@charset "UTF-8";
:root{--bg:#f5fbff;--white:#fff;--light:#eaf7fc;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--ink:#173b60;--body:#2d4359;--muted:#687f93;--line:#dcebf3;--footer:#123653;--shadow:0 18px 60px 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(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button{font:inherit}img{max-width:100%}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--ink);line-height:1.35}h1{font-size:clamp(28px,3.4vw,40px);letter-spacing:-.035em}h2{font-size:26px}h3{font-size:19px}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;top:-100px;left:20px;z-index:100;background:#fff;padding:6px 14px}.skip-link:focus{top:10px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:35}.header-inner{height:72px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;flex-shrink:0;gap:9px;color:var(--ink);line-height:1.1;min-width:166px}.brand img{max-height:38px;max-width:170px;width:auto;height:auto;object-fit:contain}.brand-icon{display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:linear-gradient(140deg,var(--cyan),var(--blue));color:#fff;font-weight:800;font-size:24px}.brand-copy b{display:block;font-size:19px}.brand-copy small{display:block;font-size:9px;letter-spacing:1.4px;margin-top:5px;color:var(--blue)}.desktop-nav{display:flex;align-items:center;gap:clamp(8px,1.5vw,24px);margin:auto;white-space:nowrap}.desktop-nav a{font-size:14px;font-weight:600;transition:color .2s}.desktop-nav a:hover,.desktop-nav .active{color:var(--blue)}.main-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;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 25px rgba(23,135,219,.18);transition:transform .2s,filter .2s}.main-btn:hover{transform:translateY(-2px);filter:brightness(1.04)}.header-cta{font-size:14px}.menu-toggle{display:none;border:0;background:none;padding:8px;width:40px;height:40px;cursor:pointer}.menu-toggle span{display:block;background:var(--ink);width:23px;height:2px;border-radius:2px;margin:5px auto}.drawer-backdrop{position:fixed;inset:0;background:rgba(5,34,59,.5);z-index:45;visibility:hidden;pointer-events:none}.drawer-backdrop.is-open{visibility:visible;pointer-events:auto}.drawer{position:fixed;z-index:46;top:0;bottom:0;left:0;width:min(340px,86vw);overflow-y:auto;background:white;padding:22px;box-shadow:10px 0 50px #12365326;transform:translateX(-105%);visibility:hidden;transition:transform .25s,visibility .25s}.drawer.is-open{transform:none;visibility:visible}.drawer-top{display:flex;justify-content:space-between;align-items:center}.drawer-title{font-weight:800;font-size:23px;color:var(--ink)}#drawer-close{border:0;background:var(--light);color:var(--ink);font-size:26px;border-radius:50%;width:38px;height:38px;cursor:pointer}.drawer-tag{color:var(--muted);font-size:13px;margin:8px 0 24px}.drawer-group{border-top:1px solid var(--line);padding:16px 0}.drawer-group small{display:block;color:var(--blue);font-weight:700;margin-bottom:6px}.drawer-group a{display:block;padding:7px 5px;color:var(--ink)}body.drawer-open{overflow:hidden}.hero{padding:68px 0 44px;position:relative;overflow:hidden}.hero:before{content:"";position:absolute;width:550px;height:550px;border-radius:50%;background:radial-gradient(circle,#b4effa80,transparent 70%);right:-130px;top:-220px;pointer-events:none}.hero-grid{display:grid;grid-template-columns:1.03fr .97fr;align-items:center;gap:60px;position:relative}.eyebrow{color:var(--blue);font-size:12px;letter-spacing:2px;font-weight:800;text-transform:uppercase;display:block;margin-bottom:13px}.hero h1{max-width:650px;margin-bottom:23px}.hero p{font-size:17px;max-width:560px;color:#536c80}.hero-actions{display:flex;gap:13px;flex-wrap:wrap;margin:25px 0}.text-btn{display:inline-flex;align-items:center;justify-content:center;padding:0 20px;height:42px;border:1px solid #b6dce9;border-radius:25px;color:var(--navy);font-weight:700;background:#ffffffc7}.hero-micro{font-size:12px!important;color:var(--muted)!important}.media{display:flex;align-items:center;justify-content:center;width:100%;overflow:hidden;background:linear-gradient(135deg,#e1f8fd,#d9effc);border:1px solid #dceff7;border-radius:18px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.hero-media{height:320px;box-shadow:var(--shadow)}.hero-media img{max-height:320px}.media-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:10px;color:#3783a2;background:radial-gradient(circle at 27% 30%,#ffffffb0,transparent 43%),linear-gradient(135deg,#daf6fa,#cae7fa)}.media-placeholder span{font-size:80px;line-height:1;color:#48bbd4}.media-placeholder small{font-size:13px;font-weight:600;letter-spacing:1px}.section{padding:42px 0}.section-title{max-width:740px;margin-bottom:26px}.section-title h2{margin-bottom:8px}.section-title p{color:var(--muted);margin:0}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.topic-card{display:flex;flex-direction:column;padding:23px;background:#fff;border:1px solid var(--line);border-radius:15px;min-height:215px;transition:transform .2s,box-shadow .2s}.topic-card:hover,.topic-link:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.topic-card .number{color:var(--sky);font-size:13px;font-weight:800;letter-spacing:2px}.topic-card h3{margin:15px 0 8px}.topic-card p{font-size:14px;color:var(--muted);margin-bottom:10px}.topic-card .more{color:var(--blue);font-size:13px;font-weight:800;margin-top:auto}.feature{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center;padding:30px;background:#fff;border:1px solid var(--line);border-radius:18px}.feature .media{height:240px}.feature .media img{max-height:240px}.feature p{color:var(--muted)}.pill-row{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0}.pill{border:1px solid var(--line);border-radius:30px;padding:5px 12px;font-size:12px;color:var(--navy);background:var(--light)}.topic-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.topic-link{background:#fff;border:1px solid var(--line);border-radius:12px;padding:17px 48px 17px 19px;position:relative;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}.topic-link strong{color:var(--ink);font-size:17px}.topic-link span:not(.arrow){font-size:13px;color:var(--muted)}.topic-link .arrow{position:absolute;right:20px;top:19px;color:var(--blue)}.page-hero{padding:57px 0 38px;background:linear-gradient(130deg,#f4fcff 50%,#def4fa 100%);border-bottom:1px solid var(--line)}.page-hero .container{max-width:1160px}.page-hero h1{font-size:clamp(25px,3vw,34px);max-width:890px;margin-bottom:14px}.page-hero p{max-width:760px;color:#527088;font-size:17px;margin:0}.breadcrumb{font-size:12px;color:var(--muted);margin-bottom:22px}.breadcrumb a:hover{color:var(--blue)}.content-layout{display:grid;grid-template-columns:minmax(0,800px) minmax(200px,1fr);align-items:start;gap:42px;padding-top:36px;padding-bottom:52px}.article-body{min-width:0}.article-body p{margin-bottom:18px}.article-body h2{font-size:25px;margin:43px 0 16px;padding-left:14px;border-left:4px solid var(--cyan)}.article-body h3{margin:27px 0 10px}.article-body ul,.article-body ol{padding-left:24px;margin-bottom:24px}.article-body li{margin-bottom:8px}.article-body .media{height:235px;margin:22px 0 28px}.article-body .media img{max-height:235px}.side-panel{position:sticky;top:96px;border:1px solid var(--line);border-radius:15px;background:#fff;padding:21px}.side-panel h2{font-size:17px}.side-panel a{display:block;border-top:1px solid var(--line);padding:11px 0;font-size:14px;color:var(--navy)}.side-panel a:hover{color:var(--blue)}.info-box,.note{background:#eaf7fc;border-left:4px solid var(--sky);border-radius:9px;padding:18px 20px;margin:24px 0;color:#335c74}.info-box strong{color:var(--ink)}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:25px 0}.compare-card{padding:22px;background:#fff;border:1px solid var(--line);border-radius:13px}.compare-card h3{margin-top:0}.compare-card ul{font-size:15px;margin:0}.data-table{width:100%;border-collapse:collapse;margin:22px 0 26px;background:#fff;font-size:14px}.data-table th,.data-table td{border:1px solid var(--line);padding:11px 13px;text-align:left;vertical-align:top}.data-table th{background:#eaf7fc;color:var(--ink)}.steps{counter-reset:steps;list-style:none!important;padding-left:0!important;display:grid;gap:15px}.steps li{position:relative;padding:18px 18px 18px 60px;background:white;border:1px solid var(--line);border-radius:12px;margin:0!important}.steps li:before{counter-increment:steps;content:counter(steps);position:absolute;left:17px;top:18px;width:28px;height:28px;background:var(--blue);border-radius:50%;color:#fff;text-align:center;line-height:28px;font-weight:800}.related{border-top:1px solid var(--line);margin-top:44px;padding-top:18px}.related h2{border:0;padding:0;margin-top:16px;font-size:21px}.related .topic-list{grid-template-columns:1fr 1fr}.faq-item{background:#fff;border:1px solid var(--line);border-radius:11px;padding:15px 20px;margin:12px 0}.faq-item h3{font-size:16px;margin:0 0 7px}.faq-item p{font-size:14px;margin:0}.site-footer{background:var(--footer);color:#eaf7ff;padding-top:46px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:60px}.footer-brand{font-weight:800;font-size:23px;color:#fff}.footer-brand small{font-size:10px;letter-spacing:1.5px;display:block;color:#83dcec;margin-top:-4px}.footer-about p{max-width:450px;font-size:14px;color:#bfd9e9}.footer-about .adult{font-size:12px;color:#8fb5c9}.footer-links h2{font-size:15px;color:#fff}.footer-links a{display:block;color:#c4dce9;font-size:13px;padding:3px 0}.footer-links a:hover{color:white}.footer-bottom{border-top:1px solid #ffffff25;margin-top:38px;padding:16px 0;display:flex;justify-content:space-between;font-size:12px;color:#adc9dc}.bottom-nav{display:none}
@media(max-width:1100px){.desktop-nav{gap:9px}.desktop-nav a{font-size:13px}.brand{min-width:148px}.header-inner{gap:13px}}
@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:block}.header-inner{justify-content:space-between;height:60px}.brand{min-width:0;position:absolute;left:50%;transform:translateX(-50%)}.brand img{max-height:30px;max-width:120px}.brand-icon{width:28px;height:28px;font-size:19px}.brand-copy b{font-size:16px}.brand-copy small{font-size:7px}.header-cta{margin-left:auto;height:38px;font-size:12px;padding:0 13px;min-width:0}.header-cta span{display:none}.hero-grid{gap:26px}.content-layout{grid-template-columns:minmax(0,1fr) 200px;gap:22px}}
@media(max-width:700px){body{font-size:15px;line-height:1.78}.container{width:calc(100% - 32px)}h2{font-size:22px}.hero{padding:29px 0 24px}.hero-grid{display:flex;flex-direction:column-reverse;align-items:stretch;gap:23px}.hero-media{height:205px}.hero-media img{max-height:205px}.hero h1{font-size:29px}.hero p{font-size:15px}.hero-actions{margin:17px 0}.section{padding:25px 0}.section-title{margin-bottom:20px}.topic-grid{grid-template-columns:repeat(2,1fr);gap:11px}.topic-card{padding:16px;min-height:190px}.topic-card h3{font-size:17px;margin:10px 0 6px}.topic-card p{font-size:13px}.feature{display:flex;flex-direction:column;align-items:stretch;gap:20px;padding:16px}.feature .media{height:170px}.feature .media img{max-height:170px}.topic-list{grid-template-columns:1fr}.page-hero{padding:30px 0}.page-hero h1{font-size:26px}.page-hero p{font-size:15px}.content-layout{display:block;padding-top:18px;padding-bottom:34px}.article-body h2{font-size:21px;margin:34px 0 15px}.article-body h3{font-size:17px}.article-body .media{height:170px}.article-body .media img{max-height:170px}.side-panel{position:static;margin-top:32px}.comparison{grid-template-columns:1fr}.related .topic-list{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:24px}.footer-about{grid-column:1/-1}.site-footer{padding-top:30px;padding-bottom:70px}.footer-bottom{gap:20px;margin-top:20px}.bottom-nav{position:fixed;z-index:34;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);padding:5px 0 max(5px,env(safe-area-inset-bottom))}.bottom-nav a{display:flex;align-items:center;flex-direction:column;gap:0;line-height:1.5;color:var(--muted);font-size:11px}.bottom-nav a span{font-size:20px}.bottom-nav a[aria-current=page]{color:var(--blue)}.media-placeholder span{font-size:55px}.header-cta{font-size:11px;padding:0 11px}}
@media(max-width:380px){.brand-copy small{display:none}.brand-copy b{font-size:14px}.brand{gap:5px}.topic-grid{grid-template-columns:1fr}.topic-card{min-height:0}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}