img {
  width: 100%;
  height: auto;
  vertical-align: bottom;
}
.main {
  width: 100%;
  padding: 0;
}
.top-block {
  position: relative;
  z-index: 1;
}
.main-block {
  position: relative;
  width: 100%;
  margin-top: -22vw;
  padding-bottom: 1.5vw;
}
.main-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 130%;
  background-image: url('/100th_anniversary/img/bg_main_pc.webp');
  background-size: 100%;
  z-index: -1;
}
.main-wrap {
  width: 92%;
  max-width: 1100px;
  margin: 0 auto;
  padding-top: 32vw;
}
.main-block__ttl {
  margin-bottom: 30px;
  padding: 10px 0;
  color: #1C296F;
  font-size: 4.8rem;
  font-weight: 700;
  letter-spacing: .3rem;
  border-top: 2px solid #1C296F;
  border-bottom: 2px solid #1C296F;
}
.main-block__txt {
  color: #333;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: .03rem;
  line-height: 1.8;
}
.main-block__txt:first-of-type {
  margin-bottom: 30px;
}
.main-block__logo {
  width: 61%;
  max-width: 760px;
  margin: 50px auto 60px;
  display: block;
}
.greeting-box {
  max-width: 1160px;
  width: 90%;
  margin: 0 auto;
  padding-right: 30px;
  display: flex;
  align-items: flex-start;
}
.greeting-box__img {
  width: 35%;
  max-width: 432px;
}
.greeting-box__txt {
  margin: 60px 0 45px;
  color: #333;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: 4%;
  line-height: 1.8;
}
.greeting-box__name {
  color: #333;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 3%;
  text-align: right;
}
.greeting-box__name span {
  font-size: 2.4rem;
}
.pc_view {
  display: block;
}
.sp_view {
  display: none;
}
@media screen and (max-width: 1100px) {
  .main-block {
    padding-bottom: 3vw;
  }
  .main-wrap {
    padding-top: 30vw;
  }
  .main-block__ttl {
    font-size: 3rem;
  }
  .main-block__txt, .greeting-box__txt, .greeting-box__name{
    font-size: 1.7rem;
  }
  .greeting-box__txt {
    margin: 30px 0 20px;
  }
  .greeting-box__name span {
    font-size: 2rem;
  }
}
@media screen and (min-width: 768px) {
  .top-block {
    background-image: url('/100th_anniversary/img/bg_top.webp');
    background-position: center bottom;
  }
  .top-txt {
    width: 88%;
    max-width: 1006px;
    margin: 0 auto;
    padding: 5px 0 90px;
  }
  .footer {
    margin-top: -70px;
    padding-top: 9vw;
    z-index: 1;
  }
  .footer::before {
    background-color: unset;
    background-image: url('/100th_anniversary/img/bg_ft_pc.webp');
    background-position: top center;
    background-repeat: no-repeat;
    background-size: auto;
  }
  .footer::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 50%;
    background-color: #eff2f3;
    z-index: -1;
  }
  .footer__link {
    color: #1C296F;
  }
  .footer__lower {
    background-color: #1C296F;
  }
}
@media screen and (max-width: 767px) {
  .pc_view {
    display: none;
  }
  .sp_view {
    display: block;
  }
  .main {
    background-image: url('/100th_anniversary/img/bg_main_sp.webp');
    background-size: 100%;
  }
  .main-block {
    margin: 0;
    padding: 0 0 7vw;
  }
  .main-block::before {
    top: auto;
    bottom: 0;
    height: 9vw;
    background-image: url('/100th_anniversary/img/bg_ft_sp.webp');
    background-size: 100%;
    z-index: 1;
  }
  .main-wrap {
    padding-top: 50px;
  }
  .main-block__ttl {
    margin-bottom: 25px;
    font-size: 2.4rem;
  }
  .main-block__txt {
    font-size: 1.6rem;
  }
  .main-block__txt:first-of-type {
    margin-bottom: 15px;
  }
  .main-block__logo {
    margin: 30px auto 20px;
  }
  .greeting-box {
    width: 92%;
    padding: 0;
    flex-direction: column;
  }
  .greeting-box div {
    order: 1;
  }
  .greeting-box__txt {
    margin: 0 0 20px;
    font-size: 1.6rem;
  }
  .greeting-box__name {
    font-size: 1.6rem;
  }
  .greeting-box__name span {
    font-size: 2.4rem;
  }
  .greeting-box__img {
    width: 61%;
    margin: 40px auto 0;
    order: 2;
  }
}