body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

nav {
    background-color: #333;
    padding: 10px;
    display: flex;
    gap: 10px;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
}

nav a:hover {
    background-color: #555;
}

nav span {
    color: white;
    margin-left: auto;
}

.container {
    width: 80%;
    margin: auto;
    padding: 20px;
}

.topics, .replies {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.topic, .reply {
    background-color: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

button, .button {
    background-color: #333;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
}

button:hover, .button:hover {
    background-color: #555;
}

textarea, input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.success {
    background-color: #d4edda;
    color: #155724;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
}
/* Navbar */
nav {
    background-color: #2c3e50;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #34495e;
}

/* Catégories */
.categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.category {
    background-color: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.category:hover {
    transform: translateY(-5px);
}

.category h2 {
    margin-top: 0;
    color: #2c3e50;
}

.category a {
    color: #2c3e50;
    text-decoration: none;
}

.category a:hover {
    text-decoration: underline;
}

/* Sujets */
.topics {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.topic {
    background-color: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.topic h2 {
    margin-top: 0;
}

.topic a {
    color: #2c3e50;
    text-decoration: none;
}

.topic a:hover {
    text-decoration: underline;
}