:root{--bg:#fff;--bg-soft:#f7f8fa;--bg-sidebar:#f9fafb;--border:#e8eaed;--text:#1f2328;--text-dim:#6b7280;--text-faint:#9aa1ac;--brand:#2f6bff;--brand-soft:#eef3ff;--bubble-user:#eef3ff;--danger:#e5484d;--radius:14px;--shadow:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.06)}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.65}button{cursor:pointer;border:none;background:none}button,input,textarea{font-family:inherit;font-size:inherit;color:inherit}a{color:var(--brand)}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-thumb{background:#d5d9e0;border:3px solid 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