body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #e5e7eb;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    text-align: center;
}
h1 { color: #1f2937; }
.status { color: #059669; font-weight: bold; }
button {
    margin-top: 1rem;
    padding: 10px 20px;
    background-color: #2563eb;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
button:hover { background-color: #1d4ed8; }