.portfolio-section {
            padding: 40px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .portfolio-section h1, .portfolio-section p {
            text-align: center;
            color: #333;
        }

        .portfolio-categories {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            margin-top: 40px;
        }

        .portfolio-category {
            flex: 1 1 calc(33.333% - 20px);
            background: #f4f4f4;
            padding: 20px;
            text-align: center;
            border-radius: 10px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .portfolio-category:hover {
            transform: scale(1.05);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        .portfolio-category img {
            width: 60px;
            margin-bottom: 15px;
        }

        .portfolio-category h3 {
            margin: 10px 0;
            color: #333;
        }

        .portfolio-category p {
            color: #555;
            font-size: 0.9rem;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        .expandable-tab {
            max-width: 800px;
            margin: 30px auto;
            padding: 20px;
            background: #f4f4f4;
            border-radius: 10px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .expandable-tab h3 {
            margin-bottom: 15px;
            font-size: 1.5rem;
            color: #333;
        }

        .expandable-tab-content {
            text-align: left;
            margin-top: 10px;
            color: #555;
            line-height: 1.6;
        }

        .expandable-tab ul {
            list-style-type: disc;
            margin-left: 20px;
        }

        .expandable-tab ul li {
            margin-bottom: 10px;
        }