body {
    font-family: 'Helvetica', 'Arial', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    padding: 15px;
    box-sizing: border-box;
}

/* Images responsive */
img {
    max-width: 100%;
    height: auto;
}

/* Tables responsive */
table {
    width: 100%;
    border-collapse: collapse;
}
table th, table td {
    padding: 8px;
    border: 1px solid #ccc;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    margin-top: 1em;
    margin-bottom: 0.5em;
    font-weight: 600;
}

/* Responsive iframes (for embeds like YouTube) */
iframe {
    max-width: 100%;
}

/* Bullet and number lists */
ul, ol {
    margin: 1em 0;
    padding-left: 2em;
}

/* Links */
a {
    color: #007bff;
    text-decoration: underline;
}