/* src/layout/Header.css */

.app-header {
  display: flex;
  align-items: center;
  height: var(--header-height, 40px);
  /* No outer horizontal padding: the leading burger button and the
   * trailing right-panel toggle each occupy a full --icon-column-width
   * slot, so they sit at the same X coordinates as the ribbon column
   * (left) and the right panel's icon strip (right). This holds even
   * when the ribbon is hidden — the burger's slot is laid out by the
   * header itself, not by the ribbon's presence. */
  padding: 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  gap: 0;
  flex-shrink: 0;
}

@media (display-mode: standalone) {
  .app-header {
    height: calc(var(--header-height, 40px) + env(safe-area-inset-top, 0px));
    padding-top: env(safe-area-inset-top, 0px);
    box-sizing: border-box;
  }
}

.header-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  /* Match the icon column metric so the burger button is horizontally
   * centered at the same X as ribbon icons / side-tab icons. Fills
   * the full header height so the hover/active fill is flush with
   * the header band — no top/bottom gap. */
  width: var(--icon-column-width);
  height: 100%;
  background: none;
  border: none;
  /* Square corners — matches the rectilinear chrome (ribbon, side-tab
   * strip, file-tree rows, tab bar). */
  border-radius: 0;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.15s, background-color 0.15s;
  flex-shrink: 0;
}

.header-toggle-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.header-toggle-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.header-toggle-btn svg {
  /* Match ribbon icon size so the burger button sits in the same
   * icon column as ribbon icons and reads as the same visual weight. */
  width: 20px;
  height: 20px;
}

.header-title {
  flex: 1;
  min-width: 0;
  /* The header has zero outer padding so the burger / right-toggle
   * buttons span the full --icon-column-width. Add inline padding to
   * the title so the "Reams" text doesn't sit flush against the
   * burger button. */
  padding: 0 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  user-select: none;
  -webkit-user-select: none;
}

.header-update-btn {
  flex-shrink: 0;
  margin-right: var(--ui-space-2);
  min-height: 32px;
  padding: 4px 10px;
}
.header-update-btn:disabled { cursor: wait; }
.header-update-error { color: var(--error); font-size: 0.75rem; max-width: 12rem; }

.header-mode-toggle {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  background: none;
  border: 1px solid var(--border-color);
  /* Square corners — matches the rectilinear chrome. */
  border-radius: 0;
  padding: 0.2rem 0.5rem;
  /* The header has zero outer padding (see .app-header); add a small
   * right margin so the mode toggle pill doesn't sit flush against the
   * right-panel toggle button next to it. */
  margin-right: 0.5rem;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background-color 0.15s;
  user-select: none;
  flex-shrink: 0;
}

.header-mode-toggle:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
  background-color: var(--bg-tertiary);
}

.header-mode-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.header-mode-toggle svg {
  width: 14px;
  height: 14px;
}

.header-mode-label {
  font-size: 0.75rem;
}

.header-mode-shortcut {
  color: var(--text-tertiary);
  font-size: 0.65rem;
  margin-left: 0.25rem;
}