*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f1117;--surface:#161b27;--border:#2a2f3e;--text:#e5e7eb;--muted:#6b7280;--blue:#3b82f6;--blue-light:#60a5fa;--green:#34d399;--font:system-ui,-apple-system,sans-serif}body{background:var(--bg);color:var(--text);font-family:var(--font);font-size:14px;height:100vh;display:flex;flex-direction:column}#root{flex:1;display:flex;flex-direction:column}.app{flex:1;display:flex;flex-direction:column;max-width:800px;width:100%;margin:0 auto;padding:0 20px}header{padding:20px 0 16px;border-bottom:1px solid var(--border);margin-bottom:20px}header h1{font-size:20px;font-weight:700}header p{color:var(--muted);font-size:13px;margin-top:4px}.messages{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding-bottom:20px}.msg{padding:12px 16px;border-radius:8px;line-height:1.6;max-width:85%}.msg.user{background:var(--blue);align-self:flex-end}.msg.assistant{background:var(--surface);border:1px solid var(--border);align-self:flex-start}.msg.system{background:none;color:var(--muted);font-size:12px;align-self:center;text-align:center}.input-row{display:flex;gap:8px;padding:16px 0;border-top:1px solid var(--border)}.input-row textarea{flex:1;background:var(--surface);border:1px solid var(--border);border-radius:6px;color:var(--text);padding:10px 12px;font-size:14px;font-family:var(--font);resize:none;min-height:44px;max-height:120px}.input-row textarea:focus{outline:none;border-color:var(--blue)}.input-row button{padding:10px 16px;background:var(--blue);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:14px;white-space:nowrap}.input-row button:disabled{opacity:.5;cursor:not-allowed}.actions{display:flex;gap:8px;padding:0 0 16px}.actions button{padding:8px 16px;border-radius:6px;font-size:13px;cursor:pointer}.btn-download{background:var(--green);color:#000;border:none}.btn-reset{background:none;border:1px solid var(--border);color:var(--muted)}.loading{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--muted);animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:.3}50%{opacity:1}}