.about_wrapper {
  padding: 20px;
  max-width: 800px;
  margin: 0 auto;
}

/* about セクションの各要素のまとまり */
.about-section {
  margin-bottom: 40px;
  padding: 20px 0;
}

.about-section:last-child {
  margin-bottom: 0;
}

/* セクション間の視覚的な分離 */
.achievements-section,
.tools-section {
  border-top: 1px solid #f0f0f0;
  padding-top: 30px;
}

/* 長文でも折り返し・可視化 */
.text-about {
  word-break: break-word;
  overflow-wrap: anywhere;
  white-space: normal;
  line-height: 1.8;
}

@media screen and (max-width: 600px) {

  .about_wrapper {
    width: 100%;
    position: relative;
    top: auto;
    padding: 20px 20px 80px;
  }

  .text-about {
    font-size: 12px;
  }

  h3 {
    font-size: 15px;
    margin-top: 14px;
  }

  .text-wrapper {
    margin-top: 14px;
  }

  .footer {
    color: #000;
  }

  .natari_icon {
    width: 50%;
    height: 50%;
    margin: 16px auto;
  }

  /* モバイル版のabout-section調整 */
  .about-section {
    margin-bottom: 30px;
    padding: 15px 0;
  }

  .achievements-section,
  .tools-section {
    border-top: 1px solid #f0f0f0;
    padding-top: 20px;
  }
}