:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1f2b47;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --accent: #4facfe;
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success: #00d97e;
  --warning: #f5a623;
  --danger: #ff6b6b;
  --border-radius: 12px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
}

.screen {
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.hidden {
  display: none !important;
}

/* PIN Auth Screen */
.auth-container {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.auth-container h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.pin-display {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.pin-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--text-secondary);
  transition: all 0.2s ease;
}

.pin-dot.filled {
  background: var(--accent);
  border-color: var(--accent);
}

.pin-error {
  height: 24px;
  color: var(--danger);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  max-width: 280px;
  width: 100%;
}

.pin-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: none;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.pin-btn:active:not(:disabled) {
  background: var(--accent);
  transform: scale(0.95);
}

.pin-btn:disabled {
  visibility: hidden;
}

.pin-delete {
  color: var(--text-secondary);
}

/* App Screen */
#app-screen {
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

.app-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

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

.icon-btn {
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

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

.queue-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--warning);
  color: #000;
  border: none;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}

.queue-btn svg {
  animation: spin 2s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Views */
.view {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Camera View */
.camera-container {
  flex: 1;
  position: relative;
  background: #000;
  overflow: hidden;
}

#camera-feed {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.capture-frame {
  width: 80%;
  aspect-ratio: 4/3;
  max-height: 70%;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--border-radius);
}

.camera-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
}

.capture-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 4px solid var(--text-primary);
  background: transparent;
  cursor: pointer;
  padding: 4px;
  transition: all 0.2s ease;
}

.capture-btn:active {
  transform: scale(0.95);
}

.capture-inner {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--text-primary);
  transition: background 0.2s ease;
}

.capture-btn:active .capture-inner {
  background: var(--accent);
}

.upload-btn, .switch-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.upload-btn:active, .switch-btn:active {
  background: rgba(255, 255, 255, 0.2);
}

/* Analysis View */
.analysis-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.preview-image {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
}

.analysis-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-card);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
}

.analysis-result {
  animation: fadeIn 0.3s ease;
}

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

.food-name {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.fodmap-alerts {
  background: rgba(255, 107, 107, 0.15);
  border: 1px solid var(--danger);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.fodmap-alerts h3 {
  color: var(--danger);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.fodmap-alerts h3::before {
  content: "!";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--danger);
  color: white;
  border-radius: 50%;
  font-size: 0.75rem;
}

.fodmap-alerts ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.fodmap-alerts li {
  background: rgba(255, 107, 107, 0.2);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.875rem;
}

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

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

.nutrition-item.calories {
  grid-column: span 2;
  background: var(--accent-gradient);
}

.nutrition-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
}

.calories .nutrition-value {
  font-size: 2.5rem;
}

.nutrition-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.calories .nutrition-label {
  color: rgba(255, 255, 255, 0.8);
}

.analysis-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.primary-btn {
  width: 100%;
  padding: var(--spacing-md);
  border: none;
  border-radius: var(--border-radius);
  background: var(--accent-gradient);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.primary-btn:active {
  transform: scale(0.98);
  opacity: 0.9;
}

.secondary-btn {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--text-secondary);
  border-radius: var(--border-radius);
  background: transparent;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.secondary-btn:active {
  background: rgba(255, 255, 255, 0.1);
}

.analysis-error {
  text-align: center;
  padding: var(--spacing-lg);
}

.analysis-error p {
  color: var(--danger);
  margin-bottom: var(--spacing-lg);
}

.analysis-error button {
  margin-bottom: var(--spacing-md);
}

/* History View */
.history-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.history-header h2 {
  flex: 1;
  font-size: 1.25rem;
}

.history-summary {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 600;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

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

.history-item {
  display: flex;
  gap: var(--spacing-md);
  background: var(--bg-card);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.history-item img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
}

.history-item-content {
  flex: 1;
  min-width: 0;
}

.history-item-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.history-item-macros {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.75rem;
}

.history-item-macros span {
  color: var(--text-secondary);
}

.history-item-macros strong {
  color: var(--text-primary);
}

.history-item-fodmap {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(255, 107, 107, 0.2);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--danger);
  display: inline-block;
}

.history-date-header {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: var(--spacing-lg) 0 var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.history-date-header:first-child {
  margin-top: 0;
}

/* Utility */
@media (min-width: 480px) {
  .pin-pad {
    max-width: 320px;
  }

  .pin-btn {
    width: 80px;
    height: 80px;
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6e6e80;
  }

  .pin-btn {
    background: #e5e5e7;
  }

  .upload-btn, .switch-btn {
    background: rgba(0, 0, 0, 0.05);
  }

  .history-item, .nutrition-item {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  }
}

/* Safe area insets for notched devices */
@supports (padding-top: env(safe-area-inset-top)) {
  .app-header {
    padding-top: calc(var(--spacing-md) + env(safe-area-inset-top));
  }

  .camera-controls {
    padding-bottom: calc(var(--spacing-lg) + env(safe-area-inset-bottom));
  }

  .analysis-container, .history-list {
    padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
  }
}