/* ====================================
   DietAria - Material Design 3
   Sober Dark Theme with Gradient
   ==================================== */

:root {
  /* M3 Color System - Neutral Pink */
  --primary: #f2b8c6;
  --on-primary: #4a1c2b;
  --primary-container: #633b47;
  --on-primary-container: #ffd9e1;
  
  --surface: #141114;
  --surface-variant: #1e1a1b;
  --on-surface: #e7e1e1;
  --on-surface-variant: #cac4c5;
  --outline: #938f8f;
  --outline-variant: #453f40;
  
  /* Subtle semantic colors */
  --tertiary: #d4c4a1;
  --tertiary-container: #3d3425;
  --on-tertiary-container: #f0e5c7;
  
  --error: #f2b8bc;
  --error-container: #8c1d2d;
  
  /* Gradient backgrounds */
  --gradient-surface: linear-gradient(168deg, #1a1517 0%, #141114 50%, #12101a 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%);
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  
  /* M3 Shape */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;
}

/* ====================================
   Base
   ==================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Roboto', system-ui, -apple-system, sans-serif;
  background: var(--gradient-surface);
  background-attachment: fixed;
  color: var(--on-surface);
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh;
  padding-bottom: 72px;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::-webkit-scrollbar {
  width: 0;
  height: 0;
}

/* ====================================
   Header
   ==================================== */

.header {
  background: rgba(20, 17, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-md) var(--space-lg) var(--space-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--outline-variant);
}

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

.header h1 {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--on-surface);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  letter-spacing: 0;
}

.header-icon {
  width: 24px;
  height: 24px;
  border-radius: 6px;
}

.version-badge {
  background: var(--surface-variant);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  letter-spacing: 0.02em;
}

.header-stats {
  display: flex;
  gap: var(--space-sm);
}

.stat-pill {
  background: var(--surface-variant);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--on-surface-variant);
}

.stat-pill strong {
  font-weight: 600;
  color: var(--primary);
}

/* ====================================
   Navigation
   ==================================== */

.nav-tabs {
  display: flex;
  padding: var(--space-xs) var(--space-lg);
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  background: rgba(20, 17, 20, 0.5);
  border-bottom: 1px solid var(--outline-variant);
}

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

.nav-tab {
  flex: 1;
  min-width: fit-content;
  padding: 10px 14px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.nav-tab:hover {
  background: rgba(255, 255, 255, 0.04);
}

.nav-tab.active {
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-weight: 600;
}

/* ====================================
   Content
   ==================================== */

.content {
  padding: var(--space-md) var(--space-lg);
  max-width: 540px;
  margin: 0 auto;
}

.section {
  display: none;
}

.section.active {
  display: block;
  animation: fadeIn 0.15s ease-out;
}

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

/* ====================================
   Day Selector
   ==================================== */

.day-selector {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: var(--space-md);
  scrollbar-width: none;
}

.day-selector::-webkit-scrollbar {
  display: none;
}

.day-btn {
  position: relative;
  min-width: 48px;
  height: 48px;
  border: 1px solid var(--outline-variant);
  background: transparent;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
}

.day-btn:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--outline);
}

.day-btn .emoji {
  font-size: 1rem;
}

.day-btn.active {
  background: var(--primary-container);
  border-color: var(--primary-container);
  color: var(--on-primary-container);
}

.day-btn.schiscetta::after {
  content: '🧳';
  font-size: 0.5rem;
  position: absolute;
  top: 2px;
  right: 2px;
}

/* ====================================
   Day Info
   ==================================== */

.day-info {
  background: var(--gradient-card);
  border: 1px solid var(--outline-variant);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.day-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--on-surface);
}

.day-info .stats {
  display: flex;
  gap: var(--space-lg);
  font-size: 0.75rem;
  color: var(--on-surface-variant);
}

.day-info .stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.day-info .schiscetta-badge {
  margin-top: var(--space-xs);
  font-size: 0.7rem;
  color: var(--tertiary);
}

/* ====================================
   Cards
   ==================================== */

.card {
  background: var(--gradient-card);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
}

.card-header {
  padding: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--outline-variant);
}

.card-header h2 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--on-surface);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card-header .badge {
  background: var(--primary-container);
  color: var(--on-primary-container);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 600;
}

.card-body {
  padding: var(--space-md);
}

/* ====================================
   Meal Cards
   ==================================== */

.meal-card .card-header {
  cursor: pointer;
  transition: background 0.15s ease;
}

.meal-card .card-header:active {
  background: rgba(255, 255, 255, 0.02);
}

.meal-header-content {
  flex: 1;
}

.meal-header-content h2 {
  margin-bottom: 2px;
}

.meal-macros {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--on-surface-variant);
}

/* Pranzo */
.meal-card.pranzo .card-header {
  border-left: 2px solid var(--tertiary);
}

.meal-card.pranzo .card-header h2 {
  color: var(--tertiary);
}

/* Cena */
.meal-card.cena .card-header {
  border-left: 2px solid #b8a5d4;
}

.meal-card.cena .card-header h2 {
  color: #b8a5d4;
}

/* ====================================
   Food Items
   ==================================== */

.food-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.food-name {
  font-weight: 500;
  color: var(--on-surface);
  flex: 1;
  padding-right: var(--space-md);
  font-size: 0.8rem;
}

.food-qty {
  color: var(--primary);
  font-weight: 600;
  text-align: right;
  font-size: 0.75rem;
  white-space: nowrap;
}

/* ====================================
   Notes
   ==================================== */

.prep-note {
  background: rgba(212, 196, 161, 0.08);
  border-left: 2px solid var(--tertiary);
  padding: var(--space-sm) var(--space-md);
  margin-top: var(--space-sm);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.75rem;
  color: var(--on-tertiary-container);
}

.prep-note strong {
  font-weight: 600;
}

.warning-note {
  background: rgba(242, 184, 188, 0.08);
  border-left: 2px solid var(--error);
  padding: var(--space-sm) var(--space-md);
  margin-top: var(--space-sm);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.75rem;
  color: var(--error);
}

.day-note {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
}

/* ====================================
   Options Grid
   ==================================== */

.options-grid {
  display: grid;
  gap: var(--space-sm);
}

.option-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
}

.option-title {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-sm);
  font-size: 0.8rem;
}

/* ====================================
   Snack List
   ==================================== */

.snack-list {
  display: grid;
  gap: 6px;
}

.snack-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-sm);
}

.snack-item .name {
  font-weight: 500;
  flex: 1;
  font-size: 0.8rem;
}

.snack-item .details {
  text-align: right;
  font-size: 0.7rem;
}

.snack-item .kcal {
  color: var(--primary);
  font-weight: 600;
}

.snack-item .carb {
  color: var(--on-surface-variant);
}

/* ====================================
   Tables
   ==================================== */

.table-container {
  padding: 0;
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
}

.ref-table th {
  background: rgba(255, 255, 255, 0.02);
  color: var(--on-surface);
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.02em;
}

.ref-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.8rem;
  color: var(--on-surface-variant);
}

.ref-table tr:last-child td {
  border-bottom: none;
}

/* ====================================
   Aperitivo Card
   ==================================== */

.aperitivo-card {
  background: var(--gradient-card);
  border: 1px solid var(--error);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
}

.aperitivo-card h3 {
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
  color: var(--error);
  font-weight: 600;
}

.aperitivo-card ul {
  list-style: none;
  padding: 0;
}

.aperitivo-card li {
  padding: var(--space-sm) 0;
  padding-left: 22px;
  position: relative;
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.aperitivo-card li:last-child {
  border-bottom: none;
}

.aperitivo-card li::before {
  content: '🍷';
  position: absolute;
  left: 0;
  font-size: 0.75rem;
}

.aperitivo-card .ref-table {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: var(--space-md);
}

.compensazioni-title {
  margin: var(--space-md) 0 var(--space-sm);
  font-size: 0.8rem;
  color: var(--on-surface);
  font-weight: 600;
}

/* ====================================
   Notes List
   ==================================== */

.notes-list {
  list-style: none;
}

.notes-list li {
  padding: var(--space-sm) 0;
  padding-left: 24px;
  position: relative;
  color: var(--on-surface-variant);
  font-size: 0.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.notes-list li:last-child {
  border-bottom: none;
}

.notes-list li::before {
  content: '💡';
  position: absolute;
  left: 0;
  top: var(--space-sm);
  font-size: 0.8rem;
}

.notes-list.diabetes li::before {
  content: '💉';
}

/* ====================================
   Info Footer
   ==================================== */

.info-footer {
  text-align: center;
  color: var(--on-surface-variant);
  padding: var(--space-lg);
  font-size: 0.75rem;
}

.info-footer p {
  margin: 2px 0;
}

.info-footer .heart {
  color: var(--primary);
}

.info-footer .credits {
  margin-top: var(--space-sm);
  opacity: 0.7;
}

/* ====================================
   Update Banner
   ==================================== */

.update-banner {
  display: none;
  position: fixed;
  bottom: var(--space-lg);
  left: var(--space-lg);
  right: var(--space-lg);
  max-width: 360px;
  margin: 0 auto;
  background: var(--primary-container);
  color: var(--on-primary-container);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  z-index: 1000;
  animation: slideUp 0.25s ease-out;
}

.update-banner.show {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}

.update-banner span {
  font-weight: 500;
  font-size: 0.85rem;
}

.update-banner button {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-xl);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
}

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

/* ====================================
   Loading
   ==================================== */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px var(--space-lg);
  color: var(--on-surface-variant);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--outline-variant);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-bottom: var(--space-md);
}

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

/* ====================================
   Offline Badge
   ==================================== */

.offline-badge {
  display: none;
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 500;
}

body.offline .offline-badge {
  display: inline-flex;
}

/* ====================================
   Collapsible
   ==================================== */

.collapsible-header {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.collapsible-header::after {
  content: '›';
  font-size: 1.1rem;
  color: var(--on-surface-variant);
  transform: rotate(90deg);
  transition: transform 0.2s ease;
}

.collapsible-header.collapsed::after {
  transform: rotate(0deg);
}

.collapsible-content {
  max-height: 2000px;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.collapsible-content.collapsed {
  max-height: 0;
}

/* ====================================
   Responsive
   ==================================== */

@media (min-width: 600px) {
  .options-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .day-selector {
    justify-content: center;
    flex-wrap: wrap;
  }
}

/* ====================================
   Safe Area
   ==================================== */

@supports (padding-top: env(safe-area-inset-top)) {
  .header {
    padding-top: calc(var(--space-md) + env(safe-area-inset-top));
  }

  body {
    padding-bottom: calc(72px + env(safe-area-inset-bottom));
  }

  .update-banner {
    bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
  }
}