/* PAGE STYLES */
@import url(https://cdn.jsdelivr.net/gh/tonsky/FiraCode@1.206/distr/fira_code.css);

* {
  scroll-behavior: smooth;
}

/* --> BASE STYLES <-- */
:root {
  --page-margin-inline: 1em;
  --neutral-900: #1e1e3cff;
  --neutral-900-25: #1e1e3c33;
}

body {
  font-family: 'fira code', monospace;
  color: #1e1e3cff;
}

p {
  max-width: 80ch;
}

p > img:first-of-type {
  margin-top: 2em;
}

em {
  font-family: serif;
  font-size: 1.03em;
}

a, a:visited {
  color: #1e1e3cff;
  padding-bottom: 2px;
  text-decoration: none;
  border-bottom: 1px #1e1e3c50 solid;
  transition: color ease 0.5s, border ease 0.2s;
}

img {
  max-width: 100%;
  height: auto;
  outline: 1px dotted var(--neutral-900);
}

hr {
  border-bottom: thin dotted grey;
  border-top: none;
  border-left: none;
  border-right: none;
}

section {
  isolation: auto;
}

/* --> LISTS <-- */
ul {
  list-style: none;
  margin-left: 16px;
  padding-left: 0;
}

li {
  padding: 0.2em 0 0.2em 1em;
}

li:before {
  content: "▸";
  padding-right: 16px;
}

/* --> NAVIGATION <-- */

nav#toTop {
  position: fixed;
  display: inline-block;
  visibility: hidden;
  top: calc(95vh - 2em);
  right: 3em;
  overflow: hidden;
  padding: 0 0em 0.25em;
  z-index: 100;
}

nav#toTop.active {
  visibility: visible;
}

nav#toTop > span {
  display: block;
  opacity: 0.0;
  transform: translateY(-2em);
  background-color: rgba(255,255,255,0.0);
  padding: 0.3em 0.5em 0.5em;
  border-radius: 1em;
  transition: transform ease 0.5s, opacity ease 1s, background-color ease 0.5s 0.5s;
}

nav#toTop > span::after {
  font-size: 1.25em;
  content: '△'
}

nav#toTop.active > span {
  opacity: 0.5;
  background-color: rgba(255,255,255,0.9);
  transform: translateY(0em);
}

nav#toTop.active > span:hover {
  opacity: 1;
  cursor: pointer;
}

/* --> MAINPAGE CONSTRUCTION <-- */
nav#sub > ul {
  margin: 0;
  padding: 0;
  list-style: none !important;
}

nav#sub > ul > li {
  border-left: thin solid #d2d2d8;
  text-decoration: none;
  padding: 5px 10px;
}

nav#sub > ul > li:before {
  content: '';
  padding: unset;
}

nav#sub > ul > li:hover {
  background: #d2d2d8;
  cursor: pointer;
}

nav#sub > ul > li > a {
  border: none;
}

/* --> SUBCONTENT CONSTRUCTION <-- */
section.page {
  display: grid;
  animation: fadeIn 1s ease;
  margin-inline: var(--page-margin-inline);
}

section.page h1 {
  margin: 0px;
  padding: 0px;
}

@media screen and (min-width: 1360px) {
  body {
    font-size: 19px;
    line-height: 24px;
    margin: 0;
    padding: 0;
  }

  /* --> MAINPAGE CONSTRUCTION <-- */
  section ul.subMenu {
    font-size: 1.5em;
  }

  /* --> SUBCONTENT CONSTRUCTION <-- */
  section.page {
    max-width: 1960px;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
  }

  section.page h1 {
    margin-top: 0.25em;
    margin-bottom: 0.4em;
    font-size: 6em;
    line-height: 0.95em;
  }

  section.page div.imgFeat {
    grid-column: span 4;
  }

  section.page section.imgs {
    grid-column: 4 / span 2;
    grid-row: 2;
  }

  section.page section.imgs>img {
    max-width: 100%;
    margin-bottom: 24px;
    height: auto;
  }

  section.page section.text {
    grid-column: 1 / span 3;
    grid-row: 2;
  }
}

@media screen and (max-width: 1359px) {
  body {
    font-size: 19px;
    line-height: 24px;
    margin: 0;
    padding: 0;
  }

  /* --> MAINPAGE CONSTRUCTION <-- */
  section ul.subMenu {
    font-size: 1.5em;
  }

  /* --> SUBCONTENT CONSTRUCTION <-- */
  section.page {
    max-width: 1960px;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
  }

  section.page h1 {
    margin-top: 0.25em;
    margin-bottom: 0.5em;
    font-size: 4em;
    line-height: 0.95em;
  }

  section.page div.imgFeat {
    grid-column: span 4;
  }

  section.page section.imgs {
    grid-column: 4 / span 2;
    grid-row: 2
  }

  section.page section.imgs>img {
    max-width: 100%;
    height: auto;
  }

  section.page section.text {
    grid-column: 1 / span 3;
    grid-row: 2;
  }
}

@media screen and (max-width: 800px) {
  body {
    font-size: 20px;
    line-height: 24px;
    margin: 0;
    padding: 0;
  }

  /* --> SUBCONTENT CONSTRUCTION <-- */
  section.page {
    display: inherit;
    grid-gap: 1em;
    margin-inline: calc(var(--page-margin-inline) * 0.5);
  }

  section.page h1 {
    margin-top: 0.35em;
    margin-bottom: 0.5em;
    font-size: 3em;
    line-height: 0.95em;
    margin: 24px 0 32px;
  }

  section#teach h1 {
    font-size: 3em;
    line-height: 0.75em;
    margin: 40px 0 48px;
  }

}

/* ANIMATIONS */

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}