/* 講座カードコンポーネント */
.course-card {
  display: flex;
  background: var(--color-white, #fff);
  border: 1px solid var(--color-gray-border, #e0e0e0);
  border-radius: 12px;
  overflow: visible;
  box-shadow: 0 4px 12px var(--color-shadow-base, rgba(0, 0, 0, 0.1));
  transition: box-shadow 0.3s ease;
  margin-bottom: var(--spacing-lg, 24px);
  margin-left: auto;
  margin-right: auto;
  max-width: 1200px;
  width: 100%;
}

.course-card:hover {
  box-shadow: 0 8px 24px var(--color-shadow-primary, rgba(40, 96, 160, 0.15));
}

/* 左半分: 画像エリア */
.course-card__image {
  flex: 0 0 50%;
  position: relative;
  min-height: 300px;
  background: var(--color-white, #fff);
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-card__image img {
  width: 80%;
  height: auto;
  object-fit: contain;
  max-height: 80%;
}

/* 右半分: コンテンツエリア */
.course-card__content {
  flex: 1;
  padding: var(--spacing-xl, 40px);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 24px);
  position: relative;
}

.course-card__title {
  color: var(--color-primary, #2860A0);
  font-size: 1.5rem;
  font-weight: bold;
  line-height: 1.3;
  margin: 0;
}

.course-card__tag {
  display: inline;
  background: rgba(40, 96, 160, 0.1);
  color: var(--color-primary, #2860A0);
  font-size: 1rem;
  font-weight: 600;
  padding: var(--spacing-xs, 4px) var(--spacing-sm, 8px);
  border-radius: 16px;
  margin-bottom: var(--spacing-sm, 8px);
  width: auto;
  max-width: fit-content;
}

.course-card__description {
  color: var(--color-black, #333);
  font-size: var(--font-size-sm, 1rem);
  line-height: 1.6;
  margin: 0;
}

/* トピックカードエリア */
.course-card__topics {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm, 8px);
  position: relative;
  z-index: 1;
}

/* 個別トピックカード */
.topic-card {
  background: var(--color-white, #fff);
  border: 1px solid var(--color-gray-border, #e0e0e0);
  border-radius: 8px;
  overflow: visible;
  position: relative;
  z-index: 1;
}

.topic-card.is-open {
  z-index: 10000; /* 開いたときは最上位に */
}

.topic-card__header {
  padding: var(--spacing-md, 16px);
  cursor: pointer;
  background: var(--color-white, #fff);
  border: none;
  width: 100%;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s ease;
  font-size: var(--font-size-md, 1rem);
  font-weight: 600;
  color: var(--color-black, #333);
}

.topic-card__title-area {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm, 8px);
}

.topic-card__icon {
  width: 1.2rem;
  height: 1.2rem;
  flex-shrink: 0;
}

.topic-card__title {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  color: inherit;
}

.topic-card__header:hover {
  background: var(--color-gray-menu-bg, #f8f9fa);
}

.topic-card__toggle {
  font-size: 1.2rem;
  color: var(--color-primary, #2860A0);
  transition: transform 0.3s ease;
}

.topic-card.is-open .topic-card__toggle {
  transform: rotate(180deg);
}

.topic-card__detail {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-white, #fff);
  border: 1px solid var(--color-gray-border, #e0e0e0);
  border-top: none;
  border-radius: 0 0 8px 8px;
  max-height: 0;
  overflow: hidden;
  padding: 0;
  border-width: 0;
  box-shadow: none;
  z-index: 99999;
}

.topic-card.is-open .topic-card__detail {
  max-height: 300px;
  padding: var(--spacing-md, 16px);
  border-width: 1px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.topic-card__detail-text {
  color: var(--color-black, #333);
  font-size: var(--font-size-sm, 0.875rem);
  line-height: 1.5;
  margin: 0;
}

/* タブレット対応 */
@media (max-width: 1024px) {
  .course-card {
    max-width: 700px;
  }
  
  .course-card__content {
    padding: var(--spacing-lg, 24px);
    gap: var(--spacing-md, 16px);
  }
  
  .course-card__title {
    font-size: 1.25rem;
  }
  
  .course-card__tag {
    font-size: 0.875rem;
    padding: var(--spacing-xs, 4px) var(--spacing-xs, 4px);
  }
  
  .course-card__description {
    font-size: var(--font-size-sm, 0.875rem);
  }
}

/* スマホ対応 */
@media (max-width: 768px) {
  .course-card {
    flex-direction: column;
    max-width: 100%;
  }
  
  .course-card__image {
    flex: none;
    min-height: 200px;
    background: var(--color-white, #fff);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .course-card__image img {
    width: 80%;
    height: auto;
    object-fit: contain;
    max-height: 80%;
  }
  
  .course-card__content {
    padding: var(--spacing-lg, 24px);
    gap: var(--spacing-md, 16px);
  }
  
  .course-card__title {
    font-size: 1.125rem;
  }
  
  .course-card__tag {
    font-size: 0.8rem;
    padding: var(--spacing-xs, 4px) var(--spacing-xs, 4px);
  }
  
  .course-card__description {
    font-size: var(--font-size-sm, 0.875rem);
  }
  
  .topic-card__header {
    padding: var(--spacing-sm, 8px) var(--spacing-md, 16px);
    font-size: var(--font-size-sm, 0.875rem);
  }
  
  /* スマホでも確実に非表示 */
  .topic-card__detail {
    max-height: 0;
    padding: 0;
    border-width: 0;
    box-shadow: none;
  }
  
  .topic-card.is-open .topic-card__detail {
    padding: var(--spacing-sm, 8px) var(--spacing-md, 16px);
  }
}

/* 極小スマホ対応 */
@media (max-width: 480px) {
  .course-card__image {
    min-height: 180px;
    background: var(--color-white, #fff);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .course-card__image img {
    width: 80%;
    height: auto;
    object-fit: contain;
    max-height: 80%;
  }
  
  .course-card__content {
    padding: var(--spacing-md, 16px);
    gap: var(--spacing-sm, 8px);
  }
  
  .course-card__title {
    font-size: 1rem;
  }
  
  .course-card__tag {
    font-size: 0.75rem;
    padding: var(--spacing-xs, 4px) var(--spacing-xs, 4px);
  }
  
  .course-card__description {
    font-size: 0.8rem;
  }
}