/* 91网内容站：深紫品牌体系，文字索引优先，图片辅助 */
:root{
  --brand:#6D28D9;--brand-soft:#A78BFA;--ink:#27242D;--muted:#716B78;--dark:#17151C;--bg:#F7F5FA;--soft:#ECE8F2;--accent:#F59E0B;--white:#fff;
  --line:#d9d3e2;--shadow:0 16px 50px rgba(31,22,44,.10);--radius:18px;--radius-sm:12px;--shell:min(1180px,calc(100% - 40px));--narrow:min(850px,calc(100% - 40px));
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;line-height:1.72}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.shell{width:var(--shell);margin-inline:auto}.narrow-copy{width:var(--narrow);margin-inline:auto}.wide-shell{width:min(1260px,calc(100% - 40px));margin-inline:auto}.skip-link{position:fixed;left:12px;top:12px;z-index:1000;background:#fff;color:#000;padding:10px 14px;border-radius:8px;transform:translateY(-160%)}.skip-link:focus{transform:none}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,245,250,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(109,40,217,.10)}.header-inner{min-height:78px;display:flex;align-items:center;gap:24px}.brand-lockup{display:flex;align-items:center;gap:12px;margin-right:auto}.brand-lockup img{width:46px;height:46px;object-fit:cover;border-radius:14px;background:var(--soft)}.brand-lockup span{display:grid}.brand-lockup strong{font-size:1.12rem;color:var(--dark)}.brand-lockup small{font-size:.78rem;color:var(--muted)}.site-nav{display:flex;align-items:center;gap:6px}.site-nav a{padding:9px 12px;border-radius:999px;color:#4a4352;font-size:.94rem}.site-nav a:hover,.site-nav a[aria-current="page"]{background:var(--soft);color:var(--brand)}.menu-toggle{display:none;border:0;background:var(--soft);padding:10px 14px;border-radius:10px;color:var(--dark)}.search-trigger{border:1px solid var(--line);background:#fff;color:var(--dark);padding:10px 14px;border-radius:999px}.search-trigger:hover{border-color:var(--brand);color:var(--brand)}.section{padding:76px 0}.compact-section{padding:58px 0}.soft-section{background:var(--soft)}.section-dark{background:var(--dark);color:#fff}.home-intro{padding:72px 0 62px}.home-intro-grid{display:grid;grid-template-columns:minmax(0,1.13fr) minmax(320px,.87fr);gap:52px;align-items:center}.intro-copy h1,.page-hero h1,.article-header h1{font-size:clamp(2.2rem,5vw,4.7rem);line-height:1.06;letter-spacing:-.045em;margin:.35em 0 .35em}.page-hero h1,.article-header h1{font-size:clamp(2.1rem,4vw,3.7rem)}.lede{font-size:clamp(1.05rem,1.9vw,1.25rem);color:var(--muted);max-width:72ch}.section-dark .lede{color:#d7d1de}.eyebrow{margin:0 0 8px;text-transform:none;letter-spacing:.08em;font-size:.78rem;font-weight:700;color:var(--brand)}.section-dark .eyebrow{color:var(--brand-soft)}.inline-actions{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:12px;font-weight:700;border:1px solid transparent}.btn.primary{background:var(--brand);color:#fff}.btn.primary:hover{background:#5b21b6}.btn.ghost{border-color:#504a58;color:#fff}.btn.ghost:hover{border-color:var(--brand-soft);color:var(--brand-soft)}.fact-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:34px 0 0}.fact-strip div{padding:14px 0;border-top:1px solid #39343f}.fact-strip dt{font-size:.78rem;color:#aaa0b2}.fact-strip dd{margin:4px 0 0;font-weight:700;font-size:.95rem}.intro-visual img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:28px;box-shadow:0 30px 80px rgba(0,0,0,.28)}figure{margin:0}.intro-visual figcaption,.feature-image figcaption{font-size:.84rem;color:#aaa0b2;margin-top:12px}.topic-index{display:grid;gap:0;margin-top:34px;border-top:1px solid var(--line)}.topic-index a{display:grid;grid-template-columns:220px 1fr;gap:24px;padding:20px 0;border-bottom:1px solid var(--line)}.topic-index a strong{color:var(--dark)}.topic-index a span{color:var(--muted)}.topic-index a:hover strong{color:var(--brand)}.section-head{max-width:820px;margin-bottom:30px}.split-head{display:flex;max-width:none;justify-content:space-between;gap:40px;align-items:end}.split-head>p{max-width:520px;color:var(--muted);margin:0}.section-head h2,.narrow-copy h2,.editorial-columns h2,.dimension-grid h2,.closing-map h2{font-size:clamp(1.6rem,3vw,2.5rem);line-height:1.18;letter-spacing:-.028em;margin:.25em 0 .5em}.section-head>p:not(.eyebrow),.narrow-copy>p:not(.eyebrow),.editorial-columns p,.dimension-grid p{color:var(--muted)}.video-hub{background:#fff}.video-layout{display:grid;grid-template-columns:minmax(300px,.74fr) minmax(0,1.26fr);gap:40px;align-items:start}.feature-image{position:sticky;top:110px}.feature-image img{width:100%;aspect-ratio:5/6;object-fit:cover;border-radius:22px}.home-story-list{display:grid;border-top:1px solid var(--line)}.story-row{padding:24px 0;border-bottom:1px solid var(--line)}.story-kicker{font-size:.75rem;color:var(--brand);font-weight:700;letter-spacing:.05em}.story-row h3{font-size:1.28rem;line-height:1.35;margin:6px 0 8px}.story-row h3 a:hover{color:var(--brand)}.story-row p{color:var(--muted);margin:0 0 10px}.text-link{display:inline-block;color:var(--brand);font-weight:700}.text-link:hover{text-decoration:underline;text-underline-offset:3px}.section-action{margin-top:28px}.editorial-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:0}.editorial-columns>div{padding:0 30px;border-left:1px solid #d7d0df}.editorial-columns>div:first-child{border-left:0;padding-left:0}.editorial-columns>div:last-child{padding-right:0}.editorial-list{display:grid;border-top:1px solid var(--line)}.two-column-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 34px}.two-column-list .story-row:nth-child(2n){border-left:1px solid var(--line);padding-left:34px}.dimension-band{background:var(--dark);color:#fff}.dimension-grid{display:grid;grid-template-columns:minmax(260px,.75fr) minmax(0,1.25fr);gap:48px;align-items:center}.dimension-grid figure img{aspect-ratio:16/10;width:100%;object-fit:cover;border-radius:18px}.dimension-grid p{color:#cfc7d5}.closing-map{padding-top:60px}.closing-links{display:grid;gap:10px;margin-top:24px}.closing-links a{padding:15px 18px;background:#fff;border:1px solid var(--line);border-radius:12px;color:#3b3541}.closing-links a:hover{border-color:var(--brand);color:var(--brand)}.page-hero{padding:62px 0 44px;background:linear-gradient(180deg,#f1edf7 0%,var(--bg) 100%)}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:7px;list-style:none;padding:0;margin:0 0 24px;font-size:.82rem;color:var(--muted)}.breadcrumbs li+li:before{content:"/";margin-right:7px;color:#aaa0b2}.breadcrumbs a:hover{color:var(--brand)}.inline-figure{margin-top:28px}.inline-figure 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1.5em}.article-body h2{font-size:1.8rem;line-height:1.25;margin:2.3em 0 .7em}.article-cover{margin:0 0 32px}.article-cover img{width:100%;aspect-ratio:16/8.6;object-fit:cover;border-radius:18px}.article-aside{position:sticky;top:108px}.aside-box{background:var(--soft);padding:20px;border-radius:16px}.aside-box h2{font-size:1rem;margin:0 0 10px}.aside-box a{display:block;padding:10px 0;border-top:1px solid #d7d0df;color:#4d4654}.aside-box a:hover{color:var(--brand)}.article-note{margin-top:32px;padding:18px 20px;border-left:4px solid var(--brand);background:#f0ebf6;border-radius:0 12px 12px 0}.related-section{background:#fff}.related-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 34px}.related-list .story-row:nth-child(2n){border-left:1px solid 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13px;border-radius:10px;box-shadow:var(--shadow)}.site-footer{background:var(--dark);color:#d7d1de;padding:58px 0 24px}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:42px}.footer-brand p{color:#aaa0b2;max-width:460px}.footer-logo{font-size:1.5rem;font-weight:800;color:#fff}.site-footer h2{font-size:.9rem;color:#fff;margin:0 0 12px}.site-footer a{display:block;padding:5px 0;color:#cfc7d5}.site-footer a:hover{color:#fff}.footer-bottom{border-top:1px solid #38323e;margin-top:38px;padding-top:20px;display:flex;justify-content:space-between;gap:18px;color:#93899b;font-size:.82rem}
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@media (max-width:760px){:root{--shell:min(100% - 26px,1180px);--narrow:min(100% - 26px,850px)}.header-inner{min-height:68px;gap:10px}.brand-lockup img{width:40px;height:40px}.brand-lockup small{display:none}.search-trigger{padding:9px 11px}.section{padding:56px 0}.home-intro{padding:52px 0}.home-intro-grid{gap:32px}.intro-copy h1,.page-hero h1,.article-header h1{font-size:clamp(2rem,11vw,3.2rem)}.fact-strip{grid-template-columns:1fr}.topic-index a{grid-template-columns:1fr;gap:5px}.split-head{display:block}.split-head>p{margin-top:14px}.feature-image{display:block}.feature-image figcaption{margin-bottom:20px}.two-column-list,.related-list{grid-template-columns:1fr}.two-column-list .story-row:nth-child(2n),.related-list .story-row:nth-child(2n){border-left:0;padding-left:0}.dimension-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:28px}.footer-grid>div:last-child{grid-column:auto}.footer-brand{grid-column:1/-1}.article-layout{padding-top:26px}.article-body{font-size:1rem}.search-panel{padding:28px 20px}.search-line,.search-page-form>div{flex-direction:column}.search-line button{min-height:45px}.footer-bottom{flex-direction:column}.inline-actions{align-items:stretch}.btn{width:100%}}
@media (max-width:480px){.header-inner{gap:8px}.brand-lockup strong{font-size:1rem}.menu-toggle,.search-trigger{font-size:.82rem}.footer-grid{grid-template-columns:1fr}.fact-strip{gap:6px}.home-intro{padding-top:38px}.article-cover img{aspect-ratio:4/3}.aside-box{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}