/* ============================================
   FLASHCARD-OPTIONS.CSS
   Scoped arcade styles for Flashcard Options screen
   All colors via theme variables only — NO hex, rgb, hsl, or rgba values
   Hard edges, neon glows, Press Start 2P typography
   Touch targets ≥48px, full active/selected/disabled states
   Shares visual language with session-settings for consistency
   ============================================ */

.flashcard-options-screen {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding: var(--space-xl) var(--space-lg) calc(var(--space-xl) * 1.5);
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Screen Title — Arcade CRT style */
.flashcard-options-screen .screen-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  color: var(--color-accent);
  text-shadow: 0 0 10px var(--color-accent);
  text-align: center;
  margin: 0 0 var(--space-md);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.1;
}

.flashcard-options-screen .screen-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin: 0 0 var(--space-xl);
  letter-spacing: 0.03em;
}

/* Segmented Control — Master Deck / Unit Study (identical visual contract) */
.segmented-control {
  display: flex;
  width: 100%;
  max-width: 420px;
  margin: 0 auto var(--space-xl);
  border: 3px solid var(--color-primary);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: 0 0 10px var(--color-primary);
}

.segment-btn {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  min-height: 52px;
  background-color: transparent;
  border: none;
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color var(--transition-speed),
              color var(--transition-speed),
              box-shadow var(--transition-speed);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
}

.segment-btn + .segment-btn {
  border-left: 3px solid var(--color-primary);
}

.segment-btn.active,
.segment-btn.selected {
  background-color: var(--color-primary);
  color: var(--color-background);
  box-shadow: 0 0 14px var(--color-primary);
}

.segment-btn:active {
  transform: scale(0.985);
}

/* Unit Study Section */
.unit-study-section {
  margin-bottom: var(--space-xl);
}

.unit-study-section.hidden {
  display: none;
}

.unit-study-section .section-label {
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  text-align: center;
}

/* 4-Column Unit Grid — Equal width tiles, hard edges, neon selection */
.unit-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  max-width: 520px;
  margin: 0 auto var(--space-lg);
}

.unit-tile {
  position: relative;
  aspect-ratio: 1 / 1.05;
  min-height: 76px;
  background-color: var(--color-surface);
  border: 2px solid var(--color-text-muted);
  border-radius: var(--border-radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xs);
  cursor: pointer;
  transition: transform var(--transition-speed),
              border-color var(--transition-speed),
              box-shadow var(--transition-speed);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 0 4px var(--color-text-muted);
}

.unit-tile.selected {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent), 0 0 16px var(--color-accent);
  transform: translateY(-1px);
}

.unit-tile:active {
  transform: scale(0.96);
  box-shadow: 0 0 12px var(--color-primary);
}

.unit-tile.locked {
  opacity: 0.45;
  pointer-events: none;
  border-style: dashed;
  border-color: var(--color-text-muted);
}

/* Flashcard Mode Info Banner (optional instructional line) */
.flashcard-info {
  max-width: 420px;
  margin: 0 auto var(--space-lg);
  padding: var(--space-md);
  background-color: var(--color-surface);
  border: 2px solid var(--color-secondary);
  border-radius: var(--border-radius-sm);
  text-align: center;
}

.flashcard-info p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Start Button Container — pushed to bottom */
.start-button-container {
  margin-top: auto;
  padding-top: var(--space-lg);
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

.start-btn {
  width: 100%;
  min-height: 58px;
  padding: var(--space-lg) var(--space-xl);
  background-color: var(--color-primary);
  color: var(--color-background);
  border: 3px solid var(--color-primary);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 0 0 14px var(--color-primary), 0 0 28px var(--color-primary);
  transition: transform var(--transition-speed),
              box-shadow var(--transition-speed),
              background-color var(--transition-speed);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.start-btn:disabled,
.start-btn[disabled] {
  opacity: 0.32;
  pointer-events: none;
  box-shadow: none;
  background-color: var(--color-surface);
  border-color: var(--color-text-muted);
  color: var(--color-text-muted);
}

.start-btn:active:not(:disabled) {
  transform: scale(0.97);
  box-shadow: 0 0 22px var(--color-primary), 0 0 40px var(--color-primary);
}

/* Inline Validation Error — positioned near unit grid */
.validation-error {
  color: var(--color-incorrect);
  font-size: var(--font-size-sm);
  font-family: var(--font-body);
  text-align: center;
  min-height: 22px;
  margin: var(--space-sm) 0 var(--space-md);
  padding: 0 var(--space-md);
  letter-spacing: 0.02em;
}

/* Responsive refinements */
@media (min-width: 620px) {
  .flashcard-options-screen {
    max-width: 580px;
    margin: 0 auto;
    padding-top: calc(var(--space-xl) * 1.2);
  }

  .unit-grid {
    gap: var(--space-lg);
  }
}
.config-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}