body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0d0d0d;
    color: white;
}

/* HEADER FIXE */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: #000; /* Bande noire */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px 0;
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.1);
    z-index: 1000;
}

.header img {
    height: 90px; /* Logo plus grand et étiré */
    width: auto;
}

/* CONTENU PRINCIPAL */
.container {
    padding: 150px 20px 50px 20px; /* espace pour éviter le header */
    text-align: center;
}

h1 {
    margin-bottom: 40px;
    font-size: 48px;
}

.input-box {
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}

input {
    padding: 15px;
    font-size: 20px;
    width: 350px;
    border: none;
    border-radius: 5px;
    margin-bottom: 20px;
}

button {
    padding: 12px 25px;
    font-size: 18px;
    background: #ffcc00;
    color: #000;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #e6b800;
}

#result {
    font-size: 24px;
    margin-top: 30px;
    color: #aaa;
}