main {
  padding-top: 75px;
  color: #fff;
}

main section {
  background-color: #000;
}

main .section_container {
  max-width: 800px;
  padding: 0 15px;
  margin: 0 auto;
}

main h1 {
  font-size: 75px;
}

main h2 {
  font-size: 50px;
}

main p {
  margin-top: 75px;
  font-size: 15px;
  font-family: "Pretendard Variable", Pretendard;
  line-height: 1.3;
}

main section:nth-child(1) {
  background-color: #fff;
  padding: 100px 0 100px;
  box-sizing: border-box;
  color: #222;
}

main section:nth-child(2) {
  background: url('../images/about_section1_background.png') calc(50% - 339px) top no-repeat #000;
  padding-top: 200px;
}

main section:nth-child(2) h2 {
  margin-top: 100px;
}

main section:nth-child(2) .ido_text_box {
  background: url('../images/ido_image.png') right center no-repeat;
  background-size: 370px;
}

main section:nth-child(2) .ido_text_box p {
  max-width: 505px;
}

main .about_main_image {
  display: block;
  width: 100%;
  margin-top: 75px;
}

.overview h2 {
  text-align: right;
}

.overview ul {
  margin-top: 60px;
  max-width: 500px;
  margin-left: auto;
  border-top: 2px solid #fff;
  border-bottom: 2px solid #fff;
  box-sizing: border-box;
}

.overview ul li {
  padding: 32px 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
  font-family: "pretendard variable";
}

.overview ul li:not(:last-child) {
  border-bottom: 1px solid #fff;
}

.overview ul li .title {
  font-weight: bold;
  font-size: 20px;
}

.overview ul li .desc {
  font-size: 15px;
  line-height: 1.6;
  text-align: right;
}

.history .histories {
  margin-top: 60px;
  display: flex;
  flex-direction: column;
  gap: 30px;
  font-family: "pretendard variable";
}

.history .histories h4 {
  font-weight: bold;
  font-size: 40px;
}

.history .histories div {
  padding: 15px 0 15px 30px;
  border-left: 2px solid #fff;
}

.history .histories div p {
  font-size: 20px;
  line-height: 1.3;
  margin-top: 0;
  padding: 5px 0;
}

.philosophy h2 {
  text-align: right;
}

.philosophy .gallery {
  margin-top: 60px;
  margin-left: auto;
  width: 430px;
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
}

.philosophy .gallery .gallery_content {
  width: calc(50% - 15px);
  font-family: "pretendard variable";
  text-align: center;
}

.philosophy .gallery .gallery_content .img_container {
  border-radius: 5px;
  overflow: hidden;
}

.philosophy .gallery .gallery_content img {
  width: 100%;
}

.philosophy .gallery .gallery_content .title {
  margin-top: 30px;
  font-weight: bold;
  font-size: 20px;
}

.philosophy .gallery .gallery_content .desc {
  margin-top: 15px;
  font-size: 15px;
  line-height: 1.3;
  padding: 0 5px;
}


.partnershistory {
  padding-bottom: 150px;
}

.partnershistory .ticker_container {
  display: flex;
  overflow: hidden;
  margin-top: 60px;
  padding: 75px 0;
  border-top: 1px solid #fff;
  border-bottom: 1px solid #fff;
  box-sizing: border-box;
}

.partnershistory .ticker_container .ticker_wrapper {
  display: flex;
  align-items: center;
  animation: ticker-kf 15s linear infinite;
}

.partnershistory .ticker_container img {
  display: block;
  margin-right: 60px;
}

footer {
  background-color: #000;
  color: #fff;
}

footer nav h3 a {
  color: #fff;
}

@media (max-width: 640px) {
  main {
    padding-top: 63px;
  }

  main h1 {
    font-size: 40px;
  }

  main h2 {
    font-size: 28px;
  }

  main p {
    font-size: 12px;
    margin-top: 30px;
  }

  main section:nth-child(1) {
    padding: 60px 0 35px;
  }

  main section:nth-child(2) {
    background-size: 899px auto;
    background-position: calc(30% - 209px) top;
    padding-top: 130px;
  }

  main section:nth-child(2) .ido_text_box {
    background-size: contain;
  }

  main section:nth-child(2) h2 {
    margin-top: 80px;
  }

  .overview ul li {
    padding: 21px 0 19px;
  }

  .overview ul li .title {
    font-size: 16px;
  }
  .overview ul li .desc {
    font-size: 12px;
  }
  .history .histories {
    margin-top: 35px;
  }
  .history .histories h4 {
    font-size: 20px;
  }

  .history .histories div {
    padding: 12px 0 12px 20px;
    border-width: 1px;
  }

  .history .histories div p {
    font-size: 16px;
    padding: 3px 0;
  }

  .philosophy .gallery {
    width: 100%;
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .philosophy .gallery .gallery_content {
    width: 100%;
  }
  .philosophy .gallery .gallery_content .img_container {
    margin: 0 auto;
    max-width: 200px;
  }
  .philosophy .gallery .gallery_content .title {
    margin-top: 20px;
    font-size: 16px;
  }
  .philosophy .gallery .gallery_content .desc {
    font-size: 12px;
  }
  .partnershistory {
    padding-bottom: 100px;
  }
  .partnershistory .ticker_container {
    margin-top: 35px;
    padding: 33px 0;
  }
  .partnershistory .ticker_container img {
    margin-right: 33px;
  }
}