--border-radius: 12px;
  --border-radius-small: 8px;
  --border-radius-large: 16px;

  --shadow-small: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.2);

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  --transition: all 0.3s ease;
  }

  /* Sync indicator animation */
  @keyframes spin {
    0% {
      transform: rotate(0deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  .sync-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 16px;
    color: #666;
    transition: color 0.3s ease;
  }

  /* Dark Mode Variables */
  [data-theme="dark"] {
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --text-muted: #808080;

    --bg-primary: #1A1A1A;
    --bg-secondary: #2D2D2D;
    --bg-tertiary: #404040;
    --bg-overlay: rgba(0, 0, 0, 0.8);

    --border-color: #404040;
  }

  /* Editable Title Styles */
  .editable-title {
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--border-radius-small);
    padding: 2px 4px;
  }

  .editable-title:hover {
    background-color: var(--bg-tertiary);
  }

  /* Multi-View Layout */
  .multi-view-layout {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    min-height: calc(100vh - 160px);
  }

  .multi-view-layout .lists-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    align-content: start;
  }

  /* Filter Panel */
  .filter-panel {
    width: 280px;
    min-width: 280px;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-small);
    height: fit-content;
    position: sticky;
    top: 180px;
    transition: var(--transition);
  }

  .filter-panel.collapsed {
    width: 60px;
    min-width: 60px;
    overflow: hidden;
  }

  .filter-panel.collapsed .filter-content {
    display: none;
  }

  .filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
  }

  .filter-header h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
  }

  .collapse-btn {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-small);
    transition: var(--transition);
    color: var(--text-secondary);
  }

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

  .filter-content {
    padding: var(--spacing-md);
  }

  .filter-section {
    margin-bottom: var(--spacing-lg);
  }

  .filter-section:last-of-type {
    margin-bottom: var(--spacing-md);
  }

  .filter-section h5 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
  }

  .filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .filter-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    transition: var(--transition);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
  }

  .filter-checkbox:hover {
    background: var(--bg-tertiary);
  }

  .filter-checkbox input[type="checkbox"] {
    margin: 0;
    cursor: pointer;
    accent-color: var(--primary-color);
  }

  .filter-checkbox span {
    flex: 1;
    user-select: none;
  }

  .filter-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
  }

  .filter-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition);
  }

  .filter-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
  }

  /* Responsive Filter Panel */
  @media (max-width: 768px) {
    .multi-view-layout {
      flex-direction: column;
      gap: var(--spacing-md);
    }

    .filter-panel {
      width: 100%;
      min-width: auto;
      position: static;
      order: -1;
    }

    .filter-panel.collapsed {
      width: 100%;
    }

    .filter-panel.collapsed .filter-content {
      display: block;
      max-height: 0;
      overflow: hidden;
      padding: 0 var(--spacing-md);
      transition: max-height 0.3s ease, padding 0.3s ease;
    }

    .filter-panel:not(.collapsed) .filter-content {
      max-height: 500px;
    }
  }

  /* Reset and Base Styles */
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  /* Shopping App Container */
  .shopping-app {
    width: 100%;
    min-height: 100vh;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.6;
    padding-bottom: 80px;
    /* Space for quick add bar */
    padding-top: 60px;
    /* Space for navigation bar */
  }

  /* Shopping Header */
  .shopping-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-small);
  }

  /* Hide auth user-info on shopping pages to prevent conflicts */
  body:has(.shopping-app) #user-info {
    display: none !important;
  }

  /* Alternative: Move auth user-info to avoid conflict */
  body:has(.shopping-app) #user-info.authenticated {
    top: 80px !important;
    z-index: 150 !important;
  }

  .shopping-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
  }

  .header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
    min-width: 0;
  }

  .header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }

  /* View Switcher */
  .view-switcher {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs);
  }

  .view-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
  }

  .view-btn.active {
    background: var(--primary-color);
    color: white;
  }

  .view-btn:hover:not(.active) {
    background: var(--bg-primary);
    color: var(--text-primary);
  }

  /* Icon Buttons */
  .icon-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
  }

  .icon-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-small);
  }

  /* View Containers */
  .view-container {
    display: none;
    padding: var(--spacing-md);
  }

  .view-container.active {
    display: block;
  }

  /* Remove padding from multi-view container since layout handles it */
  #multi-view.view-container {
    padding: 0;
  }

  /* Multi-View Grid */
  .lists-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
  }

  /* List Cards */
  .list-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
  }

  .list-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
  }

  .list-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .list-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
  }

  .list-title h3 {
    flex: 1;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
  }

  .list-icon {
    font-size: var(--font-size-xl);
  }

  .list-actions {
    display: flex;
    gap: var(--spacing-xs);
  }

  .action-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .action-btn:hover {
    background: var(--primary-color);
    color: white;
  }

  .list-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .completion-badge {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: 600;
  }

  /* List Content */
  .list-content {
    padding: var(--spacing-lg);
  }

  .add-item-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
  }

  .add-item-input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
  }

  .add-item-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
  }

  .add-item-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .add-item-btn:hover {
    background: var(--success-color);
    transform: translateY(-1px);
  }

  /* Items List */
  .items-list {
    margin-bottom: var(--spacing-lg);
  }

  .list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    background: var(--bg-secondary);
    transition: var(--transition);
    border-left: 3px solid transparent;
  }

  .list-item:hover {
    background: var(--bg-tertiary);
    transform: translateX(2px);
  }

  .list-item.completed {
    opacity: 0.6;
    text-decoration: line-through;
  }

  .list-item.has-priority {
    border-left-color: var(--warning-color);
  }

  .item-checkbox {
    display: flex;
    align-items: center;
  }

  .item-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
  }

  .item-content {
    flex: 1;
    cursor: pointer;
    min-width: 0;
  }

  .item-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
  }

  .item-quantity {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 600;
  }

  .item-name {
    font-weight: 500;
  }

  .priority-indicator {
    font-size: var(--font-size-sm);
  }

  .item-meta {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
  }

  .item-actions {
    display: flex;
    gap: var(--spacing-xs);
  }

  .item-action-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
  }

  .list-item:hover .item-action-btn {
    opacity: 1;
  }

  .item-action-btn:hover {
    background: var(--danger-color);
    color: white;
  }

  .clear-completed-btn {
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
  }

  .clear-completed-btn:hover {
    background: var(--danger-color);
    color: white;
  }

  /* Single View */
  .single-view-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
  }

  .back-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    border: 1px solid var(--border-color);
  }

  .back-btn:hover {
    background: var(--primary-color);
    color: white;
  }

  #single-list-selector {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
  }

  /* Single List Container */
  .single-list {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-medium);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
  }

  .single-list-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    gap: var(--spacing-md);
  }

  .list-title-section h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
  }

  .list-progress {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }

  .progress-bar {
    width: 120px;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
  }

  .progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
  }

  .progress-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
  }

  .single-list-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
  }

  .single-add-item {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
  }

  .single-add-input {
    flex: 1;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
  }

  .single-add-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
  }

  .single-add-btn {
    padding: var(--spacing-lg) var(--spacing-xl);
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
  }

  .single-add-btn:hover {
    background: var(--success-color);
    transform: translateY(-1px);
  }

  /* Store Sections */
  .section-group {
    margin-bottom: var(--spacing-xl);
  }

  .section-header {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    padding: var(--spacing-md) 0;
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: var(--spacing-md);
  }

  /* Quick Add Bar */
  .quick-add-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    z-index: 200;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
  }

  .quick-add-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-sm);
  }

  #quick-add-input {
    flex: 1;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
  }

  #quick-add-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
  }

  .quick-add-btn {
    width: 56px;
    height: 56px;
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .quick-add-btn:hover {
    background: var(--success-color);
    transform: translateY(-2px);
  }

  /* Recent Items Popup */
  .recent-items-popup {
    position: fixed;
    bottom: 80px;
    left: var(--spacing-md);
    right: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-large);
    z-index: 300;
    max-height: 300px;
    overflow: hidden;
  }

  .recent-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    font-weight: 600;
  }

  .recent-header button {
    width: 24px;
    height: 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .recent-header button:hover {
    background: var(--danger-color);
    color: white;
  }

  .recent-items-list {
    max-height: 240px;
    overflow-y: auto;
  }

  .recent-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-color);
  }

  .recent-item:hover {
    background: var(--bg-secondary);
  }

  .recent-item:last-child {
    border-bottom: none;
  }

  .recent-text {
    flex: 1;
    font-weight: 500;
  }

  .recent-count {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
  }

  /* Modals */
  .modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
  }

  .modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-large);
  }

  .modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .modal-header h3 {
    margin: 0;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
  }

  .modal-header button {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
  }

  .modal-header button:hover {
    background: var(--danger-color);
    color: white;
  }

  .modal-body {
    padding: var(--spacing-lg);
  }

  .modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
  }

  /* Form Elements */
  .form-group {
    margin-bottom: var(--spacing-lg);
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }

  .form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
  }

  .form-group input,
  .form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
  }

  .form-group input:focus,
  .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
  }

  /* Buttons */
  .btn-primary {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
  }

  .btn-primary:hover {
    background: var(--success-color);
    transform: translateY(-1px);
  }

  .btn-secondary {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    background: transparent;
    color: var(--text-primary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
  }

  .btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
  }

  /* Options Menu */
  .options-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
  }

  .options-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-large);
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-large);
  }

  .options-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .options-body {
    padding: var(--spacing-lg);
  }

  .option-btn {
    width: 100%;
    padding: var(--spacing-lg);
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: var(--spacing-sm);
    text-align: left;
  }

  .option-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(4px);
  }

  .option-btn:last-child {
    margin-bottom: 0;
  }

  /* Empty States */
  .empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
  }

  .empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
  }

  .empty-state h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
  }

  .empty-state p {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
  }

  .empty-items {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-style: italic;
  }

  /* Dark Mode Specific Styles */
  .shopping-app.dark-mode {
    background: var(--bg-primary);
  }

  .shopping-app.dark-mode .list-card {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }

  .shopping-app.dark-mode .single-list {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }

  .shopping-app.dark-mode .modal-content {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  }

  /* Tablet Styles */
  @media (min-width: 768px) {
    .shopping-header {
      padding: var(--spacing-lg);
    }

    .view-switcher {
      display: inline-flex;
      width: auto;
    }

    .lists-grid {
      grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
      gap: var(--spacing-xl);
    }

    .quick-add-bar {
      padding: var(--spacing-lg);
    }

    .recent-items-popup {
      left: 50%;
      right: auto;
      transform: translateX(-50%);
      width: 500px;
    }

    .form-row {
      grid-template-columns: 1fr 1fr;
    }

    .single-view-header {
      flex-wrap: nowrap;
    }

    .single-list-header {
      align-items: center;
    }
  }

  /* Desktop Styles */
  @media (min-width: 1024px) {
    .shopping-app {
      padding-bottom: 0;
    }

    .quick-add-bar {
      position: relative;
      border-top: none;
      box-shadow: none;
      background: transparent;
      padding: var(--spacing-md) 0;
    }

    .lists-grid {
      grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }

    .recent-items-popup {
      bottom: auto;
      top: 100%;
      margin-top: var(--spacing-sm);
    }
  }

  /* Large Desktop Styles */
  @media (min-width: 1200px) {
    .shopping-header {
      padding: var(--spacing-xl) var(--spacing-lg);
    }

    .view-container {
      padding: var(--spacing-lg) var(--spacing-xl);
    }

    .lists-grid {
      grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    }
  }

  /* Accessibility */
  @media (prefers-reduced-motion: reduce) {
    * {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }

  /* High Contrast Mode */
  @media (prefers-contrast: high) {
    :root {
      --border-color: #000000;
      --text-secondary: #000000;
      --bg-secondary: #FFFFFF;
    }

    [data-theme="dark"] {
      --border-color: #FFFFFF;
      --text-secondary: #FFFFFF;
      --bg-secondary: #000000;
    }
  }

  /* Print Styles */
  @media print {

    .shopping-header,
    .quick-add-bar,
    .modal-overlay,
    .options-menu,
    .recent-items-popup {
      display: none !important;
    }

    .shopping-app {
      background: white !important;
      color: black !important;
    }

    .list-card {
      break-inside: avoid;
      box-shadow: none !important;
      border: 1px solid #000;
      margin-bottom: 1rem;
    }
  }