.not-found-page {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

#snake-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
}

.snake-overlay {
    position: relative;
    z-index: 10;
    text-align: center;
    background: var(--bg-overlay);
    padding: 3rem 4rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.snake-overlay h1 {
    font-family: var(--font-display);
    font-size: 6rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    line-height: 1;
}

.snake-overlay p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.snake-instructions {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: 1.5rem;
}

.snake-instructions span {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    margin: 0 0.25rem;
    font-family: var(--font-mono);
}

.snake-score {
    position: absolute;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--primary);
    background: var(--bg-overlay);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    z-index: 10;
}

@media (max-width: 480px) {
    .snake-overlay {
        padding: 2rem;
        margin: 1rem;
    }

    .snake-overlay h1 {
        font-size: 4rem;
    }

    .snake-overlay p {
        font-size: 1rem;
    }
}