*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#EAF2FB;color:#24364F;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#137CD8;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid #137CD8;outline-offset:3px}img{max-width:100%;height:auto}.wrap{width:min(100% - 48px,1160px);margin-inline:auto}.skip-link{position:absolute;left:12px;top:-80px;background:white;z-index:13000;padding:6px 16px}.skip-link:focus{top:6px}.site-header{position:sticky;top:0;background:#fff;z-index:1000;box-shadow:0 3px 15px rgba(16,43,70,.07)}.topbar{height:70px;display:flex;align-items:center;gap:32px}.brand{display:inline-flex;align-items:center;flex:none;color:#137CD8;white-space:nowrap;font-size:21px;line-height:1.2}.brand img{display:block;width:auto;height:36px;max-width:160px;object-fit:contain}.primary-nav{display:flex;gap:20px;align-items:stretch;white-space:nowrap;margin:auto}.primary-nav a{display:inline-flex;align-items:center;border-bottom:2px solid transparent;color:#24364F;font-size:14px}.primary-nav a.is-current,.primary-nav a:hover{border-bottom-color:#137CD8;color:#137CD8;text-decoration:none}.register-btn,.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;background:#137CD8;color:#fff;min-height:42px;padding:5px 22px;font-size:14px;font-weight:bold;white-space:nowrap}.register-btn:hover,.btn:hover{background:#0C5FA9;color:#fff;text-decoration:none}.topicbar{background:#F7FBFF;border-top:1px solid #EAF2FB}.topic-scroll{min-height:44px;display:flex;align-items:center;gap:0;overflow-x:auto;scrollbar-width:thin}.topic-scroll a{white-space:nowrap;color:#5D718A;line-height:1.2;padding:0 15px;border-right:1px solid #DCE8F4;font-size:13px}.topic-scroll a:first-child{padding-left:0}.topic-scroll a:last-child{border:0}.topic-scroll a.is-current{color:#137CD8;font-weight:700}.main-content{padding-block:32px 60px}.panel,.article-card,.feature-card,.category-card{background:#fff;border:1px solid rgba(47,168,247,.14);border-radius:12px}.panel{padding:28px}.hero{display:grid;grid-template-columns:54fr 46fr;gap:28px;align-items:center}.hero h1{font-size:37px;line-height:1.34;margin:0 0 16px;color:#102B46}.hero p,.intro{color:#5D718A}.hero .media{height:min(25vw,285px)}.hero .hero-media{grid-column:2;grid-row:1}.hero-copy{grid-column:1;grid-row:1}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.hero-actions a:not(.btn){display:inline-flex;align-items:center;padding:6px 12px;border-radius:50px;background:#F0F8FF}.section{margin-top:42px}.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:16px}.section-head h2,.related h2{font-size:25px;margin:0;color:#102B46;line-height:1.4}.section-head>a{font-size:14px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.category-card,.feature-card{padding:22px;min-width:0}.category-card h3,.feature-card h3{font-size:19px;line-height:1.5;margin:0 0 10px;color:#102B46}.category-card p,.feature-card p{color:#5D718A;font-size:15px;line-height:1.75;margin:0 0 12px}.text-link{font-weight:bold}.article-index{margin:0;padding:0;list-style:none;counter-reset:index}.article-index li{counter-increment:index;background:#fff;padding:15px 18px;border-bottom:1px solid #E7F0F8;display:flex;gap:15px;align-items:baseline}.article-index li:before{content:counter(index,decimal-leading-zero);color:#137CD8;font-weight:bold}.article-index li:first-child{border-radius:12px 12px 0 0}.article-index li:last-child{border:0;border-radius:0 0 12px 12px}.text-split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.section .panel h3{margin:0 0 8px;color:#102B46}.section .panel p{margin:0 0 14px}.section .panel p:last-child{margin:0}.page-heading{padding:26px 32px;margin-bottom:20px;background:white;border-radius:12px}.breadcrumb{font-size:13px;color:#5D718A}.page-heading h1{margin:10px 0;font-size:32px;line-height:1.45;color:#102B46}.page-heading p{max-width:820px;margin:0;color:#5D718A}.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;align-items:start;gap:22px}.article-body{padding:32px 36px;min-width:0}.article-body h2{font-size:24px;margin:26px 0 12px;line-height:1.5;color:#102B46}.article-body h2:first-child{margin-top:0}.article-body p{margin:0 0 17px}.sidebar{padding:22px}.sidebar h2{font-size:18px;margin:0 0 12px}.sidebar a{display:block;padding:10px 0;border-bottom:1px solid #E7F0F8;font-size:14px}.sidebar a:last-child{border:0}.related{margin-top:28px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:14px}.related-grid a{display:flex;justify-content:space-between;background:#fff;border:1px solid #DFEBF7;border-radius:10px;padding:16px;font-size:14px;gap:10px}.media{display:flex;align-items:center;justify-content:center;width:100%;max-width:100%;min-width:0;overflow:hidden;border-radius:12px;background:#EDF5FF}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{width:100%;height:100%;min-height:60px;background:linear-gradient(135deg,#EDF5FF,#E3F0FC);border-radius:inherit}.media-wide{aspect-ratio:16/9}.media-banner{aspect-ratio:16/7}.media-square{aspect-ratio:1/1}.media-portrait{aspect-ratio:3/4}.media-device{aspect-ratio:9/16;max-height:340px}.media-natural img{width:100%;height:auto;max-height:280px;object-fit:contain;margin:auto}.visual-card{background:#fff;border-radius:12px;padding:14px}.visual-card .media{height:175px;aspect-ratio:auto}.visual-card p{font-size:14px;line-height:1.65;margin:10px 3px 2px}.brand-card .media{height:124px;aspect-ratio:auto}.brand-card h3{margin:10px 0 4px;font-size:16px}.brand-card p{font-size:13px}.device-split{display:grid;grid-template-columns:1.25fr .75fr;gap:26px;align-items:center}.device-split .media{max-width:260px;margin:auto}.faq-list details{border-top:1px solid #E0EDF7;padding:14px 0}.faq-list summary{cursor:pointer;font-weight:bold}.faq-list p{padding:12px 3px 0;margin:0}.disclaimer{border-left:3px solid #137CD8;padding:15px 20px;background:#F7FBFF;margin-top:22px;border-radius:0 10px 10px 0}.site-footer{background:#102B46;color:#EAF6FF;padding-top:40px}.footer-grid{display:grid;grid-template-columns:1.25fr repeat(3,1fr);gap:28px}.footer-grid h2{font-size:17px;color:#fff;margin:0 0 12px}.footer-grid a:not(.brand){display:block;color:#EAF6FF;font-size:14px;padding:4px 0}.footer-logo{color:#fff}.footer-brand p{font-size:14px;color:#D1E6F5}.footer-bottom{border-top:1px solid #34516B;margin-top:28px;padding:15px 0 23px;display:flex;justify-content:space-between;gap:20px;font-size:13px}.footer-bottom p{margin:0}.mobile-bottom,.menu-toggle,.mobile-drawer,.drawer-mask{display:none}.back-top{position:fixed;right:25px;bottom:25px;border:0;border-radius:50%;background:#137CD8;color:#fff;width:42px;height:42px;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .2s}.back-top.is-visible{opacity:1;pointer-events:auto}@media(max-width:1100px){.topbar{gap:16px}.primary-nav{gap:12px}.primary-nav a{font-size:13px}}@media(max-width:980px){.wrap{width:min(100% - 40px,1160px)}.topbar{height:58px;justify-content:space-between;gap:10px}.primary-nav{display:none}.menu-toggle{display:flex;width:38px;height:38px;flex:none;flex-direction:column;justify-content:center;gap:5px;align-items:center;border:0;background:none;cursor:pointer;padding:6px}.menu-toggle span{width:22px;height:2px;background:#24364F}.brand{margin-inline:auto}.brand img{height:29px;max-width:130px}.register-btn{height:36px;min-height:36px;padding:4px 13px;font-size:13px}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);height:100dvh;overflow-y:auto;background:#fff;z-index:12000;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .2s ease,visibility .2s}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-mask{display:block;position:fixed;inset:0;background:rgba(16,43,70,.38);z-index:11000;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s ease,visibility .18s}.drawer-mask.is-visible{opacity:1;visibility:visible;pointer-events:auto}.drawer-open{overflow:hidden}.drawer-head{position:sticky;top:0;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid #E4EFF7;padding:16px;z-index:1}.drawer-close{font-size:29px;border:0;background:none;color:#24364F;cursor:pointer}.drawer-group{padding:14px 20px;border-bottom:1px solid #E4EFF7}.drawer-group h2{font-size:14px;color:#5D718A;margin:0 0 8px}.drawer-group a{display:block;min-height:42px;padding:9px 4px;color:#24364F}.drawer-group a.is-current{color:#137CD8;font-weight:bold}.mobile-bottom{display:grid;position:fixed;bottom:0;left:0;right:0;grid-template-columns:repeat(4,1fr);height:60px;background:#fff;border-top:1px solid #DCEAF6;z-index:900}.mobile-bottom a{display:flex;align-items:center;justify-content:center;color:#5D718A;font-size:14px}.mobile-bottom .is-current{color:#137CD8;font-weight:bold}.site-footer{padding-bottom:60px}.back-top{bottom:76px}.reading-layout{grid-template-columns:1fr}.sidebar{display:none}}@media(max-width:768px){.main-content{padding-block:22px 42px}.wrap{width:min(100% - 32px,1160px)}.hero{grid-template-columns:1fr}.hero .hero-media,.hero-copy{grid-column:1}.hero .hero-media{grid-row:1}.hero-copy{grid-row:2}.hero .media{height:auto;max-height:195px}.hero h1{font-size:28px}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.section{margin-top:30px}.section-head h2,.related h2{font-size:21px}.page-heading h1{font-size:27px}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{display:block}.article-body{padding:24px}.article-body h2{font-size:21px}.text-split{grid-template-columns:1fr}.device-split{grid-template-columns:1fr}.device-split .media{order:-1;max-height:260px}.visual-card .media{height:145px}}@media(max-width:430px){.panel{padding:19px}.hero h1{font-size:26px}.hero-actions{gap:8px}.hero-actions a{font-size:13px}.category-card,.feature-card{padding:14px}.category-card h3,.feature-card h3{font-size:16px}.category-card p,.feature-card p{font-size:14px}.page-heading{padding:18px}.page-heading h1{font-size:24px}.related-grid{grid-template-columns:1fr}.brand-card .media{height:96px}.footer-grid{gap:18px}.footer-grid h2{font-size:15px}.visual-card .media{height:120px}}@media(max-width:345px){.brand{font-size:18px}.brand img{max-width:104px}.register-btn{padding-inline:9px;font-size:12px}.grid-3{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}