*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:#333;background:#f5f7fa}#app{min-height:100vh}.chat-container{display:flex;flex-direction:column;height:100vh;max-width:1200px;margin:0 auto;background:#fff;box-shadow:0 0 20px rgba(0,0,0,.1)}.chat-header{padding:20px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.1)}.chat-header h1{font-size:24px;font-weight:600;margin:0}.chat-messages{flex:1;overflow-y:auto;padding:20px;background:#f8f9fa}.chat-messages .message{display:flex;margin-bottom:16px;animation:fadeIn .3s ease-in}.chat-messages .message.user{justify-content:flex-end}.chat-messages .message.user .message-content{background:#667eea;color:#fff;border-radius:18px 18px 4px 18px}.chat-messages .message.assistant{justify-content:flex-start}.chat-messages .message.assistant .message-content{background:#fff;color:#333;border-radius:18px 18px 18px 4px;box-shadow:0 2px 8px rgba(0,0,0,.1)}.chat-messages .message .message-content{max-width:70%;padding:12px 16px;word-wrap:break-word;white-space:pre-wrap;line-height:1.5}.chat-messages .message .message-time{font-size:11px;color:#999;margin-top:4px;text-align:right}.chat-messages .typing-indicator{display:flex;justify-content:flex-start;margin-bottom:16px}.chat-messages .typing-indicator .typing-dots{background:#fff;padding:12px 16px;border-radius:18px;box-shadow:0 2px 8px rgba(0,0,0,.1);display:flex;gap:4px}.chat-messages .typing-indicator .typing-dots span{width:8px;height:8px;background:#999;border-radius:50%;animation:typing 1.4s infinite}.chat-messages .typing-indicator .typing-dots span:nth-child(2){animation-delay:.2s}.chat-messages .typing-indicator .typing-dots span:nth-child(3){animation-delay:.4s}.chat-input{padding:20px;background:#fff;border-top:1px solid #e0e0e0;display:flex;gap:12px}.chat-input input{flex:1;padding:12px 16px;border:2px solid #e0e0e0;border-radius:24px;font-size:16px;outline:none;transition:border-color .3s}.chat-input input:focus{border-color:#667eea}.chat-input button{padding:12px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:24px;font-size:16px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.chat-input button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px rgba(102,126,234,.4)}.chat-input button:active:not(:disabled){transform:translateY(0)}.chat-input button:disabled{opacity:.6;cursor:not-allowed}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes typing{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-10px)}}.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;padding:20px;text-align:center}.error-state p{color:#e74c3c;font-size:16px;margin-bottom:20px}.error-state button{padding:12px 24px;background:#667eea;color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer;transition:background .3s}.error-state button:hover{background:#5568d3}.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh}.loading-state p{color:#999;font-size:16px;margin-top:16px}@media(max-width:768px){.chat-container{height:100vh}.chat-header h1{font-size:20px}.chat-messages .message .message-content{max-width:85%}.chat-input{padding:16px}}