:root{--bg:#eaf2fb;--blue:#137cd8;--bright:#2fa8f7;--ink:#24364f;--muted:#5d718a;--border:rgba(47,168,247,.14)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);line-height:1.8;font-size:16px}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid #0d67b0;outline-offset:3px}.wrap{width:min(100% - 48px,1160px);margin-inline:auto}.skip{position:absolute;left:-9999px;top:5px;z-index:20000;background:#fff;padding:8px}.skip:focus{left:10px}.site-header{position:sticky;top:0;z-index:900;background:#fff;box-shadow:0 2px 14px rgba(10,47,85,.06)}.topbar{height:70px;display:flex;align-items:center;gap:22px}.logo{display:flex;align-items:center;gap:8px;color:#123957;min-width:0;white-space:nowrap;font-size:20px;font-weight:800;line-height:1.1}.logo small{display:block;font-size:9px;letter-spacing:1.4px;color:#6687a4;margin-top:5px}.logo .media{width:60px;height:38px;background:transparent;flex:none}.logo img{max-width:60px;max-height:38px}.desktop-nav{display:flex;align-items:center;gap:18px;margin:auto;white-space:nowrap}.desktop-nav a{display:flex;align-items:center;height:70px;color:var(--ink);font-size:14px;border-bottom:2px solid transparent}.desktop-nav a.active{border-color:var(--blue);color:var(--blue)}.register,.btn{display:inline-flex;align-items:center;justify-content:center;min-height:41px;padding:6px 19px;background:#137cd8;color:#fff;border-radius:999px;font-weight:700;font-size:14px;white-space:nowrap}.register:hover,.btn:hover{color:#fff;background:#0a64b4;text-decoration:none}.subnav{background:#f7fbff;border-top:1px solid #eff5fd}.subnav-scroll{display:flex;align-items:center;height:44px;overflow-x:auto;scrollbar-width:thin;white-space:nowrap;gap:0}.subnav a{color:var(--muted);font-size:14px;flex:none;padding:0 15px;border-right:1px solid #d9e7f5}.subnav a:first-child{padding-left:0}.subnav a.active{color:var(--blue);font-weight:700}.menu-toggle,.mobile-bottom,.mobile-drawer,.drawer-mask{display:none}.main-content{padding-top:32px;padding-bottom:60px}.panel,.card,.article-card,.feature{background:#fff;border:1px solid var(--border);border-radius:12px;padding:24px}.section{margin-top:40px}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}.section-title h2{margin:0;font-size:24px;color:#123c66;line-height:1.4}.section-title a{font-size:14px;white-space:nowrap}.eyebrow{display:inline-block;color:#137cd8;font-weight:700;font-size:13px;margin-bottom:10px}.hero{display:grid;grid-template-columns:54fr 46fr;gap:24px;align-items:center}.hero h1{font-size:36px;line-height:1.36;margin:4px 0 15px;color:#163b62}.hero p,.intro{color:#536b83;font-size:17px;line-height:1.85}.hero-media{grid-column:2;grid-row:1}.hero-copy{grid-column:1;grid-row:1}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.text-link{padding:8px 12px;background:#f0f7ff;border-radius:20px;font-size:14px}.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))}.card h3,.article-card h3{font-size:19px;margin:0 0 8px;color:#1a466f;line-height:1.5}.card p,.article-card p{margin:0 0 12px;color:#516880}.card a{font-weight:700}.media{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;max-width:100%;overflow:hidden;background:#edf5ff;border-radius:12px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.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}.media-logo{aspect-ratio:3/2}.media-placeholder{width:100%;height:100%;min-height:45px;background:linear-gradient(135deg,#edf5ff,#e1f0fc)}.hero .media{max-height:300px}.image-card .media{max-height:195px}.image-card figcaption{font-size:13px;color:var(--muted);margin-top:10px}.image-card{margin:0}.image-card .media{margin-bottom:8px}.brand-card{padding:14px;display:flex;align-items:center;gap:12px;min-width:0}.brand-card .media{width:96px;height:85px;flex:0 0 96px}.brand-card h3{font-size:16px;margin:0}.brand-card p{font-size:13px;margin:4px 0 0}.split{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}.reading-list{list-style:none;padding:0;margin:0;counter-reset:reading}.reading-list li{counter-increment:reading;padding:14px 0;border-bottom:1px solid #e6f0fa;display:flex;gap:12px}.reading-list li::before{content:counter(reading,decimal-leading-zero);font-weight:800;color:#137cd8}.reading-list li a{font-weight:700}.reading-list li p{color:#5d718a;margin:3px 0 0;font-size:14px}.article-head{margin-bottom:25px}.article-head h1{font-size:32px;color:#153f68;line-height:1.4;margin:3px 0 10px}.article-head .intro{max-width:820px;margin:0}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:22px;align-items:start}.article-main{min-width:0}.article-main h2{font-size:24px;color:#164d82;margin:23px 0 10px}.article-main h3{font-size:19px;color:#1d4c76}.article-main p{margin:0 0 18px}.article-main .feature{margin-bottom:20px}.side{position:sticky;top:145px}.side h2{font-size:18px;margin:0 0 12px}.side a{display:block;padding:9px 0;border-bottom:1px solid #e8f1f8}.pill-links{display:flex;gap:10px;flex-wrap:wrap}.pill-links a{background:#edf7ff;padding:8px 14px;border-radius:20px;font-size:14px}.notice-panel{border-left:4px solid var(--blue);padding:20px;background:#fff;border-radius:8px}.faq details{border:1px solid #e1ecf7;border-radius:10px;margin-bottom:10px;background:#fff;padding:12px 17px}.faq summary{cursor:pointer;font-weight:700;color:#1c4b75}.faq p{margin:10px 0 0}.site-footer{background:#102b46;color:#eaf6ff}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px;padding:44px 0 28px}.site-footer h2{font-size:17px;margin:0 0 12px}.site-footer a{color:#eaf6ff;display:block;margin:5px 0;font-size:14px}.site-footer p{font-size:14px;color:#c8dded}.foot-logo{display:flex!important;align-items:center;gap:12px;font-size:21px!important}.foot-logo .media{width:70px;height:50px;background:transparent}.foot-logo img{max-height:50px}.footer-bottom{border-top:1px solid #33516a;display:flex;justify-content:space-between;gap:20px;font-size:13px;padding:20px 0 28px;color:#c4d9ec}.backtop{position:fixed;right:22px;bottom:20px;border:0;border-radius:50%;width:42px;height:42px;background:#137cd8;color:white;font-size:22px;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .2s;z-index:700}.backtop.visible{opacity:1;pointer-events:auto}
@media(max-width:1100px){.desktop-nav{gap:12px}.topbar{gap:12px}.logo{font-size:17px}.logo .media{width:48px}.desktop-nav a{font-size:13px}}
@media(max-width:980px){.wrap{width:calc(100% - 40px)}.topbar{height:59px;justify-content:space-between}.desktop-nav{display:none}.menu-toggle{display:flex;flex-direction:column;gap:5px;justify-content:center;align-items:center;background:transparent;border:0;width:40px;height:42px;cursor:pointer;flex:none}.menu-toggle span{display:block;width:23px;height:2px;background:#24364f}.logo{font-size:17px}.logo .media{width:45px;height:30px}.logo img{max-height:30px}.logo small{font-size:8px}.register{min-height:36px;padding:5px 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}body.drawer-open{overflow:hidden}.drawer-top{display:flex;align-items:center;justify-content:space-between;padding:15px;border-bottom:1px solid #e3ecf7}.drawer-top button{font-size:27px;background:none;border:0;color:#24364f;width:42px;height:42px}.drawer-group{padding:8px 15px 13px;border-bottom:1px solid #e9f0f8}.drawer-group h2{font-size:14px;color:#5d718a;margin:7px 0}.drawer-group a{display:block;padding:8px 11px;min-height:40px;color:#24364f;border-radius:6px;font-size:14px}.drawer-group a.active{color:#137cd8;background:#f1f8ff}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;height:60px;background:#fff;z-index:1000;box-shadow:0 -2px 15px #c5d9ea66;padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;color:#4a6480;font-size:14px}.mobile-bottom a.active{color:#137cd8;font-weight:700}.main-content{padding-bottom:100px}.backtop{bottom:75px}.article-layout{grid-template-columns:1fr}.side{position:static}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero h1{font-size:30px}}
@media(max-width:768px){.hero{grid-template-columns:1fr}.hero-media{grid-column:1;grid-row:1}.hero-copy{grid-column:1;grid-row:2}.hero .media{max-height:195px}.grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.split{grid-template-columns:1fr}.main-content{padding-top:24px}.hero h1{font-size:28px}.article-head h1{font-size:27px}.section-title h2{font-size:22px}.section{margin-top:30px}.footer-bottom{display:block}.footer-bottom span{display:block;margin-bottom:8px}}
@media(max-width:480px){.wrap{width:calc(100% - 32px)}.logo{font-size:15px;gap:5px}.logo .media{width:34px;height:29px}.logo small{font-size:7px;letter-spacing:.7px}.topbar{gap:5px}.menu-toggle{width:34px}.register{font-size:12px;padding:5px 10px}.panel,.card,.article-card,.feature{padding:17px}.grid{gap:12px}.grid-2,.grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-2 .card h3,.grid-3 .card h3{font-size:16px}.grid-2 .card p,.grid-3 .card p{font-size:14px}.grid-2 .card a,.grid-3 .card a{font-size:13px}.brand-card{display:block}.brand-card .media{width:100%;height:90px}.brand-card p{font-size:12px}.image-card .media{max-height:145px}.hero h1{font-size:26px}.hero p,.intro{font-size:15px}.article-head h1{font-size:25px}.article-main h2{font-size:21px}.article-main p{font-size:15px}.footer-grid{gap:15px}.footer-grid h2{font-size:15px}.footer-grid a{font-size:13px}}
@media(max-width:350px){.logo .media{width:28px}.logo{font-size:14px}.logo small{letter-spacing:0}.register{padding:4px 8px}.menu-toggle{width:30px}.grid-2,.grid-3{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}