:root {
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --accent: #4f46e5;
  --calories-color: #ef4444;
  --carbs-color: #f59e0b;
  --protein-color: #3b82f6;
  --fat-color: #8b5cf6;
  --success: #10b981;
  --border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
header, main {
  max-width: 600px;
  margin: 0 auto;
}

main {
  padding: 1rem;
  padding-bottom: 5rem;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  padding: 1rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.date-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.date-nav button {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  transition: transform 0.1s, background-color 0.2s;
}

.date-nav button:active {
  transform: scale(0.95);
  background-color: var(--bg);
}

/* Date Display Button */
.date-display {
    font-weight: 600;
    font-size: 1.1rem;
    min-width: 180px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    color: var(--text);
    transition: background-color 0.2s, border-color 0.2s;
}

.date-display:hover {
    border-color: var(--accent);
    background: white;
}

/* Calendar Overlay */
.calendar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    z-index: 50;
    display: flex;
    justify-content: center;
    padding-top: 100px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.calendar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.calendar {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    width: 340px;
    height: fit-content;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    transform: translateY(-10px);
    transition: transform 0.2s ease;
}

.calendar-overlay.active .calendar {
    transform: translateY(0);
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.calendar-header span {
    font-weight: 600;
    font-size: 1.1rem;
}

.calendar-header button {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.calendar-header button:hover {
    background: var(--border);
}

.calendar-today-btn {
    width: 100%;
    padding: 0.4rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    transition: background-color 0.2s;
}

.calendar-today-btn:hover {
    background: var(--border);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.cal-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.875rem;
    cursor: pointer;
    border: none;
    background: none;
    color: var(--text);
    transition: background-color 0.15s, color 0.15s;
}

.cal-day:hover {
    background: var(--bg);
}

.cal-day.other-month {
    color: var(--border);
}

.cal-day.today {
    border: 2px solid var(--accent);
    font-weight: 600;
}

.cal-day.selected {
    background: var(--accent);
    color: white;
    font-weight: 600;
}

.cal-day.selected.today {
    border-color: var(--accent);
}

/* Cards */
.summary-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.summary-card h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

/* Progress Bars */
.macro-bars {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.macro-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.macro-label {
  width: 100px;
  font-size: 0.875rem;
  font-weight: 500;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--bg);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress-fill.calories { background: var(--calories-color); }
.progress-fill.carbs { background: var(--carbs-color); }
.progress-fill.protein { background: var(--protein-color); }
.progress-fill.fat { background: var(--fat-color); }

.progress-fill.over {
  filter: saturate(1.5) brightness(0.8);
}

.macro-value {
  width: 100px;
  text-align: right;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Meal Tabs */
.meals-section {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.meal-tabs {
  display: flex;
  overflow-x: auto;
  gap: 0.5rem;
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}

.meal-tabs::-webkit-scrollbar {
  display: none;
}

.meal-tab {
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.meal-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Meal List */
.meal-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.meal-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.meal-info {
  flex: 1;
}

.meal-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.meal-macros {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.meal-stats {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.meal-calories {
  font-weight: 600;
  color: var(--calories-color);
}

.delete-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  opacity: 0.5;
  transition: opacity 0.2s;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.empty-state .emoji {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: block;
}

/* Buttons */
.add-btn {
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.75rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, background-color 0.2s;
}

.add-btn:active, .submit-btn:active {
  transform: scale(0.98);
}

.submit-btn {
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.75rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.modal {
  background: var(--card-bg);
  width: 100%;
  max-width: 600px;
  border-radius: 16px 16px 0 0;
  padding: 1.5rem;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  max-height: 90vh;
  overflow-y: auto;
}

@media (min-width: 768px) {
  .modal-overlay {
    align-items: center;
  }
  .modal {
    border-radius: 16px;
    transform: translateY(20px) scale(0.95);
  }
  .modal-overlay.active .modal {
    transform: translateY(0) scale(1);
  }
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-header h3 {
  font-size: 1.25rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-secondary);
}

/* Input Tabs */
.input-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.input-tab {
  background: none;
  border: none;
  padding: 0.5rem 0;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.input-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.input-panel.hidden {
  display: none;
}

/* Form Styles */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-row {
  display: flex;
  gap: 1rem;
}

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

/* Search Results */
.search-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.search-bar input {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

.search-bar button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
}

.search-results {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.search-result-item:hover {
  background-color: var(--bg);
}

.search-result-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.search-result-brand {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.search-result-macros {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.search-result-barcode {
  font-size: 0.65rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* Nutrition Preview */
.selected-food {
  background: var(--bg);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.selected-food-name {
  font-weight: 600;
  font-size: 1.1rem;
}

.nutrition-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  background: var(--bg);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.nutrition-preview-item {
  display: flex;
  justify-content: space-between;
}

.nutrition-preview-item.calories {
  font-weight: 600;
  color: var(--calories-color);
}

/* FAB */
.settings-fab {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  z-index: 10;
}

.settings-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 8px rgba(0,0,0,0.15);
}

.settings-fab:active {
  transform: translateY(0);
}

/* Favorites */
.favorites-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 400px;
    overflow-y: auto;
}

.favorite-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.favorite-item:hover {
    background-color: var(--bg);
}

.favorite-info {
    flex: 1;
}

.favorite-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.favorite-macros {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.favorite-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.favorite-delete {
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.4;
    font-size: 0.875rem;
    padding: 0.25rem;
    transition: opacity 0.2s;
}

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

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

/* Meal Actions Group */
.meal-actions-group {
    display: flex;
    gap: 0.75rem;
}

.meal-actions-group .add-btn {
    flex: 1;
}

.scan-quick-btn {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%) !important;
}

@media (max-width: 480px) {
    .meal-actions-group {
        flex-direction: column;
    }
}

/* Photo Scan Tab */
.scan-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.scan-dropzone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 1.5rem 1rem;
    text-align: center;
    background: var(--bg);
    transition: border-color 0.2s, background-color 0.2s;
    cursor: pointer;
}

.scan-dropzone.dragover {
    border-color: var(--accent);
    background: rgba(79, 70, 229, 0.05);
}

.scan-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.scan-icon {
    font-size: 2.5rem;
    line-height: 1;
}

.scan-placeholder h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.scan-placeholder p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.upload-trigger-btn {
    margin-top: 0.5rem;
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.65rem 1.25rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: transform 0.1s, filter 0.2s;
}

.upload-trigger-btn:hover {
    filter: brightness(1.08);
}

.upload-trigger-btn:active {
    transform: scale(0.98);
}

.scan-preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

#scan-preview-img {
    max-width: 100%;
    max-height: 220px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.scan-preview-actions {
    display: flex;
    gap: 0.75rem;
    width: 100%;
    justify-content: center;
}

.btn-subtle {
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-scan-action {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.3);
    transition: transform 0.1s, filter 0.2s;
}

.btn-scan-action:hover {
    filter: brightness(1.08);
}

.btn-scan-action:active {
    transform: scale(0.98);
}

.scan-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    text-align: center;
    background: var(--bg);
    border-radius: 12px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(79, 70, 229, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#scan-status-text {
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}

.scan-status small {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.scan-error {
    background: #fee2e2;
    color: #b91c1c;
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    line-height: 1.4;
    text-align: left;
}

/* AI Hint Banner */
.ai-hint-banner {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
    border: 1px solid rgba(79, 70, 229, 0.3);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    animation: fadeIn 0.3s ease;
}

.ai-hint-icon {
    font-size: 1.3rem;
    line-height: 1;
}

.ai-hint-body {
    flex: 1;
}

.ai-hint-body strong {
    display: block;
    font-size: 0.875rem;
    color: var(--accent);
    margin-bottom: 0.15rem;
}

.ai-hint-body p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
}

.ai-hint-close {
    background: none;
    border: none;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0 0.25rem;
}

.manual-header-row {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 0.5rem;
}

.text-btn {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.text-btn:hover {
    background: var(--bg);
}

.field-highlight {
    animation: fieldPulse 1.2s ease;
}

@keyframes fieldPulse {
    0% { background-color: rgba(79, 70, 229, 0.18); }
    100% { background-color: transparent; }
}