/* Music page (/music/) — styles.css の上に重ねる */

.music-page .section {
    padding-top: 120px;
}

.music-page .section + .section {
    padding-top: 40px;
}

.music-page .nav-logo-text {
    text-decoration: none;
}

/* スマホではナビが出ないので戻るリンク */
.music-back {
    display: none;
    position: absolute;
    top: calc(1rem + env(safe-area-inset-top, 0px));
    left: 1.25rem;
    color: #a0aec0;
    font-size: 0.9rem;
    text-decoration: none;
    z-index: 10;
}

.music-back:hover {
    color: #64ffda;
}

/* Release */
.release {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 3.5rem;
    align-items: center;
    max-width: 960px;
    margin: 0 auto 3.5rem;
}

.release-art img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45), 0 0 32px rgba(59, 130, 246, 0.12);
}

.release-type {
    color: #64ffda;
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.release-title {
    font-size: clamp(2rem, 4.5vw, 2.8rem);
    font-weight: 400;
    color: #e0e6ed;
    letter-spacing: 2px;
    line-height: 1.3;
}

.release-artist {
    color: #a0aec0;
    margin-top: 0.4rem;
    letter-spacing: 0.5px;
}

.release-catch {
    color: #e0e6ed;
    margin-top: 1.5rem;
    letter-spacing: 1px;
}

.release-meta {
    margin-top: 1.5rem;
    display: grid;
    gap: 0.4rem;
    font-size: 0.9rem;
}

.release-meta div {
    display: flex;
    gap: 1rem;
}

.release-meta dt {
    color: #64ffda;
    min-width: 3em;
}

.release-meta dd {
    color: #a0aec0;
}

.release-links {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* MV */
.mv {
    max-width: 960px;
    margin: 0 auto 3.5rem;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: #000;
}

.mv iframe,
.mv-facade {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
}

.mv-facade {
    position: relative;
    cursor: pointer;
    padding: 0;
    background: #000;
}

.mv-facade img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.3s ease;
}

.mv-facade:hover img,
.mv-facade:focus-visible img {
    opacity: 0.8;
}

.mv-play {
    position: absolute;
    left: 1.25rem;
    bottom: 1.25rem;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1.2rem 0.6rem 1rem;
    border-radius: 30px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(100, 255, 218, 0.7);
    color: #64ffda;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: all 0.3s ease;
}

.mv-facade:hover .mv-play,
.mv-facade:focus-visible .mv-play {
    background: rgba(100, 255, 218, 0.18);
    color: #ffffff;
}

/* Credits / Lyrics */
.release-details {
    max-width: 960px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.credits,
.lyrics,
.offvocal-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 1.75rem;
}

.credits h3,
.lyrics summary {
    font-size: 1.1rem;
    font-weight: 400;
    color: #e0e6ed;
    letter-spacing: 0.5px;
}

.credits dl {
    margin-top: 1rem;
    display: grid;
    gap: 0.5rem;
    font-size: 0.92rem;
}

.credits dl div {
    display: grid;
    grid-template-columns: 9em 1fr;
    gap: 1rem;
}

.credits dt {
    color: #64ffda;
}

.credits dd {
    color: #e0e6ed;
}

.lyrics summary {
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lyrics summary::-webkit-details-marker {
    display: none;
}

.lyrics summary::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.8rem;
    color: #64ffda;
    transition: transform 0.3s ease;
}

.lyrics[open] summary::after {
    transform: rotate(180deg);
}

.lyrics-body {
    margin-top: 1.25rem;
    color: #e0e6ed;
    font-size: 0.95rem;
    line-height: 2;
    letter-spacing: 0.5px;
}

.lyrics-body p + p {
    margin-top: 1.5rem;
}

/* Off Vocal */
.offvocal-card {
    max-width: 760px;
    margin: 0 auto;
    padding: 2.25rem;
}

.offvocal-title {
    font-size: 1.3rem;
    font-weight: 400;
    color: #e0e6ed;
    letter-spacing: 0.5px;
}

.offvocal-spec {
    margin-top: 0.5rem;
    color: #a0aec0;
    font-size: 0.88rem;
}

.offvocal-terms {
    margin-top: 1.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.offvocal-terms h4 {
    font-size: 1rem;
    font-weight: 400;
    color: #64ffda;
    margin-bottom: 0.6rem;
}

.offvocal-terms p,
.offvocal-terms li {
    color: #e0e6ed;
    font-size: 0.92rem;
    line-height: 1.8;
}

.offvocal-terms ul {
    margin-top: 0.6rem;
    padding-left: 1.2rem;
    display: grid;
    gap: 0.4rem;
}

.offvocal-terms li::marker {
    color: #64ffda;
}

.offvocal-terms a {
    color: #64ffda;
}

.offvocal-terms .offvocal-title {
    position: relative;
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 1px;
    padding-bottom: 0.9rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.offvocal-terms .offvocal-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 56px;
    height: 2px;
    background: linear-gradient(90deg, #64ffda, #3b82f6);
    border-radius: 2px;
}

.offvocal-terms h5 {
    margin-top: 1.9rem;
    padding-left: 0.75rem;
    border-left: 3px solid #64ffda;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.4;
    color: #e0e6ed;
    letter-spacing: 0.5px;
}

.offvocal-terms ul {
    margin-top: 0.7rem;
}

.offvocal-example {
    color: #a0aec0;
    overflow-wrap: anywhere;
}

.offvocal-note {
    margin-top: 1.5rem;
    color: #a0aec0 !important;
    font-size: 0.8rem !important;
}

.offvocal-files {
    list-style: none;
    margin-top: 2rem;
    display: grid;
    gap: 0.75rem;
}

.offvocal-file {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.offvocal-name {
    color: #e0e6ed;
}

.offvocal-size {
    margin-top: 0.15rem;
    color: #a0aec0;
    font-size: 0.82rem;
}

.offvocal-file .btn {
    flex-shrink: 0;
    font-size: 0.85rem;
    padding: 0.6rem 1.4rem;
}

.offvocal-file .btn[aria-disabled="true"] {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* 目次（.song から自動で作る） */
.song-index {
    max-width: 960px;
    margin: 0 auto 4rem;
}

.song-index-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 0.75rem;
}

.song-index-item {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 0.6rem 0.8rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    text-decoration: none;
    transition: all 0.3s ease;
}

.song-index-item:hover {
    border-color: rgba(100, 255, 218, 0.45);
    transform: translateY(-2px);
}

.song-index-item img {
    width: 56px;
    height: 56px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
}

.song-index-text {
    display: grid;
    gap: 0.1rem;
}

.song-index-title {
    color: #e0e6ed;
    letter-spacing: 0.5px;
}

.song-index-date {
    color: #a0aec0;
    font-size: 0.8rem;
}

/* 曲ごとのまとまり */
.song,
.offvocal-card[id],
#offvocal-terms {
    scroll-margin-top: 90px;
}

.song + .song {
    margin-top: 5rem;
    padding-top: 5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.song .offvocal-card {
    margin-top: 2rem;
}

.offvocal-lead {
    margin-top: 1rem;
    color: #e0e6ed;
    font-size: 0.92rem;
    line-height: 1.8;
}

.offvocal-lead a {
    color: #64ffda;
}

.offvocal-card > .offvocal-terms:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
}

.song .offvocal-files {
    margin-top: 1.25rem;
}

/* Responsive */
@media (max-width: 768px) {
    .music-back {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
    }

    .music-page .section {
        padding-top: 72px;
    }

    .release {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
        margin-bottom: 2.5rem;
    }

    .release-art {
        max-width: 320px;
        margin: 0 auto;
    }

    .release-meta {
        display: inline-grid;
        text-align: left;
    }

    .mv-play {
        left: 0.6rem;
        bottom: 0.6rem;
        padding: 0.35rem 0.8rem 0.35rem 0.7rem;
        font-size: 0.78rem;
        gap: 0.4rem;
    }

    .release-links {
        justify-content: center;
    }

    .mv {
        margin-bottom: 2.5rem;
    }

    .release-details {
        grid-template-columns: 1fr;
    }

    .song-index {
        margin-bottom: 2.5rem;
    }

    .song + .song {
        margin-top: 3rem;
        padding-top: 3rem;
    }

    .credits dl div {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .credits,
    .lyrics,
    .offvocal-card {
        padding: 1.4rem;
    }

    .offvocal-file {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .offvocal-file .btn {
        justify-content: center;
    }
}

/* styles.css の .btn-primary::before（z-index: -1）がカードの背景の後ろに回らないように */
.music-page .btn {
    isolation: isolate;
}