/* ================================
   GroceryScout Design System
   ================================ */

/* --- Design Tokens --- */
:root {
  /* Colors - Primary */
  --color-primary: #10b981;
  --color-primary-light: #34d399;
  --color-primary-dark: #059669;
  --color-primary-bg: #ecfdf5;
  
  /* Colors - Semantic */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Colors - Neutral */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  
  /* Effects */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

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

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

/* --- App Container --- */
.app {
  max-width: 480px;
  margin: 0 auto;
  background: var(--color-bg);
  min-height: 100vh;
  position: relative;
}

/* --- Header --- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo {
  font-size: 1.5rem;
}

.app-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.user-xp {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.xp-badge {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-warning);
}

.rank-badge {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.btn-icon {
  position: relative;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: var(--transition-fast);
}

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

.notification-dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-error);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-surface);
}

/* --- Search Section --- */
.search-section {
  padding: var(--space-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.search-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-sm) var(--space-md);
  transition: var(--transition-fast);
}

.search-bar:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-bg);
}

.search-icon {
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.search-bar input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: var(--font-size-md);
  color: var(--color-text);
  outline: none;
}

.search-bar input::placeholder {
  color: var(--color-text-muted);
}

.btn-scan {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

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

.location-bar {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.btn-text {
  border: none;
  background: none;
  color: var(--color-primary);
  font-weight: 500;
  cursor: pointer;
  padding: 0;
  margin-left: var(--space-xs);
}

/* --- Navigation Tabs --- */
.nav-tabs {
  display: flex;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 65px;
  z-index: 99;
}

.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-xs);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  border-bottom: 2px solid transparent;
}

.nav-tab:hover {
  color: var(--color-text-secondary);
}

.nav-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* --- Main Content --- */
.main-content {
  padding-bottom: var(--space-xl);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* --- Section --- */
.section {
  padding: var(--space-md);
}

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

.section-header h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
}

.badge-alert {
  background: #fef2f2;
  color: var(--color-error);
}

/* --- Product Cards (Horizontal Scroll) --- */
.product-scroll {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding-bottom: var(--space-sm);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.product-scroll::-webkit-scrollbar {
  display: none;
}

.product-card {
  flex-shrink: 0;
  width: 140px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
}

.product-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.product-card.trending {
  border-color: var(--color-error);
  background: #fef2f2;
}

.product-image {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: var(--space-sm);
}

.product-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.product-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.product-price-range {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.trending-badge {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--color-error);
  font-weight: 600;
}

/* --- Price Chart --- */
.price-chart-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

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

.chart-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.chart-legend {
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
}

.legend-item.lowest {
  color: var(--color-primary);
}

.legend-item.average {
  color: var(--color-text-muted);
}

.price-chart {
  height: 120px;
  display: flex;
  align-items: flex-end;
  gap: 4px;
}

.chart-bar {
  flex: 1;
  background: linear-gradient(to top, var(--color-primary-light), var(--color-primary-bg));
  border-radius: 3px 3px 0 0;
  min-height: 10px;
  transition: var(--transition-normal);
}

.chart-bar:hover {
  background: var(--color-primary);
}

/* --- Store List --- */
.store-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.store-card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: var(--space-xs) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: var(--transition-fast);
}

.store-card:hover {
  border-color: var(--color-primary-light);
}

.store-card.best-price {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.store-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.store-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: white;
}

.store-logo.walmart { background: #0071dc; }
.store-logo.publix { background: #3e8f3e; }
.store-logo.aldi { background: #00005f; }
.store-logo.target { background: #cc0000; }
.store-logo.costco { background: #e31837; }

.store-details {
  display: flex;
  flex-direction: column;
}

.store-name {
  font-weight: 600;
  font-size: var(--font-size-md);
}

.store-distance {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.store-price {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
}

.store-price .price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

.price-badge {
  font-size: var(--font-size-xs);
  padding: 2px var(--space-sm);
  border-radius: var(--radius-full);
  font-weight: 600;
}

.price-badge.best {
  background: var(--color-primary);
  color: white;
}

.price-note {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.store-meta {
  grid-column: 1 / -1;
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --- Button Alert --- */
.btn-alert {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-alert:hover {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

/* --- Shopping List Tab --- */
.list-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

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

.summary-card.savings {
  background: var(--color-primary-bg);
  border-color: var(--color-primary);
}

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

.summary-value {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.savings .summary-value {
  color: var(--color-primary);
}

.optimization-toggle {
  display: flex;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: var(--space-md);
}

.opt-btn {
  flex: 1;
  padding: var(--space-sm);
  border: none;
  background: transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

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

.optimized-result {
  margin-bottom: var(--space-md);
}

.best-store {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.best-store .store-name {
  font-weight: 600;
}

.best-store .store-total {
  font-size: var(--font-size-sm);
  color: var(--color-primary-dark);
}

/* --- Shopping List Items --- */
.shopping-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.list-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.list-item input[type="checkbox"] {
  display: none;
}

.list-item label {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  cursor: pointer;
  transition: var(--transition-fast);
}

.list-item input:checked + label {
  background: var(--color-bg);
  text-decoration: line-through;
  opacity: 0.6;
}

.item-emoji {
  font-size: 1.5rem;
}

.item-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.item-name {
  font-weight: 500;
}

.item-best {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
}

.item-price {
  font-weight: 600;
  color: var(--color-text);
}

/* --- Report Price Tab --- */
.xp-banner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.xp-icon {
  font-size: 2rem;
}

.xp-title {
  font-weight: 600;
  color: var(--color-text);
}

.xp-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.report-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-group.optional label::after {
  content: " (optional)";
  font-weight: 400;
  color: var(--color-text-muted);
}

.input-with-icon {
  display: flex;
  gap: var(--space-sm);
}

.input-with-icon input {
  flex: 1;
}

.form-group input,
.form-group select {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  transition: var(--transition-fast);
}

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

.btn-icon-sm {
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: var(--transition-fast);
}

.btn-icon-sm:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.price-input {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  transition: var(--transition-fast);
}

.price-input:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-bg);
}

.price-input .currency {
  padding: var(--space-md);
  background: var(--color-bg);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.price-input input {
  flex: 1;
  border: none;
  padding: var(--space-md);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.price-input input:focus {
  outline: none;
  box-shadow: none;
}

.toggle-group {
  display: flex;
  gap: var(--space-sm);
}

.toggle-btn {
  flex: 1;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.toggle-btn:hover {
  border-color: var(--color-primary-light);
}

.toggle-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
  color: var(--color-primary-dark);
}

.photo-upload {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xl);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
}

.photo-upload:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border: none;
  background: var(--color-primary);
  color: white;
  font-size: var(--font-size-md);
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
}

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

.btn-large {
  padding: var(--space-lg);
  font-size: var(--font-size-lg);
}

.btn-xp {
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
}

.btn-secondary {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
}

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

/* --- Profile Tab --- */
.profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.avatar {
  width: 64px;
  height: 64px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.profile-info h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.member-since {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

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

.stat-value {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

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

/* --- Badges Section --- */
.badges-section,
.rank-section,
.activity-section {
  margin-bottom: var(--space-lg);
}

.badges-section h3,
.rank-section h3,
.activity-section h3 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

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

.badge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
}

.badge-item.earned {
  background: var(--color-primary-bg);
  border-color: var(--color-primary);
}

.badge-item.locked {
  opacity: 0.4;
}

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

.badge-name {
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* --- Rank Progress --- */
.rank-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.rank-current,
.rank-next {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

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

.rank-name {
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.rank-progress {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

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

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.progress-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
}

/* --- Activity Section --- */
.activity-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.activity-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

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

.activity-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.activity-text {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.activity-xp {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
}

.activity-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --- Responsive --- */
@media (max-width: 480px) {
  .app {
    max-width: 100%;
  }
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.section {
  animation: fadeIn 0.3s ease;
}