body { font-family: Arial, sans-serif; margin:0; line-height:1.6; }
header { background:#2c3e50; color:#fff; padding:1rem; text-align:center; }
nav ul { list-style:none; display:flex; justify-content:center; padding:0; }
nav ul li { margin:0 1rem; }
nav ul li a { color:#fff; text-decoration:none; }
.hero, .presentation, .activities, .team, .contact { padding:2rem; text-align:center; }
.hero img, .activities img, .team img { max-width:100%; height:auto; margin-top:1rem; }
footer { background:#34495e; color:#fff; text-align:center; padding:1rem; }
form input, form textarea { width:80%; padding:0.5rem; margin-bottom:1rem; }
form button { padding:0.5rem 1rem; background:#2c3e50; color:#fff; border:none; cursor:pointer; }
form button:hover { background:#1a252f; }