body {
      font-family: "Arial", sans-serif;
      background-color: #f8f8f8;
      padding: 1em;
      max-width: 1200px;
      margin: auto;
    }
h2 {
    position: relative;
    padding: 1rem;
    border-radius: 15px;
    border: 1px solid;
    border-bottom: 8px solid #0075c1;
    background-color: #ebefef;
    color: #333;
    font-weight: bold;
      font-size: 1.4em;
    text-align: center;
}

h2:before {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    height: 25px;
    width: 1px;
    background-color: #0075c1;
    content: "";
}

    .card-grid {
      display: grid;
      /*grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));*/
      gap: 1em;
      margin-top: 1em;
    }
.card-grid {
  display: grid;
  gap: 1em;
  margin-top: 1em;
  grid-template-columns: repeat(2, 1fr); /* デフォルトはスマホ：2列 */
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr); /* PC：4列 */
  }
}
    .card {
      background-color: white;
      border-radius: 10px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
      text-align: center;
      text-decoration: none;
      color: inherit;
      position: relative;
      overflow: hidden;
      padding-bottom: 1em;
    }
    .card.locked {
      color: #aaa;
      pointer-events: none;
      background-color: #f0f0f0;
    }
    .card img {
      width: 100%;
      height: auto;
      border-radius: 10px 10px 0 0;
      transition: filter 0.3s;
    }
    .card.locked img {
      filter: grayscale(100%);
    }
    .card-title {
      font-weight: bold;
      font-size: 1em;
      margin-top: 0.5em;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.4em;
      padding: 0 0.5em;
      text-align: center;
    }
    .card-subtitle {
      font-size: 0.85em;
      color: #555;
      padding: 0 0.5em;
    }
    .card-title .material-symbols-outlined {
      font-size: 1.2em;
      flex-shrink: 0;
    }
    .ict-section .card {
      border: 2px solid #0097d3;
      background-color: #e9f6fc;
    }
    .scratch-section .card {
      border: 2px solid #ff9800;
      background-color: #fff3e0;
    }
.intro-box {
  background-color: #fff8dc; /* 薄い黄色 */
  border: 2px solid #f6a13c; /* オレンジ色の枠線（全体） */
  padding: 1em 1.2em;
  border-radius: 12px; /* 丸み */
  margin-bottom: 1.5em;
  font-size: 1em;
  line-height: 1.6;
}

    /*ひとことICTカード用ここから*/
    .card-section.sc {
      border: 2px solid #8e24aa;
      background-color: #f3e5f5;
    }
    .card-section.ict {
      border: 2px solid #0097d3;
      background-color: #e1f5fe;
    }
    .card-section.sns {
      border: 2px solid #00acc1;
      background-color: #e0f7fa;
    }
    .card-section.dm {
      border: 2px solid #43a047;
      background-color: #e8f5e9;
    }
.material-symbols-outlined.viewed {
  color: #2e7d32; /* 緑っぽく */
}
    /*ひとことICTカード用ここまで*/