body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}

h1, h2 {
    text-align: center;
    margin: 1rem 0;
}

table {
    width: 95%;
    max-width: 900px;
    margin: 1rem auto;
    border-collapse: collapse;
    font-size: 0.95rem;
}

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

th {
    background-color: #4CAF50;
    color: white;
}

.paid {
    color: green;
    font-weight: bold;
}
.not-paid {
    color: red;
    font-weight: bold;
}

a {
    color: #007BFF;
    text-decoration: none;
}

.logout, .whatsapp-buttons {
    text-align: center;
    margin: 1rem;
}

@media screen and (max-width: 600px) {
    table, thead, tbody, th, td, tr {
        display: block;
    }

    thead tr {
        display: none;
    }

    tr {
        margin-bottom: 1rem;
        border: 1px solid #ccc;
        padding: 10px;
    }

    td {
        text-align: left;
        padding-left: 50%;
        position: relative;
    }

    td::before {
        content: attr(data-label);
        position: absolute;
        left: 10px;
        width: 45%;
        font-weight: bold;
        white-space: nowrap;
    }
}