/**
 * Kahu English Learning Module Stylesheet
 * Responsive, accessible, hardware-accelerated animations, minimum 44px touch targets.
 */

/* ==========================================================================
   1. Hub & Topic Directory Styles
   ========================================================================== */
.english-hero {
  background: linear-gradient(135deg, #064e3b 0%, #065f46 45%, #047857 100%);
  color: #ffffff;
  padding: 3rem 0 3.25rem;
  position: relative;
  overflow: hidden;
}

.english-hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.english-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  color: #a7f3d0;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.english-stats-banner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: -1.75rem;
  margin-bottom: 2rem;
  position: relative;
  z-index: 2;
}

@media (max-width: 900px) {
  .english-stats-banner {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
}

@media (max-width: 640px) {
  .english-stats-banner {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.65rem;
    margin-top: -1rem;
    margin-bottom: 1.5rem;
  }

  .english-stat-card {
    padding: 0.85rem 0.95rem;
    gap: 0.65rem;
  }

  .english-stat-icon {
    width: 38px;
    height: 38px;
  }

  .english-stat-icon svg {
    width: 20px;
    height: 20px;
  }

  .english-stat-val {
    font-size: 1.2rem;
  }

  .english-stat-lbl {
    font-size: 0.72rem;
  }
}

.english-stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.15rem 1.35rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.85rem;
  transition: transform var(--transition-fast);
}

.english-stat-card:hover {
  transform: translateY(-2px);
}

.english-stat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.english-stat-val {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.15;
}

.english-stat-lbl {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Topic Grid */
.english-topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.5rem;
}

.english-topic-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
}

.english-topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #059669;
}

.topic-card-top {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.topic-cover-wrap {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  background: #f0fdf4;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  border: 1px solid #bbf7d0;
}

.topic-cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-header-info {
  flex: 1;
}

.topic-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.topic-title-en {
  font-size: 0.88rem;
  font-weight: 600;
  color: #059669;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.topic-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.topic-progress-wrap {
  margin-bottom: 1.25rem;
}

.topic-progress-bar {
  height: 7px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.topic-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #059669);
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
}

.topic-progress-lbl {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}

.topic-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

/* Review Section on Hub */
.english-review-section {
  background: #f8fafc;
  border: 1.5px dashed #cbd5e1;
  border-radius: var(--radius-xl);
  padding: 1.75rem 2rem;
  margin-bottom: 2.5rem;
}

.review-badge {
  background: #fef3c7;
  color: #92400e;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

/* ==========================================================================
   2. Flashcard Mode Styles
   ========================================================================== */
.flashcard-stage {
  max-width: 720px;
  margin: 0 auto;
}

.flashcard-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.flashcard-container {
  perspective: 1000px;
  min-height: 480px;
  margin-bottom: 1.75rem;
}

.flashcard {
  width: 100%;
  min-height: 480px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-2xl);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  text-align: center;
  position: relative;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
}

.flashcard:hover {
  box-shadow: 0 16px 32px -8px rgba(0, 0, 0, 0.12);
  border-color: #6ee7b7;
}

@media (prefers-reduced-motion: reduce) {
  .flashcard {
    transition: none !important;
  }
}

.flashcard-img-wrap {
  width: 190px;
  height: 190px;
  border-radius: var(--radius-xl);
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: 1.25rem;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.04);
}

.flashcard-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.5rem;
}

.flashcard-word {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  color: #064e3b;
  line-height: 1.15;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.flashcard-phonetic {
  font-size: 1.15rem;
  font-weight: 600;
  color: #059669;
  font-family: 'Be Vietnam Pro', system-ui, sans-serif;
  margin-bottom: 0.5rem;
}

.flashcard-part-of-speech {
  display: inline-block;
  background: #ecfdf5;
  color: #047857;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  border: 1px solid #a7f3d0;
}

.flashcard-vietnamese {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.flashcard-example-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 0.85rem 1.25rem;
  width: 100%;
  max-width: 520px;
  margin: 0.5rem 0 1rem;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.flashcard-example-en {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 0.15rem;
}

.flashcard-example-vi {
  font-size: 0.85rem;
  color: #64748b;
  margin-bottom: 0;
}

/* Audio speaker buttons - Minimum 44x44px target */
.btn-speaker {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #ecfdf5;
  color: #059669;
  border: 1.5px solid #a7f3d0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.btn-speaker:hover {
  background: #059669;
  color: #ffffff;
  border-color: #047857;
  transform: scale(1.06);
}

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

.btn-speaker.speaking {
  animation: speakerPulse 0.8s infinite alternate;
}

@keyframes speakerPulse {
  from { transform: scale(1); background: #10b981; color: #ffffff; }
  to { transform: scale(1.12); background: #047857; color: #ffffff; }
}

/* Flashcard Navigation Controls */
.flashcard-nav-row {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
  width: 100%;
}

.flashcard-decision-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
}

.flashcard-step-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
}

.btn-nav-step {
  flex: 1;
  min-width: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 0.85rem;
  font-weight: 700;
  font-size: 0.9rem;
}

@media (min-width: 769px) {
  .flashcard-nav-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .flashcard-decision-row {
    order: 2;
    width: auto;
  }
  .flashcard-step-row {
    order: 1;
    display: contents;
  }
  #btnPrevCard {
    order: 1;
    flex: 0 0 auto;
    min-width: 120px;
  }
  #btnNextCard {
    order: 3;
    flex: 0 0 auto;
    min-width: 120px;
  }
}

.btn-decision {
  min-width: 140px;
  padding: 0.65rem 1.25rem;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-decision.known {
  background: #ecfdf5;
  color: #059669;
  border: 1.5px solid #a7f3d0;
}

.btn-decision.known:hover {
  background: #059669;
  color: #ffffff;
}

.btn-decision.review {
  background: #fffbeb;
  color: #d97706;
  border: 1.5px solid #fde68a;
}

.btn-decision.review:hover {
  background: #d97706;
  color: #ffffff;
}

/* Hidden Meaning Mode */
.flashcard.hidden-meaning .flashcard-phonetic,
.flashcard.hidden-meaning .flashcard-part-of-speech,
.flashcard.hidden-meaning .flashcard-vietnamese,
.flashcard.hidden-meaning .flashcard-example-box {
  display: none !important;
}

.flashcard-reveal-btn-wrap {
  display: none;
  margin: 1.5rem 0;
}

.flashcard.hidden-meaning .flashcard-reveal-btn-wrap {
  display: block !important;
}

/* ==========================================================================
   3. Quiz Mode Styles
   ========================================================================== */
.quiz-stage {
  max-width: 680px;
  margin: 0 auto;
}

.quiz-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.75rem;
}

.quiz-img-container {
  width: 180px;
  height: 180px;
  border-radius: var(--radius-xl);
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.quiz-img-container img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.5rem;
}

.quiz-question-prompt {
  text-align: center;
  margin-bottom: 1.5rem;
}

.quiz-prompt-vi {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.quiz-prompt-hint-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.quiz-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.quiz-text-input {
  width: 100%;
  font-size: 1.35rem;
  font-weight: 700;
  color: #1e293b;
  text-align: center;
  padding: 0.85rem 1.25rem;
  border: 2px solid #cbd5e1;
  border-radius: var(--radius-xl);
  outline: none;
  transition: all var(--transition-fast);
  background: #f8fafc;
}

.quiz-text-input:focus {
  border-color: #059669;
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

.quiz-text-input.is-invalid {
  border-color: #ef4444 !important;
  background: #fef2f2 !important;
  animation: shakeInput 0.35s ease;
}

@keyframes shakeInput {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(6px); }
  75% { transform: translateX(-4px); }
}

.quiz-feedback-box {
  display: none;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
}

.quiz-feedback-box.error {
  display: block;
  background: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fca5a5;
}

.quiz-feedback-box.correct {
  display: block;
  background: #ecfdf5;
  color: #047857;
  border: 1px solid #a7f3d0;
}

/* Correct Answer Reveal Box */
.quiz-reveal-box {
  display: none;
  background: #f0fdf4;
  border: 2px solid #86efac;
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
  animation: popIn 0.3s ease-out;
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.quiz-reveal-word {
  font-size: 1.85rem;
  font-weight: 800;
  color: #064e3b;
  margin-bottom: 0.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.quiz-reveal-phonetic {
  font-size: 1.05rem;
  color: #059669;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.quiz-hint-box {
  background: #fffbeb;
  border: 1.5px solid #fde68a;
  border-radius: var(--radius-md);
  padding: 0.65rem 1rem;
  color: #92400e;
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: 0.06em;
  display: none;
}

/* ==========================================================================
   4. Speech Settings Modal & Banner Notice
   ========================================================================== */
.speech-notice-note {
  font-size: 0.78rem;
  color: #64748b;
  text-align: center;
  margin-top: 0.5rem;
}

.speech-settings-drawer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
  display: none;
}

.speech-settings-drawer.open {
  display: block;
}

.speech-settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

/* ==========================================================================
   5. Results Card Styles
   ========================================================================== */
.english-summary-card {
  display: none;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
  max-width: 680px;
  margin: 0 auto;
}

.summary-score-hero {
  font-size: 3.5rem;
  font-weight: 900;
  color: #059669;
  line-height: 1;
  margin: 0.5rem 0 0.25rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.summary-metric {
  background: var(--surface-alt);
  padding: 1rem;
  border-radius: var(--radius-lg);
}

.summary-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.summary-lbl {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

@media (max-width: 640px) {
  .flashcard {
    padding: 1.5rem 0.85rem !important;
    min-height: auto !important;
  }
  .flashcard-img-wrap {
    width: 140px;
    height: 140px;
  }
  .flashcard-word {
    font-size: 1.85rem !important;
  }
  .flashcard-vietnamese {
    font-size: 1.15rem !important;
  }
  .flashcard-example-box {
    padding: 0.65rem 0.85rem;
  }
  .btn-decision {
    min-width: unset !important;
    flex: 1;
    padding: 0.5rem 0.4rem;
    font-size: 0.82rem;
  }
}