/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --color-primary: #6C63FF;
  --color-primary-dark: #4B44CC;
  --color-primary-light: #EEF0FF;
  --color-bg: #F7F6FF;
  --color-card: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-secondary: #6B7280;
  --color-border: #E5E7EB;
  --color-star-filled: #F59E0B;
  --color-star-empty: #D1D5DB;
  --color-shadow: rgba(108, 99, 255, 0.12);

  --font-family: 'Nunito', system-ui, -apple-system, sans-serif;
  --radius-card: 14px;
  --radius-modal: 20px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Nunito', system-ui, -apple-system, sans-serif;
  font-family: var(--font-family);
  background-color: #F7F6FF;
  background-color: var(--color-bg);
  color: #1A1A2E;
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-size: 16px;
  line-height: 1.6;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* ===========================
   Header
   =========================== */
header {
  background: #6C63FF;
  background: linear-gradient(135deg, #6C63FF 0%, #8B83FF 100%);
  background: linear-gradient(135deg, var(--color-primary) 0%, #8B83FF 100%);
  color: #fff;
  padding: 2rem 1.5rem;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

header h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1rem;
  opacity: 0.85;
  margin-top: 0.2rem;
  font-weight: 400;
}

.word-count {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
}

/* ===========================
   Main Layout
   =========================== */
main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ===========================
   Controls (Search + Filter)
   =========================== */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
}

/* Search */
.search-wrap {
  position: relative;
  flex: 1;
  min-width: 220px;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: #6B7280;
  color: var(--color-text-secondary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  border: 2px solid #E5E7EB;
  border: 2px solid var(--color-border);
  border-radius: 50px;
  font-family: inherit;
  font-size: 1rem;
  color: #1A1A2E;
  color: var(--color-text);
  background: #FFFFFF;
  background: var(--color-card);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.search-input::placeholder {
  color: #6B7280;
  color: var(--color-text-secondary);
}

/* Filter buttons */
.filter-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: #6B7280;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.2rem;
}

.filter-btn,
.view-filter-btn,
.mastery-filter-btn {
  padding: 0.5rem 0.9rem;
  border-radius: 50px;
  border: 2px solid #E5E7EB;
  border: 2px solid var(--color-border);
  font-size: 0.85rem;
  font-weight: 700;
  color: #6B7280;
  color: var(--color-text-secondary);
  background: #FFFFFF;
  background: var(--color-card);
  transition: all var(--transition);
  min-height: 44px;
  min-width: 44px;
  white-space: nowrap;
}

.filter-btn:hover,
.view-filter-btn:hover,
.mastery-filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.active,
.view-filter-btn.active,
.mastery-filter-btn.active {
  background: #6C63FF;
  background: var(--color-primary);
  border-color: #6C63FF;
  border-color: var(--color-primary);
  color: #fff;
}

/* ===========================
   Word Grid
   =========================== */
.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}

/* ===========================
   Word Cards
   =========================== */
.word-card {
  background: #FFFFFF;
  background: var(--color-card);
  border-radius: 14px;
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  border: 2px solid transparent;
  box-shadow: 0 2px 8px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  text-align: left;
  outline: none;
}

.word-card:hover,
.word-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow);
  border-color: var(--color-primary);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.card-meta {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.card-word {
  font-size: 1.25rem;
  font-weight: 800;
  color: #1A1A2E;
  color: var(--color-text);
  line-height: 1.2;
}

.card-type {
  display: inline-flex;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 999px;
  padding: 0.12rem 0.5rem;
}

.card-stars {
  display: flex;
  gap: 1px;
  flex-shrink: 0;
  padding-top: 2px;
}

.card-definition {
  font-size: 0.9rem;
  color: #6B7280;
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.card-view-count {
  font-size: 0.75rem;
  font-weight: 700;
  color: #6C63FF;
  color: var(--color-primary);
  opacity: 0.7;
}

.mastery-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.mastery-badge.mastery-mastered {
  background: #D1FAE5;
  color: #065F46;
}

.mastery-badge.mastery-learning {
  background: #FEF3C7;
  color: #92400E;
}

/* Stars */
.star {
  font-size: 0.9rem;
  line-height: 1;
}

.star--filled { color: #F59E0B; color: var(--color-star-filled); }
.star--empty  { color: #D1D5DB; color: var(--color-star-empty); }

/* ===========================
   Empty State
   =========================== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: #6B7280;
  color: var(--color-text-secondary);
}

.empty-state-emoji {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #1A1A2E;
  color: var(--color-text);
}

.empty-state p {
  font-size: 1rem;
}


/* ===========================
   Modal
   =========================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 1000;
}

.hidden {
  display: none !important;
}

.modal-overlay.hidden {
  display: none;
}

.modal-card {
  background: #FFFFFF;
  background: var(--color-card);
  border-radius: 20px;
  border-radius: var(--radius-modal);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp 0.25s ease;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2);
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #F7F6FF;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6B7280;
  color: var(--color-text-secondary);
  transition: background var(--transition), color var(--transition);
  z-index: 1;
}

.close-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.close-btn svg {
  width: 18px;
  height: 18px;
}

.modal-header {
  background: #6C63FF;
  background: linear-gradient(135deg, #6C63FF 0%, #8B83FF 100%);
  background: linear-gradient(135deg, var(--color-primary) 0%, #8B83FF 100%);
  color: #fff;
  padding: 2rem 1.75rem 1.5rem;
  border-radius: var(--radius-modal) var(--radius-modal) 0 0;
}

.modal-word {
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}

.modal-type {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.92;
  margin-bottom: 0.45rem;
}

.modal-pronunciation {
  font-size: 1rem;
  opacity: 0.8;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.modal-pronunciation-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.speak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.4);
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}

.speak-btn:hover {
  background: rgba(255, 255, 255, 0.35);
  border-color: #fff;
  transform: scale(1.05);
}

.speak-btn:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.speak-btn svg {
  width: 18px;
  height: 18px;
}

.modal-stars {
  display: flex;
  gap: 2px;
}

.modal-stars .star {
  font-size: 1.2rem;
}

.modal-body {
  padding: 1.5rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.modal-section-title {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6C63FF;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.modal-definition {
  font-size: 1.15rem;
  font-weight: 600;
  color: #1A1A2E;
  color: var(--color-text);
  line-height: 1.6;
}

.modal-sentence {
  font-size: 1rem;
  color: #6B7280;
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-style: italic;
  border-left: 3px solid #EEF0FF;
  border-left: 3px solid var(--color-primary-light);
  padding-left: 1rem;
}

.modal-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.modal-tags li {
  background: #EEF0FF;
  background: var(--color-primary-light);
  color: #4B44CC;
  color: var(--color-primary-dark);
  border-radius: 50px;
  padding: 0.3rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.antonym-tags li {
  background: #FEF3C7;
  color: #92400E;
}

.modal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.modal-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  background: #EEF0FF;
  background: var(--color-primary-light);
  color: #4B44CC;
  color: var(--color-primary-dark);
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}

.modal-link:hover {
  background: #fff;
  border-color: var(--color-primary);
}

.modal-link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.modal-view-count {
  font-size: 0.8rem;
  font-weight: 700;
  color: #6C63FF;
  color: var(--color-primary);
  opacity: 0.7;
  text-align: right;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

/* ===========================
   Footer
   =========================== */
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.875rem;
  color: #6B7280;
  color: var(--color-text-secondary);
  border-top: 1px solid #E5E7EB;
  border-top: 1px solid var(--color-border);
}

/* ===========================
   Responsive
   =========================== */

/* Mobile */
@media (max-width: 480px) {
  header {
    padding: 1.5rem 1rem;
  }

  main {
    padding: 1.25rem 1rem;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .search-wrap {
    min-width: unset;
  }

  .filter-wrap {
    justify-content: flex-start;
  }

  .filter-label {
    display: none;
  }

  .filter-btn,
  .view-filter-btn,
  .mastery-filter-btn {
    padding: 0.5rem 0.7rem;
    font-size: 0.8rem;
  }

  /* Bottom sheet modal on mobile */
  .modal-overlay {
    align-items: flex-end;
    padding: 0;
  }

  .modal-card {
    max-width: 100%;
    max-height: 92vh;
    border-radius: var(--radius-modal) var(--radius-modal) 0 0;
    animation: slideUpSheet 0.3s ease;
  }

  @keyframes slideUpSheet {
    from { transform: translateY(100%); }
    to   { transform: translateY(0); }
  }

  .modal-row {
    grid-template-columns: 1fr;
  }
}

/* Large desktop */
@media (min-width: 1280px) {
  .header-inner {
    flex-wrap: nowrap;
  }
}

/* ===========================
   Quiz Launch Button
   =========================== */
.quiz-launch-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.2rem;
  background: #6C63FF;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 800;
  border: 2px solid var(--color-primary);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 44px;
  white-space: nowrap;
  flex-shrink: 0;
}

.quiz-launch-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.quiz-launch-btn:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  box-shadow: 0 4px 14px var(--color-shadow);
  transform: translateY(-1px);
}

.quiz-launch-btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

/* ===========================
   Quiz Overlay & Panel Shell
   =========================== */
#quiz-overlay {
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.quiz-panel {
  background: #FFFFFF;
  background: var(--color-card);
  border-radius: 20px;
  border-radius: var(--radius-modal);
  width: 100%;
  max-width: 540px;
  max-height: 92vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp 0.25s ease;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
}

.quiz-panel[tabindex="-1"]:focus {
  outline: none;
}

.quiz-screen-actions {
  display: flex;
  justify-content: flex-end;
  padding: 1rem 1rem 0;
}

.quiz-exit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  min-height: 44px;
  border-radius: 999px;
  border: 2px solid var(--color-border);
  background: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 800;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.quiz-exit-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.quiz-exit-btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===========================
   Quiz Setup Screen
   =========================== */
.quiz-setup-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 2rem 2.5rem;
  gap: 1.1rem;
  text-align: center;
}

.quiz-setup-emoji {
  font-size: 3.5rem;
  line-height: 1;
}

.quiz-setup-title {
  font-size: clamp(1.6rem, 5vw, 2rem);
  font-weight: 800;
  color: #1A1A2E;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.quiz-setup-subtitle {
  font-size: 1rem;
  color: #6B7280;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.quiz-setup-helper {
  max-width: 34rem;
  color: #6B7280;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.quiz-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  width: 100%;
}

.quiz-option-group,
.quiz-scope-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.quiz-scope-group {
  margin-top: 0.4rem;
}

.quiz-scope-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #6C63FF;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
  padding-left: 0.55rem;
  border-left: 3px solid var(--color-primary);
}

.quiz-scope-btn,
.quiz-option-btn {
  padding: 0.65rem 1.2rem;
  border-radius: 50px;
  border: 2px solid #E5E7EB;
  border: 2px solid var(--color-border);
  font-size: 0.95rem;
  font-weight: 700;
  color: #6B7280;
  color: var(--color-text-secondary);
  background: #FFFFFF;
  background: var(--color-card);
  transition: all var(--transition);
  min-height: 44px;
  width: 100%;
}

.quiz-scope-btn:hover,
.quiz-option-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.quiz-scope-btn.active,
.quiz-option-btn.active {
  background: #6C63FF;
  background: var(--color-primary);
  border-color: #6C63FF;
  border-color: var(--color-primary);
  color: #fff;
}

.quiz-personal-best {
  font-size: 0.9rem;
  font-weight: 700;
  color: #6C63FF;
  color: var(--color-primary);
  background: #EEF0FF;
  background: var(--color-primary-light);
  border-radius: 50px;
  padding: 0.4rem 1.2rem;
}

.quiz-start-callout {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px dashed #F59E0B;
  border-radius: 18px;
  background: #FFFBEB;
  color: #92400E;
  font-size: 0.98rem;
  font-weight: 800;
  line-height: 1.35;
}

.quiz-start-callout-arrow {
  color: #D97706;
  font-size: 1.35rem;
  line-height: 1;
  animation: quizStartArrowBounce 1.1s ease-in-out infinite;
}

.quiz-start-btn {
  display: block;
  width: 100%;
  padding: 0.85rem 1.5rem;
  background: #6C63FF;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 800;
  border: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 52px;
  margin-top: 0.5rem;
}

.quiz-primary-start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 1rem 1.5rem;
  background: #F59E0B;
  color: #1A1A2E;
  color: var(--color-text);
  border: 3px solid #FCD34D;
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 60px;
  margin-top: 0;
  box-shadow: 0 10px 24px rgba(245, 158, 11, 0.35);
}

.quiz-start-btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 999px;
  background: #1A1A2E;
  background: var(--color-text);
  color: #fff;
  font-size: 0.82rem;
  line-height: 1;
}

.quiz-start-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px var(--color-shadow);
}

.quiz-primary-start-btn:hover {
  background: #FBBF24;
  border-color: #F59E0B;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(245, 158, 11, 0.42);
}

.quiz-primary-start-btn:focus-visible {
  outline: 4px solid var(--color-primary);
  outline-offset: 4px;
}

@keyframes quizStartArrowBounce {
  0%, 100% { transform: translateY(-2px); }
  50% { transform: translateY(4px); }
}

@media (prefers-reduced-motion: reduce) {
  .quiz-start-callout-arrow {
    animation: none;
  }
}

/* ===========================
   Quiz Question Screen
   =========================== */
.quiz-header {
  background: #6C63FF;
  background: linear-gradient(135deg, #6C63FF 0%, #8B83FF 100%);
  background: linear-gradient(135deg, var(--color-primary) 0%, #8B83FF 100%);
  padding: 1.25rem 1.5rem 1rem;
  border-radius: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.quiz-progress-bar-wrap {
  height: 8px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50px;
  overflow: hidden;
}

.quiz-progress-bar-fill {
  height: 100%;
  background: #fff;
  border-radius: 50px;
  width: 0%;
  transition: width 0.4s ease;
}

.quiz-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
}

.quiz-counter { opacity: 0.9; }

.quiz-score-display {
  font-size: 1rem;
  font-weight: 800;
}

.quiz-streak {
  font-size: 0.85rem;
  font-weight: 800;
  min-width: 5ch;
  text-align: right;
  opacity: 0.9;
}

.quiz-question-card {
  padding: 1.75rem 1.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.quiz-question-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6C63FF;
  color: var(--color-primary);
}

.quiz-question-text {
  font-size: clamp(1.05rem, 3.5vw, 1.3rem);
  font-weight: 700;
  color: #1A1A2E;
  color: var(--color-text);
  line-height: 1.5;
}

/* ===========================
   Answer Buttons
   =========================== */
.quiz-answers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  padding: 0.5rem 1.75rem 1.25rem;
}

.quiz-answer-btn {
  padding: 0.85rem 1rem;
  border-radius: 14px;
  border-radius: var(--radius-card);
  border: 2px solid #E5E7EB;
  border: 2px solid var(--color-border);
  background: #FFFFFF;
  background: var(--color-card);
  font-size: 0.9rem;
  font-weight: 700;
  color: #1A1A2E;
  color: var(--color-text);
  text-align: left;
  line-height: 1.4;
  min-height: 64px;
  transition: border-color var(--transition), background var(--transition),
              color var(--transition), transform var(--transition);
}

@media (hover: hover) and (pointer: fine) {
  .quiz-answer-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    transform: translateY(-2px);
  }
}

.quiz-answer-btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.quiz-answer-btn:disabled {
  cursor: default;
  transform: none;
}

.quiz-answer-btn.correct {
  background: #D1FAE5;
  border-color: #10B981;
  color: #065F46;
}

.quiz-answer-btn.wrong {
  background: #FEE2E2;
  border-color: #EF4444;
  color: #7F1D1D;
}

/* ===========================
   Feedback Strip
   =========================== */
.quiz-feedback {
  padding: 0 1.75rem 1.5rem;
  min-height: 2.5rem;
  font-size: 1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.quiz-feedback.visible { opacity: 1; }
.quiz-feedback.feedback-correct { color: #065F46; }
.quiz-feedback.feedback-wrong   { color: #991B1B; }

/* ===========================
   End Screen
   =========================== */
.quiz-end-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 2rem 2.5rem;
  gap: 0.85rem;
  text-align: center;
}

.quiz-end-emoji {
  font-size: 4rem;
  line-height: 1;
}

.quiz-end-title {
  font-size: clamp(1.4rem, 5vw, 1.8rem);
  font-weight: 800;
  color: #1A1A2E;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.quiz-end-score {
  font-size: 1.4rem;
  font-weight: 800;
  color: #6C63FF;
  color: var(--color-primary);
}

.quiz-end-best {
  font-size: 0.9rem;
  font-weight: 700;
  color: #6B7280;
  color: var(--color-text-secondary);
  min-height: 1.4em;
}

.quiz-review {
  width: 100%;
  margin-top: 0.25rem;
  padding: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-card);
  background: #F9FAFB;
  text-align: left;
}

.quiz-review-title {
  margin-bottom: 0.7rem;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 800;
}

.quiz-review-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  list-style: none;
}

.quiz-review-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.4;
}

.quiz-review-item strong {
  color: var(--color-primary-dark);
  font-size: 1rem;
}

.quiz-review-item small {
  color: #991B1B;
  font-weight: 700;
}

.quiz-end-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  width: 100%;
  margin-top: 0.5rem;
}

.quiz-back-btn {
  display: block;
  width: 100%;
  padding: 0.7rem 1.5rem;
  background: transparent;
  color: #6B7280;
  color: var(--color-text-secondary);
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 700;
  border: 2px solid #E5E7EB;
  border: 2px solid var(--color-border);
  transition: border-color var(--transition), color var(--transition);
  min-height: 48px;
}

.quiz-back-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===========================
   Quiz Responsive
   =========================== */
@media (max-width: 480px) {
  .quiz-screen-actions {
    padding: 0.85rem 0.85rem 0;
  }

  .quiz-options-grid {
    grid-template-columns: 1fr;
  }

  .quiz-answers-grid {
    grid-template-columns: 1fr;
    padding: 0.5rem 1.25rem 1rem;
  }

  .quiz-question-card {
    padding: 1.25rem 1.25rem 0.75rem;
  }

  .quiz-feedback {
    padding: 0 1.25rem 1.25rem;
  }
}