:root{--bg:#F5FBFF;--paper:#fff;--soft:#EAF7FC;--soft2:#DFF5FB;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#173B60;--text:#2D4359;--muted:#687F93;--line:#DCEBF3;--footer:#123653;--radius:16px;--shadow:0 16px 45px rgba(23,75,120,.07)}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased}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%}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.38;font-weight:800}h1{font-size:clamp(30px,3.3vw,40px);letter-spacing:-.035em}h2{font-size:clamp(22px,2.2vw,26px)}h3{font-size:19px}p{margin-bottom:16px}ul,ol{padding-left:1.45em}li+li{margin-top:7px}strong{color:var(--heading)}:focus-visible{outline:3px solid var(--sky);outline-offset:3px}.wrap{max-width:1160px;padding:0 24px;margin:0 auto}.skip-link{position:absolute;left:8px;top:-100px;background:white;z-index:1000;padding:8px 15px}.skip-link:focus{top:8px}.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}.header-inner{height:72px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;justify-content:flex-start;flex:0 0 auto;min-width:150px}.brand img{display:block;width:auto;height:38px;max-width:185px;object-fit:contain}.brand-fallback{display:flex;align-items:center;gap:10px;color:var(--heading);line-height:1.1}.brand-fallback strong{display:block;font-size:20px;white-space:nowrap}.brand-fallback small{font-size:9px;letter-spacing:.18em;color:var(--muted)}.brand-mark{width:36px;height:36px;display:grid;place-items:center;color:white;font-size:22px;font-weight:bold;border-radius:11px;background:linear-gradient(135deg,var(--cyan),var(--blue))}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:clamp(10px,1.45vw,23px);flex:1;white-space:nowrap}.desktop-nav a{font-size:14px;font-weight:700;color:var(--navy);padding:21px 0;border-bottom:3px solid transparent}.desktop-nav a:hover,.desktop-nav .active{color:var(--blue);border-color:var(--sky)}.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;box-shadow:0 7px 18px rgba(23,135,219,.16)}.main-btn:hover{color:white;filter:brightness(1.08)}.header-cta{font-size:14px}.menu-toggle{display:none}.drawer,.drawer-overlay{visibility:hidden;pointer-events:none;opacity:0}.section-space{margin:44px 0}.eyebrow{margin:0 0 10px;color:#087F9D;font-size:12px;font-weight:800;letter-spacing:.16em}.section-head{margin-bottom:22px}.section-head p:not(.eyebrow){max-width:740px;color:var(--muted)}.section-head h2{margin-bottom:7px}.hero{padding:62px 0 42px;background:radial-gradient(circle at 84% 22%,#D9F5FE 0,transparent 42%),linear-gradient(155deg,#fff 0%,#F5FBFF 74%)}.hero-grid{display:grid;grid-template-columns:1.04fr .96fr;align-items:center;gap:48px}.hero h1{max-width:620px;margin:0 0 23px}.hero .lead{font-size:17px;line-height:1.85;max-width:570px}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:15px;margin-top:26px}.text-link{font-weight:700;color:var(--navy);text-decoration:underline;text-decoration-color:var(--cyan);text-underline-offset:6px}.hero-meta{font-size:13px;color:var(--muted);margin:24px 0 0}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:var(--soft);border-radius:14px;position:relative}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media--hero{min-height:315px;max-height:380px}.media--landscape{min-height:175px;max-height:290px}.media--banner{min-height:160px;max-height:260px}.media--portrait{min-height:290px;max-height:400px}.media--empty{border:1px solid #CBE6F3;background:radial-gradient(circle at 30% 25%,rgba(37,200,209,.18),transparent 42%),linear-gradient(135deg,#E9F8FC,#D9F0FB)}.media-decoration{width:37%;aspect-ratio:1;border-radius:50%;border:14px solid rgba(37,182,232,.10);box-shadow:0 0 0 28px rgba(37,200,209,.05),0 0 0 55px rgba(23,135,219,.035)}.section-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.topic-card,.panel,.mini-card{border:1px solid var(--line);background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow)}.topic-card{padding:24px;display:block;transition:transform .2s,border-color 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p{font-size:14px;color:var(--muted);margin:0}.pill{display:inline-flex;padding:4px 12px;border-radius:999px;background:#DAF3F8;color:#16769D;font-weight:800;font-size:12px}.page-banner{padding:55px 0 35px;background:linear-gradient(120deg,#fff,#E8F8FC)}.page-banner h1{font-size:clamp(26px,3vw,34px);margin:10px 0 12px}.page-banner .lead{max-width:800px;font-size:17px}.breadcrumb{font-size:13px;color:var(--muted)}.breadcrumb a{color:var(--navy)}.article-container{max-width:820px;margin:0 auto}.article-container h2{margin-top:38px}.article-container h3{margin-top:25px}.article-container p,.article-container li{line-height:1.85}.article-container .media{margin:22px 0}.article-container blockquote{margin:25px 0;padding:22px 26px;background:var(--soft);border-left:4px solid var(--cyan);border-radius:0 10px 10px 0}.article-container blockquote p:last-child{margin:0}.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 265px;gap:40px;align-items:start}.side-index{position:sticky;top:100px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:14px}.side-index h2{font-size:17px}.side-index a{display:block;font-size:14px;padding:9px 0;border-bottom:1px solid var(--line)}.side-index a:last-child{border:0}.compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.compare-panel{padding:25px;border-radius:16px;border:1px solid var(--line);background:#fff}.compare-panel h3{margin:0 0 12px}.table-scroll{overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:12px;background:white}table{border-collapse:collapse;width:100%;min-width:530px;text-align:left;font-size:14px}th,td{padding:14px 17px;border-bottom:1px solid var(--line);vertical-align:top}tr:last-child td{border-bottom:0}th{background:var(--soft);color:var(--heading);font-weight:800}.numbered{counter-reset:section;padding:0;list-style:none}.numbered 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@media(max-width:1100px){.desktop-nav{gap:10px}.desktop-nav a{font-size:13px}.brand{min-width:135px}.header-inner{gap:14px}.header-cta{padding:0 15px}}
@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;width:40px;height:40px;padding:0;background:transparent;border:0;flex:0 0 40px}.menu-toggle span{width:21px;height:2px;border-radius:3px;background:var(--heading)}.header-inner{height:60px;justify-content:space-between;gap:8px}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0}.brand img{height:30px;max-width:145px}.brand-fallback strong{font-size:16px}.brand-fallback small{font-size:8px}.brand-mark{width:29px;height:29px}.header-cta{height:39px;padding:0 14px;font-size:12px;margin-left:auto}.drawer-overlay{position:fixed;inset:0;z-index:70;background:rgba(14,37,55,.54);transition:opacity .22s}.drawer{position:fixed;top:0;bottom:0;left:0;z-index:71;width:min(86vw,340px);background:white;transform:translateX(-102%);transition:transform .23s,opacity .23s;display:flex;flex-direction:column}.drawer-open .drawer,.drawer-open .drawer-overlay{visibility:visible;pointer-events:auto;opacity:1}.drawer-open .drawer{transform:translateX(0)}.drawer-top{display:flex;align-items:center;justify-content:space-between;min-height:66px;padding:14px 20px;border-bottom:1px solid var(--line)}.drawer-title{font-size:18px;font-weight:800;color:var(--heading)}.drawer-close{border:0;background:var(--soft);border-radius:50%;width:34px;height:34px;font-size:24px;line-height:1;color:var(--heading)}.drawer-scroll{padding:12px 24px 28px;overflow:auto}.drawer-group{padding:9px 0 16px;border-bottom:1px solid var(--line)}.drawer-group p{font-size:12px;color:#1684A2;font-weight:800;margin:5px 0}.drawer-group a{display:block;padding:8px 0;color:var(--heading);font-weight:700}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:48;display:grid;grid-template-columns:repeat(4,1fr);min-height:60px;align-items:center;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 28px rgba(23,75,120,.07)}.bottom-nav a{text-align:center;color:var(--navy);font-size:13px;font-weight:700;padding:14px 5px}.bottom-nav a[aria-current]{color:var(--blue)}body{padding-bottom:60px}.back-top{bottom:76px}.footer-main{gap:25px}.content-layout{grid-template-columns:1fr}.side-index{position:static;display:none}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}