:root {
  --color-bg: #fff;
  --color-bg-secondary: #e9e9e9;
  --color-text: #000;
  --color-text-secondary: #999;
  --font-family: "Segoe UI", Roboto, Oxygen-Sans, Cantarell, "Helvetica Neue", sans-serif;
  --width-content: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root[color-mode="user"] {
    --color-bg: #333;
    --color-bg-secondary: #555;
    --color-text: #f7f7f7;
    --color-text-secondary: #aaa;
  }
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-family);
  line-height: 1.5;
  max-width: var(--width-content);
  margin: 0 auto;
  overflow-x: hidden;
  padding: 0;
}

/* Links */
a {
  text-decoration: none;
}

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

/* Navigation bar */
nav {
  color: white;
  background-color: #333;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

nav h1 {
  margin: 0;
  padding: 0 1rem;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: right;
}

nav ul li a {
  padding: 0.3rem 0.8rem;
  gap: 0.3rem;
  font-size: large;
}

nav ul li.active a {
  color: #aaeeff;
  text-decoration: none;
}

nav ul li a:hover {
  text-decoration: underline;
}

/* Mobile responsive */
@media screen and (max-width: 700px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }
  
  nav ul {
    flex-direction: column;
    gap: 0rem;
    margin-top: 1rem;
    margin-left: 0.5rem;
  }
  
  nav ul li a {
    padding: 0.1rem 0.5rem;
  }
}

main {
  padding: 1rem;
}

footer {
  padding: 0rem 1rem;
  padding-bottom: 0.5rem;
}