FixIt/assets/scss/core/layouts/_header.scss

@use "core/functions" as *;
@use "core/mixins" as *;
@use "variables" as *;

$header-box-shadow: 0 0 1.5rem 0 light-dark(rgba(0, 0, 0, 0.125), rgba(255, 255, 255, 0.125));

header {
  width: 100%;
  transition: box-shadow 0.3s ease;
  background-color: fi-var(header-background-color);
  @include z-index(fixed);

  &:hover {
    box-shadow: $header-box-shadow;
  }

  @include scroll-state-query('scroller', 'scroll-state(scrollable: top)') {
    box-shadow: $header-box-shadow;
  }

  &.is-blur {
    @include scroll-state-query('scroller', 'scroll-state(scrollable: top)', '&') {
      background-color: transparent;
      backdrop-filter: saturate(1.2) blur(10px);
      background-size: 4px 4px;
      background-image: radial-gradient(transparent 1px, fi-var(header-background-color) 1px);
    }
  }

  &.animate__animated.header__fadeInDown {
    animation-name: #{$prefix}header-fade-in-down;
  }

  &.animate__animated.header__fadeOutUp {
    animation-name: #{$prefix}header-fade-out-up;
  }

  @include media('print') {
    display: none !important;
  }
}

@keyframes #{$prefix}header-fade-in-down {
  from {
    translate: 0 -100% 0;
    visibility: visible;
  }

  to {
    translate: 0 0 0;
  }
}

@keyframes #{$prefix}header-fade-out-up {
  from {
    translate: 0 0 0;
  }

  to {
    visibility: hidden;
    translate: 0 -100% 0;
  }
}

.header-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  box-sizing: border-box;
  width: 100%;
}

.header-title {
  font-size: fi-var(header-title-font-size);
  font-family: fi-var(header-title-font-family);
  font-weight: bold;
  line-height: 1;
  padding: 0.25rem;
  min-width: 10%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  flex: 10;
  display: flex;
  align-items: flex-end;
  gap: 0.25rem;

  .header-title-link {
    display: flex;
    align-items: center;
    gap: 0.25rem;

    // recommended size: 32px * 32px
    .logo {
      height: 32px;
      width: auto;
    }
  }

  .header-subtitle {
    font-size: 0.75rem;
    line-height: fi-var(header-title-font-size);
  }
}

.menu {
  margin: 0;
  padding: 0;

  .menu-item-divider {
    list-style: none;
    margin: 0.25rem 0.5rem;
    height: 1px;
    background-color: fi-var(menu-border-color);
  }

  .menu-item {
    list-style: none;

    .dropdown-icon {
      margin-left: 0.25rem;
      font-size: .875em;
      color: fi-var(global-font-color);

      &.open::before {
        content: "\f078";
      }
    }

    &.active {
      >.menu-link,
      >.nested-item>.menu-link {
        font-weight: bold;
        color: fi-var(menu-active-color);
      }
    }

    .menu-link[href="javascript:void(0);"] {
      color: inherit;
    }

    .menu-link i {
      transform: perspective(1rem);
      transition: transform 0.4s ease;
    }

    .menu-link:hover i {
      transform: perspective(1rem) translateZ(0.2rem);
    }
  }
}

.theme-switch {
  position: relative;
  @include focus-visible-ring;

  i {
    display: inline-block;
    rotate: 225deg;
    scale: 1;
    transform-origin: center;
    @include theme-switch-mode('auto');
    @include theme-switch-mode('light', '\f185');
    @include theme-switch-mode('dark', '\f186');

    @include media('reduce-motion') {
      animation: none !important;
    }
  }

  @include theme-switch-keyframes('auto', 180deg, 0.9, 0.7, 60%, 245deg, 1.08);
  @include theme-switch-keyframes('light', 140deg, 0.82, 0.55, 55%, 250deg, 1.12);
  @include theme-switch-keyframes('dark', 310deg, 0.86, 0.55, 55%, 205deg, 1.08);
}

#header-desktop {
  display: block;
  position: sticky;
  top: 0;
  height: fi-var(header-height);
  line-height: fi-var(header-height);
  box-sizing: border-box;

  [data-header-desktop='normal'] & {
    position: static;
  }

  nav {
    overflow: hidden;
    white-space: nowrap;
  }

  .header-wrapper {
    padding: 0 2rem;
    height: 100%;

    &[data-github-corner='left'] {
      padding-inline-start: fi-var(header-height);
    }
    &[data-github-corner='right'] {
      padding-inline-end: fi-var(header-height);
    }

    .menu {
      display: flex;
      flex-direction: row;
      flex-wrap: nowrap;

      > .menu-item {
        &:hover .sub-menu {
          display: block;
          translate: -0.5rem 0;
        }
        &.language-switch:hover .sub-menu {
          translate: calc(2.25rem - 100%) 0;
        }
      }

      .menu-item {
        padding: 0 0.5rem;

        &.search {
          display: flex;
          align-items: center;
        }

        &.delimiter {
          width: 0;
          margin: 18.5px 0.5rem;
          padding: 0;
          border-left: 1.5px solid fi-var(global-border-color);
        }
      }

      .sub-menu {
        position: absolute;
        margin: 0;
        padding: 0.25rem 0;
        display: none;
        top: calc(#{fi-var(header-height)} - 0.75rem);
        border: 1px solid fi-var(menu-border-color);
        background-color: fi-var(header-background-color);
        max-height: 60vh;
        overflow-y: auto;
        overscroll-behavior: contain;
        transition: box-shadow 0.3s ease;
        @include border-radius;
        box-shadow: 0 0 1.5rem 0 light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.1));

        .menu-item {
          height: fi-var(submenu-height);
          line-height: fi-var(submenu-height);
          max-width: 15rem;
          white-space: nowrap;
          text-overflow: ellipsis;
          overflow-x: hidden;
        }
      }
    }

    @include media('md', 'down') {
      padding-inline: 1rem;
    }
  }

  .search-trigger {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    border: 1px solid fi-var(global-border-color-light);
    background-color: fi-var(search-background-color);
    color: fi-var(global-font-tertiary-color);
    white-space: nowrap;
    font-size: 0.875rem;
    transition: color 0.2s, border-color 0.2s;
    @include border-radius(0.5rem);

    &:hover {
      color: fi-var(global-font-color);
      border-color: fi-var(global-border-color);
    }

    kbd {
      padding: 0.0625rem 0.375rem;
      font-family: inherit;
      font-size: 0.6875rem;
      line-height: 1.5;
      background-color: light-dark(#dfe1e4, #353b45);
      border: 1px solid fi-var(global-border-color);
      @include border-radius(0.25rem);

      &::after {
        content: 'Ctrl K';
      }
    }

    [data-platform='mac'] & kbd::after {
      content: '⌘ K';
    }
  }

  @include media('xs') {
    display: none;
  }
}

#header-mobile {
  position: sticky;
  top: 0;
  height: fi-var(header-height);
  line-height: fi-var(header-height);

  [data-header-mobile='normal'] & {
    position: static;
  }

  .header-container {
    padding: 0;
    margin: 0;
    height: fi-var(header-height);
    position: relative;

    .header-wrapper {
      height: 100%;
      padding: 0 1rem;
      font-size: 1.125rem;
      transition: margin-top 0.3s ease;

      .header-title {
        max-width: 80%;
      }

      .search-trigger {
        position: relative;
        @include focus-visible-ring;
      }

      .search-trigger,
      .theme-switch {
        line-height: 1.25em;
      }

      .menu-toggle {
        position: relative;
        @include focus-visible-ring;

        span {
          display: block;
          background-color: fi-var(global-font-color);
          width: 20px;
          height: 2px;
          transition: all 0.3s ease-in-out;
          @include border-radius(full);
        }

        span:not(:last-child) {
          margin-bottom: 6px;
        }

        &.active {
          span:nth-child(1) {
            translate: 0 8px;
            rotate: 45deg;
          }

          span:nth-child(2) {
            opacity: 0;
          }

          span:nth-child(3) {
            translate: 0 -8px;
            rotate: -45deg;
          }
        }
      }
    }

    .menu {
      background-color: fi-var(header-background-color);
      border-top: 2px solid fi-var(global-border-color-light);
      display: none;
      overflow-y: auto;
      overscroll-behavior: contain;
      max-height: 70vh;
      box-shadow: 0 0.125rem 0.25rem light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.1));
      @include scrollbar-width(none, 0);

      .search-wrapper {
        display: flex;
        justify-content: space-between;
        align-items: center;
        box-sizing: border-box;
        padding: 0.5rem 1rem;
        position: sticky;
        top: 0;
        background-color: fi-var(header-background-color);
        @include z-index(sticky);
      }

      .menu-item {
        display: block;
        position: relative;
        line-height: 2.5rem;
        padding: 0 1rem;

        &:not(.menu-system):hover {
          background-color: light-dark(#f2f2f3, #535355);
        }

        .menu-link {
          display: block;
          white-space: nowrap;
          text-overflow: ellipsis;
          overflow-x: hidden;
          flex: 4;
        }

        & .nested-item {
          display: flex;
          justify-content: space-between;
          align-items: center;

          .menu-link {
            max-width: 80%;
          }
        }
      }

      .menu-system {
        display: flex;
        justify-content: center;
        gap: 0.25rem;
        position: sticky;
        bottom: 0;
        line-height: 2.5rem;
        padding: 0 1rem;
        background-color: fi-var(header-background-color);

        .menu-system-item {
          padding-inline: 0.5rem;
        }

        .language-switch {
          position: relative;

          .language-select {
            position: absolute;
            opacity: 0;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
          }
        }
      }

      .sub-menu {
        padding-left: 0;
        display: none;

        &.open {
          display: block;
        }

        .menu-item:hover {
          background-color: light-dark(#e7e7ea, #5d5d5f);
        }
      }

      &.active {
        display: block;
      }
    }
  }

  &.open {
    .header-wrapper {
      margin-top: calc(#{fi-var(header-height)} * -1);
    }

    .menu {
      padding-top: 0;
      border-top: none;

      .menu-item {
        display: none;
      }
    }
  }

  @include media('sm', 'up') {
    display: none;
  }
}