<div id="app">
  <div :class="['bg', bg]">
    <header>
      <nav>
        <ul>
          <li><a class="link-bio" href="#bio" @click="bg = 'bio'">Bio</a></li>
          <li><a class="link-projects" href="#projects" @click="bg = 'projects'">Projects</a></li>
          <li><a class="link-find-me" href="#findme" @click="bg = 'find-me'">Find Me</a></li>
        </ul>
      </nav>
      <div class="transition transition-bio"></div>
      <div class="transition transition-projects"></div>
      <div class="transition transition-find-me"></div>
      <h1>Header</h1>
    </header>
    <div class="dots dots1"></div>
    <div class="dots dots2"></div>
    <main>
      <transition name="slide-fade" mode="out-in">
        <p key="bio" v-if="bg==='bio'">Hi! I'm a bio page.</p>
        <p key="projects" v-if="bg==='projects'">This is a projects page.</p>
        <p key="find-me" v-if="bg==='find-me'">See <a href="https://pehaa.com" target="_blank" rel="noopener">pehaa.com</a> for the complete website (built with Nuxt.js).</p>
      </transition>
    </main>
  </div>
</div>

:root {
	--purple-brown: #231f20;
	--egg-shell: #e8e4d2;
	--dark-peach: #e26961;
  --border-width: .75rem;
  --dots-gap: 10px;
}
*, *:before, *:after {
  box-sizing: border-box;
}
body {
  font-family: Trocchi, Georgia, serif;
  line-height: 1.5;
  color: var(--egg-shell);
}
a {
  color: inherit;
}

.bg {
  background: inherit;
  min-height: 100vh;
  padding: 25vh 0 1.5rem;
  transition: background 0s 1s, color .6s;
}
.projects {
  color: var(--purple-brown);
}

// marie-louise
.bg:after {
	content: "";
	border: var(--border-width) solid;
	position: fixed;
	left: 0;
	top: 0;
	bottom: 0;
	right: 0;
  z-index: 12;
  pointer-events: none;
  transition: 1s;
}

.bio,
.link-bio {
  background: var(--purple-brown);
}

.bio h1 {
  background-color: var(--dark-peach);
}
.projects,
.link-projects {
  background: var(--egg-shell);
}

.find-me,
.link-find-me {
  background: var(--dark-peach);
}

// bg transition

.transition {
  width: 1rem;
  height: 1rem;
  top: 0;
  display: block;
  position: absolute;
  opacity: 0;
  transition: transform .6s ease-in-out;
  width: 100%;
  height: 100vh;
  transform: scale(0.1);
  transform-origin: 0 0;
}
.transition-bio {
  left: 0;
  background: var(--purple-brown);
}
.transition-projects {
  left: 7.5rem;
  background: var(--egg-shell);
}
.transition-find-me {
  left: 15rem;
  background: var(--dark-peach);
}

.bio .transition-bio,
.projects .transition-projects,
.find-me .transition-find-me {
  opacity: 1;
}
.bio .transition-bio {
  transform: scale(1);
}
.projects .transition-projects {
  transform: scale(1) translateX(-7.5rem) ;
}
.find-me .transition-find-me {
  transform: scale(1) translateX(-15rem) ;
}

// dots

.dots:before,
.dots:after {
  content: "";
  position: fixed;
	top: 0;
	bottom: 0;
	opacity: .5;
	z-index: 11;
	background-image: linear-gradient(var(--dark-peach) 20%,transparent 0);
  background-size: 100% var(--dots-gap);
  background-position: 0 0;
	animation: movebg .2s linear infinite;
	will-change: transform;	
	width: 2px;
}

.dots1:before {
  left: 5%;
}
.dots1:after {
  left: 15%;
}
.dots2:before {
  right: 75%;
}
.dots2:after {
  right: 5%;
}

.dots:after {
  animation-direction: reverse;
}

.projects {
  .dots:before,
  .dots:after {
    background-image: linear-gradient(var(--purple-brown) 20%,transparent 0);
  }
}
.find-me {
  .dots:before,
  .dots:after {
    background-image: linear-gradient(var(--egg-shell) 20%,transparent 0);
  }
}

@keyframes movebg {
  0% {
    transform: translate3d(0, 0, 0);
  }
  100% {
    transform: translate3d(0, var(--dots-gap), 0);
  }
}

// h1

h1 {
  font-family: "Anton", sans-serif;
  text-align: center;
  margin: 0;
  -webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	-webkit-mask-image: -webkit-gradient(linear,left top,left bottom,color-stop(0,#000),color-stop(.5,#000),color-stop(1,transparent));
	transition: background-position 1s, background-color 1s;
	text-align: center;
	font-size: calc(28vw + 1rem);
  font-weight: 400;
	line-height: 1;
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/tw-o.png'), url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/tw6-o.png'), url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/74321/tw5-o.png');
  background-size: 45vw auto, 45vw auto, 30vw auto;
  background-repeat: repeat-x;
  background-position: 0px 15%, 200px 25%, -50px 2vw;
}
.projects h1 {
  background-color: var(--dark-peach);
  background-position: -120px 15%, 230px 20%, -100px 3vw;
}
.find-me h1 {
  background-color: var(--egg-shell);
  background-position: -240px 15%, 260px 25%, -150px 1vw;
}


nav {
  position: fixed;
  top: var(--border-width);
  left: var(--border-width);
  z-index: 10;
  ul {
    list-style: none;
    display: flex;
    text-align: center;
    margin: 0;
    padding: 0;
  }
  li {
    flex: 1 0 7.5rem;
  }
  a {
    display: block;
    padding: .75rem 0 .5rem;
    color: var(--egg-shell);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: .875rem;
  }
  .link-projects {
    color: var(--purple-brown);
  }
}

// main

main {
  position: relative;
  max-width: 36rem;
  padding: 0 1.5rem;
  margin: -3rem auto 0;
  font-size: 2rem;
}

// main transitions

.slide-fade-enter-active {
  transition: all 1s ease;
}
.slide-fade-leave-active {
  transition: all .5s;
}
.slide-fade-enter, .slide-fade-leave-to {
  transform: translateY(2rem);
  opacity: 0;
}

new Vue({
  el: '#app',
  data() {
    return {
      bg: 'bio'
    }
  }
})