@import url("https://fonts.googleapis.com/css?family=Work+Sans:300,600");

html {
  overflow-x: hidden;
}

:root {
  --cl-background: #0d1117;
  --cl-background-transparent: #0d1117aa;
  --cl-light-nav-background: #25282e; /* #3d4045 as lighter tone alternative */
  --cl-font: #eee;

  --cl-secondary-200: rgba(173, 216, 230, 0.75);
  --cl-secondary-900: #1a1a19;

  --nav-toggle-outline: var(--cl-secondary-200);

  --ff-primary: "Helvetica", Arial, sans-serif;
  --ff-secondary: "Work Sans", Arial, sans-serif;

  --fs-title-desktop: 1.5rem;
  --fs-title-mobile: 0.8rem;
  --fs-page-description: 1rem;
  --fs-text-mobile: 1rem;
  --fs-text-desktop: 1.5rem;

  --fw-regular: 400;
  --fw-semi-bold: 500;
  --fw-bold: 700;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
}

body {
  min-height: 100vh;
  background: var(--cl-background);
  font-family: var(--ff-primary);
  font-weight: var(--fw-regular);
  color: var(--cl-font);
  display: grid;
}

/* navigation styles start here */

header {
  background: var(--cl-background);
  text-align: center;
  position: fixed;
  z-index: 1;
  width: 100%;
  padding-bottom: 1.4em;
}

.logo {
  font-size: 10.62vmax;
  line-height: 10.62vmax;
  font-weight: var(--fw-bold);
  letter-spacing: -0.1em;
  color: var(--cl-font);
  text-decoration: none;
  margin-bottom: 0.16em;
}

.logo a {
  color: var(--cl-font);
  text-decoration: none;
}

.nav-toggle {
  position: absolute !important;
  top: -9999px !important;
  right: -9999px !important;
}

.nav-toggle:focus ~ .nav-toggle-label {
  outline: 3px solid var(--nav-toggle-outline);
}

.nav-toggle-label {
  position: absolute;
  top: 0;
  right: 0;
  margin-right: 1em;
  height: 100%;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.nav-toggle-label:hover span::before {
  transform: translateX(-10px);
  transition: all 0.35s ease-in-out;
}

.nav-toggle-label:hover span::after {
  transform: translateX(-10px);
  transition: all 0.35s ease-in-out;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  background: #eee;
  height: 2px;
  width: 2em;
  border-radius: 2px;
  position: relative;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: "";
  position: absolute;
}

.nav-toggle-label span::before {
  bottom: 7px;
}

.nav-toggle-label span::after {
  top: 7px;
}

.nav-toggle-label.is-open span {
  transform: rotate(45deg);
  transition: transform 0.5s ease-in-out;
  bottom: 0.5em;
}

.nav-toggle-label.is-open span::before {
  transform: rotate(-45deg);
  transition: transform 400ms ease-in-out;
}

.nav-toggle-label.is-open span::after {
  transform: rotate(45deg);
  transition: transform 400ms ease-in-out;
}

nav {
  position: absolute;
  text-align: center;
  top: 100%;
  left: 0;
  width: 100%;
  transform: scale(1, 0);
  transform-origin: top;
  transition: transform 400ms ease-in-out;
  background: var(--cl-light-nav-background);
}

nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

nav li {
  margin-top: 1em;
  margin-bottom: 1em;
}

nav a {
  text-transform: uppercase;
  color: #eee;
  text-decoration: none;
  font-size: 1.2rem;
  opacity: 0;
  transition: opacity 150ms ease-in-out;
}

.nav-toggle:checked ~ nav {
  transform: scale(1, 1);
}

.nav-toggle:checked ~ nav a {
  opacity: 1;
  transition: opacity 250ms ease-in-out 250ms;
}

/***********************************/
/***********************************/
/* base styles for common elements */
/***********************************/
/***********************************/

.content {
  /* height: 100vh; */
  display: grid;
  /* place-items: center; */
  justify-content: center;
  /* grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); */
  grid-template-columns: 1fr auto auto, 1fr;
  grid-auto-rows: minmax(120px, auto);
  padding: 3em 2em;
  margin-top: 12vmax;
}

.introduction {
  display: grid;
}

.introduction h2 {
  font-size: var(--fs-title-desktop);
}

.container {
  overflow-x: hidden;
  /* justify-content: left; */
  padding: 3em 2em;
  margin-top: 12vmax;
}

.page-title {
  font-size: var(--fs-title-desktop);
}

.page-title h1 {
  text-transform: uppercase;
  padding-bottom: 0.25rem;
}

.error-not-found {
  text-align: center;
  margin-top: -20px;
}

.error-code {
  font-size: 5vmax;
  line-height: 5vmax;
}

.error-message {
  font-size: 2vmax;
  line-height: 2vmax;
}

.description {
  padding-top: 0.8em;
  font-size: var(--fs-text-desktop);
}

.item-list {
  padding-top: 3em;
}

.item-list ul {
  margin: 0;
  padding: 0;
}

.item-list li {
  list-style-type: square;
  margin-left: 1rem;
  padding-bottom: 0.8rem;
  font-size: 1.3rem;
  line-height: 1.5rem;
}

.item-list a {
  color: var(--cl-font);
  text-decoration: none;
}

.item-list a:hover {
  color: #eee;
  text-decoration: underline;
}

/* footer styles */

footer {
  color: #eee;
  margin: 1rem;
  margin-top: auto;
  text-align: center;
}

footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
  justify-content: center;
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 0.2rem;
}

footer li {
  margin: 0 0.5rem;
}

footer img {
  width: 75%;
  height: auto;
}

.copyright {
  margin-bottom: 0.2rem;
}

/***********************************/
/***********************************/
/*         desktop styles          */
/***********************************/
/***********************************/

@media screen and (min-width: 988px) {
  .nav-toggle-label {
    display: none;
  }

  header {
    position: absolute;
    display: grid;
    /* TODO: check this one mate for header & body alignment */
    grid-template-columns: 1fr auto 4fr 1fr;
  }

  .logo {
    grid-column: 2 / 3; /* start and finish of logo*/
  }

  nav {
    all: unset;
    grid-column: 3 / 4;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding-top: 3.6rem;
  }

  nav ul {
    display: flex;
  }

  nav li {
    margin-left: 3em;
    margin-bottom: 0;
  }

  nav a {
    opacity: 1;
    position: relative;
  }

  nav a::before {
    content: "";
    display: block;
    height: 5px;
    background: #eee;
    position: absolute;
    bottom: -0.75em;
    left: 0;
    right: 0;
    transform: scale(1, 0);
    transition: transform ease-in-out 250ms;
  }

  nav a:hover::before {
    transform: scale(1, 1);
  }

  .content {
    padding: 3em;
    margin-top: 12vmax;
    width: 100%;
    max-width: 1180px;
    margin-left: auto;
    margin-right: auto;
    padding: 3em 1em;
  }

  /* already using desktop size for mobilephone view as well */
  /*   .page-title {
    font-size: var(--fs-title-desktop);
  }

  .description {
    font-size: var(--fs-text-desktop);
  } */

  .introduction-text-1 {
    grid-column: 3 / 4;
    padding-left: 1.5em;
  }

  .introduction-text-2 {
    grid-row: 5 / auto;
    padding-right: 9em;
    padding-top: 3em;
  }

  .introduction-text-3 {
    grid-column: 3 / 4;
    grid-row: 9 / auto;
    margin-left: -2em;
    padding-top: 3em;
  }

  .introduction-text-4 {
    grid-column: 1 / 2;
    grid-row: 11 / auto;
    padding-left: 19em;
    padding-top: 5em;
  }

  .container {
    padding: 3em;
    margin-top: 12vmax;
    width: 100%;
    max-width: 1180px;
    margin-left: auto;
    margin-right: auto;
    padding: 3em 1em;
  }

  .item-list {
    padding-top: 5rem;
  }

  .item-list li {
    list-style-type: square;
    margin-left: 1rem;
    padding-bottom: 1.5rem;
    font-size: 1.3rem;
    line-height: 1.5rem;
  }
}