body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    background: #ffffff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    text-align: center;
}

h2, h3 {
    color: #1c1e21;
    margin-bottom: 1.5rem;
}

input[type="text"],
input[type="number"],
input[type="password"] {
    width: calc(100% - 22px);
    padding: 12px;
    margin-bottom: 1rem;
    border: 1px solid #dddfe2;
    border-radius: 6px;
    font-size: 1rem;
}

input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

ul {
    list-style-type: none;
    padding: 0;
    text-align: left;
}

li {
    background: #f9f9f9;
    margin-bottom: 8px;
    padding: 12px;
    border-radius: 4px;
    border: 1px solid #eee;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    text-align: left;
}

th, td {
    padding: 12px;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f7f7f7;
    font-weight: 600;
}