:root {
    --bg-color: #0a0a0a;
    --text-color: #ffffff;
    --accent-color: #d4af37;
    /* Gold */
    --accent-glow: rgba(212, 175, 55, 0.4);
    --secondary-bg: #1a1a1a;
    --border-color: #333;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --font-main: 'Inter', 'Noto Sans JP', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header & KV */
header {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(to bottom, #000, #0a0a0a);
}

.kv-container {
    width: 100%;
    max-width: 1000px;
    margin-top: 20px;
    padding: 0 20px;
    text-align: center;
}

.kv-image {
    width: 100%;
    height: auto;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.8), 0 0 20px var(--accent-glow);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

/* Tabs Navigation */
.tabs-nav {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.tabs-list {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 10px;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.tab-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    letter-spacing: 1px;
}

.tab-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.tab-btn.active {
    background: var(--accent-color);
    color: var(--bg-color);
    border-color: var(--accent-color);
}

.news-toggle-btn {
    text-align: center;
    padding: 30px;
    margin-top: 30px;
    color: var(--accent-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 1px dashed var(--border-color);
    border-radius: 4px;
    display: block;
    width: 100%;
}

.news-toggle-btn:hover {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--accent-color);
    letter-spacing: 2px;
}

/* Content Sections */
.tab-content {
    display: none;
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h2 {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 30px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 4px;
}

/* Artist Grid */
.artist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.artist-card {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    padding: 15px;
    text-align: center;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.artist-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.artist-thumb {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    margin-bottom: 15px;
    filter: grayscale(20%);
}

.artist-name {
    font-size: 0.9rem;
    margin-bottom: 10px;
    height: 3em;
    display: flex;
    align-items: center;
    justify-content: center;
}

.x-link {
    display: inline-block;
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.8rem;
    border: 1px solid var(--accent-color);
    padding: 5px 15px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.x-link:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

/* News List */
.news-list {
    list-style: none;
}

.news-item {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    cursor: pointer;
}

.news-item:hover .news-title {
    color: var(--accent-color);
}

.news-date {
    color: #888;
    font-size: 0.8rem;
}

.news-title {
    font-size: 1.2rem;
    margin-top: 5px;
    transition: color 0.3s ease;
}

.news-detail {
    display: none;
    margin-top: 15px;
    color: #ccc;
    border-left: 2px solid var(--accent-color);
    padding-left: 15px;
    line-height: 1.6;
    word-break: break-all;
}

.news-detail a {
    color: #00ccff;
    /* 視認性の高い水色 */
    text-decoration: none;
    transition: color 0.2s;
}

.news-detail a:hover {
    color: #80dfff;
    text-decoration: underline;
}

/* Guidelines */
.about-container {
    background: var(--glass-bg);
    padding: 60px 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    max-width: 900px;
    margin: 0 auto;
    text-align: left;
}

.about-lead {
    font-size: 1.4rem;
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    letter-spacing: 2px;
}

.about-container p {
    margin-bottom: 25px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-point {
    margin: 50px 0;
    padding-left: 20px;
    border-left: 3px solid var(--accent-color);
}

.about-point h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--accent-color);
}

.about-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
    margin-top: 50px !important;
    text-align: center;
    font-style: italic;
    color: var(--accent-color);
}

.signature-container {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    padding-right: 20px;
}

.signature-text {
    font-size: 0.9rem;
    line-height: 1.8;
    color: #ccc;
    margin-bottom: 10px;
}

.owner-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 2px;
}

.signature-image {
    width: 250px;
    height: auto;
    filter: brightness(1.2) contrast(1.1);
    opacity: 0.95;
    margin-top: -15px;
    /* テキストに近づける（画像準拠） */
    margin-right: -25px;
    /* 右端を揃えるための微調整（画像準拠） */
}

.timetable-container {
    text-align: center;
    margin-top: 20px;
}

.timetable-image {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--accent-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.guideline-container {
    background: var(--glass-bg);
    padding: 40px;
    border: 1px solid var(--border-color);
    white-space: pre-wrap;
    font-size: 0.95rem;
    color: #ccc;
    line-height: 1.8;
}

.goods-container {
    max-width: 600px;
    margin: 0 auto;
}

.goods-card {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    text-align: center;
    border-radius: 8px;
}

.goods-card h3 {
    margin-bottom: 20px;
    color: var(--accent-color);
    font-size: 1.4rem;
}

.btn-large {
    padding: 15px 40px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 30px;
    display: inline-block;
}

/* Footer */
.site-footer {
    padding: 80px 20px 40px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 100px;
    background: linear-gradient(to top, #000, #0a0a0a);
}

.footer-links {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    gap: 30px;
}

.footer-link {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: bold;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--text-color);
    text-decoration: underline;
}

.footer-message {
    font-size: 0.9rem;
    color: #ccc;
    margin-bottom: 30px;
}

.footer-copyright {
    font-size: 0.8rem;
    color: #666;
}

/* Responsiveness */
@media (max-width: 768px) {
    .signature-image {
        width: 180px;
    }

    .kv-container {
        margin-top: 10px;
        padding: 0 10px;
    }

    .tabs-nav {
        padding: 10px 0;
    }

    .tabs-list {
        gap: 5px;
        padding: 0 10px;
    }

    .tab-btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }

    .tab-content {
        padding: 20px 15px;
    }

    .tab-content h2 {
        font-size: 1.5rem;
        margin-bottom: 20px;
    }

    .guideline-container {
        padding: 20px;
        font-size: 0.9rem;
    }

    .artist-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .site-footer {
        padding: 30px 15px;
    }

    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
}