/* CSS Custom Properties */
:root {
  --color-primary: #00ADB5;
  --color-secondary: #393E46;
  --color-dark: #222831;
  --color-light: #EEEEEE;
  --color-accent: #FFD369;
  --color-white: #FFFFFF;
  --color-error: #FF6B6B;
  --color-success: #4ECDC4;
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 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: 2rem;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --box-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  
  --transition: all 0.3s ease;
  --z-modal: 1000;
  --z-toast: 1100;
  --z-loading: 1200;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-light: #393E46;
  --color-white: #222831;
  --color-dark: #EEEEEE;
  --color-secondary: #EEEEEE;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-white);
  transition: var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

/* App Container */
.app-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--box-shadow);
}

.header__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.header__title {
  font-size: var(--font-size-2xl);
  margin: 0;
}

.header__controls {
  display: flex;
  gap: var(--spacing-sm);
}

/* Navigation */
.nav {
  background-color: var(--color-light);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  padding: var(--spacing-sm) 0;
  overflow-x: auto;
}

.nav__list {
  display: flex;
  list-style: none;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  gap: var(--spacing-sm);
}

.nav__item {
  flex-shrink: 0;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  border-radius: var(--border-radius);
  color: var(--color-secondary);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  font-size: var(--font-size-sm);
  white-space: nowrap;
}

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

.nav__link .icon {
  font-size: var(--font-size-lg);
}

/* Main Content */
.main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  width: 100%;
}

/* Sections */
.section {
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}

.section--active {
  display: block;
}

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

/* Calculator Steps */
.step {
  display: none;
}

.step--active {
  display: block;
  animation: slideIn 0.3s ease-out;
}

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

.step__actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

/* Meal Types */
.meal-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.meal-type {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border: 2px solid var(--color-light);
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.meal-type:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--box-shadow);
}

.meal-type.selected {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-white);
}

.meal-type__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

.meal-type__name {
  font-weight: 500;
}

/* People Counter */
.people-counter {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  max-width: 400px;
  margin: 0 auto var(--spacing-xl);
}

.counter-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--color-light);
  border-radius: var(--border-radius);
}

.counter-group__label {
  font-weight: 500;
  color: var(--color-secondary);
}

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

.counter__btn {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-lg);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.counter__btn:hover {
  background-color: var(--color-secondary);
  transform: scale(1.1);
}

.counter__input {
  width: 60px;
  text-align: center;
  border: 1px solid var(--color-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm);
  font-size: var(--font-size-base);
}

/* Food Selection */
.food-search {
  margin-bottom: var(--spacing-lg);
}

.search-input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-light);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 173, 181, 0.1);
}

.food-categories {
  margin-bottom: var(--spacing-xl);
}

.food-category {
  margin-bottom: var(--spacing-lg);
}

.food-category__title {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-accent);
}

.food-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-sm);
}

.food-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-light);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

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

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

.food-item__checkbox {
  margin-right: var(--spacing-sm);
}

.food-item__name {
  flex: 1;
}

.food-item__unit {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

.food-item.selected .food-item__unit {
  color: rgba(255, 255, 255, 0.8);
}

/* Selected Foods */
.selected-foods {
  background-color: var(--color-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.selected-foods h3 {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
}

.selected-foods__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.selected-food-tag {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
}

.selected-food-tag__remove {
  background: none;
  border: none;
  color: var(--color-white);
  cursor: pointer;
  font-size: var(--font-size-lg);
  line-height: 1;
}

/* Results */
.results {
  background-color: var(--color-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.results__summary {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius);
}

.results__summary h3 {
  margin-bottom: var(--spacing-sm);
}

.results__summary p {
  font-size: var(--font-size-lg);
  margin: var(--spacing-xs) 0;
}

.results__list {
  display: grid;
  gap: var(--spacing-md);
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--color-accent);
}

.result-item__name {
  font-weight: 500;
  color: var(--color-secondary);
}

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

.result-item__per-person {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
  margin-bottom: var(--spacing-xs);
}

.result-item__total {
  font-weight: 600;
  color: var(--color-primary);
}

.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  min-height: 44px;
}

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

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

.btn--primary:hover:not(:disabled) {
  background-color: var(--color-secondary);
  transform: translateY(-1px);
}

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

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn--icon {
  width: 44px;
  height: 44px;
  padding: 0;
  background-color: transparent;
  color: var(--color-white);
}

.btn--icon:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.btn--full {
  width: 100%;
  margin-bottom: var(--spacing-sm);
}

.btn--next {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* Cards */
.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--box-shadow);
  margin-bottom: var(--spacing-md);
  transition: var(--transition);
}

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

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

.card__title {
  color: var(--color-primary);
  margin: 0;
}

.card__date {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

.card__content {
  margin-bottom: var(--spacing-md);
}

.card__actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* Achievements */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.achievement {
  text-align: center;
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.achievement.unlocked {
  border: 2px solid var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-dark);
}

.achievement.unlocked .achievement__icon {
  filter: grayscale(0);
}

.achievement__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
  filter: grayscale(1);
  opacity: 0.5;
}

.achievement.unlocked .achievement__icon {
  opacity: 1;
}

.achievement__title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.achievement__description {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

.achievement.unlocked .achievement__description {
  color: var(--color-dark);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal);
  animation: fadeIn 0.3s ease-in-out;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal__content {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease-out;
}

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

.modal__title {
  margin: 0;
  color: var(--color-primary);
}

.modal__close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--color-secondary);
  line-height: 1;
}

.modal__body {
  padding: var(--spacing-lg);
}

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

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

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-light);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 173, 181, 0.1);
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-xl);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-toast);
}

.toast {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-sm);
  box-shadow: var(--box-shadow-lg);
  animation: slideInRight 0.3s ease-out;
  max-width: 300px;
}

.toast.error {
  background-color: var(--color-error);
}

.toast.success {
  background-color: var(--color-success);
}

/* Loading */
.loading {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.9);
  z-index: var(--z-loading);
  justify-content: center;
  align-items: center;
}

.loading.active {
  display: flex;
}

.loading__spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-light);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Footer */
.footer {
  background-color: var(--color-secondary);
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-lg);
  margin-top: auto;
}

.footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

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

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

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

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .header__title {
    font-size: var(--font-size-xl);
  }
  
  .nav {
    padding: var(--spacing-xs) 0;
  }
  
  .nav__list {
    padding: 0 var(--spacing-sm);
  }
  
  .main {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  .meal-types {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
  }
  
  .meal-type {
    padding: var(--spacing-md);
  }
  
  .meal-type__icon {
    font-size: var(--font-size-2xl);
  }
  
  .step__actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .btn {
    width: 100%;
  }
  
  .food-items {
    grid-template-columns: 1fr;
  }
  
  .results-actions {
    flex-direction: column;
  }
  
  .achievements-grid {
    grid-template-columns: 1fr;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .toast-container {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    left: var(--spacing-sm);
  }
  
  .toast {
    max-width: none;
  }
}

@media (max-width: 480px) {
  .header {
    padding: var(--spacing-sm);
  }
  
  .header__title {
    font-size: var(--font-size-lg);
  }
  
  .main {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .people-counter {
    max-width: none;
  }
  
  .counter-group {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .modal__content {
    margin: var(--spacing-sm);
    max-height: calc(100vh - 2rem);
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --box-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
  }
  
  .btn {
    border: 2px solid currentColor;
  }
  
  .food-item,
  .meal-type {
    border-width: 2px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {
  .header,
  .nav,
  .footer,
  .btn,
  .modal,
  .toast-container,
  .loading {
    display: none !important;
  }
  
  .main {
    max-width: none;
    padding: 0;
  }
  
  .results {
    box-shadow: none;
    border: 1px solid #000;
  }
}