body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: linear-gradient(135deg, #f3f5f7, #e0e3e7);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.wrapper {
    background: white;
    padding: 50px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    text-align: center;
    max-width: 500px;
    animation: fadeIn 1s ease-in-out;
}
h1 {
    margin-bottom: 20px;
    font-size: 28px;
    color: #333;
}
p {
    color: #666;
    line-height: 1.5;
    margin-bottom: 30px;
}
button {
    padding: 12px 28px;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease;
}
button:hover {
    background: #357ab8;
}
.footer {
    margin-top: 25px;
    font-size: 13px;
    color: #999;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}