:root {
  --color-background: #000000;
  --color-foreground: #ffffff;

  --space-page: 20px;
  --space-footer-bottom: 10px;
  --space-information-gap: 20px;
  --space-information-link-gap: 10px;

  --font-primary: Helvetica, Arial, sans-serif;
  --font-monospace: "Courier New", Courier, monospace;

  --font-size-message: 30px;
  --font-size-information-toggle: 30px;
  --font-size-information-link: 15px;
  --font-size-footer: 12.5px;

  --duration-information-toggle: 0.5s;
  --duration-information-link: 0.5s;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  font-family: var(--font-primary);
  color: var(--color-foreground);
  background: var(--color-background);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

a {
  color: inherit;
}

button {
  font: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  white-space: nowrap;
  border: 0;
  clip: rect(0, 0, 0, 0);
}

.site-main {
  min-height: 100vh;
  min-height: 100svh;
}

.message {
  position: fixed;
  top: var(--space-page);
  right: var(--space-page);
  left: var(--space-page);
  margin: 0;
  overflow-wrap: break-word;
  font-family: var(--font-monospace);
  font-size: var(--font-size-message);
}

.message__item {
  display: none;
}

.message__cursor {
  animation: message-cursor-blink 1s infinite;
}

.no-js [data-message-no-js] {
  display: inline;
}

.information {
  position: fixed;
  top: 50%;
  right: var(--space-page);
  display: flex;
  align-items: center;
  gap: var(--space-information-gap);
  transform: translateY(-50%);
}

.information__links {
  --information-link-max-delay: 0ms;

  display: flex;
  flex-direction: column;
  gap: var(--space-information-link-gap);
  text-align: right;
  visibility: hidden;
  transition:
    visibility 0s linear
      calc(var(--information-link-max-delay) + var(--duration-information-link));
}

.information__links.is-open {
  visibility: visible;
  transition-delay: 0ms;
}

.information__link {
  --information-link-delay: 0ms;

  opacity: 0;
  transform: translateX(20px);
  transition:
    opacity var(--duration-information-link) ease var(--information-link-delay),
    transform var(--duration-information-link) ease var(--information-link-delay);
  font-size: var(--font-size-information-link);
  text-decoration: none;
}

.information__links.is-open .information__link {
  opacity: 1;
  transform: translateX(0);
}

.information__link:hover {
  text-decoration: underline;
}

.information__link:focus-visible,
.information__toggle:focus-visible {
  outline: 1px solid var(--color-foreground);
  outline-offset: 5px;
}

.information__toggle {
  padding: 0;
  font-size: var(--font-size-information-toggle);
  color: var(--color-foreground);
  cursor: pointer;
  background: none;
  border: 0;
  transition: transform var(--duration-information-toggle) ease;
}

.information__toggle.is-open {
  transform: rotate(135deg);
}

.no-js .information__links {
  visibility: visible;
  transition: none;
}

.no-js .information__link {
  opacity: 1;
  transform: none;
  transition: none;
}

.no-js .information__toggle {
  display: none;
}

.site-footer {
  position: fixed;
  right: var(--space-page);
  bottom: var(--space-footer-bottom);
  left: var(--space-page);
  font-size: var(--font-size-footer);
  text-align: center;
  white-space: nowrap;
}

.site-footer__text {
  margin: 0;
}

@keyframes message-cursor-blink {
  0%,
  50% {
    opacity: 1;
  }

  51%,
  100% {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .information__links,
  .information__link,
  .information__toggle {
    transition: none;
  }
}