/* Base styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 20px;
}

/* Mobile styles */
@media (max-width: 600px) {
    .container {
        padding: 10px;
    }

    .header, .footer {
        text-align: center;
    }

    .nav {
        display: none;
    }

    .content {
        font-size: 14px;
    }
}

/* Tablet styles */
@media (min-width: 601px) and (max-width: 1024px) {
    .container {
        padding: 15px;
    }

    .header, .footer {
        text-align: center;
    }

    .nav {
        display: block;
        text-align: center;
    }

    .content {
        font-size: 16px;
    }
}