header,
main,
footer {
    width: 1000px;
    margin: 0 auto;
}

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

body {
    font-family: 'Roboto', sans-serif;
}

header,
.grid,
footer {
    max-width: 840px;
    margin: 0 auto;
}

nav {
    background-color: steelblue;
    padding: 1rem;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}

nav a {
    display: block;
    padding: 0.5rem;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
}

nav a:hover {
    background-color: #0056b3;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

h1 {
    border-bottom: 3px solid steelblue;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.grid {
    display: grid;
    align-items: start;
    gap: 20px;
    margin: 20px auto;
    padding: 0 20px;
}

main {
    grid-column: 2/3;
    margin: 1rem;
    text-align: justify;
}

main img {
    width: 150px;
    height: auto;
    float: right;
    margin-left: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

aside {
    width: 20rem;
    position: relative;
    grid-column: 1/2;
    grid-row: 1/2;
    background-color: #f4f4f4;
    padding: 1rem;
    border-radius: 8px;
    text-align: justify;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

aside img {
    width: 200px;
    height: auto;
    margin-bottom: 15px;
    border-radius: 8px;
}

aside h2 {
    margin-bottom: 10px;
    color: steelblue;
}

footer {
    margin-top: 20px;
    padding: 20px;
    text-align: center;
    border-top: 1px solid #ddd;
    background-color: #f9f9f9;
}

.box {
    margin: 1rem 0;
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 8px;
    border: 1px solid #ddd;
}

.indent {
    padding-left: 2rem;
}

ul.box li {
    margin-bottom: 10px;
}

ul.box a {
    color: steelblue;
    text-decoration: none;
}

ul.box a:hover {
    text-decoration: underline;
    color: #0056b3;
}

@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    aside {
        width: 100%;
        grid-column: 1/2;
    }

    main {
        grid-column: 1/2;
    }

    nav {
        flex-direction: column;
        gap: 10px;
    }

    nav a {
        width: 100%;
        text-align: center;
    }
}