:root{color-scheme:dark;--bg:#080a0d;--panel:#0d1015;--panel2:#12161c;--panel3:#171c23;--text:#f5f7fa;--body:#c7cdd5;--muted:#9098a3;--blue:#5c7cfa;--bright:#6ea8ff;--border:rgba(255,255,255,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.8}a{color:inherit;text-decoration:none}a:hover{color:var(--bright)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid #8ed8ff;outline-offset:4px}button{font:inherit;cursor:pointer}.container{width:min(100% - 48px,1200px);margin-inline:auto}.skip-link{position:absolute;top:-60px;left:12px;z-index:999;background:var(--blue);padding:8px 18px;color:#fff}.skip-link:focus{top:8px}.site-header{position:relative;z-index:20}.topbar{background:rgba(8,10,13,.96);border-bottom:1px solid var(--border)}.topbar-inner{width:min(100% - 48px,1200px);margin:auto;min-height:76px;display:flex;gap:18px;align-items:center}.brand{display:flex;flex-direction:column;flex:0 0 214px;min-width:0;gap:0}.logo-media{margin:0;display:flex;align-items:center;min-height:24px;max-width:100%;border:none}.logo-media img{display:block;max-width:100%;max-height:36px;width:auto;height:auto;object-fit:contain}.logo-media .media-placeholder{min-height:32px;width:112px}.brand-caption{font-size:9px;letter-spacing:.11em;line-height:1.2;color:var(--muted);margin-top:1px}.desktop-nav{display:flex;flex:1;justify-content:center;align-items:center;gap:clamp(9px,1.35vw,24px);white-space:nowrap}.desktop-nav a{font-size:14px;position:relative;padding:26px 0 22px;color:#c7cdd5}.desktop-nav a.is-active{color:var(--bright)}.desktop-nav a.is-active:after{position:absolute;bottom:13px;left:0;right:0;content:'';height:2px;background:var(--bright)}.enter-link{white-space:nowrap;background:var(--blue);color:#fff!important;border-radius:999px;padding:8px 19px;font-size:14px;font-weight:bold;display:flex;align-items:center;justify-content:center;min-height:42px}.enter-link:hover{background:#7390ff}.quick-strip{background:#10141a;border-bottom:1px solid var(--border)}.quick-inner{width:min(100% - 48px,1200px);margin:auto}.desktop-quick{height:44px;display:flex;align-items:center;gap:34px}.desktop-quick a{font-size:13px;color:#aeb8c6}.desktop-quick a:hover{color:var(--bright)}.mobile-quick,.menu-toggle{display:none}.breadcrumb{font-size:13px;display:flex;flex-wrap:wrap;gap:11px;color:var(--muted);padding-top:24px}.breadcrumb a{color:#c7cdd5}.page-header{padding:35px 0 30px;border-bottom:1px solid var(--border);margin-bottom:30px}.eyebrow,.section-kicker{font-size:11px;color:var(--bright);letter-spacing:.16em;font-weight:700;line-height:1.6}.page-header h1,.home-hero h1{color:var(--text);font-size:clamp(32px,3vw,35px);line-height:1.35;letter-spacing:-.025em;margin:12px 0 18px;font-weight:750}.page-header p{max-width:790px;font-size:17px;line-height:1.85;margin:0}.article-shell{display:grid;grid-template-columns:minmax(0,820px) minmax(0,1fr);gap:60px;align-items:start;padding-bottom:70px}.article-main{min-width:0}.article-aside{position:sticky;top:28px;border-left:1px solid var(--border);padding-left:24px}.article-aside h2{font-size:14px;margin:0 0 18px;color:var(--text)}.article-aside a{display:block;font-size:13px;padding:7px 0;color:var(--muted)}.article-aside a:hover{color:var(--bright)}.article-section{padding:15px 0 30px;margin-bottom:17px;border-bottom:1px solid var(--border);scroll-margin-top:20px}.article-section h2,.related-links h2,.home-section h2{font-size:26px;line-height:1.4;color:var(--text);margin:10px 0 20px}.article-section p,.home-section p{margin:0 0 17px;line-height:1.85;overflow-wrap:anywhere}.article-section p:last-child{margin-bottom:0}.steps{padding-left:24px}.steps li{padding:7px 0 7px 8px}.table-scroll{max-width:100%;overflow-x:auto;border:1px solid var(--border);border-radius:12px;margin:20px 0}table{width:100%;border-collapse:collapse;min-width:480px;font-size:14px}th,td{text-align:left;padding:12px 14px;vertical-align:top;border-bottom:1px solid var(--border)}th{background:var(--panel3);color:var(--text)}tr:last-child td{border-bottom:0}.media-box{margin:22px 0;background:var(--panel);border:1px solid var(--border);border-radius:13px;padding:12px;max-width:100%;min-width:0}.media-box img{display:block;max-width:100%;width:auto;height:auto;max-height:245px;object-fit:contain;object-position:center;margin:auto}.media-box figcaption{font-size:13px;line-height:1.65;padding:12px 4px 2px;color:var(--muted)}.media-placeholder{height:170px;max-width:100%;border-radius:7px;background:linear-gradient(140deg,#12161c,#1b2129);border:1px dashed rgba(255,255,255,.1)}.related-links{margin-top:35px;padding-top:22px}.related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--border)}.related-item{display:flex;align-items:center;justify-content:space-between;padding:14px 10px;border-bottom:1px solid var(--border);font-size:15px;gap:14px}.related-item span{color:var(--bright)}.site-footer{background:#050608;border-top:1px solid var(--border);padding:48px 0 18px}.footer-layout{display:grid;grid-template-columns:1.5fr 1fr .8fr;gap:65px}.footer-about p{font-size:13px;line-height:1.9;max-width:360px;color:var(--muted)}.footer-about small{font-size:12px;color:var(--muted)}.site-footer h2{font-size:15px;color:var(--text);margin:0 0 18px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 15px}.footer-links a{font-size:13px;padding:3px 0;color:var(--muted)}.footer-bottom{border-top:1px solid var(--border);margin-top:38px;padding-top:15px;font-size:12px;color:var(--muted)}.back-to-top{position:fixed;right:18px;bottom:22px;border:1px solid var(--border);border-radius:100%;background:var(--panel3);width:44px;height:44px;color:#fff;z-index:15;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s}.back-to-top.is-visible{opacity:1;visibility:visible;pointer-events:auto}.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:49;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer{position:fixed;z-index:50;inset:0 auto 0 0;width:min(390px,86vw);overflow-y:auto;background:var(--panel);border-right:1px solid var(--border);padding:18px 22px 30px;transform:translateX(-100%);visibility:hidden;pointer-events:none;transition:transform .22s,visibility .22s}.site-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-open{overflow:hidden}.drawer-head{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);padding-bottom:15px}.drawer-close{background:none;border:0;color:var(--text);font-size:30px;line-height:1;min-width:40px;min-height:40px}.drawer-group{border-bottom:1px solid var(--border);padding:15px 0}.drawer-group h2{color:var(--bright);font-size:12px;letter-spacing:.1em}.drawer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:15px}.drawer-links a{font-size:14px;padding:7px 0}.home-hero{padding:50px 0 54px;display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);gap:35px;align-items:center}.home-hero h1{font-size:clamp(32px,3.5vw,42px)}.home-hero .hero-copy p{font-size:17px;max-width:540px}.hero-actions{display:flex;flex-wrap:wrap;gap:24px;margin-top:23px}.hero-actions a{border-bottom:1px solid var(--bright);color:var(--bright);font-weight:bold;font-size:14px}.hero-media{margin:0;min-width:0;max-width:100%;height:auto;min-height:230px;display:grid;align-content:center;background:var(--panel);border-radius:14px;border:1px solid var(--border);padding:14px}.hero-media img{display:block;max-width:100%;max-height:245px;width:auto;height:auto;object-fit:contain;margin:auto}.hero-media .media-placeholder{min-height:240px}.home-section{padding:46px 0;border-top:1px solid var(--border)}.home-section .section-heading{max-width:800px;margin-bottom:25px}.section-lede{font-size:17px}.interest-grid,.twin-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.interest-card{padding:24px;border:1px solid var(--border);background:var(--panel2);border-radius:13px}.interest-card h3,.twin-grid h3{font-size:20px;color:var(--text);line-height:1.4;margin:0 0 12px}.interest-card p{font-size:15px;margin-bottom:10px}.text-link{color:var(--bright);font-size:14px;font-weight:700}.home-split{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,.8fr);gap:60px;align-items:start}.home-side{border-left:1px solid var(--border);padding-left:24px}.home-side h3{font-size:16px;color:var(--text)}.home-side p{font-size:14px}.twin-grid>article{border-top:2px solid rgba(110,168,255,.5);padding:20px 14px 0 0}.photo-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.photo-grid figure{margin:0;min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:13px;padding:12px}.photo-grid img{width:auto;max-width:100%;height:auto;max-height:170px;object-fit:contain;margin:auto;display:block}.photo-grid figcaption{font-size:13px;line-height:1.65;padding:12px 2px 0;color:var(--muted)}.photo-grid .media-placeholder{height:150px}.photo-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.photo-grid.four img{max-height:150px}.home-feature{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:36px;align-items:center}.home-feature .media-box{margin:0}.home-feature .media-box img{max-height:245px}.home-mobile{grid-template-columns:minmax(0,1.4fr) minmax(0,.6fr)}.home-mobile .media-box img{max-height:340px}.home-mobile .media-box{max-width:270px;margin-inline:auto}.resource-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 30px}.resource-list article{display:grid;grid-template-columns:35px minmax(0,1fr);gap:14px;padding:17px 0;border-bottom:1px solid var(--border)}.resource-list .num{color:var(--bright);font-size:13px}.resource-list h3{margin:0 0 6px;color:var(--text);font-size:17px}.resource-list p{font-size:14px;margin:0}.notice-band{padding:22px 24px;background:var(--panel2);border-left:2px solid var(--bright);font-size:14px}.faq-list details{border-bottom:1px solid var(--border);padding:15px 0}.faq-list summary{cursor:pointer;font-size:17px;color:var(--text);font-weight:bold}.faq-list details p{padding:12px 8px;margin:0}.index-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.index-groups article{background:var(--panel2);border:1px solid var(--border);padding:24px;border-radius:13px;min-width:0}.index-groups h2{font-size:20px;color:var(--text)}.index-groups p{font-size:15px}.index-groups .chip-links{display:flex;flex-wrap:wrap;gap:9px}.chip-links a{font-size:13px;padding:5px 12px;border:1px solid rgba(255,255,255,.16);border-radius:999px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.gallery-grid .media-box{margin:0}.gallery-grid img{max-height:300px}.gallery-grid .media-box:first-child{grid-column:1/-1}.gallery-grid .media-box:first-child img{max-height:245px}.site-map-noscript{padding:14px 18px;background:var(--panel);font-size:13px}.site-map-noscript a{margin-right:15px}
@media(max-width:1100px){.desktop-nav{gap:10px}.brand{flex-basis:185px}.desktop-nav a{font-size:13px}.topbar-inner{gap:12px}.enter-link{padding-inline:15px}}
@media(max-width:979px){.container,.topbar-inner,.quick-inner{width:min(100% - 40px,1200px)}.topbar-inner{height:64px;min-height:64px;position:relative;justify-content:space-between}.desktop-nav,.desktop-quick,.brand-caption{display:none}.menu-toggle{display:flex;width:40px;height:40px;flex-direction:column;gap:5px;justify-content:center;align-items:center;background:none;border:1px solid var(--border);border-radius:9px;color:var(--text);flex:0 0 40px}.menu-toggle span{width:18px;height:2px;border-radius:1px;background:var(--text)}.brand{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:clamp(84px,27vw,135px);flex:none;justify-content:center;align-items:center;pointer-events:auto}.brand .logo-media img{max-height:28px}.brand .logo-media .media-placeholder{width:90px;height:27px;min-height:27px}.enter-link{min-height:38px;font-size:12px;padding:6px 12px;margin-left:auto}.quick-inner{width:100%}.mobile-quick{display:flex;height:43px;align-items:center;gap:26px;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none;padding:0 20px;white-space:nowrap}.mobile-quick::-webkit-scrollbar{display:none}.mobile-quick a{font-size:13px;flex:0 0 auto}.article-shell{grid-template-columns:minmax(0,1fr) 180px;gap:26px}.article-aside{padding-left:16px}.home-split{gap:30px}}
@media(max-width:767px){.container{width:calc(100% - 32px)}.article-shell{display:block}.article-aside{position:static;border-left:0;border-top:1px solid var(--border);padding:22px 0;margin:28px 0}.article-aside .aside-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:16px}.page-header{padding:26px 0 22px}.page-header h1{font-size:26px}.page-header p{font-size:15px}.article-section h2,.related-links h2,.home-section h2{font-size:21px}.article-section p{font-size:15px}.home-hero{display:flex;flex-direction:column-reverse;align-items:stretch;gap:24px;padding:28px 0 34px}.home-hero h1{font-size:29px}.home-hero .hero-copy p{font-size:15px}.hero-media{min-height:170px}.hero-media img{max-height:145px}.hero-media .media-placeholder{min-height:145px}.home-section{padding:30px 0}.home-split,.home-feature,.home-mobile{display:flex;flex-direction:column;gap:18px}.home-side{border-left:0;border-top:1px solid var(--border);padding:12px 0 0}.home-feature .media-box{width:100%}.home-mobile .media-box{order:-1;max-width:220px}.home-mobile .media-box img{max-height:340px}.photo-grid,.photo-grid.four{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.photo-grid img,.photo-grid.four img{max-height:145px}.photo-grid .media-placeholder{height:130px}.interest-grid,.twin-grid,.resource-list,.index-groups{grid-template-columns:1fr}.interest-card{padding:18px}.footer-layout{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}.footer-about{grid-column:1/-1}.footer-links{grid-template-columns:1fr}.gallery-grid{gap:12px}.media-box img{max-height:185px}}
@media(max-width:374px){.topbar-inner{width:calc(100% - 24px)}.brand{width:88px}.brand .logo-media img{max-width:88px}.enter-link{padding-inline:9px;font-size:11px}.menu-toggle{width:38px;flex-basis:38px}.photo-grid,.photo-grid.four,.gallery-grid{grid-template-columns:1fr}.gallery-grid .media-box:first-child{grid-column:auto}.related-grid{grid-template-columns:1fr}.footer-layout{grid-template-columns:1fr}.footer-about{grid-column:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
