*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh}.app{max-width:1200px;margin:0 auto;padding:20px;min-height:100vh;display:flex;flex-direction:column}.header{text-align:center;color:#fff;margin-bottom:20px}.header h1{font-size:2.5rem;margin-bottom:10px}.agent-selector{display:flex;gap:10px;justify-content:center;margin-bottom:20px}.agent-btn{padding:12px 24px;border:2px solid white;background:transparent;color:#fff;font-size:1rem;font-weight:600;border-radius:25px;cursor:pointer;transition:all .3s}.agent-btn:hover{background:#ffffff1a}.agent-btn.active{background:#fff;color:#667eea}.chat-container{flex:1;background:#fff;border-radius:20px;box-shadow:0 20px 60px #0000004d;display:flex;flex-direction:column;overflow:hidden}.messages{flex:1;padding:20px;overflow-y:auto;max-height:calc(100vh - 350px)}.empty-state{text-align:center;color:#999;padding:60px 20px}.message{margin-bottom:20px;padding:15px;border-radius:12px;max-width:80%;animation:fadeIn .3s}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.user{background:#667eea;color:#fff;margin-left:auto}.message.assistant{background:#f0f0f0;color:#333}.message.error{background:#fee;color:#c00}.message-header{display:flex;justify-content:space-between;margin-bottom:8px;font-size:.9rem}.message-content{line-height:1.6;white-space:pre-wrap}.typing-indicator{display:flex;gap:5px}.typing-indicator span{width:8px;height:8px;background:#999;border-radius:50%;animation:bounce 1.4s infinite}.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(-10px)}}.input-container{border-top:1px solid #eee;padding:20px}.clear-btn{padding:8px 16px;margin-bottom:10px;border:1px solid #ddd;background:#fff;border-radius:8px;cursor:pointer}.input-wrapper{display:flex;gap:10px}.input-wrapper textarea{flex:1;padding:12px;border:2px solid #ddd;border-radius:12px;font-size:1rem;font-family:inherit;resize:none}.input-wrapper textarea:focus{outline:none;border-color:#667eea}.send-btn{padding:12px 24px;background:#667eea;color:#fff;border:none;border-radius:12px;font-size:1.2rem;cursor:pointer}.send-btn:hover:not(:disabled){background:#5568d3}.send-btn:disabled{background:#ccc;cursor:not-allowed}