*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#080A0D;color:#C7CDD5;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}a:hover{color:#8ED8FF}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid #8ED8FF;outline-offset:4px}button{font:inherit;cursor:pointer}.container{max-width:1200px;margin-inline:auto;padding-inline:24px;min-width:0}.skip-link{position:absolute;top:-100px;left:10px;z-index:200;color:#fff;background:#5C7CFA;padding:6px 16px}.skip-link:focus{top:10px}.site-header{background:rgba(8,10,13,.96);border-bottom:1px solid rgba(255,255,255,.09);position:relative;z-index:20}.header-inner{height:76px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:10px;min-width:0;flex:0 0 225px}.brand-logo{margin:0;display:flex;align-items:center;min-height:28px}.brand-logo img{width:auto;max-width:135px;max-height:36px;object-fit:contain}.brand-logo.missing-media{width:112px;height:32px}.brand-english{font-size:10px;line-height:1.25;letter-spacing:.04em;color:#9098A3}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:20px;flex:1;min-width:0}.desktop-nav a{font-size:14px;white-space:nowrap;line-height:76px;border-bottom:2px solid transparent}.desktop-nav a.active,.desktop-nav a[aria-current]{color:#6EA8FF;border-bottom-color:#6EA8FF}.entry-button{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;padding:0 21px;height:42px;border-radius:999px;background:#5C7CFA;color:#fff;font-weight:700;font-size:14px}.entry-button:hover{background:#7390FF;color:white}.menu-toggle{display:none}.quickbar{background:#10141A;border-bottom:1px solid rgba(255,255,255,.09)}.quick-inner{height:45px}.quick-desktop{display:flex;align-items:center;justify-content:center;gap:36px;height:100%;font-size:13px}.quick-mobile{display:none}.main-content{padding-top:34px;padding-bottom:90px;min-height:58vh}.breadcrumb{display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:13px;color:#9098A3;margin-bottom:38px}.breadcrumb a{color:#8ED8FF}h1,h2,h3{color:#F5F7FA;line-height:1.38;margin-top:0}h1{font-size:35px;letter-spacing:-.025em;margin-bottom:22px}h2{font-size:26px}h3{font-size:20px}p{margin:0 0 16px}section{min-width:0}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.18em;color:#8ED8FF;font-weight:700;margin-bottom:14px}.lead{font-size:17px;color:#C7CDD5;max-width:840px}.page-intro{max-width:850px;margin:0 auto 36px}.page-intro h1{max-width:850px}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:55px;align-items:start}.article{min-width:0;max-width:820px}.article-section{border-top:1px solid rgba(255,255,255,.12);padding-top:27px;margin-top:32px}.article-section p{line-height:1.84}.article-section h2{margin-bottom:17px}.article-index{position:sticky;top:20px;padding:23px;background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:13px}.article-index h2{font-size:17px;margin-bottom:15px}.article-index a{display:block;padding:8px 0;font-size:14px;border-bottom:1px solid rgba(255,255,255,.06)}.article-index a:last-child{border-bottom:0}.related{margin-top:60px;padding:26px 0;border-top:1px solid rgba(255,255,255,.16)}.related h2{font-size:22px}.related-links{display:flex;gap:10px;flex-wrap:wrap}.related-link,.text-link{display:inline-flex;align-items:center;gap:7px;color:#8ED8FF;border-bottom:1px solid rgba(142,216,255,.35);font-size:14px}.related-link{padding:7px 11px;border:1px solid rgba(142,216,255,.2);border-radius:8px}.related-link:hover{background:#171C23}.media-box{margin:0;background:#0D1015;border:1px solid rgba(255,255,255,.09);border-radius:14px;overflow:hidden;display:flex;justify-content:center;align-items:center;min-width:0;max-width:100%;padding:12px;min-height:140px}.media-box img{display:block;width:auto;max-width:100%;height:auto;max-height:245px;object-fit:contain;object-position:center}.missing-media{min-height:140px;background:linear-gradient(135deg,#12161C,#0D1015)}.wide-media img{max-height:240px}.hero-media img{max-height:300px}.device-media{max-width:270px;margin-inline:auto}.device-media img{max-height:340px}.gif-media img{max-height:175px}.image-caption{color:#9098A3;font-size:13px;margin-top:8px}.feature-image{margin:30px 0}.feature-image .media-box img{max-height:240px}.hero{display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);gap:36px;align-items:center;padding:35px 0 50px;border-bottom:1px solid rgba(255,255,255,.12)}.hero h1{font-size:42px}.hero-links{display:flex;gap:24px;margin-top:24px}.editorial-section{margin-top:58px}.editorial-section>h2{margin-bottom:24px}.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:27px}.four-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.topic-entry{padding:24px;background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:13px}.topic-entry h3{font-size:20px;margin-bottom:10px}.topic-entry p{font-size:15px}.split{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:44px;align-items:start}.split.equal{grid-template-columns:repeat(2,minmax(0,1fr))}.split.reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);align-items:center}.numbered-notes{counter-reset:notes;padding:0;list-style:none}.numbered-notes li{counter-increment:notes;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.12);font-size:15px}.numbered-notes li:before{content:counter(notes,decimal-leading-zero);color:#8ED8FF;font-size:12px;letter-spacing:.1em;margin-right:16px}.visual-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.visual-grid figure{margin:0;min-width:0}.visual-grid figcaption{padding:10px 3px;color:#C7CDD5;font-size:14px}.visual-grid .media-box img{max-height:175px}.visual-grid.mosaic{grid-template-columns:repeat(4,minmax(0,1fr))}.visual-grid.mosaic .media-box img{max-height:180px}.visual-grid.gallery-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-grid.gallery-grid .media-box img{max-height:260px}.tiny-heading{display:block;font-size:12px;letter-spacing:.1em;color:#8ED8FF;margin-bottom:8px}.indexed-list{border-top:1px solid rgba(255,255,255,.14)}.indexed-item{display:grid;grid-template-columns:60px minmax(0,1fr) 160px;gap:14px;align-items:start;padding:22px 0;border-bottom:1px solid rgba(255,255,255,.09)}.indexed-num{color:#8ED8FF;font-size:13px}.indexed-item h3{font-size:19px;margin-bottom:8px}.indexed-item p{font-size:15px;margin-bottom:0}.indexed-item>a{font-size:14px;color:#8ED8FF}.site-table{width:100%;border-collapse:collapse;margin:25px 0;background:#12161C}.site-table th,.site-table td{border:1px solid rgba(255,255,255,.12);padding:15px;text-align:left;vertical-align:top;font-size:14px}.site-table th{color:#F5F7FA;background:#171C23}.faq-list details{border-bottom:1px solid rgba(255,255,255,.12);padding:17px 0}.faq-list summary{font-size:17px;font-weight:bold;color:#F5F7FA;cursor:pointer}.faq-list p{max-width:800px;padding-top:15px}.subtle-band{background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:13px;padding:24px}.site-footer{background:#050608;border-top:1px solid rgba(255,255,255,.09)}.footer-grid{padding-top:54px;padding-bottom:40px;display:grid;grid-template-columns:1.1fr 1.2fr .9fr;gap:55px}.footer-grid h2{font-size:17px}.footer-brand p{font-size:14px;color:#9098A3;margin-top:17px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px 13px}.footer-links a{font-size:13px}.foot-bottom{padding-top:21px;padding-bottom:25px;border-top:1px solid rgba(255,255,255,.09);font-size:12px;color:#9098A3;display:flex;justify-content:space-between;gap:18px}.drawer,.drawer-overlay{visibility:hidden;pointer-events:none;position:fixed;z-index:75;transition:transform .22s ease,opacity .22s ease,visibility .22s ease}.drawer-overlay{inset:0;background:rgba(0,0,0,.72);opacity:0}.drawer-overlay.is-visible{visibility:visible;pointer-events:auto;opacity:1}.drawer{top:0;bottom:0;left:0;background:#0D1015;width:min(390px,86vw);transform:translateX(-101%);overflow-y:auto;overscroll-behavior:contain;padding:20px 24px}.drawer.is-open{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid rgba(255,255,255,.13);padding-bottom:20px}.drawer-close{font-size:29px;color:#fff;background:transparent;border:0}.drawer-group{border-bottom:1px solid rgba(255,255,255,.09);padding:15px 0}.drawer-group h2{font-size:14px;color:#8ED8FF;margin:0 0 10px}.drawer-links{display:grid;grid-template-columns:1fr 1fr;gap:8px}.drawer-links a{font-size:14px}.menu-open{overflow:hidden}.backtop{position:fixed;right:22px;bottom:22px;background:#5C7CFA;color:#fff;border:0;border-radius:50%;width:42px;height:42px;opacity:0;pointer-events:none;transition:opacity .2s}.backtop.is-visible{opacity:1;pointer-events:auto}
@media(max-width:1140px){.brand{flex-basis:170px}.brand-english{display:none}.desktop-nav{gap:13px}.header-inner{gap:12px}}@media(max-width:979px){.container{padding-inline:20px}.header-inner{height:64px;justify-content:space-between;position:relative}.menu-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;background:transparent;border:1px solid rgba(255,255,255,.16);border-radius:9px;z-index:2;flex-shrink:0}.menu-toggle span{width:18px;height:2px;background:#F5F7FA}.brand{position:absolute;left:50%;transform:translateX(-50%);flex:0 0 auto;justify-content:center;width:112px;pointer-events:auto}.brand-logo img{max-height:28px;max-width:108px}.desktop-nav{display:none}.entry-button{margin-left:auto;height:39px;padding:0 14px;font-size:12px}.quick-inner{height:44px;overflow-x:auto;scrollbar-width:none;padding-inline:20px}.quick-inner::-webkit-scrollbar{display:none}.quick-desktop{display:none}.quick-mobile{display:flex;align-items:center;gap:29px;white-space:nowrap;min-width:max-content;height:100%;font-size:14px}.article-grid{grid-template-columns:1fr}.article-index{position:static;order:-1}.footer-grid{gap:25px}}@media(max-width:767px){.container{padding-inline:16px}.main-content{padding-top:25px;padding-bottom:60px}.breadcrumb{margin-bottom:23px}h1{font-size:26px}h2{font-size:21px}h3{font-size:18px}body{font-size:15px}.lead{font-size:16px}.hero{grid-template-columns:1fr;gap:22px;padding-top:16px}.hero h1{font-size:30px}.hero .hero-text{order:1}.hero .hero-visual{order:2}.hero-links{gap:18px;flex-wrap:wrap}.editorial-section{margin-top:34px}.two-col,.four-col,.split,.split.equal,.split.reverse{grid-template-columns:1fr;gap:19px}.visual-grid,.visual-grid.mosaic{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.visual-grid.gallery-grid{grid-template-columns:1fr}.visual-grid .media-box img{max-height:155px}.topic-entry{padding:17px}.article-section{padding-top:22px;margin-top:28px}.media-box{padding:9px}.hero-media img{max-height:205px}.wide-media img{max-height:145px}.device-media{max-width:220px}.gif-media img{max-height:145px}.indexed-item{grid-template-columns:32px minmax(0,1fr);gap:12px}.indexed-item>a{grid-column:2}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.foot-bottom{flex-direction:column;gap:6px}.site-table th,.site-table td{padding:9px;font-size:12px}}@media(max-width:359px){.brand{width:95px}.brand-logo img{max-width:90px}.entry-button{padding:0 10px;font-size:12px}.visual-grid,.visual-grid.mosaic{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
