:root {
    --bg-color: #050505;
    --grid-color: #1a1a1a;
    --snake-color: #00ff88;
    --snake-glow: 0 0 10px #00ff88, 0 0 20px #00ff88;
    --food-color: #ff0055;
    --food-glow: 0 0 10px #ff0055, 0 0 20px #ff0055;
    --wall-color: #00ccff;
    --wall-glow: 0 0 5px #00ccff, 0 0 10px #00ccff;
    --text-color: #ffffff;
    --font-family: 'Courier New', Courier, monospace;
}

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

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;
}

.ui-panel {
    text-align: center;
    width: 100%;
    max-width: 600px;
}

h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
    letter-spacing: 5px;
}

.score-board {
    display: flex;
    justify-content: space-between;
    font-size: 1.2rem;
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #333;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 5px;
}

.instructions {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 15px;
}

canvas {
    background-color: var(--bg-color);
    border: 2px solid #333;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

button {
    background: transparent;
    color: var(--snake-color);
    border: 2px solid var(--snake-color);
    padding: 10px 30px;
    font-size: 1.2rem;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.2);
}

button:hover {
    background: var(--snake-color);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--snake-color);
}

@media (max-width: 650px) {
    .game-container {
        width: 100%;
        padding: 10px;
    }

    h1 {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    canvas {
        width: 100%;
        height: auto;
        max-width: 600px;
    }

    .score-board {
        font-size: 1rem;
        flex-direction: column;
        gap: 5px;
        align-items: center;
    }

    button {
        padding: 8px 20px;
        font-size: 1rem;
    }
}