body {
        font-family: 'Inter', sans-serif;
        background-color: #f7f9fc;
        margin: 0;
        padding: 0;
      }

      .portfolio-section {
        padding: 80px 20px;
        max-width: 1200px;
        margin: 0 auto;
      }

      .filter-menu {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 12px;
        margin-bottom: 50px;
      }

      .filter-menu a {
        text-decoration: none;
        padding: 10px 22px;
        border-radius: 30px;
        background: #e4e6eb;
        color: #333;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.3s ease;
        user-select: none;
        display: inline-flex;
        align-items: center;
        justify-content: center;
      }

      .filter-menu a.active,
      .filter-menu a:hover {
        background: crimson;
        color: white;
        box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
      }

      .portfolio-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 30px;
      }

      .portfolio-card {
        background: white;
        border-radius: 16px;
        box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
        overflow: hidden;
        transition: transform 0.3s, box-shadow 0.3s;
        display: block;
        /* default visible */
      }

      .portfolio-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
      }

      .portfolio-image {
        height: 180px;
        background-color: #f1f3f5;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 20px;
      }

      .portfolio-image img {
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
      }

      .portfolio-info {
        padding: 20px;
        text-align: center;
      }

      .portfolio-title {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 6px;
        color: #222;
      }

      .portfolio-subtitle {
        font-size: 14px;
        color: #666;
      }

      @media (max-width: 480px) {
        .filter-menu {
          gap: 8px;
        }

        .filter-menu a {
          padding: 8px 14px;
          font-size: 14px;
        }
      }