body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background: linear-gradient(120deg, #f4f4f4, #eaeaea);
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.directory {
    width: 90%;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-top: 20px;
}

.header {
    background: #003f5c;
    color: #fff;
    text-align: center;
    padding: 15px;
    font-size: 24px;
    font-weight: bold;
}

.table {
    display: flex;
    flex-wrap: wrap;
    padding: 20px;
    justify-content: center;
}

.column {
    flex: 1;
    min-width: 250px;
    max-width: 450px;
    margin: 10px;
    padding: 15px;
    border-radius: 8px;
    background: #f7f7f7;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.column-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
    text-align: center;
    color: #003f5c;
}

.phone-number {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 15px;
    text-align: center;
    color: #58508d;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

li {
    margin-bottom: 8px;
    padding: 8px 10px;
    border-radius: 5px;
    background: #eef2f3;
    transition: background 0.3s ease;
}

li:hover {
    background: #d4ebf2;
}

@media (max-width: 768px) {
    .table {
        flex-direction: column;
        align-items: center;
    }
}