:root {
    --bg-color: #0f0f13;
    --canvas-bg: #1a1a24;
    --neon-green: #39ff14;
    --neon-green-glow: 0 0 10px #39ff14, 0 0 20px #39ff14, 0 0 30px #39ff14;
    --neon-red: #ff073a;
    --neon-red-glow: 0 0 10px #ff073a, 0 0 20px #ff073a, 0 0 30px #ff073a;
    --text-color: #e0e0e0;
    --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);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 400px;
}

h1 {
    font-size: 24px;
    color: var(--neon-green);
    text-shadow: var(--neon-green-glow);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.score-board {
    font-size: 18px;
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid rgba(57, 255, 20, 0.3);
}

#score {
    color: var(--neon-green);
    font-weight: bold;
    text-shadow: 0 0 5px var(--neon-green);
}

.canvas-wrapper {
    position: relative;
    width: 400px;
    height: 400px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(57, 255, 20, 0.2);
    border: 2px solid rgba(57, 255, 20, 0.5);
}

canvas {
    background-color: var(--canvas-bg);
    display: block;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 15, 19, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 20px;
    transition: opacity 0.3s ease;
}

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

.overlay h2 {
    font-size: 32px;
    color: var(--neon-red);
    text-shadow: var(--neon-red-glow);
    text-transform: uppercase;
}

#startScreen h2 {
    color: var(--neon-green);
    text-shadow: var(--neon-green-glow);
}

.overlay p {
    font-size: 16px;
    color: #ccc;
}

#finalScore {
    color: var(--neon-green);
    font-size: 24px;
    font-weight: bold;
    text-shadow: 0 0 8px var(--neon-green);
}

button {
    background: transparent;
    color: var(--neon-green);
    font-family: var(--font-family);
    font-size: 18px;
    padding: 12px 24px;
    border: 2px solid var(--neon-green);
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    box-shadow: 0 0 10px rgba(57, 255, 20, 0.2) inset;
}

button:hover {
    background: var(--neon-green);
    color: #000;
    box-shadow: var(--neon-green-glow);
}