.contents_inner {
  max-width: 1100px;
  margin: 0px auto;
}

section {
  overflow: hidden;
}

.aniversary_fv {
  width: 100vw;
  height: auto;
  padding: 20px 5vw 0;
}
@media screen and (min-width: 768px) {
  .aniversary_fv {
    padding: 30px 40px 0;
    max-width: 691px;
    margin: 0 auto;
  }
}
@media screen and (min-width: 1080px) {
  .aniversary_fv {
    padding: 0;
    width: auto;
    height: 92vh;
    max-height: 800px;
    text-align: center;
  }
}
.aniversary_fv img {
  width: 100%;
  height: auto;
  aspect-ratio: 691/780;
}
@media screen and (min-width: 1080px) {
  .aniversary_fv img {
    width: auto;
    height: 100%;
    aspect-ratio: 708/800;
  }
}

#aniversary_message {
  padding-bottom: 0px;
}
@media screen and (min-width: 1280px) {
  #aniversary_message {
    padding-top: 100px;
  }
}
#aniversary_message .contents_inner {
  max-width: 709px;
}
#aniversary_message .contents_intro_text {
  font-size: 1.5rem;
}
@media screen and (min-width: 1080px) {
  #aniversary_message .contents_intro_text {
    line-height: 2;
  }
}
#aniversary_message .contents_intro_text + .contents_intro_text {
  margin-top: 1em;
}
@media screen and (min-width: 1080px) {
  #aniversary_message .contents_intro_text + .contents_intro_text {
    margin-top: 1.5em;
  }
}

.aniversary_outline_title {
  font-size: 5.6vw;
  line-height: 1.5em;
  font-weight: 500;
  margin-bottom: 0.4em;
  letter-spacing: 0.1em;
}
@media screen and (min-width: 1280px) {
  .aniversary_outline_title {
    font-size: 5.5rem;
    line-height: 1.4em;
    margin-bottom: 0.6em;
  }
}

.president_block {
  margin-top: 30px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 10px 0;
  max-width: 400px;
}
@media screen and (min-width: 768px) {
  .president_block {
    margin-left: auto;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
        -ms-flex-direction: row;
            flex-direction: row;
    gap: 0 5px;
    -webkit-box-pack: end;
        -ms-flex-pack: end;
            justify-content: flex-end;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    margin-top: 50px;
  }
}
.president_block .president_name {
  position: relative;
}
.president_block .president_name::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  mix-blend-mode: overlay;
  background-color: #fff;
  z-index: 2;
}
.president_block .president_name img {
  width: 100%;
  height: auto;
  -o-object-fit: cover;
     object-fit: cover;
}
.president_block .president_name._img01 {
  width: 45%;
}
.president_block .president_name._img02 {
  width: 50%;
}

#aniversary_history .content_title {
  text-align: center;
}

.history_block {
  margin-top: 100px;
}
@media screen and (min-width: 768px) {
  .history_block {
    margin-top: 150px;
  }
}
@media screen and (min-width: 1080px) {
  .history_block {
    margin-top: 170px;
  }
}
.history_block .history_period {
  font-size: 4rem;
  font-weight: 400;
  font-style: italic;
  font-family: "Libre Baskerville", serif;
  line-height: 1;
}
@media screen and (min-width: 1080px) {
  .history_block .history_period {
    font-size: 6rem;
    text-align: center;
  }
}
.history_block .history_subtitle {
  font-size: 2.8rem;
  margin-top: 20px;
  line-height: 1.4;
  font-weight: 700;
  font-family: "Libre Baskerville", serif;
}
@media screen and (min-width: 1080px) {
  .history_block .history_subtitle {
    font-size: 3.5rem;
    text-align: center;
  }
}

.history_block_text {
  margin-top: 35px;
  line-height: 2;
  font-size: 1.5rem;
}
@media screen and (min-width: 768px) {
  .history_block_text {
    text-align: center;
  }
}
.history_block_text + .history_block_text {
  margin-top: 0;
}

.history_gallary {
  margin-top: 10px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  width: 100%;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  gap: 5px;
}
@media screen and (min-width: 768px) {
  .history_gallary {
    margin-top: 30px;
  }
}

.history_block:nth-of-type(2) .gallary_left {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 5px;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  width: calc(59% - 5px);
}
.history_block:nth-of-type(2) .gallary_left .img {
  width: calc(50% - 2.5px);
}
.history_block:nth-of-type(2) .gallary_left .img img {
  width: 100%;
  height: 100%;
}
.history_block:nth-of-type(2) .gallary_right {
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
  height: auto;
}
.history_block:nth-of-type(2) .gallary_right .img {
  width: 100%;
}
.history_block:nth-of-type(2) .gallary_right .img img {
  -o-object-fit: cover;
     object-fit: cover;
  width: 100%;
  height: auto;
  aspect-ratio: 370/510;
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(2) .gallary_right .img img {
    aspect-ratio: initial;
    max-height: 617px;
  }
}
.history_block:nth-of-type(3) .history_img {
  width: 100%;
  margin-top: 25px;
}
.history_block:nth-of-type(3) .history_img img {
  width: 100%;
  height: auto;
}
.history_block:nth-of-type(3) .history_gallary {
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  margin-top: 5px;
}
@media screen and (min-width: 1080px) {
  .history_block:nth-of-type(3) .history_gallary {
    gap: 5px;
  }
}
.history_block:nth-of-type(3) .history_gallary .img {
  height: auto;
  width: calc(25% - 5px);
}
.history_block:nth-of-type(3) .history_gallary .img img {
  width: 100%;
  height: auto;
  max-height: 174px;
}
.history_block:nth-of-type(3) .history_gallary_flex {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 10px;
  margin-top: 30px;
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(3) .history_gallary_flex {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
        -ms-flex-direction: row;
            flex-direction: row;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    gap: 5px;
    margin-top: 35px;
  }
}
.history_block:nth-of-type(3) .history_gallary_flex .gallary_left {
  width: calc(70% - 5px);
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(3) .history_gallary_flex .gallary_left {
    width: 74%;
  }
}
.history_block:nth-of-type(3) .history_gallary_flex .gallary_left .img {
  width: 100%;
}
.history_block:nth-of-type(3) .history_gallary_flex .gallary_left .img img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
}
.history_block:nth-of-type(3) .history_gallary_flex .gallary_right {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 5px;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  width: calc(34% - 5px);
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(3) .history_gallary_flex .gallary_right {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    width: calc(33% - 5px);
    gap: 5px;
  }
}
@media screen and (min-width: 1080px) {
  .history_block:nth-of-type(3) .history_gallary_flex .gallary_right {
    width: 36.5%;
  }
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(3) .history_gallary_flex .gallary_right .img {
    width: 100%;
  }
}
.history_block:nth-of-type(3) .history_gallary_flex .gallary_right .img img {
  width: 100%;
  height: auto;
  aspect-ratio: 348/200;
}
.history_block:nth-of-type(3) .history_gallary_group {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 30px;
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(3) .history_gallary_group {
    margin-top: 35px;
  }
}
.history_block:nth-of-type(3) .history_gallary_group .img {
  width: 16.6666666667%;
}
@media screen and (min-width: 768px) {
  .history_block:nth-of-type(3) .history_gallary_group .img {
    width: 16.6666666667%;
    max-width: 180px;
  }
}
.history_block:nth-of-type(3) .history_gallary_group .img img {
  width: 100%;
  height: auto;
  max-height: 156px;
}
.history_block:nth-of-type(4) .history_gallary {
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
}
@media screen and (min-width: 1080px) {
  .history_block:nth-of-type(4) .history_gallary {
    gap: 5px;
  }
}
.history_block:nth-of-type(4) .history_gallary .img {
  width: calc(33.3333333333% - 5px);
}
.history_block:nth-of-type(4) .history_gallary .img img {
  width: 100%;
  height: auto;
  aspect-ratio: 360/240;
}
.history_block:nth-of-type(4) .history_img {
  margin-top: 5px;
}
.history_block:nth-of-type(4) .history_img img {
  width: 100%;
  height: auto;
}
.history_block + .history_block {
  position: relative;
}
.history_block + .history_block::before {
  content: "";
  position: absolute;
  top: -90px;
  left: 50%;
  width: 1px;
  height: 0px;
  -webkit-transition: 1s all;
  transition: 1s all;
  background-color: #000000;
}
@media screen and (min-width: 768px) {
  .history_block + .history_block::before {
    top: -130px;
  }
}
@media screen and (min-width: 1280px) {
  .history_block + .history_block::before {
    top: -140px;
  }
}
.history_block + .history_block.scroll::before {
  height: 80px;
}
@media screen and (min-width: 768px) {
  .history_block + .history_block.scroll::before {
    height: 100px;
  }
}
@media screen and (min-width: 1280px) {
  .history_block + .history_block.scroll::before {
    height: 120px;
  }
}

.history_bottom_text {
  margin-top: 30px;
  text-align: center;
  font-size: 1.8rem;
  line-height: 1.8;
}
@media screen and (min-width: 768px) {
  .history_bottom_text {
    margin-top: 50px;
    font-size: 2.4rem;
  }
}
@media screen and (min-width: 1080px) {
  .history_bottom_text {
    margin-top: 70px;
  }
}

#aniversary_linklist {
  padding: 40px 5vw 0px 5vw;
}
@media screen and (min-width: 768px) {
  #aniversary_linklist {
    padding: 70px 30px 0px 30px;
  }
}
@media screen and (min-width: 1080px) {
  #aniversary_linklist {
    padding: 100px 35px 0px 35px;
  }
}
@media screen and (min-width: 1280px) {
  #aniversary_linklist {
    padding: 120px 40px 0px 40px;
  }
}
@media screen and (min-width: 768px) {
  #aniversary_linklist .contents_inner {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    gap: 0px 20px;
  }
}
@media screen and (min-width: 1280px) {
  #aniversary_linklist .contents_inner {
    gap: 0px 40px;
  }
}

.about_linklist_item + .about_linklist_item {
  margin-top: 15px;
}
@media screen and (min-width: 768px) {
  .about_linklist_item {
    width: 50%;
  }
  .about_linklist_item + .about_linklist_item {
    margin-top: 0px;
  }
}

.about_linklist_link {
  padding: 30px 10px 30px 10px;
  position: relative;
  display: inline-block;
  width: 100%;
  text-align: center;
  background-position: center;
  background-size: cover;
  z-index: 1;
  overflow: hidden;
}
@media screen and (min-width: 768px) {
  .about_linklist_link {
    padding: 40px 10px 40px 10px;
  }
}
@media screen and (min-width: 1080px) {
  .about_linklist_link {
    padding: 60px 10px 60px 10px;
  }
}
@media screen and (min-width: 1280px) {
  .about_linklist_link {
    padding: 75px 10px 75px 10px;
  }
}
.about_linklist_link:after {
  content: "";
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0px;
  top: 0px;
  background-position: center;
  background-size: cover;
  z-index: -1;
}
.about_linklist_link:before {
  content: "";
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0px;
  top: 0px;
  background-color: rgba(40, 40, 40, 0.5);
}
.about_linklist_link._about:after {
  background-image: url(../../img/about/link_img01.webp);
}
.about_linklist_link._archive:after {
  background-image: url(../../img/about/link_img02.webp);
}
@media screen and (min-width: 768px) {
  .about_linklist_link .content_title {
    margin-bottom: 15px;
  }
}
.about_linklist_link .notice {
  color: #fff;
  position: relative;
  z-index: 11;
  line-height: 1em;
  font-weight: 600;
  font-size: 1.6rem;
}
@media screen and (min-width: 768px) {
  .about_linklist_link .notice {
    font-size: 1.7rem;
  }
}
@media screen and (min-width: 1080px) {
  .about_linklist_link .notice {
    font-size: 1.8rem;
  }
}
.about_linklist_link .btn {
  margin-top: 10px;
}
@media screen and (min-width: 1080px) {
  .about_linklist_link:before, .about_linklist_link:after {
    -webkit-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
  }
  .about_linklist_link:hover:before {
    background-color: rgba(40, 40, 40, 0.8);
  }
  .about_linklist_link:hover:after {
    -webkit-transform: scale(1.1, 1.1);
            transform: scale(1.1, 1.1);
  }
}

.top_page_link {
  margin: 50px auto 0;
  text-align: center;
}
@media screen and (min-width: 1080px) {
  .top_page_link {
    margin: 100px auto 0;
  }
}
.top_page_link a {
  position: relative;
  display: block;
  max-width: 250px;
  margin: 0 auto;
  -webkit-transition: 0.3s all;
  transition: 0.3s all;
  border: solid 2px #787878;
  border-radius: 10px;
  padding: 15px 0;
}
@media screen and (min-width: 1080px) {
  .top_page_link a {
    max-width: 350px;
  }
}
.top_page_link a::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 5px;
  background-color: #000000;
  -webkit-transition: 0.5s all;
  transition: 0.5s all;
}
@media screen and (min-width: 1080px) {
  .top_page_link a::before {
    height: 8px;
  }
}
.top_page_link a::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0;
  height: 5px;
  background-color: #000000;
  -webkit-transition: 0.5s all;
  transition: 0.5s all;
}
@media screen and (min-width: 1080px) {
  .top_page_link a::after {
    height: 8px;
  }
}
.top_page_link a span {
  font-family: "Oswald", sans-serif;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.8;
  color: #000000;
  -webkit-transition: 0.3s all 0.4s;
  transition: 0.3s all 0.4s;
}
@media screen and (min-width: 1080px) {
  .top_page_link a span {
    font-size: 3rem;
  }
}
.top_page_link a .left {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 10px;
  height: 0%;
  border-right: solid 5px #000000;
  -webkit-transition: 0.5s all;
  transition: 0.5s all;
  -webkit-transform: rotate(180deg);
          transform: rotate(180deg);
}
@media screen and (min-width: 1080px) {
  .top_page_link a .left {
    width: 16px;
    border-width: 8px;
  }
}
.top_page_link a .right {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 10px;
  height: 0%;
  border-right: solid 5px #000000;
  -webkit-transition: 0.5s all;
  transition: 0.5s all;
}
@media screen and (min-width: 1080px) {
  .top_page_link a .right {
    width: 16px;
    border-width: 8px;
  }
}
.top_page_link a:hover {
  border-color: #000000;
  border-radius: 0;
}
.top_page_link a:hover .left {
  height: 100%;
}
.top_page_link a:hover .right {
  height: 100%;
}
.top_page_link a:hover:after {
  width: 100%;
}
.top_page_link a:hover::before {
  width: 100%;
}