*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    background-color: #FFFFFF;
    color: #212121;
    font-family: 'Lucida Sans', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

#contenedor{
    width: 960px;
    margin: auto;
    margin-top: 20px;
    margin-bottom: 20px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
}

header{
    background: #4CAF50;
    height: 150px;
    display: flex;
    justify-content: center;
    align-items: center;
}

nav{
    background: #FF9800;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}

nav h2{
    font-size: 30px;
    color: white;
}

/* CONTENIDO */
#contenido{
    background: #FFFFFF;
    width: 700px;
    float: left;
    margin-top: 10px;
    margin-right: 10px;
    padding: 10px;
}

#contenido h2{
    display: none;
}

/* Fila con dos videos verticales */
.fila-videos{
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

/* Tarjetas de video */
.video-card{
    flex: 1;
    margin: 0 10px;
    text-align: center;
}

.video-card iframe{
    width: 100%;
    max-width: 300px;
    aspect-ratio: 9/16;
    border-radius: 10px;
    border: 2px solid #E0E0E0;
    background: #000;
}

/* Video horizontal grande */
.video-card.grande iframe{
    max-width: 100%;
    aspect-ratio: 16/9;
}

/* Texto debajo de cada video */
.video-card h3{
    margin-top: 8px;
    font-size: 18px;
    color: #4CAF50;
}

.video-card p{
    font-size: 14px;
    color: #333;
}

/* ASIDE */
aside{
    width: 220px;
    background: #F5F5F5;
    margin-top: 20px;
    float: right;
    padding: 15px;
    border-left: 2px solid #E0E0E0;
}

aside h2{
    font-size: 20px;
    color: #4CAF50;
    margin-bottom: 10px;
}

/* FOOTER */
footer{
    background: #212121;
    clear: both;
    padding: 20px;
    text-align: center;
}

footer h2{
    font-size: 20px;
    color: white;
    font-style: italic;
    margin-bottom: 10px;
}

footer a{
    color: #FF9800;
    text-decoration: none;
}

footer a:hover{
    text-decoration: underline;
}