/* Reset de base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Typographie et fond général */
body {
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.6;
    background-color: #f5f6fa;
    color: #2f3640;
    padding: 1rem;
}

header {
    background-color: #273c75;
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 1rem;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

header h2 {
    font-size: 1.2rem;
    font-weight: normal;
}

/* Navigation */
nav {
    margin-bottom: 1.5rem;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    list-style: none;
}

.nav-list li a {
    background-color: #40739e;
    color: white;
    text-decoration: none;
    padding: 0.75rem;
    border-radius: 5px;
    text-align: center;
    display: block;
    transition: background-color 0.3s ease;
}

.nav-list li a:hover {
    background-color: #3498db;
}

/* Contenu principal */
.container {
    max-width: 900px;
    margin: 0 auto;
}

main section {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0,0,0,0.05);
}

/* Responsive pour desktop */
@media (min-width: 768px) {
    .nav-list {
        flex-direction: row;
        justify-content: center;
    }

    .nav-list li a {
        min-width: 120px;
    }

    header h1 {
        font-size: 3rem;
    }

    header h2 {
        font-size: 1.5rem;
    }
}