*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#0f1117;--bg-secondary:#1a1d27;--bg-tertiary:#252830;--bg-input:#1e2029;--text-primary:#e4e6eb;--text-secondary:#9ca3af;--text-muted:#6b7280;--accent:#6366f1;--accent-hover:#818cf8;--accent-subtle:#6366f11f;--user-bubble:#6366f1;--assistant-bubble:#1e2029;--border:#2d3040;--border-focus:#6366f1;--error:#ef4444;--radius:12px;--radius-sm:8px;--shadow:0 2px 8px #0000004d}body{background:var(--bg-primary);color:var(--text-primary);height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;overflow:hidden}#root{flex-direction:column;height:100vh;display:flex}.login-container{background:var(--bg-primary);justify-content:center;align-items:center;height:100vh;display:flex}.login-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;width:400px;max-width:90vw;padding:48px 40px;box-shadow:0 4px 24px #0006}.login-card h1{text-align:center;margin-bottom:8px;font-size:24px;font-weight:600}.login-card .subtitle{color:var(--text-secondary);text-align:center;margin-bottom:32px;font-size:14px}.login-card .form-group{margin-bottom:20px}.login-card label{color:var(--text-secondary);margin-bottom:6px;font-size:13px;font-weight:500;display:block}.login-card input{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);padding:12px 14px;font-family:inherit;font-size:15px;transition:border-color .2s}.login-card input:focus{border-color:var(--border-focus);outline:none}.login-btn{background:var(--accent);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;width:100%;margin-top:8px;padding:12px;font-family:inherit;font-size:15px;font-weight:500;transition:background .2s}.login-btn:hover{background:var(--accent-hover)}.login-btn:disabled{opacity:.6;cursor:not-allowed}.login-error{color:var(--error);text-align:center;margin-top:16px;font-size:13px}.chat-app{flex-direction:column;height:100vh;display:flex}.chat-header{background:var(--bg-secondary);border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.chat-header-left{align-items:center;gap:12px;display:flex}.chat-header-logo{background:var(--accent);border-radius:var(--radius-sm);justify-content:center;align-items:center;width:32px;height:32px;font-size:16px;display:flex}.chat-header h1{font-size:16px;font-weight:600}.model-select{color:var(--text-primary);background:var(--bg-tertiary);border:1px solid var(--border);cursor:pointer;border-radius:8px;padding:6px 12px;font-family:inherit;font-size:13px;transition:border-color .2s}.model-select:focus{border-color:var(--border-focus);outline:none}.model-select option{background:var(--bg-secondary);color:var(--text-primary)}.sign-out-btn{border:1px solid var(--border);color:var(--text-secondary);border-radius:var(--radius-sm);cursor:pointer;background:0 0;padding:8px 16px;font-family:inherit;font-size:13px;transition:all .2s}.sign-out-btn:hover{border-color:var(--text-muted);color:var(--text-primary)}.messages-container{scroll-behavior:smooth;flex:1;padding:24px;overflow-y:auto}.messages-container::-webkit-scrollbar{width:6px}.messages-container::-webkit-scrollbar-track{background:0 0}.messages-container::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.empty-state{height:100%;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.empty-state-icon{background:var(--accent-subtle);border-radius:16px;justify-content:center;align-items:center;width:64px;height:64px;font-size:28px;display:flex}.empty-state h2{color:var(--text-primary);font-size:20px;font-weight:500}.empty-state p{text-align:center;max-width:320px;font-size:14px}.message{gap:12px;max-width:800px;margin-bottom:24px;margin-left:auto;margin-right:auto;display:flex}.message.user{flex-direction:row-reverse}.message-avatar{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;margin-top:2px;font-size:14px;display:flex}.message.user .message-avatar{background:var(--accent);color:#fff}.message.assistant .message-avatar{background:var(--bg-tertiary);color:var(--text-secondary)}.message-bubble{word-wrap:break-word;white-space:pre-wrap;border-radius:16px;max-width:70%;padding:12px 16px;font-size:15px;line-height:1.6}.message.user .message-bubble{background:var(--user-bubble);color:#fff;border-bottom-right-radius:4px}.message.assistant .message-bubble{background:var(--assistant-bubble);border:1px solid var(--border);border-bottom-left-radius:4px}.typing-indicator{gap:4px;padding:4px 0;display:flex}.typing-indicator span{background:var(--text-muted);border-radius:50%;width:8px;height:8px;animation:1.4s infinite typing}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{opacity:.4;transform:translateY(0)}30%{opacity:1;transform:translateY(-6px)}}.input-container{background:var(--bg-secondary);border-top:1px solid var(--border);flex-shrink:0;padding:16px 24px 24px}.input-wrapper{align-items:flex-end;gap:12px;max-width:800px;margin:0 auto;display:flex}.input-wrapper textarea{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);resize:none;flex:1;max-height:160px;padding:14px 16px;font-family:inherit;font-size:15px;line-height:1.5;transition:border-color .2s}.input-wrapper textarea:focus{border-color:var(--border-focus);outline:none}.input-wrapper textarea::placeholder{color:var(--text-muted)}.send-btn{background:var(--accent);border-radius:var(--radius);color:#fff;cursor:pointer;border:none;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;transition:background .2s;display:flex}.send-btn:hover{background:var(--accent-hover)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.send-btn svg{width:20px;height:20px}.error-banner{color:var(--error);border-radius:var(--radius-sm);background:#ef44441a;border:1px solid #ef44444d;max-width:800px;margin:0 auto 12px;padding:10px 16px;font-size:13px}