:root{--bg:#F5FBFF;--white:#fff;--pale:#EAF7FC;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--deep:#174B78;--ink:#173B60;--text:#2D4359;--muted:#687F93;--line:#DCEBF3;--footer:#123653;--shadow:0 18px 45px rgba(23,75,120,.075)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text)}button,a{ -webkit-tap-highlight-color:transparent}a{color:var(--deep);text-decoration:none}a:hover{color:var(--blue)}button{font:inherit}img{max-width:100%;height:auto}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip{position:absolute;left:-9999px;top:8px;z-index:100;background:#fff;padding:8px}.skip:focus{left:8px}.site-header{background:white;border-bottom:1px solid var(--line);position:relative;z-index:12}.topbar{height:72px;display:flex;align-items:center;gap:26px}.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;color:var(--ink);font-size:22px;font-weight:800;white-space:nowrap;line-height:1.2}.brand img{width:auto;height:38px;max-width:185px;object-fit:contain}.brand-text small{display:block;font-size:9px;letter-spacing:2px;color:var(--blue);font-weight:700}.brand-mark{width:38px;height:38px;border-radius:12px;background:linear-gradient(120deg,var(--cyan),var(--blue));display:grid;place-items:center;color:white;font-style:italic}.desktop-nav{display:flex;gap:18px;align-items:center;margin-left:auto}.desktop-nav a{font-size:14px;color:var(--deep);font-weight:600;white-space:nowrap;padding:9px 0;border-bottom:2px solid transparent}.desktop-nav a[aria-current],.desktop-nav a:hover{color:var(--blue);border-color:var(--cyan)}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-width:82px;height:42px;padding:0 18px;border-radius:999px;background:linear-gradient(110deg,#25C8D1,#25B6E8,#1787DB);color:#fff;font-weight:700;text-decoration:none;white-space:nowrap;font-size:14px}.main-btn:hover{color:white;filter:brightness(1.05)}.menu-trigger{display:none;background:none;border:0;width:44px;height:44px;padding:10px;cursor:pointer}.menu-trigger span{display:block;height:2px;background:var(--ink);margin:5px 0;border-radius:2px}.drawer-overlay{position:fixed;inset:0;background:rgba(10,34,53,.48);z-index:20;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .25s,visibility .25s}.drawer{position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);background:white;z-index:21;transform:translateX(-102%);visibility:hidden;transition:transform .25s,visibility .25s;box-shadow:var(--shadow);overflow-y:auto}.drawer-open{overflow:hidden}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .drawer{transform:translateX(0);visibility:visible}.drawer-top{padding:18px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);color:var(--ink)}.drawer-close{border:0;background:var(--pale);width:36px;height:36px;border-radius:50%;font-size:25px;color:var(--deep);cursor:pointer}.drawer-content{padding:14px 20px 32px;display:grid}.drawer-label{color:var(--blue);font-weight:800;font-size:12px;letter-spacing:1px;margin:20px 0 5px}.drawer-content a{padding:10px 3px;border-bottom:1px solid var(--line);font-size:15px}.bottom-nav{display:none}.eyebrow{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--blue);font-weight:800}.hero{padding:62px 0 45px;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:42px}.hero h1{font-size:clamp(30px,3.2vw,40px);line-height:1.32;color:var(--ink);margin:13px 0 20px;letter-spacing:-.4px}.hero p{font-size:17px;line-height:1.85;max-width:570px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.light-btn{display:inline-flex;align-items:center;border:1px solid var(--line);padding:7px 21px;border-radius:99px;font-weight:700;background:#fff}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:var(--pale);border:1px solid var(--line);border-radius:16px;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{display:flex;align-items:center;justify-content:center;text-align:center;padding:26px;color:var(--deep);background:radial-gradient(circle at 25% 25%,#dff5fb,transparent 55%),linear-gradient(135deg,#eaf7fc,#d9f1fc);min-height:inherit;width:100%;font-weight:700;font-size:15px}.hero-media{height:300px;box-shadow:var(--shadow)}.hero-media img{max-height:300px}.section{padding:35px 0 45px}.section-header{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:22px}.section-header h2,.section h2,.article h2{font-size:25px;line-height:1.4;color:var(--ink);margin:0 0 13px}.section-header p{margin:0;max-width:750px}.section-header a{font-weight:700;white-space:nowrap}.grid{display:grid;gap:20px}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 8px 28px rgba(23,75,120,.035)}.card h3{font-size:19px;color:var(--ink);line-height:1.45;margin:4px 0 10px}.card p{margin:0 0 14px}.card .card-link{font-weight:700;color:var(--blue)}.card .media{height:165px;margin-bottom:18px}.card .media img{max-height:165px}.card-tag{font-size:12px;color:var(--blue);font-weight:800}.index-strip{border-radius:20px;background:linear-gradient(115deg,#e0f9fc,#eaf4ff);padding:28px 32px}.index-strip h2{margin:0 0 12px}.index-strip p{margin:0}.topic-list{display:grid;grid-template-columns:1fr 1fr;gap:12px 28px;padding:0;list-style:none}.topic-list li{border-bottom:1px solid var(--line);padding:12px 0}.topic-list a{display:flex;justify-content:space-between;align-items:center;font-weight:700}.article{padding:50px 0 80px}.article-head{max-width:860px;margin:0 auto 36px}.article h1{font-size:clamp(26px,2.8vw,34px);line-height:1.35;color:var(--ink);margin:12px 0 17px}.lead{font-size:17px;line-height:1.85;color:var(--text);margin:0}.article-section{margin:0 0 36px}.article-copy{max-width:820px;margin-inline:auto}.article-copy p{margin:0 0 18px}.article h3{font-size:19px;line-height:1.5;color:var(--ink);margin:22px 0 10px}.article ul,.article ol{padding-left:24px}.article li{margin:8px 0}.article-visual{height:230px;margin:25px 0 33px}.article-visual img{max-height:230px}.feature-split{display:grid;grid-template-columns:1fr .95fr;gap:30px;align-items:center;margin-bottom:32px}.feature-split .media{height:240px}.feature-split .media img{max-height:240px}.note{background:var(--pale);padding:22px 25px;border-left:3px solid var(--cyan);border-radius:0 14px 14px 0}.note p:last-child{margin-bottom:0}.compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.compare>div{border:1px solid var(--line);padding:23px;border-radius:14px;background:white}.table-scroll{overflow-x:auto;margin:22px 0}.data-table{border-collapse:collapse;background:#fff;width:100%;min-width:550px}.data-table th,.data-table td{border:1px solid var(--line);text-align:left;padding:12px 16px;vertical-align:top}.data-table th{color:var(--ink);background:var(--pale)}.steps{counter-reset:step;display:grid;gap:14px;padding:0;list-style:none}.steps li{position:relative;background:white;border:1px solid var(--line);border-radius:14px;padding:19px 20px 19px 60px;margin:0}.steps li:before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:18px;width:28px;height:28px;border-radius:50%;background:var(--blue);color:white;font-size:14px;font-weight:bold;text-align:center;line-height:28px}.related{margin-top:44px;border-top:1px solid var(--line);padding-top:25px}.related h2{font-size:22px}.related-links{display:flex;flex-wrap:wrap;gap:10px}.related-links a{background:white;border:1px solid var(--line);border-radius:99px;padding:8px 18px;font-size:14px;font-weight:700}.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 20px;margin-bottom:10px}.faq summary{font-weight:700;color:var(--ink);cursor:pointer}.faq p{margin:9px 0 1px}.site-footer{background:var(--footer);color:#eaf7ff;padding:45px 0 18px;font-size:14px}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 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5px}.muted{color:var(--muted)}
@media(max-width:1100px){.desktop-nav{gap:12px}.topbar{gap:14px}.desktop-nav a{font-size:13px}.brand{font-size:19px}}@media(max-width:980px){.desktop-nav{display:none}.menu-trigger{display:block}.topbar{justify-content:space-between;height:60px;position:relative}.brand{position:absolute;left:50%;transform:translateX(-50%)}.brand img{height:30px;max-width:135px}.brand-mark{width:30px;height:30px}.brand-text{font-size:18px}.brand-text small{font-size:7px}.enter{margin-left:auto;height:40px;min-width:78px;padding:0 14px}.bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:11;background:#fff;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{flex:1;display:grid;place-items:center;height:52px;font-size:13px;font-weight:700}.bottom-nav a[aria-current]{color:var(--blue)}body{padding-bottom:calc(52px + env(safe-area-inset-bottom))}}@media(max-width:720px){body{font-size:15px}.wrap{width:calc(100% - 32px)}.hero{grid-template-columns:1fr;gap:22px;padding:26px 0 22px}.hero .hero-media{grid-row:1;height:205px}.hero-media img{max-height:205px}.hero h1{font-size:29px}.hero p,.lead{font-size:16px}.section{padding:24px 0 32px}.section-header{display:block}.section-header h2,.section h2,.article h2{font-size:21px}.section-header>a{display:inline-block;margin-top:8px}.grid-3,.grid-2,.compare,.feature-split,.footer-grid,.topic-list{grid-template-columns:1fr}.feature-split{gap:16px}.article{padding:29px 0 50px}.article h1{font-size:27px}.article h3{font-size:18px}.article-visual{height:180px}.article-visual img{max-height:180px}.index-strip{padding:24px 20px}.card{padding:20px}.card .media{height:145px}.card .media img{max-height:145px}.feature-split .media{height:185px}.feature-split .media img{max-height:185px}.footer-grid{gap:20px}.footer-bottom{flex-wrap:wrap}.site-footer{padding:35px 0 20px}.brand-text{font-size:16px}.brand-text small{letter-spacing:1px}.main-btn{font-size:13px}}
@media(max-width:350px){.brand{font-size:14px}.brand-mark{display:none}.enter{padding:0 10px;min-width:70px}.menu-trigger{padding:9px;width:39px}.brand-text{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}