/**
 * styles.css - SteadyPlate UI styles
 *
 * Design principles:
 *   - Warm, calm color palette
 *   - Clean, readable typography
 *   - Minimal cognitive load
 *   - Accessible contrast ratios
 *   - Mobile-first responsive layout
 */

/* --- CSS Variables --- */
:root {
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f3f0;
  --color-border: #e8e4df;
  --color-border-light: #f0ede9;

  --color-text: #3d3833;
  --color-text-secondary: #7a746c;
  --color-text-muted: #a9a29a;

  --color-primary: #2d8855;
  --color-primary-light: #e2f0e8;
  --color-primary-dark: #1e6b3f;

  --color-accent: #e07030;
  --color-accent-light: #fdf0e6;

  --color-info: #5a82a6;
  --color-info-light: #e6eff6;

  --color-caution: #c9a24e;
  --color-caution-light: #faf5e6;

  --color-gentle: #a0b0c0;
  --color-gentle-light: #eef2f6;

  --color-low: #2d8855;
  --color-moderate: #c9a24e;
  --color-high: #c47a5a;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  --transition: 0.2s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* --- App Shell --- */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 16px;
}

/* --- Header --- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.app-logo-icon {
  height: 120px;
  width: auto;
  border-radius: var(--radius-lg);
  object-fit: contain;
}

/* --- Navigation Tabs --- */
.nav-tabs {
  display: flex;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border-light);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-body);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-tab:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.nav-tab.active {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.nav-tab svg {
  width: 18px;
  height: 18px;
}

/* --- Main Content Area --- */
.main-content {
  flex: 1;
  padding: 20px 0 100px;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

/* --- Section / Card Components --- */
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

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

.card-badge {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 500;
}

/* --- Level Indicators --- */
.level-low {
  background: #dff0e5;
  color: var(--color-low);
}

.level-moderate {
  background: #fff8e1;
  color: #8a6d1b;
}

.level-high {
  background: #fce8e2;
  color: var(--color-high);
}

.level-none {
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

/* --- Food Search --- */
.food-search-container {
  position: relative;
  margin-bottom: 16px;
}

.food-search-input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-family: var(--font-body);
  background: var(--color-surface);
  color: var(--color-text);
  transition: var(--transition);
}

.food-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.food-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.food-search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 300px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}

.food-search-results.open {
  display: block;
}

.food-search-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 1px solid var(--color-border-light);
}

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

.food-search-item:hover {
  background: var(--color-primary-light);
}

.food-search-item-name {
  font-size: 0.9rem;
  font-weight: 500;
}

.food-search-item-cat {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* --- Food Tags / Pills --- */
.food-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.food-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
}

.food-tag-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border: none;
  background: rgba(0,0,0,0.1);
  color: var(--color-primary-dark);
  border-radius: 50%;
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
  padding: 0;
}

.food-tag-remove:hover {
  background: rgba(0,0,0,0.2);
}

/* --- Analysis Panel --- */
.analysis-panel {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
}

.analysis-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
}

.analysis-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.analysis-value {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 100px;
}

.analysis-bar-container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  margin-left: 12px;
}

.analysis-bar {
  flex: 1;
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

.analysis-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s ease;
}

.analysis-bar-fill.low { background: var(--color-low); width: 33%; }
.analysis-bar-fill.moderate { background: var(--color-moderate); width: 66%; }
.analysis-bar-fill.high { background: var(--color-high); width: 100%; }

/* --- Suggestion Cards --- */
.suggestion-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 12px;
  border-left: 3px solid var(--color-primary);
}

.suggestion-card.awareness {
  border-left-color: var(--color-caution);
}

.suggestion-card.hydration {
  border-left-color: var(--color-info);
}

.suggestion-card.post-exercise {
  border-left-color: var(--color-accent);
}

.suggestion-reason {
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.5;
}

.suggestion-options {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.suggestion-option {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.suggestion-option:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

/* --- Timeline --- */
.timeline-container {
  position: relative;
}

.timeline-entry {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  position: relative;
}

.timeline-time {
  width: 72px;
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding-top: 4px;
  text-align: right;
}

.timeline-content {
  flex: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
}

.timeline-dot {
  position: absolute;
  left: 80px;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  border-radius: 50%;
  z-index: 1;
}

.timeline-dot.exercise {
  background: var(--color-accent);
}

.timeline-dot.hydration {
  background: var(--color-info);
}

.timeline-foods {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 6px;
}

.timeline-food-pill {
  font-size: 0.8rem;
  padding: 2px 10px;
  background: var(--color-surface-alt);
  border-radius: 100px;
  color: var(--color-text);
}

.timeline-notes {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

.timeline-meta {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.timeline-meta-item {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.timeline-actions {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.timeline-delete {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
}

.timeline-delete:hover {
  color: var(--color-high);
  background: #fce8e2;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: var(--transition);
}

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

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

.btn-secondary {
  background: var(--color-surface-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-family: var(--font-body);
  background: var(--color-surface);
  color: var(--color-text);
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-textarea {
  resize: vertical;
  min-height: 60px;
}

/* --- Toggle Switches --- */
.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toggle-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.toggle-label {
  font-size: 0.875rem;
  color: var(--color-text);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

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

.toggle-slider {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-border);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 2px;
  bottom: 2px;
  background: white;
  border-radius: 50%;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* --- Sliders --- */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.slider-item {
  padding: 10px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.slider-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}

.slider-label {
  font-size: 0.85rem;
  color: var(--color-text);
}

.slider-value {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.slider-input {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-border);
  border-radius: 3px;
  outline: none;
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.slider-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
}

/* --- Dashboard Quick Cards --- */
.quick-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.quick-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

.quick-card-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

.quick-card-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* --- AI Response Area --- */
.ai-response {
  background: var(--color-gentle-light);
  border: 1px solid var(--color-gentle);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.ai-response-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.ai-response-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* --- Empty States --- */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state-text {
  font-size: 0.9rem;
  line-height: 1.5;
  max-width: 300px;
  margin: 0 auto;
}

/* --- Disclaimer --- */
.disclaimer {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
  padding: 16px;
  border-top: 1px solid var(--color-border-light);
  margin-top: 32px;
}

/* --- Category Filter Buttons --- */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.category-btn {
  padding: 5px 12px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 100px;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-family: var(--font-body);
  transition: var(--transition);
}

.category-btn:hover,
.category-btn.active {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

/* --- Tabs within views --- */
.sub-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: 3px;
}

.sub-tab {
  flex: 1;
  padding: 8px 12px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font-body);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.sub-tab.active {
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

/* --- Food Browse Grid --- */
.food-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  max-height: 400px;
  overflow-y: auto;
  padding: 4px;
}

.food-grid-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.food-grid-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.food-grid-item-name {
  font-size: 0.85rem;
  font-weight: 500;
}

.food-grid-item-add {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.food-grid-item:hover .food-grid-item-add {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* --- Exercise Form --- */
.exercise-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.exercise-form .form-group.full-width {
  grid-column: 1 / -1;
}

/* --- Export/Import --- */
.data-management {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .app-container {
    padding: 0 12px;
  }

  .nav-tab {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .nav-tab span.tab-label {
    display: none;
  }

  .quick-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .food-grid {
    grid-template-columns: 1fr;
  }

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

  .timeline-time {
    width: 56px;
    font-size: 0.75rem;
  }
}

/* --- Energy Rating Stars --- */
.energy-stars {
  display: flex;
  gap: 4px;
}

.energy-star {
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 18px;
  color: var(--color-border);
  transition: var(--transition);
  padding: 0;
}

.energy-star.filled {
  color: var(--color-caution);
}

.energy-star:hover {
  transform: scale(1.2);
}

/* --- Hydration tracker --- */
.hydration-bar {
  display: flex;
  gap: 6px;
  align-items: center;
}

.hydration-glass {
  width: 28px;
  height: 36px;
  border: 2px solid var(--color-border);
  border-radius: 0 0 6px 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.hydration-glass.filled {
  border-color: var(--color-info);
}

.hydration-glass.filled::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100%;
  background: var(--color-info-light);
}

.hydration-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-left: 8px;
}

/* --- Scrollbar styling --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* --- Modal/Overlay --- */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.3);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 24px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  float: right;
  border: none;
  background: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 4px;
}

/* --- Utility --- */
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: 0.85rem; }
.hidden { display: none !important; }