body {

    font-family: 'Poppins', sans-serif;

    margin: 0;

    background-color: #f5f7fa;

    color: #333;

}

/* Chrome, Safari, Edge, Opera */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox */
input[type=number] {
  -moz-appearance: textfield;
}

header {

    /*background-color: #3b5998;*/ 
    background-image: ("img/uVsColo.jpg");
    background-size: cover;
    color: white;

    padding: 40px 20px;

    text-align: center;

    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);

}



nav {

    background-color: #ffffff;

    border-bottom: 1px solid #ddd;

    text-align: center;

    padding: 15px 0;

    position: sticky;

    top: 0;

    z-index: 1000;

}



nav a {

    color: #3b5998;

    margin: 0 18px;

    text-decoration: none;

    font-weight: 500;

    font-size: 17px;

    transition: color 0.3s ease;

}



nav a:hover {

    color: #cfcfcf;

    transition: color 0.5s ease, color 0.5s ease;

}



.contenedor {

    padding: 40px 20px;

    max-width: 1000px;

    margin: auto;

}

.contenedor h3{

    text-align: center;

}



img.destacada {

    width: 100%;

    height: auto;

    border-radius: 10px;

    box-shadow: 0 4px 12px rgba(0,0,0,0.08);

    transition: transform 0.3s;

}



img.destacada:hover {

    transform: scale(1.01);

}



table {

    width: 100%;

    border-collapse: separate;

    border-spacing: 0;

    margin-top: 35px;

    background-color: #ffffff;

    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);

    border-radius: 8px;

    overflow: hidden;

}



th, td {

    border-bottom: 1px solid #e0e0e0;

    padding: 14px;

    text-align: center;

}



th {

    background-color: #688cdb;

    color: #333;

    font-weight: 600;

}



tr:last-child td {

    border-bottom: none;

}



tr:nth-child(even) {

    background-color: #fafafa;

}



.video-container {

    margin: 35px 0;

    position: relative;

    padding-bottom: 56.25%;

    height: 0;

    overflow: hidden;

    border-radius: 10px;

    box-shadow: 0 4px 12px rgba(0,0,0,0.08);

}



.video-container iframe {

    position: absolute;

    top: 0;

    left: 0;

    width: 100%;

    height: 100%;

    border: none;

}