:root{
  --bg:#F5FAFE;
  --bg-deep:#E7F2FA;
  --surface:#FFFFFF;
  --surface-2:#D7EAF6;
  --title:#16324A;
  --text:#2A4156;
  --muted:#4E6A80;
  --aux:#6E8899;
  --brand:#4AA3E0;
  --bright:#6BB8EC;
  --deep:#1B4A6E;
  --mist:#EAF5FC;
  --line:rgba(74,163,224,.16);
  --line-strong:rgba(74,163,224,.42);
  --shadow:0 12px 28px rgba(27,74,110,.08);
  --radius:12px;
  --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
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:15px;line-height:1.7;overflow-x:hidden}
body.lock-scroll{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%}
.shell{width:min(calc(100% - 32px),var(--max));margin:0 auto}
.skip-link{position:fixed;left:16px;top:-60px;z-index:1000;background:var(--deep);color:#fff;padding:8px 12px;border-radius:8px}
.skip-link:focus{top:8px}
.site-header{position:fixed;inset:0 0 auto 0;z-index:200}
.thinbar{height:22px;background:var(--deep);color:#fff;font-size:12px}
.thinbar-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.thinbar-brand{white-space:nowrap;letter-spacing:.02em}
.top-search-btn{position:relative;height:22px;min-width:44px;border:0;background:transparent;color:#fff;padding:0 4px;font-size:12px}
.magbar{height:60px;background:var(--surface);border-bottom:1px solid var(--line)}
.magbar-inner{height:60px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.brand-mark{justify-self:start;display:flex;align-items:center;min-height:44px;max-width:150px}
.brand-mark img,.footer-logo-row img,.drawer-brand img{height:28px;width:auto;object-fit:contain;object-position:center}
.brand-text,.footer-logo-text{font-size:20px;font-weight:800;color:var(--title)}
.drawer-trigger{justify-self:center;min-height:44px;min-width:76px;border:1px solid var(--line-strong);border-radius:10px;background:var(--mist);color:var(--deep);font-size:14px;font-weight:700}
.app-entry{justify-self:end;min-height:44px;display:inline-flex;align-items:center;padding:0 14px;border-radius:10px;background:linear-gradient(135deg,var(--bright) 0%,var(--brand) 55%,var(--deep) 100%);color:#fff;font-size:14px;font-weight:700}
.tabbar{height:40px;background:var(--mist);border-bottom:1px solid var(--line)}
.tabbar-inner{height:40px;display:flex;align-items:center;justify-content:center;gap:8px}
.tab-link{position:relative;height:40px;min-width:76px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px;color:var(--deep);font-size:13px}
.tab-link.is-current{background:var(--brand);color:#fff}
.site-main{padding-top:138px;padding-bottom:48px;min-height:70vh}
.hero,.page-hero{padding:26px 0 18px}
.hero-copy,.page-hero-copy{max-width:840px;margin:18px auto 0;text-align:center}
.eyebrow{display:inline-block;margin-bottom:8px;color:var(--brand);font-size:13px;font-weight:800;letter-spacing:.08em}
h1,h2,h3,p{margin-top:0}
h1{margin-bottom:12px;color:var(--title);font-size:24px;line-height:1.3}
h2{margin-bottom:12px;color:var(--title);font-size:20px;line-height:1.4}
h3{margin-bottom:8px;color:var(--title);font-size:16px;line-height:1.45}
p{margin-bottom:12px}
.lede{max-width:780px;margin:0 auto;color:var(--muted)}
.media-slot{width:100%;height:180px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--mist);border:1px solid var(--line);border-radius:var(--radius)}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.banner-slot{height:260px}
.benqi-slot{height:200px}
.app-slot{height:360px}
.icon-slot{width:72px;height:72px;margin:0 auto 14px}
.icon-slot img{width:48px;height:48px;object-fit:contain}
.hero-actions,.card-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:18px}
.btn{min-height:44px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap;border:1px solid transparent}
.btn-primary{background:linear-gradient(135deg,var(--bright) 0%,var(--brand) 55%,var(--deep) 100%);color:#fff}
.btn-secondary{background:#fff;border-color:var(--line-strong);color:var(--deep)}
.btn:hover,.app-entry:hover,.drawer-trigger:hover,.tab-link:hover,.mobile-bottom a:hover{filter:brightness(.98)}
.btn:focus-visible,.app-entry:focus-visible,.drawer-trigger:focus-visible,.tab-link:focus-visible,.top-search-btn:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(74,163,224,.28);outline-offset:2px}
.section{padding:26px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}
.section-head p{margin:0;color:var(--muted);max-width:640px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.card .media-slot{margin-bottom:14px}
.card p:last-child{margin-bottom:0}
.soft-card{background:var(--mist);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.number-card{position:relative;padding-top:52px}
.big-number{position:absolute;left:18px;top:14px;color:var(--brand);font-size:28px;font-weight:900;line-height:1}
.feature-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:18px;align-items:start}
.feature-copy{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.index-list,.check-list,.plain-list{list-style:none;margin:0;padding:0}
.index-list li,.check-list li,.plain-list li{padding:10px 0;border-bottom:1px solid var(--line)}
.index-list li:last-child,.check-list li:last-child,.plain-list li:last-child{border-bottom:0}
.index-row{display:flex;align-items:flex-start;gap:12px}
.index-no{flex:0 0 32px;color:var(--brand);font-weight:900}
.shelf{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
.shelf a{display:block;min-height:130px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px;box-shadow:var(--shadow)}
.shelf a strong{display:block;color:var(--title);margin-bottom:8px}
.shelf a span{display:block;color:var(--muted);font-size:13px;line-height:1.6}
.timeline{position:relative;margin:0;padding:0 0 0 26px;list-style:none}
.timeline:before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:var(--surface-2)}
.timeline li{position:relative;padding:0 0 22px 18px}
.timeline li:before{content:"";position:absolute;left:-24px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--brand);border:3px solid var(--mist)}
.timeline strong{display:block;color:var(--title);margin-bottom:5px}
.status{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:var(--mist);border:1px solid var(--line);color:var(--deep);font-size:12px;font-weight:700}
.article{max-width:860px;margin:0 auto}
.article-section{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:16px;box-shadow:var(--shadow)}
.article-section p:last-child{margin-bottom:0}
.article-note{padding:16px 18px;background:var(--mist);border-left:4px solid var(--brand);border-radius:10px;color:var(--deep)}
.definition-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.definition-grid .soft-card h3{margin-bottom:6px}
.qa-list{display:grid;gap:14px}
.qa-item{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.qa-item h2{font-size:17px;margin-bottom:8px}
.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.notice{background:var(--bg-deep);border:1px solid var(--line);border-radius:12px;padding:16px;color:var(--deep)}
.site-footer{background:var(--deep);color:#E7F2FA;border-top:1px solid rgba(234,245,252,.35);padding:30px 0 calc(20px + env(safe-area-inset-bottom));font-size:13px}
.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:20px}
.footer-logo-row{display:flex;align-items:center;gap:12px;font-weight:800;margin-bottom:12px}
.footer-brand p{max-width:420px;color:#D7EAF6}
.footer-col h2{font-size:14px;color:#fff;margin-bottom:8px}
.footer-col a{display:block;color:#E7F2FA;padding:4px 0}
.footer-bottom{margin-top:20px;padding-top:14px;border-top:1px solid rgba(234,245,252,.22);color:#D7EAF6}
.overlay{position:fixed;inset:0;z-index:300;background:rgba(22,50,74,.42);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s ease}
.overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}
.drawer{position:fixed;z-index:400;top:0;right:0;width:min(400px,86vw);height:100dvh;background:#fff;transform:translateX(104%);visibility:hidden;pointer-events:none;transition:transform .25s ease,visibility .25s ease;box-shadow:-18px 0 44px rgba(27,74,110,.16);display:flex;flex-direction:column}
.drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}
.drawer-head{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line)}
.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title)}
.icon-btn{min-width:52px;min-height:44px;border:1px solid var(--line-strong);border-radius:10px;background:#fff;color:var(--deep)}
.drawer-scroll{overflow-y:auto;padding:10px 16px 24px}
.drawer-group{padding:10px 0}
.drawer-group h2{font-size:13px;color:var(--aux);margin-bottom:6px}
.drawer-group a{display:block;padding:10px 8px;border-radius:10px}
.drawer-group a:hover{background:var(--mist)}
.drawer-group strong{display:block;color:var(--title);font-size:14px}
.drawer-group span{display:block;color:var(--muted);font-size:12px;line-height:1.55;margin-top:2px}
.search-panel{position:fixed;z-index:410;left:50%;top:82px;width:min(720px,calc(100% - 32px));transform:translate(-50%,-20px);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,transform .2s ease,visibility .2s ease}
.search-panel.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}
.search-card{background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;padding:18px;box-shadow:var(--shadow)}
.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}
.search-head strong{font-size:18px;color:var(--title)}
.search-head p{margin:3px 0 0;color:var(--muted);font-size:13px}
.search-label{display:block;color:var(--deep);font-size:13px;margin:14px 0 6px}
.search-input{width:100%;height:44px;border:1px solid var(--line-strong);border-radius:10px;background:#fff;color:var(--title);padding:0 12px}
.search-presets{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}
.search-presets a{min-height:44px;display:flex;align-items:center;justify-content:center;border-radius:10px;background:var(--mist);border:1px solid var(--line);color:var(--deep);font-weight:700}
.search-empty{margin:12px 0 0;color:var(--muted);font-size:13px}
.mobile-bottom{display:none}
.kicker{color:var(--brand);font-weight:800;font-size:13px;margin-bottom:5px}
.meta-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 0}
.meta-pill{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;border-radius:999px;background:var(--mist);border:1px solid var(--line);color:var(--deep);font-size:12px}
.link-arrow{color:var(--deep);font-weight:700}
.link-arrow::after{content:" →"}
.app-panel{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:20px;align-items:center}
.brand-statement{text-align:center;max-width:820px;margin:0 auto}
.code-note{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
@media (max-width:900px){
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .shelf{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:720px){
  body{padding-bottom:calc(64px + env(safe-area-inset-bottom))}
  .shell{width:calc(100% - 32px)}
  .tabbar{display:none}
  .site-main{padding-top:98px;padding-bottom:28px}
  .magbar-inner{grid-template-columns:minmax(72px,1fr) auto minmax(72px,1fr);gap:6px}
  .brand-mark{max-width:96px;overflow:hidden}
  .brand-mark img{max-width:92px;height:28px}
  .drawer-trigger{min-width:68px;padding:0 10px}
  .app-entry{padding:0 10px;font-size:13px}
  .hero,.page-hero{padding-top:18px}
  .banner-slot{height:220px}
  .grid-3,.grid-2,.definition-grid,.contact-grid,.feature-grid,.app-panel{grid-template-columns:1fr}
  .shelf{grid-template-columns:1fr 1fr}
  .section{padding:20px 0}
  .section-head{display:block}
  .section-head p{margin-top:4px}
  .search-panel{inset:0;width:100%;height:100dvh;transform:translateY(16px);background:var(--deep);padding:calc(22px + env(safe-area-inset-top)) 16px 18px;overflow-y:auto}
  .search-panel.is-open{transform:translateY(0)}
  .search-card{min-height:100%;border:0;border-radius:0;background:var(--deep);color:#fff;box-shadow:none;padding:10px 0}
  .search-head strong,.search-head p,.search-label{color:#fff}
  .search-close{background:transparent;border-color:rgba(255,255,255,.35);color:#fff}
  .search-input{background:#fff;color:var(--title)}
  .search-presets{grid-template-columns:1fr 1fr}
  .search-presets a{background:#fff;color:var(--deep);border-color:rgba(255,255,255,.3)}
  .search-empty{color:#E7F2FA}
  .mobile-bottom{position:fixed;z-index:250;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 20px rgba(27,74,110,.08)}
  .mobile-bottom a{min-width:0;height:48px;display:flex;align-items:center;justify-content:center;color:var(--deep);font-size:12px;font-weight:700}
  .mobile-bottom a.is-current{background:var(--brand);color:#fff}
  .drawer{z-index:400}
  .overlay{z-index:300}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:480px){
  .grid-4,.shelf,.footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .banner-slot{height:190px}
  .app-slot{height:320px}
  .card,.article-section,.feature-copy{padding:16px}
  h1{font-size:23px}
}

.mt-14{margin-top:14px}.mt-16{margin-top:16px}.actions-left{justify-content:flex-start}

.top-search-btn::before{content:"";position:absolute;left:0;right:0;top:-11px;bottom:-11px}.tab-link::before{content:"";position:absolute;left:0;right:0;top:-2px;bottom:-2px}