:root {
  --text-color: #333333;
  --shadow-light: 1px 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-dark: 1px 1px 5px rgba(0, 0, 0, 0.4);
  --about-duration: 0.75s;
  --frontend-duration: 1.25s;
  --backend-duration: 0.75s;
  --mobile-boot-duration: 1s;
  --mobile-content-duration: 2s;
  --tech-interval: 0.5s;
}

body {
  margin: 0;
  padding: 0;
  color: var(--text-color);
  background: linear-gradient(
    to bottom,
    #FFFFFF,
    #FFFFFF,
    #F1FFF1,
    #F1F1FF,
    #FFF1F1,
    #FFFFFF,
    #FFFFFF
  );
  font-family: 'Work Sans', sans-serif;
  font-size: 1em;
  line-height: 1.75em;
}

section {
  position: relative;
  width: 100%;
  min-height: 300vh;
  -webkit-backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0);
}

a {
  color: var(--text-color);
}

.section-wrapper {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 100vh;
  padding: 0 50px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

.section-wrapper > *:first-child {
  margin: 0 0 50px 0;
}

.animation-wrapper {
  position: relative;
  width: 300px;
  height: 200px;
  transform: scale(0.8);
}

.animation-wrapper div,
.animation-wrapper span {
  border: 1px solid #000000;
}

#about img {
  width: 200px;
  height: auto;
}

#about-box {
  position: relative;
  padding: 20px;
  background-color: #FFFFFF;
  border: 1px solid transparent;
  border-radius: 20px;
}

#about.show #about-box {
  animation: var(--about-duration) forwards show-border;
}

#about.hide #about-box {
  animation: var(--about-duration) forwards hide-border;
}

@keyframes show-border {
  from { border-color: transparent; }
  to { border-color: #000000; }
}

@keyframes hide-border {
  from { border-color: #000000; }
  to { border-color: transparent; }
}

#about-box:after {
  position: absolute;
  top: 1px;
  left: 50%;
  content: "";
  width: 20px;
  height: 20px;
  background-color: #FEFEFE;
  border: 1px solid;
  border-top-color: transparent;
  border-right-color: transparent;
  border-bottom-color: transparent;
  border-left-color: transparent;
  transform: rotate(135deg) translateY(15px);
  z-index: 1;
}

#about.show #about-box:after {
  animation: var(--about-duration) forwards show-arrow-border;
}

#about.hide #about-box:after {
  animation: var(--about-duration) forwards hide-arrow-border;
}

@keyframes show-arrow-border {
  from {
    border-bottom-color: transparent;
    border-left-color: transparent;
  }
  to {
    border-bottom-color: #000000;
    border-left-color: #000000;
  }
}

@keyframes hide-arrow-border {
  from {
    border-bottom-color: #000000;
    border-left-color: #000000;
  }
  to {
    border-bottom-color: transparent;
    border-left-color: transparent;
  }
}

#about-box > p:nth-of-type(2) {
  color: #999999;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fade-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

#frontend-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 10%;
  background-color: #EAEAEA;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
  -webkit-backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0);
}

#frontend.show #frontend-header {
  animation: var(--frontend-duration) forwards frontend-header;
}

#frontend.hide #frontend-header {
  animation: var(--frontend-duration) forwards frontend-header-reversed;
}

@keyframes frontend-header {
  0% { box-shadow: var(--shadow-dark); opacity: 0; transform: translateY(-50px); }
  80% { box-shadow: var(--shadow-light); }
  100% { box-shadow: none; opacity: 1; transform: translateY(0px); }
}

@keyframes frontend-header-reversed {
  0% { box-shadow: none; opacity: 1; transform: translateY(0px); }
  80% { box-shadow: var(--shadow-light); }
  100% { box-shadow: var(--shadow-dark); opacity: 0; transform: translateY(-50px); }
}

#frontend-body-left {
  position: absolute;
  top: 10%;
  left: 0;
  width: 20%;
  height: 80%;
  background-color: #F3F3F3;
  border-bottom-left-radius: 4px;
  -webkit-backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0);
}

#frontend.show #frontend-body-left {
  animation: var(--frontend-duration) forwards frontend-body-left;
}

#frontend.hide #frontend-body-left {
  animation: var(--frontend-duration) forwards frontend-body-left-reversed;
}

@keyframes frontend-body-left {
  0% { box-shadow: var(--shadow-dark); opacity: 0; transform: translate(-20px, 30px); }
  80% { box-shadow: var(--shadow-light); }
  100% { box-shadow: none; opacity: 1; transform: translate(0px, 0px); }
}

@keyframes frontend-body-left-reversed {
  0% { box-shadow: none; opacity: 1; transform: translate(0px, 0px); }
  80% { box-shadow: var(--shadow-light); }
  100% { box-shadow: var(--shadow-dark); opacity: 0; transform: translate(-20px, 30px); }
}

#frontend-body-left > span {
  position: absolute;
  top: 10px;
  left: 10%;
  height: 3px;
  background-color: #D3D3D3;
  opacity: 0;
}

#frontend-body-left > span:nth-of-type(1) {
  max-width: 40%;
}

#frontend-body-left > span:nth-of-type(2) {
  top: 20px;
}

#frontend-body-left > span:nth-of-type(3) {
  top: 30px;
  max-width: 55%;
}

#frontend-body-left > span:nth-of-type(4) {
  top: 40px;
  max-width: 60%;
}

#frontend.show #frontend-body-left > span {
  animation: 1s calc(var(--frontend-duration) * 0.8) forwards frontend-body-left-text;
}

#frontend.hide #frontend-body-left > span {
  animation: 1s calc(var(--frontend-duration) * 0.8) forwards frontend-body-left-text-reversed;
}

@keyframes frontend-body-left-text {
  0% { width: 0; opacity: 0; }
  10% { opacity: 1; }
  100% { width: 70%; opacity: 1; }
}

@keyframes frontend-body-left-text-reversed {
  0% { width: 70%; opacity: 1; }
  10% { opacity: 0; }
  100% { width: 0; opacity: 0; }
}

#frontend-body-right {
  position: absolute;
  top: 10%;
  left: 20%;
  width: 80%;
  height: 80%;
  background-color: #FAFAFA;
  border-bottom-right-radius: 4px;
  -webkit-backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0);
}

#frontend.show #frontend-body-right {
  animation: var(--frontend-duration) forwards frontend-body-right;
}

#frontend.hide #frontend-body-right {
  animation: var(--frontend-duration) forwards frontend-body-right-reversed;
}

@keyframes frontend-body-right {
  0% { box-shadow: var(--shadow-dark); opacity: 0; transform: translate(30px, 40px); }
  80% { box-shadow: var(--shadow-light); }
  100% { box-shadow: none; opacity: 1; transform: translate(0px, 0px); }
}

@keyframes frontend-body-right-reversed {
  0% { box-shadow: none; opacity: 1; transform: translate(0px, 0px); }
  80% { box-shadow: var(--shadow-light); }
  100% { box-shadow: var(--shadow-dark); opacity: 0; transform: translate(30px, 40px); }
}

#frontend-body-right > span {
  position: absolute;
  top: 20px;
  width: 90px;
  height: 60%;
  background-color: #EEEEEE;
  opacity: 0;
}

#frontend-body-right > span:nth-of-type(1) {
  left: 20px;
}

#frontend-body-right > span:nth-of-type(2) {
  right: 20px;
}

#frontend.show #frontend-body-right > span {
  animation: var(--frontend-duration) var(--frontend-duration) forwards fade-in
}

#frontend.hide #frontend-body-right > span {
  animation: var(--frontend-duration) var(--frontend-duration) forwards fade-out;
}

#frontend.show #frontend-body-right > span:nth-of-type(2) {
  animation-delay: calc(var(--frontend-duration) * 1.25);
}

#frontend.hide #frontend-body-right > span:nth-of-type(2) {
  animation-delay: calc(var(--frontend-duration) * 1.25);
}

#backend-block-1 {
  top: 50%;
  left: 0;
  background-color: #F1A2E7;
  border-radius: 12px;
  transform: translateY(-50%);
}

#backend-block-2 {
  top: 5%;
  right: 0;
  background-color: #9191F9;
}

#backend-block-3 {
  bottom: 5%;
  right: 0;
  background-color: #F97A7A;
  border-radius: 50%;
  transform: scale(1.1);
}

.backend-block {
  position: absolute;
  width: 50px;
  height: 50px;
  border-width: 1.35px !important;
}

#backend.show .backend-block {
  animation: var(--backend-duration) forwards backend-block;
}

#backend.hide .backend-block {
  animation: var(--backend-duration) forwards backend-block-reversed;
}

@keyframes backend-block {
  from { box-shadow: var(--shadow-dark); opacity: 0; }
  to { box-shadow: none; opacity: 1; }
}

@keyframes backend-block-reversed {
  from { box-shadow: none; opacity: 1; }
  to { box-shadow: var(--shadow-dark); opacity: 0; }
}

#backend-line-base {
  left: 10%;
  transform: translateY(-50%);
}

#backend-line-fork-upwards {
  left: 50%;
  transform: rotate(-33.3deg) translateY(-50%);
}

#backend-line-fork-downwards {
  left: 50%;
  transform: rotate(33.3deg) translateY(-50%);
}

.backend-line {
  position: absolute;
  top: 50%;
  height: 0px;
  transform-origin: top left;
  opacity: 0;
}

#backend.show #backend-line-base {
  animation: var(--backend-duration) var(--backend-duration) forwards backend-line;
}

#backend.hide #backend-line-base {
  animation: var(--backend-duration) var(--backend-duration) forwards backend-line-reversed;
}

#backend.show #backend-line-fork-upwards,
#backend.show #backend-line-fork-downwards {
  animation: var(--backend-duration) calc(var(--backend-duration) * 2) forwards backend-line;
}

#backend.hide #backend-line-fork-upwards,
#backend.hide #backend-line-fork-downwards {
  animation: var(--backend-duration) calc(var(--backend-duration) * 2) forwards backend-line-reversed;
}

@keyframes backend-line {
  0% { opacity: 0; width: 0; }
  10% { opacity: 1; }
  100% { opacity: 1; width: 40%; }
}

@keyframes backend-line-reversed {
  0% { opacity: 40%; width: 1; }
  10% { opacity: 0; }
  100% { opacity: 0; width: 0; }
}

#mobile .animation-wrapper {
  width: 200px;
  height: 300px;
  transform: scale(0.6);
}

#mobile-frame {
  width: 150px;
  height: 100%;
  margin: 0 auto;
  padding: 8px;
  background-color: #444444;
  border-radius: 12px;
  box-sizing: border-box;
}

#mobile-screen {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: black;
  border-radius: 12px;
  overflow: hidden;
}

#mobile.show #mobile-screen {
  animation: var(--mobile-boot-duration) forwards mobile-screen-boot;
}

#mobile.hide #mobile-screen {
  animation: var(--mobile-boot-duration) forwards mobile-screen-shutdown;
}

@keyframes mobile-screen-boot {
  0% { background-color: black; }
  20% { background-color: white; }
  25% { background-color: black; }
  30% { background-color: white; }
  100% { background-color: white; }
}

@keyframes mobile-screen-shutdown {
  0% { background-color: white; }
  60% { background-color: black; }
  100% { background-color: black; }
}

#mobile-screen > span {
  position: absolute;
  left: 10%;
  width: 80%;
  height: 50px;
  background-color: #EDEDED;
  border-radius: 4px;
  opacity: 0;
}

#mobile-screen > span:nth-of-type(1) {
  top: 20px;
}

#mobile-screen > span:nth-of-type(2) {
  top: 80px;
}

#mobile-screen > span:nth-of-type(3) {
  top: 140px;
}

#mobile-screen > span:nth-of-type(4) {
  top: 200px;
}

#mobile-screen > span:nth-of-type(5) {
  top: 260px;
}

#mobile-screen > span:nth-of-type(6) {
  top: 320px;
}

#mobile-screen > span:nth-of-type(7) {
  top: 380px;
}

#mobile-screen > span:nth-of-type(8) {
  top: 440px;
}

#mobile-screen > span:nth-of-type(9) {
  top: 500px;
}

#mobile-screen > span:nth-of-type(10) {
  top: 560px;
}

#mobile.show #mobile-screen > span {
  animation: var(--mobile-content-duration) var(--mobile-boot-duration) forwards mobile-screen-content;
}

#mobile.hide #mobile-screen > span {
  animation: var(--mobile-content-duration) var(--mobile-boot-duration) forwards mobile-screen-content-reversed;
}

@keyframes mobile-screen-content {
  0% { opacity: 0; }
  20%, 70% { opacity: 1; transform: translateY(0); }
  100% { opacity: 1; transform: translateY(-360px); ; animation-timing-function: ease-in-out; }
}

@keyframes mobile-screen-content-reversed {
  0% { opacity: 1; ; transform: translateY(-360px); animation-timing-function: ease-in-out; }
  20%, 70% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; }
}

#contact > .section-wrapper > *:first-child {
  margin: 0 0 1em 0;
}

#contact a {
  text-decoration: none;
}

#contact a:visited {
  color: var(--text-color);
}

#contact a:focus {
  outline: none;
}

#contact a:hover {
  color: #777777;
  outline: none;
}

#contact-icons {
  display: flex;
  margin: 1em 0 0;
}

#contact-icons > a {
  font-size: 3em;
  margin: 0.5em;
}

section .techs > span {
  color: #888888;
  opacity: 0;
  animation-delay: calc(var(--tech-interval) * 5);
  -webkit-backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0);
}

section .techs > span:nth-of-type(1) {
  color: #444444;
  animation-delay: var(--tech-interval);
}

section .techs > span:nth-of-type(2) {
  color: #555555;
  animation-delay: calc(var(--tech-interval) * 2);
}

section .techs > span:nth-of-type(3) {
  color: #666666;
  animation-delay: calc(var(--tech-interval) * 3);
}

section .techs > span:nth-of-type(4) {
  color: #777777;
  animation-delay: calc(var(--tech-interval) * 4);
}

section.show .techs > span {
  animation-duration: var(--tech-interval);
  animation-fill-mode: forwards;
  animation-name: fade-in;
}

section.hide .techs > span {
  animation-duration: var(--tech-interval);
  animation-fill-mode: forwards;
  animation-name: fade-out;
}

@media screen and (min-width: 400px) {
  .animation-wrapper {
    transform: scale(1);
  }

  #mobile .animation-wrapper {
    transform: scale(0.8);
  }
}

@media screen and (min-width: 800px) {
  .section-wrapper {
    display: grid;
    grid-column-gap: 100px;
    grid-template-columns: min-content minmax(min-content, 600px);
    align-content: center;
    justify-items: center;
  }

  .section-wrapper > *:first-child {
    margin: 0;
  }

  #about > .section-wrapper {
    grid-template-columns: min-content minmax(min-content, 500px);
    justify-items: start;
  }

  #about-box:after {
    top: 50%;
    left: 1px;  
    transform: rotate(45deg) translateX(-15px);
  }

  #contact > .section-wrapper {
    display: flex;
  }
}