/* Style de base */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: #2c3e50;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    color: #2980b9;
}

/* En-tête */
header {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://source.unsplash.com/random/1200x400/?youth,group');
    background-size: cover;
    background-position: center;
    color: white;
}

/* Cartes */
.card {
    transition: transform 0.3s ease;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* Boutons */
.btn-primary {
    background-color: #3498db;
    border-color: #3498db;
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}

/* Pied de page */
footer {
    background-color: #2c3e50;
}

/* Responsive images */
.img-fluid {
    max-width: 100%;
    height: auto;
}

/* Espacement */
.mb-5 {
    margin-bottom: 3rem !important;
}

.mt-5 {
    margin-top: 3rem !important;
}

/* Navigation */
.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Formulaire */
.form-control {
    border-radius: 0;
    border: 1px solid #ddd;
}

.form-control:focus {
    border-color: #3498db;
    box-shadow: none;
}