*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#000;color:#ddd;font:16px/1.76 system-ui,-apple-system,"Microsoft YaHei",sans-serif;overflow-x:hidden}body.panel-active{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:4px}button,input{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #fff;outline-offset:3px}.wrap{width:min(1240px,calc(100% - 48px));margin-inline:auto}.site-header{position:sticky;top:0;background:#050505;z-index:30;border-bottom:1px solid #ffffff20}.topbar{height:72px;display:flex;align-items:center;gap:30px}.brand{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:24px;color:#f7f7f7}.logo{height:32px;width:auto;max-width:95px;object-fit:contain}.brand-sub{display:flex;flex-direction:column;font-size:12px;letter-spacing:.12em;color:#c7c7c7;line-height:1.4}.brand-sub small{color:#a5a5a5;letter-spacing:0;font-size:12px}.top-actions{display:flex;gap:8px;margin-left:auto}.top-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 16px;background:transparent;color:#f7f7f7;border:1px solid #ffffff35;border-radius:4px;font-size:14px;white-space:nowrap}.top-button:hover,.top-button[aria-expanded=true]{background:#fff;color:#000;text-decoration:none}.primary-nav{height:48px;border-top:1px solid #ffffff15}.primary-inner{display:flex;align-items:stretch;gap:clamp(12px,2vw,32px);height:100%;white-space:nowrap}.primary-inner a{display:flex;align-items:center;border-bottom:2px solid transparent;font-size:14px;color:#c7c7c7}.primary-inner a[aria-current=page]{border-color:#f7f7f7;color:white}.main-area{padding-top:34px;padding-bottom:64px;min-height:60vh}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(28px,3vw,34px);line-height:1.3;color:#f7f7f7}h2{color:#f7f7f7;line-height:1.35;font-size:clamp(21px,2vw,26px)}h3{color:#f7f7f7;font-size:18px;line-height:1.35}p{max-width:80ch}small,.muted{color:#a5a5a5}.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:12px;color:#c7c7c7}.page-intro{padding:16px 0 38px;border-bottom:1px solid #ffffff30}.page-intro p{max-width:850px}.page-intro .related{margin-top:16px}.related,.actions{display:flex;gap:10px;flex-wrap:wrap}.action,.related a,.text-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:7px 16px;border:1px solid #ffffff65;border-radius:4px;font-size:14px}.action.primary{background:white;color:#000;border-color:white}.action:hover,.related a:hover,.text-link:hover{background:#1a1a1a;color:white;text-decoration:none}.section{padding:44px 0;border-bottom:1px solid #ffffff20}.section-head{display:flex;justify-content:space-between;gap:24px;align-items:baseline;margin-bottom:22px}.section-head a,.inline-link{color:#fff;text-decoration:underline;text-underline-offset:4px}.grid{display:grid;gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.tile{padding:24px;border:1px solid #ffffff23;background:#0b0b0b;border-radius:6px;min-width:0}.tile p:last-child{margin-bottom:0}.tile h3 a:hover{text-decoration:underline}.strip{display:grid;grid-template-columns:190px minmax(0,1fr);gap:26px;padding:25px 0;border-bottom:1px solid #ffffff22}.strip:last-child{border:0}.strip h2,.strip h3{margin-bottom:8px}.strip p{margin-bottom:12px}.media{margin:0;display:flex;align-items:flex-start;justify-content:center;min-width:0}.content-image{display:block;width:100%;height:auto;max-width:100%;object-fit:contain;object-position:center}.hero-image img{max-height:300px;width:auto;max-width:100%;margin-inline:auto}.feature-image img{max-height:260px;width:auto;max-width:100%}.minor-image img{max-height:240px;width:auto;max-width:100%}.app-image img{max-height:420px;width:auto;max-width:100%}.icon-small{display:block;width:60px;height:auto;max-height:72px;object-fit:contain}.hero-copy{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:center;margin-top:26px}.hero-copy p{max-width:60ch}.feature-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:35px;align-items:start}.feature-layout.has-media{grid-template-columns:minmax(0,.72fr) minmax(0,1fr) minmax(0,1.1fr)}.feature-layout .media{max-width:340px}.duo-media{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:32px;align-items:center}.duo-media .media{max-width:440px}.duo-media:not(.has-media){grid-template-columns:1fr}.directory-row{padding:24px 0;border-top:1px solid #ffffff25;display:grid;grid-template-columns:60px minmax(0,1fr) auto;gap:20px;align-items:start}.directory-row .number{color:#a5a5a5}.directory-row p{max-width:82ch}.topic-band{display:grid;grid-template-columns:180px 1fr auto;gap:24px;align-items:center;border-top:1px solid #ffffff24;padding:24px 0}.status{display:inline-block;padding:3px 10px;background:#c7c7c7;color:#000;border-radius:3px;font-size:12px;white-space:nowrap}.prose{max-width:850px}.prose p{max-width:76ch}.prose-section{padding:30px 0;border-bottom:1px solid #ffffff26}.prose-section h2{margin-bottom:12px}.article-layout{display:grid;grid-template-columns:minmax(0,830px) minmax(220px,1fr);gap:42px}.aside-box{border:1px solid #ffffff30;padding:22px;align-self:start;background:#0b0b0b}.aside-box a{display:block;padding:8px 0;text-decoration:underline}.faq-item{padding:25px 0;border-bottom:1px solid #ffffff24;max-width:900px}.faq-item h2{font-size:19px}.faq-item p{max-width:78ch}.site-footer{background:#050505;border-top:1px solid #ffffff25;padding:52px 0 25px}.footer-top{display:grid;grid-template-columns:225px minmax(0,1fr);gap:42px}.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:4px}.footer-logo{height:30px;width:auto;max-width:100px;object-fit:contain}.footer-brand strong{font-size:24px;color:#fff}.footer-brand span{font-size:12px;letter-spacing:.12em}.footer-brand p{margin-top:15px;color:#a5a5a5;font-size:13px}.footer-groups{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px}.footer-group h2{font-size:15px;margin-bottom:14px}.footer-group a{display:block;font-size:13px;color:#a5a5a5;margin:8px 0}.footer-bottom{border-top:1px solid #ffffff25;padding-top:20px;margin-top:38px;color:#a5a5a5;font-size:12px}.footer-bottom p{max-width:none}.overlay{position:fixed;inset:0;background:#000b;z-index:40}.overlay[hidden]{display:none!important}.floating-panel{position:fixed;z-index:45;top:120px;left:0;right:0;background:#121212;border-bottom:1px solid #ffffff65;max-height:70dvh;overflow-y:auto;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .16s ease}.floating-panel.is-open{visibility:visible;pointer-events:auto;opacity:1}.panel-inner{padding-top:18px;padding-bottom:24px}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:18px;padding-bottom:18px;border-bottom:1px solid #ffffff30}.panel-head h2{margin:0;font-size:22px}.panel-brand{display:flex;align-items:center;gap:14px}.close-panel{min-height:44px;border:1px solid #ffffff55;background:#0b0b0b;color:#fff;border-radius:4px;padding:0 16px}.menu-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:26px;margin-top:20px}.menu-group h3{font-size:15px;color:#c7c7c7}.menu-group a{display:block;padding:10px 0;border-top:1px solid #ffffff20}.menu-group strong{display:block;color:white;font-size:14px}.menu-group span{display:block;color:#a5a5a5;font-size:12px;line-height:1.5}.search-panel{left:auto;right:max(24px,calc((100vw - 1240px)/2));width:min(430px,calc(100vw - 32px));top:72px;border:1px solid #ffffff50;border-radius:0 0 6px 6px}.search-inside{padding:22px}.search-inside label{display:block;margin:20px 0 8px}.search-inside input{background:#050505;color:#fff;border:1px solid #ffffff70;border-radius:4px;padding:10px 12px;width:100%;min-height:44px}.search-inside .muted{font-size:12px;margin:8px 0 16px}.search-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.search-links a{padding:10px;border:1px solid #ffffff35;border-radius:4px;font-size:14px}.search-links a[hidden]{display:none}.mobile-bottom{display:none}.lead-note{border-left:2px solid #c7c7c7;padding-left:18px;color:#c7c7c7}.index-quick a{display:block;height:100%;text-decoration:none}.index-quick a:hover{background:#1a1a1a}.app-block{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:40px;align-items:center}.app-block:not(.has-media){grid-template-columns:1fr}.small-icon-line{display:flex;align-items:center;gap:14px}.small-icon-line h2{margin:0}.shorts-list{max-width:1050px}.breadcrumb{color:#a5a5a5;font-size:13px;margin-bottom:10px}.breadcrumb a{text-decoration:underline}@media(max-width:1100px){.primary-inner{gap:17px}.primary-inner a:nth-last-child(-n+2){display:none}.footer-groups{grid-template-columns:repeat(3,minmax(0,1fr))}.feature-layout.has-media{grid-template-columns:minmax(0,1fr) minmax(0,1.3fr)}.feature-layout.has-media>.media{grid-column:1/-1;max-width:480px}}@media(max-width:800px){.primary-nav{display:none}.floating-panel{top:72px}.menu-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.brand-sub{display:none}.grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}.article-layout{grid-template-columns:1fr}.aside-box{max-width:850px}.footer-top{grid-template-columns:1fr}.feature-layout,.feature-layout.has-media{grid-template-columns:1fr 1fr}.feature-layout.has-media>.media{grid-column:1/-1}}@media(max-width:600px){.wrap{width:calc(100% - 32px)}.topbar{height:60px;gap:8px}.brand{font-size:20px;gap:5px}.logo{height:28px;max-width:55px}.top-actions{gap:4px}.top-button{padding:0 8px;font-size:13px;min-width:44px}.desktop-app{display:none}.main-area{padding-top:22px;padding-bottom:98px}.hero-copy,.feature-layout,.feature-layout.has-media,.duo-media,.app-block,.app-block.has-media{grid-template-columns:1fr;gap:19px}.hero-copy{margin-top:20px}.feature-layout.has-media>.media{grid-column:auto}.grid.two,.grid.three,.grid.four{grid-template-columns:1fr 1fr;gap:10px}.tile{padding:15px}.grid.three .tile{grid-column:span 2}.section{padding:32px 0}.section-head{display:block}.directory-row{grid-template-columns:35px minmax(0,1fr);gap:12px}.directory-row>.text-link{grid-column:2;justify-self:start}.strip{grid-template-columns:1fr;gap:8px}.topic-band{grid-template-columns:1fr;gap:8px}.topic-band .text-link{justify-self:start}.footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-top{gap:22px}.footer-group h2{font-size:14px}.mobile-bottom{position:fixed;bottom:0;left:0;right:0;z-index:35;background:#0b0b0b;border-top:1px solid #ffffff45;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));height:calc(56px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a,.mobile-bottom button{display:flex;align-items:center;justify-content:center;min-width:0;min-height:44px;background:none;color:#ddd;font-size:12px;border:0;padding:0 1px}.mobile-bottom a[aria-current=page]{color:#fff;border-top:2px solid #fff;font-weight:700}.floating-panel{top:60px;max-height:70dvh}.menu-grid{grid-template-columns:1fr;gap:12px}.menu-group a{padding:8px 0}.panel-inner{padding-top:12px}.search-panel{right:16px;left:16px;width:auto}.app-image img{max-height:360px}.hero-image img{max-height:300px}.page-intro{padding-bottom:26px}.page-intro .related{gap:7px}}@media(max-width:360px){.brand{font-size:18px}.brand .logo{max-width:40px}.top-actions{gap:2px}.top-button{padding:0 5px;font-size:12px}.grid.four .tile{padding:12px}.grid.four .tile h3{font-size:16px}}