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

html, body {
    height: 100%;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    flex-direction: column;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}

main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 100px 20px;
}

nav {
    background-color: #444;
    padding: 15px 20px;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    flex-wrap: wrap;
}

nav li {
    margin: 0 15px;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #ffd700;
}

img.imagen-principal {
    width: 100%;
    max-width: 600px;
    height: auto;
    margin: 20px auto;
    display: block;
    border-radius: 8px;
}

h2 {
    text-align: center;
    margin: 20px 0;
    color: #333;
}

h3 {
    margin-top: 20px;
    margin-bottom: 15px;
    color: #444;
}

p {
    line-height: 1.6;
    margin-bottom: 15px;
}

section {
    margin-bottom: 30px;
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section ul {
    margin-left: 20px;
}

section li {
    margin-bottom: 10px;
}

article {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

article ul {
    margin-left: 20px;
}

article li {
    margin-bottom: 10px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: auto;
    width: 100%;
}

/* Estilos para tabla */
.tabla {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
    margin: 20px 0;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.tabla thead {
    background-color: #333;
    color: #fff;
}

.tabla th, .tabla td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.tabla tbody tr:hover {
    background-color: #f5f5f5;
}

.tabla tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

.caja {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    margin: 0 auto;
}

/* Media queries para dispositivos móviles */
@media (max-width: 768px) {
    main {
        padding: 30px 15px 100px 15px;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav li {
        margin: 8px 0;
    }
    
    img.imagen-principal {
        max-width: 100%;
    }
    
    section, article {
        padding: 15px;
    }
    
    h2 {
        font-size: 1.5em;
    }
    
    h3 {
        font-size: 1.2em;
    }
}

.caja label {
    display: block;
    margin-top: 15px;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.caja input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.caja input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

/* Estilos para botones */
.submit {
    background-color: #007bff;
    color: #fff;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    margin: 5px;
}

.submit:hover {
    background-color: #0056b3;
}

.submit:active {
    background-color: #004085;
}

/* Estilos para header y menu */
.header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    margin-bottom: 20px;
}

.header h1 {
    margin-bottom: 10px;
}

.menu ul {
    list-style: none;
    display: flex;
    justify-content: center;
}

.menu li {
    margin: 0 15px;
}

.menu a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s;
}

.menu a:hover {
    color: #007bff;
}

/* Estilos generales para página */
.page-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.tablita {
    overflow-x: auto;
}

.footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: 50px;
}

.social {
    display: inline-block;
    margin: 0 10px;
    width: 30px;
    height: 30px;
    background-color: #555;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.social:hover {
    background-color: #777;
}