ngx-admin/src/app/@theme/components/header/header.component.scss

@import '../../styles/themes';
@import '~@nebular/theme/styles/global/bootstrap/hero-buttons';
@import '~bootstrap/scss/mixins/breakpoints';
@import '~@nebular/theme/styles/global/bootstrap/breakpoints';

@include nb-install-component() {
  display: flex;
  justify-content: space-between;
  width: 100%;

  .left {
    display: flex;
    width: 100%;
    order: 0;
    flex-direction: row;
  }
  .right {
    order: 1;
    flex-direction: row-reverse;
  }

  .logo-containter {
    display: flex;
    align-items: center;
  }

  .switcher-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 50%;
  }

  .control-item {
    display: block;
  }

  .header-container {
    display: flex;
    align-items: center;
    width: 100%;

    .navigation {
      padding-right: nb-theme(padding);
      font-size: 2.5rem;
    }

    .logo {
      padding: 0 nb-theme(padding);
      font-size: 1.75rem;
      font-weight: nb-theme(font-weight-bolder);
      border-left: 1px solid nb-theme(separator);

      span {
        font-weight: nb-theme(font-weight-normal);
      }
    }
  }

  .theme-switch {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    margin: 0;

    & > span {
      font-size: 1.125rem;
      font-weight: nb-theme(font-weight-bold);
      transition: opacity 0.3s ease;

      &.light {
        color: nb-theme(color-fg-text);
        padding-right: 10px;
      }

      &.cosmic {
        color: nb-theme(color-fg);
        padding-left: 10px;
      }

      @include nb-for-theme(cosmic) {
        &.light {
          color: nb-theme(color-fg);
        }

        &.cosmic {
          color: nb-theme(color-white);
        }
      }

      &:active {
        opacity: 0.78;
      }
    }
  }

  .switch {
    position: relative;
    display: inline-block;
    width: 4rem;
    height: 1.75rem;
    margin: 0;

    input {
      display: none;

      &:checked + .slider::before {
        transform: translateX(2.25rem);
      }
    }

    .slider {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      border-radius: 1.75rem;
      background-color: nb-theme(layout-bg);
    }

    .slider::before {
      position: absolute;
      content: '';
      height: 1.75rem;
      width: 1.75rem;
      border-radius: 50%;
      background-color: nb-theme(color-success);
      transition: 0.2s;

      box-shadow: 0 0 0.25rem 0 rgba(nb-theme(color-fg), 0.4);

      @include nb-for-theme(cosmic) {
        @include btn-hero-primary-gradient();
      }
    }
  }

  .toggle-layout /deep/ a {
    display: block;
    text-decoration: none;
    line-height: 1;

    i {
      color: nb-theme(color-success);
      font-size: 2.25rem;

      @include nb-for-theme(cosmic) {
        color: nb-theme(link-color);
      }
    }
  }

  @include media-breakpoint-down(md) {
    .control-item {
      display: none;
    }
  }

  @include media-breakpoint-down(sm) {

    nb-user /deep/ .user-name {
      display: none;
    }
  }

  @include media-breakpoint-down(is) {

    .header-container {
      .logo {
        font-size: 1.25rem;
      }
    }

    .toggle-layout {
      display: none;
    }

    .switcher-container {
      .light, .cosmic {
        display: none;
      }
    }
  }

  @include media-breakpoint-down(xs) {
    .right /deep/ {
      display: none;
    }

    .switcher-container {
      align-items: flex-end;
    }
  }
}