:root{
  --bg:#EEF0F8;--deep-bg:#E0E4F2;--surface:#F7F8FD;--surface-2:#EBEEF8;--title:#1A1840;--text:#2C2A48;--muted:#5A5680;--soft:#7A76A0;--purple:#5B4BDB;--blue:#3A6BD4;--deep:#1C1A3A;--mist:#8AA4E0;--lilac:#8A6AD4;--white:#F7F8FD;--border:rgba(58,107,212,.18);--border-strong:rgba(91,75,219,.42);--shadow:0 12px 28px rgba(28,26,58,.08);--radius:12px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}body.is-locked{overflow:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}.skip-link{position:fixed;left:12px;top:-60px;z-index:100;background:var(--deep);color:var(--white);padding:8px 12px;border-radius:8px}.skip-link:focus{top:8px}.site-top{position:fixed;inset:0 0 auto 0;z-index:50}.address-bar{height:22px;background:var(--deep);color:var(--white);font-size:12px}.address-inner,.window-inner,.section-tabs-inner,.site-main,.footer-inner{width:min(100% - 32px,1000px);margin:0 auto}.address-inner{height:22px;display:flex;align-items:center;justify-content:space-between}.text-button,.drawer-button,.close-button{border:0;background:transparent;color:inherit;cursor:pointer}.text-button{font-size:12px;padding:2px 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img{width:100%;height:100%;object-fit:contain;object-position:center}.slot-168{height:168px}.slot-176{height:176px}.slot-220{height:220px}.slot-280{height:280px}.slot-320{height:320px}.action-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.action-center{justify-content:center}.button-primary,.button-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:10px;font-size:14px;font-weight:800;white-space:nowrap}.button-primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:var(--white)}.button-secondary{background:var(--surface);border:1px solid var(--border-strong);color:var(--deep)}.button-primary:hover,.button-secondary:hover{transform:translateY(-1px)}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(58,107,212,.34);outline-offset:2px}.section-block{padding:22px;margin:18px 0}.long-prose p{max-width:850px}.window-demo{border:1px solid var(--border-strong);border-radius:14px;overflow:hidden;background:var(--surface)}.window-demo-top{height:28px;background:var(--deep-bg);display:flex;align-items:center;gap:6px;padding:0 10px}.dot{width:8px;height:8px;border-radius:50%;background:var(--mist)}.window-demo-body{padding:14px}.stair-stack{display:grid;gap:12px;margin:18px 0}.stair-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow);max-width:760px}.stair-card.offset{margin-left:24px}.tag-wrap{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.tag-wrap span,.tag-wrap a{display:inline-flex;align-items:center;min-height:36px;padding:0 14px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border);color:var(--deep);font-weight:700}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.route-flow{display:flex;align-items:stretch;gap:10px;flex-wrap:wrap}.route-step{flex:1 1 180px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;position:relative}.route-step:not(:last-child)::after{content:"›";position:absolute;right:-9px;top:50%;transform:translateY(-50%);color:var(--purple);font-weight:900;font-size:22px}.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:760px;margin:18px auto}.center-card{background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;padding:20px;text-align:center}.product-card{max-width:760px;margin:18px auto;background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;padding:22px;box-shadow:var(--shadow);text-align:center}.product-icon{display:flex;justify-content:center;margin:0 auto 10px}.product-icon 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a{display:grid;grid-template-columns:92px 1fr;gap:8px;padding:9px 0;border-bottom:1px solid var(--border)}.drawer-group a span{font-weight:800}.drawer-group a small{color:var(--muted);font-size:12px;line-height:1.5}.search-panel{position:fixed;left:0;right:0;top:76px;z-index:85;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-8px);transition:.18s}.search-panel.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:none}.search-card{width:min(720px,calc(100% - 32px));margin:10px auto;background:var(--deep-bg);border:1px solid var(--border-strong);border-radius:14px;box-shadow:0 22px 64px rgba(28,26,58,.20);padding:18px}.search-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.search-card label{display:block;margin-bottom:7px;color:var(--muted)}.search-card input{width:100%;height:44px;border-radius:10px;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);padding:0 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