*{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.drawer-open{overflow:hidden}a{color:#1787db;text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}img{max-width:100%}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;top:-100px;z-index:2000;background:#fff;padding:8px}.skip-link:focus{top:0}.site-header{background:#fff;border-bottom:1px solid #dcebf3;position:relative;z-index:30}.header-inner{height:72px;display:flex;align-items:center;gap:25px}.brand{display:flex;align-items:center;flex:none;min-width:140px;justify-content:flex-start}.brand img{display:block;height:38px;width:auto;max-width:176px;object-fit:contain}.brand-fallback{font-size:25px;font-weight:900;color:#174b78;letter-spacing:1px}.brand-fallback span{color:#25b6e8}.desktop-nav{display:flex;align-items:center;gap:19px;margin-left:auto}.desktop-nav a{font-size:14px;color:#174b78;white-space:nowrap;padding:8px 0;border-bottom:2px solid transparent;font-weight:600}.desktop-nav a:hover,.desktop-nav .is-active{color:#1787db;border-color:#25c8d1;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;text-decoration:none;white-space:nowrap}.main-btn:hover{filter:brightness(1.06);text-decoration:none}.top-entry{margin-left:4px;font-size:14px}.menu-button{display:none;background:transparent;border:0;padding:9px;width:42px;height:42px}.menu-button span{display:block;width:23px;height:2px;background:#174b78;margin:5px auto;border-radius:3px}.drawer-backdrop{position:fixed;inset:0;background:rgba(7,27,46,.55);z-index:55;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.drawer-backdrop.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{position:fixed;top:0;left:0;height:100dvh;width:min(86vw,340px);overflow:auto;z-index:60;transform:translateX(-105%);visibility:hidden;pointer-events:none;background:white;box-shadow:10px 0 40px #07213b44;transition:transform .25s,visibility .25s;padding:19px 22px}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #dcebf3;padding-bottom:15px}.drawer-title{font-size:20px;font-weight:800;color:#173b60}.drawer-close{border:0;background:#eaf7fc;width:38px;height:38px;border-radius:10px;color:#174b78;font-size:28px;line-height:1}.drawer-group{border-bottom:1px solid #e1edf5;padding:16px 0;display:flex;flex-direction:column;gap:4px}.drawer-group strong{font-size:13px;color:#687f93;margin-bottom:4px}.drawer-group a{padding:7px 8px;color:#174b78;border-radius:8px}.drawer-group a.is-active,.drawer-group a:hover{background:#eaf7fc;color:#1787db;text-decoration:none}.eyebrow{font-size:12px;letter-spacing:.16em;font-weight:800;color:#1787db;text-transform:uppercase}.hero{padding:52px 0 34px;display:grid;grid-template-columns:1.04fr .96fr;gap:42px;align-items:center}.hero h1,.page-intro h1{font-size:38px;line-height:1.35;letter-spacing:-.025em;color:#173b60;margin:10px 0 19px}.hero p,.page-intro p{font-size:17px;line-height:1.85;color:#526b82;margin:0 0 18px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.outline-btn{border:1px solid #a7cde7;border-radius:999px;padding:8px 18px;background:white;color:#174b78;font-weight:700}.outline-btn:hover{text-decoration:none;background:#eaf7fc}.media{display:flex;align-items:center;justify-content:center;width:100%;overflow:hidden;background:#eaf7fc;border-radius:14px;border:1px solid #dcebf3}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media--empty{background:linear-gradient(135deg,#e5f8fc,#eaf2fc);position:relative;min-height:120px}.media-pattern{display:block;width:55%;height:55%;border:1px solid #b7e6f0;border-radius:50%;box-shadow:0 0 0 24px #d4f2f777,0 0 0 48px #d2eff555}.hero-media{height:310px}.thumb-media{height:164px}.feature-media{height:220px}.phone-media{height:300px}.phone-media img{max-height:280px}.content-section{padding:30px 0 38px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:22px}.section-head h2,.content-section h2,.related h2{font-size:25px;line-height:1.4;color:#173b60;margin:0 0 12px}.section-head p{color:#687f93;margin:0}.section-head a{white-space:nowrap;font-weight:700}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.topic-card,.story-card,.info-panel,.compare-item,.step-card{background:#fff;border:1px solid #dcebf3;border-radius:15px;padding:23px;box-shadow:0 6px 22px rgba(18,71,104,.035)}.topic-card .number{color:#25b6e8;font-weight:800;letter-spacing:.1em;font-size:13px}.topic-card h3,.story-card h3,.compare-item h3,.step-card h3{font-size:19px;color:#173b60;margin:7px 0 8px;line-height:1.45}.topic-card p,.story-card p,.compare-item p,.step-card p{margin:0;color:#526b82;font-size:15px}.topic-card a{display:inline-block;font-weight:700;margin-top:14px}.story-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:18px}.story-card{padding:0;overflow:hidden}.story-card .story-body{padding:20px}.story-card p{font-size:15px}.story-card a{font-weight:700;display:inline-block;margin-top:10px}.feature-band{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;background:#eaf7fc;border-radius:20px;padding:28px}.feature-band h2{margin:0 0 14px;font-size:25px;color:#173b60}.feature-band p{margin:0 0 13px}.article-index{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.article-index a{display:flex;align-items:center;justify-content:space-between;background:#fff;border:1px solid #dcebf3;padding:15px 18px;border-radius:12px;font-weight:700}.article-index a:hover,.related-list a:hover{text-decoration:none;background:#eaf7fc}.page-intro{padding:43px 0 28px;border-bottom:1px solid #dcebf3}.page-intro h1{font-size:33px;max-width:900px}.page-intro p{max-width:800px}.article-wrap{width:min(820px,calc(100% - 48px));margin-inline:auto}.article-wrap p{margin:0 0 18px}.article-wrap h2{margin:33px 0 14px;font-size:25px;line-height:1.45;color:#173b60}.article-wrap h3{margin:24px 0 11px;font-size:19px;color:#174b78}.article-wrap ul,.article-wrap ol{padding-left:24px;margin:0 0 19px}.article-wrap li{margin-bottom:9px}.article-wrap .media{margin:22px 0 26px}.lede{font-size:18px;color:#365973;border-left:4px solid #25c8d1;padding-left:18px;margin:23px 0!important}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px}.compare-list{display:grid;grid-template-columns:1fr 1fr;gap:18px}.compare-item{padding:24px}.compare-item h3{margin-top:0}.inline-quote{background:#eaf7fc;border-left:4px solid #25b6e8;padding:18px 23px;border-radius:0 12px 12px 0;margin:23px 0;color:#174b78;font-weight:600}.fact-table{border-collapse:collapse;width:100%;margin:20px 0 28px;font-size:15px}.fact-table th,.fact-table td{padding:12px 14px;border:1px solid #dcebf3;text-align:left;vertical-align:top}.fact-table th{background:#eaf7fc;color:#173b60}.fact-table td{background:white}.visual-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:25px;align-items:center;margin:24px 0}.visual-row .media{margin:0}.mini-tag{display:inline-block;color:#1787db;font-size:12px;font-weight:800;letter-spacing:.1em}.timeline{border-left:2px solid #b1e5ee;padding-left:24px;margin:25px 0}.timeline div{position:relative;margin-bottom:24px}.timeline div:before{content:"";position:absolute;width:10px;height:10px;border-radius:50%;background:#25b6e8;left:-30px;top:10px}.timeline h3{margin:0 0 6px}.note{background:#eaf7fc;border:1px solid #dcebf3;border-radius:14px;padding:22px;margin:26px 0}.related{padding:25px 0 46px;margin-top:20px;border-top:1px solid #dcebf3}.related-list{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related-list a{display:flex;align-items:center;justify-content:space-between;background:#fff;border:1px solid #dcebf3;border-radius:11px;padding:14px 16px;font-weight:700}.qa{margin:12px 0;background:white;border:1px solid #dcebf3;border-radius:12px;padding:16px 20px}.qa h3{font-size:17px;margin:0 0 7px}.qa p{margin:0}.site-footer{background:#123653;color:#eaf7ff;margin-top:25px}.footer-layout{display:grid;grid-template-columns:1.5fr .8fr 1fr;gap:56px;padding:44px 0 35px}.footer-brand{display:block;font-size:22px;font-weight:900;color:white}.footer-brand span{display:block;font-size:11px;letter-spacing:.17em;color:#8bd8ed}.footer-about p,.footer-note p{color:#c8dfee;font-size:14px}.footer-about small{font-size:12px;color:#adcadb}.footer-nav{display:flex;flex-direction:column;gap:5px}.footer-nav strong,.footer-note strong{display:block;margin-bottom:8px;color:#fff}.footer-nav a,.footer-note a{color:#c8e6f2;font-size:14px}.footer-bottom{border-top:1px solid #ffffff22;display:flex;justify-content:space-between;gap:16px;padding:15px 0 20px;color:#a6c5d7;font-size:12px}.bottom-nav{display:none}.back-top{position:fixed;right:20px;bottom:22px;border:0;border-radius:50%;width:42px;height:42px;background:#1787db;color:white;opacity:0;pointer-events:none;transition:.2s;box-shadow:0 8px 20px #174b7844}.back-top.is-visible{opacity:1;pointer-events:auto}
@media(max-width:1100px){.desktop-nav{gap:11px}.header-inner{gap:15px}.desktop-nav a{font-size:13px}}
@media(max-width:980px){.desktop-nav{display:none}.menu-button{display:block}.header-inner{height:60px;justify-content:space-between;gap:6px}.brand{min-width:0;position:absolute;left:50%;transform:translateX(-50%);justify-content:center}.brand img{height:29px;max-width:145px}.brand-fallback{font-size:21px}.top-entry{height:39px;padding:0 15px;min-width:0;margin-left:auto;font-size:13px}.hero{gap:25px}.story-grid{grid-template-columns:repeat(2,1fr)}.footer-layout{gap:24px}}
@media(max-width:650px){body{font-size:15px;line-height:1.78;padding-bottom:58px}.wrap,.article-wrap{width:calc(100% - 32px)}.header-inner{height:60px}.hero{padding:25px 0 15px;display:flex;flex-direction:column-reverse;align-items:stretch;gap:18px}.hero h1{font-size:29px;margin:5px 0 13px}.hero p,.page-intro p{font-size:15px}.hero-media{height:205px}.hero-actions{margin-top:17px}.content-section{padding:22px 0}.section-head h2,.content-section h2,.related h2,.article-wrap h2{font-size:21px}.section-head{align-items:start}.section-head>a{font-size:13px}.topic-grid,.story-grid,.article-index,.compare-list,.two-col,.related-list{grid-template-columns:1fr}.topic-grid{gap:12px}.topic-card{padding:17px}.topic-card h3,.story-card h3{font-size:17px}.story-card .story-body{padding:18px}.feature-band{grid-template-columns:1fr;padding:18px;gap:17px}.feature-band h2{font-size:21px}.feature-media{height:175px}.phone-media{height:190px}.phone-media img{max-height:175px}.page-intro{padding:27px 0 20px}.page-intro h1{font-size:26px}.article-wrap h2{margin-top:25px}.article-wrap h3{font-size:18px}.lede{font-size:16px}.visual-row{grid-template-columns:1fr;gap:10px}.visual-row .media{height:175px}.fact-table{font-size:13px}.fact-table td,.fact-table th{padding:9px}.footer-layout{grid-template-columns:1fr;gap:23px;padding:30px 0}.footer-bottom{flex-direction:column;gap:4px}.bottom-nav{position:fixed;z-index:40;bottom:0;left:0;width:100%;height:58px;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid #dcebf3;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{display:flex;align-items:center;justify-content:center;color:#174b78;font-size:13px;font-weight:700}.bottom-nav a[aria-current="page"]{color:#1787db}.back-top{bottom:76px;right:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}
