:root{--bg:#f5fbff;--paper:#fff;--pale:#eaf7fc;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--deep:#174b78;--title:#173b60;--text:#2d4359;--sub:#687f93;--line:#dcebf3;--shadow:0 14px 40px rgba(23,75,120,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.78 Arial,'PingFang SC','Microsoft YaHei',sans-serif}body.drawer-open{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button{font:inherit;cursor:pointer}img{max-width:100%}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link{position:absolute;top:-80px;left:16px;z-index:200;background:#fff;padding:10px 18px}.skip-link:focus{top:8px}a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.header-inner{height:72px;display:flex;align-items:center;gap:26px}.brand{display:inline-flex;align-items:center;flex-shrink:0;min-width:0}.brand-logo{display:block;max-height:38px;width:auto;max-width:180px;object-fit:contain}.brand-fallback{display:flex;align-items:center;gap:9px;color:var(--title);font-weight:800;font-size:20px;line-height:1.2;white-space:nowrap}.brand-fallback small{display:block;color:var(--blue);font-size:9px;letter-spacing:1.5px;margin-top:2px}.brand-mark{display:grid;place-items:center;width:36px;height:36px;color:#fff;border-radius:11px;background:linear-gradient(135deg,var(--cyan),var(--blue))}.desktop-nav{display:flex;justify-content:center;align-items:center;gap:clamp(12px,1.6vw,25px);margin-left:auto}.desktop-nav a{font-weight:600;font-size:14px;color:var(--deep);white-space:nowrap;position:relative;padding:25px 0}.desktop-nav a.active,.desktop-nav a:hover{color:var(--blue)}.desktop-nav a.active:after{content:'';height:3px;background:var(--cyan);bottom:0;left:0;right:0;position:absolute;border-radius:2px}.main-btn{display:inline-flex;justify-content:center;align-items:center;gap:7px;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;font-size:14px;box-shadow:0 8px 20px rgba(37,182,232,.2)}.main-btn:hover{color:#fff;filter:brightness(.94);transform:translateY(-1px)}.header-action{margin-left:4px}.menu-toggle{display:none;border:0;background:transparent;width:42px;height:42px;flex-direction:column;justify-content:center;gap:5px;padding:9px}.menu-toggle span{height:2px;width:23px;background:var(--deep);display:block;border-radius:3px}.drawer-overlay{position:fixed;inset:0;background:rgba(10,30,49,.5);z-index:70;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);overflow:auto;background:#fff;z-index:71;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .25s,visibility .25s;box-shadow:var(--shadow);padding:18px 22px}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:15px;border-bottom:1px solid var(--line)}.drawer-close{border:0;background:var(--pale);font-size:30px;color:var(--title);width:36px;height:36px;line-height:1;border-radius:10px}.drawer-label{font-size:12px;color:var(--blue);font-weight:800;letter-spacing:1px;margin:23px 0 5px}.mobile-drawer nav>a{display:block;border-bottom:1px solid #eef5f8;padding:9px 4px;font-size:15px;font-weight:600}
.hero{padding:58px 0 40px;position:relative}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:44px}.eyebrow,.kicker{font-size:12px;font-weight:800;letter-spacing:2px;color:#148ca8;text-transform:uppercase}.hero h1{font-size:clamp(31px,3.4vw,40px);line-height:1.32;color:var(--title);letter-spacing:-1px;margin:14px 0 20px}.hero p{font-size:17px;line-height:1.86;color:#526b80;max-width:565px}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}.text-link{font-size:14px;display:inline-flex;align-items:center;color:var(--deep);font-weight:700;padding:11px 0}.hero-media{min-height:310px}.media{position:relative;display:flex;justify-content:center;align-items:center;width:100%;margin:0;overflow:hidden;background:linear-gradient(125deg,#dcf5f9,#eef8ff);border:1px solid #d4ecf4;border-radius:18px;min-height:190px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media--empty{background:radial-gradient(circle at 70% 30%,#d2f4f9 0,transparent 35%),linear-gradient(125deg,#e6f8fa,#eef6ff);}.placeholder-symbol{font-size:clamp(55px,10vw,110px);font-weight:100;color:rgba(37,182,232,.20)}.hero-media.media{height:320px}.feature-media.media{height:255px}.card-media.media{height:180px}.phone-media.media{height:300px;max-width:380px}.section{padding:35px 0 46px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:22px;margin-bottom:23px}.section-heading h2{margin:6px 0 0;font-size:27px;color:var(--title);line-height:1.4}.section-heading p{font-size:14px;margin:0;max-width:390px}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.topic-card{display:block;background:#fff;border:1px solid var(--line);padding:26px;border-radius:16px;min-height:215px;box-shadow:0 4px 16px rgba(23,75,120,.025);transition:transform .2s,border-color .2s,box-shadow .2s}.topic-card:hover{transform:translateY(-4px);border-color:#a7d9ea;box-shadow:var(--shadow)}.topic-card h3{margin:10px 0;color:var(--title);font-size:19px}.topic-card p{font-size:14px;margin:0;color:var(--sub);line-height:1.75}.card-more{display:block;color:var(--blue);font-weight:800;font-size:13px;margin-top:14px}.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}.surface{background:#fff;border:1px solid var(--line);border-radius:19px;padding:30px;box-shadow:var(--shadow)}.surface h2,.surface h3{color:var(--title);margin-top:0}.surface p{margin-bottom:0}.article-list{display:grid;gap:12px}.article-list a{display:flex;gap:16px;align-items:start;padding:15px 0;border-bottom:1px solid var(--line)}.article-list a:last-child{border:0}.article-list .index-no{color:var(--cyan);font-size:24px;line-height:1.3;font-weight:800}.article-list strong{color:var(--title);display:block}.article-list small{display:block;color:var(--sub);font-size:13px;margin-top:4px}.tint-panel{background:linear-gradient(120deg,#e8f9fb,#eff6ff);padding:30px;border:1px solid var(--line);border-radius:18px}.tint-panel h2{color:var(--title);margin:0 0 10px;font-size:25px}.small-note{font-size:13px;color:var(--sub)}.inline-links{display:flex;gap:12px 22px;flex-wrap:wrap;margin-top:20px}.inline-links a{color:var(--blue);font-weight:700;font-size:14px}.main-intro{padding:55px 0 25px}.main-intro h1{max-width:800px;color:var(--title);font-size:clamp(27px,3vw,34px);line-height:1.38;margin:8px 0 17px}.main-intro .lead{font-size:17px;max-width:850px;color:#526b80;margin:0;line-height:1.9}.breadcrumb{font-size:13px;color:var(--sub)}.breadcrumb a{color:var(--blue)}.content-area{padding-bottom:70px}.editorial-grid{display:grid;grid-template-columns:minmax(0,1fr) 286px;gap:36px;align-items:start}.article-body{min-width:0}.article-body h2{font-size:25px;line-height:1.4;margin:37px 0 15px;color:var(--title)}.article-body h2:first-child{margin-top:0}.article-body h3{font-size:19px;line-height:1.5;margin:25px 0 9px;color:var(--deep)}.article-body p,.article-body li{font-size:16px;line-height:1.85}.article-body ul,.article-body ol{padding-left:23px}.article-body p{margin:13px 0 18px}.article-body blockquote{border-left:4px solid var(--cyan);margin:25px 0;padding:12px 21px;background:var(--pale);border-radius:0 12px 12px 0;font-weight:600;color:var(--deep)}.aside-card{border:1px solid var(--line);background:#fff;border-radius:14px;padding:22px;margin-bottom:19px}.aside-card h3{margin:0 0 12px;color:var(--title)}.aside-card a{display:block;padding:10px 0;border-bottom:1px solid #edf3f7;font-size:14px}.aside-card a:last-child{border:0}.aside-card p{font-size:14px;color:var(--sub)}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-card{padding:22px;border:1px solid var(--line);border-radius:14px;background:#fff}.compare-card h3{margin:0 0 9px}.compare-card p{font-size:15px;margin:0}.info-table{width:100%;border-collapse:collapse;background:#fff;font-size:14px;margin:21px 0 27px}.info-table th,.info-table td{padding:13px 15px;border:1px solid var(--line);text-align:left;vertical-align:top}.info-table th{background:var(--pale);color:var(--title)}.number-steps{counter-reset:step;list-style:none!important;padding:0!important}.number-steps li{position:relative;margin:12px 0;padding:17px 18px 17px 68px!important;background:#fff;border:1px solid var(--line);border-radius:12px}.number-steps li:before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:17px;top:16px;color:var(--blue);font-weight:800}.quote-banner{border-radius:18px;background:linear-gradient(120deg,#174b78,#168fbe);padding:36px;color:#fff;margin:34px 0}.quote-banner h2,.quote-banner p{color:#fff;margin:0}.quote-banner p{margin-top:12px}.visual-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:stretch}.visual-grid .surface{height:100%}.tag-list{display:flex;gap:9px;flex-wrap:wrap;margin:15px 0}.tag-list span{background:var(--pale);border-radius:999px;padding:5px 12px;font-size:13px;color:var(--deep)}.faq-list details{border-bottom:1px solid var(--line);padding:17px 0}.faq-list summary{cursor:pointer;font-weight:700;color:var(--title);padding-right:24px}.faq-list details p{font-size:15px;margin:10px 0 0}.page-links{margin:38px 0 0;padding:21px 23px;border-radius:16px;background:#eaf7fc}.page-links strong{display:block;color:var(--title);margin-bottom:7px}.page-links a{display:inline-block;margin-right:19px;margin-top:7px;color:var(--blue);font-weight:700;font-size:14px}.site-footer{background:#123653;color:#eaf7ff;padding:52px 0 10px}.footer-layout{display:grid;grid-template-columns:2fr 1fr 1fr;gap:50px}.footer-brand{font-size:23px;color:#fff;font-weight:800}.footer-brand span{font-size:11px;letter-spacing:1px;margin-left:5px}.site-footer p{font-size:14px;color:#c1dbe7}.site-footer .fineprint{font-size:12px;max-width:485px;color:#abc7d7}.site-footer nav strong{display:block;margin-bottom:13px;color:#fff}.site-footer nav a{display:block;font-size:13px;padding:5px 0;color:#d2e6ee}.site-footer a:hover{color:#fff}.footer-bottom{margin-top:36px;padding:15px 0;border-top:1px solid rgba(255,255,255,.13);display:flex;justify-content:space-between;font-size:12px;color:#aecbd9}.bottom-nav{display:none}.back-top{position:fixed;bottom:30px;right:22px;border:0;border-radius:50%;width:43px;height:43px;color:#fff;background:var(--blue);box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;z-index:30}.back-top.is-visible{opacity:1;visibility:visible;pointer-events:auto}
@media(max-width:1100px){.header-inner{gap:17px}.desktop-nav{gap:12px}.desktop-nav a{font-size:13px}.header-action{padding-inline:14px}}
@media(max-width:980px){.header-inner{height:60px;justify-content:space-between;gap:10px}.menu-toggle{display:flex;flex:0 0 42px}.brand-logo{max-height:30px;max-width:145px}.brand-fallback{font-size:17px}.brand-mark{width:31px;height:31px}.desktop-nav{display:none}.header-action{height:39px;padding:0 13px;font-size:12px;min-width:75px;margin:0}.hero{padding:36px 0}.hero-grid{gap:23px}.hero-media.media{height:270px}.bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);height:58px;z-index:40;justify-content:space-around;align-items:center;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{font-size:13px;color:var(--deep);font-weight:700;text-align:center;flex:1}.bottom-nav a[aria-current="page"]{color:var(--blue)}body{padding-bottom:58px}.back-top{bottom:76px}.editorial-grid{grid-template-columns:minmax(0,1fr) 240px;gap:23px}}
@media(max-width:720px){.container{width:calc(100% - 32px)}.hero-grid,.split,.editorial-grid,.visual-grid{grid-template-columns:1fr}.hero-grid .hero-media{order:-1}.hero-media.media{height:215px}.hero h1{font-size:29px;margin:10px 0 14px}.hero p,.main-intro .lead{font-size:15px}.hero{padding:22px 0 25px}.section{padding:25px 0 30px}.section-heading{display:block;margin-bottom:18px}.section-heading h2{font-size:22px}.section-heading p{margin-top:9px}.topic-grid{grid-template-columns:1fr 1fr;gap:12px}.topic-card{padding:18px;min-height:190px}.topic-card h3{font-size:17px}.topic-card p{font-size:13px}.surface,.tint-panel{padding:21px}.feature-media.media{height:190px}.main-intro{padding:33px 0 24px}.main-intro h1{font-size:27px}.article-body h2{font-size:22px}.article-body h3{font-size:18px}.article-body p,.article-body li{font-size:15px}.aside-card{margin-top:6px}.compare-grid{grid-template-columns:1fr}.info-table{font-size:13px}.info-table th,.info-table td{padding:9px}.footer-layout{grid-template-columns:1fr 1fr;gap:23px}.footer-layout>div{grid-column:1/-1}.site-footer{padding-top:33px}.footer-bottom{margin-top:22px}.quote-banner{padding:25px}}
@media(max-width:410px){.topic-grid{grid-template-columns:1fr}.topic-card{min-height:unset}.header-action span{display:none}.brand-fallback small{font-size:8px}.main-btn{font-size:13px}.header-action{padding:0 12px}.footer-layout{gap:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}