/* ============================================
   SCREEN-SPECIFIC STYLES
   ============================================ */

/* Home Screen */
.home-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  animation: fadeIn var(--transition-base);
}

.home-header h1 {
  font-size: 32px;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--accent) 0%, #7C3AED 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-header p {
  font-size: 16px;
  color: var(--text-secondary);
}

.recent-scans,
.popular-items {
  margin-bottom: var(--spacing-2xl);
  animation: slideUp var(--transition-base);
  animation-delay: 0.1s;
  animation-fill-mode: both;
}

.popular-items {
  animation-delay: 0.2s;
}

/* Info Screen (add.html) */
.info-screen {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.info-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  animation: slideDown var(--transition-base);
}

.back-button {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--card-bg);
  box-shadow: var(--shadow-soft);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.back-button:hover {
  transform: translateX(-4px);
  box-shadow: var(--shadow-hover);
}

.info-image-container {
  width: 100%;
  max-width: 400px;
  margin: 0 auto var(--spacing-xl);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  animation: scaleIn var(--transition-base);
}

.info-image {
  width: 100%;
  height: auto;
  display: block;
}

.info-title-section {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  animation: slideUp var(--transition-base);
  animation-delay: 0.1s;
  animation-fill-mode: both;
}

.info-title {
  font-size: 28px;
  margin-bottom: var(--spacing-sm);
}

.info-brand {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.info-grades {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.grade-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.grade-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nutrition-section {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  animation: slideUp var(--transition-base);
  animation-delay: 0.2s;
  animation-fill-mode: both;
}

.nutrition-title {
  font-size: 20px;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.nutrition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.nutrition-item {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nutrition-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.nutrition-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-sm);
}

.nutrition-value {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
}

.nutrition-unit {
  font-size: 14px;
  color: var(--text-secondary);
  margin-left: var(--spacing-xs);
}

.action-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  margin-top: var(--spacing-2xl);
  animation: slideUp var(--transition-base);
  animation-delay: 0.3s;
  animation-fill-mode: both;
}

@media (max-width: 768px) {
  .action-buttons {
    flex-direction: column;
  }
  
  .info-grades {
    flex-direction: column;
    align-items: center;
  }
  
  .nutrition-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Alternatives Screen (alt.html) */
.alternatives-screen {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.alternatives-header {
  margin-bottom: var(--spacing-2xl);
  animation: slideDown var(--transition-base);
}

.alternatives-title {
  font-size: 28px;
  margin-bottom: var(--spacing-md);
}

.alternatives-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
}

.alternative-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  will-change: transform;
  animation: slideUp var(--transition-base);
}

.alternative-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.alternative-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background: var(--bg-primary);
}

.alternative-content {
  padding: var(--spacing-xl);
}

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

.alternative-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  flex: 1;
}

.alternative-brand {
  font-size: 14px;
  color: var(--text-secondary);
}

.alternative-grades {
  display: flex;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.alternative-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.alternative-stat {
  text-align: center;
}

.alternative-stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.alternative-stat-value {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.alternative-improvement {
  padding: var(--spacing-md);
  background: #ECFDF5;
  border-radius: var(--radius-md);
  border-left: 4px solid #10B981;
}

.alternative-improvement-title {
  font-size: 13px;
  font-weight: 600;
  color: #065F46;
  margin-bottom: var(--spacing-xs);
}

.alternative-improvement-text {
  font-size: 12px;
  color: #047857;
}

/* Barcode Scanner */
.scanner-container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.scanner-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: fadeIn var(--transition-base);
}

.scanner-video-container {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  background: #000;
  margin-bottom: var(--spacing-xl);
  animation: scaleIn var(--transition-base);
}

#scanner-video {
  width: 100%;
  display: block;
}

.scanner-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
}

.scanner-instructions {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  animation: slideUp var(--transition-base);
}

.scanner-instructions-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.scanner-instructions-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(245, 247, 250, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn var(--transition-base);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--bg-primary);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  margin-top: var(--spacing-lg);
  font-size: 16px;
  color: var(--text-secondary);
  text-align: center;
}