:root {
    --bg-dark: #070714;
    --neon-blue: #00ffff;
    --neon-pink: #ff00ff;
    --neon-purple: #8a2be2;
    --text-main: #f0f0ff;
    --text-muted: #8888aa;
    --card-bg: rgba(20, 20, 40, 0.7);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Orbitron', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 背景エフェクト */
.video-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 50% 10%, rgba(138, 43, 226, 0.15), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 255, 255, 0.1), transparent 40%);
    z-index: -1;
}

/* ヘッダー */
.header {
    text-align: center;
    padding: 60px 20px 40px;
    border-bottom: 1px solid rgba(0, 255, 255, 0.1);
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent);
}

.logo {
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 4px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--neon-blue);
    text-shadow: 0 0 8px rgba(0, 255, 255, 0.5);
    letter-spacing: 2px;
}

/* メインコンテンツ・グリッド */
.main-content {
    flex: 1;
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

/* ゲームカード */
.game-card {
    text-decoration: none;
    color: inherit;
    display: block;
    perspective: 1000px;
}

.card-inner {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(10px);
}

.game-card:hover .card-inner {
    transform: translateY(-10px) scale(1.02);
    border-color: rgba(0, 255, 255, 0.4);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5),
        0 0 20px rgba(0, 255, 255, 0.2);
}

/* カード画像部分（背景プレースホルダー） */
.card-image {
    height: 160px;
    background-color: #111;
    position: relative;
    background-size: cover;
    background-position: center;
}

.tetris-bg {
    background-image: url('tetris/pinocchio.avif');
}

.placeholder-bg-1 {
    background: linear-gradient(45deg, #2b1055, #7597de);
}

.placeholder-bg-2 {
    background: linear-gradient(45deg, #1c0522, #b92b27);
}

.placeholder-bg-3 {
    background: linear-gradient(45deg, #0f2027, #203a43, #2c5364);
}

.overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, var(--card-bg) 0%, transparent 100%);
}

.game-card:hover .overlay {
    opacity: 0.5;
}

/* カードテキスト */
.card-content {
    padding: 24px;
    position: relative;
}

.game-title {
    font-size: 1.4rem;
    margin-bottom: 8px;
    color: #fff;
    transition: color 0.3s;
}

.game-card:hover .game-title {
    color: var(--neon-pink);
    text-shadow: 0 0 10px rgba(255, 0, 255, 0.5);
}

.game-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-family: sans-serif;
    margin-bottom: 20px;
    line-height: 1.4;
}

/* プレイボタン */
.play-btn {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    letter-spacing: 1px;
    transition: all 0.3s;
}

.game-card:hover .play-btn {
    background: var(--neon-blue);
    color: var(--bg-dark);
    box-shadow: 0 0 10px var(--neon-blue);
}

/* 未解放（無効）カードのスタイル */
.game-card.disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.game-card.disabled:hover .card-inner {
    transform: none;
    border-color: rgba(255, 255, 255, 0.05);
    box-shadow: none;
}

.game-card.disabled:hover .game-title {
    color: #fff;
    text-shadow: none;
}

.game-card.disabled .play-btn {
    border-color: var(--text-muted);
    color: var(--text-muted);
}

.game-card.disabled:hover .play-btn {
    background: transparent;
    color: var(--text-muted);
    box-shadow: none;
}

/* グローテキスト一括 */
.glow-text {
    text-shadow:
        0 0 5px #fff,
        0 0 10px #fff,
        0 0 20px var(--neon-pink),
        0 0 40px var(--neon-pink);
}

/* フッター */
.footer {
    text-align: center;
    padding: 30px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: sans-serif;
}