:root {
  --background: #ffffff;
  --foreground: #171717;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0a0a0a;
    --foreground: #ededed;
  }
}

html {
  height: 100%;
}

html,
body {
  max-width: 100vw;
  overflow-x: hidden;
}

body {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  color: var(--foreground);
  background: var(--background);
  font-family: Arial, Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: underline;
}

a:hover,
a:focus,
a.active {
  background-color: var(--foreground);
  color: var(--background);
}

@media (prefers-color-scheme: dark) {
  html {
    color-scheme: dark;
  }
}

main {
  padding: 0 0.5em;
}

main a {
  text-decoration: underline;
}

main h1 {
  margin: 0.5em 0;
}

main h2 {
  margin: 0.5em 0;
}

main p {
  margin: 0.5em 0;
}

main ul {
  padding-left: 1em;
}

.page {
  --background: black;
  --foreground: green;

  background-color: var(--background);
  color: var(--foreground);
  font-family: Courier, monospace;
  max-width: 50em;
  margin: 0 auto;
}

.header {
  display: flex;
  justify-content: center;
  margin-bottom: 1em;
}

.header-text {
  display: inline-block;
  margin: 0;
  white-space: pre-wrap;
}

@media (max-width: 600px) {
  .header-text {
    font-size: 0.9em;
  }
}

@media (max-width: 550px) {
  .header-text {
    font-size: 0.7em;
  }
}

@media (max-width: 413px) {
  .header-text {
    font-size: 0.6em;
  }
}

@media (max-width: 359px) {
  .header-text {
    font-size: 0.4em;
  }
}

.navigation {
  display: flex;
  justify-content: center;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.item {
  flex-grow: 1;
  text-align: center;
}

.link {
  border: 1px solid var(--foreground);
  display: block;
  padding: 1em;
  text-decoration: none;
  word-break: break-all;
}

.active {
  background-color: var(--foreground);
  color: var(--background);
}

.links {
  list-style-type: none;
  padding: 0;
}

.links li {
  margin: 1em 0;
}

.links li a {
  border: 1px solid var(--foreground);
  display: block;
  padding: 1em;
  text-decoration: none;
  word-break: break-all;
}

.highlight {
  border: 3px double var(--foreground);
  margin: 2em 1em;
  padding: 1em 1em 0.5em;
}