:root{color-scheme:dark;--bg:#080A0D;--surface:#0D1015;--card:#12161C;--muted:#171C23;--hover:#1B2129;--title:#F5F7FA;--text:#C7CDD5;--sub:#9098A3;--blue:#6EA8FF;--line:rgba(255,255,255,.09)}
*{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}img{max-width:100%}a{color:inherit;text-decoration:none}a:hover{color:#8ED8FF}button{font:inherit}a:focus-visible,button:focus-visible{outline:2px solid #8ED8FF;outline-offset:3px}h1,h2,h3{color:var(--title);line-height:1.35;letter-spacing:-.015em}h1{font-size:34px;margin:0 0 18px}h2{font-size:26px;margin:0 0 20px}h3{font-size:20px;margin:0 0 12px}p{margin:0 0 16px}strong{color:#f1f5fa}.container,.container-wide{width:min(100% - 48px,1200px);margin-inline:auto}.container-wide{max-width:1248px}.section{margin:0 auto;padding-block:26px 28px}.section+.section{margin-top:12px}.eyebrow{color:#8ED8FF;text-transform:uppercase;letter-spacing:.13em;font-size:13px;font-weight:700}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:23px}.section-heading p{max-width:620px;color:var(--sub);margin:0}.section-heading h2{margin:0}.text-link{color:#8ED8FF;display:inline-flex;align-items:center;gap:7px;font-weight:600;font-size:14px}.text-link:hover{text-decoration:underline}.text-link::after{content:'›';font-size:20px;line-height:1}.skip-link{position:absolute;z-index:1200;left:16px;top:-100px;background:white;color:black;padding:10px}.skip-link:focus{top:8px}.site-header{height:74px;background:rgba(8,10,13,.96);border-bottom:1px solid var(--line);position:relative;z-index:50}.topbar{height:100%;display:flex;align-items:center;justify-content:space-between;position:relative;gap:12px}.brand{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);height:36px;display:flex;align-items:center;justify-content:center;max-width:calc(100% - 270px)}.brand img{width:auto;max-width:100%;max-height:36px;object-fit:contain}.brand-fallback{color:#f5f7fa;font-size:24px;font-weight:800;white-space:nowrap}.menu-toggle{height:44px;width:44px;border:1px solid var(--line);border-radius:10px;background:var(--card);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;color:var(--title)}.menu-toggle span{height:2px;width:19px;background:currentColor;display:block}.entry-button,.pill{border-radius:999px;padding:0 19px;height:42px;display:inline-flex;align-items:center;justify-content:center;background:#5C7CFA;color:white;white-space:nowrap;font-size:14px;font-weight:700}.entry-button:hover,.pill:hover{background:#6EA8FF;color:#080A0D}.channel-nav{background:#0D1015;border-bottom:1px solid var(--line)}.channel-inner{display:flex;align-items:stretch;justify-content:space-between;overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:thin;height:48px;gap:10px}.channel-inner a{font-size:14px;flex:0 0 auto;white-space:nowrap;padding:10px 14px 8px;border-bottom:2px solid transparent;color:var(--text)}.channel-inner a.active,.channel-inner a[aria-current="page"]{color:#6EA8FF;border-color:#6EA8FF}.drawer-backdrop{position:fixed;inset:0;z-index:70;background:rgba(0,0,0,.64);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-backdrop.open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer{position:fixed;inset:0 auto 0 0;width:420px;max-width:100%;z-index:80;background:#0D1015;border-right:1px solid var(--line);transform:translateX(-103%);visibility:hidden;pointer-events:none;transition:transform .24s,visibility .24s;display:flex;flex-direction:column}.site-drawer.open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{padding:20px 22px 16px;display:flex;justify-content:space-between;align-items:start;gap:12px;border-bottom:1px solid var(--line)}.drawer-brand{display:flex;flex-direction:column;gap:7px}.drawer-brand img{max-height:32px;max-width:160px;object-fit:contain}.drawer-brand small{color:var(--sub);font-size:12px}.drawer-close{height:37px;width:37px;border-radius:9px;background:var(--card);color:white;border:1px solid var(--line);font-size:26px;cursor:pointer}.drawer-scroll{overflow-y:auto;padding:15px 20px 35px;overscroll-behavior:contain}.drawer-group{margin-bottom:21px}.drawer-group h3{font-size:13px;color:#9098A3;margin:0 0 7px;letter-spacing:.04em}.drawer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}.drawer-links a{display:block;padding:7px 11px;font-size:14px;border-left:2px solid transparent;border-radius:5px}.drawer-links a:hover{background:var(--hover)}.drawer-links a.active{color:#6EA8FF;border-left-color:#6EA8FF;background:#171C23}.hero{padding:48px 0 30px;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:36px;align-items:center}.hero h1{font-size:40px;max-width:680px;margin:13px 0 20px}.hero p{max-width:600px}.hero-actions{display:flex;gap:22px;flex-wrap:wrap;margin-top:23px}.media{width:100%;min-width:0;max-width:100%;background:#0D1015;border:1px solid var(--line);border-radius:14px;overflow:hidden;display:flex;align-items:center;justify-content:center;aspect-ratio:16/9}.media img{width:100%;height:100%;max-width:100%;object-fit:contain;object-position:center center;display:block}.media-placeholder{background:linear-gradient(135deg,#11161e,#0D1015 60%,#171c25)}.media-square{aspect-ratio:1/1}.media-wide{aspect-ratio:16/9}.media-banner{aspect-ratio:16/7}.media-device{aspect-ratio:9/16}.hero .media{height:300px;aspect-ratio:auto}.image-card .media{height:165px;aspect-ratio:auto}.image-card{min-width:0}.image-card .card-body{padding:15px 3px 0}.image-card h3{font-size:18px;margin:0 0 9px}.image-card p{font-size:14px;color:var(--sub);line-height:1.7}.grid{display:grid;gap:20px;min-width:0}.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.info-card{padding:22px;border-radius:13px;background:var(--card);border:1px solid var(--line);min-width:0}.info-card h3{font-size:18px}.info-card p{font-size:15px;color:var(--sub);margin-bottom:12px}.number{color:#6EA8FF;font-size:13px;font-weight:700;letter-spacing:.08em}.split{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:28px;align-items:start;min-width:0}.split.reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}.split>*{min-width:0}.editorial-panel{padding:28px;background:var(--card);border:1px solid var(--line);border-radius:14px}.editorial-panel p:last-child,.article-section p:last-child{margin-bottom:0}.index-list{list-style:none;margin:0;padding:0;display:grid;gap:0}.index-list li{display:grid;grid-template-columns:38px minmax(0,1fr);gap:10px;padding:16px 0;border-bottom:1px solid var(--line)}.index-list li:first-child{padding-top:0}.index-list li:last-child{border-bottom:0}.index-list strong{display:block;font-size:17px;margin-bottom:4px}.index-list p{font-size:14px;color:var(--sub);margin:0 0 5px}.mini-links{display:grid;gap:0}.mini-links a{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--line)}.mini-links a:after{content:'↗';color:#6EA8FF}.banner .media{height:240px;aspect-ratio:auto}.device .media{height:350px;max-width:300px;margin-inline:auto;aspect-ratio:auto}.gif-block .media{height:155px;aspect-ratio:auto}.page-hero{padding:42px 0 24px;border-bottom:1px solid var(--line)}.page-hero h1{max-width:900px}.page-hero p{max-width:820px;font-size:17px;color:var(--sub)}.breadcrumb{font-size:13px;color:var(--sub);margin-bottom:14px}.breadcrumb a{color:var(--blue)}.page-layout{display:grid;grid-template-columns:minmax(0,820px) minmax(220px,1fr);gap:40px;padding-top:32px;padding-bottom:35px}.article{min-width:0;max-width:820px}.article-section{margin-bottom:32px}.article-section h2{padding-bottom:11px;border-bottom:1px solid var(--line);margin-bottom:17px}.article-section p{line-height:1.92}.article-section .media{margin:20px 0;max-height:290px}.article-aside{min-width:0}.aside-box{background:var(--card);padding:22px;border:1px solid var(--line);border-radius:13px;margin-bottom:20px}.aside-box h2{font-size:19px}.aside-box p{font-size:14px;color:var(--sub)}.related{border-top:1px solid var(--line);padding-top:26px;margin:24px 0 0}.related h2{font-size:22px}.related-links{display:flex;flex-wrap:wrap;gap:10px 24px}.faq details{border-bottom:1px solid var(--line);padding:16px 0}.faq summary{font-size:18px;font-weight:700;color:var(--title);cursor:pointer}.faq details p{margin:11px 0 0}.compact-articles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.compact-articles article{border:1px solid var(--line);border-radius:12px;padding:21px;background:var(--card)}.compact-articles h2{font-size:20px}.compact-articles p{font-size:15px;color:var(--text)}.page-gallery .media{height:190px;aspect-ratio:auto}.gallery-feature .media{height:240px}.note{font-size:14px;color:var(--sub);border-left:2px solid #6EA8FF;padding:8px 0 8px 16px}.site-footer{background:#050608;border-top:1px solid var(--line);margin-top:36px;padding:48px 0 20px}.footer-grid{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:35px}.footer-grid h2{font-size:17px;margin-bottom:12px}.footer-grid a:not(.footer-logo){display:block;font-size:14px;margin:0 0 8px;color:var(--text)}.footer-grid a:hover{color:#8ED8FF}.footer-brand img{max-height:36px;width:auto;object-fit:contain}.footer-brand p{max-width:280px;color:var(--sub);font-size:14px;margin-top:14px}.footer-logo{font-size:23px;font-weight:800}.footer-bottom{border-top:1px solid var(--line);padding-top:18px;margin-top:32px;display:flex;justify-content:space-between;gap:20px;font-size:13px;color:var(--sub)}.footer-bottom p{margin:0}.back-to-top{position:fixed;right:22px;bottom:22px;width:42px;height:42px;border:1px solid var(--line);border-radius:50%;background:#1B2129;color:white;cursor:pointer;z-index:40;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s}.back-to-top.visible{opacity:1;visibility:visible;pointer-events:auto}
@media(max-width:1100px){.cols-4{grid-template-columns:repeat(2,minmax(0,1fr))}.page-layout{grid-template-columns:minmax(0,1fr) 245px;gap:25px}.channel-inner{justify-content:flex-start}}
@media(max-width:800px){.container,.container-wide{width:calc(100% - 40px)}.hero{grid-template-columns:1fr}.hero .media{order:-1;height:255px}.split,.split.reverse,.page-layout{grid-template-columns:1fr}.article-aside{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.aside-box{margin:0}.cols-3{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{flex-direction:column;gap:7px}.banner .media{height:185px}}
@media(max-width:600px){body{font-size:15px}.container,.container-wide{width:calc(100% - 32px)}.site-header{height:62px}.menu-toggle{width:40px;height:40px;gap:4px}.brand{height:28px;max-width:calc(100% - 192px)}.brand img{max-height:28px}.brand-fallback{font-size:17px}.entry-button{height:38px;padding:0 10px;font-size:12px}.channel-inner{height:44px;gap:0}.channel-inner a{padding:9px 13px 7px;font-size:13px}.site-drawer{width:min(86vw,340px)}.drawer-head{padding:16px}.drawer-scroll{padding:16px}.hero{padding:28px 0 12px;gap:22px}.hero .media{height:195px}.hero h1{font-size:29px}.hero-actions{gap:17px}.page-hero{padding:28px 0 22px}.page-hero h1{font-size:26px}.page-hero p{font-size:15px}h2{font-size:22px}h3{font-size:18px}.section{padding-block:18px}.section+.section{margin-top:7px}.section-heading{align-items:start;flex-direction:column;gap:7px}.cols-2,.cols-3,.cols-4{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.info-card{padding:15px}.info-card h3{font-size:16px}.info-card p{font-size:13px}.editorial-panel{padding:20px}.image-card .media{height:135px}.image-card h3{font-size:16px}.image-card p{font-size:13px}.index-list li{grid-template-columns:28px minmax(0,1fr)}.banner .media{height:140px}.device .media{height:330px}.gif-block .media{height:120px}.article-aside{grid-template-columns:1fr}.compact-articles{grid-template-columns:1fr}.page-gallery .media{height:155px}.footer-grid{gap:22px}.site-footer{padding-top:35px}.footer-grid h2{font-size:16px}.footer-grid a:not(.footer-logo){font-size:13px}}
@media(max-width:350px){.brand{max-width:calc(100% - 174px)}.brand-fallback{font-size:15px}.entry-button{padding:0 7px;font-size:11px}.cols-2.info-grid,.cols-3.info-grid{grid-template-columns:1fr}.drawer-links{grid-template-columns:1fr}.image-card .media{height:125px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.site-drawer,.drawer-backdrop,.back-to-top{transition:none}}