:root {
    --accent-color: #2899B2;
    --accent-color-rgb: 40, 153, 178;
}

/* ページヘッダー - clubs ページと統一 */
.page_header {
    width: 100%;
    max-width: 1024px;
    margin: 100px auto 0;
    padding: 0 1rem;
}

.page_header h2 {
    margin-bottom: 1.25rem;
    font-size: 2.25rem;
    font-weight: bold;
}

/* コンテナ - clubs ページと統一 */
.container {
    width: 100%;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 絞り込みフォーム */
.feature-filter-form {
    background-color: #f9fafb;
    border-radius: 1rem;
    padding: 1.5rem;
    margin: 2rem 0;
    border: 1px solid #e5e7eb;
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-item {
    flex: 1 1 200px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-item label {
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
}

.filter-item select {
    padding: 0.625rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    background-color: white;
    font-size: 0.875rem;
    color: #374151;
    cursor: pointer;
    transition: border-color 0.2s;
}

.filter-item select:hover {
    border-color: #9ca3af;
}

.filter-item select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color-rgb), 0.1);
}

.filter-submit {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    align-items: flex-end;
    justify-content: flex-start;
}

.filter-button {
    flex: 1;
    padding: 0.625rem 1rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.filter-button:hover {
    background-color: #1e7a8c;
}

.filter-reset {
    padding: 0.625rem 1.5rem;
    background-color: transparent;
    color: #6b7280;
    text-decoration: none;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-reset:hover {
    background-color: #f3f4f6;
    color: #374151;
}

/* 特集記事リスト - 縦1列 */
.featured-articles-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0 3rem;
}

/* featured-articles.css のスタイルをインポート */
.featured-article-card {
    position: relative;
    overflow: hidden;
    border-radius: 1rem;
    transition: all 0.3s;
    max-width: 100%;
}

.featured-article-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

/* サムネイルラッパー */
.featured-thumbnail-wrapper {
    position: relative;
    aspect-ratio: 21/9; /* 横長のアスペクト比 */
    overflow: hidden;
}

/* サムネイル */
.featured-thumbnail {
    width: 100%;
    height: 100%;
    position: relative;
}

.featured-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.featured-article-card:hover .featured-thumbnail img {
    transform: scale(1.05);
}

.featured-thumbnail.no-image {
    position: relative;
}

.featured-thumbnail.no-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* オーバーレイ */
.featured-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.7) 50%, transparent 100%);
    padding: 2rem;
    color: white;
}

.featured-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* タイトル */
.featured-title {
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1.3;
    margin: 0;
    color: white;
}

/* 抜粋 */
.featured-excerpt {
    font-size: 0.9rem;
    line-height: 1.6;
    opacity: 0.9;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
}

/* 学校情報 */
.featured-school-info {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.school-badge,
.club-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ページネーション - clubs ページのスタイルを踏襲 */
.pagination {
    margin: 3rem 0;
}

.pagination .nav-links {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.pagination a,
.pagination span {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 999px;
    color: #4b5563;
    text-decoration: none;
    line-height: 1;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.pagination a:hover {
    background-color: rgba(var(--accent-color-rgb), 0.1);
    color: var(--accent-color);
}

.pagination .current {
    border-color: var(--accent-color);
    background-color: var(--accent-color);
    color: #fff;
}

/* 記事がない場合 */
.no-features {
    text-align: center;
    padding: 4rem 2rem;
    color: #6b7280;
}

.no-features p {
    font-size: 1.125rem;
}

/* タブレット対応 */
@media (min-width: 768px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* デスクトップ対応 */
@media (min-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
}

/* モバイル対応 */
@media (max-width: 767px) {
    .page_header {
        margin-top: 80px;
    }
    
    .featured-thumbnail-wrapper {
        aspect-ratio: 4/3; /* モバイルでは縦長の比率に */
    }
    
    .featured-overlay {
        padding: 1.5rem;
    }
    
    .featured-title {
        font-size: 1.25rem;
    }
    
    .featured-excerpt {
        font-size: 0.85rem;
    }
    
    /* フィルターフォームのモバイル対応 */
    .filter-row {
        flex-direction: column;
    }
    
    .filter-item {
        flex: 1 1 100%;
    }
    
    .filter-submit {
        flex-direction: column;
        width: 100%;
    }
    
    .filter-button,
    .filter-reset {
        width: 100%;
        text-align: center;
    }
}

/* さらに狭い画面用 */
@media (max-width: 480px) {
    .featured-thumbnail-wrapper {
        aspect-ratio: 3/4; /* 縦長の比率 */
    }
    
    .featured-overlay {
        padding: 1rem;
    }
    
    .featured-title {
        font-size: 1.125rem;
    }
}