/* ===== 主站模板：SEO 文章版（v7） ===== */
:root{--primary:#6d28d9;--primary-2:#8b5cf6;--accent:#06b6d4;--dark:#0b1120;--text:#1f2937;--muted:#6b7280;--bg:#f6f7fb;--card:#ffffff;--line:#e5e7eb;--radius:14px;--shadow:0 8px 24px rgba(17,24,39,.06)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body.mt-body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
img{max-width:100%;height:auto}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--accent)}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:8px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:99}
/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:66px}
.brand-logo{height:42px;display:block}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--dark);transition:.25s}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.main-nav{display:flex;list-style:none;gap:6px;align-items:center}
.main-nav-item{position:relative}
.main-nav-link{display:block;padding:10px 14px;border-radius:10px;color:var(--text);font-weight:600;font-size:15px}
.main-nav-link:hover{background:linear-gradient(135deg,rgba(109,40,217,.08),rgba(6,182,212,.08));color:var(--primary)}
.sub-nav{position:absolute;top:100%;left:0;min-width:170px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);list-style:none;padding:8px;display:none;flex-direction:column;gap:2px}
.main-nav-item:hover .sub-nav{display:flex}
.sub-nav a{display:block;padding:8px 12px;border-radius:8px;color:var(--text);font-size:14px}
.sub-nav a:hover{background:var(--bg);color:var(--primary)}
/* Hero */
.hero{background:linear-gradient(135deg,#0b1120 0%,#312e81 55%,#6d28d9 100%);color:#fff;padding:84px 0 72px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-140px;top:-140px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(6,182,212,.35),transparent 65%)}
.hero-badge{display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);padding:6px 16px;border-radius:999px;font-size:14px;letter-spacing:.5px}
.hero-title{font-size:clamp(28px,4.6vw,46px);line-height:1.25;margin:18px 0 14px;font-weight:800}
.hero-desc{font-size:16px;color:rgba(255,255,255,.82);max-width:640px}
.hero-actions{margin-top:26px;display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{margin-top:40px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:720px}
.stat{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:var(--radius);padding:16px;text-align:center}
.stat strong{display:block;font-size:24px;color:#fff}
.stat span{font-size:13px;color:rgba(255,255,255,.72)}
/* Buttons */
.btn{display:inline-block;padding:12px 26px;border-radius:12px;font-weight:700;font-size:15px;transition:.2s;border:2px solid transparent}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff}
.btn-primary:hover{filter:brightness(1.1);color:#fff}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-outline-light{border-color:rgba(255,255,255,.5);color:#fff}
.btn-outline-light:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-gold{background:linear-gradient(135deg,#d4a017,#f0c24b);color:#14351f}
.btn-gold:hover{filter:brightness(1.06);color:#14351f}
.btn-ghost-dark{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost-dark:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-lg{padding:15px 34px;font-size:16px}
/* Sections */
.page-section{padding:56px 0 8px}
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}
.section-title{font-size:26px;font-weight:800;position:relative;padding-left:14px}
.section-title::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:5px;border-radius:4px;background:linear-gradient(180deg,var(--primary),var(--accent))}
.section-more{font-size:14px;color:var(--muted)}
.page-band{margin-top:48px;padding:56px 0;background:linear-gradient(135deg,rgba(109,40,217,.05),rgba(6,182,212,.05));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feature-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;box-shadow:var(--shadow)}
.feature-ico{font-size:30px}
.feature-card h3{margin:10px 0 6px;font-size:17px}
.feature-card p{font-size:14px;color:var(--muted)}
.center-cta{text-align:center;padding:36px 0 24px}
/* Article cards（由渲染管线输出 .article-card 结构） */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.article-stream{display:flex;flex-direction:column;gap:16px}
.article-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.article-stream .article-card{flex-direction:row}
.article-card:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(17,24,39,.10)}
.article-thumb{flex:0 0 auto;height:150px;display:flex;align-items:center;justify-content:center;font-size:40px;background:linear-gradient(135deg,rgba(109,40,217,.08),rgba(6,182,212,.10));overflow:hidden}
.article-stream .article-thumb{width:210px;height:auto;min-height:120px}
.article-thumb img{width:100%;height:100%;object-fit:cover}
.article-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.article-meta{display:flex;gap:14px;font-size:13px;color:var(--muted)}
.article-title{font-size:17px;line-height:1.45}
.article-title a{color:var(--dark)}
.article-title a:hover{color:var(--primary)}
.article-summary{font-size:14px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.article-more{font-size:14px;font-weight:600;margin-top:auto}
/* Pagination */
.pagination{display:flex;gap:8px;justify-content:center;margin:26px 0;flex-wrap:wrap}
.pagination a,.pagination .current{padding:8px 14px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:14px;color:var(--text)}
.pagination .current{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-color:transparent;font-weight:700}
/* 内容布局（列表/详情双栏） */
.page-hero{padding:34px 0 0}
.content-layout{display:grid;grid-template-columns:1fr 300px;gap:26px;padding-top:22px;padding-bottom:48px}
.page-title{font-size:30px;font-weight:800;margin-top:10px}
.page-subtitle{color:var(--muted);margin:6px 0 20px}
.breadcrumb{font-size:13px;color:var(--muted)}
.crumb-sep{margin:0 8px}
.content-aside{display:flex;flex-direction:column;gap:18px}
.sidebar-box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.sidebar-title{font-size:16px;margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.sidebar-list-wrap,.sidebar-list{display:flex;flex-direction:column;gap:2px}
.sidebar-article-item{padding:8px 4px;border-bottom:1px dashed var(--line);font-size:14px;line-height:1.55}
.sidebar-article-item:last-child{border-bottom:0}
.sidebar-category-list{list-style:none;display:flex;flex-direction:column;gap:2px}
.sidebar-category-list a{display:flex;justify-content:space-between;padding:9px 6px;border-radius:8px;color:var(--text);font-size:14px}
.sidebar-category-list a:hover{background:var(--bg);color:var(--primary)}
.sidebar-category-count{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:999px;font-size:12px;padding:0 8px;line-height:18px}
/* Detail */
.detail-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);margin-top:16px}
.detail-title{font-size:26px;line-height:1.4}
.detail-meta{display:flex;gap:18px;color:var(--muted);font-size:13px;margin:12px 0 20px;flex-wrap:wrap}
.detail-cover{margin-bottom:20px}
.detail-cover:empty{display:none}
.detail-cover img{border-radius:12px;width:100%}
.article-content{font-size:15.5px;color:#374151;word-break:break-word}
.article-content p{margin:12px 0}
.article-content img{border-radius:10px;margin:10px auto}
.article-content h1,.article-content h2,.article-content h3{margin:22px 0 10px;color:var(--dark)}
.article-content ul,.article-content ol{padding-left:24px;margin:10px 0}
.article-content table{width:100%;border-collapse:collapse;margin:14px 0}
.article-content td,.article-content th{border:1px solid var(--line);padding:8px 10px}
.article-tags-row{margin-top:22px;display:flex;gap:8px;flex-wrap:wrap}
.article-tags-row:empty{display:none}
.article-tag{background:linear-gradient(135deg,rgba(109,40,217,.1),rgba(6,182,212,.12));color:var(--primary);border-radius:999px;padding:3px 12px;font-size:13px}
.article-nav-row{margin-top:22px;display:flex;flex-direction:column;gap:10px}
.article-nav-prev,.article-nav-next{background:var(--bg);border-radius:10px;padding:12px 16px;font-size:14px}
.article-nav-row:empty{display:none}
.article-nav-prev span,.article-nav-next span{color:var(--muted);display:block;font-size:12px}
/* Prose / FAQ / Contact */
.prose-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);margin-top:18px}
.faq-list{margin-top:18px;display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:4px 18px}
.faq-item summary{cursor:pointer;font-weight:700;padding:12px 0;font-size:15.5px}
.faq-item div{padding:0 0 14px;color:var(--muted);font-size:14.5px}
.faq-item p{margin:6px 0}
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px}
.contact-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;text-align:center;box-shadow:var(--shadow)}
.contact-ico{font-size:32px}
.contact-card h3{margin:8px 0 4px;font-size:16px}
.contact-card p{color:var(--muted);font-size:14px}
/* Footer */
.site-footer{background:var(--dark);color:rgba(255,255,255,.78);margin-top:64px;padding:52px 0 0}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.2fr;gap:34px;padding-bottom:34px}
.footer-col h4{color:#fff;margin-bottom:14px;font-size:16px}
.footer-about{font-size:13.5px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.footer-contact-line{font-size:13.5px;margin-top:6px}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:8px}
.footer-links a{color:rgba(255,255,255,.75);font-size:13.5px}
.footer-links a:hover{color:#fff}
.friend-links-area{border-top:1px solid rgba(255,255,255,.1);padding:18px 0}
.friend-links-title{font-size:14px;color:#fff;margin-bottom:10px}
.friend-links{display:flex;flex-wrap:wrap;gap:10px 18px}
.friend-links a{color:rgba(255,255,255,.66);font-size:13px}
.friend-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:16px 0 18px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;font-size:13px}
.sitemap-links{display:flex;gap:10px;align-items:center}
.sitemap-links a{color:rgba(255,255,255,.66)}
.back-top{position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:50%;border:0;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:18px;cursor:pointer;opacity:0;pointer-events:none;transition:.25s;z-index:60}
.back-top.show{opacity:1;pointer-events:auto}
/* Responsive */
@media (max-width:960px){
  .article-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .content-layout{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);display:none;padding:10px 16px 16px;box-shadow:var(--shadow)}
  .site-nav.nav-open{display:block}
  .main-nav{flex-direction:column;align-items:stretch;gap:2px}
  .sub-nav{position:static;display:flex;box-shadow:none;border:0;padding-left:18px}
}
@media (max-width:600px){
  .article-grid,.feature-grid,.contact-cards{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .article-stream .article-card{flex-direction:column}
  .article-stream .article-thumb{width:100%;height:170px}
  .hero{padding:60px 0 48px}
  .footer-bottom{flex-direction:column;text-align:center}
}