:root{--bg:#f6fafc;--white:#fff;--light:#eaf6fa;--soft:#edf4f8;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--ocean:#174b78;--heading:#183a56;--ink:#31485d;--muted:#687d8e;--border:#dce9f0;--footer:#123653}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:36px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:var(--ocean);text-underline-offset:4px}a:hover{color:#0879bc}button{font:inherit}button,a,summary{outline-offset:4px}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--cyan)}img{max-width:100%}h1,h2,h3{color:var(--heading);line-height:1.38;letter-spacing:-.02em}h1{font-size:35px;margin:0 0 18px}h2{font-size:26px;margin:0 0 18px}h3{font-size:20px;margin:0 0 10px}p{margin:0 0 16px}section{scroll-margin-top:28px}.container{width:min(1180px,calc(100% - 56px));margin-inline:auto}.site-header{background:#fff;border-bottom:1px solid var(--border)}.toolbar{height:72px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;text-decoration:none;color:var(--ocean);white-space:nowrap;font-size:24px}.brand img{max-height:38px;width:auto;height:auto;object-fit:contain}.brand small,.site-footer small{display:block;font-size:10px;letter-spacing:.14em;line-height:1.3}.strapline{margin:0 auto;color:var(--muted);font-size:14px}.entry-btn,.primary-link{background:var(--ocean);color:#fff;text-decoration:none;border-radius:8px;padding:9px 23px;font-size:14px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;min-height:42px}.entry-btn:hover,.primary-link:hover{color:#fff;background:#0b729c}.desktop-nav{background:var(--ocean)}.nav-row{display:flex;align-items:stretch;justify-content:space-between;gap:8px;min-height:48px}.desktop-nav a{position:relative;display:flex;align-items:center;padding:8px 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img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media--hero{height:clamp(250px,26vw,330px)}.media--feature{height:250px}.media--card{height:170px}.media--banner{height:220px}.media--mobile{height:350px;max-width:320px}.media--foot{height:230px}.media--logo{border:0;background:transparent}.editor-grid{display:grid;grid-template-columns:2fr 1fr;gap:22px}.feature-story,.paper-card,.panel{background:#fff;border:1px solid var(--border);border-radius:15px;padding:26px}.feature-story{background:var(--light)}.story-stack{display:grid;gap:18px}.story-stack article{background:#fff;padding:22px;border:1px solid var(--border);border-radius:12px}.story-stack p:last-child,.feature-story p:last-child,.paper-card p:last-child{margin-bottom:0}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.topic-item{padding:18px 19px;background:#fff;border:1px solid var(--border);border-radius:12px;min-width:0}.topic-item a{display:block;font-size:18px;font-weight:700;text-decoration:none;margin-bottom:9px}.topic-item p{font-size:14px;line-height:1.7;margin:0}.split{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:35px}.split.reverse>.media{order:-1}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mini-grid>*{min-width:0}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;counter-reset:steps;list-style:none;margin:0;padding:0}.steps li{border-top:3px solid var(--cyan);padding:16px 12px 0 0}.steps li::before{counter-increment:steps;content:"0" counter(steps);display:block;color:#078eaa;font-weight:800;font-size:14px}.steps li strong{display:block;color:var(--heading)}.intro{padding-block:42px 24px;max-width:890px}.intro p{font-size:17px}.article-body{max-width:780px}.article-body p,.article-body li{line-height:1.85}.article-body 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@media(max-width:980px){.container{width:min(100% - 44px,1180px)}.toolbar{height:63px;justify-content:space-between;gap:10px}.menu-toggle{display:flex;width:40px;height:40px;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid var(--border);border-radius:8px;background:white;flex-shrink:0}.menu-toggle span{width:19px;height:2px;background:var(--ocean)}.brand{position:absolute;left:50%;transform:translateX(-50%);font-size:20px}.brand img{max-height:30px}.brand small{font-size:8px}.strapline,.desktop-nav{display:none}.entry-btn{padding:7px 12px;min-height:39px;font-size:12px;margin-left:auto}.drawer-backdrop{display:block;position:fixed;inset:0;background:rgba(12,36,51,.48);visibility:hidden;pointer-events:none;opacity:0;z-index:99;transition:opacity .2s,visibility .2s}.mobile-drawer{display:block;position:fixed;top:0;bottom:0;left:0;width:min(86vw,344px);background:#fff;z-index:100;overflow-y:auto;transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .2s,visibility .2s;padding:20px}.drawer-open{overflow:hidden}.drawer-open .drawer-backdrop{visibility:visible;pointer-events:auto;opacity:1}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-heading{display:flex;align-items:center;justify-content:space-between;color:var(--heading);font-size:20px;margin-bottom:15px}.drawer-close{width:40px;height:40px;background:var(--light);border:0;border-radius:8px;font-size:28px}.mobile-drawer a{display:block;padding:9px 10px;border-bottom:1px solid var(--border);text-decoration:none}.drawer-group{font-size:12px;font-weight:800;color:#078eaa;margin:19px 0 3px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.article-layout{grid-template-columns:minmax(0,1fr);gap:22px}.article-aside{position:static}.bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:80;min-height:58px;padding-bottom:env(safe-area-inset-bottom);background:#fff;box-shadow:0 -2px 18px rgba(23,75,120,.1);border-top:1px solid var(--border)}.bottom-nav a{width:25%;display:flex;align-items:center;justify-content:center;text-decoration:none;font-size:13px;font-weight:700}.site-footer{margin-bottom:calc(58px + env(safe-area-inset-bottom))}.back-top{bottom:calc(76px + env(safe-area-inset-bottom))}}
@media(max-width:760px){.hero{grid-template-columns:1fr;gap:24px}.hero .media{order:1}.hero>div:first-child{order:0}.split,.editor-grid,.gallery,.service-grid{grid-template-columns:1fr}.split.reverse>.media{order:0}.mini-grid,.matrix{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr}.section{padding-block:35px}.hero{padding-block:32px}.intro{padding-block:31px 16px}}
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@media(max-height:490px) and (max-width:980px){.bottom-nav{position:static}.site-footer{margin-bottom:0}.back-top{bottom:20px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
.css-demo{width:150px;height:110px;padding:24px;background:#d4f0f8;border:1px solid #b8dae6;border-radius:11px;display:flex;flex-direction:column;gap:10px;justify-content:center}.demo-dot{width:24px;height:24px;border-radius:50%;background:#1787db}.demo-line{width:100%;height:9px;border-radius:6px;background:#8abdcf}.demo-line.short{width:58%}