:root{--ink:#182338;--muted:#667085;--line:#e6eaf0;--blue:#2766f0;--blue2:#6b8cff;--soft:#f5f8ff;--orange:#ff7c46;--radius:24px;--shadow:0 18px 55px rgba(28,54,95,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;background:#fff;line-height:1.65}a{color:inherit;text-decoration:none}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1180px)/2));position:sticky;top:0;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);z-index:20;border-bottom:1px solid rgba(230,234,240,.85)}.brand{display:flex;align-items:center;gap:11px}.brand>span{display:grid;place-items:center;width:38px;height:38px;background:linear-gradient(145deg,var(--blue),var(--blue2));color:#fff;border-radius:12px;font-weight:800}.brand strong{font-size:18px}.topbar 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