body {
    background-color: #f4f6f9;
    padding-top: 80px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card {
    max-width: 600px;
    margin: 0 auto;
    border-radius: 16px;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.08);
    background-color: #ffffff;
}

h3 {
    font-size: 1.8rem;
}

.btn-danger {
    font-weight: bold;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(220, 53, 69, 0.3);
}

.btn-danger:hover {
    background-color: #bb2d3b;
}

input[type="file"] {
    border-radius: 10px;
    padding: 10px;
}