body {
    background-color: #0f172a; /* fond sombre élégant */
    color: white;
    font-family: 'Poppins', sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
}

/* Conteneur principal */
main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 80vh;
    gap: 2vw;
    padding: 20px;
}

/* Titre */
h1 {
    font-size: 2.5rem;
    font-weight: 800;
    width: 100%;
    margin: 0;
    user-select: none;
}

/* Boutons principaux */
button {
    background: linear-gradient(to bottom, #02ff5b, #00cc44);
    border-radius: 8px;
    padding: 12px 24px;
    border: none;
    outline: none;
    color: white;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

button:hover {
    background: linear-gradient(to bottom, #00e65f, #00b33c);
    transform: translateY(-2px);
}

button:focus {
    box-shadow: 0 0 0 3px rgba(2, 255, 91, 0.3);
}

/* Lien retour à l'accueil */
.returnHome {
    position: absolute;
    top: 30px;
    left: 30px;
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: text-decoration 0.2s ease;
}

.returnHome:hover {
    text-decoration: underline;
}