:root {
  --color-primary: #10b981;
  --color-primary-dark: #059669;
  --color-primary-light: #34d399;

  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;

  --border-color: #e2e8f0;
  --border-focus: var(--color-primary);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

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

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;

    --border-color: #475569;
  }

  .modal .field label {
    color: var(--text-secondary);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
}

/* Focus Styles for Accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Visually Hidden (Screen Readers Only) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg);
}

@media (max-width: 600px) {
  .app {
    padding: var(--space-md);
  }
}

.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-lg);
}

.app-logo {
  display: block;
  width: clamp(56px, 15vw, 80px);
  height: clamp(56px, 15vw, 80px);
  object-fit: contain;
}

.app-heading {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.app-title {
  font-size: clamp(1rem, 5vw, 2rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
}

.app-subtitle {
  margin: 4px 0 0;
  color: var(--text-secondary);
  font-size: clamp(0.42rem, 1.6vw, 0.65rem);
  letter-spacing: .08em;
  text-transform: uppercase;
  opacity: .7;
}

.logo-rotation {
  animation: wiggly 4s infinite linear;
}

@keyframes wiggly {

  0%,
  50%,
  100% {
    transform: rotate(0);
  }

  25% {
    transform: rotate(5deg);
  }

  75% {
    transform: rotate(-5deg);
  }
}

.progress-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.progress-track {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), #3b82f6);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.input-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.input-form {
  margin-bottom: var(--space-lg);
}

.input-row {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.field label,
.category-fieldset label,
.datetime-label,
.btn.btn-primary,
.btn.btn-secondary,
.btn.btn-danger {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}


.field-item {
  flex: 2.4;
  min-width: 120px;
}

.field-qty {
  flex: 0.85;
  min-width: 70px;
}

.field-unit {
  flex: 0.95;
  min-width: 90px;
}

.field-notes {
  flex: 1.2;
  min-width: 100px;
}

.field-notes .btn {
  width: auto;
  min-width: 72px;
  justify-content: center;
}

.field-action {
  flex: 0 0 auto;
}

@media (max-width: 790px) {
  .input-row {
    flex-wrap: wrap;
  }

  .field {
    flex: 1 1 calc(50% - var(--space-sm)) !important;
    min-width: auto !important;
  }

  .field-item {
    flex: 1 1 100% !important;
  }

  .field-qty,
  .field-unit,
  .field-notes {
    flex: 1 1 calc(33.333% - var(--space-sm)) !important;
  }

  .field-qty {
    min-width: 54px !important;
  }

  .field-unit {
    min-width: 116px !important;
  }

  .field-notes .btn {
    width: 100%;
    min-width: 0;
    padding-left: 12px;
    padding-right: 12px;
  }

  .field-action {
    flex: 1 1 100% !important;
  }
}

input[type="text"],
input[type="number"],
select,
textarea {
  padding: 12px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
  height: 46px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

input:invalid {
  border-color: var(--color-error);
}

input:invalid:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

input::placeholder {
  color: var(--text-tertiary);
}

input[type="number"] {
  text-align: center;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 12px 20px;
  height: 46px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

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

.btn-primary:active {
  transform: translateY(0);
}

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

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

.btn-danger {
  background: #fee2e2 !important;
  color: #dc2626 !important;
}

.btn-danger:hover {
  background: #fecaca;
}

.category-fieldset {
  border: none;
  padding: 0;
}

.category-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: var(--space-sm) auto var(--space-lg) auto;
}

.category-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.category-tag:not(.active) {
  opacity: 0.6;
}

.category-tag:not(.active):hover {
  opacity: 0.85;
}

.category-tag.active {
  border-color: currentColor;
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  opacity: 1;
}

.category-tag[data-category="produce"],
.category-header.produce {
  background: #dcfce7;
  color: #166534;
}

.category-tag[data-category="meat"],
.category-header.meat {
  background: #fee2e2;
  color: #991b1b;
}

.category-tag[data-category="dairy"],
.category-header.dairy {
  background: #fdffb8;
  color: #5a5b16;
}

.category-tag[data-category="deli"],
.category-header.deli {
  background: #ffd9ef;
  color: #f9048f;
}

.category-tag[data-category="pantry"],
.category-header.pantry {
  background: #d8ff90;
  color: rgb(68, 88, 0);
}

.category-tag[data-category="frozen"],
.category-header.frozen {
  background: #cee4fd;
  color: #004eae;
}

.category-tag[data-category="bakery"],
.category-header.bakery {
  background: #ffb996;
  color: #8f3000;
}

.category-tag[data-category="snacks"],
.category-header.snacks {
  background: #ffede1;
  color: #ff6600;
}

.category-tag[data-category="beverages"],
.category-header.beverages {
  background: #bafaff;
  color: #007d86;
}

.category-tag[data-category="health"],
.category-header.health {
  background: #ffa1d0;
  color: #7e003f;
}

.category-tag[data-category="household"],
.category-header.household {
  background: #e1bcff;
  color: #6b21a8;
}

.category-tag[data-category="pet"],
.category-header.pet {
  background: #b8fceb;
  color: #006b50;
}

.category-tag[data-category="other"],
.category-header.other {
  background: #e2e2e2;
  color: #142b4c;
}

.list-section {
  margin-bottom: var(--space-lg);
}

.lists-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.drag-hint {
  text-align: center;
  padding: var(--space-md);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-style: italic;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
}

.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

.category-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
}

.category-section.drag-over {
  box-shadow: 0 0 0 3px var(--color-primary), var(--shadow-lg);
}

.category-header {
  padding: var(--space-md) var(--space-lg);
  font-weight: 600;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.item-count {
  font-size: 1rem;
  opacity: 0.8;
  font-weight: 500;
}

.items-list {
  padding: var(--space-sm);
}

.item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xs);
  background: var(--bg-primary);
  cursor: grab;
  user-select: none;
  touch-action: pan-y;
  transition: all var(--transition-fast);
  animation: slideIn var(--transition-base);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.item:last-child {
  margin-bottom: 0;
}

.item:hover {
  box-shadow: var(--shadow-sm);
}

.item.dragging {
  opacity: 0.7;
  cursor: grabbing;
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
}

.item.drag-origin {
  opacity: 0.25;
}

.drag-ghost {
  position: fixed;
  pointer-events: none;
  margin: 0;
  opacity: 0.9;
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
}

.item.shake {
  animation: shake 0.35s;
}

@keyframes shake {
  0% {
    transform: translateX(0);
  }

  20% {
    transform: translateX(-4px);
  }

  40% {
    transform: translateX(4px);
  }

  60% {
    transform: translateX(-3px);
  }

  80% {
    transform: translateX(3px);
  }

  100% {
    transform: translateX(0);
  }
}

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

.item.checked .item-badge,
.item.checked .item-notes {
  opacity: 0.6;
}

.drag-handle {
  color: var(--text-tertiary);
  font-size: 1.125rem;
  padding: 4px;
  cursor: grab;
  opacity: 0.5;
  touch-action: none;
  transition: opacity var(--transition-fast);
}

.item:hover .drag-handle {
  opacity: 1;
}

.drag-handle:active {
  cursor: grabbing;
}

.drop-indicator {
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  margin: 4px 0;
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.drop-indicator.active {
  opacity: 1;
}



.item-checkbox {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
  background: var(--bg-secondary);
  transition: all var(--transition-fast);
}

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

.item.checked .item-checkbox {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.check-icon::after {
  content: '✓';
  color: #ffffff;
  font-size: 0.875rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.item.checked .check-icon::after {
  opacity: 1;
}

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

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

.item-name {
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.item-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: #dbeafe;
  color: #1e40af;
}

.item-notes {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  padding: 6px 10px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
}

.item-delete {
  opacity: 0;
  color: var(--color-error);
  font-size: 1.5rem;
  padding: 4px 8px;
  cursor: pointer;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.item:hover .item-delete {
  opacity: 1;
}

.item-delete:hover {
  background: #fee2e2;
}

@media (hover: none) {
  .item-delete {
    opacity: 1;
  }
}

.datetime-section {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.datetime-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: nowrap;
}

.datetime-label-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  white-space: nowrap;
}

.datetime-icon {
  font-size: 1.25rem;
}

.datetime-inputs-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.datetime-input {
  padding: 12px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 46px;
  line-height: 1.2;
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.datetime-input[type="date"] {
  flex: 2;
  min-width: 130px;
  text-align: center;
}

.datetime-input[type="time"] {
  flex: 1;
  min-width: 110px;
  text-align: center;
}

.datetime-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
  outline: none;
}

.btn-small {
  padding: 12px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  height: 46px;
  white-space: nowrap;
}

.datetime-display {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-info);
  color: white;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--transition-base);
}

.datetime-display.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 600px) {
  .datetime-row {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
  }

  .datetime-inputs-row {
    width: 100%;
    max-width: 400px;
  }
}

.app-footer {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.app-footer #copyright {
  font-size: 0.875rem;
  padding-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--color-primary), #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.action-group {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
}

@media (max-width: 600px) {
  .action-group {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-sm);
  }

  .action-group .btn {
    width: 100%;
    white-space: nowrap;
  }
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: grid;
  place-items: center;
  min-height: 100dvh;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: var(--z-modal);
  border: none;
}

.modal[open],
.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 450px;
  width: 100%;
  margin: auto;
  justify-self: center;
  align-self: center;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

.modal[open] .modal-content,
.modal.active .modal-content {
  transform: scale(1);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.edit-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

#edit-notes {
  resize: none;
  overflow-y: auto;
  height: auto;
  min-height: calc(4 * 1.2em + 24px);
  line-height: 1.2;
}

#notes-textarea {
  resize: none;
  overflow-y: auto;
  height: auto;
  min-height: calc(4 * 1.2em + 24px);
  line-height: 1.2;
}

.form-row {
  display: flex;
  gap: var(--space-md);
}

.form-row .field {
  flex: 1;
}

.modal-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.toast {
  position: fixed;
  top: 50%;
  left: 50%;
  bottom: auto;
  right: auto;
  background: var(--color-success);
  color: white;
  padding: 1rem 1rem;
  border-radius: var(--radius-full);
  font-size: clamp(0.8rem, 1vw, 1rem);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;

  /* center + animate using a variable */
  transform: translate(-50%, -50%) translateY(var(--toast-y, 20px));
  transition: opacity var(--transition-base), transform var(--transition-base);

  z-index: var(--z-toast);
  pointer-events: none;
  min-width: max-content;
  max-width: 75%;
  text-align: center;
}

.toast.show {
  opacity: 1;
  --toast-y: 0px;
}

.toast[data-type="error"] {
  background: var(--color-error);
}

.storage-warning {
  background: #fef3c7;
  color: #92400e;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
  text-align: center;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-muted {
  color: var(--text-secondary);
}

.mt-sm {
  margin-top: var(--space-sm);
}

.mt-md {
  margin-top: var(--space-md);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-sm {
  margin-bottom: var(--space-sm);
}

.mb-md {
  margin-bottom: var(--space-md);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}