html{
  margin: 0;
  padding: 0;
  font-size: 10px;
  scroll-behavior: smooth;
}

body{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root{
  /* collors */
  --white: #ffffff;
  --black: #000000;
  --pale-white: rgba(255, 255, 255, 0.35);
  --gray: #D9D9D9;
/* font-familys */
  --default-font-family: 'helvetica';
  /* font-sise */
  --title-font-sise: 2rem;
  --subtitle-font-sise: 1.5rem;
  --accent-font-sise: 1.25rem;
  --default-font-sise: 1rem;
  --desc-font-sise: 0.8rem;
  /* shadow */
  --section-shadow: 0 0 10px rgba(0, 0, 0, .1);
  /* texts */
  --default-letter-space: 0.1rem;
  --default-line-height: 2.5rem;
}

/* ボックス要素類 */
div{
  box-sizing: border-box;
}

a,h1,h2,h3,h4,h5,h6,p{
  margin: 0;
  letter-spacing: var(--default-letter-space);
  font-family: var(--default-font-family);
  font-weight: lighter;
}
a{
  text-decoration: none;
}







header{
  position: fixed;
  top: 0;
  left: 0;
  
  width: 100dvw;
  height: 80px;

  z-index: 1000;
}
  .news-belt{
    height: 20px;
    background-color: var(--gray);
  }
  .header-nav{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60px;
    background-color: var(--white);
  }
    .logo-box{
      width: auto;
      height: auto;
    }
      .logo-box h1{
        font-size: var(--subtitle-font-sise);
        color: var(--black);
        font-weight: lighter;
      }









footer{
  width: 100dvw;
  height: auto;

  margin-top: 150px;
  border-top: solid 0.5px var(--black);
  border-bottom: solid 0.5px var(--black);
}
  .footer-nav{
    width: 100%;
    display: flex;
    justify-content: center;
  }
    footer .container{
      max-width: 1170px;
      width: 100%;
    }
      footer .container .content-box{
        width: 100%;
        display: flex;
        justify-content: center;
        gap: 50px;

        padding: 50px 0;
      }
        footer .nav-block{
          display: flex;
          flex-direction: column;
          gap: 20px;
        }
          footer .nav-block h6{
            font-size: var(--accent-font-sise);
          }
          footer .nav-block .nav-item{
            display: flex;
            flex-direction: column;
            gap: 5px;
          }
            footer .nav-block .nav-item p a{
              text-decoration: none;
              color: var(--black);

              transition: 0.5s;
            }
            footer .nav-block .nav-item p a:hover{
              text-decoration: underline;
            }
  .footer-sitemap{
    width: 100%;
    display: flex;
    justify-content: center;
    border-top: solid 0.5px var(--black);
    border-bottom: solid 0.5px var(--black);
  }
      .footer-sitemap .content-box{
        opacity: 0;
        height: 0;
        padding: 0 !important;

        transition: 0.5s;
      }
      .footer-sitemap.active .content-box{
        height: auto;
        padding: 50px 0 !important;
        opacity: 1;
      }
  .footer-bottom{
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 50px 0;
  }
    .footer-bottom .text-box{
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
      .footer-bottom .text-box p{
        color: var(--black);
      }
    .footer-bottom .logo-box{
      display: flex;
      justify-content: center;
      margin: 50px 0 0;
    }
      .footer-bottom .logo-box img{
        width: 200px;
      }





@media screen and (max-width: 900px){
  footer .container{
    max-width: 100%;
    padding: 0 30px;
  }
}



      

@media screen and (max-width: 440px){

  footer .content-box{
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

}







#ytPlayerWrap{
  position: relative;
  height: 100%;
  width: 100%;
}