/* ================================================
   学習ページ共通スタイル
   fundamentals.html, database.html, および
   以降の学習ページで使用する共通CSS
   ================================================ */

/* ================================================
   学習ページ ヘッダー & ホームボタン
   ================================================ */

/* ヘッダーバー（青ベース） */
.header {
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--primary-color);
  color: white;
  padding: 0 1rem;
  height: 52px;
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header h1 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  flex: 1;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* ← ホーム ボタン */
.back-button {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: white;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s;
}

.back-button:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: white;
  text-decoration: none;
  color: white;
}

/* ================================================
   ゲーミフィケーション表示
   ================================================ */
/* ゲーミフィケーション表示 */
.gamification-display {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.gamification-stat {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 1rem;
  text-align: center;
  border: 2px solid var(--border-color);
}

.gamification-stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.gamification-stat-value {
  font-size: 2rem;
  font-weight: bold;
  color: var(--primary-color);
  margin: 0.5rem 0;
}

.level-badge {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.progress-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* トピックカード */
.topics-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.topic-card {
  background-color: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  border-color: var(--primary-color);
}

.topic-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.topic-card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.topic-card-button {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  text-align: center;
  font-weight: 600;
  transition: all 0.2s ease;
  margin-top: auto;
  border: none;
  cursor: pointer;
}

.topic-card-button:hover {
  background-color: #2563eb;
  transform: translateY(-2px);
}

/* セクション制御 */
.section {
  display: none;
}

.section.active {
  display: block;
}

/* コンテンツセクション */
#content-section {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.content-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
}

.content-back-button {
  background-color: var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
  border: none;
}

.content-back-button:hover {
  background-color: #d1d5db;
  transform: translateY(-2px);
}

.content-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.content-explanation {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
}

.content-section {
  margin-bottom: 2rem;
}

.content-section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content-section-icon {
  width: 24px;
  height: 24px;
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  border-radius: 50%;
  text-align: center;
  line-height: 24px;
  font-weight: bold;
  font-size: 0.875rem;
}

.examples-list {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  border: 1px solid var(--border-color);
}

.example-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.example-item:last-child {
  border-bottom: none;
}

.example-item-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.example-item-marker {
  color: var(--primary-color);
  font-weight: 600;
  margin-right: 0.5rem;
}

.image-description {
  background-color: #f0f4f8;
  border: 2px dashed var(--primary-color);
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
  margin: 1.5rem 0;
  min-height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quiz-start-button {
  background-color: var(--success-color);
  color: white;
  padding: 1rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-block;
  margin-top: 1.5rem;
}

.quiz-start-button:hover {
  background-color: #059669;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(16, 185, 129, 0.3);
}

/* 問題表示セクション */
#quiz-section {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
}

.quiz-progress {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.quiz-back-button {
  background-color: var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
  border: none;
  font-size: 0.95rem;
}

.quiz-back-button:hover {
  background-color: #d1d5db;
  transform: translateY(-2px);
}

.question-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.options-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.option-button {
  background-color: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 500;
}

.option-button:hover {
  border-color: var(--primary-color);
  background-color: #eff6ff;
  transform: translateX(4px);
}

.option-button.selected {
  background-color: #dbeafe;
  border-color: var(--primary-color);
  box-shadow: inset 0 0 0 2px var(--primary-color);
}

.option-button.correct {
  background-color: #dcfce7;
  border-color: var(--success-color);
}

.option-button.incorrect {
  background-color: #fee2e2;
  border-color: var(--danger-color);
}

.option-button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.submit-button {
  background-color: var(--primary-color);
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-right: 1rem;
}

.submit-button:hover {
  background-color: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.3);
}

.submit-button:disabled {
  background-color: #9ca3af;
  cursor: not-allowed;
  transform: none;
}

/* 解説エリア */
.explanation-container {
  display: none;
  background-color: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.explanation-container.show {
  display: block;
}

.explanation-header {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.explanation-correct {
  color: var(--success-color);
}

.explanation-incorrect {
  color: var(--danger-color);
}

.explanation-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  margin-left: 0.5rem;
}

.explanation-correct .explanation-badge {
  background-color: var(--success-color);
}

.explanation-incorrect .explanation-badge {
  background-color: var(--danger-color);
}

.correct-answer-info {
  margin: 1rem 0;
  padding: 1rem;
  background-color: #ecfdf5;
  border-left: 4px solid var(--success-color);
  border-radius: 4px;
}

.correct-answer-info-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.correct-answer-info-text {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

.explanation-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin: 1rem 0;
}

.gamification-result {
  margin-top: 1rem;
  padding: 1rem;
  background-color: #eff6ff;
  border: 2px solid var(--primary-color);
  border-radius: var(--border-radius);
  text-align: center;
}

.gamification-result-text {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

.streak-bonus {
  color: var(--warning-color);
  font-weight: bold;
}

.level-up {
  color: var(--success-color);
  font-weight: bold;
}

.next-button {
  background-color: var(--primary-color);
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 1rem;
}

.next-button:hover {
  background-color: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.3);
}

/* 完了メッセージ */
#completion-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--border-radius);
  padding: 3rem 2rem;
  text-align: center;
  color: white;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  margin-bottom: 2rem;
}

.completion-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.completion-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.completion-message {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.completion-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.completion-stat-item {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  padding: 1rem;
}

.completion-stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.completion-stat-value {
  font-size: 1.75rem;
  font-weight: 700;
}

.completion-button {
  background-color: white;
  color: #667eea;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  font-size: 1rem;
  margin-top: 1rem;
}

.completion-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* レスポンシブ */
@media (max-width: 768px) {
  .topics-container {
    grid-template-columns: 1fr;
  }

  .gamification-display {
    grid-template-columns: repeat(2, 1fr);
  }

  .content-header,
  .quiz-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .content-title {
    font-size: 1.5rem;
  }

  .question-text {
    font-size: 1.1rem;
  }

  #content-section,
  #quiz-section {
    padding: 1.5rem;
  }

  .completion-title {
    font-size: 1.5rem;
  }
}

/* ドメインカードスタイル（過去問ページ用） */
.domains-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.domain-card {
  background-color: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
}

.domain-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  border-color: var(--primary-color);
}

.domain-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.domain-card-count {
  font-size: 1.75rem;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.domain-card-button {
  background-color: var(--primary-color);
  color: white;
  padding: 0.6rem 1.2rem;
  border-radius: var(--border-radius);
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: auto;
}

.domain-card-button:hover {
  background-color: #2563eb;
  transform: translateY(-2px);
}

/* Back mini button styling */
.back-mini-button {
  background-color: var(--border-color, #e5e7eb);
  color: var(--text-primary, #1f2937);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius, 8px);
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.95rem;
}

.back-mini-button:hover {
  background-color: #d1d5db;
  transform: translateY(-2px);
}

.back-mini-button:active {
  transform: translateY(0);
}