/* 91浏览器 - 内容型官网样式 */
:root{
    --primary:#6F5AE8;
    --primary-soft:#9A8CF2;
    --dark:#242433;
    --bg:#F8F8FC;
    --bg-alt:#F0EEFA;
    --text:#30303A;
    --muted:#70707D;
    --accent:#F29A4A;
    --line:#DEDCEB;
    --white:#FFFFFF;
    --shadow:0 18px 50px rgba(36,36,51,.09);
    --radius:24px;
    --radius-sm:14px;
    --container:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:var(--primary);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:#5944D6}
button,input{font:inherit}
button{cursor:pointer}
code{font-family:Consolas,"SFMono-Regular",monospace;background:#ECE9F8;padding:.12em .38em;border-radius:5px;font-size:.92em}
.container{width:min(calc(100% - 40px),var(--container));margin-inline:auto}
.content-narrow{width:min(calc(100% - 40px),820px);margin-inline:auto}
.skip-link{position:fixed;left:16px;top:-80px;background:var(--dark);color:#fff;padding:10px 16px;z-index:9999;border-radius:8px}.skip-link:focus{top:16px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(248,248,252,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(222,220,235,.8)}
.header-inner{min-height:78px;display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;align-items:center;gap:11px;color:var(--dark);font-weight:800;font-size:20px;text-decoration:none;white-space:nowrap}.brand img{width:42px;height:42px;object-fit:contain;border-radius:12px}.brand:hover{color:var(--dark)}
.site-nav{display:flex;align-items:center;gap:4px;margin-left:auto}.site-nav a{color:var(--text);text-decoration:none;padding:9px 11px;border-radius:10px;font-size:15px}.site-nav a:hover,.site-nav a[aria-current="page"]{background:var(--bg-alt);color:var(--primary)}
.menu-toggle{display:none;background:transparent;border:1px solid var(--line);border-radius:10px;padding:8px 12px;color:var(--text)}
.search-open{border:1px solid var(--line);background:var(--white);color:var(--text);padding:9px 14px;border-radius:12px;white-space:nowrap}.search-open:hover{border-color:var(--primary);color:var(--primary)}
.search-modal[hidden]{display:none !important}
.search-modal{position:fixed;inset:0;z-index:100;display:grid;place-items:start center;padding:11vh 20px 20px}.search-backdrop{position:absolute;inset:0;background:rgba(20,19,31,.55)}
.search-panel{position:relative;width:min(720px,100%);background:var(--white);border-radius:24px;padding:26px;box-shadow:0 30px 90px rgba(20,19,31,.28)}
.search-panel-head{display:flex;justify-content:space-between;align-items:center;gap:20px}.search-panel-head h2{margin:0;font-size:26px}.icon-button{border:0;background:var(--bg-alt);width:40px;height:40px;border-radius:50%;font-size:26px;line-height:1}
.search-form label{display:block;font-weight:700;margin-bottom:8px}.search-row{display:flex;gap:10px}.search-row input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff;color:var(--text);outline:none}.search-row input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(111,90,232,.12)}.microcopy{margin:12px 0 0;color:var(--muted);font-size:14px}
.hero{padding:76px 0 64px}.hero-grid,.two-column{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:64px;align-items:center}.hero-copy h1,.page-hero h1,.article-header h1{font-size:clamp(38px,5vw,64px);line-height:1.08;letter-spacing:-.035em;margin:15px 0 22px;color:var(--dark)}
.hero-copy p,.lead{font-size:18px;color:#535360;line-height:1.85}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:11px 18px;border-radius:13px;border:1px solid transparent;font-weight:750;text-decoration:none}.button.primary{background:var(--primary);color:#fff}.button.primary:hover{background:#5D49D9;color:#fff}.button.secondary{background:#fff;color:var(--primary);border-color:var(--line)}.button.secondary:hover{border-color:var(--primary)}.button.light{background:#fff;color:var(--dark)}
.eyebrow{display:inline-block;color:var(--primary);font-size:13px;font-weight:800;letter-spacing:.11em;text-transform:uppercase}.section-dark .eyebrow{color:#C7BEFF}
.hero-notes{display:flex;flex-wrap:wrap;gap:8px 18px;padding:0;margin:24px 0 0;list-style:none;color:var(--muted);font-size:14px}.hero-notes li::before{content:"✓";color:var(--primary);font-weight:800;margin-right:7px}
.hero-media{margin:0;background:var(--bg-alt);padding:18px;border-radius:30px;box-shadow:var(--shadow);transform:rotate(1deg)}.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:20px}.hero-media figcaption{color:var(--muted);font-size:13px;padding:10px 4px 0}
.section{padding:78px 0}.section-muted{background:var(--bg-alt)}.section-dark{background:var(--dark);color:#EDECF4}.section-dark h2,.section-dark h3{color:#fff}
.section-heading{max-width:780px;margin-bottom:34px}.section-heading h2,.editorial-block h2,.topic-focus h2,.split-heading h2,.content-narrow>h2{font-size:clamp(30px,4vw,46px);line-height:1.18;letter-spacing:-.02em;margin:10px 0 16px;color:var(--dark)}.section-heading p,.split-heading p{color:var(--muted);font-size:17px}.split-heading{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:end;max-width:none}.light-text p{color:#C9C8D4}.light-text h2{color:#fff}
.core-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.core-card{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden}.core-card img{width:100%;aspect-ratio:16/10;object-fit:cover;background:var(--bg-alt)}.core-card-body{padding:22px}.core-card h3{font-size:22px;line-height:1.35;margin:0 0 10px}.core-card p{color:var(--muted);margin:0 0 14px}.text-link{font-weight:750;text-decoration:none}.text-link::after{content:" →"}
.editorial-image{margin:0;border-radius:24px;overflow:hidden;background:#E7E3F5}.editorial-image img{width:100%;aspect-ratio:4/3;object-fit:cover}.wide-shadow{box-shadow:var(--shadow)}.editorial-block p,.topic-focus p{color:var(--muted);font-size:17px}.lead{margin-top:0}.compare-lines{display:grid;gap:13px;margin:24px 0}.compare-lines div{display:grid;grid-template-columns:150px 1fr;gap:12px;padding:14px 0;border-top:1px solid var(--line)}.compare-lines span{color:var(--muted)}
.step-list{list-style:none;padding:0;margin:0;display:grid;gap:14px}.step-list li{display:grid;grid-template-columns:58px 1fr;gap:20px;align-items:start;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.step-number{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--bg-alt);color:var(--primary);font-weight:850}.step-list h3{margin:1px 0 5px}.step-list p{margin:0;color:var(--muted)}
.feature-band{display:grid;grid-template-columns:.85fr 1.15fr;gap:60px}.feature-band-intro h2{font-size:42px;line-height:1.2;margin:10px 0 16px}.feature-band-intro p{color:#C9C8D4}.feature-band-list{display:grid;gap:12px}.feature-band-list article{padding:20px 22px;border:1px solid rgba(255,255,255,.12);border-radius:18px;background:rgba(255,255,255,.04)}.feature-band-list h3{margin:0 0 6px}.feature-band-list p{margin:0;color:#C9C8D4}
.check-list{list-style:none;padding:0;margin:22px 0;display:grid;gap:10px}.check-list li{position:relative;padding-left:28px}.check-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--primary);font-weight:850}.section-dark .check-list li::before{color:#C7BEFF}
.article-list{display:grid}.article-row{display:grid;grid-template-columns:150px 1fr auto;gap:24px;align-items:start;padding:24px 0;border-top:1px solid var(--line)}.article-meta{display:flex;flex-direction:column;gap:4px;color:var(--muted);font-size:13px}.article-meta span{color:var(--primary);font-weight:800}.article-row h3{margin:0 0 5px;font-size:21px}.article-row h3 a{color:var(--dark);text-decoration:none}.article-row p{margin:0;color:var(--muted)}
.help-grid,.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.help-grid a,.related-grid a{display:flex;flex-direction:column;gap:5px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:16px;text-decoration:none}.help-grid strong,.related-grid strong{color:var(--dark);font-size:17px}.help-grid span,.related-grid span{color:var(--muted);font-size:14px}.help-grid a:hover,.related-grid a:hover{border-color:var(--primary);transform:translateY(-1px)}
.faq-stack{display:grid;gap:12px}.faq-stack details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:0 18px}.faq-stack summary{list-style:none;cursor:pointer;padding:17px 30px 17px 0;font-weight:750;position:relative}.faq-stack summary::-webkit-details-marker{display:none}.faq-stack summary::after{content:"+";position:absolute;right:2px;top:12px;font-size:24px;color:var(--primary)}.faq-stack details[open] summary::after{content:"–"}.faq-stack p{margin:0 0 17px;color:var(--muted)}
.trust-strip{display:grid;grid-template-columns:1.2fr 1fr;gap:26px 60px}.trust-strip p{color:var(--muted)}.trust-links{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:12px}.trust-links a,.inline-links a{display:inline-flex;padding:10px 14px;border:1px solid var(--line);background:#fff;border-radius:12px;text-decoration:none;font-weight:700}
.breadcrumbs{width:min(calc(100% - 40px),var(--container));margin:18px auto 0}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:7px;padding:0;margin:0;list-style:none;font-size:13px;color:var(--muted)}.breadcrumbs li:not(:last-child)::after{content:"/";margin-left:7px;color:#B8B6C7}.breadcrumbs a{color:var(--muted);text-decoration:none}.breadcrumbs a:hover{color:var(--primary)}
.page-hero{padding:58px 0 54px}.compact-hero{padding-top:52px}.page-hero h1{font-size:clamp(36px,4.7vw,58px)}.max-copy{max-width:760px}.download-hero{background:linear-gradient(180deg,#F8F8FC 0,#F3F1FB 100%)}
.numbered-prose{counter-reset:item;list-style:none;padding:0;margin:26px 0;display:grid;gap:15px}.numbered-prose li{position:relative;padding:22px 22px 22px 72px;background:#fff;border:1px solid var(--line);border-radius:18px}.numbered-prose li::before{counter-increment:item;content:counter(item);position:absolute;left:20px;top:20px;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--bg-alt);color:var(--primary);font-weight:850}.notice{padding:18px 20px;border-radius:16px}.notice.neutral{background:#F4F2FB;border:1px solid #DDD8F7;color:#4D4C59}
.three-column{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.info-columns article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px}.section-muted .info-columns article{background:rgba(255,255,255,.7)}.info-columns h2{font-size:22px;margin:0 0 10px}.info-columns p{color:var(--muted)}.info-columns a{font-weight:700;text-decoration:none}
.text-button{border:0;background:transparent;color:var(--primary);font-weight:800;padding:0;text-decoration:underline;text-underline-offset:4px}
.four-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.checklist-cards article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.checklist-cards span{color:var(--accent);font-weight:900;font-size:13px;letter-spacing:.08em}.checklist-cards h3{margin:7px 0 8px}.checklist-cards p{margin:0;color:var(--muted);font-size:15px}
.timeline{display:grid;gap:0;margin-top:24px}.timeline article{display:grid;grid-template-columns:54px 1fr;gap:18px;position:relative;padding-bottom:28px}.timeline article:not(:last-child)::before{content:"";position:absolute;left:20px;top:42px;bottom:0;width:2px;background:var(--line)}.timeline article>span{width:42px;height:42px;display:grid;place-items:center;background:var(--primary);color:#fff;border-radius:50%;font-weight:800;z-index:1}.timeline h3{margin:2px 0 5px}.timeline p{margin:0;color:var(--muted)}
.feature-detail-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.feature-detail{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px}.feature-detail h2{margin:0 0 8px;font-size:26px}.lead-small{color:var(--muted);margin:0 0 18px}.feature-detail ul{padding-left:20px;margin:0;display:grid;gap:10px}.feature-detail li::marker{color:var(--primary)}
.prose-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;font-size:17px}.prose-card p{margin:0 0 16px}.prose-card p:last-child{margin-bottom:0}
.guide-index{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.guide-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px}.guide-card-top{display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:13px}.guide-card-top span{color:var(--primary);font-weight:800}.guide-card h2{font-size:23px;line-height:1.35;margin:12px 0 10px}.guide-card h2 a{color:var(--dark);text-decoration:none}.guide-card p{color:var(--muted)}
.topic-stack{display:grid;gap:54px}.topic-row{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:center}.topic-row.reverse{grid-template-columns:.9fr 1.1fr}.topic-row.reverse figure{order:2}.topic-row figure{margin:0;border-radius:24px;overflow:hidden}.topic-row figure img{width:100%;aspect-ratio:16/10;object-fit:cover}.topic-row h2{font-size:38px;line-height:1.2;margin:8px 0 12px}.topic-row p{color:var(--muted);font-size:17px}
.compat-list{display:grid;gap:10px}.compat-list article{padding:16px 18px;border-left:3px solid var(--primary);background:#fff;border-radius:0 14px 14px 0}.compat-list h3{margin:0 0 4px}.compat-list p{margin:0;color:var(--muted)}
.prose-flow h2{font-size:28px;margin:34px 0 10px}.prose-flow h2:first-child{margin-top:0}.prose-flow p{color:var(--muted);font-size:17px}.inline-links{display:flex;flex-wrap:wrap;gap:10px}
.inline-search{max-width:680px;margin-top:26px}.search-page-hero{background:var(--bg-alt)}.search-results{display:grid;gap:16px}.result-count{color:var(--muted);font-size:14px}.search-results article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.search-results article>span{color:var(--primary);font-weight:800;font-size:13px}.search-results h2{font-size:23px;margin:5px 0 7px}.search-results h2 a{color:var(--dark);text-decoration:none}.search-results p{color:var(--muted)}.empty-state{background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px}.empty-state h2{margin-top:0}
.article-page{padding:54px 0 0}.article-header{padding-bottom:30px}.article-header h1{font-size:clamp(38px,5vw,60px)}.article-body{font-size:18px;line-height:1.9}.article-cover{margin:0 0 34px;border-radius:24px;overflow:hidden}.article-cover img{width:100%;aspect-ratio:16/9;object-fit:cover}.article-body h2{font-size:30px;line-height:1.25;margin:40px 0 14px;color:var(--dark)}.article-body p{margin:0 0 24px}.article-note{margin:34px 0 0;padding:20px;border-radius:16px;background:var(--bg-alt);border:1px solid var(--line);font-size:16px}
.error-page{text-align:center;padding-top:90px;padding-bottom:110px}.error-code{font-size:86px;line-height:1;font-weight:900;color:var(--primary)}.error-page h1{font-size:44px;margin:15px 0}.error-page .hero-actions{justify-content:center}.error-page .related-grid{text-align:left;margin-top:46px}
.site-footer{background:#1F1F2C;color:#C9C8D4;padding:58px 0 22px}.footer-grid{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:38px}.footer-brand{color:#fff;font-size:22px;font-weight:850}.footer-about p{max-width:360px}.site-footer h2{color:#fff;font-size:16px;margin:0 0 12px}.site-footer ul{padding:0;margin:0;list-style:none;display:grid;gap:8px}.site-footer a{color:#C9C8D4;text-decoration:none}.site-footer a:hover{color:#fff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.1);margin-top:38px;padding-top:20px;font-size:13px;color:#9997A7}
.back-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border:0;border-radius:50%;background:var(--primary);color:#fff;box-shadow:var(--shadow);z-index:40;font-size:20px}
@media (max-width:1100px){.site-nav{gap:0}.site-nav a{padding:8px 7px;font-size:14px}.header-inner{gap:14px}.core-grid,.feature-detail-grid{grid-template-columns:repeat(2,1fr)}.four-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:900px){.menu-toggle{display:inline-flex;margin-left:auto}.site-nav{position:absolute;top:78px;left:20px;right:20px;display:none;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow)}.site-nav.is-open{display:flex}.site-nav a{padding:11px 13px}.search-open{padding:8px 11px}.hero-grid,.two-column,.feature-band,.split-heading,.topic-row,.topic-row.reverse,.trust-strip{grid-template-columns:1fr;gap:34px}.topic-row.reverse figure{order:0}.hero{padding-top:48px}.hero-media{transform:none}.feature-band-intro h2{font-size:36px}.three-column{grid-template-columns:1fr}.article-row{grid-template-columns:120px 1fr}.article-row>.text-link{grid-column:2}.footer-grid{grid-template-columns:repeat(2,1fr)}.footer-about{grid-column:1/-1}.trust-links{grid-column:auto}.compare-lines div{grid-template-columns:1fr;gap:4px}}
@media (max-width:680px){.container,.content-narrow,.breadcrumbs{width:min(calc(100% - 28px),var(--container))}.header-inner{min-height:68px}.brand span{font-size:18px}.brand img{width:36px;height:36px}.site-nav{top:68px;left:14px;right:14px}.search-open{font-size:0;width:42px;height:38px;position:relative}.search-open::after{content:"搜索";font-size:13px;position:absolute;inset:0;display:grid;place-items:center}.hero,.section{padding:54px 0}.hero-copy h1,.page-hero h1,.article-header h1{font-size:36px}.hero-copy p,.lead{font-size:16px}.hero-actions{flex-direction:column}.button{width:100%}.core-grid,.feature-detail-grid,.guide-index,.help-grid,.related-grid,.four-grid{grid-template-columns:1fr}.section-heading h2,.editorial-block h2,.topic-focus h2,.split-heading h2,.content-narrow>h2{font-size:31px}.core-card-body{padding:18px}.step-list li{grid-template-columns:44px 1fr;padding:18px;gap:12px}.step-number{width:38px;height:38px}.article-row{grid-template-columns:1fr;gap:8px}.article-row>.text-link{grid-column:1}.article-meta{flex-direction:row}.footer-grid{grid-template-columns:1fr}.footer-about{grid-column:auto}.footer-bottom{flex-direction:column}.search-modal{padding:7vh 14px 14px}.search-panel{padding:20px;border-radius:20px}.search-row{flex-direction:column}.search-row .button{width:100%}.topic-row h2{font-size:31px}.error-page h1{font-size:34px}.error-code{font-size:72px}.article-body{font-size:17px}.article-body h2{font-size:27px}.reverse-mobile figure{order:0}.reverse-mobile>div{order:1}}
@media (max-width:420px){.brand span{display:none}.search-open{margin-left:0}.header-inner{gap:8px}.hero-copy h1,.page-hero h1,.article-header h1{font-size:32px}.section{padding:46px 0}.section-heading h2,.editorial-block h2,.topic-focus h2,.split-heading h2,.content-narrow>h2{font-size:28px}.feature-band-intro h2{font-size:30px}.checklist-cards article,.guide-card{padding:19px}}