body {
    position: relative;
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f1faee;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
    background-image: url('../img/background.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.4); /* voile lisibilité */
    z-index: -1;
}

header, footer {
    text-align: center;
    padding: 1rem;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
    text-align: center;
}

h1 {
    color: #4aa3b5;
    font-size: 3rem;
}

p {
    font-size: 1.2rem;
}

.button {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    background-color: #4aa3b5;
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    transition: background-color 0.3s;
}
.button:hover {
    background-color: #3a8a9c;
}

.logo {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    max-width: 320px;
    margin: 0 auto 1rem;
    display: block;
    border-radius: 45%;
    overflow: hidden;
}

.private-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    width: 48px;
    height: 48px;
    padding: 0;
    font-size: 24px;
    text-align: center;
    line-height: 48px;
    border-radius: 8px;
}

.tagline {
    font-size: 1.2rem;
    color: #4aa3b5;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }
    .tagline {
        font-size: 1rem;
    }
}