:root{
  --bg:#FFFFFF;--deep-bg:#F5F7FA;--content:#FFFFFF;--secondary:#EEF1F6;
  --title:#0A1628;--text:#1E2A3A;--muted:#4A5568;--soft:#718096;
  --blue:#0033A0;--bright:#0052CC;--deep:#002066;--border:rgba(0,51,160,.14);
  --shadow:0 12px 36px rgba(0,33,102,.08);--radius:14px;--shell:1220px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75;overflow-x:hidden}body.ui-locked{overflow:hidden}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid rgba(0,82,204,.28);outline-offset:2px}button{font:inherit}img{max-width:100%;display:block}.site-shell{width:min(calc(100% - 32px),var(--shell));margin:0 auto}.spine-line{position:fixed;left:0;right:0;top:0;height:18px;background:var(--deep);color:#fff;z-index:1002}.spine-inner{height:18px;display:flex;align-items:center;justify-content:space-between;font-size:11px;line-height:1}.spine-search{height:18px;padding:0 6px;border:0;background:transparent;color:#fff;cursor:pointer;font-size:11px}.book-header{position:fixed;top:18px;left:0;right:0;height:60px;background:#fff;border-bottom:1px solid var(--border);z-index:1001}.book-header-inner{height:60px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}.brand-home{display:inline-flex;align-items:center;justify-self:start;min-height:44px}.brand-logo{height:34px;max-width:150px;width:auto;object-fit:contain}.brand-wordmark{font-size:27px;font-weight:800;letter-spacing:-.03em;color:var(--deep)}.catalog-toggle,.app-link{min-height:44px;border-radius:10px}.catalog-toggle{justify-self:center;border:1px solid var(--border);background:#fff;color:var(--deep);padding:0 18px;cursor:pointer;font-weight:700}.app-link{justify-self:end;display:inline-flex;align-items:center;padding:0 16px;background:linear-gradient(135deg,#0052CC 0%,#0033A0 50%,#002066 100%);color:#fff;font-weight:700}.app-link:hover{text-decoration:none;filter:brightness(1.04)}.tab-strip{position:fixed;top:78px;left:0;right:0;height:40px;background:var(--deep-bg);border-bottom:1px solid var(--border);z-index:1000}.tab-inner{display:flex;height:40px;align-items:center;gap:6px}.tab-link{height:30px;display:inline-flex;align-items:center;padding:0 12px;color:var(--text);border-radius:6px;font-size:14px}.tab-link.is-current{background:var(--blue);color:#fff;text-decoration:none}.page-main{padding-top:146px;min-height:60vh;padding-bottom:56px}.page-hero{margin-bottom:34px}.eyebrow{margin:0 0 6px;color:var(--blue);font-size:13px;font-weight:800;letter-spacing:.1em}.page-hero h1,.cover-copy h1{margin:0;color:var(--title);font-size:clamp(28px,3vw,32px);line-height:1.28}.lead{max-width:860px;margin:12px 0 0;color:var(--muted);font-size:17px}.section{margin:36px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:18px}.section h2,.section-head h2{margin:0;color:var(--title);font-size:24px;line-height:1.35}.section-head p{margin:0;color:var(--soft);font-size:14px}.cover-shell{display:grid;gap:20px}.cover-media{max-height:300px}.media-frame{width:100%;min-height:180px;border:1px solid var(--border);background:var(--deep-bg);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;overflow:hidden}.content-media{width:100%;height:auto;max-height:240px;object-fit:contain;object-position:center}.banner-media{width:100%;height:auto;max-height:300px;object-fit:contain;object-position:center}.app-media{width:100%;height:auto;max-height:420px;object-fit:contain;object-position:center}.media-placeholder{background:linear-gradient(180deg,#F7F9FC,#EEF3FA)}.media-placeholder span{font-size:38px;color:var(--deep);font-weight:850;letter-spacing:-.04em}.cover-copy{max-width:900px}.cover-copy .small-brand{color:var(--blue);font-weight:800;margin:0 0 4px}.cover-copy p{margin:12px 0;color:var(--muted)}.action-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.btn-primary,.btn-secondary{min-height:44px;padding:9px 16px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-weight:800}.btn-primary{background:linear-gradient(135deg,#0052CC 0%,#0033A0 50%,#002066 100%);color:#fff}.btn-primary:hover{text-decoration:none}.btn-secondary{background:#fff;color:var(--blue);border:1px solid var(--blue)}.btn-secondary:hover{text-decoration:none;background:#F7FAFF}.page-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.page-card{border:1px solid var(--border);background:#fff;border-radius:12px;padding:18px;min-height:132px;box-shadow:var(--shadow)}.page-card b{display:block;color:#fff;background:var(--bright);width:max-content;padding:3px 8px;border-radius:6px;margin-bottom:10px;font-size:13px}.page-card:nth-child(even) b{background:var(--deep)}.page-card h3{margin:0 0 8px;color:var(--title);font-size:18px}.page-card p{margin:0 0 8px;color:var(--muted);font-size:14px}.numbered-focus{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px;align-items:start}.number-list{border-top:2px solid var(--blue)}.number-item{display:grid;grid-template-columns:68px 1fr;gap:12px;padding:16px 0;border-bottom:1px solid var(--border)}.number-item .num,.big-num{font-size:30px;line-height:1;font-weight:850;color:var(--blue);letter-spacing:-.05em}.number-item h3{margin:0;color:var(--title);font-size:19px}.number-item p{margin:5px 0 0;color:var(--muted)}.four-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.content-card{border:1px solid var(--border);border-radius:var(--radius);background:#fff;overflow:hidden;box-shadow:var(--shadow)}.content-card .media-frame{border:0;border-bottom:1px solid var(--border);border-radius:0;min-height:190px}.content-card-body{padding:16px}.content-card h3{margin:0 0 6px;color:var(--title);font-size:19px}.content-card p{margin:0;color:var(--muted);font-size:14px}.six-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.tag-card{background:var(--secondary);border:1px solid var(--border);border-radius:12px;padding:16px}.tag-card h3{margin:0;color:var(--title);font-size:17px}.tag-card p{margin:6px 0 10px;color:var(--muted);font-size:14px}.shelf-list{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff}.shelf-row{display:grid;grid-template-columns:160px 1fr auto;gap:18px;align-items:center;padding:18px;border-bottom:1px solid var(--border)}.shelf-row:last-child{border-bottom:0}.shelf-row strong{color:var(--title)}.shelf-row p{margin:4px 0 0;color:var(--muted)}.shelf-row a{min-height:44px;display:inline-flex;align-items:center}.rank-list{display:grid;gap:10px}.rank-item{display:grid;grid-template-columns:72px 1fr;gap:16px;border:1px solid var(--border);border-radius:12px;padding:16px;background:#fff}.rank-item h3{margin:0 0 4px;color:var(--title)}.rank-item p{margin:0;color:var(--muted)}.status-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.status-card{padding:18px;border-radius:12px;border:1px solid var(--border);background:var(--deep-bg)}.status-card .status{display:inline-block;background:var(--blue);color:#fff;padding:3px 8px;border-radius:6px;font-size:12px;font-weight:800}.status-card h3{margin:10px 0 6px;color:var(--title)}.status-card p{margin:0;color:var(--muted);font-size:14px}.split{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:22px;align-items:start}.prose{max-width:920px}.prose p{margin:0 0 16px;color:var(--text)}.prose h2{margin:34px 0 12px;color:var(--title);font-size:23px}.prose h3{margin:22px 0 8px;color:var(--title);font-size:19px}.editor-note{border-left:4px solid var(--blue);background:var(--deep-bg);padding:16px 18px;border-radius:0 10px 10px 0;color:var(--muted)}.editor-note strong{color:var(--deep)}.feature-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.feature-strip article{border-top:3px solid var(--blue);background:#fff;padding:16px;border-radius:0 0 12px 12px;box-shadow:var(--shadow)}.feature-strip h3{margin:0;color:var(--title)}.feature-strip p{margin:6px 0 0;color:var(--muted)}.app-layout{display:grid;grid-template-columns:330px minmax(0,1fr);gap:28px;align-items:center}.app-icon-row{display:flex;gap:14px;align-items:center;margin:12px 0}.app-icon-row img{width:64px;height:64px;object-fit:contain}.app-icon-placeholder{width:64px;height:64px;border-radius:14px;background:var(--secondary);display:flex;align-items:center;justify-content:center;color:var(--blue);font-weight:850}.faq-list{display:grid;gap:12px}.faq-item{border:1px solid var(--border);border-radius:12px;padding:18px;background:#fff}.faq-item h2,.faq-item h3{margin:0 0 8px;color:var(--title);font-size:18px}.faq-item p{margin:0;color:var(--muted)}.policy-list{display:grid;gap:14px}.policy-item{border:1px solid var(--border);border-radius:12px;padding:18px;background:#fff}.policy-item h2,.policy-item h3{margin:0 0 8px;color:var(--title);font-size:19px}.policy-item p{margin:0;color:var(--muted)}.index-links{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.index-link{display:block;border:1px solid var(--border);border-radius:12px;padding:16px;background:#fff}.index-link strong{color:var(--title);font-size:18px}.index-link p{margin:5px 0 0;color:var(--muted)}.site-footer{background:#0A1628;color:#A0AEC0;padding:36px 0 30px}.footer-top{display:grid;gap:24px}.footer-brand{display:flex;align-items:center;gap:14px}.footer-logo{filter:none}.footer-brand strong{display:block;color:#fff;font-size:20px}.footer-brand span{display:block;color:#A0AEC0;font-size:12px}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.footer-groups section{display:flex;flex-direction:column;gap:5px}.footer-groups h2{color:#fff;font-size:15px;margin:0 0 6px}.footer-groups a{color:#CBD5E0}.footer-note,.footer-copy{margin:0;font-size:13px;color:#A0AEC0}.ui-overlay{position:fixed;inset:0;background:rgba(3,12,28,.42);z-index:1090;opacity:0;visibility:hidden;pointer-events:none;transition:.18s}.ui-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.catalog-panel,.search-panel{position:fixed;left:0;right:0;top:78px;z-index:1100;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-8px);transition:.2s ease}.catalog-panel.is-open,.search-panel.is-open{opacity:1;visibility:visible;pointer-events:auto;transform:none}.catalog-shell,.search-card{background:#fff;border:1px solid var(--border);box-shadow:var(--shadow);max-height:50vh;overflow:auto;border-radius:0 0 14px 14px}.catalog-head,.search-head{position:sticky;top:0;background:#fff;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 18px;border-bottom:1px solid var(--border);z-index:2}.catalog-brand{display:flex;align-items:center;gap:10px;color:var(--title)}.catalog-logo{height:28px}.close-control{min-width:44px;min-height:44px;background:#fff;color:var(--blue);border:1px solid var(--border);border-radius:9px;cursor:pointer}.catalog-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:0}.catalog-groups section{padding:16px;border-right:1px solid var(--border)}.catalog-groups section:last-child{border-right:0}.catalog-groups h2{margin:0 0 10px;color:var(--title);font-size:16px}.catalog-groups a{display:block;padding:9px 0;border-bottom:1px dashed var(--border)}.catalog-groups a:last-child{border-bottom:0}.catalog-groups strong{display:block;color:var(--deep);font-size:15px}.catalog-groups span{display:block;color:var(--muted);font-size:12px;line-height:1.5;margin-top:2px}.search-card{padding-bottom:18px}.search-appearance{padding:18px}.search-appearance span{display:block;color:var(--soft);font-size:12px;margin-bottom:6px}.fake-search{min-height:46px;border:1px solid var(--border);border-radius:10px;background:var(--deep-bg);display:flex;align-items:center;padding:0 14px;color:var(--muted)}.search-links{display:flex;flex-wrap:wrap;gap:8px;padding:0 18px}.search-links a{min-height:44px;padding:8px 14px;display:inline-flex;align-items:center;border:1px solid var(--blue);border-radius:9px;background:#fff;color:var(--blue)}.mobile-bottom{display:none}
@media(max-width:900px){.page-cards,.six-grid{grid-template-columns:repeat(2,1fr)}.four-grid{grid-template-columns:repeat(2,1fr)}.numbered-focus,.split,.app-layout{grid-template-columns:1fr}.status-grid{grid-template-columns:repeat(2,1fr)}.catalog-groups{grid-template-columns:repeat(2,1fr)}.catalog-groups section:nth-child(2){border-right:0}.catalog-groups section:nth-child(-n+2){border-bottom:1px solid var(--border)}.app-layout .media-frame{max-width:360px}}
@media(max-width:700px){.site-shell{width:calc(100% - 32px)}.tab-strip{display:none}.page-main{padding-top:100px;padding-bottom:82px}.book-header-inner{grid-template-columns:1fr auto 1fr;gap:6px}.brand-logo{height:30px;max-width:112px}.brand-wordmark{font-size:23px}.catalog-toggle,.app-link{padding:0 10px;font-size:14px}.catalog-panel,.search-panel{top:78px}.catalog-shell,.search-card{width:100%;max-height:66vh;border-radius:0}.catalog-groups{grid-template-columns:1fr}.catalog-groups section{border-right:0;border-bottom:1px solid var(--border)!important}.catalog-groups section:last-child{border-bottom:0!important}.page-cards,.four-grid,.six-grid,.status-grid,.feature-strip,.footer-groups,.index-links{grid-template-columns:1fr}.shelf-row{grid-template-columns:1fr;gap:6px}.rank-item{grid-template-columns:60px 1fr}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:1005;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--border)}.mobile-bottom-link{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;min-height:50px}.mobile-bottom-link.is-current{background:var(--blue);color:#fff;text-decoration:none}.site-footer{padding-bottom:90px}.section{margin:30px 0}.footer-brand{align-items:flex-start}.page-hero h1,.cover-copy h1{font-size:28px}.section h2,.section-head h2{font-size:22px}.numbered-focus{gap:14px}.number-item{grid-template-columns:56px 1fr}.media-frame{min-height:160px}.content-card .media-frame{min-height:180px}}
@media(max-width:390px){.catalog-toggle,.app-link{padding:0 8px;font-size:13px}.brand-home{min-width:70px}.brand-wordmark{font-size:21px}.number-item{grid-template-columns:50px 1fr}.number-item .num,.big-num{font-size:26px}}

.content-card .content-media{max-height:220px}