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

body {
    background: #0a0a0f;
    font-family: 'Orbitron', monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    color: #fff;
}

.game-container {
    position: relative;
    width: 800px;
    height: 600px;
}

#gameCanvas {
    display: block;
    background: #0f0f1a;
    border: 2px solid #ff00ff;
    box-shadow: 
        0 0 20px rgba(255, 0, 255, 0.5),
        0 0 40px rgba(255, 0, 255, 0.3),
        inset 0 0 60px rgba(255, 0, 255, 0.1);
    border-radius: 4px;
}

.hud {
    display: flex;
    justify-content: space-between;
    padding: 15px 20px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid #ff00ff;
    border-bottom: none;
    border-radius: 4px 4px 0 0;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hud-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hud-item .label {
    color: #00ffff;
    font-size: 10px;
    text-shadow: 0 0 10px #00ffff;
}

.hud-item span:last-child {
    color: #ff00ff;
    font-size: 18px;
    font-weight: bold;
    text-shadow: 0 0 10px #ff00ff;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 20, 0.92);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    backdrop-filter: blur(5px);
}

.overlay.hidden {
    display: none;
}

.title {
    font-size: 52px;
    font-weight: 900;
    color: #ff00ff;
    text-shadow: 
        0 0 10px #ff00ff,
        0 0 20px #ff00ff,
        0 0 40px #ff00ff,
        0 0 80px #ff00ff;
    margin-bottom: 10px;
    letter-spacing: 4px;
    animation: glow 2s ease-in-out infinite alternate;
}

.title.game-over {
    color: #ff3366;
    text-shadow: 
        0 0 10px #ff3366,
        0 0 20px #ff3366,
        0 0 40px #ff3366;
}

.subtitle {
    color: #00ffff;
    font-size: 14px;
    letter-spacing: 3px;
    margin-bottom: 40px;
    text-shadow: 0 0 10px #00ffff;
}

.instructions {
    text-align: center;
    margin-bottom: 40px;
    color: #aaa;
    line-height: 2.2;
    font-size: 13px;
    letter-spacing: 1px;
}

.neon-btn {
    background: transparent;
    border: 2px solid #00ff00;
    color: #00ff00;
    padding: 15px 40px;
    font-family: 'Orbitron', monospace;
    font-size: 16px;
    font-weight: bold;
    letter-spacing: 3px;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.3s ease;
    text-shadow: 0 0 10px #00ff00;
    box-shadow: 
        0 0 10px rgba(0, 255, 0, 0.5),
        inset 0 0 10px rgba(0, 255, 0, 0.1);
    border-radius: 2px;
}

.neon-btn:hover {
    background: rgba(0, 255, 0, 0.2);
    box-shadow: 
        0 0 20px rgba(0, 255, 0, 0.8),
        0 0 40px rgba(0, 255, 0, 0.4),
        inset 0 0 20px rgba(0, 255, 0, 0.2);
    transform: scale(1.05);
}

.neon-btn:active {
    transform: scale(0.98);
}

.final-score, .wave-reached {
    font-size: 18px;
    margin: 10px 0;
    color: #fff;
    letter-spacing: 2px;
}

.final-score span, .wave-reached span {
    color: #ffff00;
    text-shadow: 0 0 10px #ffff00;
    font-size: 24px;
}

@keyframes glow {
    from {
        text-shadow: 
            0 0 10px #ff00ff,
            0 0 20px #ff00ff,
            0 0 40px #ff00ff;
    }
    to {
        text-shadow: 
            0 0 20px #ff00ff,
            0 0 40px #ff00ff,
            0 0 80px #ff00ff,
            0 0 120px #ff00ff;
    }
}