1d4ed8; --accent:#059669;
  --bg:#f8fafc; --card:#ffffff; --text:#1e293b; --muted:#64748b;
  --border:#e2e8f0; --navy:#0f172a;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.container-narrow{max-width:780px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.site-nav{position:sticky;top:0;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:100}
.site-nav .inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.site-logo{font-weight:800;font-size:19px;color:var(--text);letter-spacing:-.2px;white-space:nowrap;text-decoration:none}
.site-logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:26px;font-size:15px}
.nav-links a{color:var(--text);font-weight:500;text-decoration:none}
.nav-links a:hover{color:var(--primary)}
.nav-actions{display:flex;align-items:center;gap:12px}
.lang-switch{display:flex;align-items:center;border:1px solid var(--border);border-radius:999px;overflow:hidden;font-size:13px;background:#fff}
.lang-switch a{padding:6px 12px;color:var(--muted);font-weight:600}
.lang-switch a.active{background:var(--primary);color:#fff}
.btn{display:inline-block;background:var(--primary);color:#fff;font-weight:600;padding:11px 22px;border-radius:9px;font-size:15px;transition:.2s;text-decoration:none}
.btn:hover{background:var(--primary-dark);color:#fff}
.btn-sm{padding:8px 16px;font-size:14px}

/* ---------- 页面头部 ---------- */
.page-hero{padding:56px 0 40px;background:linear-gradient(180deg,#eff6ff 0%,var(--bg) 100%);text-align:center}
.page-hero h1{font-size:36px;font-weight:800;letter-spacing:-.5px;margin-bottom:12px}
.page-hero p{color:var(--muted);font-size:16.5px;max-width:620px;margin:0 auto}

/* ---------- 文章卡片网格 ---------- */
.posts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;padding:48px 0 64px}
.post-card{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;transition:.25s}
.post-card:hover{box-shadow:0 12px 32px rgba(15,23,42,.10);transform:translateY(-4px);border-color:#cbd5e1}
.post-thumb{height:8px;background:linear-gradient(90deg,#2563eb,#38bdf8)}
.post-body{padding:24px;display:flex;flex-direction:column;flex:1}
.post-cat{display:inline-block;font-size:12px;font-weight:600;color:var(--primary);background:#eff6ff;padding:4px 11px;border-radius:999px;margin-bottom:14px;align-self:flex-start}
.post-card h2{font-size:18px;line-height:1.5;margin-bottom:10px;font-weight:700}
.post-card h2 a{color:var(--text)}
.post-card h2 a:hover{color:var(--primary)}
.post-card p{font-size:14.5px;color:var(--muted);flex:1;margin-bottom:18px}
.post-meta{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:#94a3b8;border-top:1px solid var(--border);padding-top:14px}
.read-more{font-weight:600;color:var(--primary);font-size:14px}

/* ---------- 文章正文 ---------- */
.article-wrap{background:#fff;border-bottom:1px solid var(--border)}
.article-head{padding:52px 0 34px;background:linear-gradient(180deg,#eff6ff 0%,#fff 100%)}
.breadcrumb{font-size:13.5px;color:var(--muted);margin-bottom:18px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--primary)}
.article-head h1{font-size:38px;line-height:1.35;font-weight:800;letter-spacing:-.6px;margin-bottom:16px}
.article-meta{display:flex;gap:18px;font-size:14px;color:var(--muted);flex-wrap:wrap}
.article-meta .tag{color:var(--primary);background:#eff6ff;padding:3px 11px;border-radius:999px;font-weight:600;font-size:13px}
.article-body{padding:8px 0 56px}
.prose{font-size:17px;line-height:1.95;color:#1f2937;max-width:780px;margin:0 auto}
.prose h2{font-size:24px;font-weight:800;margin:44px 0 14px;letter-spacing:-.3px;padding-left:14px;border-left:4px solid var(--primary);line-height:1.4}
.prose h3{font-size:19px;font-weight:700;margin:30px 0 10px}
.prose p{margin-bottom:18px}
.prose ul,.prose ol{margin:0 0 20px 22px}
.prose li{margin-bottom:9px}
.prose code{background:#f1f5f9;border:1px solid var(--border);border-radius:5px;padding:1px 6px;font-size:14.5px;font-family:ui-monospace,Consolas,monospace;color:#0f172a}
.prose strong,.prose b{color:#0f172a;font-weight:700}
.prose a{border-bottom:1px solid rgba(37,99,235,.35)}
.prose blockquote{border-left:4px solid #cbd5e1;padding:6px 0 6px 20px;color:var(--muted);margin:24px 0}

/* CTA 卡片 */
.cta-card{margin:44px auto 0;max-width:780px;background:linear-gradient(135deg,#1d4ed8,#2563eb);border-radius:18px;padding:34px;color:#fff;text-align:center}
.cta-card h3{font-size:22px;margin-bottom:10px;font-weight:800}
.cta-card p{color:#dbeafe;font-size:15px;margin-bottom:20px}
.cta-card .btn{background:#fff;color:var(--primary)}
.cta-card .btn:hover{background:#eff6ff}

/* 相关文章 */
.related{padding:8px 0 72px}
.related h3.section-title{font-size:21px;font-weight:800;margin-bottom:22px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.related-item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px;transition:.2s}
.related-item:hover{box-shadow:0 8px 20px rgba(15,23,42,.08)}
.related-item h4{font-size:15.5px;line-height:1.55;margin-bottom:8px}
.related-item h4 a{color:var(--text)}
.related-item span{font-size:12.5px;color:#94a3b8}

/* 分页 */
.pagination{display:flex;gap:8px;justify-content:center;padding:0 0 64px;font-size:14px}
.pagination .page-numbers{padding:9px 15px;border:1px solid var(--border);border-radius:9px;color:var(--text);background:#fff}
.pagination .page-numbers.current{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--navy);color:#94a3b8;padding:48px 0 32px;font-size:14px}
.site-footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;margin-bottom:32px}
.site-footer h4{color:#e2e8f0;font-size:15px;margin-bottom:14px;font-weight:700}
.site-footer a{color:#94a3b8;display:block;margin-bottom:9px;font-size:13.5px}
.site-footer a:hover{color:#fff}
.site-footer .brand{color:#fff;font-size:17px;font-weight:800;margin-bottom:10px}
.site-footer .bottom{border-top:1px solid #1e293b;padding-top:22px;font-size:13px;color:#64748b;text-align:center}

@media(max-width:900px){
  .posts-grid,.related-grid{grid-template-columns:repeat(2,1fr)}
  .site-footer .cols{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
}
@media(max-width:620px){
  .posts-grid,.related-grid{grid-template-columns:1fr}
  .page-hero h1{font-size:27px}
  .article-head h1{font-size:26px}
  .prose{font-size:16px}
  .site-footer .cols{grid-template-columns:1fr}
  .site-logo{font-size:16px}
}