body{
    font-family: Arial;
    background-color: #f2f2f2;
    margin: 0;
    padding: 0;
}

/* ===== HEADER ===== */

header{
    background-color: #003566;
    color: white;
    text-align: center;
    padding: 20px;
}

/* ===== MENU ===== */

nav{
    background-color: #00509d;
    padding: 15px;
    text-align: center;
}

nav a{
    color: white;
    text-decoration: none;
    margin: 15px;
    font-weight: bold;
}

nav a:hover{
    color: yellow;
}

/* ===== PAGINA PRINCIPAL ===== */

.principal{
    text-align: center;
    margin-top: 20px;
}

.principal img{
    border-radius: 10px;
}

/* ===== TABLA ===== */

table{
    width: 80%;
    margin: auto;
    margin-top: 20px;
    border-collapse: #00509d;
    background-color: white;
}

th{
    background-color: #00509d;
    color: white;
}

td, th{
    border: 1px solid black;
    padding: 10px;
    text-align: center;
}

/* ===== PAGINA LECCIONES ===== */

.contenedor{
    display: flex;
    margin: 20px;
    gap: 20px;
}

.contenido{
    width: 70%;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px gray;
}

.contenido h2{
    color: navy;
}

.lateral{
    width: 30%;
    background-color: lightgray;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px gray;
}

.lateral h3{
    color: navy;
}

.lateral img{
    width: 100%;
    border-radius: 10px;
    margin-top: 10px;
}

/* ===== PAGINA EJERCICIOS ===== */

.ejercicios{
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    padding: 20px;
    box-sizing: border-box;
}

.caja{
    width: 33%;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px gray;
}

.caja h2{
    background-color: #00509d;
    color: white;
    text-align: center;
    padding: 10px;
    border-radius: 5px;
}

.caja h3{
    color: navy;
    margin-top: 20px;
}

.caja p{
    margin: 10px 0;
    line-height: 1.5;
}

/* ===== PAGINA VIDEOS ===== */

.videos{
    margin: 20px;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px gray;
}

.videos h2{
    color: navy;
}

/* ===== PAGINA CONTACTOS ===== */

.contactos{
    width: 70%;
    margin: auto;
    margin-top: 20px;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px gray;
}

.contactos h2{
    color: navy;
}

/* ===== FOOTER ===== */

footer{
    background-color: #00509d;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 20px;
}
.ejercicios{
    display: flex;
    width: 100%;
    gap: 20px;
    padding: 20px;
    box-sizing: border-box;
}

.caja{
    flex: 1;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px gray;
}

.caja h2{
    background-color: navy;
    color: white;
    text-align: center;
    padding: 10px;
    border-radius: 5px;
}