html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

body {
    background-image: url("Goticas.jpeg");
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #1a2c42;
    color: beige;
    text-align: center;
    padding: 25px;
    margin: 0;
    border: none;
}

nav {
    background-color: #7acedb;
    text-align: center;
    padding: 15px;
    margin: 0;
    border: none;
}

nav a {
    color: #0f1a29;
    text-decoration: none;
    margin: 0 15px;
    font-size: 18px;
}

nav a:hover {
    color: #000000;
    text-decoration: underline;
}

nav strong, nav span {
    color: #0f1a29;
}

.menu-practicas {
    position: relative;
    display: inline-block;
    vertical-align: top;
    color: #0f1a29;
}

.submenu {
    display: none;
    position: absolute;
    left: 0;
    top: 100%;
    background-color: #1a2c42;
    border: none;
    min-width: 220px;
    padding: 10px;
    z-index: 999;
    margin-top: 0;
}

.menu-practicas:hover .submenu {
    display: block;
}

.submenu a {
    display: block;
    margin: 8px 0;
    text-decoration: none;
    color: #d4e3f7;
    padding: 5px 10px;
}

.submenu a:hover {
    background-color: #274060;
    color: #ffffff;
    border-radius: 4px;
}

main {
    flex: 1;
    max-width: 900px;
    margin: 30px auto;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
}

section {
    background-color: rgba(185, 236, 246, 0.9);
    padding: 20px;
    border-radius: 10px;
    border: none;
}

footer {
    background-color: #1a2c42;
    color: white;
    text-align: center;
    padding: 15px;
    margin: 0;
    border: none;
    flex-shrink: 0;
}