*,:before,:after{box-sizing:border-box}body{margin:0;padding:0}*{box-sizing:border-box;margin:0;padding:0}body{background:#f0f2f5;justify-content:center;align-items:center;height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;display:flex}.app{justify-content:center;align-items:center;width:100%;height:100vh;padding:20px;display:flex}.chat-container{background:#fff;border-radius:16px;flex-direction:column;width:100%;max-width:780px;height:90vh;max-height:750px;display:flex;overflow:hidden;box-shadow:0 8px 40px #0000001f}.chat-header{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);flex-shrink:0;justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.header-info{align-items:center;gap:12px;display:flex}.status-dot{background:#4ade80;border-radius:50%;width:10px;height:10px;animation:2s infinite pulse;box-shadow:0 0 0 2px #4ade804d}@keyframes pulse{0%,to{box-shadow:0 0 0 2px #4ade804d}50%{box-shadow:0 0 0 5px #4ade801a}}.chat-header h1{color:#fff;letter-spacing:.2px;font-size:16px;font-weight:600}.chat-header p{color:#ffffffbf;margin-top:1px;font-size:12px}.clear-button{color:#fff;cursor:pointer;background:#ffffff26;border:1px solid #ffffff4d;border-radius:8px;padding:6px 12px;font-size:12px;transition:background .2s}.clear-button:hover{background:#ffffff40}.error-banner{color:#dc2626;background:#fef2f2;border-bottom:1px solid #fecaca;flex-shrink:0;padding:10px 20px;font-size:13px}.messages-container{scroll-behavior:smooth;flex:1;padding:20px;overflow-y:auto}.messages-container::-webkit-scrollbar{width:4px}.messages-container::-webkit-scrollbar-track{background:0 0}.messages-container::-webkit-scrollbar-thumb{background:#e2e8f0;border-radius:4px}.empty-state{color:#94a3b8;text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:10px;height:100%;display:flex}.empty-icon{margin-bottom:8px;font-size:48px}.empty-state p{font-size:14px;line-height:1.6}.message-list{flex-direction:column;gap:16px;display:flex}.message{align-items:flex-end;gap:8px;animation:.2s ease-in fadeIn;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message-user{flex-direction:row-reverse}.message-ai{flex-direction:row}.avatar{flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:24px;display:flex}.message-bubble{border-radius:18px;max-width:70%;padding:12px 16px;font-size:14px;line-height:1.5}.message-user .message-bubble{color:#fff;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-bottom-right-radius:4px}.message-ai .message-bubble{color:#1e293b;background:#f1f5f9;border-bottom-left-radius:4px}.message-bubble p{white-space:pre-wrap;word-break:break-word}.typing-indicator{align-items:center;gap:4px;padding:4px 0;display:flex}.typing-indicator span{background:#94a3b8;border-radius:50%;width:7px;height:7px;animation:1.2s infinite bounce}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}.input-container{background:#fff;border-top:1px solid #e2e8f0;flex-shrink:0;padding:16px 20px 12px}.input-area{align-items:flex-end;gap:10px;display:flex}.message-input{resize:none;color:#1e293b;border:1.5px solid #e2e8f0;border-radius:12px;outline:none;flex:1;max-height:120px;padding:10px 14px;font-family:inherit;font-size:14px;line-height:1.5;transition:border-color .2s}.message-input:focus{border-color:#667eea}.message-input:disabled{color:#94a3b8;background:#f8fafc}.send-button{color:#fff;cursor:pointer;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:42px;height:42px;font-size:16px;transition:opacity .2s,transform .1s;display:flex}.send-button:hover:not(:disabled){opacity:.9;transform:scale(1.05)}.send-button:disabled{opacity:.5;cursor:not-allowed}.spinner{border:2px solid #fff6;border-top-color:#fff;border-radius:50%;width:16px;height:16px;animation:.7s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.footer-text{text-align:center;color:#cbd5e1;margin-top:8px;font-size:11px}@media (width<=600px){.app{padding:0}.chat-container{border-radius:0;height:100vh;max-height:100vh}.message-bubble{max-width:85%}}