/* CSS Custom Properties */
:root {
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-surface-elevated: #1f2b4d;
  --color-text: #eef0f2;
  --color-text-muted: #8b8fa3;
  --color-primary: #4361ee;
  --color-primary-hover: #3651d4;
  --color-green: #10b981;
  --color-green-bg: rgba(16, 185, 129, 0.15);
  --color-yellow: #f59e0b;
  --color-yellow-bg: rgba(245, 158, 11, 0.15);
  --color-red: #ef4444;
  --color-red-bg: rgba(239, 68, 68, 0.15);
  --color-border: #2d3a5c;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
}

input, button, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* App Container */
#app {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* Screen Management */
.screen {
  display: none;
  height: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.screen.active {
  display: block;
}

.screen-content {
  padding: 24px 20px;
  padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* App Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.app-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

/* Icon Buttons */
.icon-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition);
}

.icon-btn:hover, .icon-btn:active {
  background: var(--color-surface-elevated);
}

.icon-btn svg {
  width: 24px;
  height: 24px;
}

/* PIN Screen */
#pin-screen .screen-content {
  justify-content: center;
  align-items: center;
  text-align: center;
}

#pin-screen h1 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.subtitle {
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.pin-display {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.pin-dot {
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-border);
  transition: all var(--transition);
}

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

.pin-error {
  height: 24px;
  color: var(--color-red);
  font-size: 0.875rem;
  margin-bottom: 16px;
}

.pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 280px;
}

.pin-btn {
  width: 72px;
  height: 72px;
  font-size: 1.5rem;
  font-weight: 500;
  background: var(--color-surface);
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
}

.pin-btn:hover:not(:disabled), .pin-btn:active:not(:disabled) {
  background: var(--color-surface-elevated);
  transform: scale(1.05);
}

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

.pin-delete {
  font-size: 1.75rem;
}

/* Queue Badge */
.queue-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--color-yellow-bg);
  color: var(--color-yellow);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.queue-badge.hidden {
  display: none;
}

/* Mode Selection */
.mode-buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
  justify-content: center;
  margin-bottom: 24px;
}

.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 24px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
}

.mode-btn:hover, .mode-btn:active {
  border-color: var(--color-primary);
  background: var(--color-surface-elevated);
}

.mode-btn svg {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
}

.mode-btn span {
  font-size: 1.125rem;
  font-weight: 600;
}

.mode-btn small {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Personal Best Display */
.personal-best-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.personal-best-display strong {
  color: var(--color-text);
  font-size: 1.125rem;
}

/* Buttons */
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

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

.primary-btn.full-width {
  width: 100%;
}

.primary-btn svg {
  width: 20px;
  height: 20px;
}

.secondary-btn {
  padding: 14px 28px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.secondary-btn:hover, .secondary-btn:active {
  border-color: var(--color-primary);
  background: var(--color-surface-elevated);
}

.text-btn {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  padding: 8px 12px;
}

.text-btn:hover {
  text-decoration: underline;
}

/* Camera Screen */
.camera-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
}

.camera-preview {
  flex: 1;
  min-height: 300px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.camera-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.camera-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--color-text-muted);
}

.camera-placeholder svg {
  width: 64px;
  height: 64px;
  opacity: 0.5;
}

.camera-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.hidden {
  display: none !important;
}

/* Processing Indicator */
.processing-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 32px;
  color: var(--color-text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Manual Entry Form */
.entry-form {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
  padding: 16px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.pef-input-group input {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  padding: 24px;
}

.entry-form .primary-btn {
  margin-top: auto;
}

/* Result Screen */
.result-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
}

.zone-indicator {
  padding: 48px;
  border-radius: var(--radius-lg);
  min-width: 200px;
}

.zone-indicator.green {
  background: var(--color-green-bg);
  color: var(--color-green);
}

.zone-indicator.yellow {
  background: var(--color-yellow-bg);
  color: var(--color-yellow);
}

.zone-indicator.red {
  background: var(--color-red-bg);
  color: var(--color-red);
}

.zone-value {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1;
}

.zone-unit {
  font-size: 1rem;
  opacity: 0.8;
  margin-top: 8px;
}

.zone-message {
  font-size: 1.25rem;
  font-weight: 600;
}

.zone-percentage {
  font-size: 1rem;
  color: var(--color-text-muted);
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
}

/* History Screen */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  padding: 48px 24px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.history-zone {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
}

.history-zone.green {
  background: var(--color-green-bg);
  color: var(--color-green);
}

.history-zone.yellow {
  background: var(--color-yellow-bg);
  color: var(--color-yellow);
}

.history-zone.red {
  background: var(--color-red-bg);
  color: var(--color-red);
}

.history-details {
  flex: 1;
}

.history-value {
  font-size: 1.25rem;
  font-weight: 600;
}

.history-time {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.history-notes {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 4px;
}

.history-percentage {
  font-size: 0.875rem;
  font-weight: 500;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.modal-content {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 100%;
  max-width: 360px;
  box-shadow: var(--shadow);
}

.modal-content h3 {
  margin-bottom: 8px;
}

.modal-content p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 20px;
}

.modal-content input {
  width: 100%;
  padding: 16px;
  background: var(--color-surface-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 20px;
}

.modal-content input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Responsive adjustments */
@media (min-width: 600px) {
  .screen-content {
    max-width: 480px;
    margin: 0 auto;
  }

  .mode-buttons {
    flex-direction: row;
  }

  .mode-btn {
    flex: 1;
  }
}

/* Safe area padding for notched devices */
@supports (padding-top: env(safe-area-inset-top)) {
  .screen-content {
    padding-top: calc(24px + env(safe-area-inset-top));
  }
}