body {
    font-family: Arial, sans-serif;
    background: linear-gradient(to bottom, lightblue, white);
    margin: 20px;
    line-height: 1.6;
    color: #333;
}

h1 {
    color: #1e3a8a;
    text-align: center;
}

h2 {
    color: #2563eb;
    text-decoration: underline;
}

h3 {
    color: darkblue;
    border-left: 5px solid dodgerblue;
    padding-left: 10px;
    background-color: #e0f2fe;
}

.titre-principal {
    font-size: 3em;
    text-align: center;
    text-decoration: underline;
    font-weight: bold;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

th {
    background-color: #2563eb;
    color: white;
}

td, th {
    padding: 10px;
    text-align: center;
    border: 1px solid #ddd;
}

tr:nth-child(even) {
    background-color: #f2f2f2;
}

.btn {
    background: #2563eb;
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
}

.btn:hover {
    background: #1e40af;
}

.gif-mecano {
    max-width: 50%;
    border-radius: 10px;
    margin-top: 20px;
}

body.easter-bg {
    background: linear-gradient(to right, #f0f8ff, #c0ffee);
}

.btn-secret {
    background-color: dodgerblue;
    color: white;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
}