/* Default styles for both orientations */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header {
    background-color: #333;
    color: #fff;
    padding: 1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
header h1 {
    margin: 0;
}
nav button {
    background-color: #555;
    color: #fff;
    border: none;
    padding: 0.5em 1em;
    margin: 0 0.5em;
    cursor: pointer;
}
nav button:hover {
    background-color: #777;
}
main {
    padding: 1em;
}
footer, aside {
    background-color: #333;
    color: #fff;
    padding: 1em;
    text-align: center;
}
footer {
    position: fixed;
    bottom: 0;
    width: 100%;
}
aside {
    position: fixed;
    right: 0;
    top: 0;
    height: 100%;
    width: 20%;
}
aside button {
    background-color: #555;
    color: #fff;
    border: none;
    padding: 0.5em 1em;
    margin: 0.5em 0;
    cursor: pointer;
}
aside button:hover {
    background-color: #777;
}

/* Horizontal styles */
@media (orientation: landscape) {
    footer {
        display: none;
    }
    aside {
        display: block;
    }
}

/* Vertical styles */
@media (orientation: portrait) {
    aside {
        display: none;
    }
    footer {
        display: block;
    }
}