/* ==========================================================================
   曲目DB (hogaku_song) スタイル
   ========================================================================== */

/* ---- アーカイブヘッダー ---- */
.hogaku-archive-header {
    text-align: center;
    padding: 2.5rem 0 1.5rem;
}

.hogaku-archive-header__title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--towa-heading);
    margin: 0 0 0.5rem;
    font-family: var(--towa-font-heading);
}

.hogaku-archive-header__desc {
    color: var(--towa-text-light);
    font-size: 0.95rem;
    margin: 0;
}

/* ---- フィルター ---- */
.hogaku-filters {
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--towa-bg-alt);
    border-radius: var(--towa-radius-md);
}

.hogaku-filters__group {
    margin-bottom: 0.75rem;
}

.hogaku-filters__group:last-child {
    margin-bottom: 0;
}

.hogaku-filters__label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--towa-text-light);
    margin-bottom: 0.5rem;
    margin-right: 0.5rem;
}

.hogaku-filters__tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.hogaku-filters__tab {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.35rem 0.8rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--towa-text-light);
    background: var(--towa-bg);
    border: 1px solid var(--towa-border);
    border-radius: 100px;
    text-decoration: none;
    transition: all var(--towa-transition);
    white-space: nowrap;
}

.hogaku-filters__tab:hover {
    color: var(--towa-primary);
    border-color: var(--towa-primary);
}

.hogaku-filters__tab--active {
    color: #fff;
    background: var(--towa-primary);
    border-color: var(--towa-primary);
}

.hogaku-filters__tab--active:hover {
    color: #fff;
}

.hogaku-filters__tab-icon {
    font-size: 0.9rem;
}

/* ---- 曲カードグリッド ---- */
.hogaku-songs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.hogaku-songs-grid--related {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

/* ---- 曲カード ---- */
.hogaku-card {
    background: var(--towa-bg);
    border: 1px solid var(--towa-border);
    border-radius: var(--towa-radius-md);
    transition: box-shadow var(--towa-transition), transform var(--towa-transition);
    overflow: hidden;
}

.hogaku-card:hover {
    box-shadow: var(--towa-shadow-md);
    transform: translateY(-2px);
}

.hogaku-card__link {
    display: block;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
}

.hogaku-card__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.hogaku-card__title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--towa-heading);
    margin: 0;
    line-height: var(--towa-line-height-heading);
    flex: 1;
}

.hogaku-card__play {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: #ff0000;
    color: #fff;
    border-radius: 50%;
    font-size: 0.65rem;
    flex-shrink: 0;
}

.hogaku-card__composer {
    font-size: 0.8rem;
    color: var(--towa-text-light);
    margin: 0 0 0.75rem;
}

.hogaku-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.hogaku-card__instruments {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.hogaku-card__instrument {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    font-size: 0.8rem;
}

.hogaku-card__instrument-name {
    font-size: 0.75rem;
    color: var(--towa-text-light);
}

/* 難易度バッジ */
.hogaku-card__difficulty {
    display: inline-block;
    padding: 0.15rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 100px;
    white-space: nowrap;
    flex-shrink: 0;
}

.hogaku-card__difficulty--beginner {
    background: #E6F7F1;
    color: #1B7A4E;
}

.hogaku-card__difficulty--elementary {
    background: #E6F0FF;
    color: #2B5EA7;
}

.hogaku-card__difficulty--intermediate {
    background: #FFF8E6;
    color: #B7791F;
}

.hogaku-card__difficulty--advanced {
    background: #FDE8E8;
    color: #C53030;
}

.hogaku-card__difficulty--concert {
    background: #F3E8FF;
    color: #6B21A8;
}

.hogaku-card__comment {
    font-size: 0.85rem;
    color: var(--towa-text-light);
    line-height: 1.6;
    margin: 0 0 0.5rem;
}

.hogaku-card__genre {
    display: inline-block;
    font-size: 0.7rem;
    color: var(--towa-text-light);
    background: var(--towa-bg-alt);
    padding: 0.15rem 0.5rem;
    border-radius: var(--towa-radius-sm);
}

/* ---- 空の状態 ---- */
.hogaku-empty {
    text-align: center;
    padding: 3rem 1rem;
}

.hogaku-empty__text {
    color: var(--towa-text-light);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.hogaku-empty__reset {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border: 1.5px solid var(--towa-primary);
    color: var(--towa-primary);
    border-radius: 100px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: background var(--towa-transition), color var(--towa-transition);
}

.hogaku-empty__reset:hover {
    background: var(--towa-primary);
    color: #fff;
}

/* ---- シングル（曲詳細） ---- */
.hogaku-single {
    max-width: 720px;
    margin: 0 auto;
}

.hogaku-single__header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--towa-border);
}

.hogaku-single__title-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.hogaku-single__title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--towa-heading);
    margin: 0;
    line-height: var(--towa-line-height-heading);
}

.hogaku-single__composer {
    font-size: 0.95rem;
    color: var(--towa-text-light);
    margin: 0;
}

/* メタ情報テーブル */
.hogaku-single__meta-table {
    background: var(--towa-bg-alt);
    border-radius: var(--towa-radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.hogaku-single__meta-row {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--towa-border);
}

.hogaku-single__meta-row:last-child {
    border-bottom: none;
}

.hogaku-single__meta-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--towa-text-light);
    min-width: 80px;
    flex-shrink: 0;
}

.hogaku-single__meta-value {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* 一言コメント */
.hogaku-single__comment {
    background: var(--towa-bg-alt);
    border-left: 3px solid var(--towa-primary);
    border-radius: var(--towa-radius-sm);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.hogaku-single__comment p {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--towa-text);
}

/* YouTube埋め込み */
.hogaku-single__youtube {
    margin-bottom: 2rem;
}

.hogaku-single__youtube-wrap {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    border-radius: var(--towa-radius-md);
    background: #000;
}

.hogaku-single__youtube-wrap iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* 本文 */
.hogaku-single__content {
    margin-bottom: 2rem;
}

/* 戻るリンク */
.hogaku-single__back {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--towa-border);
}

.hogaku-single__back-link {
    display: inline-block;
    color: var(--towa-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: opacity var(--towa-transition);
}

.hogaku-single__back-link:hover {
    opacity: 0.7;
}

/* 関連曲 */
.hogaku-related {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--towa-border);
}

/* ---- レスポンシブ ---- */
@media (max-width: 767px) {
    .hogaku-archive-header__title {
        font-size: 1.5rem;
    }

    .hogaku-songs-grid {
        grid-template-columns: 1fr;
    }

    .hogaku-single__title {
        font-size: 1.35rem;
    }

    .hogaku-single__title-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .hogaku-filters__tabs {
        gap: 0.3rem;
    }

    .hogaku-filters__tab {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .hogaku-songs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .hogaku-songs-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .hogaku-songs-grid--related {
        grid-template-columns: repeat(4, 1fr);
    }
}