* {
    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: linear-gradient(180deg, #0a0a1a 0%, #0f0f2a 50%, #0a0a1a 100%);
    border: 2px solid #00ffff;
    box-shadow: 
        0 0 20px rgba(0, 255, 255, 0.5),
        0 0 40px rgba(0, 255, 255, 0.3),
        inset 0 0 60px rgba(0, 255, 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 #00ffff;
    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: #ff00ff;
    font-size: 10px;
    text-shadow: 0 0 10px #ff00ff;
}

.hud-item span:last-child {
    color: #00ffff;
    font-size: 18px;
    font-weight: bold;
    text-shadow: 0 0 10px #00ffff;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 20, 0.9);
    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: 48px;
    font-weight: 900;
    color: #00ffff;
    text-shadow: 
        0 0 10px #00ffff,
        0 0 20px #00ffff,
        0 0 40px #00ffff,
        0 0 80px #00ffff;
    margin-bottom: 10px;
    letter-spacing: 4px;
    animation: glow 2s ease-in-out infinite alternate;
}

.title.game-over {
    color: #ff0066;
    text-shadow: 
        0 0 10px #ff0066,
        0 0 20px #ff0066,
        0 0 40px #ff0066;
}

.subtitle {
    color: #ff00ff;
    font-size: 14px;
    letter-spacing: 3px;
    margin-bottom: 40px;
    text-shadow: 0 0 10px #ff00ff;
}

.instructions {
    text-align: center;
    margin-bottom: 40px;
    color: #aaa;
    line-height: 2;
    font-size: 13px;
    letter-spacing: 1px;
}

.instructions p {
    margin: 5px 0;
}

.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: 20px;
    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;
}

.wave-title {
    font-size: 36px;
    color: #ffff00;
    text-shadow: 
        0 0 10px #ffff00,
        0 0 20px #ffff00,
        0 0 40px #ffff00;
    letter-spacing: 4px;
    animation: pulse 0.5s ease-in-out;
}

@keyframes glow {
    from {
        text-shadow: 
            0 0 10px #00ffff,
            0 0 20px #00ffff,
            0 0 40px #00ffff;
    }
    to {
        text-shadow: 
            0 0 20px #00ffff,
            0 0 40px #00ffff,
            0 0 80px #00ffff,
            0 0 120px #00ffff;
    }
}

@keyframes pulse {
    0% { transform: scale(0.5); opacity: 0; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}