:root{--bg:#0e0e10;--panel:#18181b;--border:#2a2a30;--text:#f5f5f5;--muted:#9a9aa3;--user:#2563eb;--assistant:#1f1f24;--accent:#facc15}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;height:100%;overscroll-behavior:none}button{font:inherit;color:inherit;background:var(--accent);color:#18181b;border:none;border-radius:10px;padding:12px 16px;font-weight:600;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}input,textarea{font:inherit;color:inherit;background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:12px;width:100%}