:root{--bg:#F5FBFF;--white:#fff;--tint:#EAF7FC;--soft:#DFF5FB;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--deep:#173B60;--text:#2D4359;--muted:#687F93;--line:#DCEBF3;--footer:#123653;--radius:18px;--shadow:0 14px 44px rgba(23,75,120,.075)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:85px}body{margin:0;background:var(--bg);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);font-size:16px;line-height:1.8}body.drawer-open{overflow:hidden}img{max-width:100%}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:3px}h1,h2,h3{line-height:1.38;color:var(--deep);margin:0 0 16px}h1{font-size:clamp(27px,3.4vw,40px);letter-spacing:-.025em}h2{font-size:clamp(20px,2.4vw,26px)}h3{font-size:19px}p{margin:0 0 17px}ul,ol{padding-left:24px;margin:0 0 20px}li{margin-bottom:8px}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.reading{max-width:820px}.section{padding:42px 0}.section-title{margin-bottom:22px}.eyebrow{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.15em;color:#087C9C;text-transform:uppercase;margin-bottom:10px}.muted{color:var(--muted)}.lead{font-size:18px;color:#48657B;line-height:1.9}.skip-link{position:absolute;left:12px;top:-60px;background:#fff;padding:8px 14px;z-index:100}.skip-link:focus{top:8px}.site-header{position:sticky;top:0;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);z-index:40;backdrop-filter:blur(12px)}.header-inner{height:72px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;flex:none;color:var(--deep);text-decoration:none!important}.brand-image{display:block;width:auto;height:auto;max-height:38px;max-width:175px;object-fit:contain}.brand-fallback{font-size:23px;font-weight:900;letter-spacing:.06em;line-height:1.05;color:var(--blue);white-space:nowrap}.brand-fallback>span{color:var(--cyan)}.brand-fallback 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rgba(23,135,219,.15)}.main-btn:hover{text-decoration:none;filter:brightness(.95)}.header-cta{font-size:13px}.menu-toggle{display:none}.drawer-shade{position:fixed;inset:0;background:rgba(10,29,47,.55);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;z-index:60}.mobile-drawer{position:fixed;inset:0 auto 0 0;width:min(86vw,340px);background:#fff;z-index:61;transform:translateX(-110%);visibility:hidden;transition:transform .25s,visibility .25s;overflow-y:auto;box-shadow:10px 0 40px rgba(10,29,47,.2)}.drawer-open .drawer-shade{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible}.drawer-head{padding:18px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.drawer-close{border:0;background:var(--tint);width:38px;height:38px;border-radius:50%;font-size:28px;color:var(--navy);cursor:pointer}.mobile-drawer nav{padding:10px 20px 30px}.mobile-drawer nav p{margin:20px 0 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15px;vertical-align:top}.compare th{background:#DFF5FB;color:var(--deep)}.steps{counter-reset:steps;list-style:none;padding:0;display:grid;gap:12px}.steps li{counter-increment:steps;background:#fff;padding:15px 20px 15px 58px;border:1px solid var(--line);border-radius:12px;position:relative;margin:0}.steps li::before{content:counter(steps);position:absolute;left:18px;top:16px;width:25px;height:25px;display:grid;place-items:center;border-radius:50%;background:var(--cyan);color:#fff;font-weight:800;font-size:13px}.related-links{padding:35px 0 55px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related-grid a{display:flex;justify-content:space-between;align-items:center;padding:17px 20px;border:1px solid var(--line);background:#fff;border-radius:12px;font-weight:700;color:var(--navy)}.related-grid a:hover{border-color:var(--cyan);text-decoration:none}.insight-list{list-style:none;padding:0}.insight-list li{border-bottom:1px solid var(--line);padding:15px 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@media(max-width:1080px){.desktop-nav{gap:9px}.desktop-nav a{font-size:13px}.header-inner{gap:15px}}
@media(max-width:980px){.header-inner{height:60px;justify-content:space-between}.desktop-nav{display:none}.menu-toggle{display:flex;width:40px;height:40px;flex-direction:column;justify-content:center;align-items:center;gap:5px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer}.menu-toggle span{width:18px;height:2px;background:var(--navy);border-radius:2px}.header-inner>.brand{position:absolute;left:50%;transform:translateX(-50%)}.brand-image{max-height:30px;max-width:140px}.brand-fallback{font-size:19px}.header-cta{margin-left:auto;height:40px;padding:0 13px;font-size:12px}.article-layout{grid-template-columns:minmax(0,1fr)}.side-index{position:static;order:-1;display:flex;gap:8px 16px;flex-wrap:wrap}.side-index strong{width:100%}.side-index a{padding:3px 0}.hero-grid{gap:24px}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}