@charset "UTF-8";

html {
  font-size: 62.5%
}

body {
  font-family: "Noto Serif JP", serif ;
  font-optical-sizing: auto;
  font-weight: 500;
  font-style: normal;
  line-height: normal
}
.ex-concept,.ex-detail {
  font-family: "Noto Sans JP", sans-serif;
  font-optical-sizing: auto;
  font-style: normal;
}
.br-sp {
  display: none;
}

.br-sp430 ,.br-sp320{
  display: none;
}

@media (max-width: 768px) {
  .About,
  .Work,
  .Contact {
    margin: 0 2.5rem 2.5rem
  }

  .br-sp {
    display: block
  }
}

@media (max-width: 430px) {
  .br-sp430 {
    display: block
  }

}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 6rem;
  background: #FFF;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4rem;
  z-index: 100;
}

.mark {
  display: flex;
  padding: 3rem 0 3rem 0;
  text-decoration: none
}

.logo-img {
  width: 11rem
}

.mark-mb {
  display: none
}

.main-nav {
  display: flex;
  list-style: none
}

.topic {
  width: 85%;
  color: #242424;
  font-size: 2.25rem;
  font-weight: 400;
  padding: 3rem;
  text-decoration: none
}

@media (max-width: 768px) {

  /* ここに記述した分は、スマホ用の形になる（レスポンス対応）*/
  .header {
    height: 40px;
    padding: 13px 3.4%;
  }

  .main-nav {
    display: flex;
    flex-direction: column;
    margin-top: 2rem;
    margin-left: 5%;
    text-align: left
  }

  .mark-mb {
    display: block
  }

  .topic {
    font-weight: 400;
    font-size: 3rem;
  }

  #g-nav {
    /*position:fixed;にし、z-indexの数値を大きくして前面へ*/
    position: fixed;
    z-index: 999;
    /*ナビのスタート位置と形状*/
    top: 0;
    right: -120%;
    width: 100%;
    height: 100vh;
    /*ナビの高さ*/
    background: rgba(125, 125, 125, 0.90);
    /*動き*/
    transition: all 0.6s;
  }

  /*アクティブクラスがついたら位置を0に*/
  #g-nav.panelactive {
    right: 0;
  }

  /*ナビゲーションの縦スクロール*/
  #g-nav.panelactive #g-nav-list {
    /*ナビの数が増えた場合縦スクロール*/
    position: fixed;
    z-index: 999;
    width: 100%;
    height: 100vh;
    /*表示する高さ*/
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }

  /*ナビゲーション*/
  #g-nav ul {
    /*ナビゲーション天地中央揃え*/
    position: absolute;
    z-index: 999;
    top: 40%;
    left: 15%;
    transform: translate(-50%, -50%);
  }

  /*リストのレイアウト設定*/

  #g-nav li {
    list-style: none;
    text-align: center;
  }

  #g-nav li a {
    color: #333;
    text-decoration: none;
    padding: 10px;
    display: block;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: bold;
  }

  /*========= ボタンのためのCSS ===============*/
  .openbtn1 {
    position: fixed;
    z-index: 9999;
    /*ボタンを最前面に*/
    top: 10px;
    right: 10px;
    cursor: pointer;
    width: 50px;
    height: 50px;
  }

  /*×に変化*/
  .openbtn1 span {
    display: inline-block;
    transition: all .4s;
    position: absolute;
    left: 14px;
    height: 3px;
    border-radius: 2px;
    background-color: #666;
    width: 45%;
  }

  .openbtn1 span:nth-of-type(1) {
    top: 15px;
  }

  .openbtn1 span:nth-of-type(2) {
    top: 23px;
  }

  .openbtn1 span:nth-of-type(3) {
    top: 31px;
  }

  .openbtn1.active span:nth-of-type(1) {
    top: 18px;
    left: 18px;
    transform: translateY(6px) rotate(-45deg);
    width: 30%;
  }

  .openbtn1.active span:nth-of-type(2) {
    opacity: 0;
  }

  .openbtn1.active span:nth-of-type(3) {
    top: 30px;
    left: 18px;
    transform: translateY(-6px) rotate(45deg);
    width: 30%;
  }
}

@media (min-width: 1440px) {
  header {
    padding: 0 8rem;
  }
  .topic {
    font-size: 2.5rem
}
}
@media (min-width: 1550px) {
  header {
    height: 7.5rem
}
.logo-img {
    width: 15rem;
}
.topic {
  font-size: 3rem
}
}
footer {
  width: 100%;
  height: 3.125rem;
  background-color: #ECEAEA
}

.copyright {
  color: #7D7D7D;
  font-size: 1.5rem;
  text-align: center;
  padding-top: 0.5rem
}