body {font-family: Arial, sans-serif; line-height: 1.7; max-width: 1150px; margin: auto; padding: 20px;}
h1, h2, h3 {color: #1a1a1a;}
.toc a {text-decoration: none; color: #005bbb;}
img {max-width: 100%; margin: 20px 0;}
.section {margin-bottom: 50px;}