:root {
    --neon-blue: #00f3ff;
    --neon-pink: #ff00ff;
    --neon-green: #00ff00;
    --neon-yellow: #ffff00;
    --neon-red: #ff0000;
    --bg-color: #050505;
    --glass-bg: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: #fff;
    font-family: 'Orbitron', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

#game-container {
    position: relative;
    width: 800px;
    height: 600px;
    box-shadow: 0 0 20px var(--neon-blue), 0 0 50px rgba(0, 243, 255, 0.2);
    border: 2px solid var(--neon-blue);
    background: radial-gradient(circle at center, #1a1a1a 0%, #000000 100%);
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* HUD */
#hud {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    text-shadow: 0 0 5px var(--neon-blue);
    font-size: 1.2rem;
    z-index: 10;
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 20;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* Typography */
h1.title {
    font-size: 4rem;
    margin-bottom: 2rem;
    color: #fff;
    text-shadow:
        0 0 5px #fff,
        0 0 10px #fff,
        0 0 20px var(--neon-pink),
        0 0 40px var(--neon-pink),
        0 0 80px var(--neon-pink);
    animation: pulse 2s infinite alternate;
}

@keyframes pulse {
    from {
        text-shadow: 0 0 10px #fff, 0 0 20px var(--neon-pink), 0 0 40px var(--neon-pink);
    }

    to {
        text-shadow: 0 0 20px #fff, 0 0 30px var(--neon-pink), 0 0 50px var(--neon-pink), 0 0 100px var(--neon-pink);
    }
}

/* Buttons */
.glow-btn {
    padding: 15px 40px;
    font-size: 1.5rem;
    font-family: 'Orbitron', sans-serif;
    background: transparent;
    color: var(--neon-blue);
    border: 2px solid var(--neon-blue);
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
    transition: all 0.3s ease;
    margin-top: 20px;
}

.glow-btn:hover {
    background: var(--neon-blue);
    color: #000;
    box-shadow: 0 0 30px var(--neon-blue);
}

/* Difficulty Selector */
.difficulty-selector {
    margin-bottom: 2rem;
    text-align: center;
}

.difficulty-selector p {
    margin-bottom: 10px;
    color: var(--neon-green);
}

.difficulty-buttons {
    display: flex;
    gap: 10px;
}

.diff-btn {
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--neon-green);
    color: var(--neon-green);
    font-family: 'Orbitron', sans-serif;
    cursor: pointer;
    transition: all 0.2s;
}

.diff-btn:hover,
.diff-btn.selected {
    background: var(--neon-green);
    color: #000;
    box-shadow: 0 0 15px var(--neon-green);
}

.controls-info {
    margin-top: 30px;
    font-size: 0.9rem;
    color: #aaa;
}