* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #212121;
    color: #fff;
    padding: 20px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 a {
    color: #fff;
    text-decoration: none;
    font-size: 1.8em;
}

header nav ul {
    list-style: none;
    display: flex;
    gap: 15px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 3px;
    transition: background-color 0.3s;
}

header nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

main h3 {
    margin-bottom: 20px;
    color: #212121;
    font-size: 1.6em;
}

.billet {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.billet h2 {
    font-size: 1.4em;
    margin-bottom: 10px;
    color: #0d0d0d;
}

.billet p {
    margin: 10px 0;
}

.billet em {
    font-size: 0.9em;
    color: #555;
}

.btn-commentaire {
    background-color: #212121;
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s ease;
    margin-top: 10px;
}

.btn-commentaire:hover {
    background-color: rgb(79, 79, 79);
}

.commentaires {
    background-color: #f4f4f4;
    padding: 10px;
    margin-top: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
    display: none;
}

.commentaires p {
    margin: 5px 0;
    font-size: 0.9em;
    color: #555;
}

.commentaires h4 {
    font-size: 1em;
    color: #333;
    margin-bottom: 10px;
}

.form-commentaire {
    margin-top: 10px;
    background-color: #fff;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.form-commentaire textarea {
    width: 100%;
    height: 80px;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
}

.form-commentaire button {
    background-color: #212121;
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 1em;
}

.form-commentaire button:hover {
    background-color: #666666;
}

.photo-profil {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
    vertical-align: middle;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

footer {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
    margin-top: 20px;
    font-size: 0.9em;
}

footer p {
    margin: 0;
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    header nav ul {
        flex-direction: column;
        gap: 10px;
    }

    .billet {
        padding: 15px;
    }
}