* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f4f6f9;
    color: #212529;
}

.header {
    background: linear-gradient(135deg, #212529, #343a40);
    color: white;
    padding: 50px 20px;
    text-align: center;
}

.header h1 {
    margin: 0 0 10px;
    font-size: 38px;
    font-weight: bold;
}

.header p {
    margin: 0;
    color: #ced4da;
    font-size: 17px;
}

.contenedor {
    max-width: 1100px;
    margin-top: 40px;
    margin-bottom: 40px;
}

.card-principal {
    background-color: white;
    border-radius: 15px;
    padding: 30px;

    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.encabezado-tabla {
    display: flex;
    justify-content: space-between;
    align-items: center;

    gap: 20px;
    margin-bottom: 25px;
}

.encabezado-tabla h2 {
    margin: 0 0 5px;
    font-size: 26px;
    font-weight: bold;
}

.encabezado-tabla p {
    margin: 0;
    color: #6c757d;
}

.buscador-contenedor {
    width: 300px;
}

.buscador-contenedor input {
    border-radius: 8px;
    padding: 10px 14px;
    border: 1px solid #ced4da;
}

.buscador-contenedor input:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
}

.table {
    margin-bottom: 0;
}

.table thead {
    background-color: #212529;
    color: white;
}

.table thead th {
    padding: 15px;
    border: none;
}

.table tbody td {
    padding: 14px 15px;
    vertical-align: middle;
}

.table tbody tr {
    transition: 0.2s;
}

.table tbody tr:hover {
    background-color: #f1f5f9;
}

.btn-acceder {
    display: inline-block;

    background-color: #0d6efd;
    color: white;

    text-decoration: none;

    padding: 8px 18px;

    border-radius: 8px;

    font-size: 14px;
    font-weight: bold;

    transition: 0.2s;
}

.btn-acceder:hover {
    background-color: #0b5ed7;
    color: white;

    transform: translateY(-2px);

    box-shadow: 0 4px 10px rgba(13, 110, 253, 0.25);
}


/* ==============================
   PIE DE PÁGINA
================================= */

footer {
    text-align: center;

    padding: 25px;

    color: #6c757d;
    font-size: 14px;
}
@media (max-width: 768px) {

    .header {
        padding: 35px 15px;
    }

    .header h1 {
        font-size: 30px;
    }

    .header p {
        font-size: 15px;
    }

    .card-principal {
        padding: 20px;
    }

    .encabezado-tabla {
        flex-direction: column;
        align-items: stretch;
    }

    .buscador-contenedor {
        width: 100%;
    }

    .table {
        font-size: 14px;
    }

    .btn-acceder {
        padding: 7px 12px;
    }
}