/* --- アーカイブ全体のレイアウト --- */
.nenga-archive-section {
    margin-bottom: 4rem;
    color: #eee;
}

.nenga-year-title {
    font-size: 1.8rem;
    font-weight: bold;
    color: #fff;
    border-bottom: 2px solid #555;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.nenga-content {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

/* --- 画像エリア --- */
.nenga-visual-area {
    flex: 1 1 300px;
    max-width: 400px;
}

.nenga-main-figure {
    margin: 0 0 15px 0;
    text-align: center;
}

.nenga-main-image {
    max-width: 80%;
    height: auto;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    border-radius: 4px; /* 軽く角を丸くすると現代的に見えます */
}

/* --- サムネイル設定 --- */
.nenga-thumbnail-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0;
    margin: 0;
    list-style: none;
    justify-content: center;
}

.nenga-thumbnail-btn {
    width: 60px;
    height: 90px;
    padding: 0;
    border: 2px solid transparent;
    background: none;
    cursor: pointer;
    overflow: hidden;
    transition: 0.2s;
}

.nenga-thumbnail-btn img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.nenga-thumbnail-btn:hover {
    opacity: 0.8;
}

.nenga-thumbnail-btn.is-active {
    border-color: #fff;
}

/* --- テキストエリア --- */
.nenga-description-area {
    flex: 1 1 400px;
    font-size: 1rem;
    line-height: 1.8;
}

.nenga-description-area a {
    color: #8ab4f8;
    text-decoration: underline;
}

/* --- モバイル対応 --- */
@media (max-width: 768px) {
    .nenga-content {
        flex-direction: column;
    }
    .nenga-visual-area {
        max-width: 100%;
    }
}