/*
 * Learning Page Styles
 * 統一されたタイポグラフィシステムと8の倍数ルールを適用
 * CSS Subgridを使用した洗練されたレイアウト
 */

.learning-content__inner {
    padding-top: var(--space-64);
    padding-bottom: var(--space-80);
}

.learning-content__text {
    max-width: 80rem;
    margin: 0 auto var(--space-64);
    font-size: var(--font-size-base);
    line-height: var(--line-height-loose);
}

.learning-content__text p {
    margin-bottom: var(--space-24);
}

.learning-schema {
    background-color: var(--color-background);
    padding: var(--space-64) 0;
    margin-bottom: var(--space-64);
}

.learning-schema__title {
    text-align: center;
    font-family: var(--font-family-heading);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-48);
    font-weight: 400;
    color: var(--color-text-primary);
}

.learning-schema__diagram {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    grid-template-rows: subgrid;
    gap: var(--space-48);
    align-items: center;
    max-width: 90rem;
    margin-inline: auto;
}

.learning-schema__card {
    border: 1px solid var(--color-border);
    padding: var(--space-32);
    text-align: center;
    background-color: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    /* Subgridを使用してカードの高さを統一 */
    display: grid;
    grid-template-rows: auto 1fr;
    grid-template-rows: subgrid;
    grid-row: span 2;
    /* フォールバック: Subgridをサポートしないブラウザ用 */
    height: 100%;
    min-height: 25rem;
}

.learning-schema__card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.learning-schema__card-header {
    grid-row: 1;
    margin-bottom: var(--space-24);
}

.learning-schema__card-title {
    font-family: var(--font-family-heading);
    font-size: 1em;
    font-weight: 700;
    margin-bottom: 0;
    color: var(--color-text-primary);
}

.learning-schema__card-content {
    grid-row: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.learning-schema__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
}

.learning-schema__item {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

.learning-schema__description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin: 0;
}

.learning-schema__connector {
    grid-row: span 2;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
}

.learning-schema__plus {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-xxl);
    font-weight: 400;
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 6rem;
    height: 6rem;
    border: 2px solid var(--color-accent);
    border-radius: 50%;
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

/* Subgridをサポートしないブラウザ用のフォールバック */
@supports not (grid-template-rows: subgrid) {
  .learning-schema__diagram {
    grid-template-rows: 1fr;
    align-items: stretch;
  }
  
  .learning-schema__card {
    display: flex;
    flex-direction: column;
    grid-template-rows: auto;
    grid-row: auto;
  }
  
  .learning-schema__card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  
  .learning-schema__connector {
    grid-row: auto;
    align-self: center;
  }
}

.learning-content__outro {
    text-align: center;
    font-size: var(--font-size-base);
    line-height: var(--line-height-loose);
    color: var(--color-text-secondary);
}

.learning-content__outro .link {
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-normal);
}

.learning-content__outro .link:hover {
    color: var(--color-primary);
}

@media (max-width: 768px) {
    .learning-schema__diagram {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: var(--space-32);
    }
    
    .learning-schema__card {
        max-width: 32rem;
        margin-inline: 0;
        grid-row: auto;
        text-align: left;
    }
    
    .learning-schema__connector {
        grid-row: auto;
        order: 2;
    }
    
    .learning-schema__card:last-child {
        order: 3;
    }

    .learning-content__text,
    .learning-schema__title,
    .learning-content__outro {
        text-align: left;
    }

    .learning-content__text {
        margin-inline: 0;
    }
}