:root{--bg:#EEF5FB;--deep:#E3EEF7;--surface:#fff;--soft:#D7E8F4;--ink:#10263A;--text:#243848;--muted:#5A7388;--aux:#7E93A6;--blue:#3B9FE0;--bright:#62B7EE;--steel:#1E6FB8;--ice:#A9D6F2;--mint:#2FA8A0;--border:rgba(30,111,184,.16);--strong:rgba(59,159,224,.38);--shadow:0 16px 40px rgba(16,38,58,.08);--max:1220px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}.wrap{width:min(calc(100% - 32px),var(--max));margin:auto}a{color:inherit;text-decoration:none}button{font:inherit}.site-header{position:fixed;left:0;right:0;top:0;z-index:60}.brand-strip{height:18px;background:var(--steel);color:#fff;font-size:12px}.strip-inner{height:18px;display:flex;align-items:center;justify-content:space-between}.text-button{border:0;background:transparent;color:#fff;padding:0 4px;cursor:pointer}.window-bar{height:62px;background:#fff;border-bottom:1px solid var(--border)}.window-inner{height:62px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}.brand-link{justify-self:start;display:flex;align-items:center;min-height:44px;color:var(--ink)}.brand-link img,.footer-brand img,.book-brand img{max-height:36px;max-width:190px;object-fit:contain}.book-button,.app-link,.close-button{min-height:44px;border-radius:10px;border:1px solid var(--strong);background:#fff;color:var(--steel);padding:0 18px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.app-link{justify-self:end}.book-button:hover,.app-link:hover,.close-button:hover,.preset-links a:hover{border-color:var(--steel);box-shadow:0 0 0 3px rgba(59,159,224,.12)}.tab-track{height:40px;background:var(--deep);border-bottom:1px solid var(--border)}.tab-inner{height:40px;display:flex;align-items:stretch;gap:6px}.tab-inner a{display:flex;align-items:center;padding:0 16px;color:var(--ink)}.tab-inner a.active{background:var(--blue);color:#fff}.main-content{padding-top:120px;min-height:60vh}.hero,.section{padding:36px 0}.hero-visual,.media-slot{background:linear-gradient(145deg,#fff,var(--deep));border:1px solid 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h2{margin:0;color:var(--ink);font-size:26px}.section-title p{margin:0;color:var(--muted);max-width:720px}.feature-split{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:24px;align-items:center}.indexed-list{display:grid;gap:12px}.indexed-item{display:grid;grid-template-columns:64px 1fr;gap:14px;padding:18px;background:#fff;border:1px solid var(--border);border-radius:12px}.indexed-item .num,.number-card .num{font-size:30px;font-weight:800;color:var(--steel);line-height:1}.rack-list{display:grid;gap:12px}.rack-row{display:grid;grid-template-columns:160px 1fr auto;gap:16px;align-items:center;background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px}.rack-row strong{color:var(--ink)}.rack-row a{color:var(--steel);font-weight:700}.page-head{padding:34px 0 18px}.prose{background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:28px}.prose h2{color:var(--ink);margin-top:28px}.prose 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