// stylelint-disable max-nesting-depth
// stylelint-disable primer/spacing
// stylelint-disable primer/borders

.AppFrame {

  // AppFrame structure
  // ===================
  //
  // .AppFrame
  // ├─ .AppFrame-a11yNav
  // │  ├─ .AppFrame-a11yLink
  // │
  // ├─ .AppFrame-main
  // │  ├─ .AppFrame-header-wrapper
  // │  │   ├─ .AppFrame-header
  // │  │   ├─ .AppFrame-subheader
  // │  │
  // │  ├─ #start-of-content
  // │  ├─ .AppFrame-body
  // │
  // │  .AppFrame-footer

  // Accessibility navigation

  .AppFrame-a11yNav {
    position: absolute;
    z-index: 1000;
    display: flex;
    width: 100%;
    padding: var(--base-size-16, 16px);
    background: var(--bgColor-inset, var(--color-canvas-inset));
    padding-block-end: calc(var(--base-size-16, 16px) - var(--borderWidth-thin, 1px));
    isolation: isolate;
    align-items: center;
    gap: var(--base-size-8, 8px);

    &:not(:focus-within) {
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(1px, 1px, 1px, 1px);
      border: 0;
    }

    &:focus-within {
      top: 0;
      left: 0;

      // Narrow viewport
      @media (max-width: #{map-get($breakpoints, 'md') - 0.02px}) {
        justify-content: center;
      }
    }
  }

  .AppFrame-a11yLink {
    transition: none;

    &:not(:focus) {
      display: block;
      width: var(--base-size-8, 8px);
      height: var(--base-size-8, 8px);
      overflow: hidden;
      text-indent: var(--base-size-128, 128px);
      pointer-events: none;
      background: var(--borderColor-default, var(--color-border-default));
      border-radius: var(--borderRadius-full, 100vh);
    }

    &:focus {
      z-index: 20;
      display: grid;
      width: auto;
      height: auto;
      min-height: var(--control-medium-size, 32px);
      padding: 0 var(--control-medium-paddingInline-spacious, 16px);
      overflow: auto;
      color: var(--fgColor-onEmphasis, var(--color-fg-on-emphasis));
      background: var(--bgColor-accent-emphasis, var(--color-accent-emphasis));
      border-radius: var(--borderRadius-full, 100vh);
      align-items: center;

      @media (pointer: coarse) {
        &::after {
          @include minTouchTarget(var(--control-minTarget-coarse, 44px));
        }
      }

      @media (prefers-reduced-motion: no-preference) {
        animation: AppFrame-a11yLink-focus 200ms ease-out;
      }

      @keyframes AppFrame-a11yLink-focus {
        0% {
          color: var(--fgColor-accent, var(--color-accent-emphasis));
          transform: scale(0.3, 0.25);
        }

        50% {
          color: var(--fgColor-accent, var(--color-accent-emphasis));
          transform: scale(1, 1);
        }

        55% {
          color: var(--fgColor-onEmphasis, var(--color-fg-on-emphasis));
        }

        100% {
          transform: scaleX(1);
        }
      }
    }
  }

  .AppFrame-main {
    display: flex;
    min-height: 100vh;
    flex-direction: column;

    @supports (height: 100dvh) {
      min-height: 100dvh;
    }
  }

  .AppFrame-header-wrapper {
    position: relative;
    height: min-content;
    overflow: visible;

    .AppFrame-header {
      position: sticky;
      top: 0;
      z-index: 1;
    }
  }

  .AppFrame-header {
    flex: 0 0 auto;
  }

  .AppFrame-subheader {
    flex: 0 0 auto;
  }

  .AppFrame-body {
    flex: 1 0;
    height: 100%;
  }

  .AppFrame-footer {
    flex: 0 0 auto;
  }
}