:root{color-scheme:dark;--bg:#080A0D;--panel:#0D1015;--article:#12161C;--secondary:#171C23;--hover:#1B2129;--text:#F5F7FA;--body:#C7CDD5;--muted:#9098A3;--blue:#5C7CFA;--bright:#6EA8FF;--ice:#8ED8FF;--line:rgba(255,255,255,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}a{color:var(--bright);text-decoration:none}a:hover{color:var(--ice)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--ice);outline-offset:4px}button{font:inherit}.container{width:min(100% - 48px,1200px);margin-inline:auto}.skip-link{position:absolute;left:12px;top:-60px;z-index:100;background:var(--blue);color:white;padding:8px 14px}.skip-link:focus{top:8px}.topbar{background:rgba(8,10,13,.96);border-bottom:1px solid var(--line)}.topbar-inner{height:76px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:10px;color:white;flex:none;min-width:210px}.brand img{max-height:36px;width:auto;max-width:140px;object-fit:contain}.brand small{font-size:9px;letter-spacing:.05em;color:var(--muted);line-height:1.4;max-width:100px}.main-nav{display:flex;align-items:stretch;justify-content:center;gap:19px;flex:1;white-space:nowrap;height:100%}.main-nav a{display:flex;align-items:center;position:relative;color:var(--body);font-size:14px}.main-nav a:hover,.main-nav a.active{color:var(--bright)}.main-nav a.active:after{content:'';height:2px;background:var(--bright);position:absolute;bottom:0;left:0;right:0}.enter-link{background:var(--blue);color:white;display:inline-flex;align-items:center;justify-content:center;border-radius:99px;padding:0 20px;height:42px;white-space:nowrap;font-size:14px;flex:none}.enter-link:hover{background:#7390FF;color:white}.menu-toggle{display:none}.quickbar{background:#10141A;border-bottom:1px solid var(--line)}.quickbar-inner{height:44px;display:flex;align-items:center;min-width:0}.quick-desktop{display:flex;align-items:center;gap:30px}.quick-desktop a,.quick-mobile a{font-size:13px;color:var(--muted);white-space:nowrap}.quick-desktop a:hover,.quick-mobile a:hover{color:var(--bright)}.quick-mobile{display:none}.breadcrumb{display:flex;gap:11px;flex-wrap:wrap;color:var(--muted);font-size:13px;padding:23px 0 0}.site-main{padding-bottom:72px;min-width:0}.page-intro{max-width:860px;padding:42px 0 24px}.eyebrow{color:var(--ice);font-size:12px;letter-spacing:.16em;text-transform:uppercase;font-weight:700}.page-intro h1{color:var(--text);font-size:34px;line-height:1.36;letter-spacing:-.025em;margin:12px 0 16px}.page-intro p{font-size:17px;line-height:1.8;max-width:780px}.page-kicker{color:var(--muted);font-size:13px}.article-shell{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:52px;align-items:start}.article-body{min-width:0;max-width:820px}.article-body h2,.section-heading h2{font-size:26px;line-height:1.4;color:var(--text);margin:45px 0 16px}.article-body h3{font-size:19px;line-height:1.4;color:var(--text);margin:24px 0 12px}.article-body p{margin:0 0 17px}.article-body ul,.article-body ol{padding-left:1.5em}.article-body li{margin:0 0 11px}.aside-index{border-top:2px solid var(--blue);background:var(--panel);padding:20px 22px;border-radius:0 0 12px 12px;position:sticky;top:18px}.aside-index h2{font-size:16px;color:white;margin:0 0 12px}.aside-index a{display:block;padding:9px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--body)}.aside-index a:hover{color:var(--ice)}.reading-more{margin-top:58px;border-top:1px solid var(--line);padding-top:24px}.reading-more h2{font-size:22px;color:white}.related-links{display:flex;flex-wrap:wrap;gap:12px}.related-links a{padding:10px 15px;background:var(--article);border:1px solid var(--line);border-radius:10px;font-size:14px}.reading-more span{margin-left:9px;color:var(--muted)}.note{background:var(--article);border-left:2px solid var(--bright);padding:17px 22px;margin:25px 0;border-radius:0 12px 12px 0}.note strong{color:var(--text)}.info-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px;margin:26px 0}.info-card{background:var(--article);border:1px solid var(--line);padding:22px;border-radius:13px;min-width:0}.info-card h3{color:var(--text);font-size:18px;margin:0 0 9px}.info-card p{font-size:15px;margin:0}.steps{counter-reset:stage;margin:25px 0}.step{border-top:1px solid var(--line);padding:22px 0 22px 58px;position:relative}.step:before{counter-increment:stage;content:counter(stage,decimal-leading-zero);position:absolute;left:0;top:22px;color:var(--ice);font-size:19px;font-weight:bold}.step h3{margin:0 0 9px;color:white}.step p{margin:0}.data-table{border-collapse:collapse;width:100%;margin:24px 0;font-size:14px}.data-table th,.data-table td{border-bottom:1px solid var(--line);padding:13px 14px;text-align:left;vertical-align:top}.data-table th{color:white;background:var(--article)}.data-table tr:nth-child(even) td{background:rgba(255,255,255,.025)}.full-bleed-section{margin:50px 0}.section-heading{display:flex;justify-content:space-between;gap:18px;align-items:end;border-bottom:1px solid var(--line);padding-bottom:15px;margin-bottom:22px}.section-heading h2{margin:0}.section-heading small{color:var(--muted)}.media{margin:0;min-width:0;max-width:100%;background:var(--panel);border:1px solid var(--line);border-radius:13px;overflow:hidden;display:flex;align-items:center;justify-content:center}.media img{width:100%;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center center;display:block}.media-placeholder{height:100%;min-height:120px;width:100%;background:linear-gradient(145deg,#10151e,#191e29);position:relative}.media-placeholder:before{content:'';width:32px;height:32px;border:1px solid rgba(142,216,255,.2);border-radius:50%;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.media--hero{height:300px}.media--banner{max-height:245px}.media--feature{max-height:245px}.media--normal{max-height:180px;min-height:130px}.media--gallery{max-height:245px;min-height:150px}.media--device{width:min(100%,270px);max-height:340px}.media--gif{max-height:175px}.image-caption{font-size:13px;line-height:1.65;color:var(--muted);margin:10px 0 20px}.illustrated{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:28px;align-items:center;margin:35px 0}.illustrated>*{min-width:0}.illustrated .media{max-height:245px}.feature-split{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:40px;align-items:start}.hero-home{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:36px;align-items:center;margin:42px 0 66px}.hero-copy h1{font-size:41px;line-height:1.35;color:white;margin:12px 0 18px}.hero-copy p{font-size:16px}.text-links{display:flex;flex-wrap:wrap;gap:18px;margin-top:23px}.text-links a{font-weight:700}.text-links a:after{content:' →'}.home-section{margin:54px 0}.home-section h2{font-size:27px;line-height:1.4;color:var(--text);margin:0 0 18px}.home-section p{margin:0 0 16px}.home-topics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.topic-entry{padding:25px;border-top:1px solid var(--line);background:var(--panel)}.topic-entry h3{font-size:20px;color:white;margin:0 0 8px}.topic-entry p{font-size:15px}.topic-entry a{display:inline-block;margin-top:8px}.editorial-cols{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,.8fr);gap:50px}.numbered-index{border-top:2px solid var(--blue);padding-top:8px}.numbered-index>div{border-bottom:1px solid var(--line);padding:15px 0}.numbered-index b{color:var(--ice);margin-right:14px}.numbered-index a{color:var(--text)}.three-images{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.visual-item{min-width:0}.visual-item .media{height:170px}.visual-item h3{color:white;font-size:17px;margin:11px 0 5px}.visual-item p{font-size:14px}.visual-notes{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:17px}.visual-notes .media{height:145px}.index-rows{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:45px}.index-row{display:flex;gap:16px;border-top:1px solid var(--line);padding:18px 0}.index-row .index-num{font-size:15px;font-weight:bold;color:var(--ice)}.index-row h3{font-size:18px;margin:0 0 6px}.index-row p{font-size:14px}.mobile-feature{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:42px;align-items:center}.mobile-feature .media{justify-self:center}.notice-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0;display:flex;justify-content:space-between;gap:25px}.notice-strip p{margin:0}.image-wall{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:28px 0}.image-wall .media{height:215px}.image-wall .wall-wide{grid-column:span 2}.image-wall .wall-wide .media{height:245px}.catalog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.catalog-grid .media{height:195px}.catalog-item{border-bottom:1px solid var(--line);padding-bottom:15px}.catalog-item h3{color:white;font-size:18px;margin:11px 0 9px}.catalog-item p{font-size:14px;margin:0}.catalog-heading{color:var(--ice);font-size:18px;margin:34px 0 17px}.faq-list details{padding:16px 0;border-bottom:1px solid var(--line)}.faq-list summary{cursor:pointer;color:white;font-weight:700}.faq-list details p{padding-left:15px;border-left:2px solid var(--blue);margin:15px 0 4px}.site-footer{background:#050608;border-top:1px solid var(--line)}.footer-layout{display:grid;grid-template-columns:1fr 1.5fr .75fr;gap:45px;padding:50px 0 34px}.footer-logo{color:white;font-size:25px;font-weight:bold}.footer-logo img{max-height:36px;width:auto;max-width:140px;object-fit:contain}.footer-brand p{font-size:14px;color:var(--muted)}.site-footer h2{font-size:16px;color:white;margin:0 0 16px}.footer-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px 16px}.footer-services .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-links a{font-size:13px;color:var(--muted);padding:3px 0}.footer-bottom{border-top:1px solid var(--line);padding:20px 0 28px;display:flex;gap:25px;align-items:center;font-size:12px;color:var(--muted)}.footer-bottom p{margin:0}.back-top{position:fixed;right:18px;bottom:18px;width:42px;height:42px;background:var(--blue);color:white;border:none;border-radius:50%;cursor:pointer;opacity:0;visibility:hidden;transition:opacity .2s}.back-top.shown{opacity:1;visibility:visible}.drawer-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.67);z-index:40;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-backdrop.is-open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer{position:fixed;inset:0 auto 0 0;width:min(86vw,390px);background:var(--panel);z-index:41;overflow-y:auto;visibility:hidden;pointer-events:none;transform:translateX(-102%);transition:transform .24s,visibility .24s;padding:18px 22px}.site-drawer.is-open{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:14px}.drawer-brand{color:white;font-weight:700;font-size:21px}.drawer-brand small{display:block;font-size:9px;color:var(--muted)}.drawer-close{border:1px solid var(--line);background:var(--article);color:white;font-size:25px;width:38px;height:38px;cursor:pointer}.drawer-group{margin:22px 0}.drawer-group h2{font-size:13px;letter-spacing:.1em;color:var(--ice);margin:0 0 7px}.drawer-group a{display:block;padding:7px 4px;color:var(--body);font-size:14px}.drawer-group a:hover{color:var(--bright)}@media(max-width:1100px){.topbar-inner{gap:14px}.brand{min-width:190px}.main-nav{gap:12px}.main-nav a{font-size:13px}}@media(max-width:979px){.container{width:min(100% - 40px,1200px)}.topbar-inner{height:64px;justify-content:space-between;position:relative}.menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;align-items:center;width:40px;height:40px;flex:none;border:1px solid var(--line);background:var(--article);border-radius:9px;cursor:pointer}.menu-toggle span{display:block;width:18px;height:2px;background:white}.main-nav{display:none}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0;max-width:32vw;justify-content:center}.brand img{max-height:28px;max-width:100%;width:auto}.brand small{display:none}.enter-link{height:40px;padding:0 13px;font-size:12px}.quickbar-inner{height:43px}.quick-desktop{display:none}.quick-mobile{display:flex;align-items:center;gap:26px;width:100%;height:100%;overflow-x:auto;scrollbar-width:none}.quick-mobile::-webkit-scrollbar{display:none}.article-shell{grid-template-columns:minmax(0,1fr)}.aside-index{position:static;display:none}.footer-layout{grid-template-columns:1fr 1.4fr;gap:32px}.footer-services{grid-column:1/-1}.footer-services .footer-links{grid-template-columns:repeat(4,minmax(0,1fr))}.editorial-cols{gap:26px}.hero-home{gap:26px}.hero-copy h1{font-size:34px}}@media(max-width:768px){.hero-home,.feature-split,.illustrated,.mobile-feature,.editorial-cols{grid-template-columns:1fr}.hero-home .media{grid-row:1}.hero-home{margin:30px 0 44px}.hero-copy h1{font-size:30px}.hero-home .media{height:240px}.section-heading h2,.home-section h2{font-size:23px}.page-intro{padding-top:24px}.page-intro h1{font-size:27px}.page-intro p{font-size:16px}.article-body h2{font-size:22px}.three-images{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-notes{grid-template-columns:repeat(2,minmax(0,1fr))}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.image-wall{grid-template-columns:repeat(2,minmax(0,1fr))}.mobile-feature .media{grid-row:1}.notice-strip{display:block}.footer-layout{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-services{grid-column:1/-1}}@media(max-width:500px){.container{width:calc(100% - 32px)}body{font-size:15px;line-height:1.8}.brand{max-width:35vw}.brand img{max-width:100%;height:auto;max-height:28px}.brand strong{font-size:18px}.enter-link{padding:0 12px}.hero-copy h1{font-size:28px}.hero-home .media{height:190px}.home-topics,.info-grid,.index-rows{grid-template-columns:1fr}.three-images,.visual-notes{grid-template-columns:1fr 1fr;gap:12px}.visual-item .media,.visual-notes .media{height:140px}.catalog-grid{gap:13px}.catalog-grid .media{height:160px}.image-wall{grid-template-columns:1fr}.image-wall .wall-wide{grid-column:auto}.image-wall .media,.image-wall .wall-wide .media{height:200px}.section-heading{align-items:start}.section-heading small{display:none}.footer-layout{gap:23px}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-services .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{display:block}.media--hero{height:190px}.media--banner{max-height:145px}.media--feature{max-height:185px}.media--normal{max-height:155px}.media--gif{max-height:145px}.media--device{max-width:220px}.site-main{padding-bottom:45px}.home-section{margin:35px 0}.topic-entry{padding:18px}.step{padding-left:47px}}@media(max-width:350px){.brand{max-width:32vw}.brand strong{font-size:16px}.enter-link{font-size:11px;padding:0 9px}.catalog-grid,.three-images,.visual-notes{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}