body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f2f5;
}
.container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}
textarea {
    width: 100%;
    height: 150px;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    resize: none;
    font-size: 16px;
    transition: border-color 0.3s;
}
textarea:focus {
    border-color: #007bff;
    outline: none;
}
button {
    margin-top: 10px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    position: relative;
}
button:hover {
    background-color: #0056b3;
}
button:active {
    transform: scale(0.98);
}
button.copied {
    background-color: #28a745;
    transition: background-color 0.3s;
}
button.copied::after {
    content: "✔ Copié !";
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    background: #28a745;
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 14px;
    opacity: 1;
    transition: opacity 0.5s;
}
button.copied::after {
    animation: fadeOut 1s forwards;
}
@keyframes fadeOut {
    0% { opacity: 1; }
    100% { opacity: 0; }
}