/* ==========================================================================
   GridMaster - Responsive Layout & Mobile Interaction System
   ========================================================================== */

/* Mobile Bottom Navigation Bar */
.mobile-bottom-nav,
.mobile-nav-bar {
  display: none;
  height: var(--mobile-nav-height);
  background: var(--bg-panel);
  border-top: 1px solid var(--border-subtle);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 60;
  justify-content: space-around;
  align-items: center;
  padding: 0 4px;
}

.mobile-nav-item {
  flex: 1;
  height: 100%;
  background: transparent;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition-fast), background var(--transition-fast);
  min-height: 44px;
  border-radius: var(--radius-sm);
}

.mobile-nav-item.active {
  color: var(--accent-primary);
  background: var(--accent-subtle);
}

.mobile-nav-item svg {
  width: 20px;
  height: 20px;
}

.mobile-drawer-close {
  display: none;
}

/* Mobile Drawer Backdrop */
.mobile-drawer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(26, 24, 22, 0.45);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 65;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.mobile-drawer-backdrop.is-active {
  display: block;
  opacity: 1;
  pointer-events: auto;
}

/* Tablet & Mobile Breakpoints (<= 880px) */
@media (max-width: 880px) {
  .app-header {
    padding: 0 12px;
  }
  
  /* Make header center tools icon-only on mobile so undo/redo remain accessible */
  .header-center-tools {
    display: flex;
    gap: 4px;
  }

  .header-center-tools .tool-btn {
    padding: 6px;
    min-height: 36px;
    min-width: 36px;
  }

  .header-center-tools .tool-btn span {
    display: none;
  }

  /* Root Mobile Scroll Architecture: Single Natural Document Scroll */
  html, body {
    height: auto !important;
    min-height: 100% !important;
    overflow-x: hidden !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
  }

  #app {
    height: auto !important;
    min-height: 100vh !important;
    min-height: 100dvh !important;
    overflow: visible !important;
  }

  /* Header on Mobile: Normal document flow, NO sticky, NO fixed */
  .app-header {
    position: relative !important;
    top: auto !important;
    z-index: 20;
    flex-shrink: 0;
  }

  .app-body {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    height: auto !important;
    min-height: fit-content !important;
    max-height: none !important;
    margin-bottom: 0 !important;
    overflow: visible !important;
    position: relative !important;
  }

  /* 1. Workspace / Image Canvas: Normal flow, directly at top of body */
  .workspace-container {
    position: relative !important;
    top: auto !important;
    width: 100% !important;
    height: auto !important;
    min-height: 500px !important;
    max-height: none !important;
    flex-shrink: 0;
    background: var(--bg-workspace);
    border-bottom: 2px solid var(--border-medium);
    box-shadow: none !important;
    overflow: visible !important;
    z-index: 5;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 20px 14px !important;
    box-sizing: border-box !important;
  }

  /* When NO image is loaded: Canvas is zero-dimension offscreen so it never takes space or overlaps */
  body:not(.has-image) #drawing-canvas,
  .workspace-container:not(.has-image) #drawing-canvas {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    opacity: 0 !important;
    pointer-events: none !important;
    visibility: hidden !important;
    top: 0 !important;
    left: 0 !important;
    z-index: -1 !important;
  }

  /* When image is loaded into canvas */
  body.has-image .workspace-container,
  .workspace-container.has-image {
    height: 440px !important;
    min-height: 320px !important;
    max-height: 60vh !important;
    overflow: hidden !important;
    padding: 8px !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
  }

  body.has-image #drawing-canvas,
  .workspace-container.has-image #drawing-canvas {
    position: relative !important;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
    display: block !important;
    max-width: 100% !important;
    z-index: 2 !important;
  }

  body.has-image .empty-state-overlay,
  .workspace-container.has-image .empty-state-overlay,
  .empty-state-overlay.hidden,
  .empty-state-overlay[style*="display: none"] {
    display: none !important;
  }

  /* Hide mobile drawer backdrop & legacy navigation overlays */
  .mobile-drawer-backdrop,
  .mobile-bottom-nav,
  .mobile-nav-bar,
  .mobile-category-nav,
  .mobile-drawer-close,
  .sidebar-header {
    display: none !important;
  }

  /* Controls Panel: In normal document flow, directly under the image workspace */
  .sidebar-controls {
    position: static !important;
    transform: none !important;
    width: 100% !important;
    height: auto !important;
    min-height: fit-content !important;
    max-height: none !important;
    overflow: visible !important;
    border-left: none !important;
    border-top: 1px solid var(--border-medium) !important;
    border-bottom: 2px solid var(--border-medium) !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    z-index: 5 !important;
    display: flex !important;
    flex-direction: column !important;
    background: var(--bg-panel);
    padding: 0 0 32px 0 !important;
    margin: 0 !important;
    box-sizing: border-box !important;
  }

  /* 2. Action Buttons (sidebar-footer): DIRECTLY UNDER THE IMAGE (order: 1) */
  .sidebar-footer {
    order: 1 !important;
    position: static !important;
    top: auto !important;
    bottom: auto !important;
    width: 100% !important;
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 10px !important;
    padding: 14px 16px !important;
    background: var(--bg-panel-elevated) !important;
    border-top: none !important;
    border-bottom: 1px solid var(--border-medium) !important;
    box-sizing: border-box !important;
    box-shadow: var(--shadow-sm) !important;
    z-index: 2;
  }

  .sidebar-footer .btn {
    flex: 1 !important;
    min-height: 44px !important;
    padding: 8px 12px !important;
    font-size: 13px !important;
    font-weight: 600 !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 6px !important;
  }

  /* 3. Settings Accordions (sidebar-scrollable): DIRECTLY AFTER THE BUTTONS (order: 2) */
  .sidebar-scrollable {
    order: 2 !important;
    position: static !important;
    top: auto !important;
    flex: 0 0 auto !important;
    width: 100% !important;
    height: auto !important;
    min-height: fit-content !important;
    max-height: none !important;
    overflow: visible !important;
    padding: 18px 16px 28px 16px !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 14px !important;
    scrollbar-width: none !important;
    margin: 0 !important;
    box-sizing: border-box !important;
  }

  .sidebar-scrollable::-webkit-scrollbar {
    display: none !important;
    width: 0 !important;
    height: 0 !important;
  }

  /* All accordion items visible as neat stacked cards with generous space */
  .sidebar-controls .accordion-item {
    display: block !important;
    width: 100% !important;
    border: 1px solid var(--border-medium) !important;
    border-radius: var(--radius-md) !important;
    background: var(--bg-panel-elevated) !important;
    overflow: visible !important;
    margin: 0 !important;
    box-shadow: var(--shadow-sm);
    box-sizing: border-box !important;
  }

  /* Accordion Header: Clean tap target */
  .sidebar-controls .accordion-trigger {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    width: 100% !important;
    padding: 16px 18px !important;
    min-height: 52px !important;
    background: var(--bg-panel-elevated) !important;
    border: none !important;
    cursor: pointer !important;
    font-size: 13px !important;
    font-weight: 700 !important;
    letter-spacing: 0.05em !important;
    text-transform: uppercase !important;
    color: var(--text-primary) !important;
    user-select: none !important;
    border-radius: var(--radius-md) !important;
    box-sizing: border-box !important;
  }

  .sidebar-controls .accordion-item.is-open .accordion-trigger {
    border-bottom-left-radius: 0 !important;
    border-bottom-right-radius: 0 !important;
  }

  .sidebar-controls .accordion-trigger:hover,
  .sidebar-controls .accordion-trigger:active {
    background: var(--bg-panel-hover) !important;
  }

  /* Accordion Content: Hidden unless is-open */
  .sidebar-controls .accordion-content {
    display: none !important;
    padding: 18px 16px !important;
    background: var(--bg-panel) !important;
    border-top: 1px solid var(--border-subtle) !important;
    gap: 16px !important;
    height: auto !important;
    overflow: visible !important;
    box-sizing: border-box !important;
  }

  .sidebar-controls .accordion-item.is-open .accordion-content {
    display: flex !important;
    flex-direction: column !important;
    height: auto !important;
    overflow: visible !important;
  }

  /* Workspace HUD Position: float cleanly above bottom of workspace */
  .workspace-hud {
    bottom: 12px;
    z-index: 25;
    padding: 3px 8px;
    box-shadow: var(--shadow-floating);
  }

  .workspace-hud.hidden {
    display: none !important;
  }

  .hud-btn {
    width: 36px;
    height: 36px;
  }

  /* Toast Container positioning */
  .toast-container {
    bottom: 24px;
    left: 16px;
    right: 16px;
    align-items: center;
    z-index: 80;
  }

  /* Empty State on Mobile: Spacious card with generous dropzone without clipping */
  .empty-state-overlay {
    position: relative !important;
    inset: auto !important;
    width: 100% !important;
    max-width: 500px !important;
    height: auto !important;
    min-height: 0 !important;
    padding: 0 !important;
    margin: 0 auto !important;
    overflow: visible !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    background: transparent !important;
    z-index: 10 !important;
  }

  .empty-state-overlay.hidden,
  .empty-state-overlay[style*="display: none"] {
    display: none !important;
  }

  .empty-state-card {
    padding: 24px 18px !important;
    max-width: 100% !important;
    width: 100% !important;
    max-height: none !important;
    height: auto !important;
    overflow: visible !important;
    box-sizing: border-box !important;
    box-shadow: var(--shadow-sm) !important;
    border: 1px solid var(--border-medium) !important;
    border-radius: var(--radius-lg) !important;
    background: var(--bg-panel) !important;
    position: relative !important;
    z-index: 15 !important;
    margin: 0 auto !important;
    text-align: center !important;
  }

  .empty-state-card::-webkit-scrollbar {
    display: none !important;
  }

  .empty-state-icon {
    width: 48px !important;
    height: 48px !important;
    margin: 0 auto 10px !important;
  }

  .empty-state-title {
    font-size: 20px !important;
    margin-bottom: 4px !important;
  }

  .empty-state-subtitle {
    font-size: 13px !important;
    margin-bottom: 16px !important;
    line-height: 1.4 !important;
  }

  .dropzone-box {
    width: 100% !important;
    min-height: 150px !important;
    padding: 24px 16px !important;
    margin-bottom: 16px !important;
    border: 2px dashed var(--border-strong) !important;
    border-radius: var(--radius-md) !important;
    background: var(--bg-app) !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 12px !important;
    box-sizing: border-box !important;
  }

  .dropzone-box:hover,
  .dropzone-box:active {
    border-color: var(--accent-primary) !important;
    background: var(--bg-panel-hover) !important;
  }

  .dropzone-cta-btn {
    padding: 10px 24px !important;
    font-size: 14px !important;
    min-height: 44px !important;
    font-weight: 600 !important;
    width: auto !important;
  }

  .dropzone-text {
    font-size: 12px !important;
    color: var(--text-secondary) !important;
    margin: 0 !important;
    text-align: center !important;
  }

  .empty-state-alternatives {
    margin-top: 14px !important;
    padding-top: 14px !important;
    border-top: 1px solid var(--border-subtle) !important;
    width: 100% !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    gap: 10px !important;
    position: relative !important;
    z-index: 20 !important;
  }

  .alt-action-link {
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
    padding: 8px 16px !important;
    min-height: 38px !important;
    background: var(--bg-panel-hover) !important;
    border: 1px solid var(--border-medium) !important;
    border-radius: var(--radius-sm) !important;
    color: var(--text-primary) !important;
    font-weight: 600 !important;
    font-size: 13px !important;
    cursor: pointer !important;
    touch-action: manipulation !important;
    position: relative !important;
    z-index: 25 !important;
  }

  .alt-action-link:hover,
  .alt-action-link:active {
    background: var(--accent-subtle) !important;
    color: var(--accent-primary) !important;
    border-color: var(--accent-primary) !important;
  }

  .sample-pills {
    display: flex !important;
    flex-wrap: wrap !important;
    justify-content: center !important;
    gap: 6px !important;
  }

  .sample-pill-btn {
    padding: 6px 12px !important;
    font-size: 12px !important;
    min-height: 32px !important;
    touch-action: manipulation !important;
  }

  .sample-row {
    flex-wrap: wrap !important;
    justify-content: center !important;
    gap: 6px !important;
  }

  .sample-btn {
    padding: 6px 12px !important;
    font-size: 12px !important;
    min-height: 32px !important;
  }

  /* Crop Modal Header on Mobile */
  .crop-header-bar {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "title actions"
      "ratios ratios";
    gap: 8px 12px;
    padding: 10px 14px 8px 14px;
    height: auto;
    min-height: 84px;
    max-height: none;
    flex-wrap: unset;
    border-bottom: 1px solid var(--border-medium);
  }

  .crop-bar-title {
    grid-area: title;
    align-self: center;
    font-size: 16px;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .crop-actions {
    grid-area: actions;
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .crop-actions .btn {
    min-height: 36px;
    padding: 6px 12px;
    font-size: 12px;
  }

  .crop-ratio-selector,
  .crop-aspect-buttons {
    grid-area: ratios;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 2px 2px 6px 2px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
  }

  .crop-ratio-selector::-webkit-scrollbar,
  .crop-aspect-buttons::-webkit-scrollbar {
    display: none;
  }

  .crop-ratio-btn,
  .crop-aspect-btn {
    flex-shrink: 0;
    white-space: nowrap;
    padding: 6px 12px;
    font-size: 12px;
    border-radius: var(--radius-pill);
    min-height: 34px;
    line-height: 1.2;
  }

  .crop-canvas-wrapper,
  .crop-stage {
    padding: 8px;
  }

  #crop-canvas {
    max-width: 98%;
    max-height: 98%;
  }

  /* Fullscreen Preview on Mobile: Hide bottom nav */
  body.is-preview-mode .mobile-bottom-nav,
  body.is-preview-mode .mobile-nav-bar {
    display: none !important;
  }

  body.is-preview-mode .app-body {
    margin-bottom: 0 !important;
    height: 100dvh !important;
    max-height: 100dvh !important;
  }

  /* Touch Target Enhancement */
  button, .btn, .hud-btn, .color-swatch-btn, .tool-btn {
    min-height: 40px;
  }

  .crop-ratio-btn,
  button.crop-ratio-btn {
    min-height: 32px !important;
  }

  .crop-actions .btn {
    min-height: 34px !important;
  }
}

@media (max-width: 480px) {
  .crop-header-bar {
    padding: 8px 10px 6px 10px;
    min-height: 78px;
    gap: 6px 8px;
  }

  .crop-bar-title {
    font-size: 15px;
  }

  .crop-bar-title svg {
    width: 16px;
    height: 16px;
  }

  .crop-actions .btn {
    padding: 5px 8px;
    font-size: 11px;
    min-height: 32px !important;
  }

  .crop-ratio-btn,
  button.crop-ratio-btn {
    padding: 4px 10px;
    font-size: 11px;
    min-height: 30px !important;
  }

  .brand-title {
    font-size: 16px;
  }

  .brand-title .brand-badge {
    display: none;
  }
  
  .header-actions .btn-secondary {
    display: none;
  }

  .header-actions .btn-primary {
    padding: 6px 10px;
    font-size: 12px;
  }
}