@charset "UTF-8";
:root {
  font-size: 16px;
}

.p-prototype {
  margin-top: 202px;
}
.p-prototype__intro {
  position: relative;
  width: 740px;
  margin: 0 auto;
  overflow: hidden;
}
.p-prototype__intro::before, .p-prototype__intro::after {
  content: "";
  display: block;
  position: absolute;
  height: 3px;
  margin: auto;
  background: #fff;
  transition: all 0.2s ease;
  z-index: 2;
}
.p-prototype__intro::before {
  top: -1px;
  right: 12px;
  width: 490px;
}
.p-prototype__intro::after {
  bottom: -1px;
  left: 12px;
  width: 100%;
  transition: 0.2s 1s ease;
}
.p-prototype__intro.u-is_inited::after {
  width: 490px;
}
.p-prototype__intro.u-is_inited .c-box {
  border: 1px solid #979797;
}
.p-prototype__intro.u-is_inited .c-box::before {
  top: -210px;
  left: 240px;
}
.p-prototype__intro.u-is_inited .c-box::after {
  right: 240px;
  bottom: -210px;
}
.p-prototype__intro .c-box {
  position: relative;
  padding: 46px 14px 14px 70px;
  z-index: 1;
}
.p-prototype__intro .c-box::before, .p-prototype__intro .c-box::after {
  content: "";
  display: block;
  position: absolute;
  height: calc(100% + 3px);
  width: 315px;
  margin: auto;
  background: #fff;
  z-index: -1;
}
.p-prototype__intro .c-box::before {
  top: -1px;
  left: -1px;
  transition: top 0.4s 0.8s linear, left 0.4s 1.2s linear;
}
.p-prototype__intro .c-box::after {
  right: -1px;
  bottom: -2px;
  transition: bottom 0.4s 1.4s linear, right 0.4s 1.8s linear;
}
.p-prototype__intro .c-ttl {
  text-align: left;
  font-size: 14px;
  line-height: 1;
  letter-spacing: 0.136em;
}
.p-prototype__intro .c-txt {
  margin-top: 25px;
  font-size: 20px;
  line-height: 1.55;
  letter-spacing: 0.1em;
}
.p-prototype__intro .c-txt .font-small {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.58;
  letter-spacing: 0.06em;
}
.p-prototype__intro .c-btn {
  display: table;
  margin: 34px 0 0 auto;
  padding: 4px 18px;
  color: #fff;
  font-size: 12px;
  line-height: 1;
  letter-spacing: -0.021em;
  background: #000;
  border-radius: 12px;
}
.p-prototype__list {
  margin-top: 282px;
}
.p-prototype__item {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  padding: 42px 58px 46px 54px;
  background: #f7f7f7;
}
.p-prototype__item:not(:first-of-type) {
  margin-top: 120px;
}
.p-prototype__num, .p-prototype__hdg {
  position: relative;
  display: inline-block;
  z-index: 0;
}
.p-prototype__num::after, .p-prototype__hdg::after {
  content: "";
  position: absolute;
  display: block;
  margin: auto;
  background: #fff;
  z-index: -1;
}
.p-prototype__num::after {
  bottom: 0;
  width: 48px;
  height: 6px;
}
.p-prototype__num img {
  width: auto;
  height: 25px;
}
.p-prototype__hdg::after {
  top: 50%;
  width: 150%;
  height: 24px;
  margin-top: -12px;
}
.p-prototype__hdg img {
  width: auto;
  height: 54px;
  margin-left: 10px;
}
.p-prototype__txt {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.66;
  letter-spacing: 0.001em;
}
.p-prototype__txt + .p-prototype__txt {
  margin-top: 20px;
}
.p-prototype__issue {
  margin-top: 20px;
}
.p-prototype__issue .c-hdg {
  text-align: left;
  font-weight: normal;
  border-bottom: 1px solid #000;
  font-size: 11px;
  line-height: 1.63;
  letter-spacing: 0.134em;
}
.p-prototype__issue .c-list {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.33;
  letter-spacing: 0.016em;
}
.p-prototype__issue .c-item {
  position: relative;
  padding-left: 1em;
}
.p-prototype__issue .c-item::before {
  content: "・";
  position: relative;
  position: absolute;
  left: 0;
  display: inline-block;
}
.p-prototype__img {
  margin-top: 12px;
}
@media (min-width: 769px) {
  .p-prototype__num::after, .p-prototype__hdg::after {
    left: 50%;
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
  }
  .p-prototype__hdg::after {
    margin-left: 20%;
  }
  .p-prototype__issue {
    width: 412px;
  }
  .p-prototype__img {
    width: 386px;
  }
  .p-prototype__thumb {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-top: 32px;
  }
  .p-prototype__thumb img {
    width: 276px;
  }
}
@media (max-width: 768px) {
  .p-prototype {
    margin-top: 32vw;
  }
  .p-prototype__intro {
    width: 69.87vw;
  }
  .p-prototype__intro::before {
    right: 1.07vw;
    width: 46.4vw;
  }
  .p-prototype__intro::after {
    left: 1.07vw;
  }
  .p-prototype__intro.u-is_inited::after {
    width: 46.4vw;
  }
  .p-prototype__intro.u-is_inited .c-box::before {
    top: -52.27vw;
    left: 22.67vw;
  }
  .p-prototype__intro.u-is_inited .c-box::after {
    right: 22.67vw;
    bottom: -52.8vw;
  }
  .p-prototype__intro .c-box {
    padding: 11.2vw 9.07vw 8vw 7.47vw;
  }
  .p-prototype__intro .c-box::before, .p-prototype__intro .c-box::after {
    width: 22.67vw;
  }
  .p-prototype__intro .c-box::before {
    transition: top 0.4s 0.8s linear, left 0.6s 1.2s linear;
  }
  .p-prototype__intro .c-box::after {
    transition: bottom 0.4s 1.4s linear, right 0.6s 1.8s linear;
  }
  .p-prototype__intro .c-ttl {
    font-size: 10px;
    letter-spacing: 0.12em;
  }
  .p-prototype__intro .c-txt {
    margin-top: 1.07vw;
    font-size: 12px;
    line-height: 1.66;
    letter-spacing: 0.001em;
  }
  .p-prototype__intro .c-txt .font-small {
    margin-top: 2.13vw;
    font-size: 10px;
    line-height: 1.6;
    letter-spacing: 0.004em;
  }
  .p-prototype__intro .c-btn {
    margin: 5.87vw auto 0;
    padding: 0.8vw 2.13vw;
    font-size: 10px;
    line-height: 1;
    letter-spacing: -0.021em;
  }
  .p-prototype__list {
    margin-top: 24.53vw;
  }
  .p-prototype__item {
    padding: 5.33vw 6.93vw 10.67vw 6.4vw;
  }
  .p-prototype__item:not(:first-of-type) {
    margin-top: 21.33vw;
  }
  .p-prototype__num::after {
    width: 12.8vw;
    height: 1.6vw;
  }
  .p-prototype__num img {
    margin-left: 1.6vw;
  }
  .p-prototype__hdg::after {
    width: 132%;
    max-width: 76vw;
  }
  .p-prototype__hdg img {
    height: 14.4vw;
    margin-left: 2.67vw;
  }
  .p-prototype__txt {
    margin-top: 4.8vw;
    font-size: 12px;
    line-height: 1.66;
    letter-spacing: -0.02em;
  }
  .p-prototype__txt + .p-prototype__txt {
    margin-top: 5.33vw;
  }
  .p-prototype__issue {
    order: 1;
    margin-top: 5.07vw;
  }
  .p-prototype__issue .c-hdg {
    padding-bottom: 0.27vw;
    font-size: 11px;
    line-height: 1.2;
    letter-spacing: 0.134em;
  }
  .p-prototype__issue .c-list {
    margin-top: 1.87vw;
    margin-left: 1.33vw;
    font-size: 12px;
    line-height: 1.5;
    letter-spacing: -0.02em;
  }
  .p-prototype__issue .c-item {
    padding-left: 0.5em;
  }
  .p-prototype__issue .c-item::before {
    left: -0.5em;
  }
  .p-prototype__img {
    margin-top: 6.93vw;
  }
}