* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
        }

        .app-container {
            width: 95%;
            max-width: 1400px;
            height: 90vh;
            display: flex;
            gap: 20px;
        }

        .sidebar {
            width: 280px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 25px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            backdrop-filter: blur(10px);
            border: 3px solid rgba(255, 255, 255, 0.3);
        }

        .sidebar-header {
            padding: 20px;
            background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
            border-bottom: 2px solid rgba(0, 0, 0, 0.05);
        }

        .new-chat-button {
            width: 100%;
            padding: 15px;
            background: rgba(255, 255, 255, 0.9);
            border: none;
            border-radius: 15px;
            font-size: 16px;
            font-weight: 600;
            color: #667eea;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        }

        .new-chat-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
            background: white;
        }

        .new-chat-button:active {
            transform: translateY(0);
        }

        .chats-list {
            flex: 1;
            overflow-y: auto;
            padding: 15px;
        }

        .chats-list::-webkit-scrollbar {
            width: 6px;
        }

        .chats-list::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }

        .chats-list::-webkit-scrollbar-thumb {
            background: #ff9a9e;
            border-radius: 10px;
        }

        .chat-item {
            padding: 15px;
            margin-bottom: 10px;
            background: #f8f9fa;
            border-radius: 15px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border: 2px solid transparent;
            position: relative;
        }

        .chat-item:hover {
            background: #e9ecef;
            transform: translateX(5px);
        }

        .chat-item.active {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-color: rgba(255, 255, 255, 0.3);
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .chat-item-content {
            flex: 1;
            min-width: 0;
        }

        .chat-item-title {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .chat-item-preview {
            font-size: 12px;
            color: #666;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .chat-item.active .chat-item-preview {
            color: rgba(255, 255, 255, 0.8);
        }

        .delete-chat-btn {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            border: none;
            background: rgba(255, 99, 99, 0.2);
            color: #ff6363;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            opacity: 0;
            transition: all 0.3s ease;
            flex-shrink: 0;
            margin-left: 10px;
        }

        .chat-item:hover .delete-chat-btn {
            opacity: 1;
        }

        .delete-chat-btn:hover {
            background: rgba(255, 99, 99, 0.3);
            transform: scale(1.1);
        }

        .chat-item.active .delete-chat-btn {
            background: rgba(255, 255, 255, 0.2);
            color: white;
        }

        .empty-chats {
            text-align: center;
            padding: 40px 20px;
            color: #999;
        }

        .empty-chats p {
            font-size: 14px;
            margin-top: 10px;
        }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(5px);
        }

        .modal.show {
            display: flex;
        }

        .modal-content {
            background: white;
            padding: 30px;
            border-radius: 20px;
            max-width: 500px;
            width: 90%;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            animation: slideIn 0.3s ease-out;
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .modal-header h2 {
            margin: 0;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .close-button {
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: #999;
            transition: color 0.3s ease;
        }

        .close-button:hover {
            color: #333;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
        }

        .form-group input {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 14px;
            transition: border-color 0.3s ease;
        }

        .form-group input:focus {
            outline: none;
            border-color: #667eea;
        }

        .form-group small {
            display: block;
            margin-top: 5px;
            color: #666;
            font-size: 12px;
        }

        .modal-buttons {
            display: flex;
            gap: 10px;
            justify-content: flex-end;
        }

        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .btn-secondary {
            background: #f0f0f0;
            color: #333;
        }

        .btn-secondary:hover {
            background: #e0e0e0;
        }

        .chat-container {
            flex: 1;
            height: 100%;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 30px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            backdrop-filter: blur(10px);
            border: 3px solid rgba(255, 255, 255, 0.3);
        }

        .chat-header {
            background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 50%, #fecfef 100%);
            padding: 20px 30px;
            border-radius: 30px 30px 0 0;
            display: flex;
            align-items: center;
            gap: 15px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        .avatar {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }

        .header-text {
            flex: 1;
        }

        .header-text h1 {
            color: #fff;
            font-size: 24px;
            font-weight: 600;
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }

        .header-text p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 14px;
            margin-top: 2px;
        }

        .settings-button {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: none;
            background: rgba(255, 255, 255, 0.3);
            color: white;
            cursor: pointer;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            margin-right: 10px;
        }

        .settings-button:hover {
            background: rgba(255, 255, 255, 0.4);
            transform: rotate(90deg);
        }

        .status-indicator {
            width: 12px;
            height: 12px;
            background: #4ade80;
            border-radius: 50%;
            animation: pulse 2s infinite;
            box-shadow: 0 0 10px #4ade80;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        .chat-messages {
            flex: 1;
            padding: 25px;
            overflow-y: auto;
            background: linear-gradient(to bottom, #f8f9fa, #ffffff);
        }

        .chat-messages::-webkit-scrollbar {
            width: 8px;
        }

        .chat-messages::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }

        .chat-messages::-webkit-scrollbar-thumb {
            background: #ff9a9e;
            border-radius: 10px;
        }

        .message {
            margin-bottom: 20px;
            display: flex;
            animation: slideIn 0.3s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message.user {
            justify-content: flex-end;
        }

        .message.assistant {
            justify-content: flex-start;
        }

        .message-content {
            max-width: 70%;
            padding: 15px 20px;
            border-radius: 20px;
            position: relative;
            word-wrap: break-word;
            line-height: 1.5;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        .message.user .message-content {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-bottom-right-radius: 5px;
        }

        .message.assistant .message-content {
            background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
            color: #333;
            border-bottom-left-radius: 5px;
        }

        .message-icon {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            margin: 0 10px;
            flex-shrink: 0;
        }

        .message.user .message-icon {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            order: 2;
        }

        .message.assistant .message-icon {
            background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
            order: 0;
        }

        .chat-input-container {
            padding: 20px 25px;
            background: rgba(255, 255, 255, 0.9);
            border-top: 2px solid rgba(0, 0, 0, 0.05);
        }

        .input-wrapper {
            display: flex;
            gap: 12px;
            align-items: center;
            background: #f8f9fa;
            border-radius: 25px;
            padding: 5px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            border: 2px solid transparent;
            transition: all 0.3s ease;
        }

        .input-wrapper:focus-within {
            border-color: #ff9a9e;
            box-shadow: 0 4px 20px rgba(255, 154, 158, 0.3);
        }

        .chat-input {
            flex: 1;
            border: none;
            outline: none;
            padding: 15px 20px;
            font-size: 16px;
            background: transparent;
            color: #333;
        }

        .chat-input::placeholder {
            color: #999;
        }

        .send-button {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            border: none;
            background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
            color: white;
            cursor: pointer;
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            box-shadow: 0 4px 10px rgba(255, 154, 158, 0.3);
        }

        .send-button:hover {
            transform: scale(1.1) rotate(15deg);
            box-shadow: 0 6px 20px rgba(255, 154, 158, 0.5);
        }

        .send-button:active {
            transform: scale(0.95);
        }

        .typing-indicator {
            display: none;
            padding: 15px 20px;
            background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
            border-radius: 20px;
            border-bottom-left-radius: 5px;
            max-width: 70px;
            margin-bottom: 20px;
        }

        .typing-indicator.active {
            display: flex;
            gap: 5px;
        }

        .typing-dot {
            width: 8px;
            height: 8px;
            background: #333;
            border-radius: 50%;
            animation: typing 1.4s infinite;
        }

        .typing-dot:nth-child(2) {
            animation-delay: 0.2s;
        }

        .typing-dot:nth-child(3) {
            animation-delay: 0.4s;
        }

        @keyframes typing {
            0%, 60%, 100% { transform: translateY(0); }
            30% { transform: translateY(-10px); }
        }

        .welcome-message {
            text-align: center;
            padding: 40px 20px;
            color: #666;
        }

        .welcome-message h2 {
            font-size: 28px;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .welcome-message p {
            font-size: 16px;
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .app-container {
                width: 100%;
                height: 100vh;
                gap: 0;
            }

            .sidebar {
                width: 100%;
                border-radius: 0;
                display: none;
            }

            .sidebar.show {
                display: flex;
            }

            .chat-container {
                width: 100%;
                height: 100vh;
                border-radius: 0;
            }

            .message-content {
                max-width: 85%;
            }

            .header-text h1 {
                font-size: 20px;
            }
        }