:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Color Palette - Modern Dark Theme by default */
  --bg-app: #0b0f19;
  --bg-surface: #111827;
  --bg-surface-elevated: #1f2937;
  --bg-card: #1e293b;
  --bg-input: #0f172a;
  --border: #334155;
  --border-focus: #3b82f6;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: rgba(59, 130, 246, 0.15);
  
  --success: #10b981;
  --success-light: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
  
  --sidebar-width: 290px;
  --header-height: 60px;
  --bottom-bar-height: 64px;
}

[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-card: #ffffff;
  --bg-input: #f8fafc;
  --border: #e2e8f0;
  --border-focus: #2563eb;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  height: 100vh;
  height: 100dvh;
  display: flex;
  overflow: hidden;
  user-select: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 0.95rem;
  color: inherit;
}

/* App Container Layout */
#app {
  display: flex;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  position: relative;
}

/* Sidebar (Desktop/Tablet) */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 20;
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.sidebar-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.list-section {
  flex: 1;
  overflow-y: auto;
  padding: 12px 10px;
}

.section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  color: var(--text-dim);
  padding: 8px 12px 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.list-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  margin-bottom: 4px;
  border-radius: var(--radius-md);
  cursor: pointer;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: background-color 0.15s ease;
}

.list-nav-item:hover {
  background-color: var(--bg-surface-elevated);
}

.list-nav-item.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.list-nav-left {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.list-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.list-nav-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.list-nav-count {
  font-size: 0.8rem;
  background-color: var(--bg-surface-elevated);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

.list-nav-item.active .list-nav-count {
  background-color: var(--primary);
  color: #ffffff;
}

.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
}

.btn-sidebar-footer {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.btn-sidebar-footer:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-main);
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  background-color: var(--bg-app);
}

/* Header */
.top-header {
  height: var(--header-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.btn-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.current-list-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.current-list-title {
  font-size: 1.25rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Status Pill */
.status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background-color: var(--bg-surface-elevated);
  cursor: pointer;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-dot.online { background-color: var(--success); }
.status-dot.syncing { background-color: var(--primary); animation: pulse 1s infinite; }
.status-dot.offline { background-color: var(--text-dim); }
.status-dot.error { background-color: var(--danger); }

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.6; }
}

/* Action Bar & Quick Add */
.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

/* Progress bar */
.progress-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.progress-track {
  height: 6px;
  background-color: var(--bg-surface-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* Item Quick Add Box */
.quick-add-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px 14px;
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s;
}

.quick-add-box:focus-within {
  border-color: var(--border-focus);
}

.input-item-name {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 1rem;
}

.input-item-qty {
  width: 60px;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  text-align: center;
  outline: none;
}

.select-category {
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  outline: none;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-add-item {
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  padding: 6px 14px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.15s;
}

.btn-add-item:hover {
  background-color: var(--primary-hover);
}

/* List Filter / Search bar */
.list-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  max-width: 320px;
}

.search-input {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 8px 14px 8px 34px;
  font-size: 0.88rem;
  outline: none;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

.filter-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-subtle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.btn-subtle:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-main);
}

/* Category Groups and Items */
.items-container {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-bottom: 80px;
}

.category-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.category-group-header {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.item-row {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: transform 0.15s, border-color 0.15s, opacity 0.2s;
}

.item-row:hover {
  border-color: #475569;
}

.item-row.checked {
  opacity: 0.6;
  background-color: var(--bg-surface);
}

.item-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

/* Custom Large Checkbox (Finger friendly) */
.custom-checkbox {
  width: 26px;
  height: 26px;
  border: 2px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-surface-elevated);
  flex-shrink: 0;
  cursor: pointer;
  transition: all 0.15s ease;
}

.item-row:hover .custom-checkbox {
  border-color: var(--primary);
}

.item-row.checked .custom-checkbox {
  background-color: var(--success);
  border-color: var(--success);
  color: #ffffff;
}

.item-details {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 2px;
}

.item-title-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.item-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  word-break: break-word;
}

.item-row.checked .item-name {
  text-decoration: line-through;
  color: var(--text-muted);
}

.item-quantity-badge {
  font-size: 0.8rem;
  font-weight: 600;
  background-color: var(--bg-surface-elevated);
  color: var(--text-muted);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
}

.item-notes {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.item-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  color: var(--text-main);
  background-color: var(--bg-surface-elevated);
}

.btn-icon.delete:hover {
  color: var(--danger);
  background-color: var(--danger-light);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.empty-icon {
  width: 64px;
  height: 64px;
  stroke: var(--text-dim);
}

/* Modals & Slide-overs */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: 16px 22px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* Form controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-control {
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--border-focus);
}

.form-row {
  display: flex;
  gap: 12px;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  padding: 9px 18px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border);
  color: var(--text-main);
  border-radius: var(--radius-md);
  padding: 9px 18px;
  font-weight: 500;
  cursor: pointer;
}

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

/* Card components inside settings */
.settings-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.settings-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.settings-card-title {
  font-size: 0.95rem;
  font-weight: 600;
}

.badge-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.badge-tag.success {
  background-color: var(--success-light);
  color: var(--success);
}

.badge-tag.warning {
  background-color: var(--warning-light);
  color: var(--warning);
}

.badge-tag.info {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* Switch toggle */
.switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border);
  transition: .3s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-muted);
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
  border-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(22px);
  background-color: #ffffff;
}

/* Mobile Bottom Navigation */
.mobile-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-bar-height);
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border);
  z-index: 50;
  justify-content: space-around;
  align-items: center;
  padding: 0 12px;
}

.bottom-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: var(--radius-md);
}

.bottom-tab-btn.active {
  color: var(--primary);
  font-weight: 600;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 15;
  }

  .sidebar-backdrop.open {
    display: block;
  }

  .btn-menu-toggle {
    display: block;
  }

  .mobile-bottom-bar {
    display: flex;
  }

  .content-area {
    padding: 14px 16px;
    padding-bottom: 90px;
  }

  .quick-add-box {
    flex-wrap: wrap;
  }

  .input-item-name {
    min-width: 100%;
  }

  .select-category {
    flex: 1;
  }

  .sidebar-footer {
    display: none;
  }
}

/* Collaborators List */
.collaborators-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 180px;
  overflow-y: auto;
}

.collaborator-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.collaborator-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--text-main);
}

.collaborator-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
}