/* === バックナンバー 年代別 詳細カードリスト (D案) === */

.sn-bn-archive {
    margin: 1.5rem 0 2.5rem;
    font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
}

/* 年代フィルタ ─ 上部タブ */
.sn-bn-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px dashed #d4c4ae;
}
.sn-bn-filter__btn {
    font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
    background: #fff;
    border: 1px solid #d4c4ae;
    color: #5a5650;
    font-size: 0.92rem;
    padding: 0.45rem 1rem;
    border-radius: 999px;
    cursor: pointer;
    transition: background .15s, color .15s, border-color .15s, transform .15s;
    letter-spacing: 0.03em;
}
.sn-bn-filter__btn:hover {
    background: #f5efe4;
    border-color: #2f8fa6;
    color: #2f8fa6;
}
.sn-bn-filter__btn.is-active {
    background: #2f8fa6;
    color: #fff;
    border-color: #2f8fa6;
    font-weight: 600;
}

.sn-bn-section {
    margin: 0 0 2.4rem;
}

.sn-bn-section__title {
    font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
    font-size: 1.3rem;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0 0 1rem;
    padding-left: 0.8rem;
    border-left: 4px solid #2f8fa6;
    letter-spacing: 0.05em;
    line-height: 1.3;
}

/* 縦型大判カードのグリッド（表紙を大きく・自動列数） */
.sn-bn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 22px;
}

/* カード本体（縦並び：大きな表紙 → 文字を下に） */
.sn-bn-card {
    display: flex;
    flex-direction: column;
    background: #fff;
    border: 1px solid #ead7c4;
    border-radius: 10px;
    overflow: hidden;
    text-decoration: none !important;
    color: #2a2622;
    transition: transform .18s, box-shadow .18s, border-color .18s;
}
.sn-bn-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(47, 143, 166, .18);
    border-color: #2f8fa6;
}

/* 大きな表紙（カード上部いっぱい・縦長3:4） */
.sn-bn-card__cover {
    display: block;
    width: 100%;
    aspect-ratio: 3 / 4;
    background: #f5f3ee;
    overflow: hidden;
}
.sn-bn-card__cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 文字は画像の下・中央寄せ・大きめ（お年寄り配慮） */
.sn-bn-card__body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 14px 12px 18px;
    text-align: center;
    min-width: 0;
}
.sn-bn-card__label {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0;
    line-height: 1.3;
}
.sn-bn-card__date {
    display: block;
    font-size: 0.95rem;
    color: #8a8378;
    margin: 0;
    line-height: 1.3;
    font-family: "Hiragino Maru Gothic ProN", "Yu Gothic", sans-serif;
    letter-spacing: 0.04em;
}
.sn-bn-card__feature {
    font-size: 1.02rem;
    color: #5a5650;
    margin: 3px 0 0;
    line-height: 1.6;
    /* 3行で省略 */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 横長表紙（No.18写真集など）は横長アスペクトに */
.sn-bn-card--landscape .sn-bn-card__cover {
    aspect-ratio: 4 / 3;
}

/* スマホ：2列を維持しつつ表紙は大きく */
@media (max-width: 600px) {
    .sn-bn-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
    }
    .sn-bn-card__label { font-size: 1.05rem; }
    .sn-bn-card__date { font-size: 0.85rem; }
    .sn-bn-card__feature { font-size: 0.92rem; }
    .sn-bn-section__title { font-size: 1.15rem; }
}

/* ============================================================
   表示形式の切り替え（ツールバー＋4ビュー）
   ============================================================ */
.sn-bn-toolbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 12px;
    margin-bottom: 1rem;
}
.sn-bn-toolbar__label {
    font-size: 0.9rem;
    color: #8a8378;
    letter-spacing: 0.04em;
}
.sn-bn-views {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.sn-bn-view {
    font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
    background: #fff;
    border: 1px solid #d4c4ae;
    color: #5a5650;
    font-size: 0.92rem;
    padding: 0.42rem 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background .15s, color .15s, border-color .15s;
    letter-spacing: 0.03em;
}
.sn-bn-view:hover { background: #f5efe4; border-color: #2f8fa6; color: #2f8fa6; }
.sn-bn-view.is-active {
    background: #2f8fa6;
    color: #fff;
    border-color: #2f8fa6;
    font-weight: 600;
}

/* --- ② 大きく（1行に1号・横並び大判） --- */
.sn-bn-archive.is-view-large .sn-bn-grid { grid-template-columns: 1fr; gap: 18px; }
.sn-bn-archive.is-view-large .sn-bn-card { flex-direction: row; align-items: stretch; }
.sn-bn-archive.is-view-large .sn-bn-card__cover { width: 210px; flex: 0 0 210px; aspect-ratio: 3 / 4; }
.sn-bn-archive.is-view-large .sn-bn-card--landscape .sn-bn-card__cover { width: 300px; flex: 0 0 300px; aspect-ratio: 4 / 3; align-self: center; }
.sn-bn-archive.is-view-large .sn-bn-card__body {
    align-items: flex-start;
    text-align: left;
    justify-content: center;
    padding: 22px 26px;
    gap: 8px;
}
.sn-bn-archive.is-view-large .sn-bn-card__label { font-size: 1.5rem; }
.sn-bn-archive.is-view-large .sn-bn-card__date { font-size: 1rem; }
.sn-bn-archive.is-view-large .sn-bn-card__feature { font-size: 1.15rem; -webkit-line-clamp: 4; }

/* --- ③ リスト（コンパクト・1行1号・小サムネ） --- */
.sn-bn-archive.is-view-list .sn-bn-grid { grid-template-columns: 1fr; gap: 0; }
.sn-bn-archive.is-view-list .sn-bn-card {
    flex-direction: row;
    align-items: center;
    border-radius: 0;
    border-width: 0 0 1px 0;
    gap: 0;
}
.sn-bn-archive.is-view-list .sn-bn-card:hover { transform: none; box-shadow: none; background: #f5efe4; border-color: #ead7c4; }
.sn-bn-archive.is-view-list .sn-bn-card__cover { width: 48px; flex: 0 0 48px; aspect-ratio: 3 / 4; margin: 8px 14px 8px 0; border-radius: 3px; }
.sn-bn-archive.is-view-list .sn-bn-card--landscape .sn-bn-card__cover { aspect-ratio: 4 / 3; }
.sn-bn-archive.is-view-list .sn-bn-card__body {
    flex-direction: row;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 4px 16px;
    text-align: left;
    padding: 10px 6px;
    flex: 1;
}
.sn-bn-archive.is-view-list .sn-bn-card__label { font-size: 1.1rem; flex: 0 0 7.5em; }
.sn-bn-archive.is-view-list .sn-bn-card__date { font-size: 0.9rem; flex: 0 0 7em; }
.sn-bn-archive.is-view-list .sn-bn-card__feature { font-size: 1rem; -webkit-line-clamp: 1; flex: 1 1 220px; margin: 0; }

/* --- ④ 表紙ウォール（表紙中心・多数を一覧） --- */
.sn-bn-archive.is-view-cover .sn-bn-grid { grid-template-columns: repeat(auto-fill, minmax(108px, 1fr)); gap: 12px; }
.sn-bn-archive.is-view-cover .sn-bn-card__date,
.sn-bn-archive.is-view-cover .sn-bn-card__feature { display: none; }
.sn-bn-archive.is-view-cover .sn-bn-card__body { padding: 6px 4px 9px; gap: 0; }
.sn-bn-archive.is-view-cover .sn-bn-card__label { font-size: 0.86rem; }

/* 目次ページ画像は通常ビューでは非表示（「目次」ビューのみ表示） */
.sn-bn-card__toc { display: none; }

/* --- ⑤ 目次（誌面の目次ページを大きく・1行1号・画像のみ） --- */
.sn-bn-archive.is-view-toc .sn-bn-grid { grid-template-columns: 1fr; gap: 28px; }
.sn-bn-archive.is-view-toc .sn-bn-card {
    flex-direction: column;
    background: transparent;
    border: 0;
    border-radius: 0;
}
.sn-bn-archive.is-view-toc .sn-bn-card:hover { transform: none; box-shadow: none; }
/* 表紙・文字情報は隠し、目次ページ画像だけを大きく */
.sn-bn-archive.is-view-toc .sn-bn-card__cover,
.sn-bn-archive.is-view-toc .sn-bn-card__body { display: none; }
.sn-bn-archive.is-view-toc .sn-bn-card__toc {
    display: block;
    width: 100%;
    max-width: 820px;
    margin: 0 auto;
}
.sn-bn-archive.is-view-toc .sn-bn-card__toc img {
    width: 100%;
    height: auto;
    display: block;
    border: 1px solid #ead7c4;
    border-radius: 6px;
    box-shadow: 0 3px 12px rgba(0, 0, 0, .12);
    background: #fff;
    transition: box-shadow .18s, border-color .18s;
}
.sn-bn-archive.is-view-toc .sn-bn-card:hover .sn-bn-card__toc img {
    border-color: #2f8fa6;
    box-shadow: 0 6px 18px rgba(47, 143, 166, .22);
}
/* 目次画像が無い号のための控えめなフォールバック表示 */
.sn-bn-archive.is-view-toc .sn-bn-card:not(:has(.sn-bn-card__toc)) {
    display: none;
}

@media (max-width: 600px) {
    /* スマホでは「大きく」「リスト」もカバー幅を抑える */
    .sn-bn-archive.is-view-large .sn-bn-card__cover { width: 120px; flex: 0 0 120px; }
    .sn-bn-archive.is-view-large .sn-bn-card--landscape .sn-bn-card__cover { width: 150px; flex: 0 0 150px; }
    .sn-bn-archive.is-view-large .sn-bn-card__label { font-size: 1.2rem; }
    .sn-bn-archive.is-view-large .sn-bn-card__feature { font-size: 1rem; }
    .sn-bn-archive.is-view-list .sn-bn-card__label { flex-basis: 100%; }
    .sn-bn-archive.is-view-cover .sn-bn-grid { grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); }
}