/* =============================================
   MO Permit Prep — Style Sheet
   Aesthetic: Soft pastel, playful, Gen-Z cute
   Mobile-first, optimized for iPhone SE+
   ============================================= */

:root {
  --pink: #E8A0BF;
  --pink-light: #FBE4F0;
  --pink-dark: #C76DA2;
  --lavender: #957DAD;
  --lavender-light: #D8CCE6;
  --mint: #B5EAD7;
  --mint-dark: #7CC5A8;
  --peach: #FFDAC1;
  --coral: #FF9AA2;
  --baby-blue: #C7CEEA;
  --lemon: #FFFFD8;
  --cream: #FFF9F0;
  --white: #FFFFFF;
  --text: #3D3047;
  --text-light: #6B5B7B;
  --text-muted: #9B8DAE;
  --correct: #7CC5A8;
  --correct-bg: #E8F8F0;
  --wrong: #FF8A95;
  --wrong-bg: #FFF0F1;
  --shadow-soft: 0 4px 20px rgba(151, 125, 173, 0.12);
  --shadow-card: 0 2px 12px rgba(151, 125, 173, 0.10);
  --shadow-btn: 0 4px 16px rgba(232, 160, 191, 0.25);
  --radius: 20px;
  --radius-sm: 14px;
  --radius-xs: 10px;
  --font-display: 'Fredoka', sans-serif;
  --font-body: 'Quicksand', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

#app {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

/* ============ SCREENS ============ */
.screen {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  opacity: 0;
  pointer-events: none;
  transform: translateX(30px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}
.screen.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

/* ============ HOME SCREEN ============ */
.home-hero {
  background: linear-gradient(135deg, var(--pink-light) 0%, var(--lavender-light) 50%, var(--baby-blue) 100%);
  padding: 50px 24px 36px;
  text-align: center;
  border-radius: 0 0 40px 40px;
  position: relative;
  overflow: hidden;
}
.home-hero::before {
  content: '';
  position: absolute;
  top: -50px; right: -50px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
}
.home-hero::after {
  content: '';
  position: absolute;
  bottom: -30px; left: -30px;
  width: 150px; height: 150px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
}
.hero-sparkles {
  font-size: 28px;
  margin-bottom: 6px;
  animation: sparkle 2s ease-in-out infinite;
}
.hero-car {
  font-size: 44px;
  margin-bottom: 10px;
  animation: drive 3s ease-in-out infinite;
}
.hero-title {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
  position: relative;
  z-index: 1;
}
.hero-subtitle {
  font-size: 15px;
  color: var(--text-light);
  margin-top: 6px;
  font-weight: 500;
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  gap: 6px;
  margin-top: 14px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-light);
  position: relative;
  z-index: 1;
}

/* Menu Cards */
.home-menu {
  padding: 20px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.menu-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--white);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
  width: 100%;
  font-family: var(--font-body);
}
.menu-card:active {
  transform: scale(0.97);
  border-color: var(--pink);
}
.menu-emoji {
  font-size: 30px;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--pink-light);
  border-radius: 12px;
}
.menu-label {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  display: block;
}
.menu-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  font-weight: 500;
  display: block;
  margin-top: 1px;
}

/* Home Footer */
.home-footer {
  text-align: center;
  padding: 12px 24px 30px;
  font-size: 11px;
  color: var(--text-muted);
}
.home-footer a {
  color: var(--lavender);
  text-decoration: underline;
}
.home-footer .disclaimer {
  margin-top: 4px;
  font-size: 10px;
}

/* ============ CATEGORY SCREEN ============ */
.screen-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 16px 12px;
  position: sticky;
  top: 0;
  background: var(--cream);
  z-index: 10;
}
.screen-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  flex: 1;
}
.back-btn {
  background: var(--white);
  border: 1.5px solid var(--lavender-light);
  border-radius: 10px;
  padding: 8px 14px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition);
}
.back-btn:active {
  background: var(--lavender-light);
}

.category-grid {
  padding: 4px 16px 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 10px;
  background: var(--white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  font-family: var(--font-body);
}
.cat-card:active {
  transform: scale(0.95);
}
.cat-emoji {
  font-size: 32px;
  margin-bottom: 8px;
}
.cat-name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.cat-count {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
  font-weight: 500;
}

/* ============ QUIZ SCREEN ============ */
.quiz-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px 10px;
  position: sticky;
  top: 0;
  background: var(--cream);
  z-index: 10;
}
.quiz-header .back-btn {
  padding: 8px 12px;
  font-size: 16px;
  min-width: 40px;
}
.quiz-progress {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
}
.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--lavender-light);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--pink), var(--lavender));
  border-radius: 4px;
  transition: width 0.4s ease;
  width: 0%;
}
.progress-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  min-width: 40px;
  text-align: right;
}
.quiz-score {
  font-size: 14px;
  font-weight: 700;
  color: var(--correct);
  min-width: 36px;
  text-align: right;
}

.quiz-body {
  padding: 6px 16px 30px;
}

.question-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 16px;
}
.question-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--pink-light);
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  color: var(--pink-dark);
  margin-bottom: 12px;
}
.question-text {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

/* Options */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--white);
  border: 2px solid var(--lavender-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  width: 100%;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.4;
  color: var(--text);
  font-weight: 500;
}
.option-btn:active:not(.disabled) {
  transform: scale(0.98);
}
.option-letter {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--lavender-light);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  color: var(--lavender);
  flex-shrink: 0;
  transition: var(--transition);
}
.option-text {
  flex: 1;
  padding-top: 3px;
}

/* Option States */
.option-btn.selected {
  border-color: var(--lavender);
  background: var(--lavender-light);
}
.option-btn.correct {
  border-color: var(--correct);
  background: var(--correct-bg);
  animation: popCorrect 0.4s ease;
}
.option-btn.correct .option-letter {
  background: var(--correct);
  color: white;
}
.option-btn.wrong {
  border-color: var(--wrong);
  background: var(--wrong-bg);
  animation: shake 0.5s ease;
}
.option-btn.wrong .option-letter {
  background: var(--wrong);
  color: white;
}
.option-btn.disabled {
  cursor: default;
  opacity: 0.6;
}
.option-btn.correct.disabled {
  opacity: 1;
}

/* Explanation */
.explanation-box {
  margin-top: 14px;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--white);
  border: 2px solid var(--lavender-light);
  animation: slideUp 0.3s ease;
}
.explanation-box.is-correct {
  border-color: var(--mint);
  background: var(--correct-bg);
}
.explanation-box.is-wrong {
  border-color: var(--coral);
  background: var(--wrong-bg);
}
.explanation-icon {
  font-size: 24px;
  margin-bottom: 6px;
}
.explanation-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-light);
}

/* Next Button */
.next-btn {
  display: block;
  width: 100%;
  margin-top: 14px;
  padding: 16px;
  background: linear-gradient(135deg, var(--pink), var(--lavender));
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: var(--transition);
  animation: slideUp 0.3s ease;
}
.next-btn:active {
  transform: scale(0.97);
}

/* ============ RESULTS SCREEN ============ */
.results-container {
  padding: 40px 24px 40px;
  text-align: center;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.results-emoji {
  font-size: 64px;
  margin-bottom: 10px;
  animation: bounceIn 0.6s ease;
}
.results-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
}
.results-subtitle {
  font-size: 15px;
  color: var(--text-light);
  margin-top: 6px;
  font-weight: 500;
}
.results-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 28px 0;
  padding: 20px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  width: 100%;
  max-width: 340px;
  justify-content: center;
}
.stat-circle {
  position: relative;
  width: 100px;
  height: 100px;
}
.stat-circle svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}
.stat-bg {
  fill: none;
  stroke: var(--lavender-light);
  stroke-width: 10;
}
.stat-fill {
  fill: none;
  stroke: var(--pink);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 1s ease;
}
.stat-number {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
}
.stat-details {
  text-align: left;
}
.stat-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 6px;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot.correct { background: var(--correct); }
.dot.wrong { background: var(--wrong); }
.dot.total { background: var(--lavender-light); }

.results-message {
  padding: 14px 20px;
  background: var(--pink-light);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-light);
  line-height: 1.5;
  width: 100%;
  max-width: 340px;
  margin-bottom: 24px;
}

.results-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 340px;
}
.action-btn {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  border: none;
}
.action-btn:active { transform: scale(0.97); }
.action-btn.primary {
  background: linear-gradient(135deg, var(--pink), var(--lavender));
  color: white;
  box-shadow: var(--shadow-btn);
}
.action-btn.secondary {
  background: var(--white);
  color: var(--text);
  border: 2px solid var(--lavender-light);
}
.action-btn.tertiary {
  background: transparent;
  color: var(--text-muted);
}

/* ============ REVIEW SCREEN ============ */
.review-list {
  padding: 0 16px 100px;
}
.review-item {
  background: var(--white);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 10px;
  border-left: 4px solid var(--lavender-light);
}
.review-item.was-correct {
  border-left-color: var(--correct);
}
.review-item.was-wrong {
  border-left-color: var(--wrong);
}
.review-q {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}
.review-answer {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 4px;
}
.review-answer strong {
  color: var(--correct);
}
.review-answer.user-wrong strong {
  color: var(--wrong);
}
.review-explain {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--lavender-light);
}
.review-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: var(--cream);
  border-top: 1px solid var(--lavender-light);
}

/* ============ FLASHCARDS ============ */
.fc-counter {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}
.flashcard-container {
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.flashcard {
  width: 100%;
  max-width: 380px;
  height: 360px;
  perspective: 1000px;
  cursor: pointer;
  margin-bottom: 20px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard-inner.flipped {
  transform: rotateY(180deg);
}
.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow-y: auto;
}
.flashcard-front {
  background: linear-gradient(135deg, var(--white), var(--pink-light));
  box-shadow: var(--shadow-soft);
  text-align: center;
}
.flashcard-back {
  background: linear-gradient(135deg, var(--white), var(--mint));
  box-shadow: var(--shadow-soft);
  transform: rotateY(180deg);
  text-align: center;
}
.fc-category {
  font-size: 12px;
  font-weight: 600;
  color: var(--pink-dark);
  background: rgba(232,160,191,0.2);
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  align-self: center;
}
.fc-question {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}
.fc-hint {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}
.fc-answer-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--mint-dark);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.fc-answer {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}
.fc-explanation {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-light);
}

.flashcard-nav {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 380px;
}
.fc-nav-btn {
  flex: 1;
  padding: 12px;
  border: 2px solid var(--lavender-light);
  background: var(--white);
  border-radius: var(--radius-xs);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition);
}
.fc-nav-btn:active {
  background: var(--lavender-light);
}
.fc-nav-btn.shuffle {
  flex: 0.8;
  border-color: var(--pink);
  color: var(--pink-dark);
}

/* ============ MODAL ============ */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(61, 48, 71, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}
.modal-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  max-width: 300px;
  width: 100%;
  box-shadow: var(--shadow-soft);
  animation: slideUp 0.3s ease;
}
.modal-emoji { font-size: 40px; margin-bottom: 8px; }
.modal-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  margin-bottom: 6px;
}
.modal-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.modal-actions {
  display: flex;
  gap: 10px;
}
.modal-btn {
  flex: 1;
  padding: 12px;
  border-radius: var(--radius-xs);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.modal-btn.cancel {
  background: var(--pink);
  color: white;
}
.modal-btn.confirm {
  background: var(--lavender-light);
  color: var(--text-light);
}

/* ============ UTILITIES ============ */
.hidden {
  display: none !important;
}

/* ============ ANIMATIONS ============ */
@keyframes sparkle {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.2) rotate(10deg); }
}
@keyframes drive {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(8px); }
  75% { transform: translateX(-8px); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15% { transform: translateX(-6px); }
  30% { transform: translateX(6px); }
  45% { transform: translateX(-4px); }
  60% { transform: translateX(4px); }
  75% { transform: translateX(-2px); }
}
@keyframes popCorrect {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes bounceIn {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.1); }
  70% { transform: scale(0.95); }
  100% { transform: scale(1); opacity: 1; }
}

/* ============ RESPONSIVE — safe for iPhone SE (320px) and up ============ */
@media (max-width: 360px) {
  .hero-title { font-size: 28px; }
  .hero-subtitle { font-size: 13px; }
  .question-text { font-size: 16px; }
  .option-btn { font-size: 14px; padding: 12px 14px; }
  .flashcard { height: 300px; }
  .fc-question { font-size: 16px; }
  .menu-card { padding: 14px 14px; }
  .category-grid { gap: 8px; }
}

/* Larger phones & small tablets */
@media (min-width: 500px) {
  .home-menu, .quiz-body, .category-grid, .flashcard-container {
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
  .review-list {
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
}