:root{--ink:#1f2933;--muted:#667085;--line:#e6e8ec;--paper:#fffaf2;--white:#fff;--sun:#ffb020;--coral:#f45b69;--teal:#0e9384;--green:#4f9f5f;--blue:#2f80ed;--shadow:0 18px 45px #1c25311f}*{box-sizing:border-box}body{color:var(--ink);background:#fffdf8;margin:0;font-family:Arial,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.site-header{z-index:20;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#fffdf8f0;position:sticky;top:0}.nav{justify-content:space-between;align-items:center;gap:20px;max-width:1180px;height:72px;margin:0 auto;padding:0 22px;display:flex}.brand{align-items:center;gap:12px;font-weight:800;display:flex}.brand-mark{color:#fff;background:linear-gradient(135deg, var(--coral), var(--sun));border-radius:8px;place-items:center;width:42px;height:42px;display:grid;box-shadow:0 10px 22px 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