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

body {
    background: #0C0D14;
    color: #fff;
    font-family: 'Courier New', monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

#game-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 640px;
    padding: 10px 4px;
    font-size: 16px;
    letter-spacing: 2px;
}

#score-display {
    color: #00ff88;
}

#high-score-display {
    color: #ffcc00;
}

#lives-display {
    color: #ff4466;
}

#game-canvas {
    display: block;
    background: #0C0D14;
    border: 1px solid #1a1b2e;
    border-radius: 4px;
    image-rendering: pixelated;
}

#wave-display {
    margin-top: 8px;
    font-size: 14px;
    color: #555;
    letter-spacing: 4px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#wave-display.visible {
    opacity: 1;
}

@media (max-width: 680px) {
    #hud {
        font-size: 13px;
        padding: 8px 2px;
    }
}