:root{--primary-color: #0084ff;--user-bubble-bg: #0084ff;--assistant-bubble-bg: #e4e6eb;--user-text-color: #ffffff;--assistant-text-color: #050505;--bg-color: #f0f2f5;--input-bg: #ffffff;--border-color: #d0d0d0;--header-bg: #ffffff;--shadow: 0 2px 8px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-color)}.app{width:100%;height:100vh;display:flex;justify-content:center;align-items:center;padding:0}.chat-container{width:100%;height:100vh;max-width:100%;display:flex;flex-direction:column;background-color:var(--bg-color);overflow:hidden}.chat-header{background-color:var(--header-bg);padding:1rem;text-align:center;border-bottom:1px solid var(--border-color);box-shadow:var(--shadow);z-index:10}.chat-header h1{font-size:1.5rem;color:#333;margin-bottom:.25rem}.chat-header .subtitle{font-size:.875rem;color:#666}.messages-container{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.75rem}.empty-state{display:flex;justify-content:center;align-items:center;height:100%;color:#999;font-size:1rem;text-align:center;padding:2rem}.message-wrapper{display:flex;width:100%;margin-bottom:.5rem}.message-user{justify-content:flex-end}.message-assistant{justify-content:flex-start}.message-bubble{max-width:70%;padding:.75rem 1rem;border-radius:1.25rem;word-wrap:break-word;box-shadow:0 1px 2px #0000001a}.user-bubble{background-color:var(--user-bubble-bg);color:var(--user-text-color);border-bottom-right-radius:.25rem}.assistant-bubble{background-color:var(--assistant-bubble-bg);color:var(--assistant-text-color);border-bottom-left-radius:.25rem}.message-text{margin:0;line-height:1.4;font-size:.95rem}.message-time{display:block;font-size:.7rem;margin-top:.25rem;opacity:.7}.loading-indicator{display:flex;justify-content:flex-start;padding:.5rem 1rem}.typing-dots{display:flex;align-items:center;gap:.3rem;background-color:var(--assistant-bubble-bg);padding:.75rem 1rem;border-radius:1.25rem 1.25rem 1.25rem .25rem}.typing-dots span{width:8px;height:8px;background-color:#666;border-radius:50%;animation:typing 1.4s infinite ease-in-out}.typing-dots span:nth-child(1){animation-delay:0s}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{opacity:.3;transform:scale(.8)}30%{opacity:1;transform:scale(1)}}.input-wrapper{background-color:var(--input-bg);border-top:1px solid var(--border-color);padding:1rem;box-shadow:0 -2px 8px #0000000d}.chat-input-form{width:100%}.input-container{display:flex;gap:.5rem;align-items:flex-end}.chat-textarea{flex:1;padding:.75rem;border:1px solid var(--border-color);border-radius:1.25rem;font-size:1rem;font-family:inherit;resize:none;outline:none;min-height:44px;max-height:120px;transition:border-color .2s}.chat-textarea:focus{border-color:var(--primary-color)}.chat-textarea:disabled{background-color:#f5f5f5;cursor:not-allowed}.send-button{padding:.75rem 1.5rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:1.25rem;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .2s,opacity .2s;min-width:70px;height:44px}.send-button:hover:not(:disabled){background-color:#0073e6}.send-button:disabled{background-color:#ccc;cursor:not-allowed;opacity:.6}@media (min-width: 768px){.chat-container{max-width:768px;height:90vh;border-radius:12px;box-shadow:0 4px 20px #00000026}.chat-header{border-radius:12px 12px 0 0}.message-bubble{max-width:60%}}@media (min-width: 1024px){.chat-container{max-width:900px}.message-bubble{max-width:50%}.chat-header h1{font-size:1.75rem}}