/*
 * Split Container Layout
 * ======================
 * tmux-like split panel system with resizable dividers.
 * Uses design tokens from: terminal/_tokens.css
 */

/* ========================================
 * Split Layout Wrapper
 * ======================================== */

.split-layout-wrapper {
  display: flex;
  flex: 1;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
}

.split-layout-container {
  display: flex;
  flex: 1;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
}

/* ========================================
 * Split Container
 * ======================================== */

.split-container {
  display: flex;
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.split-container.split-horizontal {
  flex-direction: row;
}

.split-container.split-vertical {
  flex-direction: column;
}

/* Zoomed state - hide siblings */
.split-container--zoomed .split-child:not(:has(.split-panel--zoomed)) {
  display: none;
}

.split-container--zoomed .split-divider {
  display: none;
}

/* ========================================
 * Split Child (wrapper for panel or nested split)
 * ======================================== */

.split-child {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  transition: flex var(--transition-resize);
}

/* ========================================
 * Split Divider
 * ======================================== */

.split-divider {
  flex-shrink: 0;
  background: var(--color-border-default);
  transition: background var(--transition-fast);
  position: relative;
  z-index: var(--z-dropdown);
}

/* Horizontal split = vertical divider (|) */
.split-horizontal > .split-divider {
  width: var(--split-divider-size);
  height: 100%;
  cursor: col-resize;
}

/* Vertical split = horizontal divider (—) */
.split-vertical > .split-divider {
  width: 100%;
  height: var(--split-divider-size);
  cursor: row-resize;
}

/* Hover state */
.split-divider:hover {
  background: var(--split-divider-hover-color);
}

/* Dragging state */
.split-divider--dragging {
  background: var(--color-accent-primary);
}

/* Grab handle removed for flat UI */

/* Body state during drag */
body.split-dragging {
  cursor: col-resize !important;
  user-select: none !important;
}

body.split-dragging * {
  cursor: inherit !important;
}

/* ========================================
 * Split Panel
 * ======================================== */

.split-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  min-height: 0;
  background: var(--color-bg-primary);
  overflow: hidden;
}

/* Active/focused panel - subtle indicator only */
.split-panel--active {
  background: var(--color-bg-secondary);
}

/* Zoomed panel */
.split-panel--zoomed {
  position: fixed !important;
  top: var(--status-bar-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-modal);
  border-radius: 0;
  border: none;
}

/* ========================================
 * Panel Header
 * ======================================== */

.split-panel__header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: transparent;
  flex-shrink: 0;
  min-height: 24px;
}

.split-panel__icon {
  font-size: var(--font-size-sm);
  line-height: 1;
}

.split-panel__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex: 1;
}

/* Focused panel header highlight */
.split-panel--active .split-panel__header {
  background: color-mix(in srgb, var(--color-accent-primary) 10%, var(--color-bg-secondary));
}

.split-panel--active .split-panel__title {
  color: var(--color-accent-primary);
}

/* ========================================
 * Panel Actions
 * ======================================== */

.split-panel__actions {
  display: flex;
  gap: var(--space-1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.split-panel:hover .split-panel__actions,
.split-panel--active .split-panel__actions {
  opacity: 1;
}

.split-panel__action {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.split-panel__action:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.split-panel__action--close:hover {
  background: var(--color-accent-error);
  color: white;
}

/* ========================================
 * Panel Content
 * ======================================== */

.split-panel__content {
  flex: 1;
  overflow: auto;
  min-height: 0;
}

.split-panel__content::-webkit-scrollbar {
  width: var(--scrollbar-width);
  height: var(--scrollbar-width);
}

.split-panel__content::-webkit-scrollbar-track {
  background: var(--scrollbar-track-color);
}

.split-panel__content::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb-color);
  border-radius: var(--radius-md);
}

.split-panel__content::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover-color);
}

/* ========================================
 * Prefix Indicator
 * ======================================== */

.split-prefix-indicator {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-accent-primary);
  border-radius: var(--radius-md);
  color: var(--color-accent-primary);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: var(--z-notification);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.split-prefix-indicator.active {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
 * Empty Panel Placeholder
 * ======================================== */

.split-panel__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--space-6);
  color: var(--color-text-muted);
  text-align: center;
}

.split-panel__placeholder-icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
  opacity: 0.3;
}

.split-panel__placeholder-text {
  font-size: var(--font-size-sm);
}

/* ========================================
 * Responsive Adjustments
 * ======================================== */

@media (max-width: 768px) {
  .split-panel__header {
    padding: var(--space-1);
  }

  .split-panel__title {
    font-size: 10px;
  }

  .split-panel__action {
    width: 16px;
    height: 16px;
    font-size: 10px;
  }
}

/* ========================================
 * Reduced Motion
 * ======================================== */

@media (prefers-reduced-motion: reduce) {
  .split-child {
    transition: none;
  }

  .split-panel,
  .split-divider,
  .split-prefix-indicator {
    transition: none;
  }
}

/* ========================================
 * Split Notification (Bug 1.2 Fix)
 * ======================================== */

.split-notification {
  position: fixed;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-accent-warning, #f59e0b);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  opacity: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: var(--z-notification);
  box-shadow: var(--shadow-lg);
  max-width: 90vw;
  text-align: center;
}

.split-notification.active {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Touch-friendly dividers on mobile/tablet */
@media (max-width: 768px) {
  .split-horizontal > .split-divider {
    width: 12px;  /* Wider for touch accuracy (was 4px) */
  }

  .split-vertical > .split-divider {
    height: 12px;  /* Taller for touch accuracy (was 4px) */
  }

  /* Always show grab handle on touch devices */
  .split-divider::after {
    opacity: 0.6;  /* Always visible on mobile */
  }

  .split-divider:active::after {
    opacity: 1;
  }

  /* Increase panel action button size for touch */
  .split-panel__action {
    width: 44px;   /* WCAG minimum (was 18px) */
    height: 44px;
  }
}

/* ========================================
 * Panel Dropdown Menu
 * ======================================== */

.panel-dropdown {
  position: relative;
}

.split-panel__dropdown-trigger {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.split-panel__dropdown-trigger:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.split-panel__dropdown-trigger:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.panel-dropdown__menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 180px;
  padding: var(--space-1) 0;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0, 0, 0, 0.3);
  z-index: var(--z-dropdown, 1000);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast),
              visibility var(--transition-fast);
}

.panel-dropdown__menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.panel-dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  min-height: 36px;
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-family: var(--font-mono);
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.panel-dropdown__item:hover {
  background: rgba(97, 175, 239, 0.1);
  color: var(--color-text-primary);
}

.panel-dropdown__item--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.panel-dropdown__item--disabled:hover {
  background: transparent;
  color: var(--color-text-secondary);
}

.panel-dropdown__item--has-submenu {
  position: relative;
}

.panel-dropdown__icon {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.panel-dropdown__chevron {
  margin-left: auto;
  color: var(--color-text-muted);
}

.panel-dropdown__divider {
  height: 1px;
  margin: var(--space-1) 0;
  background: var(--color-border-subtle);
}

/* Submenu container */
.panel-dropdown__submenu-container {
  position: relative;
}

.panel-dropdown__submenu {
  position: absolute;
  top: 0;
  left: 100%;
  min-width: 160px;
  max-height: 500px; /* Increased from 300px to show all workshop panels */
  overflow-y: auto;
  padding: var(--space-1) 0;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: calc(var(--z-dropdown, 1000) + 1);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-4px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast),
              visibility var(--transition-fast);
}

.panel-dropdown__submenu.open {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

/* Keep submenu open when hovering */
.panel-dropdown__submenu-container:hover .panel-dropdown__submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

/* Flip submenu to left if near right edge */
.split-panel:last-child .panel-dropdown__submenu,
.panel-dropdown--flip-submenu .panel-dropdown__submenu {
  left: auto;
  right: 100%;
  transform: translateX(4px);
}

.split-panel:last-child .panel-dropdown__submenu.open,
.panel-dropdown--flip-submenu .panel-dropdown__submenu.open,
.split-panel:last-child .panel-dropdown__submenu-container:hover .panel-dropdown__submenu,
.panel-dropdown--flip-submenu .panel-dropdown__submenu-container:hover .panel-dropdown__submenu {
  transform: translateX(0);
}

/* Protected panel indicator */
.split-panel--protected .split-panel__header {
  border-left: 2px solid var(--color-accent-warning, #f59e0b);
}

/* Scrollbar styling for submenu */
.panel-dropdown__submenu::-webkit-scrollbar {
  width: 6px;
}

.panel-dropdown__submenu::-webkit-scrollbar-track {
  background: transparent;
}

.panel-dropdown__submenu::-webkit-scrollbar-thumb {
  background: var(--color-border-default);
  border-radius: 3px;
}

.panel-dropdown__submenu::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-subtle);
}

/* Mobile: larger tap targets */
@media (max-width: 768px) {
  .split-panel__dropdown-trigger {
    width: 44px;
    height: 44px;
  }

  .panel-dropdown__item {
    min-height: 44px;
  }

  .panel-dropdown__menu {
    min-width: 200px;
  }

  /* Stack submenus below parent on mobile */
  .panel-dropdown__submenu {
    position: relative;
    left: 0;
    right: auto;
    margin-left: var(--space-3);
    border: none;
    box-shadow: none;
    max-height: none;
  }

  .panel-dropdown__submenu.open {
    transform: none;
  }
}

/* ========================================
 * Single Panel Mode (Mobile/Tablet)
 * Shows one panel at a time with switcher
 * ======================================== */

/* Mobile Panel Switcher - always available */
.mobile-panel-switcher {
  display: none;  /* Hidden by default, shown via JS when in mobile mode */
  gap: var(--space-1);
  padding: var(--space-2);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-default);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex-shrink: 0;
  position: relative;  /* For pseudo-element positioning */
}

.mobile-panel-switcher::-webkit-scrollbar {
  display: none;
}

/* Gradient fade to indicate scrollability */
.mobile-panel-switcher::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 40px;
  background: linear-gradient(
    to right,
    transparent,
    var(--color-bg-secondary)
  );
  pointer-events: none;  /* Don't block clicks */
  opacity: 0;  /* Hidden by default */
  transition: opacity var(--transition-fast);
}

/* Show gradient when content overflows */
.mobile-panel-switcher.has-overflow::after {
  opacity: 1;
}

.mobile-panel-switcher__btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  min-height: 44px;  /* WCAG touch target */
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;  /* Prevent text selection on tap */
  -webkit-user-select: none;  /* Safari/iOS */
  -webkit-tap-highlight-color: transparent;  /* Remove tap highlight flash */
}

.mobile-panel-switcher__btn:hover {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
}

.mobile-panel-switcher__btn.active {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  color: var(--color-bg-primary);
}

.mobile-panel-switcher__btn:active {
  transform: scale(0.98);
}

.mobile-panel-switcher__btn:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

.mobile-panel-switcher__icon {
  font-size: var(--font-size-base);
}

/* Mobile: Compact panel switcher tabs */
@media (max-width: 768px) {
  .mobile-panel-switcher {
    padding: 4px 8px;
    gap: 4px;
  }

  .mobile-panel-switcher__btn {
    min-height: 36px;  /* Reduced from 44px */
    padding: 4px 8px;
    font-size: 12px;
  }
}

/* When mobile mode is active */
.split-layout-wrapper.mobile-mode {
  flex-direction: column;
}

.split-layout-wrapper.mobile-mode .mobile-panel-switcher {
  display: flex;
}

.split-layout-wrapper.mobile-mode .split-layout-container {
  flex: 1;
  min-height: 0;
}

/* Hide all panels except the active one in mobile mode */
.split-layout-wrapper.mobile-mode .split-child {
  display: none;
}

.split-layout-wrapper.mobile-mode .split-child.mobile-active {
  display: flex;
  flex: 1;
}

/* Hide dividers in mobile mode */
.split-layout-wrapper.mobile-mode .split-divider {
  display: none;
}

/* Tablet breakpoint - enable mobile mode by default */
@media (max-width: 1024px) {
  .split-layout-wrapper.auto-mobile-mode .mobile-panel-switcher {
    display: flex;
  }

  .split-layout-wrapper.auto-mobile-mode .split-child {
    display: none;
  }

  .split-layout-wrapper.auto-mobile-mode .split-child.mobile-active {
    display: flex;
    flex: 1;
  }

  .split-layout-wrapper.auto-mobile-mode .split-divider {
    display: none;
  }
}

/* Force desktop mode to always hide the switcher */
@media (min-width: 1025px) {
  .mobile-panel-switcher {
    display: none !important;
  }

  .split-layout-wrapper .split-child {
    display: flex !important;
  }

  .split-layout-wrapper .split-divider {
    display: block !important;
  }
}