:root {
    --color-base: #0A0A0A; --color-text: #E0E0E0; --color-heading: #FFFFFF;
    --color-border: rgba(255, 255, 255, 0.2); --color-border-hover: rgba(255, 255, 255, 0.8);
    --font-jp: 'Noto Sans JP', sans-serif; --font-en: 'Cinzel', serif;
    --content-width: 1100px; --header-height: 90px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background-color: var(--color-base); color: var(--color-text); font-family: var(--font-jp); line-height: 1.8; }
body::before {
    content: ''; position: fixed; inset: 0; z-index: -1; opacity: 0.05;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}
#background-animation { position: fixed; inset: 0; z-index: -1; opacity: 0; transition: opacity 1.5s ease-in-out; }
body.is-scrolled-past-hero #background-animation { opacity: 1; }
#page-container { background-color: transparent; position: relative; z-index: 2; }
.loader {
    position: fixed; inset: 0; background-color: var(--color-base);
    z-index: 10000; display: flex; flex-direction: column;
    justify-content: center; align-items: center; gap: 1.5rem;
}
.loader__text { font-family: var(--font-en); font-size: 1rem; letter-spacing: 0.1em; color: var(--color-text); opacity: 0; }
.loader__spinner { width: 150px; height: 2px; background-color: var(--color-border); position: relative; overflow: hidden; }
.loader__spinner::after { content: ''; position: absolute; left: -100%; width: 50%; height: 100%; background-color: var(--color-heading); animation: loading-bar 2s ease-in-out infinite; }
@keyframes loading-bar { 0% { left: -50%; width: 50%; } 50% { left: 50%; width: 50%;} 100% { left: 100%; width: 50%;} }
.header { position: fixed; width: 100%; top: 0; height: var(--header-height); z-index: 1000; transition: background-color 0.4s ease, backdrop-filter 0.4s ease; }
.header.is-scrolled { background-color: rgba(10, 10, 10, 0.7); backdrop-filter: blur(10px); }
.header__inner { max-width: 1400px; margin: 0 auto; padding: 0 2rem; height: 100%; display: flex; justify-content: space-between; align-items: center; }
.header__logo a { display: block; height: 40px; }
.header__logo img { height: 100%; width: auto; opacity: 0.9; transition: opacity 0.3s; }
.header__logo a:hover img { opacity: 1; }
.header__nav { display: flex; gap: 2.5rem; }
.header__nav a { font-family: var(--font-en); color: var(--color-text); text-decoration: none; transition: color 0.3s; font-weight: 500; letter-spacing: 0.05em; }
.header__nav a:hover { color: var(--color-heading); }
.content-section { max-width: var(--content-width); margin: 0 auto; padding: 8rem 2rem; }
.section-title { font-family: var(--font-en); font-size: 2rem; text-align: center; color: var(--color-heading); margin-bottom: 4rem; font-weight: 500; letter-spacing: 0.1em; }
.hero-section { height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; perspective: 1000px; }
.hero-section__logo-container { width: 250px; height: 250px; animation: float 6s ease-in-out infinite; will-change: transform; transition: transform 0.2s ease-out; }
.hero-section__logo { width: 100%; }
@keyframes float { 0% { transform: translateY(0px); } 50% { transform: translateY(-20px); } 100% { transform: translateY(0px); } }
.hero-section__content { margin-top: 2.5rem; }
.hero-section__artist-name { font-family: var(--font-jp); font-size: 1.8rem; color: var(--color-heading); font-weight: 500; }
.hero-section__sub-text { font-family: var(--font-en); font-size: 1rem; letter-spacing: 0.2em; color: var(--color-text); }
.scroll-down-indicator { position: absolute; bottom: 40px; width: 24px; height: 40px; border: 2px solid var(--color-text); border-radius: 12px; }
.scroll-down-indicator__wheel { width: 4px; height: 8px; background: var(--color-text); border-radius: 2px; margin: 6px auto 0; animation: scroll 2s ease-in-out infinite; }
@keyframes scroll { 0% { transform: translateY(0); opacity: 1; } 50% { transform: translateY(10px); opacity: 1; } 100% { transform: translateY(20px); opacity: 0; } }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.card { position: relative; display: block; text-decoration: none; color: var(--color-text); border-radius: 16px; overflow: hidden; transition: transform 0.3s, border-color 0.3s; border: 1px solid var(--color-border); }
.card:not(.is-disabled):hover { transform: translateY(-5px); border-color: var(--color-border-hover); }
.card.is-disabled { cursor: default; }
.card.is-disabled:hover { transform: none; border-color: var(--color-border); }
.card__image-wrapper { position: relative; aspect-ratio: 1 / 1; overflow: hidden; }
.card__image { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.card:not(.is-disabled):hover .card__image { transform: scale(1.05); }
.card__image-placeholder { width: 100%; height: 100%; background-color: #181818; }
.card__genre { position: absolute; top: 1rem; right: 1rem; background-color: rgba(0, 0, 0, 0.7); backdrop-filter: blur(5px); color: var(--color-heading); font-family: var(--font-en); font-size: 0.8rem; padding: 0.25rem 0.75rem; border-radius: 999px; letter-spacing: 0.05em; z-index: 3; }
.card__body { padding: 1.5rem; background-color: #111; }
.card__title { font-family: var(--font-en); font-size: 1.2rem; color: var(--color-heading); margin-bottom: 0.5rem; text-align: center; }
.card__overlay { position: absolute; inset: 0; background-color: rgba(0,0,0,0.6); color: var(--color-heading); font-family: var(--font-en); font-size: 1.5rem; display: grid; place-items: center; z-index: 2; }
.profile-card { display: grid; grid-template-columns: 200px 1fr; gap: 3rem; align-items: center; background-color: #111; border: 1px solid var(--color-border); border-radius: 16px; padding: 3rem; max-width: 900px; margin: 0 auto; }
.profile-card__image-container { max-width: 200px; margin: 0 auto; }
.profile-card__image { width: 100%; border-radius: 8px; }
.profile-card__text h3 { font-size: 1.8rem; color: var(--color-heading); margin-bottom: 1rem; }
.lore-content { text-align: center; max-width: 700px; margin: 0 auto; }
.lore-content p { margin-bottom: 1rem; }
.news-list { list-style: none; max-width: 800px; margin: 0 auto; }
.news-list li { display: flex; gap: 2rem; padding: 1rem 0; border-bottom: 1px solid var(--color-border); }
.news-list time { font-family: var(--font-en); color: var(--color-heading); min-width: 100px; }
.footer { padding: 3rem 2rem; text-align: center; font-size: 0.9rem; color: rgba(255, 255, 255, 0.4); }
.section-title, .card, .profile-card, .lore-content, .news-list li { opacity: 0; transform: translateY(30px); }
.series-header { padding-top: var(--header-height); text-align: center; padding-bottom: 4rem; }
.series-header__image-wrapper { max-width: 300px; margin: 0 auto 3rem; }
.series-header__image { width: 100%; border-radius: 16px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.series-title { font-size: 3rem; margin-bottom: 1rem; }
.series-description { font-size: 1rem; color: var(--color-text); max-width: 600px; margin: 0 auto; padding: 0 2rem; }
.back-to-top-container { text-align: center; margin-top: 5rem; }
.button { display: inline-block; padding: 1rem 1.5rem; background: transparent; border: 1px solid var(--color-border); border-radius: 8px; color: var(--color-text); font-family: var(--font-en); font-size: 1rem; letter-spacing: 0.1em; cursor: pointer; transition: background-color 0.3s, color 0.3s; text-decoration: none; text-align: center; }
.button:hover { background-color: var(--color-heading); color: var(--color-base); }
.work-detail-page #page-container { padding-top: var(--header-height); }
.work-detail-page .header__inner { justify-content: flex-start; }
.blurred-bg { position: fixed; inset: 0; z-index: -1; background-size: cover; background-position: center; filter: blur(20px) brightness(0.4); transform: scale(1.1); }
.back-to-home-button { font-family: var(--font-en); color: var(--color-text); text-decoration: none; transition: color 0.3s; }
.back-to-home-button:hover { color: var(--color-heading); }
.work-detail-main { padding: 4rem 2rem; }
.work-detail-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 400px 1fr; gap: 4rem; }
.work-detail-container.single-column .work-detail__left { display: none; }
.work-detail-container.single-column .work-detail__right { padding-left: 0; max-width: 800px; margin: 0 auto; }
.work-detail__left { position: sticky; top: calc(var(--header-height) + 4rem); height: calc(100vh - var(--header-height) - 8rem); }
.artwork-player-container { display: flex; flex-direction: column; gap: 2rem; }
.artwork-image { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 16px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); transition: opacity 0.4s ease-in-out; }
.work-detail__right { padding-left: 2rem; }
.work-title { font-family: var(--font-en); font-size: 3rem; color: var(--color-heading); line-height: 1.2; margin-bottom: 0.5rem; }
.work-artist { font-family: var(--font-jp); font-size: 1.2rem; color: var(--color-text); font-weight: 400; margin-bottom: 4rem; }
.work-content-section { margin-bottom: 3rem; }
.work-content-section h3 { font-family: var(--font-en); font-size: 1.5rem; color: var(--color-heading); margin-bottom: 1.5rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.5rem; }
.tracklist__item { border-bottom: 1px solid var(--color-border); }
.tracklist__item[open] > summary { background-color: rgba(255,255,255,0.1); }
.tracklist__item summary { display: flex; align-items: center; gap: 1.5rem; padding: 1rem; cursor: pointer; list-style: none; transition: background-color 0.3s; }
.tracklist__item summary::-webkit-details-marker, .tracklist__item summary::marker { display: none; }
.tracklist__item summary:hover { background-color: rgba(255,255,255,0.05); }
.tracklist__toggle-icon { width: 20px; height: 20px; border: 1px solid var(--color-text); border-radius: 50%; position: relative; transition: transform 0.4s ease; flex-shrink: 0; }
.tracklist__item[open] .tracklist__toggle-icon { transform: rotate(135deg); }
.tracklist__toggle-icon::before, .tracklist__toggle-icon::after { content: ''; position: absolute; top: 50%; left: 50%; width: 10px; height: 1px; background-color: var(--color-text); transform: translate(-50%, -50%); }
.tracklist__toggle-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.tracklist__track-number { font-family: var(--font-en); font-size: 0.9rem; color: var(--color-text); }
.tracklist__track-title { flex-grow: 1; color: var(--color-heading); font-weight: 500; }
.tracklist__item-content-wrapper { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.4s ease-out; }
.tracklist__item[open] > .tracklist__item-content-wrapper { grid-template-rows: 1fr; }
.tracklist__item-detail { overflow: hidden; background-color: rgba(0,0,0,0.2); }
.tracklist__item-detail-inner { padding: 1.5rem 2rem 2rem 3.8rem; }
.tracklist__item-detail h4 { font-family: var(--font-en); color: var(--color-heading); margin-bottom: 1rem; font-weight: 400; }
.tracklist__item-detail pre { padding: 1rem; background: rgba(0,0,0,0.1); border-left: 2px solid var(--color-border); font-size: 0.9rem; line-height: 1.8; color: var(--color-text); white-space: pre-wrap; font-family: var(--font-jp); margin-bottom: 1rem; }
.tracklist__item-detail .interpretation { padding-left: 1rem; border-left: 2px solid var(--color-border); margin: 1.5rem 0; font-style: italic; opacity: 0.9; }
.tracklist__item-detail .commentary { margin-top: 1.5rem; }
@media (max-width: 992px) {
    .work-detail-container { grid-template-columns: 1fr; }
    .work-detail__left { position: static; height: auto; }
    .work-detail__right { padding-left: 0; }
}
/* Music Links Section
-------------------------------------------------- */
/* Music Links Section
-------------------------------------------------- */
.music-links-section {
    padding: 6rem 2rem;
    max-width: var(--content-width);
    margin: 0 auto;
    opacity: 0;
    transform: translateY(30px);
}
.music-links-header {
    text-align: center; /* タイトルとサブタイトルを中央揃え */
    margin-bottom: 3rem;
}
.music-links-title {
    font-family: var(--font-en);
    font-size: 2rem;
    color: var(--color-heading);
    letter-spacing: 0.1em;
    font-weight: 500;
}
.music-links-subtitle {
    margin-top: 0.5rem;
    color: var(--color-text);
}
.music-links-container {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 999px; /* 横長の丸いコンテナ */
    padding: 0.75rem 1rem;
    max-width: 500px;
    margin: 0 auto;
}
.music-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
}
.music-link {
    position: relative;
    display: flex;
}
.music-link__icon-wrapper {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.music-link__icon {
    width: 32px;
    height: 32px;
    filter: grayscale(1); /* 最初はグレースケール */
    opacity: 0.7;
    transition: all 0.3s ease;
}
.music-link:hover .music-link__icon {
    filter: grayscale(0); /* ホバーでフルカラーに */
    opacity: 1;
    transform: scale(1.1);
}
.music-link__tooltip {
    position: absolute;
    bottom: 100%;
    margin-bottom: 0.75rem;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-heading);
    color: var(--color-base);
    font-size: 0.8rem;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    font-family: var(--font-jp);
    font-weight: 500;
}
.music-link:hover .music-link__tooltip {
    opacity: 1;
}
.music-links-more {
    text-align: center; /* 「...and more」ボタンを中央揃え */
    margin-top: 2rem;
}

/* Responsive adjustments
-------------------------------------------------- */
@media (max-width: 768px) {
    /* Profile Card for Mobile */
    .profile-card {
        /* 2列グリッドを1列に変更 */
        grid-template-columns: 1fr;
        /* 要素間の余白を調整 */
        gap: 2rem;
        /* カード内の余白を調整 */
        padding: 2rem;
        /* テキストを中央揃えに */
        text-align: center;
    }
}