.mv-background {
  background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.3)), /* ✅ 半透明の黒で暗くする */ url("../img/top_company3-jpg.webp");
  background-position: center;
  background-size: COVER;
  background-repeat: no-repeat;
  align-items: center; /* ✅ 横中央 */
  display: flex; /* ✅ Flexboxを有効に */
  flex-direction: column; /* ✅ h2とpを縦並びに */
  justify-content: center; /* ✅ 縦中央 */
  text-align: center; /* ✅ テキスト中央揃え */
}
.section-mv h2 {
  color: #FFF;
  font-size: 6rem;
  font-style: normal;
  font-weight: 900;
  line-height: normal;
  text-align: center;
}
@media screen and (max-width: 680px) {
  .section-mv h2 {
    font-size: 3.2rem;
  }
}
.section-mv p {
  color: #FFF;
  text-align: center;
  font-size: 1.6rem;
  font-style: normal;
  font-weight: 700;
  line-height: 40px;
}
.section-overview {
  background: #fff;
  padding: 80px 0px;
}
.overview-title, .timeline-title {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 25px 40px ;
}
.overview-title h2, .timeline-title h2 {
  font-size: 4rem;
}
.overview-title p, .timeline-title p {
  font-size: 1.6rem;
  color: #E70012;
  font-weight: bold;
}
.overview-table{
    padding: 0 25px;
}
.overview-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1.6rem;
  max-width: 1140px;
  margin: 0 auto;

}
.overview-table th {
  width: 30%;
  background: #B60000;
  color: #fff;
  text-align: left;
  vertical-align: top;
  padding: 15px;
  border-bottom: 1px solid;
  font-size: 1.6rem;

}

iframe {
  padding: 20px 0px 20px;
}
.overview-table td {
  border: 1px solid #B60000;
  padding: 15px;
  vertical-align: top;
  font-size: 1.6rem
}
.overview-table img {
  width: 100%;
  max-width: 500px;
  margin-top: 15px;
}
@media screen and (max-width: 980px){
  .section-overview {
    padding: 60px 0px;
  }}

@media screen and (max-width: 680px) {
  .overview-title h2, .timeline-title h2 {
  font-size: 3.6rem;
}
  
  .overview-title p {
    font-size: 1.4rem;
  }
  .overview-table th, .overview-table td {
    display: block;
    width: 100%;
  }
  .overview-table th {
    border-bottom: none;
  }
  .overview-table tr {
    display: block;
  }
}
.timeline {
  position: relative;
  text-align: center; /* ✅ テキスト中央揃え */
  padding: 0 25px 150px;
}
.timeline-img {
  background: url("../img/history-img.png");
  padding: 115px 0px;
  background-position: center;
  background-size: COVER;
  background-repeat: no-repeat;
  align-items: center; /* ✅ 横中央 */
  display: flex; /* ✅ Flexboxを有効に */
  flex-direction: column; /* ✅ h2とpを縦並びに */
  justify-content: center; /* ✅ 縦中央 */
  max-width: 1140px;
  width: 100%;
  margin: 0 auto;
}
.timeline-wh {
  width: 80%;
  background: rgba(255, 255, 255, 0.70);
  padding: 65px 25px;
}
.timeline-list li {
  position: relative;
  margin-bottom: 60px;
  width: 75%;
  margin: 0 auto;
  padding-bottom: 40px;
  list-style: none;
  border-left: 2px solid #E70012;
}
.timeline-list :last-child {
  border-left: none;
  padding-bottom: 0px;
}
.timeline-list .dot {
  position: absolute;
  left: -7px; /* ✅ 線の上に重なるように調整 */
  width: 12px;
  height: 12px;
  background: #E70012;
  border-radius: 50%;
}
.timeline-content {
  text-align: left;
}
.year {
  line-height: 1rem;
  font-size: 2rem;
  font-weight: bold;
  color: #E70012;
  position: relative;
}
.year, .event {
  padding-left: 30px;
}
.timeline-content .event {
  padding-top: 10px;
}
@media screen and (max-width: 650px) {
  .timeline-img {
    padding: 60px 0px;
  }
  .timeline-wh {
    width: 93%;
    padding: 50px 15px;
  }
  .timeline {

  padding: 0 0px 150px;
}
  .timeline-list li {
    width: 100%;
  }
  .year, .event {
    padding-left: 20px;
  }
}