* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}
body {
    background: #f4f4f4;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background: #007bff;
    color: white;
}
.btn:hover {
    background: #0056b3;
}
.error {
    color: red;
    margin-top: 10px;
}
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 5px;
    overflow: hidden;
}
.table th, .table td {
    padding: 10px;
    border-bottom: 1px solid #ddd;
    text-align: left;
}
.table th {
    background: #f8f9fa;
}
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
}