:root{
  --brand:#2557d6;
  --brand-dark:#18388d;
  --ink:#172033;
  --muted:#65728a;
  --line:#e6ebf3;
  --soft:#f5f7fb;
  --card:#ffffff;
  --accent:#ffb13b;
  --success:#18a77a;
  --shadow:0 14px 34px rgba(21,40,88,.10);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.7}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.site-top{background:var(--brand-dark);color:#fff;font-size:14px}
.wrap{width:min(1180px,calc(100% - 32px));margin:0 auto}
.top-inner{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:8px 0;flex-wrap:wrap}
.logo-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:22px 0}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--brand);font-size:28px;letter-spacing:.5px}
.logo-mark{width:46px;height:46px;border-radius:16px;background:linear-gradient(135deg,var(--brand),#5fd1c8);display:grid;place-items:center;color:#fff;box-shadow:var(--shadow);font-weight:900}
.tagline{color:var(--muted);font-size:14px;margin-top:2px}
.main-nav{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.main-nav .wrap{display:flex;gap:8px;align-items:center;overflow-x:auto}
.main-nav a{padding:14px 12px;font-weight:700;color:#24314a;white-space:nowrap;border-bottom:3px solid transparent}
.main-nav a:hover,.main-nav a.active{color:var(--brand);border-bottom-color:var(--brand)}
.search-band{background:linear-gradient(180deg,#f8fbff,#fff);border-bottom:1px solid var(--line);padding:18px 0}
.search-box{display:flex;gap:10px;align-items:center}
.search-box input{flex:1;border:1px solid var(--line);border-radius:14px;padding:13px 16px;font-size:16px;outline:none;background:#fff}
.search-box button,.btn{border:0;border-radius:14px;background:var(--brand);color:#fff;padding:13px 18px;font-weight:800;cursor:pointer;box-shadow:0 8px 18px rgba(37,87,214,.20)}
.search-tip{margin-top:8px;color:var(--muted);font-size:14px;min-height:22px}
.hero{padding:34px 0 18px}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:24px;align-items:stretch}
.hero-card{background:var(--card);border:1px solid var(--line);border-radius:26px;overflow:hidden;box-shadow:var(--shadow)}
.hero-body{padding:24px}
.kicker{display:inline-flex;align-items:center;gap:6px;background:#eef4ff;color:var(--brand);border-radius:999px;padding:4px 10px;font-size:13px;font-weight:800;margin-bottom:10px}
h1,h2,h3{line-height:1.25;margin:0 0 12px}
h1{font-size:clamp(30px,5vw,50px)}h2{font-size:28px}h3{font-size:20px}
p{margin:0 0 12px;color:#344159}.muted{color:var(--muted)}
.meta{display:flex;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:14px;margin:12px 0}
.meta span{background:var(--soft);border-radius:999px;padding:3px 9px}
.stat-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}.stat{border:1px solid var(--line);border-radius:16px;padding:10px 12px;background:#fff}.stat b{font-size:22px;color:var(--brand)}
.side-panel{display:grid;gap:14px}.notice{border:1px solid var(--line);border-radius:22px;padding:18px;background:#fff;box-shadow:var(--shadow)}
.section{padding:26px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}.section-head a{color:var(--brand);font-weight:800}
.grid{display:grid;gap:18px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);border-radius:22px;background:#fff;overflow:hidden;box-shadow:0 10px 24px rgba(22,42,90,.07)}
.card-body{padding:18px}.card h3 a:hover{color:var(--brand)}
.video-card{position:relative;overflow:hidden;background:#101828}.video-card video,.video-card img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .35s ease,filter .35s ease}.video-card:hover img,.video-card:hover video{transform:scale(1.035);filter:brightness(.78)}
.play-overlay{position:absolute;inset:0;display:grid;place-items:center;opacity:0;transition:opacity .2s ease;background:linear-gradient(180deg,rgba(0,0,0,.1),rgba(0,0,0,.38))}.video-card:hover .play-overlay{opacity:1}.play-button{width:68px;height:68px;border-radius:999px;background:rgba(255,255,255,.94);display:grid;place-items:center;color:var(--brand);font-weight:900;font-size:24px;box-shadow:0 8px 20px rgba(0,0,0,.2)}
.video-label{position:absolute;left:12px;top:12px;background:rgba(37,87,214,.92);color:#fff;border-radius:999px;padding:4px 9px;font-size:13px;font-weight:800}.image-description{font-size:13px;color:var(--muted);padding:8px 12px;background:#f8fafc}
.tag-list{display:flex;gap:8px;flex-wrap:wrap}.tag{display:inline-flex;border:1px solid var(--line);background:#fff;border-radius:999px;color:#40506b;padding:5px 10px;font-size:13px}.tag.hot{background:#fff6e6;border-color:#ffe0a3;color:#8a5600}
.list{display:grid;gap:12px}.list-item{display:grid;grid-template-columns:auto 1fr;gap:12px;padding:13px;border:1px solid var(--line);border-radius:16px;background:#fff}.rank{width:32px;height:32px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:900}
.author{display:flex;gap:12px;align-items:center}.avatar{width:52px;height:52px;border-radius:18px;background:linear-gradient(135deg,#dbe7ff,#fff4da);display:grid;place-items:center;color:var(--brand);font-weight:900}
.faq details{border:1px solid var(--line);border-radius:18px;padding:14px 16px;background:#fff}.faq details+details{margin-top:10px}.faq summary{font-weight:800;cursor:pointer;color:#20304a}
.comment{border:1px solid var(--line);border-radius:20px;padding:16px;background:#fff}.stars{color:#d98b00;letter-spacing:2px}
.breadcrumb{font-size:14px;color:var(--muted);margin:18px 0}.breadcrumb a{color:var(--brand)}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:26px}.article-main{border:1px solid var(--line);border-radius:24px;background:#fff;padding:24px;box-shadow:var(--shadow)}.article-main h1{font-size:38px}.article-main h2{margin-top:24px}.article-main ul{padding-left:20px;color:#344159}.sidebar{display:grid;gap:16px;align-self:start;position:sticky;top:74px}.box{border:1px solid var(--line);border-radius:22px;padding:18px;background:#fff;box-shadow:0 8px 20px rgba(20,40,80,.06)}
.cta{background:linear-gradient(135deg,#1f4ed4,#20b99a);color:#fff;border-radius:26px;padding:28px;display:flex;justify-content:space-between;gap:20px;align-items:center;flex-wrap:wrap}.cta p{color:#edf6ff}.cta .btn{background:#fff;color:var(--brand);box-shadow:none}
.site-footer{margin-top:36px;background:#111827;color:#d1d5db}.footer-inner{padding:34px 0;display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:24px}.site-footer a{color:#e5e7eb}.foot-title{font-weight:900;color:#fff;margin-bottom:10px}.copyright{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;color:#aeb6c3;font-size:14px}
.share a{display:inline-flex;margin:4px 6px 4px 0;border:1px solid var(--line);padding:8px 10px;border-radius:12px;color:var(--brand);font-weight:800;background:#fff}.table{width:100%;border-collapse:collapse;background:#fff;border-radius:18px;overflow:hidden}.table th,.table td{border-bottom:1px solid var(--line);padding:12px;text-align:left}.table th{background:#f4f7fd;color:#22314d}
@media (max-width:920px){.hero-grid,.article-layout,.footer-inner{grid-template-columns:1fr}.grid-3,.grid-4,.grid-2{grid-template-columns:1fr 1fr}.sidebar{position:static}.article-main h1{font-size:30px}}
@media (max-width:620px){.wrap{width:min(100% - 22px,1180px)}.grid-3,.grid-4,.grid-2{grid-template-columns:1fr}.logo-row{align-items:flex-start;flex-direction:column}.search-box{flex-direction:column;align-items:stretch}.hero-body{padding:18px}.section-head{align-items:flex-start;flex-direction:column}.stat-row{display:grid;grid-template-columns:1fr 1fr}.main-nav a{padding:12px 9px}.article-main{padding:18px}}