/* ===== CSS CUSTOM PROPERTIES (CSS VARIABLES) ===== */
:root {
  /* Primary Colors */
  --primary-color: #10b981;
  --primary-hover: #059669;
  --primary-light: #d1fae5;
  
  /* Secondary Colors */
  --secondary-color: #6366f1;
  --secondary-hover: #4f46e5;
  --secondary-light: #e0e7ff;
  
  /* Neutral Colors - Light Theme */
  --background-color: #ffffff;
  --surface-color: #f8fafc;
  --card-background: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  
  /* Status Colors */
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --info-color: #3b82f6;
  
  /* Shadows */
  --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);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --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;
  --font-size-4xl: 2.25rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.2s ease-in-out;
  --transition-slow: 0.3s ease-in-out;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --background-color: #0f172a;
  --surface-color: #1e293b;
  --card-background: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #475569;
  --border-light: #334155;
  
  --primary-light: #064e3b;
  --secondary-light: #312e81;
}

/* ===== RESET AND BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-color);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

/* ===== LAYOUT COMPONENTS ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.main-content {
  min-height: calc(100vh - 80px);
  padding-top: 80px;
}

.dashboard-main {
  background-color: var(--surface-color);
}

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background-color: var(--card-background);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all var(--transition-base);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: var(--font-size-xl);
  color: var(--text-primary);
}

.brand-icon {
  font-size: 1.5rem;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background-color: var(--primary-light);
}

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

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background-color: var(--surface-color);
  border-color: var(--primary-color);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 3px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Accessibility: minimum touch target */
}

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

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

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

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

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

.btn-danger:hover {
  background-color: #dc2626;
  color: white;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

/* ===== HERO SECTION ===== */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.1;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: white;
}

.highlight {
  background: linear-gradient(45deg, #fbbf24, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-xl);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-placeholder {
  background: rgba(255, 255, 255, 0.1);
  border: 2px dashed rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3xl);
  text-align: center;
  backdrop-filter: blur(10px);
}

.hero-emoji {
  font-size: 4rem;
  display: block;
  margin-bottom: var(--spacing-md);
}

/* ===== SECTIONS ===== */
.features {
  padding: var(--spacing-3xl) 0;
  background-color: var(--surface-color);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  color: var(--text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background-color: var(--card-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  border: 1px solid var(--border-light);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-card p {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ===== CTA SECTION ===== */
.cta {
  background-color: var(--card-background);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.cta-content h2 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.cta-content p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--surface-color);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.footer-text {
  color: var(--text-muted);
  margin: 0;
}

/* ===== PAGE HEADER ===== */
.page-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  padding: var(--spacing-xl) 0;
}

.page-header h1 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin: 0;
}

/* ===== DASHBOARD COMPONENTS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.stat-card {
  background-color: var(--card-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  transition: all var(--transition-base);
}

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

.stat-icon {
  font-size: 2rem;
  opacity: 0.8;
}

.stat-content h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.stat-content p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

/* ===== CHARTS SECTION ===== */
.charts-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.chart-container {
  width: 100%;
}

.chart-card {
  background-color: var(--card-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.chart-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.chart-card canvas {
  max-height: 300px;
}

/* ===== FORMS ===== */
.form-section {
  margin-bottom: var(--spacing-3xl);
}

.form-card {
  background-color: var(--card-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.form-card h2 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background-color: var(--background-color);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  min-height: 44px; /* Accessibility: minimum touch target */
}

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

.form-group small {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.macros-section {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-light);
}

.macros-section h3 {
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-light);
}

/* ===== MEALS COMPONENTS ===== */
.recent-meals,
.today-meals,
.weekly-overview {
  margin-bottom: var(--spacing-3xl);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2,
.section-header h3 {
  margin: 0;
  color: var(--text-primary);
}

.meals-list,
.meals-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.meal-card {
  background-color: var(--card-background);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

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

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

.meal-info h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.meal-meta {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.meal-nutrition {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

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

.nutrition-value {
  font-weight: 600;
  color: var(--primary-color);
  display: block;
}

.nutrition-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== QUICK ACTIONS ===== */
.quick-actions {
  margin-bottom: var(--spacing-3xl);
}

.quick-actions h3 {
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
}

.actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.action-card {
  background-color: var(--card-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-base);
}

.action-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: var(--primary-color);
}

.action-icon {
  font-size: 2rem;
  opacity: 0.8;
}

/* ===== WEEK GRID ===== */
.week-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-md);
}

.day-card {
  background-color: var(--card-background);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  min-height: 120px;
}

.day-header {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  text-align: center;
  font-size: var(--font-size-sm);
}

.day-meals {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.day-meal {
  font-size: var(--font-size-xs);
  padding: var(--spacing-xs);
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-radius: var(--radius-sm);
  text-align: center;
}

/* ===== PROGRESS COMPONENTS ===== */
.period-selector {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-3xl);
}

.period-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 1px solid var(--border-color);
  background-color: var(--card-background);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.period-btn.active,
.period-btn:hover {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.progress-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.progress-card {
  background-color: var(--card-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.progress-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.metric {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--surface-color);
  border-radius: var(--radius-md);
}

.metric-label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.metric-value {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--primary-color);
}

.progress-charts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

/* ===== GOAL PROGRESS ===== */
.goal-progress {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.progress-bar-container {
  margin-bottom: var(--spacing-md);
}

.progress-bar-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.progress-bar {
  height: 8px;
  background-color: var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary-color);
  transition: width var(--transition-slow);
}

/* ===== LIBRARY COMPONENTS ===== */
.library-controls {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.search-bar {
  flex: 1;
  min-width: 300px;
  position: relative;
}

.search-bar input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-right: 50px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--background-color);
  color: var(--text-primary);
}

.search-btn {
  position: absolute;
  right: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--font-size-lg);
  color: var(--text-muted);
}

.filter-controls {
  display: flex;
  gap: var(--spacing-md);
}

.filter-controls select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--background-color);
  color: var(--text-primary);
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.library-meal-card {
  background-color: var(--card-background);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.library-meal-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

/* ===== PROFILE COMPONENTS ===== */
.profile-section,
.goals-section,
.bmi-section {
  margin-bottom: var(--spacing-xl);
}

.auto-calculate {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
}

.auto-calculate small {
  display: block;
  margin-top: var(--spacing-sm);
  color: var(--text-muted);
}

.bmi-calculator {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

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

.bmi-value {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.bmi-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
}

.bmi-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.bmi-category {
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  background-color: var(--surface-color);
  color: var(--text-primary);
}

.bmi-info h4 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.bmi-info ul {
  list-style: none;
}

.bmi-info li {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.bmi-range {
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== MODAL ===== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  animation: fadeIn var(--transition-base);
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--card-background);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  animation: slideIn var(--transition-base);
}

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

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

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
}

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

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

/* ===== UTILITY COMPONENTS ===== */
.date-display {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  background-color: var(--surface-color);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
}

.info-banner {
  background-color: var(--info-color);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xl);
}

.info-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

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

.empty-state {
  text-align: center;
  padding: var(--spacing-3xl);
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.success-message {
  background-color: var(--success-color);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: slideDown var(--transition-base);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.insight-card {
  background-color: var(--card-background);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--primary-color);
}

.insight-card h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.insight-card p {
  color: var(--text-secondary);
  margin: 0;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideIn {
  from { 
    opacity: 0;
    transform: translateY(-20px);
  }
  to { 
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from { 
    opacity: 0;
    transform: translateY(-10px);
  }
  to { 
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.show {
    display: flex;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-xl);
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
  
  .charts-section {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .library-controls {
    flex-direction: column;
  }
  
  .filter-controls {
    flex-wrap: wrap;
  }
  
  .week-grid {
    grid-template-columns: 1fr;
  }
  
  .progress-charts {
    grid-template-columns: 1fr;
  }
  
  .bmi-calculator {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .modal-content {
    width: 95%;
    margin: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .actions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .library-grid {
    grid-template-columns: 1fr;
  }
  
  .progress-metrics {
    grid-template-columns: 1fr;
  }
}

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

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus,
textarea:focus,
a:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --text-secondary: #000000;
  }
  
  [data-theme="dark"] {
    --border-color: #ffffff;
    --text-secondary: #ffffff;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .navbar,
  .nav-controls,
  .hero-actions,
  .form-actions,
  .modal {
    display: none !important;
  }
  
  .main-content {
    padding-top: 0;
  }
  
  .hero {
    background: none;
    color: black;
  }
  
  .chart-card,
  .stat-card,
  .feature-card {
    break-inside: avoid;
  }
}

/* ===== LOADING STATES ===== */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 1s ease-in-out infinite;
}

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

/* ===== FORM VALIDATION ===== */
.form-group input:invalid,
.form-group select:invalid {
  border-color: var(--error-color);
}

.form-group input:valid,
.form-group select:valid {
  border-color: var(--success-color);
}

.error-message {
  color: var(--error-color);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: none;
}

.error-message.show {
  display: block;
}

/* ===== CUSTOM SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--surface-color);
}

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

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

/* ===== ADDITIONAL UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

.fade-in {
  animation: fadeIn var(--transition-base);
}

.slide-in {
  animation: slideIn var(--transition-base);
}

/* ===== COMPONENT SPECIFIC STYLES ===== */
.meal-type-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--secondary-light);
  color: var(--secondary-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.calorie-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.macro-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.macro-item {
  text-align: center;
  padding: var(--spacing-sm);
  background-color: var(--surface-color);
  border-radius: var(--radius-sm);
}

.macro-value {
  font-weight: 600;
  color: var(--text-primary);
}

.macro-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ===== ENHANCED INTERACTIVE ELEMENTS ===== */
.interactive-card {
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.interactive-card:active {
  transform: translateY(0);
}

/* Ripple effect for buttons */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: all var(--transition-fast);
  transform: translate(-50%, -50%);
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

/* ===== ACCESSIBILITY ENHANCEMENTS ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1001;
}

.skip-link:focus {
  top: 6px;
}

/* Focus indicators for custom elements */
.action-card:focus,
.meal-card:focus,
.library-meal-card:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
.chart-card canvas {
  will-change: transform;
}

.hero::before {
  will-change: opacity;
}

/* Optimize animations for better performance */
.feature-card,
.stat-card,
.meal-card,
.action-card {
  will-change: transform;
}

/* ===== ADDITIONAL COMPONENT STYLES ===== */
.default-badge {
  background-color: var(--info-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.meal-detail-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.meal-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
}

.meal-type-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.serving-info {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.nutrition-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.nutrition-detail-card {
  background-color: var(--surface-color);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
}

.nutrition-detail-card h5 {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.nutrition-detail-value {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--primary-color);
}

.meal-detail-meta {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.calories-large {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
}

.calories-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-left: var(--spacing-xs);
}

.nutrition-highlight {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.macro-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

.library-meal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.library-meal-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.library-meal-nutrition {
  margin-bottom: var(--spacing-md);
}

.library-meal-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: space-between;
}

.btn-icon {
  background: none;
  border: 1px solid var(--border-color);
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  color: var(--text-muted);
}

.btn-icon:hover {
  background-color: var(--error-color);
  border-color: var(--error-color);
  color: white;
}

.current-day {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
}

.default-meal {
  border-left: 4px solid var(--info-color);
}

.meal-type-badge.large {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.on-track {
  background-color: var(--success-color) !important;
}

.progress-percentage {
  text-align: right;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

.insight-card.success {
  border-left-color: var(--success-color);
}

.insight-card.warning {
  border-left-color: var(--warning-color);
}

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

.bmi-category.underweight {
  background-color: var(--warning-color);
  color: white;
}

.bmi-category.normal {
  background-color: var(--success-color);
  color: white;
}

.bmi-category.overweight {
  background-color: var(--warning-color);
  color: white;
}

.bmi-category.obese {
  background-color: var(--error-color);
  color: white;
}

/* ===== FINAL RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 320px) {
  .hero-title {
    font-size: var(--font-size-xl);
  }
  
  .actions-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-brand .brand-text {
    display: none;
  }
  
  .nutrition-details {
    grid-template-columns: 1fr;
  }
  
  .macro-summary {
    grid-template-columns: 1fr;
  }
}