/* Mobile-First CSS */
* { box-sizing: border-box; }
body { font-family: Arial, sans-serif; font-size: 16px; margin: 0; line-height: 1.5; color: #333; }
.container { max-width: 100%; padding: 10px; display: flex; flex-direction: column; min-height: 100vh; }
header { text-align: center; padding: 10px; background: #f4f4f4; }
header img { max-width: 150px; height: auto; }
nav { background: #333; }
nav .menu-toggle { display: block; padding: 15px; font-size: 18px; width: 100%; background: #444; color: white; border: none; cursor: pointer; }
nav ul { list-style: none; margin: 0; padding: 0; display: none; }
nav ul.show { display: block; }
nav li { padding: 15px; border-bottom: 1px solid #555; }
nav a { color: white; text-decoration: none; font-size: 18px; display: block; min-height: 48px; }
main { flex: 1; padding: 20px 0; }
img { max-width: 100%; height: auto; loading: lazy; }
.cta { padding: 15px; font-size: 16px; min-width: 48px; background: #007bff; color: white; border: none; cursor: pointer; }
footer { background: #333; color: white; text-align: center; padding: 20px; }
footer a { color: #ddd; }

/* Desktop/Tablet */
@media (min-width: 768px) {
    .container { max-width: 1200px; margin: 0 auto; }
    nav .menu-toggle { display: none; }
    nav ul { display: flex; justify-content: center; }
    nav li { border: none; margin: 0 10px; }
    main { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
}