:root{--bg:#f5fbff;--white:#fff;--soft:#eaf7fc;--brand:#25c8d1;--blue:#1787db;--navy:#173b60;--ink:#2d4359;--muted:#687f93;--border:#dcebf3;--footer:#123653;--shadow:0 16px 44px rgba(24,82,116,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--ink);font-size:16px;line-height:1.8}body.menu-open{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button{font:inherit;cursor:pointer}img{max-width:100%}.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;z-index:200;top:-70px;left:20px;background:white;padding:10px}.skip-link:focus{top:10px}.site-header{position:sticky;top:0;background:#fff;z-index:80;border-bottom:1px solid var(--border);box-shadow:0 2px 16px rgba(18,54,83,.04)}.header-inner{min-height:72px;display:flex;align-items:center;gap:24px}.brand{flex:0 0 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@media(max-width:1080px){.desktop-nav{gap:12px}.desktop-nav a{font-size:13px}.header-inner{gap:14px}.brand{min-width:118px}.brand-fallback{font-size:20px}}
@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:flex}.header-inner{justify-content:space-between;min-height:60px;position:relative}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0;max-width:150px}.brand-media.logo{max-height:30px}.brand-media.logo img{max-height:30px}.brand-fallback{font-size:20px}.header-entry{margin-left:auto;height:39px;padding:0 14px;font-size:13px}.hero-layout{gap:25px}.hero h1{font-size:35px}}
@media(max-width:700px){body{font-size:15px}.wrap{width:calc(100% - 32px)}.section{padding:30px 0}.section-tight{padding:20px 0}.hero{padding:32px 0}.hero-layout{display:flex;flex-direction:column-reverse;align-items:stretch;gap:18px}.hero-media{height:205px}.hero h1{font-size:29px;margin:8px 0 12px}.lead{font-size:15.5px}.section-heading h2,.section h2{font-size:22px}.section-heading{align-items:start;flex-direction:column;gap:4px}.cards{grid-template-columns:1fr}.card{padding:20px}.card h3{font-size:17px}.tile-media{height:155px}.article-media{height:190px}.featured-split,.article-columns,.mosaic,.quick-index{grid-template-columns:1fr}.feature-panel{padding:22px}.page-top{padding:28px 0}.page-top h1{font-size:27px}.page-top p{font-size:15px}.article-shell h2{font-size:21px;margin-top:30px}.article-shell h3{font-size:18px}.related-links{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:24px}.footer-grid>div:first-child{grid-column:span 2}.footer-bottom{flex-direction:column;gap:4px;padding-bottom:52px}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;z-index:70;background:#fff;border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{text-align:center;min-height:54px;display:grid;place-items:center;font-weight:800;font-size:13px;color:var(--navy)}.back-top{bottom:78px;right:14px}.mosaic .card:first-child{grid-row:auto}.brand-media.logo{max-width:114px}.brand-media.logo img{max-width:114px}.header-inner{gap:2px}.header-entry{font-size:12px;padding:0 12px;height:36px;min-width:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}