:root{--bg:#ffffff;--bg-secondary:#f7f7f8;--bg-tertiary:#efefef;--bg-hover:#e8e8ec;--accent:#0d9373;--accent-dim:rgba(13,147,115,0.06);--accent-hover:#0ba882;--text:#1a1a1a;--text-muted:#6b6b80;--text-dim:#9b9bab;--border:#e0e0e6;--user-bubble:#0d9373;--user-text:#ffffff;--assistant-bg:#f7f7f8;--radius:14px;--radius-sm:10px;--max-chat:720px;--header-h:52px}*,:after,:before{box-sizing:border-box}body,html{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.container{margin:0 auto;max-width:1120px;padding:0 1rem}.askgo-clone{position:relative;height:100dvh;background:var(--bg);color:var(--text);display:flex;flex-direction:column;overflow:hidden}.header{position:fixed;top:0;left:0;right:0;height:var(--header-h);padding:0 12px 0 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