/**
 * Section Selector CSS
 * TOEIC Vocabulary List - UI v1
 *
 * セクション選択システムのスタイル
 */

/* ==========================================
   Section Selector Container
   ========================================== */

.section-selector {
  max-width: var(--container-max-width, 1200px);
  width: calc(100% - 32px);
  margin: var(--spacing-md, 16px) auto;
  padding: 16px;
  background-color: var(--color-bg-card, #ffffff);
  border: 1px solid var(--color-border, #e5e7eb);
  border-radius: var(--radius-md, 8px);
}

/* ヘッダー部分 */
.section-selector-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md, 16px);
  flex-wrap: wrap;
  gap: var(--spacing-sm, 12px);
}

.section-selector-label {
  font-weight: 600;
  color: var(--color-text-primary, #111827);
  font-size: 16px;
}

/* アクションボタン（全選択/クリア） */
.section-selector-actions {
  display: flex;
  gap: 8px;
}

.section-action-btn {
  padding: 6px 12px;
  border: 1px solid var(--color-border, #e5e7eb);
  background-color: var(--color-bg-secondary, #f9fafb);
  color: var(--color-text-secondary, #6b7280);
  border-radius: var(--radius-sm, 6px);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast, 0.15s) ease;
}

.section-action-btn:hover {
  background-color: var(--color-bg-hover, #f3f4f6);
  border-color: var(--color-primary, #3b82f6);
  color: var(--color-primary, #3b82f6);
}

.section-action-btn:active {
  transform: scale(0.98);
}

/* ==========================================
   Checkbox Container
   ========================================== */

.section-checkbox-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--spacing-md, 16px);
}

/* チェックボックスアイテム */
.section-checkbox-item {
  position: relative;
}

/* 実際のcheckboxを隠す */
.section-checkbox-item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

/* カスタムチェックボックス（ラベルをボタン風に） */
.section-checkbox-label {
  display: inline-block;
  padding: 8px 14px;
  border: 2px solid var(--color-border, #e5e7eb);
  background-color: var(--color-bg-card, #ffffff);
  color: var(--color-text-secondary, #6b7280);
  border-radius: var(--radius-sm, 6px);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast, 0.15s) ease;
  user-select: none;
  white-space: nowrap;
}

.section-checkbox-label:hover {
  border-color: var(--color-primary, #3b82f6);
  background-color: var(--color-primary-light, #eff6ff);
  color: var(--color-primary, #3b82f6);
}

/* チェック済みのスタイル */
.section-checkbox-item input[type="checkbox"]:checked + .section-checkbox-label {
  background-color: var(--color-primary, #3b82f6);
  border-color: var(--color-primary-dark, #2563eb);
  color: white;
}

.section-checkbox-item input[type="checkbox"]:checked + .section-checkbox-label:hover {
  background-color: var(--color-primary-dark, #2563eb);
}

/* フォーカス状態 */
.section-checkbox-item input[type="checkbox"]:focus + .section-checkbox-label {
  outline: 2px solid var(--color-primary, #3b82f6);
  outline-offset: 2px;
}

/* ==========================================
   Footer - 選択情報
   ========================================== */

.section-selector-footer {
  padding-top: var(--spacing-sm, 12px);
  border-top: 1px solid var(--color-border, #e5e7eb);
}

.section-count-info {
  font-size: 14px;
  color: var(--color-text-secondary, #6b7280);
  display: flex;
  align-items: center;
  gap: 4px;
}

.section-count-info span {
  font-weight: 600;
  color: var(--color-primary, #3b82f6);
}

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

@media (max-width: 768px) {
  .section-selector {
    padding: var(--spacing-sm, 12px);
  }

  .section-selector-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-selector-actions {
    width: 100%;
  }

  .section-action-btn {
    flex: 1;
  }

  .section-checkbox-label {
    padding: 6px 12px;
    font-size: 13px;
  }

  .section-count-info {
    font-size: 13px;
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .section-checkbox-label {
    padding: 5px 10px;
    font-size: 12px;
  }

  .section-action-btn {
    font-size: 12px;
    padding: 5px 10px;
  }
}