:root{--bg:#F4F7FA;--surface:#FFF;--mist:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--dark:#163C57;--cyan:#13B8C5;--blue:#237BD3;--heading:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}body.drawer-open{overflow:hidden}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}figure{margin:0}h1,h2,h3,p,ul,ol{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.37}h1{font-size:clamp(2rem,3.3vw,2.75rem);letter-spacing:-.035em}h2{font-size:clamp(1.45rem,2.3vw,1.75rem)}h3{font-size:1.23rem}p{margin-bottom:1.15em}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}.wrap{width:min(100% - 56px,1200px);margin-inline:auto}.reading{max-width:790px}.skip-link{position:fixed;z-index:999;left:12px;top:-80px;padding:10px 18px;background:#fff}.skip-link:focus{top:10px}.brand-strip,.desktop-nav{background:var(--navy);color:#fff}.brand-strip{border-bottom:1px solid #ffffff22}.brand-inner{height:72px;display:flex;align-items:center;gap:21px;min-width:0}.brand-link{display:flex;align-items:center;flex-shrink:0;min-width:0;color:white}.brand-link img{display:block;width:auto;height:auto;max-height:38px;max-width:235px;object-fit:contain}.brand-text{font-size:24px;font-weight:800;line-height:1.1;white-space:nowrap}.brand-text small{font-size:10px;letter-spacing:.16em;display:block;margin-top:5px}.brand-desc{color:#bdd4e0;margin:0;font-size:13px}.brand-desc i{opacity:.5;margin-inline:5px;font-style:normal}.register-link{background:var(--cyan);color:#062d3a;min-height:42px;padding:6px 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#a7bfce;background:#fff}.btn:hover{text-decoration:none;filter:brightness(1.08)}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:9px;border:1px solid var(--line);border-radius:14px;background:var(--mist)}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit,220px);object-fit:contain;object-position:center}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--banner{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin-inline:auto}.media-placeholder{height:180px;width:100%;min-width:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;background:linear-gradient(145deg,#e1edf4,#f4fafb);border:1px dashed #b3cad5;border-radius:10px;color:#64899b;font-weight:700}.media-placeholder small{font-size:12px;font-weight:400}.media-frame--hero 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p{font-size:15px;margin:0}.split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.split.reversed{grid-template-columns:.95fr 1.05fr}.split .media-frame{min-width:0}.split-text h2{margin-bottom:18px}.article-band{background:var(--aqua);padding:32px 0;margin-block:45px}.article-band.navy{background:var(--navy);color:#e4eff4}.article-band.navy h2{color:#fff}.knowledge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.knowledge-tile{padding:25px 23px;background:white;border:1px solid var(--line);border-radius:12px}.knowledge-tile:nth-child(2){margin-top:24px}.knowledge-tile:nth-child(3){margin-top:48px}.knowledge-tile p{font-size:15px}.reading-path{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;counter-reset:step}.path-step{border-top:2px solid var(--cyan);padding:22px 18px 0 0;position:relative}.path-step:not(:last-child):after{content:"";position:absolute;top:-7px;right:12px;border:5px solid 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b{position:absolute;right:18px;top:18px;color:var(--cyan)}.related-item:hover{text-decoration:none;border-color:var(--cyan)}.mobile-bottom{display:none}.site-footer{background:var(--footer);color:#dcecf5;padding:50px 0 20px}.footer-layout{display:grid;grid-template-columns:2fr 1fr;gap:85px}.footer-brand{font-size:25px;color:#fff}.footer-brand span{font-size:12px;letter-spacing:.12em;margin-left:5px}.footer-note{max-width:710px;color:#bfd3de;font-size:13px}.footer-layout h2{font-size:16px;color:#fff}.footer-layout a{display:inline-block;color:#dcecf5;margin:0 15px 9px 0;font-size:14px}.footer-bottom{border-top:1px solid #ffffff2e;margin-top:28px;padding-top:15px;display:flex;justify-content:space-between;gap:15px;color:#afc4d1;font-size:12px}.footer-bottom a{color:#dcecf5}.back-top{position:fixed;bottom:20px;right:20px;width:44px;height:44px;border:0;border-radius:50%;color:white;background:var(--dark);box-shadow:0 3px 12px 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@media(max-width:640px){body{font-size:15px;line-height:1.78}.wrap{width:calc(100% - 32px)}h1{font-size:clamp(25px,7.1vw,32px)}h2{font-size:clamp(20px,5.2vw,23px)}h3{font-size:18px}.lead{font-size:16px}.section-space{margin-block:36px}.home-hero{padding:32px 0 8px;gap:22px}.topic-grid,.knowledge-grid,.related-grid{grid-template-columns:1fr}.topic-row{padding:19px 0}.feature-story{padding:25px}.short-story{padding:18px}.split{gap:20px}.article-band{margin-block:30px;padding:25px 0}.knowledge-tile{padding:19px}.reading-path{grid-template-columns:1fr;gap:14px}.path-step{padding:13px 0 0}.path-step:not(:last-child):after{display:none}.page-intro{padding-top:22px}.page-section{margin-block:34px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--banner{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-placeholder{height:145px}.media-frame--hero .media-placeholder{height:165px}.media-frame--mobile .media-placeholder{height:200px}.footer-layout{gap:18px}.footer-brand{font-size:20px}.footer-bottom{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
@media(max-width:920px){html:not(.js) .no-js-nav{display:flex;flex-wrap:wrap;gap:8px;padding-block:9px}.no-js-nav a{color:var(--heading);background:#fff;border:1px solid var(--line);padding:5px 10px;font-size:12px;border-radius:5px}}