/* リセットとベース設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-bg: rgba(0, 0, 0, 0.85);
    --secondary-bg: rgba(0, 0, 0, 0.95);
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --accent-color: #00d8ff;
    --sidebar-width: 300px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans JP', 'Roboto', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 固定背景 */
.fixed-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    background-image: url('images/hero-bg.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    z-index: -1;
}

.fixed-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.8) 0%, rgba(22, 33, 62, 0.8) 50%, rgba(15, 52, 96, 0.8) 100%);
}

/* サイドバー */
.main_header {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--secondary-bg);
    overflow-y: auto;
    z-index: 1000;
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
}

.header_content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.logo {
    text-align: center;
    margin-bottom: 50px;
}

.logo h1 {
    font-family: 'PT Sans', sans-serif;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.tagline {
    font-size: 14px;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

/* ナビゲーション */
.main_nav {
    flex: 1;
}

.mobile_menu_toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    position: absolute;
    right: 20px;
    top: 20px;
}

.mobile_menu_toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 5px 0;
    transition: var(--transition);
}

.main_nav ul {
    list-style: none;
}

.main_nav li {
    margin-bottom: 20px;
}

.nav_link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1px;
    transition: var(--transition);
    display: block;
    padding: 5px 0;
}

.nav_link:hover,
.nav_link.active {
    color: var(--accent-color);
}

/* ソーシャルリンク */
.social_links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 40px 0;
}

.social_icon {
    color: var(--text-secondary);
    transition: var(--transition);
}

.social_icon:hover {
    color: var(--accent-color);
}

/* コピーライト */
.copyright {
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
}

/* メインコンテンツ */
.site_wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* ヒーローセクション */
.hero_section {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero_slider {
    width: 100%;
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    background-image: url('images/hero-slide1.png');
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease;
}

.slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: -1;
}

.slide.active {
    opacity: 1;
}

.slide_content {
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
}

.slide_title {
    font-size: clamp(36px, 5vw, 72px);
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 3px;
}

.slide_subtitle {
    font-size: clamp(18px, 2vw, 24px);
    color: var(--text-secondary);
    letter-spacing: 1px;
}

/* コンテンツセクション */
.content_section {
    padding: 100px 0;
    background: var(--primary-bg);
}

.dark_section {
    background: var(--secondary-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.section_title {
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: 3px;
    position: relative;
    display: inline-block;
    width: 100%;
}

.section_title::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--accent-color);
}

/* ニュースセクション */
.news_grid {
    display: grid;
    gap: 40px;
}

.news_item {
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.news_item:last-child {
    border-bottom: none;
}

.news_date {
    font-size: 14px;
    color: var(--accent-color);
    margin-bottom: 10px;
    display: block;
}

.news_title {
    font-size: 24px;
    margin-bottom: 15px;
    line-height: 1.4;
}

.news_excerpt {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ライブセクション */
.live_list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.live_item {
    display: flex;
    align-items: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    transition: var(--transition);
}

.live_item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.live_date {
    text-align: center;
    margin-right: 40px;
    min-width: 80px;
}

.date_month {
    display: block;
    font-size: 14px;
    color: var(--accent-color);
    font-weight: 700;
}

.date_day {
    display: block;
    font-size: 36px;
    font-weight: 700;
    line-height: 1;
}

.live_info {
    flex: 1;
}

.live_title {
    font-size: 24px;
    margin-bottom: 10px;
}

.live_venue {
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.live_details {
    font-size: 14px;
    color: var(--text-secondary);
}

.live_ticket {
    background: var(--accent-color);
    color: #000;
    padding: 10px 30px;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 700;
    transition: var(--transition);
}

.live_ticket:hover {
    background: #00a8cc;
    transform: translateY(-2px);
}

/* メンバーセクション */
.member_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.member_card {
    text-align: center;
}

.member_image {
    margin-bottom: 20px;
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto 20px;
}

.member_image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: 0 4px 20px rgba(0, 216, 255, 0.3);
}

.member_placeholder {
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-color);
}

.member_name {
    font-size: 24px;
    margin-bottom: 5px;
}

.member_role {
    color: var(--accent-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.member_bio {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

/* ディスコグラフィーセクション */
.disco_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.disco_item {
    text-align: center;
}

.disco_cover {
    margin-bottom: 20px;
    position: relative;
    width: 250px;
    height: 250px;
    margin: 0 auto 20px;
}

.disco_cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.disco_item:hover .disco_cover img {
    transform: scale(1.05);
}

.disco_placeholder {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-color);
    border-radius: 10px;
}

.disco_title {
    font-size: 20px;
    margin-bottom: 10px;
}

.disco_info {
    color: var(--text-secondary);
    font-size: 14px;
}

/* メディアセクション */
.media_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.video_wrapper {
    position: relative;
    padding-top: 56.25%;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

.video_placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-secondary);
}

.video_placeholder span {
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 10px;
}

/* 動画サムネイル */
.video_thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 再生ボタン */
.play_button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: none;
    border: none;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.play_button:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.video_wrapper:hover .play_button {
    transform: translate(-50%, -50%) scale(1.1);
}

/* コンタクトセクション */
.contact_content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact_info {
    margin-top: 40px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

.contact_info p {
    margin-bottom: 15px;
}

.contact_info strong {
    color: var(--accent-color);
}

/* カスタムスクロールバー */
.main_header::-webkit-scrollbar {
    width: 8px;
}

.main_header::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

.main_header::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.main_header::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* レスポンシブデザイン */
@media (max-width: 1200px) {
    .container {
        padding: 0 30px;
    }
}

@media (max-width: 960px) {
    .media_grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    /* モバイルヘッダー */
    .main_header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 70px;
        padding: 15px 20px;
        flex-direction: row;
        align-items: center;
        overflow: visible;
    }
    
    .header_content {
        flex-direction: row;
        align-items: center;
        width: 100%;
    }
    
    .logo {
        margin-bottom: 0;
        text-align: left;
        flex: 1;
    }
    
    .logo h1 {
        font-size: 20px;
    }
    
    .tagline {
        display: none;
    }
    
    /* モバイルメニュー */
    .mobile_menu_toggle {
        display: block;
        position: static;
    }
    
    .mobile_menu_toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile_menu_toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile_menu_toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .main_nav {
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--secondary-bg);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .main_nav.active {
        max-height: 500px;
    }
    
    .main_nav ul {
        padding: 20px;
    }
    
    .main_nav li {
        margin-bottom: 15px;
    }
    
    .social_links,
    .copyright {
        display: none;
    }
    
    /* メインコンテンツ調整 */
    .site_wrapper {
        margin-left: 0;
        padding-top: 70px;
    }
    
    /* セクション調整 */
    .content_section {
        padding: 60px 0;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .section_title {
        font-size: 32px;
        margin-bottom: 40px;
    }
    
    /* グリッド調整 */
    .member_grid,
    .disco_grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .live_item {
        flex-direction: column;
        text-align: center;
    }
    
    .live_date {
        margin-right: 0;
        margin-bottom: 20px;
    }
    
    .live_info {
        margin-bottom: 20px;
    }
    
    /* ヒーローセクション調整 */
    .hero_section {
        height: 80vh;
    }
    
    .slide_title {
        font-size: 32px;
    }
    
    .slide_subtitle {
        font-size: 18px;
    }
}