:root {
    --bg-color: #0d0d15;
    --primary-color: #0f0;   /* Green */
    --accent-color: #f00;    /* Red */
    --secondary-color: #0ff; /* Cyan */
    --text-color: #fff;
    --font-family: 'Orbitron', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#game-container {
    position: relative;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
    border: 2px solid #333;
}

canvas {
    display: block;
    background-color: #000;
}

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

#score-board, #lives-board {
    position: absolute;
    top: 10px;
    font-size: 20px;
    text-shadow: 0 0 5px var(--text-color);
}

#score-board {
    left: 20px;
    color: var(--text-color);
}

#lives-board {
    right: 20px;
    color: var(--text-color);
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: opacity 0.3s ease;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

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

h1 {
    font-size: 60px;
    margin-bottom: 20px;
    color: var(--secondary-color);
    text-shadow: 0 0 10px var(--secondary-color), 0 0 20px var(--secondary-color);
}

p {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.controls {
    font-size: 16px;
    color: #888;
    margin-top: 20px;
    text-transform: uppercase;
}

.blink {
    animation: blinker 1s linear infinite;
    color: var(--primary-color);
    text-shadow: 0 0 5px var(--primary-color);
}

@keyframes blinker {
    50% {
        opacity: 0;
    }
}