/* Global variables. */
:root {
  /* Set sans-serif & mono fonts */
  --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir,
    "Nimbus Sans L", Roboto, Noto, "Segoe UI", Arial, Helvetica,
    "Helvetica Neue", sans-serif;
  --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;

  /* Default (light) theme */
  --bg: #fff;
  --accent-bg: #f5f7ff;
  --text: #333;
  --text-light: #585858;
  --border: #d8dae1;
  --accent: #0d47a1;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #212121;
    --accent-bg: #2b2b2b;
    --text: #dcdcdc;
    --text-light: #ababab;
    --border: #666;
    --accent: #ffb300;
  }
}

* {
  box-sizing: border-box;
}

html {
  /* Set the font globally */
  font-family: var(--sans-font);
  scroll-behavior: smooth;
}

/* Make the body a nice central block */
body {
  color: var(--text);
  background: var(--bg);
  font-size: 1.15rem;
  line-height: 1.5;
  margin: 0 auto;
  max-width: 40em;
  padding: 0 1em;
}

body > header {
  text-align: center;
  padding: 0 0.5rem 2rem 0.5rem;
  box-sizing: border-box;
}

body > header h1 {
  max-width: 100%;
  margin: 1rem auto;
}

/* Format navigation */
nav {
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
  line-height: 2;
  padding: 1rem 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding-bottom: 2rem;
}

nav a {
  margin: 1rem 1rem 0 0;
  color: var(--text) !important;
  padding: 0.1rem 1rem;
}

nav a:hover {
  color: var(--accent) !important;
}

nav a:last-child {
  margin-right: 0;
}

/* Reduce nav side on mobile */
@media only screen and (max-width: 750px) {
  nav a {
    border: none;
    padding: 0;
    color: var(--accent);
    text-decoration: underline;
    line-height: 1;
  }
}

/* Add a little padding to ensure spacing is correct between content and nav */
main {
  padding-top: 1.5rem;
}

body > footer {
  margin-top: 4rem;
  padding: 2rem 1rem 1.5rem 1rem;
  color: var(--text-light);
  font-size: 0.9rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

/* Format headers */

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.6rem;
  margin-top: 3rem;
}

/* Reduce header size on mobile */
@media only screen and (max-width: 720px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2.1rem;
  }
}

/* Format links */
a,
a:visited {
  color: var(--accent);
}

a:hover {
  text-decoration: none;
}