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

        body {
            background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
            font-family: 'Arial', sans-serif;
            color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .game-container {
            display: flex;
            gap: 30px;
            align-items: flex-start;
            max-width: 1200px;
        }

        .game-board {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 20px;
            border: 2px solid rgba(255, 255, 255, 0.2);
        }

        .grid-container {
            position: relative;
        }

        #gameGrid {
            display: grid;
            grid-template-columns: repeat(10, 30px);
            grid-template-rows: repeat(20, 30px);
            gap: 1px;
            background: #000;
            border: 2px solid #333;
            border-radius: 8px;
            padding: 2px;
        }

        .cell {
            width: 30px;
            height: 30px;
            background: #111;
            border: 1px solid #222;
            transition: all 0.1s ease;
        }

        .cell.filled {
            border: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: inset 0 0 10px rgba(255, 255, 255, 0.1);
        }

        .info-panel {
            display: flex;
            flex-direction: column;
            gap: 20px;
            min-width: 200px;
        }

        .info-card {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 12px;
            padding: 15px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .info-card h3 {
            color: #4fc3f7;
            font-size: 1.1rem;
            margin-bottom: 10px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .stat-value {
            font-size: 1.5rem;
            font-weight: bold;
            color: white;
        }

        .next-piece-container {
            width: 120px;
            height: 80px;
            background: #000;
            border: 2px solid #333;
            border-radius: 8px;
            position: relative;
            margin: 10px auto;
        }

        #nextPieceGrid {
            display: grid;
            grid-template-columns: repeat(4, 25px);
            grid-template-rows: repeat(4, 20px);
            gap: 1px;
            padding: 5px;
            justify-content: center;
            align-content: center;
            height: 100%;
        }

        .next-cell {
            width: 25px;
            height: 20px;
            background: #111;
            border-radius: 2px;
        }

        .next-cell.filled {
            border: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: inset 0 0 5px rgba(255, 255, 255, 0.1);
        }

        .controls {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .control-btn {
            background: linear-gradient(135deg, #667eea, #764ba2);
            border: none;
            padding: 12px 20px;
            border-radius: 8px;
            color: white;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .control-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
        }

        .control-btn:active {
            transform: translateY(0);
        }

        .control-btn.danger {
            background: linear-gradient(135deg, #ff6b6b, #ee5a52);
        }

        .level-selector {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .level-buttons {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 5px;
        }

        .level-btn {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 8px;
            border-radius: 6px;
            color: white;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 0.9rem;
        }

        .level-btn:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .level-btn.active {
            background: linear-gradient(135deg, #4fc3f7, #29b6f6);
            border-color: #4fc3f7;
        }

        .game-over-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .game-over-content {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(20px);
            border-radius: 20px;
            padding: 40px;
            text-align: center;
            border: 2px solid rgba(255, 255, 255, 0.2);
            max-width: 400px;
        }

        .game-over-title {
            font-size: 2.5rem;
            color: #ff6b6b;
            margin-bottom: 20px;
        }

        .final-stats {
            font-size: 1.2rem;
            margin: 20px 0;
            color: #4fc3f7;
        }

        

        .instructions {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(0, 0, 0, 0.8);
            padding: 10px 20px;
            border-radius: 20px;
            font-size: 0.9rem;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.2);
            margin-bottom: 50px;
        }

        .pause-indicator {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 2rem;
            font-weight: bold;
            color: #4fc3f7;
            background: rgba(0, 0, 0, 0.8);
            padding: 20px 40px;
            border-radius: 10px;
            display: none;
            z-index: 100;
        }

        .back-to-index {
  background-color: #4fc3f7;
}

.sound-toggle {
            position: fixed;
            top: 24px;
            right: 24px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            width: 64px;
            height: 64px;
            font-size: 1.8rem;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1000;
            color: white;
            backdrop-filter: blur(16px);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sound-toggle:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: scale(1.1) rotate(10deg);
        }

        @media (max-width: 768px) {
            .game-container {
                flex-direction: column;
                align-items: center;
                gap: 20px;
            }
            
            .info-panel {
                flex-direction: row;
                flex-wrap: wrap;
                justify-content: center;
                min-width: auto;
            }
            
            .info-card {
                flex: 1;
                min-width: 150px;
            }
        }