@layer components {
  /*
   * Navigation Menu - popup dialog
   *
   * Triggered by logo button in header
   * Uses native <dialog> element for proper focus management
   */

  /*
   * Menu trigger button - logo/brand that opens menu
   * Transparent by default, pill background on hover
   */
  .nav-trigger {
    display: inline-flex;
    align-items: center;
    gap: var(--inline-space-sm);
    padding: var(--block-space-sm) var(--inline-space);
    background: transparent;
    border: none;
    border-radius: 100px; /* pill shape */
    color: var(--color-ink);
    font-family: inherit;
    font-size: var(--text-lg);
    font-weight: 1000;
    line-height: inherit;
    cursor: pointer;
    transition: background-color 0.15s ease-out;
  }

  @media (any-hover: hover) {
    .nav-trigger:hover {
      background-color: var(--color-grey-200);
    }
  }

  .nav-trigger__logo {
    display: grid;
    place-content: center;
    font-size: 1.25em;
    color: var(--color-blue);
  }

  .nav-trigger__chevron {
    font-size: var(--text-xs);
    color: var(--color-ink-muted);
  }

  /* Keyboard hint - smaller to match button kbds, hidden on touch */
  .nav-trigger kbd {
    font-size: 0.65em;

    @media (any-hover: none) {
      display: none;
    }
  }

  /*
   * Menu dialog - popup panel
   * Positioned to overlap the header trigger
   */
  .nav-menu {
    position: fixed;
    inset-block-start: var(--block-space-sm);
    inset-inline-start: 50%;
    transform: translateX(-50%);
    max-block-size: calc(100dvh - var(--block-space-lg) * 2);
    inline-size: min(28rem, calc(100vw - var(--inline-space-lg) * 2));
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-canvas);
    box-shadow: 0 10px 40px oklch(0% 0 0 / 0.15), 0 2px 10px oklch(0% 0 0 / 0.1);
    overflow: hidden;
    z-index: var(--z-menu);
  }

  /* Dialog backdrop */
  .nav-menu::backdrop {
    background-color: oklch(0% 0 0 / 0.3);
  }

  /* Opening animation */
  .nav-menu[open] {
    animation: nav-menu-in 0.15s ease-out;
  }

  @keyframes nav-menu-in {
    from {
      opacity: 0;
      transform: translateX(-50%) translateY(-0.5rem);
    }
    to {
      opacity: 1;
      transform: translateX(-50%) translateY(0);
    }
  }

  /*
   * Menu header - close button for mobile
   */
  .nav-menu__header {
    display: none;
    align-items: center;
    justify-content: flex-end;
    padding: var(--block-space-sm) var(--inline-space);
    border-block-end: 1px solid var(--color-border);
  }

  @media (any-hover: none) {
    .nav-menu__header {
      display: flex;
    }
  }

  .nav-menu__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-ink-muted);
    cursor: pointer;
    font-size: var(--text-lg);
  }

  .nav-menu__close:hover {
    background-color: var(--color-grey-200);
    color: var(--color-ink);
  }

  /*
   * Menu content - scrollable
   */
  .nav-menu__content {
    overflow-x: hidden;
    overflow-y: auto;
    max-block-size: calc(100dvh - 6rem);
    padding: var(--block-space) var(--inline-space-lg);
    padding-block-end: var(--block-space-sm);
  }

  /*
   * Quick access buttons - row of prominent nav buttons
   */
  .nav-quick-access {
    display: flex;
    gap: var(--inline-space-lg);
    padding-block: var(--block-space);
    padding-block-end: var(--block-space-lg);
    border-block-end: 1px solid var(--color-border);
    margin-block-end: var(--block-space-sm);
  }

  .nav-quick-access__btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--block-space-sm);
    padding: var(--block-space-lg) var(--inline-space);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-canvas);
    color: var(--color-ink);
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.1s ease-out, border-color 0.1s ease-out;
    position: relative;
  }

  .nav-quick-access__btn:hover {
    background-color: var(--color-grey-300);
  }

  .nav-quick-access__btn.is-active {
    border-color: oklch(75% 0.12 255); /* light blue border */
    border-width: 2px;
    padding: calc(var(--block-space-lg) - 1px) calc(var(--inline-space) - 1px); /* compensate for thicker border */
  }

  .nav-quick-access__icon {
    font-size: var(--text-2xl);
    color: var(--color-ink);
  }

  .nav-quick-access__label {
    font-size: var(--text-base);
    font-weight: 600;
  }

  .nav-quick-access__hotkey {
    position: absolute;
    inset-block-start: var(--block-space-sm);
    inset-inline-end: var(--block-space-sm);
    padding: 0.15em 0.4em;
    background-color: var(--color-canvas-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-family: var(--font-family-mono);
    color: var(--color-ink-muted);
  }

  /* Hide hotkeys on touch devices */
  @media (any-hover: none) {
    .nav-quick-access__hotkey {
      display: none;
    }
  }

  /* Mobile: smaller quick access buttons */
  @media (max-width: 640px) {
    .nav-quick-access {
      gap: var(--inline-space);
    }

    .nav-quick-access__btn {
      padding: var(--block-space) var(--inline-space-sm);
    }

    .nav-quick-access__btn.is-active {
      padding: calc(var(--block-space) - 1px) calc(var(--inline-space-sm) - 1px);
    }

    .nav-quick-access__icon {
      font-size: var(--text-xl);
    }

    .nav-quick-access__label {
      font-size: var(--text-sm);
    }
  }

  /*
   * Menu sections
   */
  .nav-section {
    padding-block: var(--block-space-xs);
  }

  .nav-section__title {
    padding: var(--block-space-sm) var(--inline-space);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-muted);
  }

  /*
   * Menu items
   */
  .nav-item {
    display: flex;
    align-items: center;
    gap: var(--inline-space-lg);
    padding: var(--block-space-xs) var(--inline-space);
    margin-inline: calc(var(--inline-space) * -1);
    border-radius: var(--radius-md);
    color: var(--color-ink);
    text-decoration: none;
    font-size: var(--text-lg);
    cursor: pointer;
    transition: background-color 0.1s ease-out;
  }

  .nav-item:hover {
    background-color: var(--color-grey-300);
  }

  .nav-item.is-active {
    background-color: var(--color-grey-200);
    font-weight: 600;
  }

  .nav-item__icon {
    flex-shrink: 0;
    inline-size: 1.5rem;
    text-align: center;
    color: var(--color-ink-muted);
  }

  .nav-item.is-active .nav-item__icon {
    color: var(--color-ink);
  }

  .nav-item__text {
    flex: 1;
    min-inline-size: 0;
  }

  /* Hotkey numbers for quick access */
  .nav-item__hotkey {
    font-size: var(--text-xs);
    font-family: var(--font-family-mono);
    color: var(--color-ink-faint);
    padding: 0.1em 0.4em;
    background-color: var(--color-canvas-alt);
    border-radius: var(--radius-sm);
  }

  /*
   * Collapsible sections (using <details>)
   */
  .nav-section details {
    margin-inline: calc(var(--inline-space-lg) * -1);
    border-block-start: 1px solid var(--color-border);
  }

  .nav-section details:first-child {
    border-block-start: none;
  }

  .nav-section summary {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--inline-space);
    padding: var(--block-space) var(--inline-space-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-ink-muted);
    cursor: pointer;
    list-style: none;
  }

  .nav-section summary::-webkit-details-marker {
    display: none;
  }

  .nav-section summary::before {
    content: "";
    border: solid var(--color-ink-muted);
    border-width: 0 2px 2px 0;
    padding: 4px;
    transform: rotate(-45deg);
    transition: transform 0.15s ease-out;
  }

  .nav-section details[open] summary::before {
    transform: rotate(45deg) translateY(-2px);
  }

  .nav-section__items {
    padding-inline: var(--inline-space-lg);
  }
}