header {
    display: flex;
    align-items: center; /* centre verticalement */
    gap: 30px;           /* espace entre logo et menu */
	margin-bottom: 30px;
}

.logo {
    vertical-align: middle;
}

.important{
    background: #f7f7f7;
    border-left: 4px solid #003366;
    padding: 15px 20px;
    margin: 25px 0;
}


body {
    font-family: Arial, sans-serif;
    max-width: 1000px;
	font-size: 20px;
    margin: auto;
    padding: 20px;
	/*text-align: center;*/
}

.menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu > li {
    display: inline-block;
    position: relative;
    margin-right: 20px;
}

.menu a {
    display: block;
    padding: 10px 14px;
    text-decoration: none;
    color: black;
    background: #eee;
}

.menu a:hover {
    background: #ccc;
}

.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;

    list-style: none;
    padding: 0;
    margin: 0;

    min-width: 160px;
    background: white;
    border: 1px solid #aaa;
    z-index: 999;
}

.submenu li {
    display: block;
}

.submenu a {
    background: white;
    color: black;
}

.submenu a:hover {
    background: #ddd;
}

.menu li:hover > .submenu {
    display: block;
}

nav {
    background: #f0f0f0;
    padding: 12px;
    border: 1px solid #ccc;
}

nav a {
    text-decoration: none;
    color: #003366;
    font-weight: bold;
    padding: 8px 15px;
}

nav a:hover {
    background: #ddd;
}

h1 {
    font-size: 36px;
    font-weight: bold;
	color: #1b1b1b;
	text-align: left;
}

h2 {
    font-size: 24px;
    font-weight: bold;
	text-align: left;
}

h3 {
    font-size: 18px;
    font-weight: bold;
	color: #333;
	text-align: left;
}