:root{--bg:#f5fbff;--paper:#fff;--pale:#eaf7fc;--mist:#dff5fb;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--ocean:#174b78;--heading:#173b60;--text:#2d4359;--muted:#687f93;--line:#dcebf3;--footer:#123653;--shadow:0 18px 50px rgba(18,72,114,.075)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button{font:inherit}img{display:block;max-width:100%}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;z-index:200;top:-80px;left:16px;padding:10px;background:white}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.header-inner{height:72px;display:flex;gap:23px;align-items:center}.brand{display:flex;align-items:center;flex-shrink:0;min-width:166px}.brand img{max-width:190px;max-height:38px;width:auto;height:auto;object-fit:contain}.brand-mark{height:38px;width:38px;display:grid;place-items:center;font:bold 29px Arial;border-radius:10px;background:linear-gradient(135deg,var(--cyan),var(--blue));color:white}.brand-mark span{font-size:11px}.brand-word{font-size:22px;font-weight:800;color:var(--heading);line-height:1.1;margin-left:9px;letter-spacing:.03em}.brand-word small{display:block;font-size:9px;font-weight:700;color:var(--blue);letter-spacing:.16em;margin-top:4px}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:clamp(10px,1.25vw,20px);margin-left:auto;white-space:nowrap}.desktop-nav a{font-size:14px;color:var(--ocean);font-weight:650;padding:22px 0;position:relative}.desktop-nav a[aria-current=page],.desktop-nav a:hover{color:var(--blue)}.desktop-nav a[aria-current=page]:after{content:"";position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--cyan)}.enter-btn,.primary-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;flex-shrink:0;white-space:nowrap;padding:0 20px;min-height:42px;border-radius:999px;background:linear-gradient(110deg,#25c8d1,#25b6e8,#1787db);color:#fff;font-weight:700;font-size:14px;box-shadow:0 9px 22px #1787db24}.enter-btn:hover,.primary-btn:hover{color:#fff;filter:brightness(.96);transform:translateY(-1px)}.menu-toggle{display:none;background:none;border:0;width:40px;height:40px;padding:9px;cursor:pointer}.menu-toggle span{display:block;height:2px;background:var(--heading);margin:5px 0}.drawer-overlay{position:fixed;inset:0;background:#0b2d47a6;z-index:98;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .25s,visibility .25s}.mobile-drawer{position:fixed;z-index:99;top:0;bottom:0;left:0;width:min(86vw,340px);overflow-y:auto;background:#fff;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .25s,visibility .25s;padding:18px 22px 40px;box-shadow:var(--shadow)}body.drawer-open{overflow:hidden}body.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}body.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;justify-content:space-between;align-items:center;font-size:14px;font-weight:700;border-bottom:1px solid var(--line)}.drawer-close{border:0;background:transparent;color:var(--heading);font-size:34px;cursor:pointer}.drawer-brand{font-weight:800;color:var(--heading);font-size:25px;padding:20px 0}.drawer-brand small{display:block;font-size:10px;letter-spacing:.18em;color:var(--sky)}.drawer-group{display:flex;flex-direction:column;gap:3px;border-top:1px solid var(--line);padding:13px 0}.drawer-group b{font-size:13px;color:var(--blue)}.drawer-group a{font-size:15px;padding:7px 0}.eyebrow{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--blue);font-weight:800}.hero{padding:64px 0 48px;position:relative}.hero:before{content:"";position:absolute;left:0;right:0;top:0;height:75%;background:radial-gradient(ellipse at 85% 10%,#d7f6ff 0%,transparent 48%);pointer-events:none}.hero-grid{position:relative;display:grid;grid-template-columns:1.07fr .93fr;align-items:center;gap:50px}.hero-copy h1{font-size:clamp(29px,3.5vw,40px);line-height:1.38;letter-spacing:-.025em;color:var(--heading);margin:12px 0 22px}.hero-copy p{max-width:570px;font-size:16px;color:var(--muted);margin:0 0 28px}.hero-actions{display:flex;gap:13px;flex-wrap:wrap}.secondary-btn{padding:8px 21px;border-radius:999px;border:1px solid #b9dbe9;color:var(--ocean);font-weight:700;font-size:14px;background:#fff}.hero-aside{background:linear-gradient(145deg,#d8f8fb,#c8e6f9);padding:14px;border-radius:24px;border:1px solid #c5e9f6}.media{display:flex;justify-content:center;align-items:center;width:100%;overflow:hidden;background:var(--pale);border-radius:14px;min-height:190px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.hero-media{height:306px;min-height:0;background:linear-gradient(135deg,#d8f7fa,#e3efff)}.media-fallback{position:relative}.fallback-art{width:65%;height:67%;border:2px solid #a6dce9;border-radius:22px;transform:rotate(-6deg);opacity:.7;background:linear-gradient(135deg,#ffffff50,#76bfe630);position:relative}.fallback-art:after{content:"";position:absolute;width:55%;height:55%;right:-20%;top:-17%;border-radius:50%;border:16px solid #4bbae325}.hero-strip{display:flex;justify-content:space-between;flex-wrap:wrap;gap:15px;border-top:1px solid var(--line);margin-top:38px;padding-top:19px;font-size:13px;color:var(--muted)}.hero-strip strong{color:var(--ocean)}.section{padding:35px 0 43px}.section-top{margin-bottom:22px}.section-top h2{font-size:26px;line-height:1.4;margin:7px 0 0;color:var(--heading)}.section-top p{margin:9px 0 0;max-width:700px;color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic-card{display:flex;flex-direction:column;gap:7px;background:var(--paper);padding:25px;border-radius:17px;border:1px solid var(--line);transition:transform .2s,border-color .2s;min-height:180px}.topic-card:hover,.feature-card:hover{transform:translateY(-3px);border-color:#8bdbe9}.topic-number{font-size:11px;letter-spacing:.12em;color:var(--sky);font-weight:bold}.topic-card h3{font-size:19px;color:var(--heading);margin:3px 0 0}.topic-card p{font-size:14px;color:var(--muted);line-height:1.75;margin:0}.topic-arrow{margin-top:auto;color:var(--blue);font-weight:700}.editorial{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:stretch}.editorial-panel{padding:35px;border-radius:18px;background:linear-gradient(135deg,#14456c,#207db6);color:white;display:flex;flex-direction:column;justify-content:center}.editorial-panel .eyebrow{color:#9eebf4}.editorial-panel h2{font-size:29px;line-height:1.4;margin:12px 0}.editorial-panel p{color:#d8effc}.editorial-panel a{color:white;text-decoration:underline;text-underline-offset:5px}.editorial-note{padding:30px;background:#fff;border:1px solid var(--line);border-radius:18px}.editorial-note h3{font-size:22px;color:var(--heading);margin-top:0}.editorial-note li{margin:10px 0}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.feature-card{background:white;border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .2s}.feature-card .media{height:175px;border-radius:0;min-height:0}.feature-content{padding:20px 23px}.feature-content h3{color:var(--heading);line-height:1.5;font-size:18px;margin:5px 0}.feature-content p{font-size:14px;color:var(--muted);margin:0}.reading-list{background:white;border:1px solid var(--line);border-radius:16px;overflow:hidden}.reading-list a{display:grid;grid-template-columns:70px 1fr auto;gap:20px;align-items:center;padding:17px 22px;border-bottom:1px solid var(--line)}.reading-list a:last-child{border-bottom:0}.reading-list em{font-style:normal;font-size:12px;color:var(--blue)}.reading-list strong{font-size:16px;color:var(--heading)}.reading-list span{font-size:12px;color:var(--muted)}.mobile-feature{display:grid;grid-template-columns:1.1fr .9fr;gap:32px;align-items:center;background:#e4f5fa;border-radius:20px;padding:34px}.mobile-feature h2{color:var(--heading);font-size:26px}.mobile-feature .media{height:260px;min-height:0}.page-hero{background:linear-gradient(135deg,#e3f9fa 0%,#f6fbff 65%,#eaf4fc 100%);border-bottom:1px solid var(--line);padding:55px 0 48px}.page-hero .kicker{display:flex;align-items:center;gap:10px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.12em}.page-hero h1{font-size:clamp(26px,3.2vw,34px);line-height:1.4;max-width:820px;margin:12px 0 14px;color:var(--heading)}.page-hero p{max-width:800px;color:var(--muted);margin:0}.page-body{padding:42px 0 35px}.article{max-width:820px;margin-inline:auto}.article h2{font-size:25px;line-height:1.45;color:var(--heading);margin:42px 0 13px}.article h3{font-size:19px;color:var(--ocean);line-height:1.5;margin:26px 0 12px}.article p{margin:0 0 17px}.article ul,.article ol{padding-left:22px}.article li{margin:9px 0}.article .lead{font-size:18px;color:var(--ocean);border-left:4px solid var(--cyan);padding-left:21px}.article .media{margin:24px 0 10px;min-height:0;height:260px}.article .caption{font-size:13px;color:var(--muted);text-align:center;margin:8px 0 25px}.split-article{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:24px 0}.surface{background:white;border:1px solid var(--line);border-radius:16px;padding:24px}.surface h3{margin-top:0}.quote-panel{border-left:4px solid var(--cyan);background:#eaf7fc;border-radius:0 12px 12px 0;padding:18px 24px;margin:26px 0;color:var(--ocean)}.data-table{width:100%;border-collapse:collapse;margin:25px 0;background:#fff;font-size:14px;display:table}.data-table th,.data-table td{border:1px solid var(--line);padding:13px 16px;text-align:left;vertical-align:top}.data-table th{background:#eaf7fc;color:var(--heading)}.timeline{border-left:2px solid #b8e5ef;margin-left:10px;padding-left:27px}.timeline section{position:relative;margin-bottom:27px}.timeline section:before{content:"";position:absolute;left:-35px;top:10px;width:13px;height:13px;border:3px solid #25b6e8;border-radius:50%;background:white}.timeline h3{margin:0 0 8px}.timeline p{margin-bottom:0}.project-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:22px 0}.project-grid .surface{min-height:190px}.project-grid .surface h3{margin-top:0}.mini-tag{color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.09em}.glossary{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.glossary>div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.glossary dt{font-weight:800;color:var(--heading)}.glossary dd{margin:4px 0 0;color:var(--muted);font-size:14px}.faq details{border:1px solid var(--line);border-radius:12px;padding:15px 20px;margin-bottom:11px;background:#fff}.faq summary{cursor:pointer;font-weight:750;color:var(--heading)}.faq p{margin:12px 0 0;color:var(--muted)}.related{padding:28px 0 65px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.related-item{display:flex;align-items:center;justify-content:space-between;background:white;border:1px solid var(--line);padding:22px;border-radius:12px;color:var(--heading);font-weight:700}.related-item span:last-child{color:var(--blue)}.site-footer{background:var(--footer);color:#eaf7ff}.footer-main{display:grid;grid-template-columns:1fr .9fr;gap:90px;padding:47px 0 35px}.footer-brand{font-weight:800;font-size:25px}.footer-brand span{display:block;font-size:10px;letter-spacing:.2em;color:#95dce9}.footer-main p{max-width:480px;font-size:14px;color:#c9e2ef}.footer-note{opacity:.8}.footer-links{display:grid;grid-template-columns:repeat(2,1fr);align-content:start;gap:10px}.footer-links a{font-size:14px}.footer-links a:hover{color:#88ecf1}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid #ffffff20;padding:18px 0;font-size:12px;color:#c2ddea}.bottom-nav{display:none}@media(max-width:1050px){.desktop-nav{gap:10px}.desktop-nav a{font-size:12px}.header-inner{gap:13px}.brand{min-width:140px}.brand-word{font-size:18px}.enter-btn{padding:0 14px}}@media(max-width:980px){.desktop-nav{display:none}.menu-toggle{display:block;flex-shrink:0}.header-inner{justify-content:space-between;height:60px}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0}.brand img{max-height:30px;max-width:145px}.brand-mark{height:30px;width:30px;font-size:22px}.brand-word{font-size:16px}.brand-word small{font-size:8px}.enter-btn{font-size:12px;min-height:40px;padding:0 13px}.bottom-nav{position:fixed;z-index:77;display:grid;grid-template-columns:repeat(4,1fr);bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);box-shadow:0 -7px 26px #12365310;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{text-align:center;font-size:13px;font-weight:700;color:var(--ocean);padding:10px 0}.site-footer{padding-bottom:46px}.hero-grid{gap:24px}}@media(max-width:720px){body{font-size:15px;line-height:1.8}.container{width:calc(100% - 32px)}.hero{padding:32px 0 20px}.hero-grid{display:flex;flex-direction:column-reverse;gap:24px;align-items:stretch}.hero-copy h1{font-size:29px;margin:8px 0 13px}.hero-copy p{font-size:15px}.hero-media{height:194px}.hero-aside{padding:9px;border-radius:16px}.hero-strip{gap:8px;margin-top:25px}.hero-strip span{width:100%}.section{padding:25px 0}.section-top h2{font-size:22px}.topic-grid,.feature-grid,.related-grid,.project-grid,.glossary{grid-template-columns:1fr}.topic-card{min-height:0;padding:20px}.editorial,.mobile-feature,.split-article{grid-template-columns:1fr}.editorial-panel,.editorial-note{padding:24px}.editorial-panel h2{font-size:24px}.feature-card .media{height:165px}.reading-list a{grid-template-columns:36px 1fr;gap:10px;padding:15px}.reading-list a span{grid-column:2}.mobile-feature{padding:24px}.mobile-feature .media{height:180px}.page-hero{padding:34px 0}.page-hero h1{font-size:27px}.page-body{padding-top:18px}.article h2{font-size:21px;margin-top:33px}.article h3{font-size:18px}.article .lead{font-size:16px}.article .media{height:185px}.data-table{font-size:13px}.data-table th,.data-table td{padding:9px 8px}.footer-main{grid-template-columns:1fr;gap:18px;padding:32px 0}.footer-bottom{gap:15px;flex-wrap:wrap}.related{padding-bottom:42px}}@media(max-width:365px){.brand-word{font-size:14px}.brand-word small{font-size:7px}.enter-btn{padding:0 10px;font-size:11px}.hero-copy h1{font-size:27px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}