@charset 'utf-8';

/* 共通部分 */
html {
  font-size: 100%;
  scroll-behavior: smooth;
}
:root {
  --color: #121212;
}
body {
  color: var(--color);
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 300;
}
a {
  color: var(--color);
  text-decoration: none;
}
img {
  max-width: 100%;
}
li {
  list-style: none;
}
/* コンテンツ幅を設定するための共通クラス */
.wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}
/* セクションタイトル用の共通クラス */
.sec-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  font-size: 1.25rem;
  font-weight: bold;
  text-align: center;
}
.sec-title::before,
.sec-title::after {
  content: "";
  width: 18%;
  border-top: 1px solid;
}

/* z-index → nav, hamburger > header, mask > section > video */

/* Header */
.header {
  position: fixed;
  top: 0;
  z-index: 10;
  width: 100%;
  height: 72px;
  background: #fff;
}
.header__logo {
  position: relative;
  left: 18px;
  top: 10px;
  width: 180px;
  line-height: 1px;
}
.header__nav {
  position: fixed;
  top: 0;
  left: -300px;
  z-index: 20;
  width: 300px;
  height: 100%;
  padding: 35px 25px;
  background: #ffffff;
  opacity: 0;
  transition: 0.5s;
}
.open .header__nav {
  left: 0;
  opacity: 1;
}
.header__sns {
  margin-top: 50px;
}
.header__menu-item,
.sns__item {
  font-size: 0.875rem;
}
.header__menu-item + .header__menu-item,
.header__sns-item + .header__sns-item {
  margin-top: 20px;
}
.header__hamburger {
  position: fixed;
  top: 22px;
  right: 18px;
  z-index: 20;
  width: 30px;
  height: 30px;
  transition: 0.5s;
  cursor: pointer;
}
.header__hamburger-line {
  position: absolute;
  left: 0;
  width: 30px;
  height: 2px;
  border-radius: 4px;
  background-color: var(--color);
  transition: 0.5s;
}
.header__hamburger-line--top {
  top: 4px;
}
.header__hamburger-line--middle {
  top: 14px;
}
.header__hamburger-line--bottom {
  bottom: 4px;
}
.open .header__hamburger-line {
  background-color: #fff;
}
.open .header__hamburger-line--top {
  transform: translateY(10px) rotate(-315deg);
}
.open .header__hamburger-line--middle {
  opacity: 0;
}
.open .header__hamburger-line--bottom {
  transform: translateY(-10px) rotate(315deg);
}
.header__mask {
  display: none;
  transition: 0.5s;
}
.open .header__mask {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 10;
  background: #000;
  opacity: 0.8;
  cursor: pointer;
}

/* Video */
.video {
  width: 100%;
  height: 80vh;
}
.bg-video {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  z-index: -10;
  height: 520px;
}

/* Project */
.project {
  padding: 60px 0;
  background: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.8));
  color: #fff;
}
.project__list {
  display: flex;
  flex-direction: column;
  gap: 30px;
}
.project__item {
  position: relative;
  border: 1px solid #ffffff;
}
.project__link::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  box-shadow: 0 -30px 15px -1px #2e2e2e inset;
}
.project__name {
  position: absolute;
  bottom: 4px;
  left: 7px;
  z-index: 5;
  color: #fff;
  font-size: 0.75rem;
}

/* Feature */
.feature {
  padding: 60px 0 120px;
  background: rgba(0, 0, 0, 0.8);
  color: #ffffff;
}
.feature__list {
  display: flex;
  justify-content: space-between;
}
.feature__item {
  width: 30%;
  font-size: 0.875rem;
  text-align: center;
}
.feature__link {
  position: relative;
  display: block;
  width: 100%;
  padding: calc(50% - 12px) 0;
  border: 1px solid #ffffff;
  border-radius: 50%;
  color: #ffffff;
  overflow: hidden;
}
.feature__link::before {
  position: absolute;
  top: 0;
  left: -100%;
  content: "";
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #fff;
  opacity: 0.3;
  transition: 0.5s;
}
.feature__link:hover::before {
  left: 0;
}
.feature__item-title {
  margin-top: 15px;
  font-weight: bold;
}
.feature__text {
  margin-top: 5px;
  font-size: 0.875rem;
}

/* Flow */
.flow {
  padding: 60px 0 50px;
  background: #ffffff;
}
.flow__step {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.flow__figure {
  position: relative;
  margin-top: 30px;
}
.flow__figure::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: 50px;
  height: 600px;
  margin: 0 auto;
  background-color: #ffdd00;
}
.flow__figure-item {
  position: relative;
  width: calc(100vw - 80px);
  height: 80px;
  background-color: #414141;
  color: #ffffff;
  font-size: 0.875rem;
  text-align: center;
  line-height: 80px;
}
.flow__figure-item::after {
  content: "";
  position: absolute;
  top: 80px;
  left: 0;
  border-top: 30px solid #414141;
  border-left: calc(50vw - 40px) solid transparent;
  border-right: calc(50vw - 40px) solid transparent;
}
.flow__figure-item + .flow__figure-item {
  margin-top: 60px;
}
.flow__desc {
  margin-top: 80px;
  margin-left: 50px;
}
.flow__term {
  position: relative;
  margin-top: 43px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color);
  font-size: 1.25rem;
}
.flow__term:first-child {
  margin-top: 0;
}
.flow__number {
  display: block;
  position: absolute;
  bottom: 0;
  left: -45px;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  background-color: #414141;
  color: #ffffff;
  font-size: 1rem;
  text-align: center;
  line-height: 35px;
}
.flow__detail {
  margin-top: 10px;
}

/* Contant */
.contact {
  padding: 60px 0 120px;
  background: #ffffff;
}
.contact__links {
  margin-top: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.contact__item {
  display: block;
  position: relative;
  width: 60%;
  padding: 50px 0;
  border: 1px solid var(--color);
  text-align: center;
  transition: 0.1s;
}
.contact__item::before {
  position: absolute;
  content: "";
  right: 4px;
  bottom: 4px;
  border: 10px solid transparent;
  border-right: 10px solid #121212;
  border-bottom: 10px solid #121212;
}
.contact__item + .contact__item {
  margin-top: 20px;
}
.contact__item:hover {
  outline: solid 3px var(--color);
}

/* Footer */
.footer {
  padding: 50px 0 20px;
  background-color: var(--color);
  color: #ffffff;
}
.footer__to-top {
  position: fixed;
  right: 25px;
  bottom: 25px;
  width: 50px;
  height: 50px;
  border: 1px solid #ffffff;
  border-radius: 50%;
  background-color: var(--color);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s;
}
.footer__to-top::after {
  position: relative;
  content: "";
  left: 17px;
  bottom: 3px;
  border: 7px solid transparent;
  border-bottom: 7px solid #fff;
}
.footer__to-top.show {
  opacity: 1;
  pointer-events: auto;
}
.footer__menu {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 0;
  font-size: 0.875rem;
}
.footer__menu-item {
  padding: 0 20px;
}
.footer__menu-item + .footer__menu-item {
  border-left: solid 1px #fff;
}
.footer__menu-link {
  color: #ffffff;
}
.footer__copyright {
  margin-top: 60px;
  font-size: 0.75rem;
  text-align: center;
}

/* PC表示 */
@media (min-width: 960px) {
  /* 共通部分 */
  /* サイドメニューの横幅分だけ左にmarginをとる */
  .container {
    margin-left: 300px;
  }
  .sec-title {
    margin-bottom: 60px;
    font-size: 1.75rem;
  }
  .sec-title::before,
  .sec-title::after {
    width: 28%;
  }

  /* Header */
  .header {
    width: 300px;
    height: 100%;
    padding: 40px 45px;
  }
  .header__logo {
    position: static;
    left: auto;
    top: auto;
    width: 200px;
  }
  .header__nav {
    position: static;
    left: auto;
    top: auto;
    width: 100%;
    height: 100%;
    padding: 0;
    opacity: 1;
    transition: 0;
  }
  .header__menu {
    margin-top: 38px;
  }
  .header__sns {
    margin-top: 76px;
  }
  .header__menu-item + .header__menu-item,
  .header__sns-item + .header__sns-item {
    margin-top: 16px;
  }
  .header__hamburger {
    display: none;
  }

  /* Video */
  .video {
    height: 100vh;
  }
  .bg-video {
    top: -220px;
    height: initial;
  }

  /* Project */
  .project {
    padding: 80px 0;
  }
  .project__list {
    flex-direction: row;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 50px 0;
  }
  .project__item {
    width: 47%;
  }

  /* Feature */
  .feature {
    padding: 80px 0 160px;
  }

  /* Flow */
  .flow {
    padding: 120px 0 50px;
    background: #ffffff;
  }
  .flow__step {
    flex-direction: row;
    align-items: flex-start;
    margin-top: 60px;
  }
  .flow__figure {
    margin-top: 0;
  }
  .flow__figure-item {
    width: 200px;
  }
  .flow__figure-item::after {
    border-left: 100px solid transparent;
    border-right: 100px solid transparent;
  }
  .flow__desc {
    margin-top: 0;
    margin-left: 10%;
  }

  /* Contant */
  .contact {
    padding: 80px 0 160px;
  }
  .contact__links {
    flex-direction: row;
    justify-content: space-between;
    margin-top: 60px;
  }
  .contact__item {
    width: 30%;
  }
  .contact__item + .contact__item {
    margin-top: 0;
  }

  /* Footer */
  .footer__menu {
    justify-content: center;
  }
}