.top-wrap {
  position: relative;
  background-image: url(../img/wall.JPG);
  background-position: 20% 20%;
  background-size: cover;
  padding: 150px 0;
  isolation: isolate; /* 念のため。擬似要素の重なりを安定させる */
}
.about-wrap {
  margin: 60px auto;
}
.title {
  width: 100%;
  font-family: "Rajdhani", sans-serif;
  line-height: 1.5;
  display: block;
}
.title h3 {
  font-weight: 600;
  font-style: normal;
  font-size: 32px;
  color: #004fa4;
}
.title p {
  font-size: 18px;
  font-weight: bold;
  border-left: 5px solid #004fa4; /*線の設定*/
  padding: 2px 5px;
  line-height: 0.8;
}
.about-wrap__body {
  margin: 40px auto;
  width: 760px;
}
.about-wrap__body__imgonly {
  width: 100%;
}
.about-wrap__body__imgonly img {
  width: 100%;
}
.about-wrap__body__group {
  display: flex;
  justify-content: space-between;
  margin: 40px auto;
  flex-direction: column;
  align-items: center;
  gap:40px
}
.about-wrap__body__img{
  width: 100%;
}
.about-wrap__body__img:first-child {
  width: 50%;
}
  .about-wrap__body__img img {
    width: 100%;
  }
  .about-wrap__body p {
    font-size: 18px;
    line-height: 1.8;
  }
  .about-wrap__body p span {
    font-weight: bold;
  }
  .feature-wrap__body {
    margin: 40px auto;
    width: 760px;
  }
  .feature-wrap__body__item {
    margin-bottom: 30px;
  }
  .feature-wrap__body__item h4 {
    font-size: 24px;
    color: #004fa4;
    margin-bottom: 5px;
  }
  .feature-wrap__body__item p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 10px;
    font-weight: 400;
  }
  .feature-wrap__body__item iframe {
    width: 80%;
    aspect-ratio: 16 / 9;
    margin: 0 auto;
    display: block;
  }
  .feature-wrap__body__video {
    width: 80%;
    aspect-ratio: 16 / 9;
    margin: 40px auto;
    display: block;
  }
    .feature-wrap__body__video video {
      width:100%
    }
  .feature-wrap__body__item__img {
    width: 80%;
    margin: 0px auto;
  }
  .feature-wrap__body__item__img img {
    width: 100%;
  }
  @media (max-width: 1100px) {
    .about-wrap__body,
    .feature-wrap__body {
      max-width: 85%;
    }
    .gray {
      width: 90%;
    }
    .about-wrap__body p {
      font-size: 16px;
      line-height: 1.8;
    }
  }
  @media (max-width: 767px) {
    .about-wrap__body,
    .feature-wrap__body {
      max-width: 100%;
    }
  }
  @media (max-width: 540px) {
    .top-wrap {
      padding: 60px 0;
    }
    .title h3 {
      font-size: 24px;
    }
    .title p {
      font-size: 12px;
    }
    .feature-wrap__body__item h4 {
      font-size: 16px;
      color: #004fa4;
      margin-bottom: 5px;
    }
    .feature-wrap__body__item p {
      font-size: 14px;
    }
    .about-wrap__body p {
      font-size: 14px;
      line-height: 1.8;
    }
    .top-wrap__title h2 {
      font-size: 20px;
      font-weight: 500;
    }
  }
  /* これを付けた画像だけグレーにする */
  .gray {
    -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
    transition:
      filter 0.5s ease-in-out,
      -webkit-filter 0.5s ease-in-out; /* なめらか */
    will-change: filter;
  }

  /* 100%見えて1秒後にカラー化 */
  .gray.is-color {
    -webkit-filter: grayscale(0%);
    filter: grayscale(0%);
  }
}