:root{
  --primary:#6F5AE8;--primary-2:#9A8CF2;--dark:#242433;--bg:#F8F8FC;--soft:#F0EEFA;--text:#30303A;--muted:#70707D;--accent:#F29A4A;--white:#fff;--line:#E2E0EC;--shadow:0 18px 50px rgba(36,36,51,.08);--radius:22px;--radius-sm:14px;--max: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:1.72;-webkit-font-smoothing:antialiased}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.container{width:min(var(--max),calc(100% - 48px));margin:0 auto}.narrow{max-width:880px}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.skip-link{position:fixed;left:16px;top:16px;z-index:1000;background:var(--dark);color:#fff;padding:10px 14px;border-radius:8px;transform:translateY(-150%)}.skip-link:focus{transform:none}.eyebrow{margin:0 0 10px;color:var(--primary);font-weight:800;font-size:.82rem;letter-spacing:.14em;text-transform:uppercase}.lead,.hero-lead{font-size:1.13rem;color:var(--muted);max-width:760px}.site-header{position:sticky;top:0;z-index:100;background:rgba(248,248,252,.92);backdrop-filter:saturate(140%) blur(16px);border-bottom:1px solid rgba(226,224,236,.86)}.header-inner{height:78px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:12px;min-width:230px}.brand img{width:42px;height:42px;object-fit:contain}.brand span{display:flex;flex-direction:column;line-height:1.18}.brand strong{font-size:1.02rem;color:var(--dark)}.brand small{margin-top:4px;color:var(--muted);font-size:.72rem}.site-nav{display:flex;align-items:center;justify-content:center;gap:4px;margin-left:auto}.site-nav a{padding:9px 12px;border-radius:10px;font-size:.93rem;color:#4b4b58}.site-nav a:hover,.site-nav a.is-active{background:var(--soft);color:var(--primary)}.search-open{border:1px solid var(--line);background:#fff;border-radius:12px;padding:9px 15px;color:var(--dark)}.menu-toggle{display:none;border:0;background:transparent;width:42px;height:42px;padding:9px}.menu-toggle span{display:block;height:2px;background:var(--dark);margin:5px 0;border-radius:2px}.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:300;display:grid;place-items:start center;padding-top:11vh}.search-backdrop{position:absolute;inset:0;background:rgba(25,25,34,.64);backdrop-filter:blur(5px)}.search-dialog{position:relative;width:min(720px,calc(100% - 32px));background:#fff;border-radius:24px;padding:32px;box-shadow:0 30px 100px rgba(0,0,0,.22)}.search-close{position:absolute;right:18px;top:14px;border:0;background:var(--soft);width:40px;height:40px;border-radius:50%;font-size:1.5rem}.search-dialog h2{margin:0 0 22px;font-size:1.8rem;color:var(--dark)}.search-form label{display:block;font-weight:700;margin-bottom:8px}.search-row{display:flex;gap:10px}.search-row input{min-width:0;flex:1;border:1px solid var(--line);border-radius:12px;padding:13px 15px;outline:none}.search-row input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(111,90,232,.12)}.search-row button{border:0;background:var(--primary);color:#fff;border-radius:12px;padding:0 20px;font-weight:800}.search-help{margin:12px 0 0;color:var(--muted);font-size:.9rem}.modal-open{overflow:hidden}.home-hero{padding:82px 0 62px;background:linear-gradient(180deg,#fff 0%,var(--bg) 100%)}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}.hero-copy h1{font-size:clamp(2.8rem,6vw,5.8rem);line-height:.98;letter-spacing:-.055em;margin:0;color:var(--dark)}.hero-lead{font-size:1.17rem;margin:25px 0}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.btn{display:inline-flex;justify-content:center;align-items:center;min-height:46px;border-radius:12px;padding:11px 18px;font-weight:800;transition:.2s transform,.2s box-shadow}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 24px rgba(111,90,232,.23)}.btn-accent{background:var(--accent);color:#2b2119;box-shadow:0 8px 24px rgba(242,154,74,.22)}.btn-light{background:#fff;color:var(--dark)}.text-link{display:inline-flex;align-items:center;gap:6px;color:var(--primary);font-weight:800}.hero-points{display:flex;flex-wrap:wrap;gap:8px 18px;padding:0;margin:24px 0 0;list-style:none;color:var(--muted);font-size:.89rem}.hero-points li:before{content:"✓";margin-right:6px;color:var(--primary);font-weight:900}.hero-media{margin:0;position:relative}.hero-media:before{content:"";position:absolute;inset:10% -5% -3% 10%;border-radius:40px;background:var(--soft);z-index:-1}.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:30px;box-shadow:var(--shadow)}.section{padding:84px 0}.section-tight{padding-top:54px}.band-soft{background:var(--soft)}.band-dark{background:var(--dark);color:#f4f3f8}.band-dark .eyebrow{color:#b9adff}.band-dark p,.band-dark .steps span{color:#c9c8d3}.section-heading{max-width:760px;margin-bottom:34px}.section-heading h2,.split-layout h2,.feature-strip h2,.final-cta h2{margin:0 0 14px;font-size:clamp(1.75rem,3vw,2.65rem);line-height:1.16;letter-spacing:-.025em;color:var(--dark)}.band-dark h2{color:#fff}.section-heading p:not(.eyebrow){margin:0;color:var(--muted)}.link-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.link-card{min-height:210px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;transition:.22s transform,.22s box-shadow,.22s 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article{background:#fff;border-radius:26px;padding:30px;border:1px solid var(--line)}.compare-grid h3{font-size:1.45rem;margin:14px 0 8px;color:var(--dark)}.compare-grid p{color:var(--muted)}.compare-grid a{color:var(--primary);font-weight:800}.pill{display:inline-flex;background:var(--soft);color:var(--primary);border-radius:999px;padding:6px 10px;font-size:.76rem;font-weight:800}.pill-accent{background:#fff1e4;color:#b75d11}.steps{list-style:none;padding:0;margin:26px 0}.steps li{display:grid;grid-template-columns:135px 1fr;gap:16px;border-top:1px solid rgba(255,255,255,.12);padding:14px 0}.steps b{color:#fff}.plain-list{padding-left:1.2em}.plain-list li{margin:.5em 0}.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.topic-card{border-top:3px solid var(--primary);background:#fff;padding:24px;border-radius:0 0 18px 18px;box-shadow:0 12px 35px rgba(36,36,51,.06)}.topic-card>span{font-size:.76rem;color:var(--primary);font-weight:800}.topic-card h3{font-size:1.12rem;line-height:1.35;color:var(--dark)}.topic-card p{font-size:.92rem;color:var(--muted)}.topic-card a{font-weight:800;color:var(--primary);font-size:.9rem}.feature-strip{padding-top:40px}.feature-strip-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;background:#fff;border-radius:30px;padding:40px;border:1px solid var(--line)}.feature-strip figure{margin:0}.feature-strip img{border-radius:22px;aspect-ratio:1.55;object-fit:cover}.stateless-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:20px 0}.stateless-grid span{background:rgba(255,255,255,.7);border:1px solid rgba(255,255,255,.9);padding:14px;border-radius:14px;font-size:.88rem}.stateless-grid b{display:block;color:var(--primary)}.faq-list{display:grid;gap:12px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}.faq-item h3{margin:0}.faq-question{width:100%;border:0;background:#fff;padding:18px 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50px;background:#fff}.page-hero-grid{display:grid;grid-template-columns:1fr .72fr;gap:48px;align-items:center}.page-hero-copy h1{font-size:clamp(2.35rem,5vw,4.5rem);line-height:1.03;letter-spacing:-.045em;margin:0 0 20px;color:var(--dark)}.page-hero-copy .lead{margin:0}.page-hero-media{margin:0}.page-hero-media img{width:100%;aspect-ratio:1.5;object-fit:cover;border-radius:24px}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:52px;align-items:start}.prose{font-size:1rem}.prose h2{font-size:1.65rem;line-height:1.3;color:var(--dark);margin:2.25em 0 .7em;letter-spacing:-.02em}.prose h2:first-child{margin-top:0}.prose h3{font-size:1.18rem;margin:1.8em 0 .5em}.prose p{margin:0 0 1.15em}.prose li{margin:.5em 0}.prose a{color:var(--primary);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.wide-prose{max-width:940px}.note{background:#fff;border-left:4px solid var(--accent);padding:18px 20px;border-radius:0 14px 14px 0;margin:24px 0}.article-aside{position:sticky;top:104px;display:grid;gap:16px}.aside-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.aside-card h2{font-size:1rem;margin:0 0 10px;color:var(--dark)}.aside-card a{display:block;padding:10px 0;border-top:1px solid var(--line);color:var(--primary);font-size:.9rem}.aside-card a:first-of-type{border-top:0}.article-aside figure{margin:0}.article-aside img{border-radius:18px;aspect-ratio:1.24;object-fit:cover}.number-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:26px 0}.number-grid>div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.number-grid b{font-size:.8rem;color:var(--primary)}.number-grid h3{margin:4px 0;font-size:1rem}.number-grid p{font-size:.9rem;color:var(--muted);margin:0}.decision-table{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px 0}.decision-table>div{border:1px solid 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span{width:52px;height:52px;background:var(--primary);color:#fff;border-radius:50%;display:grid;place-items:center;font-weight:900}.timeline-item p{margin:10px 0 0;background:#fff;border:1px solid var(--line);padding:18px;border-radius:16px}.search-page{min-height:60vh}.search-form-page{margin:24px 0 34px}.empty-state{background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px;text-align:center}.empty-state h2{margin-top:0}.empty-state a{color:var(--primary);font-weight:800}.search-results{display:grid;gap:14px}.result-count{color:var(--muted)}.search-results article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.search-results h2{font-size:1.15rem;margin:0 0 6px}.search-results h2 a{color:var(--dark)}.search-results p{color:var(--muted);margin:0 0 8px}.not-found{text-align:center;min-height:67vh}.not-found h1{font-size:clamp(2.2rem,6vw,4.6rem);margin:0;color:var(--dark)}.not-found .lead{margin:18px auto 34px}.not-found .link-card-grid{text-align:left}.site-footer{background:#1e1e2a;color:#d6d5de;padding:62px 0 24px}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}.footer-grid h2,.footer-grid h3{color:#fff}.footer-grid h2{margin-top:0}.footer-grid h3{font-size:.9rem;margin:0 0 12px}.footer-brand p{max-width:460px;color:#adabb8;font-size:.9rem}.footer-grid nav a{display:block;color:#bcbac6;font-size:.88rem;padding:5px 0}.footer-grid nav 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:42px;padding-top:20px;color:#908e9a;font-size:.78rem}.back-top{position:fixed;right:22px;bottom:22px;z-index:90;width:44px;height:44px;border:0;border-radius:50%;background:var(--dark);color:#fff;opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s}.back-top.is-visible{opacity:1;pointer-events:auto;transform:none}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#eceaf5;padding:.12em .35em;border-radius:5px;font-size:.9em}
@media (max-width:1080px){.topic-grid{grid-template-columns:1fr 1fr}.link-card-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1.4fr 1fr 1fr}.footer-grid nav:last-child{grid-column:2/4}.hero-grid,.split-layout{gap:40px}}
@media (max-width:900px){.container{width:min(100% - 34px,var(--max))}.header-inner{height:70px}.brand{min-width:0}.brand small{display:none}.menu-toggle{display:block;margin-left:auto}.site-nav{position:absolute;top:70px;left:16px;right:16px;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,.page-hero-grid,.split-layout,.feature-strip-grid{grid-template-columns:1fr}.hero-media{max-width:720px}.hero-grid{gap:38px}.home-hero{padding-top:54px}.page-hero-media{max-width:680px}.split-layout.reverse>div,.split-layout.reverse>figure{order:initial}.article-grid{grid-template-columns:1fr}.article-aside{position:static;grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid nav:last-child{grid-column:auto}.final-cta-inner{align-items:flex-start;flex-direction:column}.decision-table{grid-template-columns:1fr}.section{padding:68px 0}}
@media (max-width:680px){.container{width:min(100% - 28px,var(--max))}.home-hero{padding:42px 0}.hero-copy h1{font-size:3.2rem}.hero-actions,.cta-stack{align-items:stretch;flex-direction:column}.hero-actions .btn,.cta-stack .btn{width:100%}.hero-actions .text-link{justify-content:center;padding:10px}.hero-points{display:grid;gap:6px}.section{padding:54px 0}.link-card-grid,.topic-grid,.compare-grid,.number-grid,.stateless-grid{grid-template-columns:1fr}.link-card{min-height:180px}.feature-strip-grid{padding:24px}.article-aside{grid-template-columns:1fr}.page-hero{padding:42px 0}.page-hero-copy h1{font-size:2.55rem}.topic-article-list article{grid-template-columns:1fr;padding:22px}.topic-index{font-size:1.3rem}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column}.steps li{grid-template-columns:1fr;gap:3px}.search-dialog{padding:26px 18px}.search-row{flex-direction:column}.search-row button{padding:12px}.breadcrumbs ol{width:calc(100% - 28px);overflow-x:auto}.final-cta-inner{padding:28px}.back-top{right:14px;bottom:14px}}
@media (max-width:420px){.brand strong{font-size:.9rem}.brand img{width:36px;height:36px}.search-open{font-size:.85rem}.hero-copy h1{font-size:2.7rem}.hero-lead,.lead{font-size:1rem}.section-heading h2,.split-layout h2,.feature-strip h2,.final-cta h2{font-size:1.7rem}.page-hero-copy h1{font-size:2.2rem}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}