/**
 * RenDS Menubar
 * Horizontal menu bar component (File, Edit, View, etc.)
 *
 * Implements WAI-ARIA Menubar pattern with keyboard navigation,
 * roving focus, submenu support, and checkbox/radio items.
 *
 * Classes:
 * - .ren-menubar: Root horizontal menu bar
 * - .ren-menubar-trigger: Top-level menu button
 * - .ren-menubar-menu: Dropdown menu panel
 * - .ren-menubar-item: Individual menu item
 * - .ren-menubar-separator: Divider between item groups
 * - .ren-menubar-shortcut: Keyboard shortcut indicator
 * - .ren-menubar-label: Non-interactive group label
 * - .ren-menubar-submenu: Submenu with chevron
 * - .ren-menubar-checkbox: Checkbox menu item
 * - .ren-menubar-radio: Radio menu item
 */

/* =================================================================
   ROOT MENUBAR
   ================================================================= */

.ren-menubar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

/* =================================================================
   MENUBAR TRIGGER (Top-level Menu Button)
   ================================================================= */

.ren-menubar-trigger {
  position: relative;
  padding: var(--space-1) var(--space-2);
  background-color: transparent;
  color: var(--color-text);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--body-size);
  font-weight: var(--label-weight);
  cursor: pointer;
  transition: background-color var(--duration-tactile) var(--ease-enter);
  white-space: nowrap;
}

.ren-menubar-trigger:hover:not([aria-expanded="true"]) {
  background-color: var(--color-fill-hover);
}

.ren-menubar-trigger[aria-expanded="true"] {
  background-color: var(--color-fill-active);
  color: var(--color-text);
}

.ren-menubar-trigger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.ren-menubar-trigger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* =================================================================
   MENUBAR MENU (Dropdown Panel)
   ================================================================= */

.ren-menubar-menu {
  position: absolute;
  top: 100%;
  inset-inline-start: 0;
  margin-top: var(--space-1);
  min-width: 200px;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Visible state for menu open */
.ren-menubar-menu:not([hidden]) {
  display: flex;
  animation: menubar-menu-open var(--duration-exit) var(--ease-enter);
}

/* Hidden state for menu closed */
.ren-menubar-menu[hidden] {
  display: none;
  animation: menubar-menu-close var(--duration-exit) var(--ease-enter);
}

@starting-style {
  .ren-menubar-menu:not([hidden]) {
    opacity: 0;
    transform: translateY(-4px);
  }
}

@keyframes menubar-menu-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes menubar-menu-close {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-4px);
  }
}

/* =================================================================
   MENUBAR ITEM (Menu Item)
   ================================================================= */

.ren-menubar-item {
  display: flex;
  align-items: center;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background-color: transparent;
  color: var(--color-text);
  border: none;
  font-size: var(--body-size);
  font-weight: normal;
  text-align: start;
  cursor: pointer;
  transition: background-color var(--duration-tactile) var(--ease-enter);
  position: relative;
  gap: var(--space-2);
}

.ren-menubar-item:hover:not([data-disabled]) {
  background-color: var(--color-fill-hover);
}

.ren-menubar-item:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.ren-menubar-item[data-disabled] {
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.ren-menubar-item[data-disabled]:hover {
  background-color: transparent;
}

/* =================================================================
   MENUBAR SHORTCUT (Keyboard Shortcut Indicator)
   ================================================================= */

.ren-menubar-shortcut {
  display: inline-block;
  margin-inline-start: auto;
  padding-inline-start: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--caption-size);
  font-family: monospace;
  flex-shrink: 0;
}

/* =================================================================
   MENUBAR SEPARATOR (Divider)
   ================================================================= */

.ren-menubar-separator {
  height: 1px;
  background-color: var(--color-separator);
  margin: var(--space-1) 0;
}

/* =================================================================
   MENUBAR LABEL (Group Label)
   ================================================================= */

.ren-menubar-label {
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--label-size);
  font-weight: var(--label-weight);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  user-select: none;
  pointer-events: none;
}

/* =================================================================
   MENUBAR SUBMENU (With Chevron)
   ================================================================= */

.ren-menubar-submenu {
  position: relative;
}

/* Chevron indicator via ::after */
.ren-menubar-submenu::after {
  content: '›';
  display: inline-block;
  margin-inline-start: auto;
  padding-inline-start: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--body-size);
  flex-shrink: 0;
}

/* Submenu panel positioning (higher z-index for layering) */
.ren-menubar-submenu > .ren-menubar-menu {
  top: 0;
  inset-inline-start: calc(100% + var(--space-1));
  margin-top: 0;
  z-index: 1100;
}

/* =================================================================
   MENUBAR CHECKBOX (Checkbox Menu Item)
   ================================================================= */

.ren-menubar-checkbox {
  position: relative;
}

/* Checkmark via ::before */
.ren-menubar-checkbox::before {
  content: '';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  margin-inline-end: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: transparent;
  flex-shrink: 0;
}

.ren-menubar-checkbox[aria-checked="true"]::before {
  content: '✓';
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-on-accent);
  font-size: 0.75em;
  font-weight: bold;
}

/* =================================================================
   MENUBAR RADIO (Radio Menu Item)
   ================================================================= */

.ren-menubar-radio {
  position: relative;
}

/* Radio indicator via ::before */
.ren-menubar-radio::before {
  content: '';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  margin-inline-end: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background-color: transparent;
  flex-shrink: 0;
}

.ren-menubar-radio[aria-checked="true"]::before {
  content: '';
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: inset 0 0 0 2px var(--color-surface-raised);
}

/* =================================================================
   ACCESSIBILITY & INTERACTION STATES
   ================================================================= */

/* Hover fill for interactive items */
.ren-menubar-item:not([data-disabled]):not(.ren-menubar-label) {
  user-select: none;
}

/* Focus management for submenus */
.ren-menubar-menu [role="menuitem"]:focus-visible,
.ren-menubar-menu [role="menuitemcheckbox"]:focus-visible,
.ren-menubar-menu [role="menuitemradio"]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

/* Ensure disabled items don't respond to pointer events */
.ren-menubar-item[data-disabled] {
  pointer-events: none;
}

/* Active/selected state */
.ren-menubar-item.is-focused {
  background-color: var(--color-fill-hover);
}

/* =================================================================
   MEDIA QUERIES & RESPONSIVE
   ================================================================= */

@media (prefers-reduced-motion: reduce) {
  .ren-menubar-trigger,
  .ren-menubar-item,
  .ren-menubar-menu {
    transition: none;
    animation: none;
  }
}