:root{--bg:#f5fbff;--white:#fff;--soft:#eaf7fc;--ice:#dff5fb;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--ink:#173b60;--body:#2d4359;--muted:#687f93;--line:#dcebf3;--footer:#123653;--radius:20px;--shadow:0 18px 45px rgba(19,79,118,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--body);line-height:1.8;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button{font:inherit;cursor:pointer}img{max-width:100%}.container{width:min(100% - 48px,1160px);margin-inline:auto}h1,h2,h3,h4{color:var(--ink);line-height:1.35;letter-spacing:-.02em}h1{font-size:clamp(30px,3.6vw,40px);margin:0 0 21px}h2{font-size:clamp(22px,2.4vw,26px);margin:0 0 18px}h3{font-size:19px;margin:0 0 12px}p{margin:0 0 17px}small{font-size:13px}.muted,.eyebrow{color:var(--muted)}.eyebrow{font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;margin-bottom:13px;color:#1687aa}.section{padding:46px 0}.section-title{max-width:730px;margin-bottom:26px}.section-title>p{margin-bottom:0}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}.header-inner{height:72px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;flex-shrink:0;min-width:132px}.brand-image{width:auto;height:37px;max-width:165px;object-fit:contain}.brand-wordmark{color:var(--ink);font-size:22px;letter-spacing:.035em;font-weight:900;line-height:1.1;white-space:nowrap}.brand-wordmark span{color:var(--blue)}.brand-wordmark 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rgba(23,135,219,.25)}.header-action{font-size:13px;margin-left:4px}.menu-toggle{display:none}.drawer-overlay{position:fixed;inset:0;background:rgba(14,45,69,.45);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .23s,visibility .23s;z-index:39}.drawer-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{position:fixed;left:0;top:0;bottom:0;width:min(86vw,340px);background:#fff;transform:translateX(-105%);transition:transform .25s;z-index:40;overflow:auto;padding:20px;box-shadow:12px 0 35px rgba(0,34,69,.1);visibility:hidden}.mobile-drawer.is-open{transform:translateX(0);visibility:visible}.drawer-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:18px}.drawer-close{border:0;background:var(--soft);width:36px;height:36px;border-radius:50%;font-size:26px;line-height:1;color:var(--navy)}.mobile-drawer nav{display:flex;flex-direction:column;gap:3px;margin:15px 0}.mobile-drawer nav a{padding:8px 12px;border-radius:9px;font-weight:650;font-size:15px}.mobile-drawer nav a:hover{background:var(--soft)}.drawer-group{font-size:12px;color:var(--muted);font-weight:800;margin:16px 12px 3px}.drawer-action{width:100%}.drawer-open{overflow:hidden}.skip-link{position:absolute;top:-90px;left:20px;z-index:100;padding:8px 15px;background:#fff}.skip-link:focus{top:10px}.hero{padding:49px 0 36px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:35px;align-items:center}.hero-copy{padding:20px 0}.hero-copy>p{max-width:550px;font-size:17px}.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:29px}.text-link{font-size:14px;font-weight:800;color:var(--navy)}.text-link:after{content:' ↗';color:var(--cyan)}.pill{display:inline-flex;color:var(--blue);background:var(--ice);padding:5px 13px;border-radius:30px;font-size:12px;font-weight:800}.media{display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--soft);border-radius:16px;min-height:185px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{position:relative;background:linear-gradient(145deg,#e4f7fc,#c6eefa 57%,#e7f6ff);isolation:isolate}.media-placeholder:before{content:'';position:absolute;border:1px solid rgba(23,135,219,.16);width:58%;aspect-ratio:1;border-radius:50%;right:-16%;top:-42%}.media-placeholder:after{content:'';position:absolute;width:38%;aspect-ratio:1;left:-12%;bottom:-55%;border:24px solid rgba(37,200,209,.10);border-radius:50%}.placeholder-decoration{display:block;width:24%;max-width:95px;aspect-ratio:1;border:1.5px solid rgba(23,135,219,.19);border-radius:24px;transform:rotate(27deg)}.hero-media{height:320px;border-radius:24px}.media-card{height:170px}.media-wide{height:245px}.media-tall{height:310px}.panel{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.feature-card{display:flex;flex-direction:column;gap:10px;padding:25px;background:#fff;border:1px solid var(--line);border-radius:18px;min-height:200px;transition:transform .2s,border-color .2s}.feature-card:hover{transform:translateY(-3px);border-color:var(--sky)}.feature-card .card-number{font-size:12px;font-weight:900;color:var(--blue);letter-spacing:.13em}.feature-card h3{margin:0}.feature-card p{font-size:14px;line-height:1.8;color:var(--muted);flex:1;margin:0}.feature-card .card-arrow{color:var(--blue);font-size:20px;line-height:1}.section-soft{background:#ebf7fc;border-block:1px solid 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a{color:#dceef6;font-size:14px}.footer-links a:hover{color:#8fedf0}.footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:35px;padding:15px 0;display:flex;justify-content:space-between;gap:15px;font-size:12px;color:#c4d7e5}.back-to-top{position:fixed;right:22px;bottom:24px;background:#fff;border:1px solid var(--line);border-radius:50%;height:44px;width:44px;color:var(--navy);box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:15}.back-to-top.visible{opacity:1;visibility:visible}.mobile-bottom{display:none}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}
@media(max-width:1060px){.desktop-nav{gap:10px}.desktop-nav a{font-size:12px}.header-inner{gap:14px}.brand{min-width:115px}.brand-image{max-width:140px}}
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@media(max-width:700px){.container{width:calc(100% - 32px)}.header-inner{gap:7px}.brand{min-width:0}.brand-image{height:28px;max-width:115px}.brand-wordmark{font-size:19px}.brand-wordmark small{font-size:7px}.header-action{height:40px;padding:0 13px;font-size:12px}.header-action span{display:none}.hero{padding:25px 0 16px}.hero-grid{grid-template-columns:1fr;gap:18px}.hero-grid .hero-media{grid-row:1}.hero-copy{padding:0}.hero-media{height:200px}.hero-copy>p,.page-hero .intro{font-size:15px}.section{padding:28px 0}.section-title{margin-bottom:20px}.feature-grid,.topic-grid,.editor-grid,.split,.number-flow,.footer-grid,.reading-list{grid-template-columns:1fr}.feature-card{min-height:0;padding:21px}.split{gap:20px}.split .media{order:-1}.panel{padding:21px}.page-hero{padding:25px 0 18px}.breadcrumbs{margin-bottom:20px}.article-body h2{margin-top:30px}.article-body h3{margin-top:18px}.media-wide{height:185px}.media-card{height:150px}.media-tall{height:240px}.footer-grid{gap:23px}.footer-bottom{flex-direction:column;gap:4px}.site-footer{padding-bottom:58px}.mobile-bottom{position:fixed;z-index:25;bottom:0;left:0;right:0;display:grid;grid-template-columns:repeat(4,1fr);background:white;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);height:56px}.mobile-bottom a{display:grid;place-items:center;color:var(--navy);font-size:13px;font-weight:800}.mobile-bottom a[aria-current=page]{color:var(--blue);background:var(--soft)}.back-to-top{bottom:69px;right:15px}.quote-band{padding:24px}.footer-intro p{margin-top:7px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}