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

/* ---------- BODY ---------- */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f7f7f7;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ---------- HEADER ---------- */
header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    color: #222;
}

header .subtitle {
    display: block;
    font-style: italic;
    color: #555;
    margin-top: 5px;
}

/* ---------- MAIN ---------- */
main {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.presentation p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

/* ---------- BOUTON ---------- */
button {
    padding: 12px 25px;
    font-size: 1rem;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

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

.note {
    font-size: 0.9rem;
    color: #666;
    margin-left: 8px;
}

/* ---------- FOOTER ---------- */
footer {
    text-align: center;
    padding: 15px 0;
    font-size: 0.85rem;
}

footer a {
    color: #888;
    text-decoration: underline;
}

footer a:hover {
    color: #333;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 600px) {
    header h1 {
        font-size: 2rem;
    }
    
    header .subtitle {
        display: block;
        margin-top: 5px;
    }
    
    .presentation p {
        font-size: 1rem;
    }
    
    button {
        width: 100%;
        padding: 12px 0;
    }
}