/*
 * Header
 *
 * Measured from Figma `Header` (69:335). Four Device variants, two axes:
 *
 *   Desktop        56 tall, padding  8 / 64, end-slot gap 12
 *   Tablet         56 tall, padding  8 / 24, end-slot gap  8
 *   Mobile-Closed  64 tall, padding 12 / 16, toggle only
 *   Mobile-Open    as Mobile-Closed, plus the dropped Menu-Container
 *
 * WHY DEVICE IS A MEDIA QUERY AND OPEN IS A PROP
 *
 * Device is the one variant axis in the whole system the browser already knows
 * the answer to. Every other component takes its variant from the caller
 * because the caller is the only one who knows; a header is Mobile because the
 * viewport is narrow, and asking React to duplicate that is how the two get out
 * of step. Breakpoints match the Breakpoint collection's own container widths —
 * Tablet below 1216, Mobile below 896.
 *
 * Open/Closed is the opposite: nothing in CSS knows it, so it is a prop, and it
 * arrives here as `[data-open]`.
 *
 * Note the header is taller on Mobile (64) than on Desktop and Tablet (56).
 * That looks inverted but is deliberate in the design: touch targets need the
 * height more than the desktop pointer does.
 *
 * ONE TREE, TWO LAYOUTS
 *
 * `__menu` is `display: contents` above the mobile breakpoint, so `__center`
 * and `__end` are flex items of the bar itself; below it, the same element
 * becomes the absolutely positioned Menu-Container. The slots are therefore
 * rendered once, never duplicated across breakpoints.
 */
.ion-header {
  /* Desktop is the base; the two narrower breakpoints override downward, so a
   * new rung is added in one place rather than three. */
  --ion-header-height: calc(var(--spacing-48) + var(--spacing-8)); /* 56 */
  --ion-header-padding-y: var(--spacing-8);
  --ion-header-padding-x: var(--spacing-64);
  --ion-header-center-gap: var(--spacing-8);
  --ion-header-end-gap: var(--spacing-12);

  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-8);
  width: 100%;
  min-height: var(--ion-header-height);
  padding: var(--ion-header-padding-y) var(--ion-header-padding-x);
  background-color: var(--surface-default);

  /*
   * A bottom rule only. Figma reports the stroke weight as mixed because just
   * the bottom edge carries one, which is exactly what a header divider is.
   */
  border-bottom: var(--border-width-default) solid var(--border-default);
  font-family: var(--font-family-sans);
}

@media (width < 1216px) {
  .ion-header {
    --ion-header-padding-x: var(--spacing-24);
    --ion-header-end-gap: var(--spacing-8);
  }
}

@media (width < 896px) {
  .ion-header {
    --ion-header-height: var(--spacing-64);
    --ion-header-padding-y: var(--spacing-12);
    --ion-header-padding-x: var(--spacing-16);
  }
}

.ion-header__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  flex-shrink: 0;
  color: var(--icon-default);
}

/*
 * Above the mobile breakpoint the wrapper contributes no box of its own — its
 * two children are laid out by the bar. `display: contents` is what makes the
 * single-tree approach possible; without it the slots would need to be either
 * duplicated or moved by script.
 */
.ion-header__menu {
  display: contents;
}

.ion-header__center {
  display: flex;
  align-items: center;
  gap: var(--ion-header-center-gap);
  min-width: 0;
}

.ion-header__end {
  display: flex;
  align-items: center;
  gap: var(--ion-header-end-gap);
  flex-shrink: 0;
}

/*
 * The Mobile-Closed / Mobile-Open toggle. Figma builds it from the Icon Button
 * component (Secondary, Small, Square) but the Header owns the instance, so the
 * geometry is stated here rather than reached for across components: 32 square,
 * radius/sm, 16px icon.
 */
.ion-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: var(--spacing-32);
  height: var(--spacing-32);
  padding: 0;
  color: var(--icon-default);
  background-color: var(--surface-default);
  border: var(--border-width-default) solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--ion-shadow-raised-lifted-xs);
  cursor: pointer;
}

.ion-header__toggle > svg {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
}

.ion-header__toggle:focus-visible {
  outline: var(--border-width-thick) solid var(--ring-focus);
  outline-offset: var(--spacing-2);
}

@media (width < 896px) {
  .ion-header__toggle {
    display: inline-flex;
  }

  /*
   * Menu-Container. Figma places it at y=67 against a 64-tall bar — a 3px nudge
   * that is on no scale and matches no token, so it is anchored flush to the
   * bar's bottom edge instead. Nothing else in the design depends on the gap.
   */
  .ion-header__menu {
    position: absolute;
    top: 100%;
    inset-inline-start: 0;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-12);
    width: 100%;
    padding: var(--spacing-12) var(--spacing-8);
    background-color: var(--surface-default);
    border: var(--border-width-default) solid var(--border-default);
    border-radius: var(--radius-md);
  }

  .ion-header[data-open] .ion-header__menu {
    display: flex;
  }

  .ion-header:not([data-open]) .ion-header__menu {
    display: none;
  }

  /* Both slots stack full width inside the panel; the end slot keeps its row
   * but shares the width evenly, as the two buttons do in Figma. */
  .ion-header__center {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .ion-header__end {
    width: 100%;
  }

  .ion-header__end > * {
    flex: 1 1 0;
  }
}

/*
 * menuType="dialog": the toggle opens the caller's Drawer, so there is no
 * panel. The slots keep their bar layout below the breakpoint, and the end
 * slot is pushed to the far edge because the toggle now leads.
 */
@media (width < 896px) {
  .ion-header.ion-header--dialog-menu .ion-header__menu {
    display: contents;
  }

  .ion-header--dialog-menu .ion-header__center {
    flex-direction: row;
    align-items: center;
    width: auto;
  }

  .ion-header--dialog-menu .ion-header__end {
    width: auto;
    margin-inline-start: auto;
  }

  .ion-header--dialog-menu .ion-header__end > * {
    flex: none;
  }
}

/*
 * Forced-colors: box-shadow is dropped by the OS, so the toggle would lose its
 * only edge. A border in ButtonText keeps it visible.
 */
@media (forced-colors: active) {
  .ion-header__toggle {
    border-color: ButtonText;
  }
}