:root {
    --bg-color: #050510;
    --neon-blue: #00f3ff;
    --neon-pink: #ff00ff;
    --neon-green: #00ff9d;
    --text-color: #ffffff;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

#game-container {
    position: relative;
    box-shadow: 0 0 20px var(--neon-blue), 0 0 40px rgba(0, 243, 255, 0.2);
    border: 2px solid var(--neon-blue);
    border-radius: 4px;
}

canvas {
    display: block;
    background: linear-gradient(to bottom, #0a0a2a, #050510);
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#score {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 24px;
    font-weight: bold;
    text-shadow: 0 0 10px var(--neon-blue);
}

#high-score {
    position: absolute;
    top: 50px;
    left: 20px;
    font-size: 18px;
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink);
}

#level-display {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 24px;
    font-weight: bold;
    color: var(--neon-green);
    text-shadow: 0 0 10px var(--neon-green);
}

#gravity-indicator {
    position: absolute;
    top: 50px;
    right: 20px;
    font-size: 20px;
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue);
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(5, 5, 16, 0.85);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: auto;
}

.screen.active {
    opacity: 1;
}

h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink), 0 0 20px var(--neon-pink);
    letter-spacing: 4px;
}

p {
    font-size: 24px;
    color: var(--neon-green);
    text-shadow: 0 0 5px var(--neon-green);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.6;
    }
}

.controls-info {
    margin-top: 40px;
    text-align: center;
}

.key-instruction {
    font-size: 16px;
    color: var(--text-color);
    text-shadow: none;
    animation: none;
    margin: 5px 0;
    opacity: 0.8;
    letter-spacing: 1px;
}