:root{--page:#F6F5F1;--paper:#FFFFFF;--soft:#EDF2F3;--dark:#203646;--heading:#20303B;--body:#3B4A54;--muted:#64737D;--brand:#137C87;--deep-brand:#115460;--accent:#C97751;--line:#DCE3E4;--light:#F7FAFA}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:116px}body{margin:0;background:var(--page);color:var(--body);font:16px/1.78 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}body.modal-open{overflow:hidden}a{color:var(--deep-brand);text-decoration:none}a:hover{text-decoration:underline}button,input{font:inherit}button{cursor:pointer}img{max-width:100%;width:100%;height:auto;display:block;object-fit:contain;object-position:center}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.35}h1{font-size:clamp(26px,3.1vw,38px);letter-spacing:-.025em}h2{font-size:clamp(22px,2.2vw,26px)}h3{font-size:18px}.shell{max-width:1224px;padding-left:32px;padding-right:32px;margin-left:auto;margin-right:auto}.skip-link{position:absolute;z-index:1000;top:-100px;left:16px;padding:10px;background:white}.skip-link:focus{top:10px}
.site-header{position:relative;z-index:20;background:var(--paper);border-bottom:1px solid var(--line)}.brand-bar{height:91px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand-link{display:flex;align-items:center;min-width:0;gap:11px;color:var(--heading)}.brand-link:hover{text-decoration:none}.logo-wrap{width:97px;max-height:55px;display:flex;align-items:center;flex:none}.brand-image{max-width:97px;max-height:55px}.brand-copy{display:flex;flex-direction:column;white-space:nowrap;line-height:1.3;min-width:0}.brand-copy strong{font-size:20px;font-weight:750}.brand-copy small{font-size:10px;letter-spacing:.11em;color:var(--muted);margin-top:5px}.brand-actions{display:flex;align-items:center;gap:20px}.quiet-button{border:0;background:none;color:var(--body);padding:10px;font-size:14px}.quiet-button span{font-size:24px;vertical-align:middle}.brand-app{font-size:14px;font-weight:650}.desktop-nav{border-top:1px solid var(--line)}.nav-inner{display:flex;gap:35px;align-items:center;min-height:55px}.nav-link,.nav-overview{position:relative;font-size:15px;white-space:nowrap;color:var(--heading);padding:15px 0;border:0;background:none}.nav-link.is-active{font-weight:800}.nav-link.is-active:after{content:"";position:absolute;bottom:6px;height:2px;background:var(--brand);left:0;right:0}.nav-overview{margin-left:auto}.mobile-menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;width:44px;height:44px;color:var(--heading);font-size:20px}.main-content{padding-top:39px;padding-bottom:72px;min-height:55vh}.eyebrow{text-transform:uppercase;font-size:13px;font-weight:700;letter-spacing:.13em;color:var(--brand);margin-bottom:14px}
.hero{display:grid;grid-template-columns:minmax(0,54fr) minmax(0,46fr);align-items:center;gap:34px;padding:20px 0 34px}.hero h1{margin-bottom:20px}.hero p:not(.eyebrow){max-width:570px;font-size:16px;line-height:1.88}.hero-visual{min-width:0}.hero-image{height:auto;width:100%;border-radius:14px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 20px;border-radius:9px;font-size:14px;font-weight:700}.button-primary{background:var(--brand);color:white}.button-secondary{background:var(--paper);color:var(--deep-brand);border:1px solid var(--line)}.button-light{background:white;color:var(--dark)}.topic-strip{display:flex;gap:9px;overflow-x:auto;max-width:100%;scrollbar-width:thin;padding:9px 0 13px;margin-bottom:24px}.topic-strip a{white-space:nowrap;flex:none;padding:6px 13px;border-radius:40px;border:1px solid var(--line);background:#fff;color:var(--body);font-size:13px}.home-section{margin-top:52px;margin-bottom:56px}.section-head{margin-bottom:23px}.section-head h2{margin-bottom:9px}.section-head p{color:var(--muted);margin-bottom:0}.spotlight{display:grid;grid-template-columns:1.13fr .87fr;background:var(--paper);border:1px solid var(--line);border-radius:13px;overflow:hidden}.spotlight-feature{padding:34px 38px;background:var(--soft)}.tiny-tag{font-size:13px;color:var(--brand);font-weight:700}.spotlight-feature h3{font-size:24px;max-width:540px;margin:11px 0}.spotlight-feature p{margin-bottom:17px}.spotlight-list{padding:13px 30px}.spotlight-list a{display:flex;align-items:flex-start;flex-direction:column;gap:3px;padding:14px 0;border-bottom:1px solid var(--line)}.spotlight-list a:last-child{border:0}.spotlight-list strong{color:var(--heading)}.spotlight-list span{color:var(--muted);font-size:14px}.inline-link{font-size:14px;font-weight:700;border-bottom:1px solid var(--brand);padding-bottom:2px}.stage-track{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));position:relative;gap:22px;margin:25px 0}.stage-track:before{content:"";position:absolute;top:20px;left:5%;right:5%;height:2px;background:var(--line)}.stage{position:relative;min-width:0}.stage span{display:flex;width:42px;height:42px;align-items:center;justify-content:center;background:var(--brand);color:white;border-radius:50%;font-size:13px;font-weight:800;position:relative;z-index:1;margin-bottom:20px}.stage h3{margin-bottom:6px}.stage p{font-size:14px;color:var(--muted)}.research-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:48px}.research-lead{border-top:3px solid var(--brand);padding-top:25px}.research-lead h3{font-size:26px}.research-lead p:not(.eyebrow){max-width:610px}.research-side{border-left:1px solid var(--line);padding-left:30px}.research-side article{padding-bottom:18px;margin-bottom:20px;border-bottom:1px solid var(--line)}.research-side p{font-size:14px}.duo-section{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.duo-panel{padding:29px 30px;border-radius:13px;border:1px solid var(--line);background:var(--paper)}.duo-panel:first-child{background:#E8F0F1}.duo-panel h2{max-width:390px}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.tool-grid a{padding:24px 25px;background:white;border:1px solid var(--line);border-radius:12px;min-width:0}.tool-grid a:hover{text-decoration:none;border-color:var(--brand)}.tool-grid span{color:var(--brand);font-size:28px}.tool-grid h3{margin:12px 0 7px}.tool-grid p{font-size:14px;color:var(--muted)}.tool-grid b{font-size:14px}.weekly-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px;margin-bottom:18px}.weekly-grid>div{padding-top:16px;border-top:2px solid var(--line)}.weekly-grid span{color:var(--brand);font-size:13px;font-weight:700}.weekly-grid h3{margin:12px 0}.weekly-grid p{font-size:14px}.mobile-feature{background:var(--dark);border-radius:14px;color:var(--light);padding:38px 48px;display:grid;grid-template-columns:1.2fr .8fr;align-items:center;gap:24px}.mobile-feature h2{color:var(--light);max-width:550px}.mobile-feature p{max-width:550px}.mobile-feature .eyebrow{color:#9CE0DC}.mobile-art{max-width:350px;justify-self:center}.app-banner-image{border-radius:12px}.ending-links{margin-bottom:0}.ending-links p{max-width:870px}
.page-heading{max-width:960px;padding:15px 0 10px}.page-heading h1{margin-bottom:17px}.page-lead{font-size:16px;line-height:1.87}.page-image{margin:0 0 38px;display:flex;flex-direction:column;align-items:flex-start}.page-image img{width:auto;max-width:min(100%,520px);max-height:none;border-radius:13px}.page-image figcaption{font-size:13px;color:var(--muted);margin-top:8px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:72px}.article-body{min-width:0}.content-section{border-top:1px solid var(--line);padding:23px 0 29px;scroll-margin-top:100px}.content-section h2{margin-bottom:17px}.content-section p{line-height:1.89}.editor-note{background:var(--soft);border-left:3px solid var(--brand);padding:13px 17px;font-size:14px}.article-sidebar{position:sticky;top:20px;align-self:start;border:1px solid var(--line);background:#fff;border-radius:12px;padding:21px}.article-sidebar h2{font-size:17px}.article-sidebar ol{padding-left:21px;font-size:14px}.article-sidebar li{margin:11px 0}.article-sidebar p{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:12px}.related-block{margin-top:38px;padding:29px 0;border-top:2px solid var(--line)}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px}.related-links>div{padding:18px;background:white;border-radius:10px}.related-links a{font-weight:700}.related-links p{margin:7px 0 0;color:var(--muted);font-size:13px}.table-scroll{overflow-x:auto;max-width:100%}table{border-collapse:collapse;min-width:600px;width:100%;font-size:14px;background:white}th,td{text-align:left;border:1px solid var(--line);padding:12px 15px}th{background:var(--soft);color:var(--heading)}.faq-list{max-width:980px}.faq-entry{border-top:1px solid var(--line);padding:23px 0}.faq-entry h2{font-size:20px;display:flex;gap:15px;align-items:baseline}.faq-entry h2 span{font-size:13px;color:var(--brand)}.faq-entry p{padding-left:38px}
.site-footer{background:var(--paper);border-top:1px solid var(--line);padding:44px 0 32px}.footer-intro{max-width:520px}.footer-logo{display:flex;align-items:center;gap:10px;font-size:17px}.footer-logo img{width:80px;max-height:42px}.footer-intro p{font-size:14px;color:var(--muted);margin:11px 0 26px}.footer-groups{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.footer-group h2{font-size:15px}.footer-group a{display:block;font-size:13px;color:var(--body);margin:7px 0}.footer-service{font-size:13px;margin-top:27px;padding:20px 0;border-top:1px solid var(--line)}.footer-service a{margin:0 8px}.copyright-notice{color:var(--muted);font-size:13px;max-width:1000px}
.ui-backdrop{position:fixed;inset:0;background:rgba(20,34,44,.48);z-index:50}.overview-panel,.search-panel,.mobile-drawer{position:fixed;z-index:60;background:white;box-shadow:0 15px 45px #162f3c22;overflow:auto}.overview-panel[hidden],.search-panel[hidden],.mobile-drawer[hidden],.ui-backdrop[hidden]{display:none!important}.overview-panel{top:146px;left:0;right:0;max-height:calc(100vh - 146px);border-top:1px solid var(--line)}.overview-panel>.shell{padding-top:22px;padding-bottom:28px}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:15px}.panel-heading h2{font-size:21px;margin:0}.close-button{min-height:44px;min-width:44px;border:1px solid var(--line);background:white;border-radius:9px;font-size:19px}.overview-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}.overview-grid h3,.drawer-groups h3{font-size:15px;color:var(--heading)}.overview-grid a{display:block;padding:7px 0;font-size:14px}.overview-service{border-top:1px solid var(--line);margin-top:20px;padding-top:14px;display:flex;gap:20px;flex-wrap:wrap;font-size:13px}.search-panel{top:9vh;left:50%;transform:translateX(-50%);width:min(540px,calc(100vw - 32px));border-radius:15px;padding:26px;max-height:80vh}.search-panel label{font-size:14px}.search-panel input{width:100%;border:1px solid #A4B6B8;padding:11px 13px;border-radius:8px;margin-top:6px;outline-offset:2px}.search-tip{color:var(--muted);font-size:13px}.search-results{display:grid;gap:4px}.search-results>a{padding:10px;border-radius:8px;border:1px solid var(--line);display:grid;gap:3px}.search-results a strong{font-size:14px}.search-results a span{font-size:13px;color:var(--muted)}.mobile-drawer,.mobile-bottom{display:none}.image-fallback{border:1px solid var(--line);border-radius:12px;padding:25px;background:var(--soft);color:var(--muted);font-size:14px;width:100%}
@media(max-width:1050px){.shell{padding-left:24px;padding-right:24px}.nav-inner{gap:20px}.article-layout{gap:30px}.brand-bar{height:81px}.overview-panel{top:136px}.hero{gap:20px}}
@media(max-width:800px){.desktop-nav{display:none}.brand-bar{height:70px}.desktop-search,.brand-app{display:none}.mobile-menu-btn{display:block}.logo-wrap{width:66px;max-height:44px}.brand-image{max-width:66px;max-height:44px}.brand-copy strong{font-size:17px}.brand-copy small{font-size:8px}.main-content{padding-top:21px;padding-bottom:calc(85px + env(safe-area-inset-bottom))}.mobile-bottom{display:flex;position:fixed;z-index:30;bottom:0;left:0;right:0;height:calc(54px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:white;border-top:1px solid var(--line);align-items:center;justify-content:space-around}.mobile-bottom>a,.mobile-bottom>button{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:0;min-width:80px;min-height:44px;background:none;border:0;color:var(--body);font-size:12px}.mobile-bottom span{font-size:20px;line-height:1.2}.mobile-bottom [aria-current=page]{font-weight:800;color:var(--deep-brand)}.mobile-drawer{display:block;left:0;right:0;bottom:0;max-height:82vh;border-radius:18px 18px 0 0;padding:20px 20px calc(22px + env(safe-area-inset-bottom))}.drawer-groups{display:grid;grid-template-columns:1fr 1fr;gap:12px 25px}.drawer-groups a{display:block;padding:6px 0;font-size:14px}.drawer-search{border:1px solid var(--brand);color:var(--deep-brand);background:white;padding:9px 15px;border-radius:9px;margin-top:16px;width:100%;min-height:44px}.article-layout{grid-template-columns:minmax(0,1fr)}.article-sidebar{position:static;order:-1}.article-sidebar ol{columns:2}.footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{grid-template-columns:1fr}.hero-visual{max-width:600px}.stage-track{grid-template-columns:repeat(2,minmax(0,1fr))}.stage-track:before{display:none}.research-grid{gap:24px}.mobile-feature{padding:30px}}
@media(max-width:550px){.shell{padding-left:17px;padding-right:17px}.hero{padding:7px 0 0}.hero h1{font-size:29px}.hero-actions .button{flex:1;min-width:140px;padding:10px}.home-section{margin:34px 0 37px}.spotlight,.research-grid,.duo-section,.tool-grid,.weekly-grid,.mobile-feature,.related-links{grid-template-columns:minmax(0,1fr)}.spotlight-feature{padding:23px}.spotlight-feature h3{font-size:21px}.spotlight-list{padding:10px 22px}.stage-track{gap:8px 15px}.stage h3{font-size:17px}.research-side{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:22px}.tool-grid{gap:10px}.tool-grid a{padding:19px}.mobile-feature{padding:25px 20px}.mobile-art{max-width:270px}.page-image img{max-width:100%}.article-sidebar ol{columns:1}.footer-service a{display:inline-block;margin:4px 7px}.faq-entry h2{font-size:18px}.faq-entry p{padding-left:0}.brand-link{gap:6px}.brand-copy strong{font-size:16px}.brand-copy small{font-size:7px}.logo-wrap,.brand-image{max-width:55px}.drawer-groups{grid-template-columns:1fr 1fr;gap:10px}.page-lead{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}