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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    width: 90%;
    max-width: 600px;
    margin: 2rem auto;
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

select, textarea, input[type="text"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    display: block;
    width: 100%;
    padding: 0.75rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2980b9;
}

#message-result, #historique {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 4px;
}

.message-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 1rem;
}

.message-actions button {
    width: 48%;
}

.hidden {
    display: none;
}

#historique-list {
    list-style-type: none;
}

#historique-list li {
    background-color: #fff;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
    .container {
        width: 95%;
        padding: 1rem;
    }
}