:root{--bg:#f6f8fc;--surface:#fff;--text:#162033;--muted:#667085;--line:#dfe5ef;--accent:#4856d8;--accent-dark:#3441b5;--green:#18835d;--red:#c33b4b;--shadow:0 14px 40px rgba(38,55,91,.08);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--bg)}button,input,textarea,select{font:inherit}button{cursor:pointer}.topbar{height:58px;padding:0 22px;display:flex;align-items:center;gap:14px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.brand{display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;color:var(--text);font-size:18px;font-weight:800;text-decoration:none}.brand img{width:30px;height:30px;border-radius:8px;object-fit:cover}.site-nav{display:flex;align-items:center;gap:2px;min-width:0;flex:1;overflow-x:auto;scrollbar-width:none}.site-nav::-webkit-scrollbar{display:none}.site-nav a{flex:0 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