:root{--ink:#17211f;--muted:#5d6864;--line:#d8dfdc;--paper:#fff;--soft:#f2f5f3;--brand:#123d35;--accent:#b32634;--max:1180px;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","Noto Sans SC",Arial,sans-serif;line-height:1.75;letter-spacing:0}a{color:inherit}.site-header{min-height:72px;padding:12px max(24px,calc((100% - var(--max))/2));display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);background:#fff}.brand{text-decoration:none;font-weight:800}.brand small{display:block;color:var(--muted);font-size:11px;font-weight:600}.site-header nav{display:flex;gap:20px}.site-header nav a{text-decoration:none;color:var(--muted);font-size:14px}.hub-hero{background:var(--brand);color:#fff;padding:64px max(24px,calc((100% - var(--max))/2)) 56px}.hub-hero h1{max-width:820px;margin:8px 0 12px;font-size:clamp(34px,5vw,58px);line-height:1.12}.hub-hero p{max-width:760px;margin:0;color:#dbe8e4}.eyebrow{margin:0;color:var(--accent);font-size:13px;font-weight:800}.hub-hero .eyebrow{color:#f1b8bd}.hub-shell,.article-shell{width:min(var(--max),calc(100% - 48px));margin:0 auto}.hub-section{padding:48px 0}.hub-section>header{max-width:760px;margin-bottom:24px}.hub-section h2{font-size:28px;margin:0 0 8px}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.topic-link{min-height:168px;border:1px solid var(--line);border-radius:6px;padding:20px;background:#fff;color:var(--ink);text-decoration:none;display:flex;flex-direction:column;justify-content:space-between}.topic-link:hover{border-color:var(--brand);box-shadow:0 8px 24px rgba(18,61,53,.08)}.topic-link strong{font-size:18px}.topic-link span,.topic-link small{color:var(--muted)}.category-group{padding:32px 0;border-top:1px solid var(--line)}.category-group h2{margin-top:0}.article-shell{max-width:900px}.breadcrumb{padding:24px 0 0;display:flex;gap:8px;color:var(--muted);font-size:14px}.article-shell article{padding:36px 0 64px}.article-head{padding-bottom:32px;border-bottom:1px solid var(--line)}.article-head h1{font-size:clamp(32px,5vw,52px);line-height:1.2;margin:8px 0 16px}.lead{font-size:19px;color:#34413d}.updated{font-size:13px;color:var(--muted)}article section{padding:28px 0}article section h2{font-size:25px;margin:0 0 12px}article section p{margin:8px 0}.faq-list{border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line);padding:14px 0}summary{cursor:pointer;font-weight:700}.sources{background:var(--soft);padding:28px!important;margin:16px 0}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-grid a{border:1px solid var(--line);padding:16px;text-decoration:none}.cta-band{background:var(--brand);color:#fff;padding:32px!important;display:flex;justify-content:space-between;gap:24px;align-items:center}.cta-band h2{margin:4px 0}.cta-actions{display:flex;gap:10px;flex-wrap:wrap}.button{display:inline-flex;min-height:44px;padding:9px 16px;border:1px solid #fff;align-items:center;justify-content:center;text-decoration:none;font-weight:700}.button.primary{background:#fff;color:var(--brand)}footer{min-height:72px;padding:18px max(24px,calc((100% - var(--max))/2));background:#101715;color:#dbe2df;display:flex;justify-content:space-between;gap:20px;align-items:center}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}@media(max-width:760px){.site-header{align-items:flex-start}.site-header nav{flex-direction:column;gap:4px;text-align:right}.hub-shell,.article-shell{width:min(100% - 32px,var(--max))}.hub-hero{padding:44px 16px}.topic-grid,.related-grid{grid-template-columns:1fr}.topic-link{min-height:auto}.cta-band{align-items:stretch;flex-direction:column}.cta-actions{flex-direction:column}footer{align-items:flex-start;flex-direction:column}}