/* 默认主题：通用、中性、可被任意站点替换 */
:root{
  --c-primary:#1f6feb;
  --c-text:#0f172a;
  --c-muted:#64748b;
  --c-border:#e5e7eb;
  --c-bg:#f8fafc;
  --c-card:#ffffff;
  --radius:12px;
  --max:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--c-text);background:#fff;line-height:1.7;font-size:15px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0;background:#fff;padding:8px 14px;z-index:9999}
.skip-link:focus{left:12px;top:12px}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--c-border);backdrop-filter:blur(8px)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:64px;gap:20px}
.site-logo{font-size:18px;font-weight:700;color:var(--c-text);white-space:nowrap}
.site-logo img{height:32px;width:auto}
.site-nav{display:flex;align-items:center;gap:22px;font-size:14px}
.site-nav a{color:var(--c-muted);padding:6px 0;border-bottom:2px solid transparent}
.site-nav a:hover,.site-nav a.active{color:var(--c-primary);border-bottom-color:var(--c-primary)}
.nav-drop{position:relative}
.nav-drop>a{display:inline-flex;align-items:center;gap:4px}
.nav-drop-panel{position:absolute;top:100%;left:50%;transform:translateX(-50%);min-width:220px;
  background:#fff;border:1px solid var(--c-border);border-radius:10px;box-shadow:0 12px 32px rgba(15,23,42,.1);
  padding:8px;display:none;grid-template-columns:1fr 1fr;gap:2px}
.nav-drop:hover .nav-drop-panel{display:grid}
.nav-drop-panel a{padding:8px 10px;border-radius:6px;font-size:13px;border:0}
.nav-drop-panel a:hover{background:var(--c-bg);color:var(--c-primary)}
.nav-toggle{display:none;border:0;background:transparent;font-size:22px;cursor:pointer}

/* hero */
.hero{padding:72px 0 56px;background:linear-gradient(160deg,#eff6ff 0%,#f8fafc 60%,#fff 100%)}
.hero h1{margin:0 0 14px;font-size:40px;line-height:1.25;letter-spacing:-.5px}
.hero p{margin:0 0 24px;color:var(--c-muted);font-size:16px;max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 22px;
  border-radius:9px;font-size:14px;font-weight:600;border:1px solid transparent}
.btn-primary{background:var(--c-primary);color:#fff}
.btn-ghost{border-color:var(--c-border);background:#fff;color:var(--c-text)}

/* sections */
.section{padding:56px 0}
.section-head{margin-bottom:24px}
.section-head h2{margin:0 0 6px;font-size:26px}
.section-head p{margin:0;color:var(--c-muted);font-size:14px}
.grid{display:grid;gap:16px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden}
.card:hover{box-shadow:0 10px 26px rgba(15,23,42,.07)}
.card-img{aspect-ratio:16/9;background:var(--c-bg);overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-body{padding:16px}
.card-body h3{margin:0 0 8px;font-size:16px;line-height:1.45}
.card-body p{margin:0 0 12px;color:var(--c-muted);font-size:13px;line-height:1.65}
.meta{color:#94a3b8;font-size:12px}
.read-more{color:var(--c-primary);font-size:13px;font-weight:600}

/* categories */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.cat-item{padding:16px;border:1px solid var(--c-border);border-radius:10px;background:var(--c-bg)}
.cat-item strong{display:block;font-size:14px;margin-bottom:4px}
.cat-item span{font-size:12px;color:var(--c-muted)}

/* list */
.page-banner{padding:44px 0 32px;background:var(--c-bg);border-bottom:1px solid var(--c-border)}
.page-banner h1{margin:0 0 6px;font-size:30px}
.page-banner p{margin:0;color:var(--c-muted);font-size:14px}
.breadcrumb{font-size:12px;color:#94a3b8;margin-bottom:10px}
.breadcrumb a{color:#64748b}
.list{padding:40px 0 56px}
.list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.list-card{display:flex;flex-direction:column}
.pagination{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:32px}
.pagination a,.pagination span{min-width:34px;height:34px;padding:0 10px;display:inline-flex;align-items:center;
  justify-content:center;border:1px solid var(--c-border);border-radius:7px;font-size:13px;color:#475569}
.pagination .active{background:var(--c-primary);border-color:var(--c-primary);color:#fff}

/* article */
.article{padding:40px 0 56px}
.article-head{margin-bottom:24px}
.article-head h1{margin:0 0 10px;font-size:30px;line-height:1.35}
.article-meta{color:#94a3b8;font-size:12px;display:flex;flex-wrap:wrap;gap:12px}
.article-body{font-size:15px;line-height:1.9;color:#334155}
.article-body h2{margin:32px 0 12px;font-size:20px;color:var(--c-text)}
.article-body h3{margin:24px 0 10px;font-size:17px}
.article-body p{margin:0 0 16px}
.article-body img{border-radius:8px;margin:18px 0}
.article-body blockquote{margin:20px 0;padding:14px 18px;background:var(--c-bg);border-left:3px solid var(--c-primary);
  color:#475569}
.article-body a{color:var(--c-primary);text-decoration:underline}
.article-body pre{overflow:auto;background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:8px;font-size:13px}
.article-body code{background:#f1f5f9;padding:1px 5px;border-radius:4px;font-size:13px}

/* page */
.page{padding:44px 0 56px}
.page h1{margin:0 0 20px;font-size:30px}
.page-content{font-size:15px;line-height:1.9;color:#334155}

/* empty */
.empty{padding:48px 0;text-align:center;color:#94a3b8;font-size:14px}

/* footer */
.site-footer{margin-top:24px;background:#0f172a;color:#cbd5e1;padding:40px 0 24px;font-size:13px}
.site-footer .container{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between}
.site-footer a{color:#cbd5e1}
.site-footer a:hover{color:#fff}
.footer-brand strong{display:block;color:#fff;font-size:16px;margin-bottom:8px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:flex-start}
.footer-bottom{margin-top:24px;padding-top:16px;border-top:1px solid rgba(255,255,255,.12);
  color:#94a3b8;font-size:12px;display:flex;flex-wrap:wrap;gap:8px 16px;justify-content:space-between}

/* mobile */
@media(max-width:900px){
  .grid-3,.list-grid{grid-template-columns:repeat(2,1fr)}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .site-header .container{height:58px}
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;top:58px;left:0;right:0;background:#fff;
    flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 16px;
    border-bottom:1px solid var(--c-border);box-shadow:0 12px 24px rgba(15,23,42,.08)}
  .site-nav.open{display:flex}
  .site-nav a{padding:11px 4px;border-bottom:1px solid #f1f5f9}
  .nav-drop-panel{position:static;transform:none;display:grid;box-shadow:none;border:0;padding:0 0 0 12px}
  .hero{padding:48px 0 40px}
  .hero h1{font-size:29px}
  .hero p{font-size:14px}
  .section{padding:40px 0}
  .grid-3,.grid-2,.list-grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:1fr 1fr}
  .page-banner{padding:32px 0 26px}
  .page-banner h1,.article-head h1,.page h1{font-size:24px}
  .article,.page,.list{padding:28px 0 44px}
  .site-footer .container{flex-direction:column}
}