*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:#C7CDD5;background:#080A0D;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}button,a{ -webkit-tap-highlight-color:transparent}a{color:#8ED8FF;text-decoration:none}a:hover{color:#fff}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:#F5F7FA;line-height:1.4}h1{font-size:clamp(28px,3vw,42px)}h2{font-size:26px}h3{font-size:19px}p{margin-bottom:16px}small,.eyebrow{color:#8ED8FF;font-size:13px;letter-spacing:.08em}.shell{width:calc(100% - 48px);max-width:1200px;margin-inline:auto}.site-header{background:rgba(8,10,13,.96);border-bottom:1px solid rgba(255,255,255,.09);position:relative;z-index:20}.topbar{height:74px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}.menu-toggle{justify-self:start;width:44px;height:44px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;background:#12161C;border:1px solid rgba(255,255,255,.16);border-radius:11px;cursor:pointer}.menu-toggle span{width:20px;height:2px;background:#F5F7FA;border-radius:2px}.brand{justify-self:center;display:flex;align-items:center;justify-content:center;min-width:0;white-space:nowrap;color:#fff;font-size:23px;line-height:1}.brand span{color:#6EA8FF}.brand img{height:36px;max-width:155px;width:auto;object-fit:contain}.enter{justify-self:end;background:#5C7CFA;color:white;border-radius:999px;padding:0 19px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;font-weight:700;font-size:14px}.enter:hover{background:#7390FF;color:#fff}.channels{background:#0D1015}.channel-inner{display:flex;align-items:center;gap:25px;overflow-x:auto;scrollbar-width:thin;white-space:nowrap;height:46px}.channels a{display:inline-flex;align-items:center;align-self:stretch;flex:none;font-size:14px;color:#C7CDD5;border-bottom:2px solid transparent}.channels a.active,.channels a:hover{color:#6EA8FF;border-bottom-color:#6EA8FF}.drawer-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.62);z-index:30;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .2s,visibility .2s}.drawer{position:fixed;left:0;top:0;height:100dvh;width:420px;max-width:86vw;background:#0D1015;z-index:31;transform:translateX(-101%);visibility:hidden;pointer-events:none;transition:transform .24s,visibility .24s;overflow-y:auto;padding:18px 22px 32px}.drawer-open .drawer,.drawer-open .drawer-backdrop{visibility:visible;pointer-events:auto}.drawer-open .drawer{transform:translateX(0)}.drawer-open .drawer-backdrop{opacity:1}.drawer-open{overflow:hidden}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.09)}.drawer-title{color:#fff;font-weight:700}.drawer-close{border:1px solid #303946;background:#171C23;color:#fff;border-radius:8px;width:40px;height:40px;font-size:26px;cursor:pointer}.drawer-group{padding:16px 0;border-bottom:1px solid rgba(255,255,255,.09);display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 12px}.drawer-group h2{grid-column:1/-1;font-size:15px;margin:0 0 6px;color:#8ED8FF}.drawer-group a{color:#C7CDD5;font-size:14px;padding:6px;border-left:2px solid transparent}.drawer-group a.active{color:#6EA8FF;border-left-color:#6EA8FF}.hero{display:grid;grid-template-columns:54fr 46fr;gap:32px;align-items:center;padding:38px 0 28px}.hero .media{height:310px}.hero-intro{font-size:17px}.inline-links{display:flex;flex-wrap:wrap;gap:14px;margin-top:15px}.inline-links a{border-bottom:1px solid rgba(142,216,255,.4);font-weight:600}.section{padding:34px 0;border-top:1px solid rgba(255,255,255,.09)}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px}.section-head h2{margin:0}.panel,.tile,.article-card{background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:13px;padding:22px;min-width:0}.panel h3,.tile h3,.article-card h3{margin-bottom:9px}.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.feature-split{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(230px,1fr);gap:22px}.text-list{padding:0;margin:0;list-style:none;counter-reset:item}.text-list li{padding:16px 0;border-bottom:1px solid rgba(255,255,255,.09);counter-increment:item}.text-list li::before{content:counter(item,decimal-leading-zero);display:inline-block;width:38px;color:#6EA8FF;font-weight:bold}.text-list a{font-weight:700}.text-list p{margin:3px 0 0 38px;font-size:14px}.media{width:100%;position:relative;overflow:hidden;border-radius:13px;background:#0D1015;border:1px solid rgba(255,255,255,.07)}.media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center;display:block}.media-placeholder{width:100%;height:100%;background:linear-gradient(135deg,#0D1015,#171C23)}.media-square{aspect-ratio:1/1}.media-wide{aspect-ratio:16/9}.media-banner{aspect-ratio:16/7}.media-device{aspect-ratio:9/16}.image-card .media{height:165px;aspect-ratio:auto}.image-card{min-width:0}.image-card h3{font-size:17px;margin:13px 0 5px}.image-card p{font-size:14px;margin:0}.banner .media{max-height:260px}.topic-hero{padding:38px 0 20px;max-width:920px}.topic-hero h1{font-size:35px;margin-bottom:13px}.topic-hero p{font-size:17px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:34px}.prose{max-width:850px}.prose h2{font-size:25px;margin:28px 0 12px}.prose p{line-height:1.85}.article-layout .aside{align-self:start;position:sticky;top:15px}.aside a{display:block;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.09)}.related{padding:30px 0 46px;border-top:1px solid rgba(255,255,255,.09)}.related-links{display:flex;gap:10px;flex-wrap:wrap}.related-links a{padding:7px 12px;border:1px solid rgba(110,168,255,.35);border-radius:8px}.note{border-left:3px solid #6EA8FF;padding:15px 18px;background:#12161C;border-radius:0 10px 10px 0}.faq-item{padding:18px 0;border-bottom:1px solid rgba(255,255,255,.09)}.faq-item h2{font-size:19px}.footer{background:#050608;border-top:1px solid rgba(255,255,255,.09);padding:44px 0 24px}.footer-grid{display:grid;grid-template-columns:1.45fr repeat(3,1fr);gap:32px}.footer h2{font-size:16px}.footer a:not(.footer-logo){display:block;color:#C7CDD5;font-size:14px;padding:2px 0}.footer a:hover{color:#8ED8FF}.footer-logo{display:inline-flex;color:#fff;font-weight:bold;font-size:24px;margin-bottom:12px}.footer-logo img{height:36px;width:auto;max-width:155px;object-fit:contain}.footer p{font-size:14px;color:#9098A3}.footer-bottom{border-top:1px solid rgba(255,255,255,.09);margin-top:24px;padding-top:20px;font-size:13px}.footer-bottom p{margin:3px 0}.backtop{position:fixed;bottom:20px;right:20px;width:42px;height:42px;border-radius:50%;border:1px solid #445b85;background:#171C23;color:#fff;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;z-index:10}.backtop.visible{opacity:1;visibility:visible}@media(max-width:980px){.shell{width:calc(100% - 40px)}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.shell{width:calc(100% - 32px)}.topbar{height:64px}.menu-toggle{width:40px;height:40px}.brand img{height:28px;max-width:110px}.brand{font-size:19px}.enter{min-height:40px;padding:0 11px;font-size:12px}.channel-inner{gap:19px}.hero{grid-template-columns:1fr;gap:15px;padding:23px 0}.hero .media{grid-row:1;height:205px}.hero h1{font-size:30px}.topic-hero{padding:26px 0 15px}.topic-hero h1{font-size:27px}.topic-hero p{font-size:16px}.grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.grid-2,.feature-split,.article-layout{grid-template-columns:1fr}.section{padding:27px 0}.panel,.tile,.article-card{padding:16px}.image-card .media{height:145px}.image-card h3{font-size:16px}.article-layout .aside{position:static}.footer-grid{gap:25px}.footer{padding-top:30px}.banner .media{max-height:145px}h2{font-size:21px}.prose h2{font-size:21px}}@media(max-width:355px){.brand img{max-width:86px}.brand{font-size:16px}.enter{font-size:11px;padding:0 9px}.grid-3,.grid-4{grid-template-columns:1fr}.image-card .media{height:160px}}