/*
 *
 *  Style
 *  - CSS custom properties (variables)
 *  - general
 *  - loading
 *  - focus
 *  - container
 *  - background gradient
 *  - cursor follow
 *  - visually hidden
 *  - block
 *  - scroll down button
 *  - button
 *  - reduced motion
 *  - dark mode
 *  - responsive mode
 *
 */


/* CSS custom properties (variables) */
:root {
  --dark-blue: #283e61;
  --dark-purple: #58326f;

  --soft-blue: #99b3da;
  --soft-purple: #c07ee5;
  --soft-red: #da8d95;
  --soft-grey: rgba(0, 0, 0, 0.1);

  --light-grey: rgba(0, 0, 0, 0.2);

  --black: #000000;
  --white: #ffffff;
  --grey:  #666666;

  --yellow: #ffbf71;
}




/* general */
html {
  font-family: 'Raleway', 'Ubuntu', sans-serif;
  font-size: 62.5%;
}

body {
  overflow-x: hidden;
  position: relative;
  color: var(--black);
  background-color: var(--white);
  font-size: 1.6rem;
  line-height: 1.2;

  height: 100vh;
}

body.is-loaded {
  /*eight: auto;*/
}

body::before {
  content: '';
  display: block;
  height: 10vh;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--soft-grey);
  animation: loading 0.5s ease-in-out infinite alternate;
}

body.is-loaded::before {
  display: none;
}

body.is-loaded .container {
  opacity: 1;
}

/* animation (page loading) */
@keyframes loading {
  0% {
    opacity: 0.2;
    height: 1vh;
  }
  100% {
    opacity: 1;
    height: 100vh;
  }
}




/* loading */
.loading {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3rem;
  font-weight: 700;
  mix-blend-mode: soft-light;
}




/* focus */
*:focus {
  outline: 0.2rem solid var(--black);
  outline-offset: 0.4rem;
  border-radius: 0.1rem;
}




/* container */
.container {
  display: flex;
  align-items: center;
  padding: 4rem;
  min-height: calc(100vh - 8rem);

  opacity: 0;
  transition: opacity 0.3s ease;
}




/* Background gradient */
.container::before {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(-45deg, var(--soft-blue), var(--soft-purple));
  background-size: 100% 100%;
  opacity: 1;
}

/* Background pattern */
.container::after {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image:
    linear-gradient(35deg, hsla(0, 0%, 7%, 0.9), 80%,hsla(0, 0%, 7%, 0.6)),
    linear-gradient(transparent calc(50% - 0.1rem), var(--white) 0.1rem, transparent calc(50% + 0.1rem) 100%),
    linear-gradient(to right, transparent calc(50% - 0.1rem), var(--white) 0.1rem, transparent calc(50% + 0.1rem) 100%);
  background-size: 100% 100%, 0.5rem 0.5rem, 0.5rem 0.5rem;
  opacity: 0.35;
}




/* cursor follow */
.follow {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background-color: black;
  pointer-events: none;
  mix-blend-mode: soft-light;
}




/* visually hidden */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  border: 0;
  padding: 0;

  white-space: nowrap;
  clip-path: inset(100%);
  clip: rect(0 0 0 0);
  overflow: hidden;
}




/* header */
.header {
  position: fixed;
  z-index: 50;
  top: 0;
  right: 0;
  left: 0;
  padding: 2rem 4rem;

  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}




/* logo */
.logo {
  overflow: hidden;
  display: block;
  width: 13rem;
  font-family: 'Kulim Park';
  font-weight: 600;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--black);
}

.logo svg {
  width: 20rem;
  height: auto;
}




/* main */
.main-container {
  overflow: scroll;
  width: 100%;
  height: calc(100vh - 8rem);
  scroll-snap-type: y mandatory;

  & > * {
    scroll-snap-align: center;
  }

}




/* title */
.title-container {
  display: flex;
  flex-flow: column wrap;
  justify-content: center;

  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 104rem;
  height: calc(100vh - 8rem);
  margin-right: auto;
  margin-left: auto;
}

.title {
  width: 100%;
  margin-bottom: 3rem;
  font-size: clamp(4rem, 8vw, 10rem);
  font-family: 'Kulim Park';
  font-weight: 600;
  text-transform: uppercase;
  text-align: center;
  color: var(--white);
}

.title--404 {
  display: flex;
  flex-flow: column nowrap;
  align-items: center;
  gap: 0.5rem;
}

.title a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
}




/* intro */
.intro-container {
  display: flex;
  flex-flow: column nowrap;
  justify-content: center;

  position: relative;
  z-index: 10;
  height: calc(100vh - 8rem);
  color: var(--white);
  text-align: center;
}

.intro-main {
  width: 100%;
  max-width: 111rem;
  margin-right: auto;
  margin-left: auto;

  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  line-height: 1.6;
}

.intro-main b {
  font-weight: 500;
}


/* content */
.content-container {
  display: flex;
  flex-flow: column nowrap;
  justify-content: center;

  position: relative;
  z-index: 10;
  height: calc(100vh - 8rem);
  color: var(--white);
  text-align: center;
}

.content-experience {
  overflow: hidden;
  padding: 6rem 4rem;
  background-color: rgba(0, 0, 0, 0.1);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  width: 80%;
  max-width: 80rem;
  margin-right: auto;
  margin-left: auto;
  font-size: 2rem;
  font-weight: 300;
  line-height: 1.4;
}

.content-experience b {
  font-weight: 500;
}




/* horizontal line */
hr {
  position: relative;
  width: 100%;
  height: 0.2rem;
  border: none;
  margin-top: 2.5rem;
  margin-bottom: 2.5rem;
}

hr::before {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.1);
  clip-path: polygon(0 80%, 100% 0, 100% 100%, 0 100%);
}




/* scroll down button */
.scroll-down-button {
  position: absolute;
  z-index: 20;
  bottom: 4rem;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-down-button button {
  display: inline-flex;
  flex-flow: row nowrap;
  align-items: center;

  overflow: hidden;
  position: relative;
  z-index: 15;
  width: 4rem;
  height: 4rem;
  background-color: transparent;
  border: none;
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.5;
  outline: none;

  cursor: pointer;
  opacity: 0.5;

  transition: opacity 0.2s ease;
}

.scroll-down-button button:hover,
.scroll-down-button button:focus {
  opacity: 0.85;
}

.scroll-down-button button::before {
  content: '';
  position: absolute;
  top: 2rem;
  left: 0.5rem;
  display: inline-block;
  width: 2rem;
  height: 0.1rem;
  background-color: rgba(255, 255, 255, 0.9);
  transform: rotate(40deg);
}

.scroll-down-button button::after {
  content: '';
  position: absolute;
  top: 1.9rem;
  right: 0.3rem;
  display: inline-block;
  width: 2rem;
  height: 0.1rem;
  background-color: rgba(255, 255, 255, 0.9);
  transform: rotate(-38deg);
}

.scroll-down-button__icon::before {
  content: '';
  position: absolute;
  top: 1.3rem;
  left: 0.8rem;
  display: inline-block;
  width: 1.7rem;
  height: 0.1rem;
  background-color: rgba(255, 255, 255, 0.9);
  transform: rotate(40deg);
}

.scroll-down-button__icon::after {
  content: '';
  position: absolute;
  top: 1.2rem;
  right: 0.6rem;
  display: inline-block;
  width: 1.7rem;
  height: 0.1rem;
  background-color: rgba(255, 255, 255, 0.9);
  transform: rotate(-38deg);
}




/* button */
.button-container {
  position: relative;
  display: inline-block;
}

.button-container::before {
  content: '';
  display: block;
  width: 110%;
  height: 0.2rem;
  background-color: var(--white);
  position: absolute;
  z-index: 20;
  bottom: 0.4rem;
  left: -5%;
  transform: rotate(1deg);
  opacity: 0.9;
}

.button-container::after {
  content: '';
  display: block;
  width: 0.2rem;
  height: 110%;
  background-color: var(--white);
  position: absolute;
  z-index: 20;
  bottom: -5%;
  right: 0.4rem;
  transform: rotate(185deg);
  opacity: 0.9;
}


.button {
  display: inline-flex;
  flex-flow: row nowrap;
  align-items: center;
  gap: 1rem;

  overflow: hidden;
  position: relative;
  z-index: 15;
  padding: 1.2rem 1.6rem 1.2rem 1rem;
  background-color: rgba(0, 0, 0, 0.1);
  border-radius: 0.2rem;
  text-decoration: none;
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.5;
  clip-path: polygon(0 10%, 100% 0, 100% 90%, 0 100%);

  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.4) 18%, rgba(0, 0, 0, 0.3) 33%);
  background-size: 100vw;

  transition: background-image 0.2s ease;
}

.button svg {
  position: relative;
  z-index: 2;
  width: 3rem;
  height: auto;
  fill: var(--white);
}

.button span {
  position: relative;
  z-index: 2;
  color: var(--white);
}

.button::before {
  content: '';
  position: absolute;
  z-index: 1;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.1);
  transform: translateX(-100%);
  transition: transform 0.2s ease;
}

.button:hover::before,
.button:focus::before {
  transform: translateX(0);
}

.button--footer {
  gap: 0;
  padding: 1rem;
  background-color: rgba(0, 0, 0, 0.1);
  background-image: none;
}

.button--codepen {
  padding: 1.5rem;
}

.button--codepen svg {
  width: 2rem;
}

.link {
  overflow: hidden;
  display: inline-flex;
  position: relative;
  color: var(--white);
  text-decoration: none;
}

.link--title {
  font-size: 2rem;
}

.link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: block;
  width: 100%;
  height: 0.1rem;
  transform: translateX(0);
  background-color: rgba(255, 255, 255, 0.5);
  transition: transform 0.2s ease, opacity 0.4s ease;
}

.link:hover::before,
.link:focus::before {
  transform: translatex(-100%);
  opacity: 0;
}




/* Footer */
.footer {
  position: fixed;
  z-index: 50;
  bottom: 0;
  right: 0;
  left: 0;
  padding: 2rem 4rem;

  display: flex;
  flex-flow: row wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  color: var(--white);
}

.footer-list {
  display: flex;
  flex-flow: row wrap;
  align-items: center;
  gap: 2rem;

  opacity: 0.8;
}

.footer__credits span {
  display: flex;
  align-items: center;
}

.footer__credits__icon {
  width: 2.4rem;
  height: auto;
  fill: var(--white);
}



/* reduced motion */
@media (prefers-reduced-motion) {
  *,
  *::before,
  *::after {
    animation: paused !important;
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
    scroll-behavior: auto !important;
  }

  body::before {
    width: 100%;
  }

  .loading {
    opacity: 0.3;
  }

  .follow {
    display: none;
  }

}




/* dark mode */
.dark-mode {
  --soft-red: #c13947;
  --soft-blue: #477ac9;
  --soft-purple: #9638ce;

  .container::before {
    opacity: 0.8;
  }
}



/* responsive mode */
@media only screen and (max-width: 700px) {

  .container {
    display: block;
    align-items: flex-start;
    min-height: 0;
  }

  .logo {
    width: 9rem;
  }

  .logo svg {
    width: 14rem;
  }

  .scroll-down-button {
    display: none;
  }

  .button-container::before {
    height: 0.1rem;
  }

  .button-container::after {
    width: 0.1rem;
  }

  .button {
    gap: 0.5rem;

    padding: 0.8rem 1.2rem 0.8rem 0.8rem;
    font-size: 1.8rem;
  }

  .button--footer {
    gap: 0;

    padding: 0.8rem;
  }

  .button--codepen {
    padding: 1.3rem;
  }

  .header,
  .footer {
    position: relative;
    top: auto;
    right: auto;
    left: auto;
    flex-direction: column;
    flex-wrap: wrap;
    padding: 0;
  }

  .header {
    padding-bottom: 6rem;
  }

  .footer {
    padding-top: 6rem;
    text-align: center;
  }

  .logo-container {
    order: 2;
    width: 9.4rem;
    margin-bottom: 2rem;
  }

  .main-container {
    overflow: unset;
    height: auto;
    scroll-snap-type: unset;

    & > * {
      scroll-snap-align: unset;
    }
  }

  .title-container,
  .intro-container,
  .content-container {
    height: auto;
    padding: 6rem 0;
  }

  .intro-main {
    overflow: hidden;
    padding: 4rem 3rem;
    background-color: rgba(0, 0, 0, 0.1);
    clip-path: polygon(0 10%, 100% 0, 100% 90%, 0 100%);
    width: 80%;
    margin-right: auto;
    margin-left: auto;
  }

  .content-experience {
    width: 80%;
    font-size: 1.8rem;
  }

  .follow {
    display: none;
  }

}

@media only screen and (max-height: 600px) {

  .container {
    display: block;
    align-items: flex-start;
    min-height: 0;
  }

  .header,
  .footer {
    position: relative;
    top: auto;
    right: auto;
    left: auto;
  }

  .header {
    padding-bottom: 6rem;
  }

  .footer {
    padding-top: 6rem;
  }

  .main-container {
    overflow: unset;
    height: auto;
    scroll-snap-type: unset;

    & > * {
      scroll-snap-align: unset;
    }
  }

  .title-container,
  .intro-container,
  .content-container {
    height: auto;
    padding: 6rem 0;
  }

  .intro-main {
    overflow: hidden;
    padding: 4rem 3rem;
    background-color: rgba(0, 0, 0, 0.1);
    clip-path: polygon(0 10%, 100% 0, 100% 90%, 0 100%);
    width: 80%;
    margin-right: auto;
    margin-left: auto;
  }

  .content-experience {
    width: 80%;
    font-size: 1.8rem;
  }

}