*{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}body.menu-open{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{color:#1787db}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #25b6e8;outline-offset:3px}img{max-width:100%;height:auto}.wrap{width:min(100% - 48px,1160px);margin-inline:auto}.skip-link{position:absolute;top:-80px;left:20px;background:#fff;z-index:100;padding:8px}.skip-link:focus{top:8px}.site-header{height:72px;background:#fff;position:sticky;top:0;z-index:30;border-bottom:1px solid #dcebf3;box-shadow:0 3px 22px #174b780a}.header-inner{height:100%;display:flex;align-items:center;gap:27px}.brand{display:flex;align-items:center;flex-shrink:0;min-width:145px;color:#174b78}.brand img{display:block;max-height:38px;width:auto;object-fit:contain}.brand-glyph{display:grid;place-items:center;background:linear-gradient(120deg,#25c8d1,#1787db);border-radius:50%;color:white;width:37px;height:37px;margin-right:9px;font-size:27px}.brand-words{font-size:20px;font-weight:900;line-height:1.05}.brand-words small,.footer-brand small{display:block;font-size:9px;letter-spacing:1.5px;font-weight:700}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:clamp(10px,1.5vw,22px);margin-left:auto}.nav-link{white-space:nowrap;font-size:14px;font-weight:650;color:#174b78;padding:22px 0;border-bottom:3px solid transparent}.nav-link:hover,.nav-link.is-active{color:#1787db;border-bottom-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!important;font-weight:700;text-decoration:none;white-space:nowrap;box-shadow:0 7px 18px #1787db22}.main-btn:hover{filter:brightness(.94)}.header-cta{margin-left:auto;font-size:14px}.menu-toggle{display:none}.menu-overlay{position:fixed;inset:0;z-index:40;background:#1236538a;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.menu-overlay.open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{position:fixed;inset:0 auto 0 0;width:min(86vw,340px);z-index:41;background:white;box-shadow:15px 0 50px #12365322;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .22s,visibility .22s;overflow-y:auto;padding:18px 22px 28px}.mobile-drawer.open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;justify-content:space-between;align-items:center;color:#173b60;font-size:20px}.menu-close{border:0;background:#eaf7fc;border-radius:50%;width:38px;height:38px;font-size:27px;color:#174b78}.drawer-group{border-top:1px solid #dcebf3;margin-top:20px;padding-top:14px;display:grid;gap:7px}.drawer-group span{font-size:12px;letter-spacing:1px;color:#1787db;font-weight:800}.drawer-group a{padding:8px 0;color:#2d4359}.bottom-nav{display:none}.back-top{position:fixed;bottom:25px;right:24px;z-index:20;width:44px;height:44px;border:0;border-radius:50%;background:#1787db;color:#fff;font-size:23px;opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s;box-shadow:0 6px 20px #1787db33}.back-top.visible{opacity:1;pointer-events:auto;transform:translateY(0)}.eyebrow{text-transform:uppercase;letter-spacing:2px;color:#1787db;font-size:12px;font-weight:900}.hero{padding:50px 0 40px;background:radial-gradient(ellipse at 86% 18%,#d9f6ff 0,transparent 55%),linear-gradient(135deg,#fff,#eaf7fc)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:44px;align-items:center}.hero h1{font-size:clamp(30px,3.4vw,40px);line-height:1.35;color:#173b60;margin:12px 0 18px}.hero p{font-size:17px;max-width:620px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.outline-btn{border:1px solid #9bdce8;background:#fff;color:#174b78;border-radius:999px;padding:9px 22px;font-weight:700}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:#eaf7fc;border-radius:16px;border:1px solid #dcebf3;min-height:180px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{position:relative;overflow:hidden;width:100%;height:100%;min-height:inherit;background:linear-gradient(135deg,#eaf7fc 0%,#dff5fb 55%,#c8e7f8 100%)}.placeholder-circle{position:absolute;width:48%;aspect-ratio:1;border:25px solid #ffffff8f;border-radius:50%;right:9%;top:15%;box-shadow:0 0 0 20px #25b6e810}.placeholder-grid{position:absolute;width:95%;height:80%;left:8%;top:18%;background:repeating-linear-gradient(0deg,transparent,transparent 25px,#1787db11 26px),repeating-linear-gradient(90deg,transparent,transparent 25px,#1787db11 26px);transform:skewY(-8deg)}.hero-media{height:312px}.topic-media{height:234px}.feature-media{height:185px}.wide-media{height:255px}.phone-media{height:275px}.section{padding:48px 0}.section-tint{background:#eaf7fc}.section-title{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:25px}.section-title h2{color:#173b60;margin:5px 0;font-size:26px;line-height:1.4}.section-title p{margin:5px 0;font-size:14px;max-width:520px}.text-link{font-size:14px;color:#1787db;font-weight:800;white-space:nowrap}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.feature-card,.info-card{background:#fff;border:1px solid #dcebf3;border-radius:16px;overflow:hidden;box-shadow:0 8px 28px #174b7809}.feature-card .card-body,.info-card{padding:22px}.feature-card h3,.info-card h3{font-size:19px;color:#173b60;margin:6px 0 10px;line-height:1.5}.feature-card p,.info-card p{font-size:15px;margin:0 0 12px}.tag{display:inline-block;color:#1787db;font-size:12px;font-weight:800;letter-spacing:.5px}.feature-card a.more,.info-card a.more{font-size:14px;color:#1787db;font-weight:800}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}.two-col.text-first{grid-template-columns:1.1fr .9fr}.two-col h2,.editorial h2{font-size:25px;color:#173b60;line-height:1.4}.muted{color:#687f93}.mini-index{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.mini-index a{padding:15px 18px;border:1px solid #dcebf3;border-radius:10px;background:#fff;color:#174b78;font-weight:700}.mini-index a:hover{border-color:#25c8d1}.link-strip{display:flex;gap:12px;flex-wrap:wrap}.link-strip a{border:1px solid #c9e5f1;color:#174b78;border-radius:999px;padding:7px 16px;font-size:13px;font-weight:700}.page-banner{background:linear-gradient(120deg,#eaf7fc,#fff 55%,#dff5fb);padding:52px 0 38px;border-bottom:1px solid #dcebf3}.page-banner h1{font-size:34px;color:#173b60;line-height:1.35;margin:9px 0 13px}.page-banner p{max-width:800px;margin:0;font-size:17px}.breadcrumbs{font-size:13px;color:#687f93}.breadcrumbs a{color:#1787db}.article-layout{display:grid;grid-template-columns:minmax(0,780px) minmax(210px,1fr);gap:42px;padding-top:45px;padding-bottom:50px}.article{min-width:0}.article h2{font-size:25px;line-height:1.4;margin:42px 0 16px;color:#173b60}.article h2:first-child{margin-top:0}.article h3{font-size:19px;line-height:1.5;margin:25px 0 10px;color:#174b78}.article p{margin:0 0 18px}.article li{margin-bottom:10px}.article blockquote{margin:24px 0;padding:15px 22px;background:#eaf7fc;border-left:4px solid #25c8d1;color:#174b78;font-weight:600}.article .media{margin:24px 0}.sidebar{align-self:start;position:sticky;top:95px;padding:23px;border-radius:15px;border:1px solid #dcebf3;background:#fff}.sidebar h3{margin:0 0 13px;color:#173b60}.sidebar a{display:block;border-top:1px solid #e4f0f5;padding:10px 0;font-size:14px;color:#174b78}.comparison{width:100%;border-collapse:collapse;margin:20px 0 25px;font-size:14px}.comparison th{background:#dff5fb;color:#173b60;text-align:left}.comparison th,.comparison td{border:1px solid #dcebf3;padding:12px 15px;vertical-align:top}.comparison tr:nth-child(even) td{background:#f5fbff}.numbered{counter-reset:section;list-style:none;padding:0}.numbered li{position:relative;padding:8px 0 16px 48px;border-bottom:1px solid #dcebf3}.numbered li::before{counter-increment:section;content:counter(section,decimal-leading-zero);position:absolute;left:0;top:8px;font-size:16px;font-weight:900;color:#1787db}.quote-band{background:#123653;color:#eaf7ff;padding:36px;border-radius:18px}.quote-band h2{color:white;margin:0 0 10px}.quote-band p{max-width:850px;margin:0}.timeline{border-left:2px solid #25b6e8;padding-left:23px}.timeline>div{position:relative;padding:0 0 22px}.timeline>div::before{content:'';position:absolute;width:12px;height:12px;border-radius:50%;background:#25c8d1;left:-30px;top:8px}.timeline h3{margin:0 0 6px;color:#173b60}.related{margin:42px 0 15px;border-top:2px solid #dcebf3;padding-top:22px}.related strong{color:#173b60}.related-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.related a{border:1px solid #dcebf3;background:#fff;border-radius:10px;padding:9px 14px;color:#174b78;font-size:14px}.related a span{color:#1787db;margin-left:12px}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.topic-list>div{background:#fff;border:1px solid #dcebf3;border-radius:12px;padding:20px}.topic-list h3{margin:0 0 8px;color:#173b60}.topic-list p{margin:0;font-size:15px}.gallery-cards{display:grid;grid-template-columns:1.15fr .85fr;gap:20px}.gallery-cards .media{height:235px}.faq details{border-bottom:1px solid #dcebf3;padding:13px 0}.faq summary{cursor:pointer;font-weight:700;color:#173b60}.faq details p{margin:9px 0 5px;font-size:15px}.notice{background:#eaf7fc;border:1px solid #b7e9f1;border-radius:12px;padding:18px 21px;margin:20px 0}.notice strong{color:#174b78}.site-footer{background:#123653;color:#eaf7ff;padding:48px 0 20px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:50px}.footer-brand{font-size:23px;font-weight:900;color:#fff}.footer-intro p{max-width:440px;color:#cfdfeb;font-size:14px}.footer-note{opacity:.8}.footer-grid>div:not(:first-child){display:flex;flex-direction:column;gap:10px}.footer-grid strong{color:#fff;margin-bottom:7px}.footer-grid a{font-size:14px;color:#cfe4f2}.footer-grid a:hover{color:#fff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #ffffff2b;padding-top:17px;margin-top:36px;font-size:12px;color:#bcd1df}@media(max-width:1100px){.desktop-nav{gap:10px}.nav-link{font-size:13px}.header-inner{gap:15px}}@media(max-width:980px){.site-header{height:60px}.header-inner{justify-content:space-between;position:relative}.desktop-nav{display:none}.menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;background:transparent;border:0;width:40px;height:40px;padding:8px}.menu-toggle span{display:block;height:2px;width:23px;border-radius:2px;background:#174b78}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0}.brand img{max-height:30px;max-width:160px}.brand-glyph{width:28px;height:28px}.brand-words{font-size:16px}.brand-words small{font-size:7px}.header-cta{margin-left:auto;height:39px;padding:0 12px;font-size:12px}.hero-grid{gap:24px}.article-layout{grid-template-columns:1fr}.sidebar{position:static;display:none}.article{max-width:820px}}@media(max-width:700px){.wrap{width:calc(100% - 32px)}body{font-size:15px;line-height:1.8}.hero{padding:30px 0}.hero-grid,.two-col,.two-col.text-first,.gallery-cards{grid-template-columns:1fr;gap:22px}.hero h1{font-size:29px}.hero p,.page-banner p{font-size:15px}.hero-media{height:210px}.card-grid{grid-template-columns:1fr}.section{padding:32px 0}.section-title{display:block}.section-title h2{font-size:22px}.section-title .text-link{display:inline-block;margin-top:8px}.topic-media,.wide-media{height:195px}.feature-media{height:175px}.page-banner{padding:30px 0}.page-banner h1{font-size:27px}.article-layout{padding-top:29px;padding-bottom:30px}.article h2{font-size:21px;margin-top:30px}.article h3{font-size:18px}.topic-list,.mini-index{grid-template-columns:1fr}.comparison{font-size:12px}.comparison th,.comparison td{padding:8px 7px}.quote-band{padding:24px}.footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-intro{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-bottom:6px}.site-footer{padding-bottom:80px}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;height:58px;background:#fff;border-top:1px solid #dcebf3;z-index:25;box-shadow:0 -3px 14px #174b7812}.bottom-nav a{display:grid;place-items:center;font-size:13px;font-weight:700;color:#174b78}.bottom-nav a[aria-current]{color:#1787db}.back-top{bottom:73px;right:16px}.header-cta{min-width:0}.brand img{max-width:116px}.brand-words small{letter-spacing:.3px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}
