:root {
    --neon-blue: #00f3ff;
    --neon-pink: #ff00ff;
    --neon-green: #00ff00;
    --bg-color: #050510;
}

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

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

#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 800px; /* Optional: limit width on large screens */
    max-height: 100vh;
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.2);
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #1a1a2e 0%, #000000 100%);
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to canvas if needed, but buttons need pointer-events: auto */
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    transition: opacity 0.3s ease;
    pointer-events: auto;
}

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

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

h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 10px var(--neon-blue), 0 0 20px var(--neon-blue);
    text-align: center;
}

p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #ccc;
}

button {
    padding: 15px 40px;
    font-size: 1.5rem;
    font-family: 'Orbitron', sans-serif;
    background: transparent;
    color: var(--neon-pink);
    border: 2px solid var(--neon-pink);
    border-radius: 5px;
    cursor: pointer;
    text-shadow: 0 0 5px var(--neon-pink);
    box-shadow: 0 0 10px var(--neon-pink), inset 0 0 10px var(--neon-pink);
    transition: all 0.2s ease;
    text-transform: uppercase;
}

button:hover {
    background: var(--neon-pink);
    color: white;
    box-shadow: 0 0 20px var(--neon-pink), inset 0 0 20px var(--neon-pink);
}

#score-board {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 1.5rem;
    color: var(--neon-green);
    text-shadow: 0 0 5px var(--neon-green);
    pointer-events: none;
}