hexo-theme-keep/source/css/layout/_partial/header.styl

$header-progress-height = 2.8px;

.header-wrapper {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background-color);
  padding-top: $header-progress-height;

  hover-style(1.02, 1.02);

  .header-content {
    position: relative;
    height: 100%;
    width: $main-content-width;
    max-width: $content-max-width;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    z-index: $z-index-5;

    transition();

    +keep-tablet() {
      width: $main-content-width-tablet !important;
    }

    +keep-mobile() {
      width: $main-content-width-mobile !important;
    }

    .logo-title {
      font-size: 2.2em;
      font-weight: bold;

      +keep-tablet() {
        font-size: 2.0em;
      }

      +keep-mobile() {
        font-size: 1.8em;
      }

      letter-spacing: 1px;
      color: var(--first-text-color);
      transition();
    }


    .menu-list {

      +keep-tablet() {
        display: none;
      }

      .menu-item {
        float: left;
        position: relative;
        margin-left: 30px;

        &:first-child {
          margin-left: 0;
        }

        a {

          &:hover {

            color: var(--default-text-color);

            &::after {
              content: '';
              position: absolute;
              bottom: -10px;
              left: 50%;
              width: 100%;
              height: 2px;
              transform: translateX(-50%);
              background: var(--primary-color);
              transition();
            }
          }

        }


        .active {
          color: var(--second-text-color);
          font-weight: bold;
          transition();

          &::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            width: 100%;
            height: 2px;
            transform: translateX(-50%);
            background: var(--primary-color)
            transition();
          }
        }
      }

    }


    .menu-bar {
      display: none;
      position: relative;
      cursor: pointer;

      +keep-tablet() {
        display: block;
      }


      .menu-bar-middle {
        width: 18px;
        height: 2px;
        margin: 6px 0;
        position: relative;
        background: var(--default-text-color);
        transition();

        &::before {
          content: '';
          position: absolute;
          top: -6px;
          left: 0;
          width: 100%;
          height: 2px;
          background: var(--default-text-color);
          transition();
        }

        &::after {
          content: '';
          position: absolute;
          bottom: -6px;
          left: 0;
          width: 100%;
          height: 2px;
          background: var(--default-text-color);
          transition();
        }
      }
    }
  }


  .header-drawer {
    width: 100%;
    padding: $header-height 0 20px 0;
    position: absolute;
    top: 0;
    left: 0;
    transform: scaleY(0);
    transform-origin: top;
    background: var(--background-color);
    transition();
    z-index: $z-index-2;

    .drawer-menu-list {
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
      align-items: center;

      .drawer-menu-item {

        a {
          display: block;
          margin: 8px auto;
          padding: 0 20px;
          border-radius: 20px;
          text-align: center;
          line-height: 34px;
          color: var(--default-text-color);
          transition();

          &:hover {
            color: var(--second-text-color);
            font-weight: bold;
          }
        }

        .active {
          border: 1px solid var(--default-text-color);
          color: var(--second-text-color);
          font-weight: bold;
        }

      }
    }
  }


  .window-mask {
    position: absolute;
    top: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    z-index: $z-index-1;
    visibility: hidden;
    opacity: 0;
    transition();
  }

}


.header-drawer-show {
  opacity: 1 !important;

  .header-content {
    .menu-bar {
      .menu-bar-middle {

        background: transparent;

        &::before {
          transform: translateY(6px) rotate(45deg);
        }


        &::after {
          transform: translateY(-6px) rotate(-45deg);
        }
      }
    }
  }

  .header-drawer {
    transform: scaleY(1);
  }

  .window-mask {
    visibility: visible;
    opacity: 1;
  }

}

.header-wrapper-shrink {

  .header-content {

    .logo-title {
      transform: scale(0.8);
      transform-origin: left top;
    }

    .menu-list {
      .menu-item {
        a:hover {
          &::after {
            bottom: -($header-shrink-height / 2 - 12);
          }
        }

        .active::after {
          bottom: -($header-shrink-height / 2 - 12);
        }
      }

    }
  }


  .header-drawer {
    padding: $header-shrink-height 0 20px 0;
  }
}