*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--user-bubble:#2563eb;--user-text:#fff;--ai-bubble:#1e1e2e;--ai-text:#e4e4e7;--bg-primary:#0f0f17;--bg-secondary:#181825;--bg-input:#1e1e2e;--border-color:#2a2a3c;--text-primary:#e4e4e7;--text-secondary:#71717a;--accent:#2563eb;--accent-hover:#3b82f6;--danger:#ef4444;--danger-hover:#f87171;--success:#22c55e}html,body,#root{background-color:var(--bg-primary);width:100%;height:100%;color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif}#root{width:100%;max-width:860px;margin:0 auto}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.header{border-bottom:1px solid 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