body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0a0a0a;
    color: #ffffff;
}

/* HEADER */
header {
    text-align: center;
    padding: 70px 20px;
    background: linear-gradient(135deg, #111, #1a1a1a);
}

header h1 {
    font-size: 40px;
    margin-bottom: 10px;
}

header p {
    color: #00e5ff;
    font-size: 16px;
}

/* BOUTONS */
.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 22px;
    background: #00e5ff;
    color: #000;
    text-decoration: none;
    font-weight: bold;
    border-radius: 6px;
}

.btn:hover {
    background: #00bcd4;
}

/* NAV */
nav {
    text-align: center;
    background: #111;
    padding: 15px;
}

nav a {
    color: #00e5ff;
    text-decoration: none;
    margin: 0 10px;
    font-weight: bold;
}

nav a:hover {
    color: #ffffff;
}

/* SECTIONS */
section {
    max-width: 900px;
    margin: auto;
    padding: 50px 20px;
}

h2 {
    color: #00e5ff;
    margin-bottom: 20px;
    text-align: center;
}

/* CARTES */
.card {
    background: #141414;
    padding: 20px;
    margin: 15px 0;
    border-left: 4px solid #00e5ff;
    border-radius: 6px;
}

/* FORMULAIRE */
form {
    display: flex;
    flex-direction: column;
}

form input,
form textarea {
    margin: 10px 0;
    padding: 10px;
    border: none;
    border-radius: 5px;
    background: #1e1e1e;
    color: #fff;
}

form button {
    padding: 12px;
    background: #00e5ff;
    border: none;
    font-weight: bold;
    cursor: pointer;
    border-radius: 6px;
}

form button:hover {
    background: #00bcd4;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 20px;
    background: #000;
    color: #777;
    margin-top: 30px;
}