body {
  font-size: 16px;
}
@media only screen and (min-width: 768px) {
  body {
    font-size: 22px;
  }
}
#big-background {
  width: 100%;
  text-align: center;
  height: 680px;
  overflow: hidden;
  pointer-events: none;
}
@media only screen and (max-width: 767px) {
  #big-background {
    height: 340px;        
  }
  #big-background video{
    display: block;
    object-fit: cover;
    width: 100%;
    height: 100%;
  }
}
.btn-link a {
  color: #fff;
  background: #1F2A66;
  transition: ease 0.3s;
}
.btn-link a:after {
  border-color: transparent transparent transparent #1F2A66;
}
.btn-link a:hover {
  opacity: 0.8;
}
.wrap-660 {
  max-width: 660px;
  margin: 0 auto;
}
.bg-deco, footer {
  position: relative;
}
.bg-deco:before, footer:before {
  content: "";
  position: absolute;
  z-index: 5;
  top: 0;
  left: calc(50% + 428px);
  background: url("../img/shared/line.png") repeat-y top center;
  width: 22px;
  height: 100%;
}
@media only screen and (max-width: 767px) {
  .bg-deco:before, footer:before {
    left: calc(50% + 200px);
  }
}
#sec1 {
  padding: 60px 0 17px;
}
#sec1 .ttl {
  margin-bottom: 5px;
}
@media only screen and (max-width: 767px) {
  #sec1 {
    padding: 30px 0 17px;
  }
}
#sec2 {
  padding: 99px 0 23px;
}
#sec2 .ttl {
  color: #1F2A66;
  margin-bottom: 5px;
}
@media only screen and (max-width: 767px) {
  #sec2 {
    padding: 45px 0 17px;
  }
}
#sec3 {
  padding: 99px 0 18px;
}
#sec3 .ttl {
  margin-bottom: 5px;
  border-bottom: 1px solid #fff;
}
#sec3 .sec3-txt1 {
  font-weight: 900;
  font-size: 28px;
  text-align: center;
  margin: 13px 0 11px;
  line-height: 1.4;
}
@media only screen and (max-width: 767px) {
  #sec3 {
    padding: 45px 0 17px;
  }
  #sec3 .ttl {
    padding-bottom: 8px;
  }
  #sec3 .sec3-txt1 {
    font-size: 18px;
    margin: 9px 0 18px;
  }
}
#sec4 {
  padding: 112px 30px 0;
}
#sec4 .wrap {
  max-width: 782px;
}
#sec4 [class^="col"] {
  width: 348px;
}
#sec4 .sec4-item {
  position: relative;
  width: 100%;
}
#sec4 .sec4-item .sec4-inner {
  box-sizing: border-box;
  background: url("../img/index/box_top.jpg") no-repeat top center/100% auto, url("../img/index/box_bottom.jpg") no-repeat bottom center/100% auto, url("../img/index/box_center.jpg") repeat-y top center/100% auto;
  padding: 5px 16px 19px;
}
#sec4 .sec4-item:after {
  content: "";
  display: block;
  margin: 0 auto;
  height: 107px;
  width: 2px;
  background: #000;
}
#sec4 .sec4-item:before {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  height: 20px;
  width: 28px;
  background: url("../img/index/arrow_down.png") no-repeat center/100% auto;
}
#sec4 .sec4-item.arrow-up:before {
  bottom: 89px;
  background: url("../img/index/arrow_up.png") no-repeat center/100% auto;
}
#sec4 .sec4-item.arrow-left {
  margin-bottom: 70px;
}
#sec4 .sec4-item.arrow-left:after {
  position: absolute;
  right: -12%;
  transform: rotate(45deg);
  top: 32px;
}
#sec4 .sec4-item.arrow-left:before {
  left: auto;
  right: -6%;
  bottom: auto;
  top: 110px;
  transform: rotate(45deg);
}
#sec4 .sec4-item.b02:after {
  height: 620px;
}
#sec4 .arrow-right {
  position: relative;
}
#sec4 .arrow-right:after {
  content: "";
  position: absolute;
  right: -12%;
  transform: rotate(-45deg);
  top: 174px;
  height: 107px;
  width: 2px;
  background: #000;
}
#sec4 .arrow-right:before {
  content: "";
  position: absolute;
  right: -25%;
  top: 251px;
  transform: rotate(-45deg);
  height: 20px;
  width: 28px;
  background: url("../img/index/arrow_down.png") no-repeat center/100% auto;
}
#sec4 .col2 .sec4-item:last-child:before, #sec4 .col2 .sec4-item:last-child:after {
  display: none;
}
#sec4 .sec4-ttl {
  text-align: center;
  border-bottom: 1px solid #221816;
  font-family: 'Tiffany';
  font-size: 56px;
  line-height: 56px;
  text-transform: uppercase;
  padding-bottom: 5px;
}
#sec4 .sec4-txt1 {
  font-weight: 900;
  font-size: 26px;
  line-height: 36px;
  margin: 5px 0 10px;
  letter-spacing: 1px;
}
#sec4 .sec4-img {
  width: 100%;
}
#sec4 .sec4-img img {
  width: 100%;
  height: auto;
}
#sec4 .btn-link {
  text-align: center;
  margin-top: 43px;
}
@media only screen and (min-width: 768px) and (max-width: 830px) {
  #sec4 .df {
    justify-content: center;
  }
  #sec4 [class^="col"] {
    width: 315px;
  }
  #sec4 .col1 {
    margin-right: 78px;
  }
  #sec4 .arrow-right:before {
    right: -27%;
    top: 251px;
  }
}
@media only screen and (max-width: 767px) {
  #sec4 {
    margin-top: 52px;
    padding: 0 0 20px;
  }
  #sec4 .wrap {
    padding: 0;
    max-width: 355px;
    margin: 0 auto;
  }
  #sec4 [class^="col"] {
    width: 156px;
  }
  #sec4 .sec4-item .sec4-inner {
    padding: 5px 9px 10px;
  }
  #sec4 .sec4-item:after {
    height: 70px;
    width: 1px;
  }
  #sec4 .sec4-item:before {
    height: 10px;
    width: 14px;
  }
  #sec4 .sec4-item.arrow-up:before {
    bottom: 61px;
    background: url("../img/index/arrow_up.png") no-repeat center/100% auto;
  }
  #sec4 .sec4-item.arrow-left {
    margin-bottom: 70px;
  }
  #sec4 .sec4-item.arrow-left:after {
    position: absolute;
    right: -14%;
    top: 1px;
    height: 57px;
  }
  #sec4 .sec4-item.arrow-left:before {
    left: auto;
    right: -6.5%;
    bottom: auto;
    top: 43px;
    transform: rotate(45deg);
  }
  #sec4 .sec4-item.b02:after {
    height: 357px;
  }
  #sec4 .arrow-right {
    position: relative;
  }
  #sec4 .arrow-right:after {
    right: -14%;
    top: 95px;
    height: 60px;
    width: 1px;
  }
  #sec4 .arrow-right:before {
    right: -30%;
    top: 139px;
    height: 10px;
    width: 14px;
  }
  #sec4 .sec4-ttl {
    font-size: 28px;
    line-height: 28px;
    padding-bottom: 5px;
  }
  #sec4 .sec4-txt1 {
    font-size: 13px;
    line-height: 18px;
    margin: 5px 0;
    letter-spacing: 0;
  }
  #sec4 .btn-link {
    text-align: center;
    margin-top: 38px;
  }
}
#sec5 {
  padding: 112px 0 0;
}
#sec5 .ttl {
  font-size: 32px;
  line-height: 50px;
}
@media only screen and (max-width: 767px) {
  #sec5 {
    padding: 50px 0 25px;
  }
  #sec5 .ttl {
    font-size: 23px;
    line-height: 35px;
  }
}
#sec6 {
  padding: 111px 0 28px;
}
#sec6 h2 {
  margin: 0 -3%;  
  font-weight: 900;
  text-align: center;
  font-size: 32px;
  letter-spacing: 0;
}
#sec6 .btn-link {
  margin: 10px auto 0;
  text-align: center;
}
#sec6 .btn-link a {
  font-family: "Noto Sans JP" !important;
}
#sec6 .sec6-img {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: 1200px;
  margin-top: 27px;
  z-index: 15;
}
@media only screen and (max-width: 767px) {
  #sec6 {
    padding: 50px 0 17px;
  }
  #sec6 h2 {
    margin: 0 auto 20px;
    font-size: 23px;
    line-height: 30px;
    letter-spacing: 0.05em;
  }
  #sec6 .btn-link {
    display: none;
  }
  #sec6 .sec6-img {
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    margin-top: 31px;
  }
}
@media only screen and (min-width: 768px) {
  #sec6 .btn-link a {
    font-size: 20px;
  }
}