body {
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* Screen management */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateX(30px);
  pointer-events: none;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.screen.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.screen-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  padding-bottom: 20%;
  gap: var(--space-lg);
}

.screen-content-top {
  justify-content: flex-start;
  padding-top: var(--space-xl);
}

/* Buttons */
.btn-primary {
  background: var(--color-primary);
  color: white;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  min-height: 44px;
  width: 100%;
  max-width: 400px;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:active {
  transform: scale(0.96);
}

.btn-primary:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.btn-secondary {
  background: var(--color-surface-raised);
  color: var(--color-text);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  min-height: 44px;
  width: 100%;
  max-width: 400px;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-secondary:active {
  transform: scale(0.96);
}

.btn-icon {
  font-size: var(--font-size-xl);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
  color: var(--color-text-muted);
}

.btn-icon:active {
  transform: scale(0.9);
  background: var(--color-surface-raised);
}

/* Text input */
#username-input {
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 16px;
  text-align: center;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-surface-raised);
  width: 100%;
  max-width: 400px;
  min-height: 44px;
  transition: border-color var(--transition-fast);
}

#username-input:focus {
  border-color: var(--color-primary);
}

/* App header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  padding-top: env(safe-area-inset-top, var(--space-md));
}

.app-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

.app-title-small {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.subtitle {
  color: var(--color-text-muted);
}

/* Game header */
.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  padding-top: env(safe-area-inset-top, var(--space-sm));
}

.game-header-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

/* Game container */
.game-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

/* Game footer */
.game-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  padding-bottom: env(safe-area-inset-bottom, var(--space-md));
}

/* Game selection grid */
.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-md);
  width: 100%;
  max-width: 400px;
}

.game-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  transition: transform var(--transition-fast);
}

.game-card:active {
  transform: scale(0.92);
}

.game-card-icon {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.game-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.game-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Overlay */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 320px;
  width: 90%;
  transform: scale(1);
  transition: transform var(--transition-normal);
}

.overlay.hidden .overlay-content {
  transform: scale(0.9);
}

/* Timer */
.timer {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.move-counter {
  color: var(--color-text-muted);
  font-size: var(--font-size-md);
}

.win-title {
  font-size: var(--font-size-2xl);
  color: var(--color-success);
}

.win-stat {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
}

/* Spinner */
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-surface-raised);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 600ms linear infinite;
}

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

.user-badge {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}