*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  background: #f0f4f8;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.app {
  width: 100%;
  max-width: 480px;
}

.hidden {
  display: none !important;
}

/* ================================
   Start Screen
================================ */
#start-screen {
  display: flex;
  justify-content: center;
}

.start-card {
  background: #fff;
  border-radius: 1.25rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  padding: 2.5rem 2rem;
  width: 100%;
  text-align: center;
}

.start-title {
  font-size: 2rem;
  font-weight: 700;
  color: #2d3748;
  line-height: 1.3;
  margin-bottom: 1.25rem;
}

.start-subtitle {
  font-size: 0.95rem;
  color: #17B890;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.03em;
}

.feature-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
  margin-bottom: 1.75rem;
}

.feature-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #4a5568;
}


.badge-sep {
  color: #94a3b8;
  font-size: 0.9rem;
  line-height: 1;
}

/* Mode selection */
.mode-section {
  background: #f7fafc;
  border-radius: 0.75rem;
  padding: 1.25rem 1rem;
  margin-bottom: 1rem;
  text-align: left;
}

.mode-section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: #4a5568;
  margin-bottom: 0.75rem;
}

.mode-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.mode-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.75rem;
  border: 2px solid #e2e8f0;
  border-radius: 0.6rem;
  background: #fff;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.mode-option:hover {
  border-color: #17B890;
  background: #E4F9F4;
}

.mode-option:has(input:checked) {
  border-color: #17B890;
  background: #E4F9F4;
}

.mode-option input[type="radio"] {
  accent-color: #17B890;
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.mode-option-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.mode-option-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #2d3748;
}

.mode-option-sub {
  font-size: 0.72rem;
  color: #718096;
}

/* Font selection */
.font-section {
  background: #f7fafc;
  border-radius: 0.75rem;
  padding: 1.25rem 1rem;
  margin-bottom: 2rem;
  text-align: left;
}

.font-section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: #4a5568;
  margin-bottom: 0.75rem;
}

.font-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.font-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem;
  border: 2px solid #e2e8f0;
  border-radius: 0.6rem;
  background: #fff;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.font-option:hover {
  border-color: #17B890;
  background: #E4F9F4;
}

.font-option.selected {
  border-color: #17B890;
  background: #E4F9F4;
}

.font-option input[type="radio"] {
  accent-color: #17B890;
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.font-option-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.font-option-top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.font-option-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: #2d3748;
}


.font-option-preview {
  font-size: 1.2rem;
  color: #1a202c;
  line-height: 1;
  min-width: 3.5rem;
  text-align: right;
  direction: rtl;
  flex-shrink: 0;
}

.start-divider {
  border: none;
  border-top: 1px solid #e2e8f0;
  margin: 1.5rem 0 0;
}

.start-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  margin-top: 1rem;
  font-size: 0.75rem;
  color: #a0aec0;
}

.footer-copy {
  color: #a0aec0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-sep {
  color: #cbd5e0;
}

.footer-link {
  color: #a0aec0;
  text-decoration: none;
}

.footer-link:hover {
  color: #17B890;
  text-decoration: underline;
}

.start-btn {
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.9rem 3rem;
  background: linear-gradient(135deg, #1de9b6 0%, #17B890 50%, #0d7a60 100%);
  color: #fff;
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(23, 184, 144, 0.5);
  transition: opacity 0.15s;
}

.start-btn:hover {
  opacity: 0.9;
}

/* ================================
   Quiz Screen
================================ */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #2d3748;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timer {
  font-size: 0.95rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: #4a5568;
  background: #fff;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  min-width: 3.5rem;
  text-align: center;
}

.score {
  font-size: 1rem;
  font-weight: 600;
  color: #4a5568;
  background: #fff;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Card */
.card {
  background: #fff;
  border-radius: 1.25rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  padding: 2rem 1.5rem;
}

/* Progress */
.progress-bar-wrap {
  background: #e2e8f0;
  border-radius: 9999px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #1de9b6 0%, #17B890 50%, #0d7a60 100%);
  border-radius: 9999px;
  transition: width 0.4s ease;
  width: 0%;
}

.progress-text {
  text-align: center;
  font-size: 0.85rem;
  color: #718096;
  margin-bottom: 1.5rem;
}

.progress-correct {
  color: #38a169;
  font-weight: 700;
}

.progress-wrong {
  color: #c4827a;
  font-weight: 600;
}

/* Hebrew letter */
.letter-display {
  font-family: 'Frank Ruhl Libre', serif;
  font-size: 8rem;
  line-height: 1.1;
  text-align: center;
  color: #1a202c;
  margin-bottom: 2rem;
  min-height: 10rem;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0;
  user-select: none;
}

/* Choice buttons */
.choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.choice-btn {
  font-size: 1rem;
  font-weight: 600;
  padding: 0.9rem 0.5rem;
  border: 2px solid #e2e8f0;
  border-radius: 0.75rem;
  background: #f7fafc;
  color: #2d3748;
  cursor: pointer;
  transition: border-color 0.15s;
  line-height: 1.3;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

@media (hover: hover) {
  .choice-btn:hover:not(:disabled) {
    background: #E4F9F4;
    border-color: #17B890;
  }
}

.choice-btn:disabled {
  cursor: not-allowed;
}

.choice-btn.correct {
  background: #c6f6d5;
  border-color: #38a169;
  color: #276749;
}

.choice-btn.wrong {
  background: #fed7d7;
  border-color: #e53e3e;
  color: #742a2a;
}

/* Next button */
.next-wrap {
  display: flex;
  justify-content: center;
}

.next-wrap.hidden {
  display: none;
}

.next-btn {
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 2rem;
  background: linear-gradient(135deg, #17B890, #0FA882);
  color: #fff;
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(23, 184, 144, 0.4);
  transition: opacity 0.15s, transform 0.1s;
}

.next-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ================================
   Result Screen
================================ */
#result-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}

.result-card {
  background: #fff;
  border-radius: 1.25rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  padding: 3rem 2rem;
  text-align: center;
  width: 100%;
}

.result-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: #2d3748;
  margin-bottom: 1.75rem;
}

.result-stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 1.25rem;
}

.result-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.result-stat-label {
  font-size: 0.85rem;
  color: #718096;
  font-weight: 500;
}

.result-stat-value {
  font-size: 2.75rem;
  font-weight: 700;
  color: #17B890;
  font-variant-numeric: tabular-nums;
}

.result-detail {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.result-message {
  font-size: 1.05rem;
  color: #718096;
  margin-bottom: 1.5rem;
}

.book-section {
  border-top: 1px solid #e2e8f0;
  margin-top: 1.25rem;
  padding-top: 1.1rem;
  text-align: center;
}

.book-pr {
  font-size: 0.65rem;
  font-weight: 600;
  color: #a0aec0;
  letter-spacing: 0.03em;
}

.book-title-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: #2d3748;
  text-decoration: none;
  line-height: 1.3;
  white-space: nowrap;
}

.book-title-main {
  color: #17B890;
}

@media (max-width: 480px) {
  .book-title-sub { display: none; }
}

.book-title-link:hover .book-title-main {
  text-decoration: underline;
}

.book-author-text {
  font-size: 0.75rem;
  color: #a0aec0;
  margin-top: 0.1rem;
}

.share-buttons {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  color: #fff;
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  flex: 1;
  max-width: 160px;
  transition: opacity 0.15s, transform 0.1s;
}

.share-btn-line {
  background: #06C755;
}

.share-btn-x {
  background: #000;
}

@media (max-width: 480px) {
  .share-btn-line span {
    display: none;
  }

  .share-btn-line {
    max-width: 56px;
    padding: 0.75rem;
  }
}

.share-btn:hover {
  opacity: 0.85;
}

.x-logo, .line-logo {
  width: 1.1rem;
  height: 1.1rem;
  fill: #fff;
  flex-shrink: 0;
}

.result-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.share-section {
  margin-bottom: 0;
}

.share-section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #a0aec0;
  margin-bottom: 0.75rem;
}

.share-section-label::before,
.share-section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #e2e8f0;
}

.retry-btn, .home-btn {
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.retry-btn {
  background: linear-gradient(135deg, #1de9b6 0%, #17B890 50%, #0d7a60 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(23, 184, 144, 0.5);
}

.home-btn {
  background: #e2e8f0;
  color: #4a5568;
}

.retry-btn:hover, .home-btn:hover {
  opacity: 0.85;
}


/* ================================
   Responsive
================================ */
@media (max-width: 400px) {
  .letter-display {
    font-size: 6rem;
    min-height: 8rem;
  }

  .choice-btn {
    font-size: 0.9rem;
    padding: 0.75rem 0.4rem;
  }

  .card {
    padding: 1.5rem 1rem;
  }

  .start-card {
    padding: 2rem 1.25rem;
  }

  .start-title {
    font-size: 1.55rem;
  }

  .result-stats {
    gap: 1.5rem;
  }

  .result-stat-value {
    font-size: 2.25rem;
  }
}