body {
    margin: 0;
    background: #0b0b10;
    color: #fff;
    font-family: Segoe UI, Arial;
}

header {
    text-align: center;
    padding: 40px 20px;
    background: #15151c;
}

h1 {
    margin: 0;
    font-size: 36px;
}

.subtitle {
    color: #bbb;
    margin-top: 10px;
}

.container {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: #15151c;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    background: #e53935;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    margin-top: 20px;
}

.btn:hover {
    background: #ff5252;
}

footer {
    text-align: center;
    padding: 20px;
    color: #777;
    font-size: 13px;
}