body {
    font-family: Arial, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 800px;
}

.card {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.tab {
    overflow: hidden;
    border-bottom: 1px solid #ccc;
    margin-bottom: 20px;
}

.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
    font-size: 17px;
}

.tab button:hover {
    background-color: #ddd;
}

.tab button.active {
    background-color: #ccc;
}

.tabcontent {
    display: none;
}

h1, h2, h3 {
    color: #333;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-top: 10px;
    font-weight: bold;
}

input[type="text"], input[type="number"], input[type="password"], input[type="date"] {
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    margin-top: 20px;
    padding: 10px 15px;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: #0056b3;
}

.result {
    margin-top: 20px;
    padding: 10px;
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.error {
    color: red;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 8px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
}