:root {
  --header-bg-color: #1b1c1d;
  --header-fg-color: #a3bd8d;
  --header-height: 192px;
  --header-height-small: calc(var(--header-height) * .25);
  --header-height-multiplier: .25;
  --page-bg-color: #232425;
  --page-fg-color: #7e9fbe;
  --page-link-color: #aabbee;
  --menu-bg-color: #000;
  --highlight-fg-color: #eacb8b;
  --emboss-color: #000;
}

@font-face {
  font-family: 'rubikregular';
  src: url('/rubik-regular-minimal.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

@media (prefers-color-scheme: light) {
  :root {
    --page-bg-color: #efe9d9;
    --page-fg-color: #261b00;
    --menu-bg-color: #fff;
    --header-fg-color: #143373;
    --header-bg-color: #a49570;
    --emboss-color: #fff;
  }

  .light\:invert,
  .contacts img {
    filter: invert();
  }
}

* {
  transition: color 300ms ease, background-color 300ms ease, fill 500ms ease;
}

html,
body {
  width: 100vw;
  display: flex;
  flex-flow: column nowrap;
  justify-content: center;
  margin: auto;
  background: var(--page-bg-color);
  color: var(--page-fg-color);
  font-size: 20px;
  font-family: 'rubikregular', sans-serif;
  scroll-behavior: smooth;
}

#main-menu {
  position: fixed;
  top: var(--header-height);
  width: 100vw;
  background-color: var(--menu-bg-color);
  transition: top .3s ease-in-out, background-color 1s ease-in;
}

#main-menu>menu {
  width: 960px;
  max-width: 98%;
  height: 1.2rem;
  margin: 0 auto 0;
  padding: 0;
  display: flex;
  justify-content: space-around;
  align-items: center;
  list-style: circle;
}
#main-menu > li {
  padding: 0;
}
body>header.small + #main-menu {
  top: var(--header-height-small);
  background-color: var(--header-bg-color);
}
body>header.small + #main-menu>menu {
  padding: .5rem 0;
}
pre {
  background: var(--emboss-color);
  padding: .5rem;
}
li.active>a {
  color: var(--highlight-fg-color);
  font-weight: bold;
}

body>#spacer,
body>header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  background-color: var(--header-bg-color);
}

body>#spacer {
  height: var(--header-height-small);
}

body>header, body>header>a {
  height: var(--header-height);
  color: transparent;
  transition: transform .3s ease-in-out;
  transform-origin: top center;
}

body>header.small {
  transform: scale(var(--header-height-multiplier));
}

body>header svg {
  display: block;
  width: 960px;
  max-width: 98vw;
  margin: .5em auto;
  color: var(--header-fg-color);
}

body>main {
  width: 960px;
  max-width: 98vw;
  margin: var(--header-height) auto 4rem;
}

body>main>header {
  display: block;
  padding: 2em 0;
}

a {
  color: var(--page-link-color);
}

blockquote {
  margin: 0;
  padding: .5em .5em .5em 1em;
  background-color: rgba(128, 128, 128, .1);
  border-radius: 12px;
}

code {
  background-color: var(--emboss-color);
}

#intro {
  display: flex;
  flex-flow: column nowrap;
  min-height: calc(100vh - var(--header-height));
  margin: 2rem 0;
}

#content {
  padding-top: 2rem;
}
#content>h1,
main > header > h1 {
  margin: 0 0 .25em;
  font-size: 2rem;
  font-variant: small-caps;
  text-shadow: 1px 1px 0 var(--emboss-color);
  color: var(--header-fg-color);
}
#content>h1 {
  padding-top: 2em;
}
h2 {
  color: var(--highlight-fg-color);
}

#cta {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

#cta>a {
  width: 450px;
  padding: 2rem .5rem 0;
  display: flex;
  flex-flow: column nowrap;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  font-variant: small-caps;
  font-size: 2rem;
  text-align: center;
  background-color: rgba(128, 128, 128, .1);
  transition: background-color .3s ease;
  border-radius: 12px;
}

#cta>a:hover {
  background-color: rgba(128, 128, 128, .2);
}

#cta>a>svg {
  display: block;
  max-width: 200px;
  opacity: .3;
  transition: opacity .3s ease;
}

#cta>a:hover>svg {
  opacity: .8;
}

.contacts {
  margin: 1.5em 0;
  columns: 3;
  column-fill: balance;
}

.contacts p {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0 0 1em 0;
}

.contacts img {
  width: 3rem;
}

#header-tilde,
#header-bracket,
#header-underscore {
  fill: var(--highlight-fg-color);
}

#header-k,
#header-o,
#header-e,
#header-h,
#header-r {
  fill: var(--header-fg-color);
}

#header-underscore {
  animation: fade 2s linear infinite;
}

hr {
  display: block;
  border: none;
  width: 100%;
  height: 1px;
  margin: 2rem 0;
  background-color: var(--emboss-color);
}

span[title] {
  text-decoration: underline wavy gray;
}

@keyframes fade {
  0% {
    opacity: 1.0;
  }

  50% {
    opacity: 0.0;
  }

  60% {
    opacity: 0.0;
  }

  80% {
    opacity: 1.0;
  }

  100% {
    opacity: 1.0;
  }
}

@media (max-width: 980px) {
  :root {
    --header-height: calc(100vw * 0.17);
    --header-height-small: 48px;
  }
  #cta>a {
    width: 100%;
  }
  .contacts {
    columns: 2;
  }
}

@media (max-width: 480px) {
  body>header.small {
    transform: none;
  }
  body>header.small + #main-menu {
    top: var(--header-height);
  }
  #main-menu>menu {
    height: 2.4rem;
    margin-left: 1.5rem;
    padding: .5rem 0;
    flex-flow: column wrap;
    align-items: flex-start;
  }
  body>main {
    margin: calc(var(--header-height) + 2rem) auto 4rem;
  }
  #content > h1 {
    padding-top: calc(var(--header-height) + 2rem);
  }
  .contacts {
    columns: 1;
  }
}