:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.login-container{display:flex;justify-content:center;align-items:center;height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.login-box{background:#fff;padding:40px;border-radius:12px;box-shadow:0 10px 40px #0003;width:100%;max-width:400px}.login-box h1{margin-bottom:8px;color:#333;text-align:center}.subtitle{text-align:center;color:#666;margin-bottom:30px;font-size:14px}.login-box form{display:flex;flex-direction:column;gap:16px}.login-box input{padding:12px;border:1px solid #ddd;border-radius:6px;font-size:14px}.login-box input:focus{outline:none;border-color:#667eea}.login-box button{padding:12px;background:#667eea;color:#fff;border:none;border-radius:6px;font-size:16px;cursor:pointer;transition:background .2s}.login-box button:hover:not(:disabled){background:#5568d3}.login-box button:disabled{opacity:.6;cursor:not-allowed}.error{color:#e74c3c;font-size:14px;text-align:center}.demo-users{margin-top:20px;padding-top:20px;border-top:1px solid #eee;text-align:center}.demo-users p{font-size:12px;color:#999}.session-list{width:280px;background:#2c2c2c;color:#fff;display:flex;flex-direction:column;border-right:1px solid #444}.session-header{padding:20px;border-bottom:1px solid #444}.session-header h2{margin-bottom:16px;font-size:18px}.new-chat-btn{width:100%;padding:10px;background:#667eea;color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:14px}.new-chat-btn:hover{background:#5568d3}.sessions{flex:1;overflow-y:auto;padding:10px}.session-item{padding:12px;margin-bottom:8px;border-radius:6px;cursor:pointer;transition:background .2s}.session-item:hover{background:#3a3a3a}.session-item.active{background:#667eea}.session-title{font-size:14px;margin-bottom:4px}.session-time{font-size:12px;color:#aaa}.user-info{padding:20px;border-top:1px solid #444;display:flex;justify-content:space-between;align-items:center}.user-name{font-size:14px}.logout-btn{padding:6px 12px;background:transparent;color:#fff;border:1px solid #666;border-radius:4px;cursor:pointer;font-size:12px}.logout-btn:hover{background:#444}.chat-window{flex:1;display:flex;flex-direction:column;background:#fff}.messages{flex:1;overflow-y:auto;padding:20px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:#999}.empty-state h2{margin-bottom:8px}.message{margin-bottom:20px;max-width:80%}.message.user{margin-left:auto}.message.assistant{margin-right:auto}.message-content{padding:12px 16px;border-radius:12px;line-height:1.5}.message.user .message-content{background:#667eea;color:#fff}.message.assistant .message-content{background:#f0f0f0;color:#333}.sources{margin-top:12px;padding:12px;background:#f9f9f9;border-left:3px solid #667eea;border-radius:4px}.sources-title{font-weight:600;margin-bottom:8px;font-size:13px;color:#667eea}.source-item{font-size:13px;color:#666;margin-bottom:4px}.input-form{display:flex;gap:12px;padding:20px;border-top:1px solid #eee}.input-form input{flex:1;padding:12px 16px;border:1px solid #ddd;border-radius:24px;font-size:14px}.input-form input:focus{outline:none;border-color:#667eea}.input-form button{padding:12px 24px;background:#667eea;color:#fff;border:none;border-radius:24px;cursor:pointer;font-size:14px}.input-form button:hover:not(:disabled){background:#5568d3}.input-form button:disabled{opacity:.5;cursor:not-allowed}.chat-container{display:flex;height:100vh;background:#f5f5f5}*{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}.app{height:100vh;width:100vw;overflow:hidden}