header {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  @include pc-layout {
    padding: 50px 0;
  }
  @include sp-layout {
    margin-bottom: 4vw;
    padding: 40px 0;
    color: white;
    background-image: $mobile-bg;
    background-size: cover;
    background-position: bottom;
    background-repeat: no-repeat;
  }

  .title,
  .subtitle {
    font-family: GuDianMingChaoTi;
    letter-spacing: 4px;
    @include pc-layout {
      animation: fadeInDown 0.5s ease-out forwards;
    }
    @include sp-layout {
      animation: fadeInDownSP 0.5s ease-out forwards;
    }
  }

  .title {
    transition: color 0.3s ease-out;
    @include pc-layout {
      font-size: 48px;
      line-height: 60px;
    }
    @include sp-layout {
      font-size: 44px;
      line-height: 56px;
    }
    &:hover {
      color: $link-color;
    }
  }

  .subtitle {
    @include pc-layout {
      font-size: 22px;
      line-height: 32px;
    }
    @include sp-layout {
      font-size: 20px;
      line-height: 30px;
    }
  }

  nav {
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    @include pc-layout {
      margin-top: 10px;
      padding: 0 32px;
      height: 60px;
      background-color: $bg-dark;
      box-shadow: 0 0 10px $bg-dark-dim inset;
      transition: all 0.5s ease;
      animation: fadeIn 0.5s ease-out;
      &:hover {
        border-radius: 30px;
      }
    }
    @include sp-layout {
      width: 100%;
      height: 56px;
      transform: translateY(40px);
      text-shadow: 0 0 1px $bg-dark-dim;
      box-shadow: 0 -1px 2px $bg-dark;
      backdrop-filter: blur(4px) ;

      .router-link-exact-active {
        color: $purple;
      }
    }

    a {
      display: flex;
      flex-direction: column;
      justify-content: space-around;
      align-items: center;
      width: 50px;
      transition: color 0.3s ease;

      @include pc-layout {
        font-size: $font-size-large;
        &:hover {
          color: $link-color;
        }
      }
      @include sp-layout {
        font-size: $font-size-normal;
      }
    }
  }
}
