body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6fb;
    color: #222;
}

.top-menu {
    background: #222;
    padding: 15px;
    text-align: center;
}

.top-menu a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

.top-menu a:hover {
    text-decoration: underline;
}

.card {
    width: 90%;
    max-width: 750px;
    margin: 40px auto;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.12);
}

h1, h2 {
    text-align: center;
}

form {
    display: grid;
    gap: 12px;
    margin: 20px 0;
}

input {
    padding: 10px;
    font-size: 16px;
}

button, .button-link {
    background: #2457d6;
    color: white;
    border: none;
    padding: 11px 15px;
    text-decoration: none;
    border-radius: 6px;
    cursor: pointer;
    text-align: center;
}

button:hover, .button-link:hover {
    background: #183d99;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
}

th {
    background: #eee;
}

.message {
    color: #0a7a28;
    font-weight: bold;
    text-align: center;
}

.error, .delete {
    color: #c62828;
    font-weight: bold;
}