body{
    font-family: Arial;
    background: linear-gradient(to right, #dbeafe, #eff6ff);
    margin: 0;
    padding: 0;
}

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

header{
    background-color: #003566;
    color: white;
    text-align: center;
    padding: 25px;
}

header h1{
    margin: 0;
    font-size: 40px;
}

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

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

nav a{
    color: white;
    text-decoration: none;
    margin: 15px;
    font-weight: bold;
    font-size: 18px;
    transition: 0.3s;
}

nav a:hover{
    color: #ffd60a;
}

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

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

.principal img{
    border-radius: 15px;
    box-shadow: 2px 2px 10px gray;
}

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

table{
    width: 80%;
    margin: auto;
    margin-top: 20px;
    border-collapse: collapse;
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
}

th{
    background-color: #003566;
    color: white;
}

td, th{
    border: 1px solid #ccc;
    padding: 12px;
    text-align: center;
}

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

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

.contenido{
    width: 70%;
    background-color: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 2px 2px 10px gray;
}

.contenido h2{
    color: #003566;
}

.lateral{
    width: 30%;
    background-color: #dbeafe;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 2px 2px 10px gray;
}

.lateral h3{
    color: #003566;
}

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

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

.ejercicios{
    display: flex;
    justify-content: center;
    gap: 25px;
    padding: 30px;
    flex-wrap: wrap;
}

.caja{
    flex: 1;
    min-width: 280px;
    max-width: 350px;

    background-color: white;
    padding: 20px;
    border-radius: 20px;

    box-shadow: 2px 2px 15px gray;

    transition: transform 0.3s;
}

.caja:hover{
    transform: scale(1.03);
}

.caja h2{
    background-color: #003566;
    color: white;
    text-align: center;
    padding: 12px;
    border-radius: 10px;
}

.caja p{
    margin: 15px 0;
    line-height: 1.6;
    font-size: 17px;
}

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

.videos{
    margin: 20px;
    background-color: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 2px 2px 10px gray;
}

.videos h2{
    color: #003566;
}

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

.contactos{
    width: 70%;
    margin: auto;
    margin-top: 20px;
    background-color: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 2px 2px 10px gray;
}

.contactos h2{
    color: #003566;
}

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

footer{
    background-color: #003566;
    color: white;
    text-align: center;
    padding: 18px;
    margin-top: 20px;
    font-size: 18px;
}