body {
    margin: 0;
    padding: 0;
    background: #fafafa; /* Fondo limpio tipo Google Snake */
    font-family: "Roboto", "Segoe UI", Arial, sans-serif;
    text-align: center;
    color: #222;

    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Título estilo Google Snake */
h2 {
    margin-top: 60px;
    font-size: 42px;
    color: #4caf50; /* Verde de la serpiente */
    font-weight: 700;
    text-shadow: 1px 1px #a5d6a7; /* sombra sutil tipo bloque */
}

/* Caja estilo tablero */
.container {
    margin-top: 50px;
    padding: 40px 55px;
    background: #ffffff; /* Blanco limpio */
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border: 2px solid #e0e0e0;
}

/* Botón estilo retro juego Snake */
button {
    margin-top: 20px;
    padding: 12px 28px;
    font-size: 16px;
    font-family: inherit;
    color: white;
    background: #4caf50; /* Verde de la serpiente */
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

button:hover {
    background: #43a047;
    transform: scale(1.05);
}

/* Botón secundario estilo tablero */
.back-btn {
    margin: 30px 0 60px 0;
    padding: 12px 32px;
    font-size: 16px;
    font-family: inherit;
    color: white;
    background: #ff5722; /* Color de fruta o power-up */
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.back-btn:hover {
    background: #e64a19;
    transform: scale(1.05);
}