:root{--navy:#29314e;--navy-2:#363e5d;--coral:#ff5966;--coral-dark:#e94656;--blue:#36a9e8;--purple:#8666e8;--paper:#f3f5fa;--ink:#242b3c;--muted:#7d8493;--line:#e4e8f0;--white:#fff;--shadow:0 12px 30px rgba(31,43,72,.10)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.5 "Microsoft YaHei",system-ui,sans-serif}.topbar{height:66px;background:var(--navy);display:flex;align-items:center;justify-content:space-between;padding:0 max(5vw,28px);position:sticky;top:0;z-index:10;box-shadow:0 2px 10px #10172730}.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;font-size:17px}.brand small{display:inline-block;margin-left:7px;padding:2px 6px;border-radius:3px;background:#edb55a;color:#fff;font-size:11px;font-weight:700;vertical-align:2px}.brand-mark{display:grid;place-items:center;width:30px;height:30px;border:2px solid 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