:root{--bg:#fff;--deep:#f5f7fa;--panel:#fff;--soft:#eef1f6;--title:#0a1628;--text:#1e2a3a;--muted:#4a5568;--aux:#718096;--blue:#0033a0;--bright:#0052cc;--navy:#002066;--border:rgba(0,51,160,.14);--shadow:0 12px 36px rgba(0,33,102,.08);--radius:14px;--head:134px}*{box-sizing:border-box}html{scroll-behavior:smooth}html.panel-open,html.panel-open body{overflow:hidden}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.85;overflow-x:hidden}.wrap{width:min(1220px,calc(100% - 40px));margin:0 auto}.skip-link{position:fixed;left:12px;top:-60px;background:var(--navy);color:#fff;padding:8px 14px;z-index:9999}.skip-link:focus{top:8px}.site-header{position:fixed;z-index:80;top:0;left:0;right:0;background:#fff}.brand-line{height:22px;background:var(--navy);color:#fff;font-size:12px}.brand-line-inner{height:22px;display:flex;align-items:center;justify-content:space-between}.text-btn{border:0;background:transparent;color:#fff;min-height:22px;padding:0 8px;cursor:pointer}.masthead{height:68px;border-bottom:1px solid var(--border);background:#fff}.masthead-inner{height:68px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}.brand-mark{justify-self:start;color:var(--navy);text-decoration:none;display:flex;align-items:center;min-height:44px}.brand-logo{display:block;max-height:36px;max-width:150px;width:auto;height:auto;object-fit:contain}.brand-fallback{font-size:28px;font-weight:900;letter-spacing:-1px}.catalog-btn,.app-link{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;padding:0 18px;font-weight:700;text-decoration:none}.catalog-btn{border:1px solid var(--blue);background:#fff;color:var(--blue);cursor:pointer}.app-link{justify-self:end;background:linear-gradient(135deg,var(--bright),var(--blue),var(--navy));color:#fff}.tabbar{height:44px;background:var(--deep);border-bottom:1px solid var(--border)}.tabbar-inner{height:44px;display:flex;align-items:center;gap:8px}.tab-link{height:30px;padding:0 12px;display:inline-flex;align-items:center;color:var(--text);text-decoration:none;border-radius:6px;font-size:14px}.tab-link.is-current{background:var(--blue);color:#fff}.site-main{padding-top:calc(var(--head) + 28px);min-height:70vh}.page-hero{padding:34px 0 12px}.eyebrow{font-size:13px;font-weight:800;letter-spacing:.12em;color:var(--blue)}h1,h2,h3{color:var(--title);line-height:1.35;margin-top:0}h1{font-size:clamp(28px,3vw,32px);margin:8px 0 14px}h2{font-size:24px}h3{font-size:19px}p{margin:0 0 16px}.lead{max-width:900px;font-size:17px;color:var(--muted)}.section{padding:28px 0}.section.soft{background:var(--deep)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:20px}.section-head p{max-width:700px;color:var(--muted);margin:0}.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{border:1px solid var(--border);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);padding:22px}.card p:last-child{margin-bottom:0}.card a,.inline-link{color:var(--blue);font-weight:700;text-decoration-thickness:1px;text-underline-offset:3px}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}.btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:10px;text-decoration:none;font-weight:800}.btn.primary{color:#fff;background:linear-gradient(135deg,var(--bright),var(--blue),var(--navy))}.btn.secondary{color:var(--blue);border:1px solid var(--blue);background:#fff}.media-slot{width:100%;min-height:180px;max-height:300px;background:var(--soft);border:1px solid var(--border);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{max-width:100%;max-height:100%;width:100%;height:auto;object-fit:contain;object-position:center;display:block}.media-slot.tall{max-height:420px;min-height:280px}.media-slot.compact{height:210px;min-height:180px}.hero-image{min-height:200px;max-height:300px}.hero-image img{max-height:300px}.feature-stack{display:grid;gap:18px}.number-list{display:grid;gap:14px}.number-item{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:18px 0;border-top:1px solid var(--border)}.number-item:first-child{border-top:0}.number{font-size:32px;font-weight:900;color:var(--blue);line-height:1}.timeline{position:relative;padding-left:24px}.timeline:before{content:"";position:absolute;left:7px;top:9px;bottom:12px;width:2px;background:var(--border)}.timeline-item{position:relative;padding:0 0 24px 18px}.timeline-item:before{content:"";position:absolute;left:-22px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 5px #eef3ff}.status{display:inline-block;padding:4px 8px;border-radius:6px;background:#e8efff;color:var(--navy);font-size:13px;font-weight:800}.shelf-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.shelf-item{padding:18px;border-left:4px solid var(--blue);background:var(--deep);border-radius:0 10px 10px 0}.tag-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.tag-card{padding:18px;border:1px solid var(--border);border-radius:10px;background:#fff}.tag-card:nth-child(even){border-top:4px solid var(--navy)}.tag-card:nth-child(odd){border-top:4px solid var(--bright)}.tag-card a{color:var(--blue);font-weight:800}.article-body{max-width:920px}.article-body h2{margin-top:34px}.article-body p{color:var(--text)}.faq-list{display:grid;gap:14px}.faq-item{border:1px solid var(--border);border-radius:12px;padding:20px;background:#fff}.faq-item h2{font-size:19px;margin-bottom:10px}.site-footer{margin-top:46px;background:#0a1628;color:#a0aec0;padding:42px 0 86px}.footer-grid{display:grid;grid-template-columns:1.7fr repeat(4,1fr);gap:28px}.footer-brand p{max-width:420px}.footer-logo-row{display:flex;align-items:center;gap:10px;color:#fff;margin-bottom:14px}.footer-logo{max-height:32px;max-width:130px;object-fit:contain}.site-footer h2{font-size:15px;color:#fff;margin-bottom:12px}.site-footer a{display:block;color:#d8e1ee;text-decoration:none;margin:6px 0}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px}.page-overlay{position:fixed;inset:0;background:rgba(10,22,40,.55);z-index:100;visibility:hidden;pointer-events:none;opacity:0;transition:.18s}.page-overlay.is-open{visibility:visible;pointer-events:auto;opacity:1}.catalog-panel,.search-layer{position:fixed;z-index:110;left:0;right:0;top:90px;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-12px);transition:.18s}.catalog-panel.is-open,.search-layer.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:translateY(0)}.catalog-inner,.search-card{background:#fff;border:1px solid var(--border);box-shadow:0 24px 70px rgba(0,33,102,.18);border-radius:0 0 16px 16px;max-height:calc(100vh - 110px);overflow:auto}.catalog-inner{padding:20px}.catalog-head,.search-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.catalog-brand{display:flex;align-items:center;gap:10px}.catalog-logo{max-height:30px;max-width:120px;object-fit:contain}.close-btn{min-height:44px;padding:0 14px;border:1px solid var(--blue);background:#fff;color:var(--blue);border-radius:10px;font-weight:800;cursor:pointer}.catalog-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-top:18px}.catalog-grid h2{font-size:16px}.catalog-grid a{display:block;padding:11px 0;color:var(--title);text-decoration:none;border-top:1px solid var(--border)}.catalog-grid b{display:block;color:var(--blue)}.catalog-grid span{display:block;font-size:13px;color:var(--muted);line-height:1.6}.search-layer{display:flex;justify-content:center}.search-card{width:min(760px,calc(100% - 32px));padding:24px}.search-head h2{margin:4px 0 0}.search-field{margin-top:20px}.search-field label{display:block;font-weight:800;margin-bottom:8px}.search-field input{width:100%;min-height:46px;border:1px solid var(--border);border-radius:10px;padding:0 13px;font:inherit}.search-field span{display:block;color:var(--aux);font-size:13px;margin-top:7px}.preset-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.preset-links a{min-height:44px;padding:0 14px;display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:9px;color:var(--blue);text-decoration:none}.mobile-bottom{display:none}.catalog-btn:focus-visible,.app-link:focus-visible,.tab-link:focus-visible,.btn:focus-visible,.close-btn:focus-visible,.site-footer a:focus-visible,.preset-links a:focus-visible{outline:3px solid rgba(0,82,204,.35);outline-offset:2px}@media(max-width:900px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-brand{grid-column:1/-1}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tag-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.shelf-list{grid-template-columns:1fr 1fr}}@media(max-width:760px){:root{--head:90px}.wrap{width:calc(100% - 32px)}.tabbar{display:none}.masthead-inner{grid-template-columns:1fr auto 1fr;gap:8px}.brand-logo{max-width:98px;max-height:32px}.catalog-btn,.app-link{padding:0 12px;font-size:14px}.site-main{padding-top:calc(var(--head) + 18px)}.grid-2,.grid-4{grid-template-columns:1fr}.tag-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.shelf-list{grid-template-columns:1fr}.section{padding:22px 0}.section-head{align-items:start;flex-direction:column;gap:8px}.footer-grid{grid-template-columns:1fr 1fr;gap:20px}.site-footer{padding-bottom:96px}.catalog-panel,.search-layer{top:90px}.catalog-panel{bottom:0}.catalog-inner{width:100%;max-height:calc(100vh - 90px);height:100%;border-radius:0}.catalog-grid{grid-template-columns:1fr}.search-layer{inset:90px 0 0;background:var(--deep)}.search-card{width:100%;height:100%;max-height:none;border-radius:0;border-left:0;border-right:0}.mobile-bottom{position:fixed;z-index:70;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--border)}.mobile-bottom a{min-height:50px;display:flex;align-items:center;justify-content:center;text-decoration:none;color:var(--text);font-size:13px}.mobile-bottom a.is-current{background:var(--blue);color:#fff}.number-item{grid-template-columns:50px 1fr}.number{font-size:26px}.media-slot.compact{height:190px}.hero-image{min-height:170px}.footer-grid>div:nth-child(5){grid-column:1/-1}}@media(max-width:420px){.brand-fallback{font-size:24px}.catalog-btn,.app-link{padding:0 9px}.tag-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-grid>div:nth-child(5){grid-column:auto}}


/* 图片显示最终约束 */
.media-slot{overflow:visible;min-height:0;max-height:none;height:auto;padding:0}
.media-slot img{display:block;max-width:100%;width:100%;height:100%;max-height:100%;object-fit:contain;object-position:center}
.hero-image{height:clamp(220px,24vw,300px);min-height:0;max-height:300px}
.media-slot.compact{height:clamp(180px,18vw,240px);min-height:0;max-height:240px}
.media-slot.tall{width:min(100%,360px);height:min(420px,70vw);max-height:420px;min-height:0;margin-inline:auto}
.brand-logo{height:auto;max-height:36px;width:auto;max-width:150px;object-fit:contain}
.catalog-logo{height:auto;max-height:30px;width:auto;max-width:120px;object-fit:contain}
.footer-logo{height:auto;max-height:32px;width:auto;max-width:130px;object-fit:contain}
@media(max-width:760px){
  .hero-image{height:clamp(150px,52vw,220px);max-height:220px}
  .media-slot.compact{height:clamp(130px,45vw,190px);max-height:190px}
  .media-slot.tall{width:min(100%,290px);height:min(340px,88vw);max-height:340px}
  .brand-logo{max-height:32px}.catalog-logo{max-height:30px}.footer-logo{max-height:30px}
}
@media(max-width:420px){
  .hero-image{height:clamp(140px,50vw,200px)}
  .media-slot.compact{height:clamp(125px,44vw,175px)}
}