/**
 * Memorization Mode - Complete Design System
 */

.session-start,
.session-summary,
.empty-state {
  max-width: var(--container-3xl);
  margin: 0 auto;
  text-align: center;
  padding: var(--space-section-sm) var(--space-6);
}

.session-start,
.session-summary {
  background: var(--bg-card);
  border: var(--border-width-1) solid var(--border);
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(42, 95, 92, 0.06);
}

.session-stats,
.summary-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
  margin: var(--space-10) 0;
}

.stat-card {
  background: var(--bg-card);
  border: var(--border-width-1) solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-card-md);
  box-shadow: 0 2px 8px rgba(42, 95, 92, 0.06);
}

.stat-number {
  display: block;
  font-size: var(--text-display-lg);
  line-height: var(--leading-none);
  font-weight: var(--font-weight-bold);
  color: var(--teal-700);
  margin-bottom: var(--space-2);
}

.stat-label {
  display: block;
  font-size: var(--text-sm);
  font-variant: small-caps;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  font-weight: var(--font-weight-semibold);
}

/* Flashcard */
.flashcard-container {
  perspective: 1200px;
  -webkit-perspective: 1200px;
  width: min(100%, var(--container-4xl));
  margin: var(--space-section-sm) auto var(--space-10);
  min-height: 34rem;
}

.flashcard {
  position: relative;
  width: 100%;
  height: 34rem;
  border: var(--border-width-2) solid var(--teal-dark);
  border-radius: 20px;
  overflow: hidden;
  box-shadow:
    0 8px 24px var(--shadow-color-lg),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: box-shadow var(--duration-normal) var(--ease-in-out);
  cursor: pointer;
}

.flashcard.flipped {
  box-shadow:
    0 10px 28px var(--shadow-color-lg),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-card-xl);
  border-radius: inherit;
  transition:
    opacity var(--duration-normal) var(--ease-in-out),
    transform var(--duration-normal) var(--ease-in-out);
  box-shadow: none;
  border: none;
}

.card-front {
  display: flex;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  z-index: 2;
  background: linear-gradient(145deg, var(--bg-card), var(--bg-subtle));
}

.card-front .arabic-text {
  font-family: var(--font-arabic);
  font-size: var(--text-arabic-hero);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-arabic);
  color: var(--gold-dark);
  text-shadow: 0 1px 2px rgba(184, 134, 11, 0.15);
  margin-bottom: var(--space-6);
  direction: rtl;
  unicode-bidi: embed;
}

.card-front .tap-prompt {
  color: var(--text-tertiary);
  font-size: var(--text-base);
  margin-top: var(--space-6);
}

.card-front .tap-icon {
  width: 2.75rem;
  height: 2.75rem;
  margin: var(--space-4) auto;
  opacity: 0.45;
  animation: pulse-tap 2s ease-in-out infinite;
}

@keyframes pulse-tap {
  0%, 100% { transform: scale(1); opacity: 0.35; }
  50% { transform: scale(1.08); opacity: 0.7; }
}

.card-back {
  display: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  z-index: 0;
  background: linear-gradient(135deg, var(--teal-softest) 0%, var(--bg-card) 100%);
}

.flashcard.flipped .card-front {
  display: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  z-index: 0;
}

.flashcard.flipped .card-back {
  display: flex;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  z-index: 2;
}

.card-back .transliteration {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-tight);
  color: var(--teal-darker);
  margin-bottom: var(--space-4);
}

.card-back .meaning {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

.card-back .context {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 34rem;
}

/* Assessments */
.assessment-buttons {
  width: min(100%, 500px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

@media (min-width: 700px) {
  .assessment-buttons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.assessment-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 7rem;
  padding: var(--space-8);
  border-radius: 12px;
  border: var(--border-width-2) solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.assessment-btn .emoji {
  display: block;
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

.assessment-btn .label {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
}

.assessment-btn .interval {
  display: block;
  font-size: var(--text-sm);
  color: var(--text-quaternary);
}

.assessment-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.assessment-btn:active {
  transform: scale(0.95);
  transition: transform 100ms cubic-bezier(0.4, 0, 0.6, 1);
}

.assessment-btn.forgot {
  border-color: var(--red-light);
  color: var(--red);
}

.assessment-btn.forgot:hover {
  background: var(--red-softest);
  border-color: var(--red);
}

.assessment-btn.hard {
  border-color: var(--orange-light);
  color: var(--orange);
}

.assessment-btn.hard:hover {
  background: var(--orange-softest);
  border-color: var(--orange);
}

.assessment-btn.good {
  border-color: var(--teal-light);
  color: var(--teal-500);
}

.assessment-btn.good:hover {
  background: var(--teal-softest);
  border-color: var(--teal-500);
}

.assessment-btn.easy {
  border-color: var(--green-light);
  color: var(--green);
}

.assessment-btn.easy:hover {
  background: var(--green-softest);
  border-color: var(--green);
}

/* Progress */
.session-progress {
  text-align: center;
  margin-bottom: var(--space-8);
}

.progress-text {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  font-variant: small-caps;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-3);
}

.progress-bar {
  width: min(100%, var(--container-4xl));
  height: 0.75rem;
  margin: 0 auto;
  background: var(--teal-100);
  border-radius: var(--border-radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal-500), var(--teal-700));
  border-radius: inherit;
  transition: width var(--duration-slow) var(--ease-out);
}

.summary-title,
.empty-state-title {
  color: var(--teal-700);
  margin-bottom: var(--space-4);
}

.summary-icon,
.empty-state-icon {
  font-size: var(--text-display-lg);
  margin-bottom: var(--space-5);
}

.summary-encouragement,
.empty-state-text {
  color: var(--text-tertiary);
  font-size: var(--text-lg);
  margin: var(--space-6) auto;
  max-width: var(--container-2xl);
}

.summary-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

@media (max-width: 700px) {
  .session-start,
  .session-summary,
  .empty-state {
    padding: var(--space-12) var(--space-4);
  }

  .flashcard-container {
    min-height: 28rem;
    margin: var(--space-10) auto var(--space-8);
  }

  .flashcard {
    height: 28rem;
  }

  .card-face {
    padding: var(--space-8);
  }

  .card-front .arabic-text {
    font-size: clamp(4rem, 18vw, 7rem);
  }

  .assessment-btn {
    min-height: 7rem;
    padding: var(--space-5) var(--space-3);
  }

  .assessment-btn .emoji {
    font-size: 2rem;
  }
}

/* ---------- Touch: no sticky hover transform on assessment buttons ---------- */
@media (hover: none) {
  .assessment-btn:hover {
    transform: none;
  }
  .assessment-btn:active {
    transform: scale(0.98);
  }
}

/* ---------- Phones / short screens: fit the card, scroll long content ---------- */
@media (max-width: 640px), (max-height: 700px) {
  .flashcard {
    height: min(34rem, calc(100dvh - 10rem));
    min-height: 20rem;
  }
  .card-face {
    justify-content: safe center; /* falls back to top-aligned when overflowing */
    overflow-y: auto;
    overscroll-behavior: contain;
  }
}