*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f5fbff;color:#2d4359;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:#1787db;text-decoration:none}a:hover{color:#126aab}button{font:inherit;cursor:pointer}h1,h2,h3,h4{color:#173b60;line-height:1.4;margin:0 0 16px}h1{font-size:38px;letter-spacing:-.025em}h2{font-size:25px}h3{font-size:19px}p{margin:0 0 18px}ul,ol{padding-left:23px}li{margin:6px 0}img{display:block}.container{width:min(100% - 48px,1160px);margin-inline:auto}.site-header{background:#fff;border-bottom:1px solid #dcebf3;position:sticky;top:0;z-index:50;box-shadow:0 4px 22px #174b7809}.header-inner{min-height:72px;display:flex;align-items:center;gap:22px}.logo{display:flex;align-items:center;flex-shrink:0;max-width:185px}.logo img{height:37px;width:auto;max-width:175px;object-fit:contain}.logo-text{font-size:24px;font-weight:900;white-space:nowrap;color:#174b78;letter-spacing:1px}.logo-text span{color:#25b6e8}.desktop-nav{display:flex;align-items:center;gap:19px;flex:1;justify-content:center}.desktop-nav a{white-space:nowrap;color:#174b78;font-size:14px;font-weight:650;padding:20px 0;border-bottom:3px solid transparent}.desktop-nav a:hover,.desktop-nav a.active{color:#1787db;border-color:#25c8d1}.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 8px 24px #25b6e82a}.main-btn:hover{color:#fff;filter:brightness(.96)}.menu-toggle{display:none;width:42px;height:42px;flex-shrink:0;border:0;background:transparent;align-items:center;justify-content:center;flex-direction:column;gap:5px}.menu-toggle span{width:22px;height:2px;background:#174b78}.menu-overlay{position:fixed;inset:0;background:#092c44a8;opacity:0;visibility:hidden;pointer-events:none;z-index:80;transition:opacity .2s,visibility .2s}.mobile-menu{position:fixed;inset:0 auto 0 0;width:min(86vw,340px);background:#fff;z-index:90;transform:translateX(-102%);visibility:hidden;overflow-y:auto;transition:transform .25s,visibility .25s;padding:20px 22px 45px;box-shadow:10px 0 40px #12365322}.menu-open .menu-overlay{opacity:1;visibility:visible;pointer-events:auto}.menu-open .mobile-menu{transform:none;visibility:visible}.menu-open{overflow:hidden}.drawer-head{display:flex;justify-content:space-between;align-items:center;color:#173b60}.menu-close{border:0;background:#eaf7fc;color:#174b78;border-radius:8px;font-size:28px;width:38px;height:38px}.drawer-caption{font-size:13px;color:#687f93;padding:13px 0;border-bottom:1px solid #dcebf3}.drawer-group{display:grid;gap:2px;margin:17px 0}.drawer-group>span{color:#687f93;font-size:12px;font-weight:700;letter-spacing:.07em}.drawer-group a{padding:7px 12px;border-radius:9px;color:#174b78}.drawer-group a.active,.drawer-group a:hover{background:#eaf7fc;color:#1787db}.section{margin-block:46px}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:19px}.section-kicker,.eyebrow{display:block;font-size:12px;letter-spacing:.13em;font-weight:800;color:#1787db;text-transform:uppercase;margin-bottom:9px}.section-head p{color:#687f93;max-width:680px}.hero{padding:46px 0 34px;background:linear-gradient(135deg,#eaf7fc,#f9fdff 62%,#dff5fb)}.hero-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}.hero h1{max-width:640px}.hero-lead{font-size:17px;color:#415e77;max-width:610px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.outline-btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid #8dcced;border-radius:999px;padding:8px 22px;color:#174b78;font-weight:700;background:#ffffffb0}.hero-art{min-height:280px}.media{display:flex;align-items:center;justify-content:center;width:100%;overflow:hidden;background:#eaf7fc;border-radius:14px;min-height:160px}.media img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;object-position:center}.media-hero{height:318px;background:#dff5fb}.media-landscape{height:220px}.media-portrait{height:290px;max-width:370px}.media-placeholder{position:relative;background:linear-gradient(135deg,#dff5fb,#eaf7fc 54%,#d5eef9);border:1px solid #dcebf3}.placeholder-shape{display:block;width:62%;height:56%;border:2px solid #8dcced70;border-radius:50% 32% 48% 26%;transform:rotate(-13deg)}.placeholder-shape:after{content:"";display:block;position:absolute;width:18%;height:18%;border-radius:50%;background:#25c8d125;left:63%;top:22%}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.card{background:#fff;border:1px solid #dcebf3;border-radius:14px;overflow:hidden;box-shadow:0 4px 18px #174b7807}.card-body{padding:21px}.card h3{margin-bottom:9px}.card p{color:#526d83;font-size:15px;margin-bottom:11px}.card .read-link{font-weight:700;font-size:14px}.strip{background:#eaf7fc;border-block:1px solid #dcebf3;padding:38px 0}.split{display:grid;grid-template-columns:1.2fr .8fr;gap:34px;align-items:center}.split.reverse{grid-template-columns:.8fr 1.2fr}.pill-list{display:flex;flex-wrap:wrap;gap:10px}.pill-list a,.pill-list span{display:inline-block;background:white;border:1px solid #dcebf3;padding:7px 14px;border-radius:999px;font-size:14px}.topic-index{display:grid;grid-template-columns:repeat(2,1fr);gap:13px}.topic-index a{padding:15px 18px;background:#fff;border:1px solid #dcebf3;border-radius:10px;font-weight:700;color:#173b60}.topic-index a small{display:block;color:#687f93;font-weight:400;line-height:1.6}.page-intro{background:linear-gradient(120deg,#eaf7fc,#fff);padding:43px 0 36px;border-bottom:1px solid #dcebf3}.page-intro p{font-size:17px;max-width:800px}.breadcrumb{font-size:13px;color:#687f93;margin-bottom:18px}.breadcrumb a{color:#687f93}.article{max-width:810px;margin-inline:auto}.article p{line-height:1.85}.article h2{margin-top:35px}.article h3{margin-top:24px}.content-layout{display:grid;grid-template-columns:minmax(0,810px) minmax(210px,1fr);gap:36px;align-items:start}.aside-card{background:#fff;padding:20px;border:1px solid #dcebf3;border-radius:14px;position:sticky;top:95px}.aside-card a{display:block;padding:7px 0;border-bottom:1px solid #eaf7fc}.highlight-panel{border-left:4px solid #25b6e8;background:#eaf7fc;padding:21px 24px;margin:25px 0;border-radius:0 12px 12px 0}.highlight-panel p:last-child{margin:0}.feature-block{background:#fff;border:1px solid #dcebf3;border-radius:14px;padding:25px;margin:20px 0}.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.three-col{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px}.fact{background:#fff;border:1px solid #dcebf3;border-radius:12px;padding:22px}.fact strong{color:#173b60;font-size:18px}.fact p{margin-top:9px;margin-bottom:0}.table-scroll{overflow-x:auto;border-radius:12px;border:1px solid #dcebf3;margin:20px 0}table{border-collapse:collapse;width:100%;background:#fff;min-width:530px}th,td{text-align:left;vertical-align:top;padding:14px 17px;border-bottom:1px solid #dcebf3}th{background:#eaf7fc;color:#173b60}tr:last-child td{border-bottom:0}.numbered{counter-reset:step;list-style:none;padding:0}.numbered li{counter-increment:step;padding:18px 20px 18px 59px;background:#fff;border:1px solid #dcebf3;border-radius:12px;margin-bottom:13px;position:relative}.numbered li:before{content:counter(step);position:absolute;left:19px;top:16px;background:#25b6e8;color:#fff;width:27px;height:27px;text-align:center;line-height:27px;border-radius:50%;font-weight:800}.related{margin-block:46px;padding-top:20px;border-top:1px solid #dcebf3}.related-links{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related-links a{background:#fff;padding:16px;border-radius:10px;border:1px solid #dcebf3;font-weight:700}.faq details{border:1px solid #dcebf3;background:#fff;border-radius:10px;margin:10px 0;padding:13px 17px}.faq summary{cursor:pointer;color:#173b60;font-weight:700}.faq p{margin:11px 0 0}.site-footer{background:#123653;color:#eaf7ff;margin-top:62px;padding-top:42px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:50px}.footer-name{font-size:23px;font-weight:800;color:#fff;margin-bottom:15px}.footer-name small{display:block;font-size:11px;letter-spacing:.2em;color:#92cfe8}.site-footer p{max-width:690px;color:#d5e8f3;font-size:14px}.fineprint{font-size:12px!important;color:#c1d6e4!important}.site-footer strong{color:#fff}.footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:14px}.site-footer a{color:#eaf7ff;font-size:14px}.footer-bottom{margin-top:28px;border-top:1px solid #ffffff26;padding-block:17px;font-size:12px;color:#bdd5e5;display:flex;justify-content:space-between;gap:20px}.bottom-nav{display:none}.back-top{position:fixed;right:22px;bottom:25px;display:none;width:40px;height:40px;background:#1787db;border:0;border-radius:50%;color:#fff;z-index:40;font-weight:800;box-shadow:0 3px 14px #12365335}.back-top.visible{display:block}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #25b6e8;outline-offset:3px}@media(max-width:1080px){.desktop-nav{gap:11px}.desktop-nav a{font-size:13px}.header-inner{gap:15px}}@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:flex}.header-inner{justify-content:space-between;min-height:60px}.logo{position:absolute;left:50%;transform:translateX(-50%)}.logo img{height:29px;max-width:132px}.logo-text{font-size:20px}.header-action{height:39px;padding:0 13px;font-size:13px}.content-layout{grid-template-columns:1fr}.aside-card{position:static}.hero-layout{gap:22px}.card-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:640px){body{font-size:15px}.container{width:calc(100% - 32px)}h1{font-size:29px}h2{font-size:22px}h3{font-size:18px}.page-intro{padding:28px 0}.page-intro p,.hero-lead{font-size:15px}.section{margin-block:30px}.hero{padding:27px 0}.hero-layout,.split,.split.reverse,.two-col,.three-col,.footer-grid{grid-template-columns:1fr}.hero-art{order:-1;min-height:0}.media-hero{height:205px}.media-landscape{height:160px}.media-portrait{height:240px}.card-grid{grid-template-columns:1fr}.card-body{padding:18px}.section-head{display:block}.topic-index{grid-template-columns:1fr}.related-links{grid-template-columns:1fr}.footer-bottom{display:block}.footer-bottom span{display:block}.site-footer{margin-top:38px;padding-bottom:67px}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:white;border-top:1px solid #dcebf3;z-index:55;text-align:center;padding:8px 0 max(8px,env(safe-area-inset-bottom))}.bottom-nav a{font-size:13px;color:#174b78;font-weight:700}.back-top{bottom:78px;right:14px}.header-inner{min-height:59px}.page-intro .breadcrumb{margin-bottom:10px}.feature-block{padding:18px}.content-layout{gap:20px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
