* {
    box-sizing: border-box;
}

body {
    font-family: "Arial", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    margin: 0;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

h1 {
    font-size: 36px;
    margin: 0 0 30px 0;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    background: linear-gradient(45deg, #FF6B6B, #4ECDC4, #45B7D1, #96CEB4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-layout {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

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

.game-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

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

.info-panel h3 {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-panel div {
    font-size: 24px;
    font-weight: bold;
    color: #4ECDC4;
}

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

.next-piece h3, .hold-piece h3 {
    margin: 0 0 15px 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#next-canvas, #hold-canvas {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

#new-game, #pause-game, #resume-game, #restart-game {
    background: linear-gradient(45deg, #FF6B6B, #4ECDC4);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#new-game:hover, #pause-game:hover, #resume-game:hover, #restart-game:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

#pause-game.paused {
    background: linear-gradient(45deg, #FFA726, #FF7043);
}

.game-main {
    flex: 1;
    display: flex;
    justify-content: center;
}

.game-canvas-container {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

#game-canvas {
    display: block;
    background: #000;
    border: 3px solid #4ECDC4;
}

.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.overlay-content {
    text-align: center;
    color: white;
    padding: 30px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.overlay-content h2 {
    margin: 0 0 15px 0;
    font-size: 28px;
    color: #4ECDC4;
}

.overlay-content p {
    margin: 0 0 20px 0;
    color: rgba(255, 255, 255, 0.9);
}

.instructions {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.instruction-group {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    min-width: 150px;
}

.instruction-group h4 {
    margin: 0 0 15px 0;
    color: #4ECDC4;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.instruction-group p {
    margin: 5px 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
}

.mobile-controls {
    display: none;
    margin-top: 20px;
}

.control-row {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
}

.control-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: white;
    font-size: 16px;
    font-weight: bold;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 60px;
}

.control-btn:active {
    background: rgba(78, 205, 196, 0.5);
    transform: scale(0.95);
}

.hidden {
    display: none !important;
}

/* Tetris piece colors */
.piece-i { background: #00f0f0; } /* Cyan */
.piece-o { background: #f0f000; } /* Yellow */
.piece-t { background: #a000f0; } /* Purple */
.piece-s { background: #00f000; } /* Green */
.piece-z { background: #f00000; } /* Red */
.piece-j { background: #0000f0; } /* Blue */
.piece-l { background: #f0a000; } /* Orange */

/* Game animations */
@keyframes lineComplete {
    0% { opacity: 1; }
    50% { opacity: 0.3; }
    100% { opacity: 1; }
}

.line-complete {
    animation: lineComplete 0.3s ease-in-out 3;
}

@keyframes levelUp {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.level-up {
    animation: levelUp 0.5s ease-in-out;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 24px;
        margin-bottom: 20px;
    }
    
    .game-layout {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    
    .game-sidebar {
        order: 2;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        min-width: auto;
        max-width: 100%;
    }
    
    .game-info {
        flex-direction: row;
        gap: 10px;
    }
    
    .info-panel {
        padding: 10px;
        min-width: 80px;
    }
    
    .info-panel div {
        font-size: 18px;
    }
    
    .next-piece, .hold-piece {
        padding: 10px;
    }
    
    #next-canvas, #hold-canvas {
        width: 80px;
        height: 80px;
    }
    
    #game-canvas {
        width: 250px;
        height: 500px;
    }
    
    .instructions {
        flex-direction: column;
        gap: 15px;
    }
    
    .instruction-group {
        padding: 15px;
        min-width: auto;
    }
    
    .mobile-controls {
        display: block;
    }
}

@media (max-width: 480px) {
    .game-info {
        flex-direction: column;
        gap: 8px;
    }
    
    .game-sidebar {
        flex-direction: column;
        align-items: center;
    }
    
    #game-canvas {
        width: 200px;
        height: 400px;
    }
    
    .control-btn {
        padding: 10px 12px;
        font-size: 14px;
        min-width: 50px;
    }
}