/* Color scheme */
:root {
--primary-color: #0066ff;
--secondary-color: #ff4d4d;
--tertiary-color: #4d4d4d;
--background-color: #f2f2f2;
--text-color: #333333;
}

/* Global styles */
body {
font-family: Arial, sans-serif;
font-size: 16px;
line-height: 1.5;
margin: 0;
padding: 0;
background-color: var(--background-color);
color: var(--text-color);
}

h1, h2 {
font-weight: bold;
}

header {
background-color: var(--primary-color);
color: #fff;
padding: 20px;
}

nav ul {
margin: 0;
padding: 0;
list-style: none;
}

nav ul li {
display: inline-block;
margin-right: 20px;
}

nav ul li a {
color: #fff;
text-decoration: none;
}

nav ul li a:hover {
color: var(--secondary-color);
}

main {
display: flex;
flex-wrap: wrap;
}

section {
flex: 2;
padding: 20px;
}

article {
margin-bottom: 40px;
}

aside {
flex: 1;
background-color: var(--tertiary-color);
padding: 20px;
color: #fff;
}

aside ul {
margin: 0;
padding: 0;
list-style: none;
}

aside ul li {
margin-bottom: 10px;
}

aside ul li a {
color: #fff;
text-decoration: none;
}

footer {
background-color: var(--primary-color);
color: #fff;
text-align: center;
padding: 20px;
}

footer p {
margin: 0;
padding: 0;
}

@media only screen and (max-width: 600px) {
main {
flex-direction: column;
}

aside {
order: -1;
}