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

body {
    font-family: system-ui, -apple-system, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f5f5f5;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 2.5rem 3rem;
    box-shadow: 0 2px 12px rgba(0, 0, 0, .08);
    text-align: center;
    max-width: 480px;
}

h1 {
    margin-bottom: 0.6rem;
    color: #222;
}

p {
    margin-bottom: 1.5rem;
    color: #555;
}

.btn {
    display: inline-block;
    padding: 0.7rem 1.6rem;
    background: #222;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: background 0.15s;
}

.btn:hover {
    background: #444;
}