@layer components {
  /* ==========================================================================
     Admin Layout Shell
     ========================================================================== */

  .admin-layout {
    display: flex;
    height: 100dvh;
    overflow: hidden;
  }

  /* ==========================================================================
     Sidebar
     ========================================================================== */

  .admin-sidebar {
    width: var(--sidebar-width);
    background: var(--color-ink);
    color: var(--color-ink-inverted);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
  }

  .admin-sidebar__logo {
    padding: var(--block-space);
    font-size: var(--text-title-1);
    font-weight: 700;
    color: var(--color-ink-inverted);
    text-decoration: none;
  }

  .admin-sidebar__nav {
    flex: 1;
    padding: var(--block-space) 0;
  }

  .admin-sidebar__section {
    padding: var(--block-space-half) var(--block-space);
    font-size: var(--text-caption);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-caps);
    color: var(--color-ink-inverted-50);
    margin-top: var(--block-space);
  }

  .admin-sidebar__link {
    display: block;
    padding: var(--block-space-half) var(--block-space);
    color: var(--color-ink-inverted-80);
    text-decoration: none;
    border-bottom: none;
    transition: all 150ms ease;

    &:hover {
      background: var(--color-ink-inverted-10);
      color: var(--color-ink-inverted);
      text-decoration: none;
      border-bottom: none;
    }

    &.active {
      background: var(--color-ink-inverted-15);
      color: var(--color-ink-inverted);
    }
  }

  .admin-sidebar__footer {
    padding: var(--block-space);
    border-top: 1px solid var(--color-ink-inverted-10);
    font-size: var(--text-footnote);
    color: var(--color-ink-inverted-50);

    form {
      margin-top: var(--block-space-half);
    }

    .btn--plain {
      --btn-color: var(--color-ink-inverted-50);
      font-size: var(--text-footnote);

      &:hover {
        --btn-color: var(--color-ink-inverted);
      }
    }
  }

  /* Mobile sidebar (hidden by default) */
  .admin-sidebar__close {
    display: none;
  }

  .admin-overlay {
    display: none;
  }

  /* ==========================================================================
     Main Content Area
     ========================================================================== */

  .admin-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-canvas);
    overflow: hidden;
    min-width: 0;
  }

  .admin-header {
    background: var(--color-canvas);
    border-bottom: 1px solid var(--color-border);
    padding: var(--block-space) var(--block-space-double);
    display: flex;
    align-items: center;
    gap: var(--inline-space);
  }

  .admin-header__toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--block-space-quarter);
    cursor: pointer;
    color: var(--color-ink);
  }

  .admin-header__title {
    font-size: var(--text-title-3);
    font-weight: 600;
    flex: 1;
  }

  .admin-header__actions {
    display: flex;
    align-items: center;
    gap: var(--inline-space-half);

    .btn {
      font-size: var(--text-footnote);
      --btn-padding: 0.5em 0.75em;
    }
  }

  .admin-content {
    flex: 1;
    padding: var(--block-space-double);
    overflow-y: auto;
  }

  /* ==========================================================================
     Page-specific components
     ========================================================================== */

  /* Subscriber header with count */
  .subscriber-header {
    display: flex;
    align-items: center;
    gap: var(--inline-space);

    &__count {
      font-size: var(--text-body);
      font-weight: 600;
      margin: 0;
    }
  }

  /* Email preview iframe */
  .email-preview {
    width: 100%;
    min-height: var(--email-preview-height);
    border: none;
    display: block;
  }

  /* Code block (for showing API keys, etc) */
  .code-block {
    background: var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--block-space);
    font-size: var(--text-footnote);
    line-height: 1.5;
    margin: 0;

    code {
      font-family: var(--font-mono);
      white-space: pre-wrap;
      word-break: break-word;
    }
  }

  @media (max-width: 800px) {
    .subscriber-header {
      flex-wrap: wrap;
    }
  }

  /* ==========================================================================
     Mobile Layout (max-width: 800px)
     ========================================================================== */

  @media (max-width: 800px) {
    .admin-layout {
      display: block;
      overflow-x: hidden;
    }

    .admin-main {
      width: 100%;
    }

    .admin-header__toggle {
      display: block;
    }

    /* Slide-out sidebar */
    .admin-sidebar {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      z-index: var(--z-dropdown);
      transform: translateX(-100%);
      transition: transform 200ms ease;
    }

    #admin-sidebar-toggle:checked ~ .admin-layout .admin-sidebar {
      transform: translateX(0);
    }

    .admin-sidebar__close {
      display: block;
      position: absolute;
      top: var(--block-space);
      right: var(--block-space);
      background: none;
      border: none;
      color: var(--color-ink-inverted-60);
      cursor: pointer;
      padding: var(--block-space-quarter);

      &:hover {
        color: var(--color-ink-inverted);
      }
    }

    /* Overlay behind sidebar */
    .admin-overlay {
      position: fixed;
      inset: 0;
      background: var(--color-overlay);
      z-index: calc(var(--z-dropdown) - 1);
      opacity: 0;
      visibility: hidden;
      transition: opacity 200ms ease, visibility 200ms ease;
      cursor: pointer;
    }

    #admin-sidebar-toggle:checked ~ .admin-layout .admin-overlay {
      display: block;
      opacity: 1;
      visibility: visible;
    }

    /* Prevent body scroll when sidebar open */
    #admin-sidebar-toggle:checked ~ .admin-layout {
      overflow: hidden;
      height: 100vh;
    }

    /* Compact header */
    .admin-header {
      padding: var(--block-space);
      flex-wrap: wrap;
    }

    .admin-header__title {
      flex: 1;
      min-width: 0;
    }

    .admin-header__actions {
      flex-shrink: 0;
    }

    .admin-content {
      padding: var(--block-space);
    }
  }
}