/**
 * SEO強化スタイル
 * Version: 1.0.0
 * figure/figcaption、関連コンテンツなどSEO関連要素のスタイル
 */

/* ========================================
   Figure & Figcaption（画像SEO強化）
   ======================================== */

figure {
    margin: 2rem 0;
    padding: 0;
    display: block;
}

figure img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-md, 12px);
    box-shadow: var(--shadow-md, 0 4px 16px rgba(0, 0, 0, 0.08));
}

figcaption {
    margin-top: 0.75rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary, #4A5568);
    text-align: center;
    line-height: 1.6;
    font-style: italic;
    background: var(--color-background, #F7FAFC);
    border-radius: var(--border-radius-sm, 8px);
}

@media (max-width: 768px) {
    figure {
        margin: 1.5rem 0;
    }
    
    figcaption {
        font-size: 0.8125rem;
        padding: 0.375rem 0.75rem;
    }
}

/* ========================================
   関連コンテンツセクション
   ======================================== */

.related-content-section {
    background: var(--color-background, #F7FAFC);
    padding: clamp(60px, 10vw, 100px) 0;
    margin-top: clamp(40px, 8vw, 80px);
}

.related-content-title {
    text-align: center;
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 600;
    color: var(--color-text-primary, #1A202C);
    margin-bottom: 1rem;
}

.related-content-subtitle {
    text-align: center;
    font-size: clamp(0.95rem, 2vw, 1.125rem);
    color: var(--color-text-secondary, #4A5568);
    margin-bottom: clamp(2rem, 5vw, 3rem);
}

.related-content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(16px, 4vw, 24px);
}

@media (max-width: 768px) {
    .related-content-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

/* 関連コンテンツカード */
.related-card {
    background: var(--color-surface, #FFFFFF);
    border-radius: var(--border-radius-lg, 16px);
    overflow: hidden;
    box-shadow: var(--shadow-md, 0 4px 16px rgba(0, 0, 0, 0.08));
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-top: 4px solid var(--color-primary, #2C7A7B);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.related-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl, 0 12px 32px rgba(0, 0, 0, 0.12));
}

.related-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.related-card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.related-card-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary, #2C7A7B);
    background: var(--color-primary-lighter, #81E6D9);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    margin-bottom: 0.75rem;
    width: fit-content;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.related-card-title {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    font-weight: 600;
    color: var(--color-text-primary, #1A202C);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.related-card-description {
    font-size: 0.9375rem;
    color: var(--color-text-secondary, #4A5568);
    line-height: 1.7;
    margin-bottom: 1.25rem;
    flex: 1;
}

.related-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary, #2C7A7B);
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.related-card-link:hover {
    color: var(--color-primary-dark, #234E52);
    gap: 0.75rem;
}

.related-card-link i {
    font-size: 0.875rem;
    transition: transform 0.3s ease;
}

.related-card-link:hover i {
    transform: translateX(4px);
}

@media (max-width: 768px) {
    .related-card-image {
        height: 180px;
    }
    
    .related-card-content {
        padding: 1.25rem;
    }
}

/* ========================================
   セマンティックHTML要素の基本スタイル
   ======================================== */

/* main要素 - デフォルトでは既存デザインを維持 */
main {
    display: block;
    /* 既存のコンテンツスタイルを継承 */
}

/* article要素 */
article {
    display: block;
}

/* aside要素 */
aside {
    display: block;
}

/* ========================================
   アクセシビリティ対応
   ======================================== */

/* スキップリンク改善 */
.skip-link:focus {
    outline: 3px solid var(--color-primary, #2C7A7B);
    outline-offset: 2px;
}

/* ========================================
   印刷時の最適化
   ======================================== */

@media print {
    figure {
        page-break-inside: avoid;
    }
    
    figcaption {
        font-style: normal;
        color: #000;
        background: none;
    }
    
    .related-content-section {
        display: none;
    }
}