:root{--bg:#080A0D;--panel:#0D1015;--card:#12161C;--sub:#171C23;--hover:#1B2129;--text:#C7CDD5;--muted:#9098A3;--title:#F5F7FA;--blue:#6EA8FF;--brand:#5C7CFA;--border:rgba(255,255,255,.09);--line:rgba(255,255,255,.16)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}body,html{min-width:0}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--blue);outline-offset:4px}img{display:block;max-width:100%;height:auto}button{font:inherit;cursor:pointer}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--title);line-height:1.35;letter-spacing:-.025em}h1{font-size:34px}h2{font-size:26px}h3{font-size:20px}p{margin-bottom:16px}.container{width:min(100% - 48px,1200px);margin-inline:auto}.skip-link{position:fixed;top:-80px;left:16px;z-index:200;padding:8px 16px;background:var(--blue);color:#080A0D}.skip-link:focus{top:8px}
.site-topbar{height:74px;background:rgba(8,10,13,.96);border-bottom:1px solid var(--border);position:relative;z-index:40}.topbar-inner{height:100%;width:min(100% - 48px,1200px);margin:auto;display:flex;align-items:center;justify-content:space-between;position:relative;gap:12px}.icon-button{display:grid;place-items:center;width:44px;height:44px;flex:0 0 auto;background:var(--card);border:1px solid var(--border);border-radius:10px;color:var(--title);padding:0}.icon-button:hover{background:var(--hover)}.burger{display:grid;gap:5px}.burger i{display:block;width:19px;height:2px;border-radius:2px;background:var(--title)}.top-logo{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);max-width:calc(100% - 252px);display:flex;align-items:center;justify-content:center}.top-logo img{height:36px;width:auto;max-width:100%;object-fit:contain}.wordmark{font-weight:800;font-size:22px;white-space:nowrap;color:#EAF0FF;letter-spacing:.04em}.wordmark span{color:var(--blue)}.entry-link{margin-left:auto;background:var(--brand);color:white;border-radius:999px;font-size:14px;font-weight:bold;line-height:42px;height:42px;padding:0 23px;white-space:nowrap}.entry-link:hover{background:var(--blue);color:#080A0D}.channel-nav{height:48px;background:#0D1015;border-bottom:1px solid var(--border);overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;scrollbar-color:#3B4554 transparent}.channel-track{width:min(100% - 48px,1200px);min-width:max-content;height:100%;margin:auto;display:flex;justify-content:space-between;gap:24px;align-items:stretch}.channel-track a{position:relative;display:grid;align-items:center;white-space:nowrap;font-size:14px;color:var(--text);padding:0 3px}.channel-track a.active{color:var(--blue)}.channel-track a.active:after{content:"";position:absolute;height:2px;background:var(--blue);bottom:0;left:0;right:0}.channel-track a:hover{color:var(--blue)}
.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,.73);z-index:80;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.site-drawer{position:fixed;top:0;bottom:0;left:0;width:420px;max-width:86vw;background:var(--panel);z-index:90;transform:translateX(-103%);visibility:hidden;pointer-events:none;transition:transform .22s,visibility .22s;box-shadow:8px 0 36px #0007;display:flex;flex-direction:column}.drawer-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{padding:26px 24px 20px;display:flex;justify-content:space-between;gap:12px;border-bottom:1px solid var(--border)}.drawer-brand{min-width:0}.drawer-brand img{height:34px;width:auto;max-width:100%;object-fit:contain;object-position:left}.drawer-brand p{font-size:13px;color:var(--muted);margin:9px 0 0}.drawer-close{font-size:30px;font-weight:300;line-height:1}.drawer-scroll{overflow-y:auto;overscroll-behavior:contain;padding:10px 24px 35px}.drawer-group{padding:14px 0;border-bottom:1px solid var(--border)}.drawer-group h2{font-size:13px;letter-spacing:.08em;color:var(--muted);margin:0 0 10px}.drawer-links{display:grid;grid-template-columns:1fr 1fr;gap:4px 10px}.drawer-links a{font-size:14px;padding:8px 9px;border-left:2px solid transparent;line-height:1.4;border-radius:3px}.drawer-links a.active{color:var(--blue);border-left-color:var(--blue);background:var(--card)}.drawer-links a:hover{background:var(--hover)}
main{min-height:55vh}.eyebrow{text-transform:uppercase;font-weight:700;font-size:12px;letter-spacing:.15em;color:var(--blue);margin-bottom:12px}.hero{padding:58px 0 46px;background:radial-gradient(ellipse at 85% 0,rgba(61,105,183,.13),transparent 50%)}.hero-grid{display:grid;grid-template-columns:minmax(0,56fr) minmax(0,44fr);gap:34px;align-items:center}.hero-text{min-width:0}.hero h1{font-size:40px;max-width:720px;line-height:1.28}.hero .lead{font-size:16px;max-width:630px;color:var(--text)}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:23px}.text-action{color:var(--blue);border-bottom:1px solid rgba(110,168,255,.5);padding:3px 0;font-weight:700;font-size:14px}.text-action:hover{color:#A8D5FF}.media{width:100%;max-width:100%;min-width:0;overflow:hidden;background:var(--panel);border:1px solid var(--border);border-radius:14px;display:flex;align-items:center;justify-content:center}.media img{width:100%;height:100%;display:block;object-fit:contain;object-position:center center;max-width:100%}.media-hero{height:305px}.media-wide{height:240px}.media-card{height:165px}.media-topic{height:235px}.media-banner{height:235px}.media-square{height:190px}.media-device{height:350px;max-width:290px;margin:auto}.media-gif{height:155px}.media-placeholder{background:linear-gradient(135deg,#111722,#0D1015 55%,#161C25);min-height:80px}.placeholder-mark{display:block;width:28%;max-width:90px;aspect-ratio:1;border:1px solid rgba(110,168,255,.16);transform:rotate(45deg);border-radius:16px;opacity:.44}
.section{padding:48px 0}.section + .section{border-top:1px solid rgba(255,255,255,.035)}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:22px}.section-head h2{margin:0}.section-head p{font-size:14px;color:var(--muted);margin:6px 0 0}.subtle-link{font-size:14px;color:var(--blue);white-space:nowrap}.grid{display:grid;gap:20px;min-width:0}.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))}.grid-6{grid-template-columns:repeat(3,minmax(0,1fr))}.topic-card{background:var(--card);border:1px solid var(--border);border-radius:13px;padding:21px;min-width:0}.topic-card h3{font-size:18px;margin:0 0 9px}.topic-card p{font-size:14px;color:var(--text);line-height:1.75;margin:0 0 12px}.topic-card .small-index{color:var(--blue);font-size:12px;font-weight:bold;letter-spacing:.13em}.topic-card .inline-link{font-size:14px;color:var(--blue)}.topic-card:hover{border-color:var(--line)}.visual-card{min-width:0}.visual-card h3{font-size:17px;margin:12px 0 7px}.visual-card p{font-size:14px;color:var(--muted);line-height:1.7;margin:0}.split{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:32px;align-items:start}.split.equal{grid-template-columns:repeat(2,minmax(0,1fr))}.split.reverse-media{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);align-items:center}.prose{max-width:820px}.prose p{line-height:1.85}.feature-panel{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:26px}.feature-panel h3{margin-bottom:12px}.link-stack{display:grid;gap:8px}.link-stack a{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid var(--border);font-size:15px}.link-stack a:after{content:'↗';color:var(--blue)}.number-list{list-style:none;margin:0;padding:0;counter-reset:item}.number-list li{counter-increment:item;display:grid;grid-template-columns:44px 1fr;gap:12px;padding:17px 0;border-bottom:1px solid var(--border)}.number-list li:before{content:counter(item,decimal-leading-zero);color:var(--blue);font-weight:bold;font-size:14px}.number-list strong{display:block;color:var(--title);font-size:17px}.number-list p{margin:5px 0 0;font-size:14px}.notice-strip{border-left:2px solid var(--blue);background:var(--panel);padding:16px 20px;font-size:14px;color:var(--muted)}.image-text{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);align-items:center;gap:30px}.bullet-links{display:flex;gap:13px;flex-wrap:wrap;margin-top:15px}.bullet-links a{font-size:14px;color:var(--blue);border-bottom:1px solid var(--border)}
.page-intro{padding:56px 0 35px;background:radial-gradient(ellipse at 90% 0,rgba(60,91,148,.12),transparent 48%);border-bottom:1px solid var(--border)}.page-intro h1{max-width:900px;margin-bottom:14px}.page-intro p{max-width:830px;color:var(--text);font-size:16px}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:22px}.breadcrumbs a{color:var(--blue)}.article-layout{display:grid;grid-template-columns:minmax(0,820px) minmax(220px,1fr);align-items:start;gap:36px;padding:40px 0 20px}.article-body{min-width:0}.article-body section{margin-bottom:36px}.article-body h2{font-size:26px;margin-bottom:14px;padding-left:15px;border-left:3px solid var(--blue)}.article-body h3{margin:20px 0 9px}.article-body p{color:var(--text)}.article-body ul,.article-body ol{padding-left:22px}.article-body li{margin-bottom:9px}.side-panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:22px;position:sticky;top:20px}.side-panel h2{font-size:18px;margin:0 0 14px}.side-panel p{font-size:14px;color:var(--muted)}.side-panel .link-stack a{font-size:14px}.reading-links{padding:28px 0 46px;margin-top:12px;border-top:1px solid var(--border)}.reading-links h2{font-size:22px}.reading-links-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-link{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;border-radius:9px;background:var(--panel);border:1px solid var(--border);font-size:14px}.related-link span{color:var(--blue)}.article-media{margin:15px 0 25px}.article-media .media{max-width:730px}.rule-note{background:var(--panel);border:1px solid var(--border);border-left:3px solid var(--blue);border-radius:9px;padding:18px 20px;margin:20px 0;font-size:14px}.faq-list details{border:1px solid var(--border);background:var(--card);border-radius:11px;margin-bottom:11px;padding:0 19px}.faq-list summary{cursor:pointer;color:var(--title);font-weight:bold;padding:16px 0}.faq-list details p{margin:0;padding:0 0 18px;font-size:15px}.announcement-card{padding:20px;background:var(--card);border:1px solid var(--border);border-radius:12px}.announcement-card h3{font-size:18px}.announcement-card p{font-size:14px}
.site-footer{background:#050608;border-top:1px solid var(--border);margin-top:10px;padding:45px 0 22px}.footer-cols{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:32px}.footer-brand p{color:var(--muted);font-size:14px;margin-top:15px}.footer-brand img{height:34px;width:auto;object-fit:contain;object-position:left}.footer-col{display:flex;flex-direction:column;gap:7px}.footer-col h2{font-size:16px;margin:0 0 10px}.footer-col a{font-size:14px;color:var(--muted)}.footer-col a:hover{color:var(--blue)}.footer-bottom{border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:16px;padding-top:22px;margin-top:35px;color:var(--muted);font-size:13px}.back-to-top{position:fixed;right:20px;bottom:22px;width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--title);z-index:25;visibility:hidden;opacity:0;pointer-events:none;transition:opacity .2s,visibility .2s}.back-to-top.visible{visibility:visible;opacity:1;pointer-events:auto}
@media(max-width:1050px){.container,.topbar-inner{width:min(100% - 40px,1200px)}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-grid{gap:24px}.article-layout{grid-template-columns:minmax(0,1fr) 240px;gap:24px}}
@media(max-width:800px){.hero{padding:36px 0}.hero-grid{display:flex;flex-direction:column-reverse;align-items:stretch}.hero-grid .media-hero{height:260px}.split,.split.equal,.split.reverse-media,.image-text,.article-layout{grid-template-columns:1fr}.side-panel{position:static}.grid-3,.grid-6{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}.section{padding:36px 0}.page-intro{padding:38px 0 28px}.reading-links-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.image-text .media-device{max-width:240px}.article-layout{padding-top:30px}.media-wide{height:220px}}
@media(max-width:600px){body{font-size:15px}.container,.topbar-inner{width:calc(100% - 32px)}.site-topbar{height:62px}.topbar-inner{gap:6px}.icon-button{height:40px;width:40px}.top-logo{max-width:calc(100% - 181px)}.top-logo img{height:28px}.wordmark{font-size:17px}.entry-link{height:38px;line-height:38px;padding:0 12px;font-size:12px}.channel-nav{height:44px}.channel-track{width:max-content;gap:23px;padding:0 16px}.channel-track a{font-size:13px}.site-drawer{width:min(86vw,340px)}.drawer-head{padding:20px 16px}.drawer-scroll{padding-inline:16px}.drawer-brand img{max-height:28px}.hero{padding:25px 0 32px}.hero-grid{gap:20px}.hero h1{font-size:29px}.hero .lead{font-size:15px}.hero-grid .media-hero{height:195px}.hero-actions{margin-top:15px}.section{padding:32px 0}.section-head h2,.article-body h2{font-size:22px}.section-head{align-items:flex-start;gap:12px}.section-head .subtle-link{margin-top:7px}.grid{gap:14px}.topic-card{padding:16px}.topic-card h3{font-size:16px}.topic-card p{font-size:13px}.visual-card h3{font-size:16px}.visual-card p{font-size:13px}.media-card{height:140px}.media-square{height:145px}.media-topic{height:170px}.media-wide{height:175px}.media-banner{height:140px}.media-gif{height:130px}.media-device{height:350px}.feature-panel{padding:19px}.page-intro{padding:32px 0 26px}.page-intro h1{font-size:26px}.page-intro p{font-size:15px}.article-layout{gap:19px}.article-body section{margin-bottom:28px}.reading-links-grid{grid-template-columns:1fr}.footer-cols{gap:28px 18px}.footer-bottom{flex-direction:column}.site-footer{padding-top:36px}.footer-brand p{font-size:13px}}
@media(max-width:350px){.top-logo{max-width:calc(100% - 170px)}.entry-link{font-size:11px;padding:0 9px}.grid-6{grid-template-columns:1fr}.topic-card{padding:14px}.media-card{height:126px}.hero-grid .media-hero{height:175px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}