:root {
    --bg:#0D0D0D;
    --bg-deep:#070707;
    --panel:#171717;
    --panel-2:#222222;
    --text:#C8C8C8;
    --title:#F2F2F2;
    --muted:#9A9A9A;
    --faint:#6E6E6E;
    --silver:#C8C8C8;
    --silver-bright:#E8E8E8;
    --ink:#1A1A1A;
    --red:#B85A5A;
    --border:rgba(232,232,232,.12);
    --border-strong:rgba(232,232,232,.36);
    --shadow:0 12px 28px rgba(0,0,0,.45);
    --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg-deep)}
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}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{color:inherit}
img{display:block;max-width:100%}
.shell{width:min(calc(100% - 32px),var(--max));margin-inline:auto}
.skip-link{position:fixed;left:12px;top:-80px;z-index:300;background:var(--silver-bright);color:var(--bg);padding:10px 14px;border-radius:8px}
.skip-link:focus{top:12px}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.no-scroll{overflow:hidden}
.site-header{position:fixed;inset:0 0 auto 0;z-index:120;box-shadow:0 8px 18px rgba(0,0,0,.22)}
.inkline{height:22px;background:var(--bg-deep);border-bottom:1px solid var(--border)}
.inkline-inner{height:22px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--silver)}
.inkline-search{min-width:54px;height:22px;border:0;background:transparent;padding:0 6px;cursor:pointer;font-size:12px;color:var(--silver)}
.material-bar{height:60px;background:var(--ink);border-bottom:1px solid var(--border)}
.material-bar-inner{height:60px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}
.material-logo{justify-self:start;display:flex;align-items:center;min-height:44px;font-weight:700;font-size:16px;color:var(--title)}
.brand-logo{height:28px;width:auto;object-fit:contain;object-position:center}
.drawer-trigger,.app-link{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;font-size:14px}
.drawer-trigger{justify-self:center;border:1px solid var(--border-strong);background:var(--bg);padding:0 20px;cursor:pointer}
.app-link{justify-self:end;padding:0 16px;background:linear-gradient(135deg,#E8E8E8 0%,#C8C8C8 55%,#8A8A8A 100%);color:var(--bg);font-weight:700}
.case-tabs{height:40px;background:var(--bg-deep);border-bottom:1px solid var(--border)}
.case-tabs-inner{height:40px;display:flex;align-items:center;justify-content:center;gap:8px}
.case-tabs a{height:30px;min-width:84px;padding:0 16px;display:flex;align-items:center;justify-content:center;border-radius:8px;font-size:13px;color:var(--text)}
.case-tabs a.is-active,.case-tabs a:hover{background:var(--silver);color:var(--bg)}
.site-main{padding-top:122px;min-height:70vh}
.page-section{padding:34px 0}
.page-section + .page-section{border-top:1px solid var(--border)}
.hero-section{padding:34px 0 20px}
.hero-slot,.image-slot{background:var(--ink);border:1px solid var(--border);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.hero-slot{width:100%;height:260px}
.hero-slot img,.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.image-slot{height:200px}
.image-slot.compact{height:180px}
.image-slot.app-vertical{height:min(360px,64vw)}
.hero-copy{padding-top:24px;max-width:830px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--silver-bright);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--red)}
h1{font-size:24px;line-height:1.3;color:var(--title);margin:8px 0 14px}
h2{font-size:20px;line-height:1.4;color:var(--title);margin:0 0 12px}
h3{font-size:16px;line-height:1.45;color:var(--title);margin:0 0 8px}
p{margin:0 0 14px}
.lead{font-size:16px;color:var(--silver);max-width:850px}
.meta-line{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;color:var(--muted);font-size:13px}
.meta-line span{border:1px solid var(--border);border-radius:999px;padding:4px 10px;background:var(--panel)}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.btn{min-height:42px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,#E8E8E8 0%,#C8C8C8 55%,#8A8A8A 100%);color:var(--bg)}
.btn-secondary{background:var(--bg-deep);color:var(--silver-bright);border:1px solid var(--border-strong)}
.btn:hover,.btn:focus-visible,.app-link:hover,.app-link:focus-visible,.drawer-trigger:hover,.drawer-trigger:focus-visible{transform:translateY(-1px);outline:2px solid transparent;box-shadow:0 0 0 2px rgba(232,232,232,.16)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px;box-shadow:var(--shadow)}
.card.subtle{box-shadow:none;background:var(--panel)}
.card-number{font-size:13px;color:var(--silver-bright);font-weight:700;letter-spacing:.08em;margin-bottom:10px}
.card p:last-child{margin-bottom:0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:18px}
.section-head p{max-width:720px;color:var(--muted);margin:0}
.feature-stack{display:grid;gap:14px}
.feature-row{display:grid;grid-template-columns:70px 1fr;gap:18px;padding:18px 0;border-top:1px solid var(--border)}
.feature-row:first-child{border-top:0}
.feature-index{font-size:28px;line-height:1;color:var(--silver-bright);font-weight:800;letter-spacing:.03em}
.shelf{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.shelf-item{min-height:154px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px;display:flex;flex-direction:column;justify-content:space-between}
.shelf-item small{color:var(--muted)}
.timeline{position:relative;margin-left:8px;padding-left:28px}
.timeline::before{content:"";position:absolute;left:5px;top:8px;bottom:8px;width:1px;background:var(--border-strong)}
.timeline-item{position:relative;padding:0 0 24px}
.timeline-item::before{content:"";position:absolute;left:-28px;top:7px;width:11px;height:11px;border-radius:50%;background:var(--silver-bright);box-shadow:0 0 0 4px var(--bg)}
.status{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:var(--panel-2);border:1px solid var(--border);font-size:12px;color:var(--silver)}
.note-list{display:grid;gap:12px}
.note-item{background:var(--panel);border-left:3px solid var(--silver);border-radius:0 12px 12px 0;padding:16px 18px}
.rule-list{margin:0;padding-left:20px}
.rule-list li{margin:7px 0}
.article{max-width:880px}
.article p{margin-bottom:16px}
.article section{margin:28px 0}
.article .callout{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px;margin:20px 0}
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:26px;align-items:start}
.side-card{position:sticky;top:142px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px}
.side-card a{display:block;padding:8px 0;border-bottom:1px solid var(--border);color:var(--silver)}
.side-card a:last-child{border-bottom:0}
.kicker-list{display:grid;gap:12px}
.kicker{display:grid;grid-template-columns:44px 1fr;gap:12px;align-items:start;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px}
.kicker b{width:44px;height:44px;border-radius:10px;background:var(--silver);color:var(--bg);display:flex;align-items:center;justify-content:center}
.faq-list{display:grid;gap:12px}
.faq-item{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px}
.faq-item h2{font-size:16px}
.policy-section{padding:22px 0;border-top:1px solid var(--border)}
.policy-section:first-of-type{border-top:0}

.section-gap-sm{margin-top:18px}
.section-gap{margin-top:20px}
.app-heading-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.compact-heading{margin:0}
.compact-subtitle{margin:2px 0 0;color:var(--muted)}
.app-icon{width:48px;height:48px;object-fit:contain;object-position:center;border-radius:10px}

.notice{background:rgba(184,90,90,.08);border:1px solid rgba(184,90,90,.36);border-radius:12px;padding:16px 18px;color:var(--silver)}
.site-footer{background:var(--bg-deep);border-top:1px solid var(--border);padding:34px 0 calc(34px + env(safe-area-inset-bottom))}
.footer-grid{display:grid;grid-template-columns:220px 1fr;gap:30px}
.footer-brand-link{display:inline-flex;min-height:36px;align-items:center}
.footer-brand-cn{font-weight:800;color:var(--title);margin-top:10px}
.footer-brand-en{font-size:12px;color:var(--muted);letter-spacing:.12em;margin-top:2px}
.footer-links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.footer-links h2{font-size:13px;color:var(--silver-bright);margin-bottom:8px}
.footer-links a{display:block;font-size:13px;color:var(--text);padding:3px 0}
.footer-note{border-top:1px solid var(--border);margin-top:28px;padding-top:18px;font-size:13px;color:var(--muted)}
.footer-note p:last-child{margin-bottom:0}
.site-overlay{position:fixed;inset:0;background:rgba(0,0,0,.66);z-index:180;opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
.site-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}
.drawer-panel{position:fixed;z-index:200;left:0;top:0;bottom:0;width:400px;max-width:86vw;background:var(--bg-deep);border-right:1px solid var(--border-strong);box-shadow:var(--shadow);transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .22s ease,visibility .22s ease;overflow:auto;padding-bottom:24px}
.drawer-panel.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}
.drawer-head{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--border)}
.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title)}
.close-button{min-width:58px;min-height:40px;border:1px solid var(--border-strong);border-radius:9px;background:var(--panel);cursor:pointer}
.drawer-groups{padding:10px 18px 24px}
.drawer-groups section{padding:16px 0;border-bottom:1px solid var(--border)}
.drawer-groups h2{font-size:13px;color:var(--muted);margin-bottom:8px}
.drawer-groups a{display:block;padding:9px 0}
.drawer-groups strong{display:block;color:var(--silver-bright);font-size:14px}
.drawer-groups span{display:block;color:var(--muted);font-size:12px;line-height:1.5;margin-top:2px}
.search-layer{position:fixed;z-index:210;top:82px;left:0;right:0;visibility:hidden;pointer-events:none;opacity:0;transition:.18s ease}
.search-layer.is-open{visibility:visible;pointer-events:auto;opacity:1}
.search-card{width:min(calc(100% - 32px),760px);margin:0 auto;background:var(--ink);border:1px solid var(--border-strong);border-radius:0 0 14px 14px;padding:18px;box-shadow:var(--shadow)}
.search-head{display:flex;align-items:center;justify-content:space-between;gap:18px}
.search-head strong{display:block;color:var(--title)}
.search-head span{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.search-input-wrap{display:block;margin-top:14px}
.search-input-wrap input{width:100%;height:46px;border-radius:10px;border:1px solid var(--border-strong);background:var(--bg);color:var(--title);padding:0 14px;outline:none}
.search-input-wrap input:focus{border-color:var(--silver)}
.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.search-presets a{min-height:40px;padding:0 14px;border:1px solid var(--border);border-radius:9px;display:flex;align-items:center;background:var(--panel);color:var(--silver)}
.search-presets a:hover{border-color:var(--border-strong);color:var(--title)}
.search-empty{margin:12px 0 0;color:var(--muted);font-size:13px}
.mobile-bottom{display:none}
@media (max-width:860px){
    .grid-3,.grid-2,.shelf{grid-template-columns:1fr 1fr}
    .article-grid{grid-template-columns:1fr}
    .side-card{position:static}
    .footer-grid{grid-template-columns:1fr}
}
@media (max-width:680px){
    body{padding-bottom:calc(48px + env(safe-area-inset-bottom))}
    .shell{width:calc(100% - 32px)}
    .case-tabs{display:none}
    .site-main{padding-top:82px}
    .material-bar-inner{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:8px}
    .material-logo{min-width:0;overflow:hidden;white-space:nowrap}
    .drawer-trigger{padding:0 13px}
    .app-link{padding:0 12px}
    .hero-section{padding-top:26px}
    .hero-slot{height:260px}
    .grid-3,.grid-2,.shelf{grid-template-columns:1fr}
    .section-head{display:block}
    .section-head p{margin-top:8px}
    .feature-row{grid-template-columns:54px 1fr;gap:12px}
    .feature-index{font-size:22px}
    .footer-links{grid-template-columns:1fr 1fr}
    .search-layer{top:0;bottom:0;background:var(--bg-deep);overflow:auto}
    .search-card{width:100%;min-height:100%;border:0;border-radius:0;padding:calc(24px + env(safe-area-inset-top)) 16px 80px;background:var(--bg-deep)}
    .mobile-bottom{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;z-index:150;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--bg-deep);border-top:1px solid var(--border)}
    .mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;font-size:12px;color:var(--silver)}
    .mobile-bottom a.is-active{background:var(--silver);color:var(--bg);font-weight:700}
    .site-footer{padding-bottom:34px}
}
@media (max-width:420px){
    .inkline-brand{max-width:72%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .material-logo span{font-size:15px}
    .app-link{font-size:13px}
    h1{font-size:22px}
    .footer-links{grid-template-columns:1fr 1fr}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}