/* chatbot.css */
        #ai-chatbot-container {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 9999;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        .chat-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 16px 24px;
            cursor: pointer;
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s ease;
            animation: pulse 2s infinite;
        }

        .chat-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(0,0,0,0.4);
        }

        @keyframes pulse {
            0% { box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
            50% { box-shadow: 0 4px 20px rgba(102, 126, 234, 0.5); }
            100% { box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
        }

        .chat-window {
            position: absolute;
            bottom: 80px;
            right: 0;
            width: 380px;
            height: 500px;
            background: white;
            border-radius: 16px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.2);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            animation: slideUp 0.3s ease-out;
        }

        @keyframes slideUp {
            from { transform: translateY(20px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }

        .hidden {
            display: none !important;
        }

        .chat-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .chat-header h3 {
            margin: 0;
            font-size: 18px;
            font-weight: 600;
        }

        .close-btn {
            background: none;
            border: none;
            color: white;
            font-size: 24px;
            cursor: pointer;
            padding: 0;
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            transition: background-color 0.2s;
        }

        .close-btn:hover {
            background-color: rgba(255,255,255,0.2);
        }

        .product-selection {
            padding: 24px;
            text-align: center;
            flex: 1;
        }

        .product-selection p {
            margin: 0 0 20px 0;
            font-size: 16px;
            color: #333;
        }

        .product-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .product-btn {
            background: white;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            padding: 16px 12px;
            cursor: pointer;
            transition: all 0.2s ease;
            text-align: center;
        }

        .product-btn:hover {
            border-color: #667eea;
            background: #f8faff;
            transform: translateY(-2px);
        }

        .product-icon {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .product-name {
            font-size: 14px;
            font-weight: 600;
            color: #374151;
        }

        .chat-messages {
            flex: 1;
            overflow-y: auto;
            padding: 16px;
            background: #f9fafb;
        }

        .message {
            margin-bottom: 16px;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }

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

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

        .message-content {
            max-width: 80%;
            padding: 12px 16px;
            border-radius: 18px;
            font-size: 14px;
            line-height: 1.4;
        }

        .bot-message .message-content {
            background: white;
            border: 1px solid #e5e7eb;
            border-top-left-radius: 6px;
        }

        .user-message .message-content {
            background: #667eea;
            color: white;
            border-top-right-radius: 6px;
        }

        .chat-input-container {
            padding: 16px;
            border-top: 1px solid #e5e7eb;
            background: white;
        }

        .input-group {
            display: flex;
            gap: 8px;
            margin-bottom: 8px;
        }

        #chat-input {
            flex: 1;
            padding: 12px 16px;
            border: 1px solid #e5e7eb;
            border-radius: 24px;
            font-size: 14px;
            outline: none;
            transition: border-color 0.2s;
        }

        #chat-input:focus {
            border-color: #667eea;
        }

        #send-btn {
            background: #667eea;
            color: white;
            border: none;
            border-radius: 50%;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background-color 0.2s;
        }

        #send-btn:hover {
            background: #5a6fd8;
        }

        #send-btn:disabled {
            background: #9ca3af;
            cursor: not-allowed;
        }

        .back-btn {
            background: none;
            border: none;
            color: #667eea;
            font-size: 14px;
            cursor: pointer;
            padding: 8px 0;
            width: 100%;
            text-align: center;
            transition: color 0.2s;
        }

        .back-btn:hover {
            color: #5a6fd8;
        }

        .typing-indicator {
            display: flex;
            align-items: center;
            gap: 4px;
            padding: 12px 16px;
            background: white;
            border: 1px solid #e5e7eb;
            border-radius: 18px;
            border-top-left-radius: 6px;
            max-width: 80%;
        }

        .typing-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #9ca3af;
            animation: typing 1.4s infinite ease-in-out;
        }

        .typing-dot:nth-child(1) { animation-delay: -0.32s; }
        .typing-dot:nth-child(2) { animation-delay: -0.16s; }

        @keyframes typing {
            0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
            40% { transform: scale(1); opacity: 1; }
        }

        /* Mobile responsive */
        @media (max-width: 480px) {
            .chat-window {
                width: 100vw;
                height: 100vh;
                bottom: 0;
                right: 0;
                border-radius: 0;
                position: fixed;
            }

            .product-buttons {
                grid-template-columns: 1fr;
            }
        }