:root{--ink:#10233f;--muted:#6d7a8d;--blue:#1769e0;--blue-dark:#0b3c91;--orange:#ff7b25;--bg:#f5f8fc;--line:#e8edf4;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font-family:Inter,"Microsoft YaHei",Arial,sans-serif}a{text-decoration:none;color:inherit}.shell{max-width:1180px;margin:auto;padding-left:24px;padding-right:24px}.topbar{height:72px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 max(24px,calc((100% - 1180px)/2));gap:32px;position:sticky;top:0;z-index:10}.brand{font-size:21px;font-weight:800;display:flex;align-items:center;gap:9px;white-space:nowrap}.brand-mark{display:grid;place-items:center;background:var(--blue);color:#fff;border-radius:9px;width:34px;height:34px;font-size:18px}.desktop-nav{display:flex;gap:26px;margin-left:18px;font-size:14px;color:#68778e}.desktop-nav a.active,.desktop-nav 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