:root{--bg:#f5fbff;--white:#fff;--soft:#eaf7fc;--sky:#25b6e8;--cyan:#25c8d1;--blue:#1787db;--navy:#174b78;--heading:#173b60;--text:#2d4359;--muted:#687f93;--border:#dcebf3;--footer:#123653;--shadow:0 15px 38px rgba(19,75,113,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden}body.drawer-open{overflow:hidden}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid #1787db;outline-offset:4px}h1,h2,h3{color:var(--heading);line-height:1.38;letter-spacing:-.02em}h1{font-size:34px;margin:0 0 20px}h2{font-size:26px;margin:0 0 20px}h3{font-size:20px;margin:0 0 12px}p{margin:0 0 18px}ul,ol{padding-left:1.5em}li{margin:.4em 0}strong{color:var(--heading)}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;z-index:100;top:-100px;left:20px;padding:10px;background:#fff}.skip-link:focus{top:10px}.site-header{background:#fff;border-bottom:1px solid var(--border);position:relative;z-index:20}.header-inner{min-height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:9px;flex:none;color:var(--heading)}.brand:hover{text-decoration:none}.brand img{width:auto;max-width:190px;height:37px;object-fit:contain}.brand-icon{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;font-size:23px;color:#fff;font-weight:800;background:linear-gradient(125deg,var(--cyan),var(--blue))}.brand-name{font-size:19px;font-weight:800;line-height:1.1}.brand-name small{display:block;font-size:9px;letter-spacing:.15em;color:var(--muted);margin-top:5px}.desktop-nav{display:flex;gap:18px;align-items:center;margin-left:auto;white-space:nowrap}.desktop-nav a{font-size:14px;font-weight:700;color:var(--navy);padding:21px 1px;border-bottom:3px solid transparent}.desktop-nav a.active,.desktop-nav a:hover{color:var(--blue);border-color:var(--cyan);text-decoration:none}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-width:82px;height:42px;padding:0 20px;border-radius:999px;background:linear-gradient(110deg,#25c8d1,#25b6e8,#1787db);color:#fff;font-weight:700;text-decoration:none;white-space:nowrap}.main-btn:hover{color:white;opacity:.91;text-decoration:none}.header-cta{margin-left:6px;font-size:14px}.menu-toggle{display:none;appearance:none;border:0;background:transparent;width:42px;height:42px;cursor:pointer;padding:10px}.menu-toggle span{display:block;height:2px;background:var(--heading);margin:5px 0;border-radius:2px}.drawer-overlay{position:fixed;inset:0;background:rgba(11,33,50,.46);z-index:30;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer{position:fixed;left:0;top:0;bottom:0;width:min(340px,86vw);z-index:31;transform:translateX(-101%);visibility:hidden;transition:transform .25s,visibility .25s;background:white;padding:20px 24px;overflow:auto;box-shadow:var(--shadow)}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .drawer{transform:translateX(0);visibility:visible}.drawer-top{display:flex;align-items:center;justify-content:space-between;font-weight:800;color:var(--heading);padding-bottom:15px;border-bottom:1px solid var(--border)}.drawer-close{border:0;background:var(--soft);color:var(--heading);font-size:28px;line-height:1;width:36px;height:36px;border-radius:10px;cursor:pointer}.drawer-group{padding:14px 0;border-bottom:1px solid var(--border)}.drawer-group h2{font-size:13px;letter-spacing:.1em;color:var(--muted);margin-bottom:6px}.drawer-group a{display:block;padding:6px 0;font-weight:700;color:var(--heading)}.drawer-group a.active{color:var(--blue)}.page-hero{background:linear-gradient(125deg,#e6faff,#f5fbff 62%,#edf6ff);padding:52px 0 46px;border-bottom:1px solid var(--border)}.hero-layout{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}.eyebrow{display:inline-flex;gap:7px;align-items:center;color:#167eab;font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;margin-bottom:15px}.lead{font-size:18px;color:#47657b;max-width:700px;line-height:1.82}.hero-text .lead{max-width:600px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}.text-link{display:inline-flex;align-items:center;padding:8px 4px;font-weight:700}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:var(--soft);border-radius:16px;min-height:170px;border:1px solid #d4ebf4}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-hero{height:310px}.media-wide{height:245px}.media-card{height:180px}.media-square{height:230px}.media-tall{height:330px}.media-placeholder{display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:14px;padding:16px;font-size:14px;font-weight:700;color:#4d8bab;height:100%;width:100%;background:radial-gradient(circle at 25% 35%,#d1f4fb,transparent 50%),linear-gradient(140deg,#e5f8fc,#cfeaf9)}.placeholder-mark{display:block;width:72px;height:72px;border-radius:22px;background:linear-gradient(135deg,rgba(37,200,209,.3),rgba(23,135,219,.22));border:1px solid rgba(23,135,219,.18);position:relative}.placeholder-mark:before,.placeholder-mark:after{content:'';position:absolute;border-radius:50%;border:2px solid #67b9d6}.placeholder-mark:before{width:38px;height:38px;inset:14px}.placeholder-mark:after{width:10px;height:10px;inset:28px;background:#67b9d6}.section{padding:45px 0}.section+.section{padding-top:18px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:22px}.section-heading h2{margin:0}.section-subtitle{color:var(--muted);font-size:15px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.feature-card,.panel,.article-card{background:white;border:1px solid var(--border);border-radius:17px;padding:25px;box-shadow:var(--shadow)}.feature-card h3,.article-card h3{margin-top:0}.feature-card p:last-child,.panel p:last-child{margin-bottom:0}.feature-card .num{font-size:12px;font-weight:900;color:#1299be;letter-spacing:.15em}.card-link{font-weight:800}.feature-card .media{margin-bottom:20px}.topic-strip{background:var(--heading);color:white;padding:30px 35px;border-radius:18px;display:flex;justify-content:space-between;align-items:center;gap:30px}.topic-strip h2{color:white;margin:0 0 5px}.topic-strip p{margin:0;color:#d1ebf7}.topic-strip a{background:#fff;color:var(--heading);padding:10px 24px;border-radius:30px;white-space:nowrap;font-weight:800}.article-shell{padding:45px 0 70px}.article-intro{max-width:820px;margin-bottom:32px}.article-intro .lead{font-size:17px}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:38px;align-items:start}.article-body{max-width:820px;min-width:0}.article-body>section{margin-bottom:40px}.article-body h2{margin-top:0;padding-bottom:12px;border-bottom:1px solid var(--border)}.article-body h3{margin-top:24px}.article-body p,.article-body li{line-height:1.83}.side-rail{position:sticky;top:25px;background:white;border:1px solid var(--border);border-radius:16px;padding:24px}.side-rail h2{font-size:19px}.side-rail a{display:block;margin:12px 0;font-weight:700}.inline-note{background:var(--soft);border-left:4px solid var(--cyan);padding:20px 23px;border-radius:0 12px 12px 0;margin:23px 0}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}.comparison>div{padding:23px;border:1px solid var(--border);background:#fff;border-radius:14px}.comparison h3{margin-top:0}.mini-label{font-size:12px;letter-spacing:.1em;color:#1292b9;font-weight:800}.data-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--border);font-size:15px}.data-table th,.data-table td{text-align:left;vertical-align:top;padding:13px 16px;border-bottom:1px solid var(--border)}.data-table th{background:#e8f6fc;color:var(--heading)}.table-scroll{overflow-x:auto;margin:18px 0 28px}.timeline{border-left:3px solid var(--cyan);margin:20px 0 30px;padding-left:28px}.timeline>div{position:relative;padding-bottom:15px}.timeline>div:before{content:'';position:absolute;left:-36px;top:8px;width:12px;height:12px;background:var(--cyan);border:3px solid var(--bg);border-radius:50%}.timeline h3{margin:0 0 5px}.timeline p{margin-bottom:8px}.quote-block{padding:25px 30px;background:#e7f6fb;border-radius:17px;color:var(--heading);font-size:19px;font-weight:700;margin:25px 0}.related{margin-top:32px;border-top:1px solid var(--border);padding-top:25px}.related h2{font-size:20px}.related-links{display:flex;flex-wrap:wrap;gap:10px}.related-links a{border:1px solid #cde6f1;background:white;border-radius:999px;padding:6px 15px;font-size:14px;font-weight:700}.editorial-list{list-style:none;padding:0}.editorial-list li{display:flex;gap:18px;border-bottom:1px solid var(--border);padding:16px 0;margin:0}.editorial-list .count{font-weight:900;font-size:26px;color:#78bacd;line-height:1.2}.editorial-list strong{display:block}.editorial-list span{display:block}.wide-feature{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;background:#fff;padding:26px;border:1px solid var(--border);border-radius:18px}.tag-row{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}.tag{font-size:12px;background:#dff5fb;color:#136d96;border-radius:20px;padding:4px 11px;font-weight:800}.faq-list details{background:#fff;border:1px solid var(--border);margin-bottom:12px;border-radius:12px;padding:14px 18px}.faq-list summary{cursor:pointer;font-weight:800;color:var(--heading)}.faq-list details p{margin:12px 0 2px}.site-footer{background:var(--footer);color:#d7ecf8;margin-top:25px}.footer-grid{display:grid;grid-template-columns:2.1fr 1fr 1fr;gap:65px;padding-top:48px;padding-bottom:36px}.footer-logo{font-size:23px;font-weight:900;color:#fff}.footer-logo span{font-size:11px;color:#a5e5f6;letter-spacing:.13em}.footer-grid h2{font-size:17px;color:#fff}.footer-grid p{font-size:14px}.footer-grid nav{display:grid;gap:5px}.footer-grid a{font-size:14px;color:#d7ecf8}.footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.15);font-size:12px;color:#b5cddb}.mobile-bottom{display:none}.back-top{position:fixed;right:24px;bottom:24px;background:var(--blue);border:0;border-radius:50%;color:white;font-size:24px;width:44px;height:44px;cursor:pointer;opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s;z-index:12}.back-top.visible{opacity:1;visibility:visible}@media(max-width:1100px){.desktop-nav{gap:10px}.desktop-nav a{font-size:13px}.header-inner{gap:13px}.brand img{max-width:145px}}@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:block}.header-inner{min-height:60px;justify-content:space-between}.brand{position:absolute;left:50%;transform:translateX(-50%)}.brand img{height:29px;max-width:160px}.brand-icon{width:29px;height:29px;font-size:18px;border-radius:8px}.brand-name{font-size:16px}.brand-name small{font-size:7px}.header-cta{margin-left:auto;height:40px;padding:0 13px;font-size:13px}.article-grid{grid-template-columns:minmax(0,1fr) 210px;gap:22px}.footer-grid{gap:30px}}@media(max-width:700px){body{font-size:15px}.container{width:calc(100% - 32px)}h1{font-size:27px}h2{font-size:21px}h3{font-size:18px}.page-hero{padding:30px 0}.hero-layout{grid-template-columns:1fr;gap:22px}.hero-layout .media{grid-row:1}.lead{font-size:16px}.media-hero{height:200px}.media-wide{height:185px}.media-card{height:155px}.media-tall{height:270px}.section{padding:31px 0}.section+.section{padding-top:9px}.grid-3,.grid-2,.comparison{grid-template-columns:1fr}.feature-card,.panel,.article-card{padding:20px}.topic-strip{display:block;padding:25px}.topic-strip a{display:inline-block;margin-top:15px}.wide-feature{grid-template-columns:1fr;padding:18px;gap:15px}.article-shell{padding:30px 0 45px}.article-grid{display:block}.side-rail{position:static;margin-top:30px}.footer-grid{grid-template-columns:1fr 1fr;gap:25px;padding:35px 0}.footer-grid>div:first-child{grid-column:1/-1}.footer-bottom{display:block;padding-bottom:85px}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;z-index:16;background:white;border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{font-size:13px;color:var(--navy);font-weight:800;text-align:center;padding:11px 3px}.back-top{bottom:74px;right:14px}.data-table{font-size:13px}.data-table td,.data-table th{padding:10px}.section-heading{align-items:start;flex-direction:column;gap:4px}}@media(max-width:360px){.header-cta{padding:0 10px;min-width:65px}.brand-name{font-size:14px}.brand-name small{font-size:6px}.menu-toggle{width:36px;padding:8px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}