:root{--bg:#F5FBFF;--white:#fff;--soft:#EAF7FC;--pale:#DFF5FB;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#173B60;--text:#2D4359;--muted:#687F93;--border:#DCEBF3;--footer:#123653;--shadow:0 14px 38px rgba(23,75,120,.075)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:85px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}body.drawer-open{overflow:hidden}a{color:var(--navy);text-underline-offset:3px}a:hover{color:var(--blue)}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}img{max-width:100%}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;left:12px;top:-100px;background:#fff;z-index:150;padding:8px 12px}.skip-link:focus{top:8px}.site-header{position:sticky;top:0;z-index:80;background:#fff;border-bottom:1px solid var(--border);box-shadow:0 2px 12px rgba(21,60,90,.025)}.header-inner{height:72px;display:flex;align-items:center;gap:22px}.brand{display:inline-flex;align-items:center;flex-shrink:0;text-decoration:none;color:var(--heading)}.logo-img{display:block;width:auto;max-width:185px;height:36px;object-fit:contain}.logo-wordmark{font-weight:900;font-size:22px;letter-spacing:.02em;white-space:nowrap}.logo-mark{color:var(--cyan)}.desktop-nav{display:flex;align-items:center;gap:2px;margin-inline:auto;white-space:nowrap}.desktop-nav a{font-size:14px;color:var(--heading);font-weight:600;text-decoration:none;padding:12px 10px;border-radius:8px}.desktop-nav a:hover,.desktop-nav a.active{color:var(--blue);background:var(--soft)}.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 6px 16px rgba(23,135,219,.17)}.main-btn:hover{color:white;filter:brightness(1.06)}.menu-toggle{display:none;width:40px;height:40px;align-items:center;justify-content:center;flex-direction:column;gap:5px;background:transparent;border:1px solid var(--border);border-radius:10px}.menu-toggle span{width:20px;height:2px;background:var(--heading);border-radius:2px}.drawer-overlay{position:fixed;inset:0;z-index:95;background:rgba(10,36,60,.46);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.site-drawer{position:fixed;z-index:96;top:0;bottom:0;left:0;width:min(360px,86vw);background:#fff;transform:translateX(-104%);visibility:hidden;transition:transform .23s,visibility .23s;overflow-y:auto;padding:22px;box-shadow:12px 0 40px rgba(14,47,72,.14)}.drawer-open .drawer-overlay{visibility:visible;pointer-events:auto;opacity:1}.drawer-open .site-drawer{transform:translateX(0);visibility:visible}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:17px;border-bottom:1px solid var(--border)}.drawer-close{border:0;background:var(--soft);color:var(--navy);border-radius:10px;width:40px;height:40px;font-size:28px;line-height:1}.drawer-group{padding:15px 0;border-bottom:1px solid var(--border)}.drawer-group strong{display:block;color:var(--heading);font-size:14px;margin-bottom:7px}.drawer-group a{display:block;text-decoration:none;padding:7px 10px;border-radius:8px;font-size:15px}.drawer-group a:hover{background:var(--soft)}
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img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.hero-media{height:320px}.article-media{height:265px}.card-media{height:185px}.mobile-media{height:260px}.wide-media{height:230px}.media-placeholder{display:flex;align-items:center;justify-content:center;width:100%;height:100%;background:linear-gradient(135deg,#e6f8fb,#dceefa 70%,#ecf9fc)}.placeholder-shape{width:40%;aspect-ratio:1.2;border:2px solid #b7deeb;border-radius:48% 52% 42% 58%;box-shadow:0 0 0 32px rgba(255,255,255,.16),0 0 0 60px rgba(255,255,255,.13)}.section{padding:32px 0 18px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:22px}.section h2,.related h2{font-size:26px;line-height:1.4;color:var(--heading);margin:0 0 14px}.section-head h2{margin:0}.section-head p{margin:4px 0 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var(--border);border-radius:13px;text-decoration:none;display:block;transition:transform .2s,border-color .2s}.topic-item:hover{transform:translateY(-3px);border-color:var(--sky)}.topic-item strong{display:block;color:var(--heading);font-size:19px;margin-bottom:5px}.topic-item span{display:block;color:var(--muted);font-size:14px;line-height:1.65}.split-section{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:32px}.reading-list{margin:0;padding:0;list-style:none;border-top:1px solid var(--border)}.reading-list li{display:flex;justify-content:space-between;gap:18px;align-items:baseline;padding:16px 0;border-bottom:1px solid var(--border)}.reading-list a{font-weight:700;text-decoration:none}.reading-list small{color:var(--muted);white-space:nowrap}.notice-band{background:linear-gradient(110deg,#e2f8fc,#edf6ff);border:1px solid #cae8f2;border-radius:15px;padding:25px 30px}.notice-band p{margin:5px 0}.page-header{padding:49px 0 28px}.page-header h1{font-size:34px;color:var(--heading);line-height:1.4;margin:0 0 13px}.page-header p{max-width:790px;margin:0;color:#516c83;font-size:17px}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:15px}.breadcrumbs a{color:var(--muted)}.content-shell{padding-bottom:45px}.article{max-width:800px}.article h2{font-size:25px;color:var(--heading);line-height:1.45;margin:34px 0 13px}.article h3{font-size:19px;line-height:1.5;color:var(--heading);margin:25px 0 9px}.article p{margin:0 0 18px}.article ul,.article ol{padding-left:24px;margin:10px 0 22px}.article li{margin-bottom:8px}.article figure{margin:22px 0}.article figcaption{font-size:13px;color:var(--muted);padding:7px 4px}.article aside{background:var(--soft);border-left:4px solid var(--cyan);padding:17px 20px;border-radius:0 10px 10px 0;margin:24px 0}.article aside p:last-child{margin-bottom:0}.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 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1fr;gap:42px}.footer-brand{display:inline-flex;text-decoration:none;color:#fff}.footer-brand .logo-wordmark{color:#fff}.footer-brand .logo-img{height:36px}.site-footer h2{font-size:16px;margin:3px 0 15px;color:white}.site-footer p{font-size:14px;color:#D2E7F4;margin:12px 0}.site-footer p.small{font-size:13px}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:7px}.site-footer a{color:#EAF7FF;text-decoration:none;font-size:14px}.site-footer a:hover{text-decoration:underline}.footer-bottom{margin-top:28px;border-top:1px solid rgba(255,255,255,.18);padding:17px 0;display:flex;justify-content:space-between;gap:15px;font-size:12px;color:#BDD9E8}.bottom-nav{display:none}.back-top{position:fixed;bottom:25px;right:24px;opacity:0;pointer-events:none;border:1px solid var(--border);background:white;color:var(--navy);border-radius:50%;width:44px;height:44px;box-shadow:var(--shadow);transition:opacity .2s;z-index:20}.back-top.visible{opacity:1;pointer-events:auto}
@media(max-width:1100px){.desktop-nav a{padding-inline:7px;font-size:13px}.header-inner{gap:13px}}
@media(max-width:980px){.header-inner{height:60px;justify-content:space-between;gap:8px}.desktop-nav{display:none}.menu-toggle{display:flex}.header-inner .brand{position:absolute;left:50%;transform:translateX(-50%)}.header-inner .logo-img{height:29px;max-width:145px}.header-inner .logo-wordmark{font-size:19px}.header-entry{margin-left:auto;height:39px;padding:0 14px;font-size:13px}.hero{padding-top:35px}.content-layout{grid-template-columns:minmax(0,1fr)}.side-index{position:static;order:-1}.side-index a{display:inline-block;margin-right:18px;border:0}.footer-layout{gap:28px}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;z-index:55;background:white;border-top:1px solid var(--border);box-shadow:0 -4px 15px rgba(23,75,120,.06)}.bottom-nav a{text-align:center;text-decoration:none;color:var(--navy);padding:10px 2px;font-size:13px;font-weight:700}.bottom-nav a.active{color:var(--blue)}body{padding-bottom:44px}.back-top{bottom:65px}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}