:root{--bg:#f5fbff;--white:#fff;--soft:#eaf7fc;--light:#dff5fb;--aqua:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--title:#173b60;--text:#2d4359;--muted:#687f93;--line:#dcebf3;--footer:#123653;--shadow:0 12px 38px rgba(23,75,120,.075)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}body.menu-open{overflow:hidden}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}button{font:inherit;cursor:pointer}h1,h2,h3,p,figure{margin-top:0}h1,h2,h3{color:var(--title);line-height:1.4}h1{font-size:clamp(30px,3.3vw,40px);letter-spacing:-.02em}h2{font-size:25px}h3{font-size:19px}p{margin-bottom:16px}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:fixed;top:-80px;left:16px;padding:8px 14px;background:#fff;z-index:2000}.skip-link:focus{top:8px}.site-header{height:72px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:200}.header-inner{height:100%;display:flex;align-items:center;gap:22px}.site-logo{min-width:145px;display:inline-flex;align-items:center;justify-content:flex-start}.site-logo img{width:auto;max-width:164px;max-height:38px;object-fit:contain}.logo-type{font-size:24px;font-weight:900;white-space:nowrap;color:var(--navy);letter-spacing:-1px}.logo-type span{color:var(--aqua)}.desktop-nav{display:flex;justify-content:center;align-items:center;flex:1;gap:3px;white-space:nowrap}.desktop-nav a{font-size:14px;padding:9px 10px;border-radius:9px;color:var(--navy);font-weight:650}.desktop-nav a.active,.desktop-nav a:hover{color:#087ca9;background:var(--soft);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;white-space:nowrap;box-shadow:0 6px 16px #1787db26}.main-btn:hover{filter:brightness(.97);color:#fff;text-decoration:none}.menu-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:42px;height:42px;background:transparent;border:1px solid var(--line);border-radius:11px}.menu-toggle span{width:19px;height:2px;background:var(--navy)}.menu-overlay{position:fixed;inset:0;background:rgba(12,34,58,.55);z-index:300;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.menu-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{position:fixed;z-index:301;top:0;bottom:0;left:0;width:min(86vw,340px);overflow-y:auto;background:#fff;box-shadow:0 0 36px #12365325;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .24s,visibility .24s;padding:20px 18px 34px}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;color:var(--title);gap:8px;font-size:17px;margin-bottom:16px}.drawer-close{background:var(--soft);border:0;width:38px;height:38px;border-radius:50%;font-size:27px;line-height:1}.drawer-label{font-weight:800;font-size:12px;color:#5291a8;letter-spacing:.09em;text-transform:uppercase;margin:22px 0 6px}.mobile-drawer a{display:block;color:var(--navy);padding:9px 12px;border-bottom:1px solid var(--line)}.mobile-drawer a:hover{background:var(--soft)}.hero{padding:56px 0 40px;background:radial-gradient(circle at 82% 24%,#c9f1ff 0%,transparent 35%),linear-gradient(135deg,#eefaff,#f7fcff)}.hero-grid{display:grid;grid-template-columns:1.03fr .97fr;gap:46px;align-items:center}.eyebrow{display:inline-block;color:#077e9b;background:#dcf6fb;border:1px solid #b2eaf1;padding:3px 12px;border-radius:100px;font-size:13px;font-weight:700;letter-spacing:.03em;margin-bottom:14px}.hero h1{font-size:clamp(31px,3.3vw,40px);margin:0 0 20px}.hero-lead{font-size:17px;line-height:1.85;max-width:580px}.hero-actions{display:flex;flex-wrap:wrap;gap:13px;margin-top:24px}.outline-btn{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 18px;border:1px solid #a7dbe9;border-radius:100px;color:var(--navy);background:#ffffffa8;font-weight:700}.outline-btn:hover{background:#fff;text-decoration:none}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:var(--soft);border-radius:14px;margin:0;min-width:0}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media--hero{height:315px;box-shadow:var(--shadow)}.media--wide{height:230px}.media--feature{height:255px}.media--thumb{height:165px}.media--portrait{height:330px;max-width:360px;margin-inline:auto}.media--banner{height:210px}.media-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(135deg,#dff5fb,#eaf7fc 55%,#d6eff9);color:#40738b;text-align:center;font-weight:750;font-size:15px}.media-placeholder span{border:1px solid #add9e8;padding:13px 18px;border-radius:12px;max-width:90%;background:#ffffff66}.section{padding:46px 0}.section--white{background:#fff}.section--soft{background:var(--soft)}.section-head{max-width:760px;margin-bottom:25px}.section-head p{color:var(--muted)}.grid{display:grid;gap:20px}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.tile{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow);color:var(--text)}.tile:hover{transform:translateY(-2px);text-decoration:none;box-shadow:0 14px 38px #174b781b}.tile h3{margin:0 0 8px}.tile p{font-size:15px;margin:0}.tile .tile-link{display:inline-block;margin-top:13px;color:var(--blue);font-size:14px;font-weight:700}.tag{display:inline-block;color:#107996;font-size:12px;font-weight:800;margin-bottom:8px}.split{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}.split--reverse> :first-child{order:2}.mini-list{display:grid;gap:12px}.mini-list a{display:block;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:10px;font-weight:700}.mini-list a:hover{background:#f8fdff}.editorial-list{display:grid;gap:0;border-top:1px solid var(--line)}.editorial-row{display:grid;grid-template-columns:130px 1fr auto;align-items:baseline;gap:20px;padding:18px 2px;border-bottom:1px solid var(--line);color:var(--text)}.editorial-row strong{color:var(--title)}.editorial-row span{font-size:13px;color:var(--muted)}.editorial-row:hover{text-decoration:none;background:#f4fbff}.page-intro{padding:50px 0 34px;background:linear-gradient(130deg,#eaf8ff,#f7fcff);border-bottom:1px solid var(--line)}.page-intro .intro-inner{max-width:900px}.page-intro h1{font-size:34px;margin-bottom:12px}.page-intro p{font-size:17px;margin:0}.content-shell{padding-top:34px;padding-bottom:60px}.article{max-width:820px}.article h2{margin:36px 0 15px}.article h3{margin:24px 0 11px}.article p,.article li{line-height:1.84}.article ul,.article ol{padding-left:24px}.article li{margin-bottom:8px}.lead{font-size:18px;color:var(--navy)}.article-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;margin-bottom:22px}.article-card h2:first-child{margin-top:0}.content-two{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(250px,.8fr);gap:34px;align-items:start}.sidebar{position:sticky;top:94px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}.sidebar h2{font-size:19px;margin-bottom:12px}.sidebar a{display:block;border-bottom:1px solid var(--line);padding:9px 0;font-size:15px}.sidebar a:last-child{border:0}.comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.comparison>div{background:#fff;padding:24px;border:1px solid var(--line);border-radius:12px}.comparison h3{margin:0 0 12px}.info-table{overflow-x:auto;margin:20px 0 28px}.info-table table{border-collapse:collapse;min-width:520px;width:100%;font-size:15px;background:#fff}.info-table th,.info-table td{border:1px solid var(--line);padding:12px 14px;vertical-align:top;text-align:left}.info-table th{background:#e7f5fa;color:var(--title)}.note{background:#eaf7fc;border-left:4px solid var(--aqua);padding:16px 19px;border-radius:0 10px 10px 0;margin:22px 0;color:var(--navy)}.timeline{border-left:2px solid #a4dbe9;padding-left:25px;margin:26px 0}.timeline>div{position:relative;margin-bottom:24px}.timeline>div:before{content:'';position:absolute;width:11px;height:11px;background:var(--aqua);border-radius:50%;left:-31px;top:9px}.timeline h3{margin-bottom:5px}.number-list{counter-reset:step;list-style:none!important;padding:0!important}.number-list li{counter-increment:step;padding:14px 16px 14px 58px;background:#fff;border:1px solid var(--line);margin:0 0 12px;border-radius:12px;position:relative}.number-list li:before{content:counter(step);position:absolute;left:15px;top:14px;background:#dff5fb;color:#126d94;border-radius:50%;width:28px;height:28px;display:grid;place-items:center;font-weight:800}.related{margin-top:42px;border-top:1px solid var(--line);padding-top:20px}.related h2{font-size:22px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{display:flex;justify-content:space-between;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px;font-size:14px;font-weight:700}.related-links a:hover{background:var(--soft);text-decoration:none}.visual-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.visual-gallery article{background:#fff;border-radius:14px;overflow:hidden;border:1px solid var(--line)}.visual-gallery article .gallery-copy{padding:20px}.visual-gallery h3{margin-bottom:10px}.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;margin:0 0 10px;padding:0 18px}.faq summary{cursor:pointer;color:var(--title);font-weight:750;padding:13px 0}.faq details p{padding:0 0 14px;margin:0}.site-footer{background:var(--footer);color:#eaf7ff;padding:44px 0 22px}.footer-grid{display:grid;grid-template-columns:1.1fr 1.1fr .9fr;gap:40px}.site-footer h2{color:#fff;font-size:16px}.site-footer p{font-size:14px;color:#d5e9f5}.footer-brand{font-size:24px;font-weight:900;color:#fff}.footer-brand small{font-size:10px;display:block;letter-spacing:.1em;margin-top:-6px}.site-footer nav{display:grid;grid-template-columns:1fr 1fr;gap:6px}.site-footer a{color:#eaf7ff;font-size:14px}.footer-bottom{padding-top:22px;margin-top:28px;border-top:1px solid #ffffff25;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#d0e5ef}.bottom-nav{display:none}.back-top{position:fixed;right:22px;bottom:22px;border:0;border-radius:50%;background:var(--navy);color:#fff;width:42px;height:42px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:190}.back-top.is-visible{opacity:1;pointer-events:auto}
@media(max-width:1100px){.desktop-nav a{padding:9px 7px;font-size:13px}.header-inner{gap:11px}}
@media(max-width:980px){.desktop-nav{display:none}.site-header{height:60px}.header-inner{justify-content:space-between;position:relative}.menu-toggle{display:flex}.site-logo{position:absolute;left:50%;transform:translateX(-50%);justify-content:center;min-width:0}.site-logo img{max-width:138px;max-height:30px}.logo-type{font-size:21px}.header-action{margin-left:auto;height:40px;padding:0 14px;font-size:13px}.hero-grid{gap:26px}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.content-two{grid-template-columns:1fr}.sidebar{position:static}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1 / -1}}
@media(max-width:640px){body{font-size:15px}.wrap{width:calc(100% - 32px)}.hero{padding:26px 0 30px}.hero-grid{display:flex;flex-direction:column-reverse;align-items:stretch;gap:24px}.hero h1{font-size:29px}.hero-lead,.page-intro p{font-size:15px}.media--hero{height:210px}.media--feature{height:190px}.media--wide{height:180px}.media--thumb{height:145px}.media--banner{height:145px}.media--portrait{height:280px}.section{padding:30px 0}.section-head{margin-bottom:16px}.grid-3,.grid-2,.comparison,.split,.visual-gallery,.related-links{grid-template-columns:1fr}.split--reverse> :first-child{order:initial}.tile{padding:19px}.page-intro{padding:29px 0 25px}.page-intro h1{font-size:27px}.content-shell{padding-top:22px;padding-bottom:40px}.article h2{font-size:21px;margin-top:30px}.article h3{font-size:17px}.article-card{padding:18px}.lead{font-size:16px}.editorial-row{grid-template-columns:1fr auto;gap:6px}.editorial-row span{grid-column:1 / -1;grid-row:1}.footer-grid{grid-template-columns:1fr;gap:22px}.footer-grid>div:first-child{grid-column:auto}.site-footer{padding-bottom:88px}.footer-bottom{flex-direction:column;gap:5px}.bottom-nav{position:fixed;z-index:180;bottom:0;left:0;right:0;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);box-shadow:0 -4px 18px #12365312;padding:6px 0 max(6px,env(safe-area-inset-bottom))}.bottom-nav a{color:var(--navy);font-size:13px;text-align:center;padding:4px 0}.bottom-nav a.active{color:var(--blue);font-weight:800}.back-top{bottom:76px;right:15px}.media-placeholder{font-size:13px}.header-action{min-width:0}.site-logo img{max-width:116px}}
@media(max-width:365px){.logo-type{font-size:18px}.header-action{padding:0 10px;font-size:12px}.menu-toggle{width:39px;height:39px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}