body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, sans-serif;
    color: white;
    text-align: center;
    overflow: hidden;

    background: linear-gradient(-45deg, midnightblue, darkslateblue, black, darkblue);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}


.accueil-container {
    background: rgba(0, 0, 0, 0.7);
    padding: 40px 50px;
    border-radius: 15px;
    box-shadow: 0 0 30px navy;
    width: 60%;
    max-width: 700px;
    animation: fadeIn 1s ease forwards;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 25px;
    text-shadow: 0 0 8px white, 0 0 12px gold;
}

p {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

ul {
    list-style: circle;
    padding-left: 30px;
    margin-bottom: 25px;
    text-align: left;
}
ul li {
    margin: 10px 0;
    font-size: 1.1rem;
    position: relative;
    padding-left: 20px;


}


#firstname {
    margin-bottom: 20px;
}

#firstname input {
    padding: 10px;
    font-size: 1rem;
    border: none;
    border-radius: 6px;
    width: 60%;
    text-align: center;
    background: white;
    color: black;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
    transition: transform 0.2s ease;
}

#firstname input:focus {
    outline: none;
    transform: scale(1.05);
}

button {
    background: gold;
    color: black;
    font-size: 1.3rem;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    box-shadow: 0 0 10px yellow;
    animation: fadeIn 1.2s ease forwards, pulse 2.5s ease-in-out infinite;
}

button:hover {
    background: goldenrod;
    transform: scale(1.05);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% { box-shadow: 0 0 10px yellow; }
    50% { box-shadow: 0 0 20px gold; }
    100% { box-shadow: 0 0 10px yellow; }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}