@charset "UTF-8";
:root{--bg:#F5FBFF;--white:#fff;--soft:#EAF7FC;--light:#DFF5FB;--mint:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#173B60;--text:#2D4359;--muted:#687F93;--line:#DCEBF3;--foot:#123653;--width:1160px;--shadow:0 12px 36px rgba(23,75,120,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:85px}body{margin:0;background:var(--bg);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);font-size:16px;line-height:1.8}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 var(--mint);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%}.wrap{max-width:var(--width);margin:0 auto;padding-left:24px;padding-right:24px}.skip-link{position:absolute;top:-100px;left:16px;padding:6px 14px;background:var(--navy);color:white;z-index:110}.skip-link:focus{top:6px}.site-header{height:72px;background:white;border-bottom:1px solid 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.mobile-drawer{visibility:visible;transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid var(--line)}.drawer-logo{max-height:34px;max-width:160px;object-fit:contain}.close-button{font-size:31px;line-height:1;color:var(--heading);border:0;background:var(--soft);height:36px;width:36px;border-radius:50%}.mobile-drawer nav{display:flex;flex-direction:column}.mobile-drawer nav a{font-weight:700;color:var(--heading);border-bottom:1px solid var(--line);padding:10px 9px}.drawer-label{font-size:12px;color:var(--blue);letter-spacing:.08em;font-weight:800;margin-top:19px}.drawer-foot{margin-top:25px;font-size:13px;color:var(--muted)}.section{margin-top:48px;margin-bottom:50px}.section-head{max-width:820px;margin-bottom:22px}.eyebrow{display:block;color:#137AA8;font-weight:800;letter-spacing:.1em;font-size:12px;text-transform:uppercase;line-height:1.5;margin-bottom:9px}h1,h2,h3,h4{font-weight:800;color:var(--heading);line-height:1.38;margin-top:0}h1{font-size:38px;letter-spacing:-.02em;margin-bottom:18px}h2{font-size:26px;margin-bottom:16px}h3{font-size:19px;margin-bottom:11px}p{margin:0 0 15px}.lead{font-size:17px;color:#47677E}.section-head p{color:var(--muted)}.hero{padding-top:44px;padding-bottom:22px}.hero-layout{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:44px}.hero-copy{padding:18px 0}.hero-copy p{max-width:570px}.hero-actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}.outline-btn{display:inline-flex;align-items:center;padding:8px 19px;border:1px solid #A8D8E9;border-radius:99px;font-weight:700;color:var(--navy);background:white}.outline-btn:hover{text-decoration:none;background:var(--soft)}.media{width:100%;aspect-ratio:var(--media-ratio,16/9);display:flex;align-items:center;justify-content:center;background:linear-gradient(145deg,#EAF7FC,#DFF5FB);border:1px solid var(--line);border-radius:17px;overflow:hidden}.media img{width:auto;height:auto;max-width:100%;max-height:100%;display:block;object-fit:contain;object-position:center}.media-placeholder{height:100%;width:100%;display:flex;align-items:center;justify-content:center;background:radial-gradient(circle at 25% 20%,rgba(37,200,209,.12),transparent 45%),linear-gradient(125deg,#EAF7FC,#DFF5FB)}.placeholder-shape{width:29%;aspect-ratio:1;border:3px solid 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h2{margin:35px 0 14px}.article-body h3{margin:26px 0 11px}.article-body p,.article-body li{line-height:1.85}.article-body ul,.article-body ol{padding-left:23px}.article-body li{margin-bottom:7px}.aside-note{padding:20px 23px;background:var(--soft);border-left:4px solid var(--mint);border-radius:0 12px 12px 0;margin:28px 0}.wide-panel{background:white;border:1px solid var(--line);border-radius:16px;padding:26px;margin-top:20px}.wide-panel h2{margin-bottom:15px}.two-column{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(230px,.7fr);gap:34px;align-items:start}.sticky-index{position:sticky;top:94px;border-radius:14px;background:#fff;border:1px solid var(--line);padding:22px}.sticky-index h2{font-size:18px}.sticky-index a{display:block;padding:7px 0;border-bottom:1px solid var(--line)}.timeline{border-left:3px solid #8DD9E5;padding-left:27px;margin:20px 0}.timeline-item{position:relative;margin-bottom:29px}.timeline-item:before{content:"";width:12px;height:12px;background:var(--blue);border:3px solid white;box-shadow:0 0 0 1px var(--sky);border-radius:50%;position:absolute;left:-35px;top:5px}.comparison{width:100%;border-collapse:collapse;background:white;border-radius:10px;overflow:hidden;font-size:15px}.comparison th{background:#DFF5FB;color:var(--heading);text-align:left}.comparison th,.comparison td{padding:12px 14px;border:1px solid var(--line);vertical-align:top}.table-scroll{overflow-x:auto;border-radius:12px}.accent-label{display:inline-block;padding:4px 11px;border-radius:40px;background:var(--soft);color:#107e98;font-size:13px;font-weight:800}.rule-steps{counter-reset:rule;display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:25px 0}.rule-step{background:white;border:1px solid var(--line);border-radius:12px;padding:21px}.rule-step:before{counter-increment:rule;content:counter(rule,decimal-leading-zero);display:block;font-size:27px;color:var(--sky);font-weight:800;margin-bottom:13px}.rule-step h3{font-size:17px}.rule-step p{font-size:14px;color:var(--muted)}.faq-list details{background:#fff;border:1px solid var(--line);padding:16px 20px;margin:9px 0;border-radius:10px}.faq-list summary{font-weight:800;color:var(--heading);cursor:pointer}.faq-list details p{margin:10px 0 0}.icon-line{display:flex;gap:13px;align-items:baseline;padding:12px 0;border-bottom:1px solid var(--line)}.icon-line strong{min-width:110px;color:var(--heading)}.site-footer{background:var(--foot);color:#EAF7FF;margin-top:70px;padding:42px 0 0}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:38px}.footer-brand{display:inline-block;margin-bottom:13px}.footer-logo{height:auto;max-height:37px;max-width:180px;object-fit:contain}.site-footer .brand-fallback{color:white}.site-footer p{color:#C6DFEF;font-size:14px;max-width:430px}.site-footer h2{color:white;font-size:16px;margin-bottom:14px}.site-footer nav{display:grid;gap:7px}.site-footer nav a{color:#D8EDFA;font-size:14px}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:30px;padding-top:18px;padding-bottom:18px;border-top:1px solid rgba(255,255,255,.16);font-size:12px;color:#C6DFEF}.mobile-bottom{display:none}.back-top{position:fixed;right:21px;bottom:24px;border:0;background:var(--blue);color:white;width:42px;height:42px;border-radius:50%;opacity:0;pointer-events:none;z-index:22;box-shadow:var(--shadow)}.back-top.visible{opacity:1;pointer-events:auto}
@media(max-width:1130px){.desktop-nav a{font-size:13px;padding:8px 6px}.header-inner{gap:13px}.brand{min-width:100px}}@media(max-width:980px){.site-header{height:60px}.header-inner{display:grid;grid-template-columns:1fr auto 1fr;gap:8px}.menu-button{display:flex;justify-self:start}.desktop-nav{display:none}.brand{justify-self:center;min-width:0;max-width:170px;height:50px}.brand-logo{max-height:30px}.header-cta{justify-self:end;height:40px;font-size:13px;padding:0 13px}.hero-layout{gap:24px}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;padding:5px max(7px,env(safe-area-inset-right)) calc(5px + env(safe-area-inset-bottom));background:rgba(255,255,255,.98);z-index:37;border-top:1px solid var(--line)}.mobile-bottom a{font-size:11px;font-weight:700;text-align:center;color:var(--navy);line-height:1.4}.mobile-bottom a[aria-current=page]{color:var(--blue)}.mobile-bottom a span{display:block;font-size:20px}.site-footer{padding-bottom:75px}.back-top{bottom:90px}}@media(max-width:690px){.wrap{padding-left:16px;padding-right:16px}.hero{padding-top:20px}.hero-layout,.feature-grid,.two-column,.band{grid-template-columns:1fr}.hero-media{grid-row:1;min-height:0}.hero-copy{grid-row:2}.hero h1{font-size:29px}.article-hero{padding-top:27px;padding-bottom:25px}.article-hero h1{font-size:27px}h2{font-size:22px}h3{font-size:18px}.lead{font-size:16px}.section{margin-top:30px;margin-bottom:32px}.card-grid,.card-grid.cols-2,.rule-steps{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:22px}.footer-grid>div:first-child{grid-column:1/-1}.footer-bottom{flex-direction:column;gap:0}.band{gap:20px;padding:20px}.wide-panel{padding:20px}.sticky-index{position:static}.comparison{font-size:13px}.comparison th,.comparison td{padding:10px}.media{border-radius:12px}.brand-fallback{font-size:21px}.section-head{margin-bottom:17px}.site-footer{margin-top:46px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
