:root{
  --bg:#FFFFFF;--deep:#F5F7FA;--panel:#FFFFFF;--soft:#EEF1F6;
  --ink:#0A1628;--text:#1E2A3A;--muted:#4A5568;--quiet:#718096;
  --blue:#0033A0;--bright:#0052CC;--navy:#002066;--line:rgba(0,51,160,.14);
  --shadow:0 12px 36px rgba(0,33,102,.08);--radius:14px;--max:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
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;line-height:1.75;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
:focus-visible{outline:3px solid rgba(0,82,204,.28);outline-offset:3px}
.top-shell{position:fixed;z-index:60;top:0;left:0;right:0}
.shell-row{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.blue-line{height:22px;background:var(--navy);color:#fff}
.blue-line-inner{height:22px;display:flex;align-items:center;justify-content:space-between;font-size:12px;line-height:1}
.mini-brand{font-weight:700;letter-spacing:.05em}
.line-action{height:22px;border:0;background:transparent;color:#fff;padding:0 6px}
.masthead{height:68px;background:#fff;border-bottom:1px solid var(--line)}
.masthead-inner{height:68px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}
.brand-mark{display:flex;align-items:center;min-width:80px;justify-self:start}
.brand-logo{height:34px;width:auto;max-width:150px;object-fit:contain}
.brand-fallback{font-size:26px;font-weight:900;color:var(--blue);letter-spacing:-.04em}
.catalog-button,.app-link{min-height:44px;border-radius:10px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;font-weight:800}
.catalog-button{border:1px solid var(--blue);background:#fff;color:var(--blue)}
.app-link{justify-self:end;background:linear-gradient(135deg,#0052CC 0%,#0033A0 50%,#002066 100%);color:#fff}
.tab-strip{height:44px;background:var(--deep);border-bottom:1px solid var(--line)}
.tab-strip-inner{height:44px;display:flex;align-items:center;gap:8px;overflow:hidden}
.tab-link{padding:6px 12px;border-radius:8px;font-size:14px;color:var(--muted);font-weight:700;white-space:nowrap}
.tab-link:hover,.tab-link.is-active{background:var(--blue);color:#fff}
.site-main{padding-top:134px}
.page-section{padding:58px 0}
.page-section.soft{background:var(--deep)}
.container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.eyebrow{display:inline-block;color:var(--blue);font-size:13px;font-weight:900;letter-spacing:.08em;margin-bottom:8px}
h1,h2,h3{color:var(--ink);line-height:1.25;margin:0 0 16px}
h1{font-size:clamp(28px,3vw,32px);letter-spacing:-.03em}
h2{font-size:24px}h3{font-size:18px}
p{margin:0 0 16px}
.lead{font-size:17px;color:var(--muted);max-width:820px}
.hero-copy{padding:28px 0 0}.hero-copy p{max-width:780px}
.hero-actions,.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.btn-primary,.btn-secondary{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:10px;font-weight:800}
.btn-primary{background:linear-gradient(135deg,#0052CC 0%,#0033A0 50%,#002066 100%);color:#fff}
.btn-secondary{background:#fff;color:var(--blue);border:1px solid var(--blue)}
.media-slot{background:var(--soft);border:1px solid var(--line);border-radius:16px;min-height:190px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.hero-media{width:100%;min-height:200px;max-height:300px;aspect-ratio:16/9}.hero-media img{max-height:300px}
.section-media{height:220px}.section-media.tall{height:420px;max-width:520px;margin:auto}.section-media.square{height:240px}
.tag-grid,.card-grid,.theme-grid,.index-grid,.info-grid{display:grid;gap:16px}
.tag-grid{grid-template-columns:repeat(6,1fr);margin-top:24px}.tag-card{border-top:4px solid var(--bright);background:#fff;border-radius:12px;padding:18px;border-left:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.tag-card:nth-child(even){border-top-color:var(--navy)}.tag-card p{font-size:14px;color:var(--muted)}.tag-card a{font-weight:800;color:var(--blue)}
.card-grid{grid-template-columns:repeat(3,1fr)}.content-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.content-card .section-media{margin:-18px -18px 18px;width:calc(100% + 36px);border-radius:14px 14px 10px 10px;box-shadow:none}
.number-list{display:grid;gap:12px}.number-item{display:grid;grid-template-columns:68px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}.number-item .num{font-size:34px;line-height:1;font-weight:900;color:var(--bright)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:start}
.theme-grid{grid-template-columns:repeat(3,1fr)}.theme-cell,.shelf-row,.directory-row,.note-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.theme-cell a,.directory-row a{color:var(--blue);font-weight:800}
.shelf-list{display:grid;gap:10px}.shelf-row{display:grid;grid-template-columns:130px 1fr auto;gap:16px;align-items:center}.shelf-row .label{font-weight:900;color:var(--navy)}
.rank-list{display:grid;gap:0}.rank-item{display:grid;grid-template-columns:92px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}.rank-item .rank{font-size:46px;font-weight:900;line-height:1;color:var(--blue)}
.timeline{position:relative;margin-left:18px;border-left:2px solid var(--line);padding-left:28px}.timeline-item{position:relative;padding:0 0 28px}.timeline-item:before{content:"";position:absolute;left:-36px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 5px #fff}.status{display:inline-block;font-size:12px;font-weight:900;color:var(--blue);border:1px solid var(--blue);border-radius:6px;padding:2px 7px;margin-bottom:8px}
.article-head{padding:52px 0 30px}.article-head .lead{margin-top:12px}.article-body{padding:0 0 64px}.prose{max-width:860px}.prose h2{margin-top:34px}.prose h3{margin-top:24px}.prose p{color:var(--text)}.prose .editor-note{border-left:4px solid var(--blue);padding:14px 18px;background:var(--deep);border-radius:0 12px 12px 0;color:var(--muted)}
.index-grid{grid-template-columns:repeat(2,1fr)}.index-card{border:1px solid var(--line);border-radius:14px;padding:20px;background:#fff}.index-card p{color:var(--muted)}
.info-grid{grid-template-columns:repeat(3,1fr)}.info-card{background:var(--deep);border:1px solid var(--line);border-radius:14px;padding:20px}
.faq-list{display:grid;gap:14px}.faq-item{border:1px solid var(--line);border-radius:14px;background:#fff;padding:20px}.faq-item h2{font-size:18px;margin-bottom:10px}.faq-item p{color:var(--muted);margin:0}
.catalog-panel,.search-layer{position:fixed;z-index:90;left:0;right:0;top:90px;visibility:hidden;opacity:0;pointer-events:none;transform:translateY(-10px);transition:.2s ease}
.catalog-panel.is-open,.search-layer.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:none}
.catalog-panel{background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);max-height:calc(100vh - 90px);overflow:auto}
.catalog-wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:22px 0 30px}.catalog-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:16px;border-bottom:1px solid var(--line)}.catalog-brand{display:flex;align-items:center;gap:10px}.catalog-brand img{height:30px;width:auto;object-fit:contain}.catalog-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;padding-top:20px}.catalog-grid section h2{font-size:15px;color:var(--blue);margin-bottom:8px}.catalog-grid section a{display:block;padding:10px 0;border-bottom:1px solid var(--line)}.catalog-grid b{display:block;color:var(--ink);font-size:15px}.catalog-grid span{display:block;color:var(--quiet);font-size:12px;line-height:1.55;margin-top:3px}
.close-button{min-height:44px;padding:0 14px;border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:10px;font-weight:800}
.search-layer{display:flex;justify-content:center}.search-card{width:min(760px,calc(100% - 32px));background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;padding:24px;box-shadow:var(--shadow)}.search-head{display:flex;justify-content:space-between;gap:18px}.search-head h2{margin:0}.search-appearance{margin:22px 0;display:grid;gap:8px}.search-appearance label{font-weight:800}.search-appearance input{min-height:48px;border:1px solid var(--line);border-radius:10px;padding:0 14px;color:var(--text);background:#fff}.search-presets{display:flex;gap:10px;flex-wrap:wrap}.search-presets a{padding:8px 12px;border:1px solid var(--blue);color:var(--blue);border-radius:8px;font-weight:700}
.page-overlay{position:fixed;z-index:80;inset:90px 0 0;background:rgba(10,22,40,.38);opacity:0;pointer-events:none;transition:.2s ease}.page-overlay.is-open{opacity:1;pointer-events:auto}.panel-open{overflow:hidden}
.site-footer{background:var(--ink);color:#A0AEC0;padding:46px 0 90px}.footer-wrap{width:min(var(--max),calc(100% - 32px));margin:0 auto}.footer-brand-row{display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:start;padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.1)}.footer-brand{display:flex;align-items:center;gap:10px;color:#fff}.footer-brand img{height:30px;width:auto;object-fit:contain}.footer-brand strong{font-size:22px}.footer-brand-row p{max-width:720px;margin:0;color:#A0AEC0}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;padding:28px 0}.footer-grid h2{font-size:15px;color:#fff}.footer-grid a{display:block;color:#A0AEC0;padding:4px 0}.footer-grid a:hover{color:#fff}.footer-bottom{display:flex;gap:18px;flex-wrap:wrap;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);font-size:13px}.footer-bottom a{color:#fff}
.mobile-bottom-nav{display:none}
@media (max-width:900px){
  .tag-grid{grid-template-columns:repeat(3,1fr)}.card-grid,.info-grid{grid-template-columns:1fr 1fr}.theme-grid{grid-template-columns:1fr 1fr}.split{grid-template-columns:1fr}.catalog-grid{grid-template-columns:1fr 1fr}.section-media.tall{height:360px}.footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .shell-row,.container,.catalog-wrap,.footer-wrap{width:calc(100% - 32px)}
  .tab-strip{display:none}.site-main{padding-top:90px}.masthead-inner{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:8px}.brand-logo{max-width:104px;height:30px}.catalog-button,.app-link{padding:0 11px;font-size:14px}.app-link{white-space:nowrap}.blue-line-inner{width:calc(100% - 24px)}
  .page-section{padding:42px 0}.tag-grid,.card-grid,.theme-grid,.index-grid,.info-grid{grid-template-columns:1fr}.hero-media{min-height:160px}.section-media{height:200px}.section-media.tall{height:380px}.number-item{grid-template-columns:52px 1fr}.number-item .num{font-size:28px}.rank-item{grid-template-columns:68px 1fr}.rank-item .rank{font-size:36px}.shelf-row{grid-template-columns:1fr}.shelf-row .label{font-size:14px}
  .catalog-panel,.search-layer{top:90px}.catalog-panel{height:calc(100vh - 90px);max-height:none}.catalog-grid{grid-template-columns:1fr;gap:10px}.catalog-grid section a{padding:9px 0}.search-layer{inset:90px 0 0;background:var(--deep);align-items:flex-start}.search-card{width:100%;border:0;border-radius:0;box-shadow:none;background:var(--deep);padding:20px 16px;min-height:100%}.page-overlay{inset:90px 0 0}
  .site-footer{padding-bottom:86px}.footer-brand-row{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.mobile-bottom-nav{position:fixed;z-index:50;left:0;right:0;bottom:0;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr)}.mobile-bottom-nav a{display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;color:var(--muted);min-width:0}.mobile-bottom-nav a.is-active{background:var(--blue);color:#fff}
}
@media (max-width:420px){.footer-grid{grid-template-columns:1fr}.catalog-button,.app-link{font-size:13px;padding:0 9px}.brand-fallback{font-size:23px}}