/* @import url('https://fonts.googleapis.com/css?family=Merriweather:900&display=swap'); */
@import url('https://fonts.googleapis.com/css?family=Consolas');


:root {
  --color-primary: rgb(0, 38, 38);
  /* --color-primary: #294c73; */
  --color-secondary: #ffffff;
  --duration: 1s;
  --nav-duration: calc(var(--duration) / 4);
  --ease: cubic-bezier(0.215, 0.61, 0.355, 1);
  --space: 1rem;
  --font-primary: 'Helvetica', sans-serif;
  /* --font-heading: 'Merriweather', serif; */
  --font-heading: 'Consolas', serif;

  --font-size: 1.125rem;
  --line-height: 1.5;
}

* {
  box-sizing: border-box;
}

h1 {
  margin-bottom: calc(var(--space) * 3);
  font-family: var(--font-heading);
  font-size: calc(var(--font-size) + 6vmin);
  line-height: calc(var(--line-height) / 1.25);
}

.main-navigation-toggle {
  position: fixed;
  height: 1px;
  width: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;

  +label {
    position: fixed;
    top: calc(var(--space) * 1.5);
    right: calc(var(--space) * 2);
    cursor: pointer;
    z-index: 2;
  }
}

.icon--menu-toggle {
  --size: calc(1rem + 4vmin);
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--size);
  height: var(--size);
  stroke-width: 6;
}

.icon-group {
  transform: translateX(0);
  transition: transform var(--nav-duration) var(--ease);
}

.icon--menu {
  stroke: var(--color-primary);
}

.icon--close {
  stroke: var(--color-secondary);
  transform: translateX(-100%);
}

.main-navigation {
  position: fixed;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  width: 50%;
  height: 100%;
  transform: translateX(100%);
  transition: transform var(--nav-duration);
  z-index: 1;

  &:after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: url('https://i.imgur.com/URGyHjt.jpeg');
    background-color: rgb(182, 182, 182);
    background-blend-mode: multiply;
    background-position: right 50% bottom 33%;
    transform-origin: 0 50%;
    z-index: -1;
  }

  ul {
    font-size: 6vmin;
    font-family: var(--font-heading);
    width: 100%;
  }

  li {
    --border-size: 1vmin;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;

    &:after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--border-size);
      background-color: var(--color-secondary);
      transform-origin: 0 50%;
      transform: translateX(-100%) skew(15deg);
    }
  }

  a {
    display: inline-block;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    color: var(--color-secondary);
    line-height: 1;
    text-decoration: none;
    user-select: none;
    padding: var(--space) calc(var(--space) * 2) calc(var(--space) + var(--border-size) / 2);
    transform: translateY(100%);
  }
}

.main-content {
  margin: 6rem auto;
  max-width: 70ch;
  padding: 0 calc(var(--space) * 2);
  transform: translateX(0);
  transition: transform calc(var(--nav-duration) * 2) var(--ease);

  >*+* {
    margin-top: calc(var(--space) * var(--line-height));
  }
}

.main-navigation-toggle:checked {
  ~label .icon--menu-toggle {
    .icon-group {
      transform: translateX(100%);
    }
  }

  ~.main-content {
    transform: translateX(10%);
  }

  ~.main-navigation {
    transition-duration: 0s;
    transform: translateX(0);

    &:after {
      animation: nav-bg var(--nav-duration) var(--ease) forwards;
    }

    /* li:after {
      animation: nav-line var(--duration) var(--ease) forwards;
    } */

    a {
      animation: link-appear calc(var(--duration) * 1.5) var(--ease) forwards;
    }

    @for $i from 1 through 4 {
      li:nth-child(#{$i}) {

        &:after,
        a {
          animation-delay: calc((var(--duration) / 2) * #{$i} * 0.125);
        }
      }
    }
  }
}

@keyframes nav-bg {

  /* from { transform: translateX(100%) skewX(-15deg) } */
  from {
    transform: translateX(100%)
  }
  to {
    transform: translateX(0)
  }
}

@keyframes nav-line {
  0% {
    transform: scaleX(0);
    transform-origin: 0 50%;
  }

  35% {
    transform: scaleX(1.001);
    transform-origin: 0 50%;
  }

  65% {
    transform: scaleX(1.001);
    transform-origin: 100% 50%;
  }

  100% {
    transform: scaleX(0);
    transform-origin: 100% 50%;
  }
}

@keyframes link-appear {

  0%,
  25% {
    transform: translateY(100%);
  }

  /* 0%, 25%   { transform: translateY(0); } */

  50%,
  100% {
    transform: translateY(0);
  }

}