*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:0;background:#080A0D;color:#C7CDD5;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#8ED8FF;text-decoration:none}a:hover{color:#fff}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid #8ED8FF;outline-offset:4px}button{font:inherit;cursor:pointer}img{display:block;max-width:100%;height:auto}h1,h2,h3,p,figure{margin-top:0}h1,h2,h3{color:#F5F7FA;line-height:1.38}h1{font-size:clamp(27px,3vw,35px);letter-spacing:-.025em}h2{font-size:clamp(21px,2.4vw,27px);margin-bottom:17px}h3{font-size:19px}p{margin-bottom:17px}.wrap{width:min(100% - 48px,1200px);margin-inline:auto;min-width:0}.skip-link{position:absolute;top:-80px;left:15px;z-index:300;background:#5C7CFA;color:white;padding:8px 16px}.skip-link:focus{top:8px}.site-header{background:rgba(8,10,13,.96);border-bottom:1px solid rgba(255,255,255,.09)}.header-main{height:76px;display:flex;align-items:center;justify-content:space-between;gap:16px}.site-brand{width:224px;flex:0 0 224px;display:flex;align-items:center;gap:10px;color:#fff}.site-brand .image-logo{max-width:90px}.site-brand .image-logo img{max-height:36px}.brand-words{display:flex;flex-direction:column;line-height:1.25;white-space:nowrap}.brand-words strong{font-size:16px}.brand-words small{font-size:9px;color:#9098A3;letter-spacing:.03em}.desktop-nav{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);min-width:0}.desktop-nav a{font-size:14px;white-space:nowrap;color:#C7CDD5;border-bottom:2px solid transparent;padding:9px 0}.desktop-nav a.active{color:#6EA8FF;border-color:#6EA8FF}.entry-button{background:#5C7CFA;color:#fff!important;display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 20px;white-space:nowrap;border-radius:999px;font-size:14px;font-weight:700;flex-shrink:0}.entry-button:hover{background:#7390FF}.menu-toggle{display:none;width:40px;height:40px;background:none;border:1px solid #343a46;border-radius:10px;padding:10px}.menu-toggle span{display:block;height:2px;background:#F5F7FA;margin:4px 0}.topic-strip{background:#10141A;border-bottom:1px solid rgba(255,255,255,.09)}.topic-inner{min-height:44px;display:flex;align-items:center;gap:28px;overflow-x:auto;scrollbar-width:none;white-space:nowrap}.topic-inner::-webkit-scrollbar{display:none}.topic-inner a{font-size:13px;color:#C7CDD5;flex-shrink:0}.topic-inner a:hover{color:#6EA8FF}.page-main{padding-top:29px;padding-bottom:70px}.breadcrumbs{display:flex;gap:10px;align-items:center;flex-wrap:wrap;color:#9098A3;font-size:13px;margin-bottom:22px}.breadcrumbs a{color:#C7CDD5}.page-intro{max-width:865px;margin-bottom:38px}.eyebrow{color:#8ED8FF;font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700;margin-bottom:12px}.lead{font-size:17px;line-height:1.85;color:#C7CDD5;max-width:810px}.reading-layout{display:grid;grid-template-columns:minmax(0,820px) minmax(180px,1fr);gap:40px}.prose{min-width:0;max-width:820px}.essay-section{padding:24px 0 30px;border-bottom:1px solid rgba(255,255,255,.09)}.essay-section:first-child{padding-top:0}.essay-section p{max-width:790px}.side-index{align-self:start;position:sticky;top:18px;padding:22px;background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:12px}.side-index h2{font-size:17px}.side-index a{display:block;font-size:14px;margin:9px 0;color:#C7CDD5}.read-next{background:#12161C;border:1px solid rgba(255,255,255,.09);padding:24px;border-radius:13px;margin-top:36px}.read-next h2{font-size:21px}.link-cluster{display:flex;gap:10px;flex-wrap:wrap}.link-cluster a,.inline-action{padding:6px 12px;border:1px solid rgba(142,216,255,.28);border-radius:8px;font-size:14px}.tile-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.tile{padding:24px;background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:13px;min-width:0}.tile h3{margin-bottom:12px}.tile p{font-size:15px;margin:0}.tile a{display:inline-block;margin-top:12px}.feature-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:32px}.feature-split .media-block{max-width:100%}.section-block{margin:48px 0 0}.section-kicker{font-size:12px;color:#8ED8FF;letter-spacing:.11em}.image-shell{display:flex;align-items:center;justify-content:center;background:#0D1015;border:1px solid rgba(255,255,255,.09);border-radius:13px;min-width:0;max-width:100%;padding:8px}.image-shell img{width:100%;height:auto;max-width:100%;object-fit:contain;object-position:center center}.image-hero{min-height:170px;max-height:310px}.image-hero img{max-height:300px;width:auto}.image-banner img{max-height:245px;width:auto}.image-regular img{max-height:180px;width:auto}.image-feature img{max-height:245px;width:auto}.image-gallery img{max-height:260px;width:auto}.image-device{width:min(100%,270px);margin:auto}.image-device img{max-height:340px;width:auto}.image-gif img{max-height:175px;width:auto}.image-logo{border:none;background:none;padding:0;flex:0 1 auto;min-height:20px}.image-logo img{width:auto;max-height:36px}.placeholder{min-height:140px;text-align:center;font-size:13px;color:#9098A3}.image-hero.placeholder{min-height:270px}.image-device.placeholder{min-height:260px}.image-gif.placeholder{min-height:125px}.image-logo.placeholder{min-height:30px;min-width:65px;font-size:9px}.media-block{min-width:0;max-width:100%;margin:0}.media-block figcaption{font-size:13px;line-height:1.65;color:#9098A3;margin:9px 0 0}.home-hero{display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);gap:30px;align-items:center;padding:38px 0 24px}.home-hero h1{font-size:clamp(27px,3.5vw,42px)}.home-hero p{font-size:16px}.home-hero .hero-links{display:flex;gap:20px;flex-wrap:wrap;margin:20px 0}.editorial-columns{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);gap:42px}.numbered-guide{counter-reset:step}.numbered-guide li{margin:0 0 18px;padding-left:8px}.index-items{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 32px}.index-item{padding:15px 0;border-bottom:1px solid rgba(255,255,255,.09)}.index-item strong{display:block;color:#F5F7FA}.image-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.gallery-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.gallery-grid>.media-block:first-child{grid-column:span 2}.gallery-grid>.media-block:first-child img{max-height:320px}.image-grid .media-block,.gallery-grid .media-block{min-width:0}.image-grid .image-shell,.gallery-grid .image-shell{min-height:145px}.table-scroll{overflow-x:auto;max-width:100%}table{width:100%;border-collapse:collapse;font-size:15px;margin:15px 0 25px}td,th{border-bottom:1px solid rgba(255,255,255,.12);padding:13px 15px;text-align:left;vertical-align:top}th{color:#F5F7FA;background:#171C23}details{border-bottom:1px solid rgba(255,255,255,.12);padding:15px 3px}summary{cursor:pointer;color:#F5F7FA;font-weight:700}details p{padding:12px 4px 0;max-width:800px}.note-band{padding:22px 25px;border-left:2px solid #6EA8FF;background:#12161C;margin:28px 0}.site-footer{background:#050608;border-top:1px solid rgba(255,255,255,.09);padding-top:48px}.footer-layout{display:grid;grid-template-columns:1.15fr 1.6fr 1fr;gap:50px}.site-footer h2{font-size:17px;margin:10px 0 12px}.footer-brand{max-width:285px}.footer-brand p{font-size:13px;color:#9098A3}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:3px 14px}.footer-links a{font-size:12px;color:#9098A3}.footer-links a:hover{color:#8ED8FF}.footer-bottom{border-top:1px solid rgba(255,255,255,.09);margin-top:35px;padding:18px 0 24px;color:#9098A3;font-size:12px}.footer-bottom p{margin:4px 0}.drawer,.drawer-overlay{visibility:hidden;pointer-events:none;transition:transform .2s ease,opacity .2s ease,visibility .2s;background:#0D1015}.drawer-overlay{position:fixed;inset:0;z-index:199;background:rgba(0,0,0,.66);opacity:0}.drawer-overlay.is-open{visibility:visible;pointer-events:auto;opacity:1}.drawer{position:fixed;inset:0 auto 0 0;width:min(86vw,340px);max-width:390px;z-index:200;transform:translateX(-102%);overflow-y:auto;padding:18px}.drawer.is-open{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-head{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(255,255,255,.09);padding-bottom:15px}.drawer-head a{display:flex;align-items:center;gap:8px}.drawer-head button{width:40px;height:40px;color:#fff;font-size:26px;background:#171C23;border:0;border-radius:8px}.drawer-group{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.09)}.drawer-group h2{font-size:13px;color:#8ED8FF;margin-bottom:7px}.drawer-group a{display:block;color:#C7CDD5;padding:5px 0;font-size:14px}.back-top{position:fixed;bottom:22px;right:20px;width:42px;height:42px;border-radius:50%;border:1px solid rgba(255,255,255,.18);background:#171C23;color:white;opacity:0;pointer-events:none}.back-top.show{opacity:1;pointer-events:auto}@media(max-width:1099px){.site-brand{flex-basis:182px;width:182px}.brand-words small{display:none}.desktop-nav{gap:12px}.desktop-nav a{font-size:13px}}@media(max-width:979px){.desktop-nav{display:none}.site-header .header-main{height:64px;position:relative}.menu-toggle{display:block;flex-shrink:0}.site-brand{position:absolute;left:50%;transform:translateX(-50%);width:auto;max-width:140px;justify-content:center}.site-brand .brand-words{display:none}.site-brand .image-logo img{max-height:28px}.entry-button{margin-left:auto;height:40px;padding:0 14px;font-size:12px}.topic-inner{gap:20px}.reading-layout{grid-template-columns:minmax(0,1fr)}.side-index{position:static;order:-1}.footer-layout{grid-template-columns:1fr 1.3fr;gap:30px}.footer-layout nav:last-child{grid-column:2}.editorial-columns{gap:22px}}@media(max-width:767px){.wrap{width:calc(100% - 32px)}.page-main{padding-top:22px;padding-bottom:42px}.home-hero{grid-template-columns:minmax(0,1fr);padding-top:15px;gap:16px}.home-hero .media-block{grid-row:1}.home-hero .hero-copy{grid-row:2}.home-hero .image-hero{max-height:205px}.home-hero .image-hero img{max-height:195px}.home-hero h1{font-size:29px}.feature-split,.editorial-columns{grid-template-columns:minmax(0,1fr)}.tile-grid{grid-template-columns:minmax(0,1fr)}.image-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.gallery-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.gallery-grid>.media-block:first-child{grid-column:span 2}.image-banner img{max-height:145px}.image-regular img{max-height:155px}.image-feature img{max-height:185px}.image-gif img{max-height:145px}.image-device{max-width:220px}.section-block{margin-top:34px}.essay-section{padding:18px 0 24px}.footer-layout{grid-template-columns:1fr 1fr;gap:20px}.footer-brand{grid-column:span 2}.footer-layout nav:last-child{grid-column:auto}.footer-links{grid-template-columns:minmax(0,1fr)}.index-items{grid-template-columns:1fr}}@media(max-width:374px){.entry-button{padding:0 10px;font-size:11px}.site-brand{max-width:105px}.site-brand .image-logo{max-width:100px}.image-grid,.gallery-grid{grid-template-columns:minmax(0,1fr)}.gallery-grid>.media-block:first-child{grid-column:span 1}.footer-layout{grid-template-columns:1fr}.footer-brand{grid-column:span 1}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

.mobile-topics{display:none}@media(max-width:979px){.desktop-topics{display:none}.mobile-topics{display:flex}}
