:root {
    --primary:#6F5AE8;
    --primary-soft:#9A8CF2;
    --dark:#242433;
    --bg:#F8F8FC;
    --surface:#FFFFFF;
    --surface-alt:#F0EEFA;
    --text:#30303A;
    --muted:#70707D;
    --accent:#F29A4A;
    --line:#E3E1EC;
    --shadow:0 18px 48px rgba(36,36,51,.09);
    --radius:24px;
    --radius-sm:14px;
    --shell:min(1180px, calc(100% - 40px));
}
*{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","Microsoft YaHei",Arial,sans-serif;line-height:1.72;-webkit-font-smoothing:antialiased}
body.modal-open{overflow:hidden}
a{color:inherit;text-decoration:none}
a:hover{color:var(--primary)}
img{max-width:100%;height:auto;display:block}
button,input{font:inherit}
button{cursor:pointer}
.shell{width:var(--shell);margin:0 auto}
.narrow-shell{max-width:920px}
.skip-link{position:fixed;left:16px;top:-70px;z-index:9999;background:var(--dark);color:#fff;padding:10px 14px;border-radius:10px}
.skip-link:focus{top:16px;color:#fff}
.site-header{position:sticky;top:0;z-index:100;background:rgba(248,248,252,.94);border-bottom:1px solid rgba(227,225,236,.8);backdrop-filter:blur(14px)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto}
.brand img{width:44px;height:44px;object-fit:contain;border-radius:10px}
.brand span{display:flex;flex-direction:column;line-height:1.2}
.brand strong{font-size:16px;color:var(--dark)}
.brand small{font-size:11px;color:var(--muted);margin-top:4px}
.primary-nav{display:flex;align-items:center;gap:6px}
.primary-nav a{font-size:14px;color:#4f4f5d;padding:10px 8px;border-radius:9px}
.primary-nav a:hover{background:var(--surface-alt);color:var(--primary)}
.menu-toggle{display:none;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:8px 12px;color:var(--dark)}
.search-trigger{border:0;background:var(--dark);color:#fff;border-radius:999px;padding:10px 16px;font-size:14px}
.search-trigger:hover{background:var(--primary)}
.search-modal[hidden]{display:none !important}
.search-modal{position:fixed;inset:0;z-index:1000;display:grid;place-items:start center;padding-top:11vh}
.search-backdrop{position:absolute;inset:0;background:rgba(22,22,32,.58)}
.search-panel{position:relative;width:min(640px,calc(100% - 28px));background:var(--surface);border-radius:24px;padding:26px;box-shadow:0 28px 80px rgba(20,20,30,.26)}
.search-head{display:flex;align-items:center;justify-content:space-between;gap:20px}
.search-head h2{margin:0;font-size:24px;color:var(--dark)}
.icon-button{border:1px solid var(--line);background:#fff;padding:8px 12px;border-radius:10px;color:var(--muted)}
.search-form{margin-top:22px}.search-form label,.search-inline label{display:block;font-weight:700;margin-bottom:8px}
.search-row,.search-inline>div{display:flex;gap:10px}
.search-row input,.search-inline input{flex:1;min-width:0;border:1px solid #cbc8d7;border-radius:12px;padding:13px 14px;background:#fff;color:var(--text);outline:none}
.search-row input:focus,.search-inline input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(111,90,232,.14)}
.search-row button,.search-inline button{border:0;background:var(--primary);color:#fff;border-radius:12px;padding:0 18px;font-weight:700}
.search-help{margin:12px 0 0;color:var(--muted);font-size:14px}
.hero{padding:68px 0 48px}.hero-grid{display:grid;grid-template-columns:1.03fr .97fr;align-items:center;gap:54px}
.eyebrow{margin:0 0 12px;color:var(--primary);font-weight:800;font-size:13px;letter-spacing:.08em;text-transform:uppercase}
.hero h1,.page-hero h1,.article-header h1,.search-page-head h1,.error-page h1{margin:0;color:var(--dark);font-size:clamp(38px,5.2vw,66px);line-height:1.08;letter-spacing:-.035em}
.hero .lead{font-size:18px;color:#5f5f6c;margin:24px 0 0;max-width:680px}
.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:10px 19px;border-radius:12px;font-weight:800;font-size:14px;transition:.18s ease}.button.primary{background:var(--primary);color:#fff}.button.primary:hover{background:#5c48d8;color:#fff;transform:translateY(-1px)}.button.secondary{background:#fff;border:1px solid var(--line);color:var(--dark)}.button.secondary:hover{border-color:var(--primary);color:var(--primary)}.button.light{background:#fff;color:var(--dark)}
.trust-list{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:8px;color:var(--muted);font-size:14px}.trust-list li{position:relative;padding-left:22px}.trust-list li:before{content:"";position:absolute;left:0;top:.68em;width:8px;height:8px;border-radius:50%;background:var(--accent)}
.hero-media{margin:0;background:linear-gradient(145deg,#ece9ff,#f8f7ff);padding:22px;border-radius:34px;box-shadow:var(--shadow);transform:rotate(1deg)}.hero-media img{width:100%;aspect-ratio:1.35/1;object-fit:cover;border-radius:24px;background:#eae7f7}.hero-media figcaption{padding:13px 4px 0;color:var(--muted);font-size:13px}
.section{padding:76px 0}.section-soft{background:var(--surface-alt)}.section-dark{background:var(--dark);color:#fff}.section-heading{margin-bottom:30px}.section-heading h2,.content-section>h2,.editorial-copy h2,.feature-band h2,.two-column h2,.final-cta h2{font-size:clamp(28px,3.3vw,42px);line-height:1.18;letter-spacing:-.025em;color:var(--dark);margin:0}.section-heading>p:not(.eyebrow){max-width:720px;color:var(--muted);margin:14px 0 0}.split-heading{display:flex;align-items:end;justify-content:space-between;gap:40px}.split-heading>p{max-width:470px!important}.intent-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.intent-card{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden}.intent-card img{width:100%;aspect-ratio:1.7/1;object-fit:cover;background:#e8e6f2}.intent-body{padding:22px}.intent-body h3{font-size:22px;margin:0 0 10px;color:var(--dark)}.intent-body p{margin:0 0 18px;color:var(--muted)}
.text-link{font-weight:800;color:var(--primary);display:inline-flex;align-items:center;gap:7px}.text-link:after{content:"→"}.text-link:hover{gap:10px}
.editorial-grid{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:64px}.editorial-copy p{color:#5f5f6c}.editorial-copy .button{margin-top:10px}.editorial-image{width:100%;border-radius:28px;aspect-ratio:1.35/1;object-fit:cover;box-shadow:var(--shadow);background:#e5e2f1}
.feature-band{display:grid;grid-template-columns:.78fr 1.22fr;gap:50px;background:#fff;border:1px solid var(--line);border-radius:30px;padding:28px;align-items:center}.feature-band>img{border-radius:22px;width:100%;height:100%;max-height:430px;object-fit:cover;background:#e6e3f0}.feature-band p{color:var(--muted)}
.check-list{padding:0;list-style:none;display:grid;gap:10px;margin:20px 0}.check-list li{position:relative;padding-left:27px}.check-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:900}
.light-heading h2,.light-heading .eyebrow{color:#fff}.light-heading .eyebrow{opacity:.7}.guide-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.12);border-radius:22px;overflow:hidden}.guide-strip article{padding:28px;background:var(--dark)}.guide-number{font-size:12px;color:#aaa6c6}.guide-strip h3{font-size:20px;line-height:1.3;margin:18px 0 12px}.guide-strip h3 a{color:#fff}.guide-strip p{font-size:14px;color:#c4c1d0;margin:0}
.article-list{border-top:1px solid var(--line)}.article-row{display:grid;grid-template-columns:150px 1fr auto;gap:26px;align-items:start;padding:24px 0;border-bottom:1px solid var(--line)}.article-meta{display:flex;flex-direction:column;gap:6px;font-size:12px;color:var(--muted)}.article-meta span{color:var(--primary);font-weight:800}.article-row h3{font-size:21px;margin:0 0 6px;color:var(--dark)}.article-row p{margin:0;color:var(--muted)}.row-link{font-weight:800;color:var(--primary);font-size:14px;padding-top:4px}
.two-column{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}.two-column p{color:var(--muted)}.info-panel{background:#fff;border-radius:24px;padding:26px;border:1px solid var(--line)}.info-panel h3{font-size:24px;margin:0 0 20px;color:var(--dark)}.number-list{list-style:none;padding:0;margin:0;display:grid;gap:18px;counter-reset:n}.number-list li{display:grid;grid-template-columns:120px 1fr;gap:15px;padding-bottom:16px;border-bottom:1px solid var(--line)}.number-list li:last-child{border-bottom:0;padding-bottom:0}.number-list strong{color:var(--dark)}.number-list span{color:var(--muted);font-size:14px}
.faq-preview{display:grid;gap:10px}.faq-preview details,.faq-page details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:0 18px}.faq-preview summary,.faq-page summary{cursor:pointer;font-weight:800;color:var(--dark);padding:18px 32px 18px 0;position:relative}.faq-preview summary:after,.faq-page summary:after{content:"+";position:absolute;right:0;color:var(--primary);font-size:20px}.faq-preview details[open] summary:after,.faq-page details[open] summary:after{content:"−"}.faq-preview p,.faq-page details div{color:var(--muted);margin:0;padding:0 0 18px}.final-cta{display:flex;align-items:center;justify-content:space-between;gap:50px}.final-cta>div:first-child{max-width:720px}.final-cta p{color:var(--muted)}.cta-links{display:flex;gap:10px;flex-wrap:wrap}
.site-footer{background:#1f1f2b;color:#c8c6d0;padding:60px 0 24px}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:60px}.footer-grid h2{color:#fff;font-size:17px;margin:0 0 16px}.footer-grid p{margin:0;max-width:520px}.footer-grid ul{list-style:none;padding:0;margin:0;display:grid;gap:9px}.footer-grid a{color:#c8c6d0}.footer-grid a:hover{color:#fff}.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:30px;border-top:1px solid rgba(255,255,255,.1);margin-top:42px;padding-top:22px;font-size:13px}.back-top{border:1px solid rgba(255,255,255,.18);background:transparent;color:#fff;border-radius:10px;padding:8px 12px}
.page-shell{padding:24px 0 80px}.breadcrumbs{font-size:13px;color:var(--muted);margin:8px 0 24px}.breadcrumbs ol{display:flex;flex-wrap:wrap;list-style:none;padding:0;margin:0;gap:8px}.breadcrumbs li:not(:last-child):after{content:"/";margin-left:8px;color:#aaa8b5}.page-hero{display:grid;grid-template-columns:1.08fr .92fr;gap:50px;align-items:center;padding:34px 0 54px;border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(36px,4.4vw,56px)}.page-hero p:not(.eyebrow){font-size:17px;color:var(--muted);max-width:720px}.page-hero img{width:100%;aspect-ratio:1.52/1;object-fit:cover;border-radius:26px;background:#e7e4f1}.download-hero .button{margin-top:14px}.vertical-hero{display:flex;flex-direction:column;align-items:flex-start}.vertical-hero img{aspect-ratio:1.8/1;max-height:470px}.content-section{padding:54px 0;border-bottom:1px solid var(--line)}.content-section:last-child{border-bottom:0}.content-section>p{color:var(--muted);max-width:880px}.definition-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:24px}.definition-grid article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.definition-grid h3{margin:0 0 8px;color:var(--dark)}.definition-grid p{margin:0;color:var(--muted)}.split-content{display:grid;grid-template-columns:1.35fr .65fr;gap:50px;align-items:start}.step-list{list-style:none;padding:0;margin:28px 0 0;display:grid;gap:18px}.step-list li{display:grid;grid-template-columns:50px 1fr;gap:18px}.step-list>li>span{width:44px;height:44px;border-radius:50%;background:var(--surface-alt);display:grid;place-items:center;color:var(--primary);font-size:12px;font-weight:800}.step-list h3{margin:0 0 6px;color:var(--dark)}.step-list p{margin:0;color:var(--muted)}.note-card{background:#fff;border:1px solid var(--line);padding:24px;border-radius:20px;position:sticky;top:98px}.note-card h3{margin:0 0 10px;font-size:22px;color:var(--dark)}.note-card p{color:var(--muted)}.accent-note{border-top:4px solid var(--accent)}.inset-section{border-radius:24px;padding-left:28px;padding-right:28px;margin-top:18px;border-bottom:0}.troubleshoot-table{margin-top:24px;border:1px solid #d9d6e4;border-radius:14px;overflow:hidden}.table-row{display:grid;grid-template-columns:.8fr 1fr 1.2fr;background:#fff;border-bottom:1px solid var(--line)}.table-row:last-child{border-bottom:0}.table-row span{padding:14px}.table-row.head{background:var(--dark);color:#fff;font-weight:800}.section-footnote{margin-top:16px!important}.related-section .mini-grid{margin-top:22px}.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.mini-grid article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.mini-grid span{font-size:12px;color:var(--primary);font-weight:800}.mini-grid h3{margin:8px 0;font-size:19px}.mini-grid p{margin:0;color:var(--muted);font-size:14px}.download-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.download-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px}.download-card h3{margin:0;font-size:22px}.download-card p{color:var(--muted);min-height:88px}.status-pill{display:inline-flex;border-radius:999px;padding:8px 12px;font-size:12px;font-weight:800}.status-pill.muted{background:#eceaf2;color:#6f6d78}.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:26px 0}.timeline article{position:relative;background:#fff;border-radius:18px;padding:22px;border:1px solid var(--line)}.timeline span{color:var(--accent);font-size:12px;font-weight:900}.timeline h3{font-size:18px;line-height:1.35}.timeline p{font-size:14px;color:var(--muted);margin-bottom:0}.guide-catalog{display:grid;gap:22px}.catalog-item{display:grid;grid-template-columns:80px 1fr auto;gap:26px;align-items:start;background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px}.catalog-index{font-size:34px;font-weight:900;color:#d2cdec}.catalog-item h2{margin:0;font-size:25px;color:var(--dark)}.catalog-item p{color:var(--muted)}.catalog-item ul{display:flex;flex-wrap:wrap;gap:8px 20px;padding:0;list-style:none;margin:14px 0 0}.catalog-item li{font-size:13px;color:#5f5f6d}.catalog-item li:before{content:"•";color:var(--accent);margin-right:7px}.prose-sections{display:grid;gap:0}.prose-sections article{display:grid;grid-template-columns:70px 1fr;gap:26px;padding:30px 0;border-bottom:1px solid var(--line)}.prose-sections article:last-child{border-bottom:0}.section-index{font-size:13px;font-weight:900;color:var(--primary)}.prose-sections h2{margin:0 0 8px!important;font-size:28px!important}.prose-sections p{margin:0;color:var(--muted);max-width:820px}.link-stack{display:grid;gap:10px}.link-stack>a{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff;border:1px solid var(--line);padding:16px 18px;border-radius:14px;font-weight:800;color:var(--dark)}.link-stack>a span{font-size:12px;color:var(--muted);font-weight:500}.faq-page{display:grid;gap:12px}.faq-page>h2{margin-bottom:10px}.safety-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.safety-grid article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.safety-grid span{font-size:12px;color:var(--primary);font-weight:900}.safety-grid h2{font-size:22px!important;margin-top:12px!important}.safety-grid p{color:var(--muted);margin-bottom:0}.prose{font-size:17px}.prose h2{margin-top:38px!important;font-size:30px!important}.prose p{max-width:none}.prose code{font-size:.9em;background:var(--surface-alt);padding:2px 5px;border-radius:5px}.article-shell{max-width:980px}.article-header{padding:36px 0}.article-kicker{display:flex;gap:14px;color:var(--muted);font-size:13px}.article-kicker span{color:var(--primary);font-weight:800}.article-header h1{font-size:clamp(38px,5vw,60px);margin-top:16px}.article-header>p{font-size:18px;color:var(--muted);max-width:820px}.article-header>img{width:100%;max-height:520px;object-fit:cover;border-radius:26px;margin-top:30px;background:#e8e5f0}.article-content{max-width:760px;margin:0 auto;padding:10px 0 30px}.article-content section{padding:26px 0}.article-content h2{font-size:28px;line-height:1.25;color:var(--dark);margin:0 0 12px}.article-content p{font-size:17px;color:#4d4d59;margin:0}.article-footer{max-width:760px;margin:0 auto;background:var(--surface-alt);border-radius:18px;padding:22px}.article-footer p{margin-top:0;color:var(--muted)}.search-page{max-width:960px}.search-page-head{padding:30px 0}.search-page-head h1{font-size:48px}.search-page-head p{color:var(--muted)}.search-inline{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.search-results{display:grid}.result-count{color:var(--muted)}.search-results article{display:grid;grid-template-columns:72px 1fr auto;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}.search-results article>span{font-size:12px;color:var(--primary);font-weight:800}.search-results h2{font-size:21px!important;margin:0 0 6px!important}.search-results p{margin:0;color:var(--muted)}.empty-state{text-align:center;background:#fff;border:1px solid var(--line);border-radius:22px;padding:50px 28px}.empty-state h2{font-size:28px}.empty-state p{color:var(--muted)}.error-page{padding:100px 0 130px;text-align:center}.error-code{font-size:88px;line-height:1;margin:0;color:#d3ceec;font-weight:900}.error-page h1{font-size:44px}.error-page>p:not(.error-code){color:var(--muted)}.error-page .hero-actions{justify-content:center}.error-links{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px}.error-links a{background:#fff;border:1px solid var(--line);padding:16px;border-radius:14px;font-weight:700}
@media (max-width:1080px){.primary-nav{gap:2px}.primary-nav a{font-size:13px;padding:9px 6px}.hero-grid,.page-hero{gap:34px}.guide-strip{grid-template-columns:repeat(2,1fr)}.download-grid,.timeline{grid-template-columns:repeat(2,1fr)}.safety-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:920px){:root{--shell:min(100% - 30px, 760px)}.menu-toggle{display:block}.primary-nav{position:absolute;left:15px;right:15px;top:68px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:10px;display:none;flex-direction:column;align-items:stretch}.primary-nav.is-open{display:flex}.primary-nav a{padding:11px 12px}.search-trigger{padding:9px 13px}.hero-grid,.editorial-grid,.page-hero,.split-content,.two-column{grid-template-columns:1fr}.hero{padding-top:46px}.hero-media{max-width:690px}.intent-grid,.definition-grid,.mini-grid{grid-template-columns:1fr 1fr}.feature-band{grid-template-columns:1fr}.article-row{grid-template-columns:120px 1fr}.article-row .row-link{grid-column:2}.split-heading,.final-cta{align-items:flex-start;flex-direction:column;display:flex}.footer-grid{grid-template-columns:1.3fr 1fr}.footer-grid section:last-child{grid-column:1/-1}.catalog-item{grid-template-columns:60px 1fr}.catalog-item>.text-link{grid-column:2}.note-card{position:static}.error-links{grid-template-columns:1fr 1fr}}
@media (max-width:640px){:root{--shell:calc(100% - 24px)}.site-header{position:relative}.header-inner{min-height:68px;gap:9px}.brand small{display:none}.brand strong{font-size:14px}.brand img{width:38px;height:38px}.search-trigger{font-size:0;padding:9px 10px}.search-trigger:after{content:"搜索";font-size:13px}.hero{padding:38px 0 28px}.hero h1,.page-hero h1,.article-header h1{font-size:36px}.hero .lead{font-size:16px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions .button{width:100%}.section{padding:52px 0}.intent-grid,.definition-grid,.mini-grid,.download-grid,.timeline,.safety-grid{grid-template-columns:1fr}.guide-strip{grid-template-columns:1fr}.article-row{grid-template-columns:1fr;gap:8px}.article-row .row-link{grid-column:1}.article-meta{flex-direction:row}.feature-band{padding:18px}.two-column{gap:28px}.number-list li{grid-template-columns:1fr;gap:4px}.footer-grid{grid-template-columns:1fr;gap:34px}.footer-grid section:last-child{grid-column:auto}.footer-bottom{align-items:flex-start;flex-direction:column}.page-shell{padding-bottom:52px}.page-hero{padding-top:20px}.page-hero p:not(.eyebrow){font-size:16px}.table-row{grid-template-columns:1fr}.table-row.head{display:none}.table-row span{padding:8px 12px}.table-row span:first-child{font-weight:800;padding-top:14px}.table-row span:last-child{padding-bottom:14px;color:var(--muted)}.inset-section{padding:24px 16px}.catalog-item{grid-template-columns:1fr;padding:20px}.catalog-index{font-size:22px}.catalog-item>.text-link{grid-column:1}.prose-sections article{grid-template-columns:1fr;gap:8px}.search-row,.search-inline>div{flex-direction:column}.search-row button,.search-inline button{min-height:44px}.search-results article{grid-template-columns:1fr;gap:8px}.error-links{grid-template-columns:1fr}.search-page-head h1{font-size:36px}.article-header>img{margin-top:20px}.article-content h2{font-size:24px}.light-heading .button{width:100%}}
@media (max-width:390px){.header-inner{flex-wrap:wrap}.brand{flex:1 1 auto}.menu-toggle{order:3}.primary-nav{top:116px}.search-trigger{order:2}.hero h1,.page-hero h1,.article-header h1{font-size:32px}.button{font-size:13px}.section-heading h2,.content-section>h2,.editorial-copy h2,.feature-band h2,.two-column h2,.final-cta h2{font-size:28px}}