/*
 * AI Rin ポートフォリオサイト CSS デザインシステム
 * ディープスペース・ネオンとグラスモルフィズムを取り入れた、プレミアムでリッチなデザイン。
 */

:root {
    /* デフォルトカラー設定（データベースから動的にオーバーライド可能） */
    --primary-color: #00f2fe;
    --secondary-color: #4facfe;
    --accent-color: #f35588;
    --bg-dark: #0b0f19;
    --text-light: #ffffff;
    --text-dim: #8b9bb4;
    
    /* 共通ユーティリティ変数 */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-bg-hover: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-focus: rgba(0, 242, 254, 0.3);
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --shadow-neon: 0 0 20px rgba(0, 242, 254, 0.2);
}

/* 全体リセット & スムーススクロール */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', 'Noto Sans JP', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
    font-size: 16px;
}

/* ユーティリティクラス */
.hidden {
    display: none !important;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- 星空のバックグラウンドアニメーション --- */
body::before, body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    pointer-events: none;
    background-image: 
        radial-gradient(1px 1px at 25px 35px, #fff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 60px 120px, #fff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 120px 80px, #fff, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 180px 240px, #fff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 280px 140px, #fff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 320px 40px, #fff, rgba(0,0,0,0));
    background-size: 350px 350px;
    animation: starryTwinkle 12s infinite linear;
    opacity: 0.35;
}

body::after {
    background-size: 450px 450px;
    animation: starryTwinkle 18s infinite linear reverse;
    opacity: 0.2;
}

@keyframes starryTwinkle {
    0% { opacity: 0.35; transform: translateY(0); }
    50% { opacity: 0.15; }
    100% { opacity: 0.35; transform: translateY(-20px); }
}

/* スクロールバーのカスタマイズ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* --- ヘッダー & ナビゲーション --- */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 24px 0;
    transition: var(--transition-smooth);
}

header.scrolled {
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    padding: 16px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 30px rgba(0, 242, 254, 0.3);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 1px;
    opacity: 0.75;
    transition: var(--transition-smooth);
    position: relative;
    padding: 6px 0;
}

.nav-link:hover {
    opacity: 1;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.menu-toggle-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-light);
    background: none;
    border: none;
    cursor: pointer;
}

/* --- ヒーローセクション --- */
#hero {
    height: 90vh;
    min-height: 600px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(11, 15, 25, 0.4) 0%, var(--bg-dark) 85%);
    z-index: 2;
}

.hero-bg-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-bg-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
    transform: scale(1.05);
    animation: slowZoom 30s infinite alternate;
}

@keyframes slowZoom {
    0% { transform: scale(1.02); }
    100% { transform: scale(1.08); }
}

.hero-inner {
    position: relative;
    z-index: 5;
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 900;
    letter-spacing: 4px;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 30%, var(--text-dim) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.5));
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 40px rgba(0, 242, 254, 0.4);
}

.hero-btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--bg-dark);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50px;
    box-shadow: var(--shadow-neon);
    transition: var(--transition-smooth);
    border: none;
    cursor: pointer;
    letter-spacing: 1px;
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.5);
    background: linear-gradient(135deg, #ffffff, var(--primary-color));
}

/* スクロールダウンインジケータ */
.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0.6;
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--text-dim);
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--primary-color), transparent);
    animation: scrollAnim 2s infinite;
}

@keyframes scrollAnim {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* --- セクション共通 --- */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: 2px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* --- ABOUT セクション --- */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    padding: 40px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.about-text {
    color: var(--text-dim);
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 16px;
}

.about-text h3 {
    color: var(--text-light);
    margin: 24px 0 12px;
    font-weight: 700;
}

.about-visual {
    position: relative;
    display: flex;
    justify-content: center;
}

.about-image-wrapper {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    aspect-ratio: 4/5;
    width: 100%;
    max-width: 380px;
}

.about-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-image-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(11, 15, 25, 0.8) 0%, transparent 60%);
    pointer-events: none;
}

.about-visual::before {
    content: '';
    position: absolute;
    top: -20px;
    right: 20px;
    width: 100%;
    height: 100%;
    border: 2px solid rgba(0, 242, 254, 0.2);
    border-radius: 24px;
    z-index: -1;
    max-width: 380px;
    transform: translate(20px, 20px);
    pointer-events: none;
}

/* --- ACCOUNTS セクション (SNSなど) --- */
.accounts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.account-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 24px;
    display: flex;
    gap: 20px;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    transition: var(--transition-smooth);
}

.account-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-neon);
    background: var(--glass-bg-hover);
}

.account-icon-box {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--primary-color);
    border: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
}

.account-card:hover .account-icon-box {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-dark);
    transform: rotate(6deg);
}

.account-image-box {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.account-image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.account-info {
    flex: 1;
}

.account-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.account-desc {
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.4;
}

/* --- PORTFOLIO (作品集) セクション --- */

/* ポートフォリオ・タブ */
.portfolio-tabs-container {
    display: flex;
    justify-content: center;
    margin-bottom: 48px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.portfolio-tabs {
    display: flex;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 6px;
    border-radius: 50px;
    backdrop-filter: blur(12px);
    gap: 4px;
}

.tab-btn {
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    border-radius: 50px;
    transition: var(--transition-smooth);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-light);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-dark);
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
}

/* ホームページ用カテゴリ別クイックショートカット */
.category-shortcuts {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.category-shortcut-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-light);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(12px);
    transition: var(--transition-smooth);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.category-shortcut-btn:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-neon);
    color: var(--primary-color);
    background: var(--glass-bg-hover);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
}

/* コンテンツグリッド */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.portfolio-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    height: 100%;
    cursor: pointer;
    position: relative;
}

.portfolio-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-neon);
}

/* カードのカバー画像 */
.card-cover {
    width: 100%;
    aspect-ratio: 16/10;
    position: relative;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.02);
}

.card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.portfolio-card:hover .card-cover img {
    transform: scale(1.05);
}

.card-tag-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: rgba(11, 15, 25, 0.7);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--primary-color);
}

.card-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-light);
}

.card-songs-subtitle {
    font-size: 0.85rem;
    color: var(--accent-color);
    margin-bottom: 12px;
    font-weight: 600;
}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.card-link-arrow {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: var(--transition-smooth);
}

.portfolio-card:hover .card-link-arrow {
    background: var(--primary-color);
    color: var(--bg-dark);
    border-color: var(--primary-color);
    transform: translateX(4px);
}

/* --- 詳細ビューモーダル (リッチモーダル) --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 7, 13, 0.85);
    backdrop-filter: blur(16px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    background: rgba(15, 22, 36, 0.95);
    border: 1px solid var(--glass-border);
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    border-radius: 28px;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5), 0 0 60px rgba(0, 242, 254, 0.05);
    transform: translateY(30px) scale(0.96);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-container {
    transform: translateY(0) scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 10;
    transition: var(--transition-smooth);
}

.modal-close-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: rotate(90deg);
}

.modal-header-hero {
    width: 100%;
    height: 280px;
    position: relative;
    overflow: hidden;
}

.modal-header-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.modal-header-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(15, 22, 36, 1) 0%, rgba(15, 22, 36, 0.4) 60%, transparent 100%);
}

.modal-content-inner {
    padding: 40px;
}

.modal-tag-badge {
    display: inline-block;
    background: rgba(243, 85, 136, 0.1);
    color: var(--accent-color);
    border: 1px solid rgba(243, 85, 136, 0.2);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.modal-title {
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 24px;
    letter-spacing: 1px;
    line-height: 1.2;
}

/* モーダル内部のSONGS表示レイアウト */
.song-credits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 32px;
}

.credit-item {
    font-size: 0.85rem;
}

.credit-label {
    color: var(--text-dim);
    font-weight: 600;
    margin-bottom: 2px;
}

.credit-value {
    font-weight: 700;
    color: var(--text-light);
}

.song-lyrics-container {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 32px;
}

.song-lyrics-title {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 2px;
    margin-bottom: 20px;
    color: var(--primary-color);
    text-align: center;
}

.song-lyrics {
    text-align: center;
    white-space: pre-wrap;
    line-height: 2.2;
    color: var(--text-light);
    font-size: 0.95rem;
}

.song-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.song-link-btn {
    flex: 1;
    min-width: 200px;
    padding: 12px 24px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.85rem;
    letter-spacing: 1px;
    transition: var(--transition-smooth);
}

.song-link-btn.audio {
    background: rgba(0, 242, 254, 0.15);
    border: 1px solid rgba(0, 242, 254, 0.3);
    color: var(--primary-color);
}

.song-link-btn.audio:hover {
    background: var(--primary-color);
    color: var(--bg-dark);
}

.song-link-btn.video {
    background: rgba(243, 85, 136, 0.15);
    border: 1px solid rgba(243, 85, 136, 0.3);
    color: var(--accent-color);
}

.song-link-btn.video:hover {
    background: var(--accent-color);
    color: white;
}

/* イラスト・漫画・その他の詳細説明 */
.modal-description {
    line-height: 1.8;
    color: var(--text-dim);
    font-size: 0.95rem;
}

.modal-description p {
    margin-bottom: 16px;
}

.modal-description h1, .modal-description h2, .modal-description h3 {
    color: var(--text-light);
    margin: 28px 0 16px;
}

/* --- 漫画のテーブル式（グリッド）複数ページ画像表示 --- */
.manga-gallery {
    margin-top: 32px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 24px;
}

.manga-gallery-title {
    font-size: 1rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.manga-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.manga-page-card {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    aspect-ratio: 3/4;
    cursor: zoom-in;
    transition: var(--transition-smooth);
    background: black;
}

.manga-page-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.manga-page-card:hover {
    border-color: var(--primary-color);
    transform: scale(1.03);
}

.manga-page-card:hover img {
    opacity: 0.85;
}

/* フルスクリーン画像ビューアモーダル */
.viewer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.viewer-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.viewer-img-container {
    max-width: 90%;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.viewer-img-container img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.viewer-close-btn {
    position: absolute;
    top: 24px;
    right: 24px;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.viewer-close-btn:hover {
    opacity: 1;
}

/* --- フッター --- */
footer {
    background: rgba(5, 7, 13, 0.95);
    border-top: 1px solid var(--glass-border);
    padding: 40px 0;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
}

footer p {
    margin-bottom: 8px;
}

footer .admin-link {
    display: inline-block;
    margin-top: 12px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-smooth);
}

footer .admin-link:hover {
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
}

/* --- 管理画面デザイン (サイバーパンク・コントロールパネル) --- */
.admin-body {
    background-color: #080b13;
}

.admin-header {
    background: rgba(15, 22, 36, 0.9);
    border-bottom: 1px solid var(--glass-border);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.admin-header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-title-panel {
    display: flex;
    align-items: center;
    gap: 12px;
}

.admin-badge {
    background: rgba(0, 242, 254, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(0, 242, 254, 0.3);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.admin-logout-btn {
    padding: 8px 16px;
    border-radius: 8px;
    background: rgba(243, 85, 136, 0.1);
    border: 1px solid rgba(243, 85, 136, 0.2);
    color: var(--accent-color);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.admin-logout-btn:hover {
    background: var(--accent-color);
    color: white;
}

.admin-main-container {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 40px;
    padding: 40px 0;
}

/* 左ナビゲーション */
.admin-sidebar-nav {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 20px;
    height: fit-content;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.admin-sidebar-btn {
    text-align: left;
    background: none;
    border: none;
    color: var(--text-dim);
    padding: 12px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 12px;
}

.admin-sidebar-btn:hover {
    color: var(--text-light);
    background: rgba(255, 255, 255, 0.02);
}

.admin-sidebar-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-dark);
}

/* 管理画面コンテンツカード */
.admin-content-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    min-height: 600px;
}

.admin-section-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 32px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-form-group {
    margin-bottom: 24px;
}

.admin-form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-dim);
    margin-bottom: 8px;
}

.admin-input-text, .admin-textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-light);
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.admin-input-text:focus, .admin-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.15);
}

.admin-textarea {
    resize: vertical;
    min-height: 120px;
}

.admin-btn {
    padding: 12px 28px;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    border: none;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.admin-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-dark);
}

.admin-btn.primary:hover {
    box-shadow: var(--shadow-neon);
}

.admin-btn.danger {
    background: rgba(243, 85, 136, 0.1);
    border: 1px solid rgba(243, 85, 136, 0.2);
    color: var(--accent-color);
}

.admin-btn.danger:hover {
    background: var(--accent-color);
    color: white;
}

/* 管理画面アイテムリスト表示用 */
.admin-items-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.admin-item-row {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.admin-item-meta {
    flex: 1;
}

.admin-item-title {
    font-weight: 700;
    font-size: 1.05rem;
}

.admin-item-sub {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 4px;
}

.admin-item-actions {
    display: flex;
    gap: 8px;
}

/* アセットピッカー / 画像アップロード用 */
.asset-picker-trigger {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.admin-asset-preview {
    width: 80px;
    height: 80px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2);
}

.admin-asset-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.asset-picker-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 7, 13, 0.9);
    z-index: 1100;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.asset-picker-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.asset-picker-container {
    background: #0f1624;
    border: 1px solid var(--glass-border);
    width: 90%;
    max-width: 800px;
    height: 80vh;
    border-radius: 24px;
    padding: 32px;
    display: flex;
    flex-direction: column;
}

.asset-picker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.asset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 16px;
    overflow-y: auto;
    flex: 1;
    padding-bottom: 20px;
}

.asset-thumb-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 8px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.asset-thumb-card:hover {
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.05);
}

.asset-thumb-img {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 8px;
}

.asset-thumb-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.asset-thumb-name {
    font-size: 0.7rem;
    color: var(--text-dim);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ログインゲートウェイ */
.login-wrapper {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    width: 100%;
    max-width: 400px;
    padding: 40px;
    border-radius: 24px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    text-align: center;
}

.login-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 32px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* リッチテキスト表示用のCSS */
.rich-text {
    line-height: 1.8;
}

.rich-text p {
    margin-bottom: 16px;
}

.rich-text h1, .rich-text h2, .rich-text h3 {
    color: var(--text-light);
    margin: 28px 0 16px;
}

/* 漫画画像リスト（編集用） */
.manga-images-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.manga-image-entry {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* 通知メッセージ */
.toast-notification {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 16px 32px;
    background: rgba(15, 22, 36, 0.95);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-light);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    z-index: 3000;
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
    font-weight: 600;
}

.toast-notification.active {
    transform: translateY(0);
    opacity: 1;
}

.toast-notification.success {
    border-color: var(--primary-color);
}

.toast-notification.error {
    border-color: var(--accent-color);
}

/* --- レスポンシブメディアクエリ --- */
@media (max-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .about-visual {
        order: -1;
    }
    .admin-main-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header {
        padding: 16px 0;
    }
    .menu-toggle-btn {
        display: block;
    }
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        height: calc(100vh - 80px);
        background: rgba(11, 15, 25, 0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        align-items: center;
        padding-top: 60px;
        gap: 40px;
        transform: translateX(100%);
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        border-top: 1px solid var(--glass-border);
    }
    .nav-menu.active {
        transform: translateX(0);
    }
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    .modal-content-inner {
        padding: 24px;
    }
    .modal-title {
        font-size: 1.8rem;
    }
    .song-lyrics-container {
        padding: 20px;
    }
}