@import url("https://fonts.googleapis.com/css2?family=Cascadia+Code:ital,wght@0,200..700;1,200..700&family=Geologica:wght@100..900&display=swap");

@layers system interface content colorscheme animation demonstration;

@layer system {
  :not(details.page) > details.page {
    position: relative;
    counter-reset: page 0;
  }

  :not(details.page) > details.page[open] > summary {
    display: none;
  }

  details.page {
    --pages-page-width: max(20vw, 380px);
    --pages-page-height: max(40vh, 370px);
    --pages-page-padding: 1rem;
    width: var(--pages-page-width, max(20vw, 380px));
    height: var(--pages-page-height, max(40vh, 370px));
    box-sizing: border-box;
    padding: var(--pages-page-padding, 1rem);
    border-radius: 0.75rem;
    overflow: hidden;
  }

  details.page > details.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }

  details.page[open] {
    z-index: 10;
    counter-increment: page 1;
  }

  details.page > :not(details, summary) {
    z-index: 1;
    position: relative;
  }

  details.page > summary {
    z-index: 5;
    right: var(--pages-page-padding, 1rem);
    bottom: var(--pages-page-padding, 1rem);
    position: absolute;
    max-width: calc(50% - var(--pages-page-padding, 1rem));
    min-width: 30px;
    width: min-content;
    box-sizing: border-box;
    padding: 0.4rem 1rem;
    display: flex;
    gap: 0.2rem;
    justify-content: center;
    cursor: pointer;
    border-radius: 0.75rem;
  }

  details.page[open] > summary {
    left: var(--pages-page-padding, 1rem);
    right: unset;
  }

  details.page[open] > summary:before {
    content: var(--localization-button-previous, "Previous");
  }

  details.page[open] > details.page:not([open]) > summary:before {
    content: var(--localization-button-next, "Next");
  }
}

@layer content {
  @layer page {
    details.page > section.content {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      box-sizing: border-box;
      padding: var(--pages-page-padding, 1rem);
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    details.page > section.content > span:has(> :is(span, a).separated) {
      justify-content: space-between;
    }

    details.page > section.content > :is(h2, h3) {
      margin: unset;
      margin-top: 0.2rem;
      text-align: center;
      font-weight: 200;
    }
  }

  @layer author {
    details.page#author > section.content {
      --pages-author-avatar-diameter: 200px;
      padding: var(--pages-page-padding, 1rem)
        calc(var(--pages-page-padding, 1rem) + 0.5rem);
      gap: unset;
    }

    details.page#author > section.content > h2 {
      font-weight: 500;
      font-family: "Cascadia Code";
    }

    details.page#author > section.content > h2 + span#name {
      margin-bottom: 1.2rem;
      align-self: center;
      font-weight: 400;
      font-family: "Cascadia Code";
    }

    details.page#author > section.content > span {
      margin-bottom: 0.6rem;
      display: inline-flex;
      font-family: "Cascadia Code";
    }

    details.page#author > section.content > div.x:has(> div.y > img#avatar) {
      --pages-author-avatar-diameter: 100px;
      z-index: -10;
      width: 100%;
      height: calc(100% - (var(--pages-page-padding, 1rem) * 2 + 3rem));
    }

    details.page#author > section.content > div.x > div.y:has(> img#avatar) {
      width: 100%;
      height: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    details.page#author > section.content > div.x > div.y > img#avatar {
      z-index: 20;
      position: absolute;
      width: var(--pages-author-avatar-diameter, 100px);
      height: var(--pages-author-avatar-diameter, 100px);
      align-self: center;
      object-fit: cover;
      border-radius: 5rem 5rem 100% 100%;
    }
  }

  @layer xiaomi {
    details.page#xiaomi > section.content > img.xiaomi {
      --pages-xiaomi-image-diameter: 120px;
      position: absolute;
      right: 15%;
      bottom: 30%;
      width: var(--pages-xiaomi-image-diameter, 120px);
      height: var(--pages-xiaomi-image-diameter, 120px);
      border-radius: 0.75rem;
    }
  }

  @layer destiny {
    details.page#destiny > section.content > img#masha {
      position: absolute;
      top: -10%;
      height: 150%;
      align-self: center;
    }

    details.page#destiny > section.content > img.masha.red {
      z-index: 100;
      position: absolute;
      top: -10%;
      height: 150%;
      align-self: center;
      mix-blend-mode: overlay;
    }

    details.page#destiny > section.content > div#css {
      z-index: 50;
      position: absolute;
      top: 0;
      left: 0;
      box-sizing: border-box;
      display: flex;
      width: 100%;
      height: 100%;
      mix-blend-mode: multiply;
      /* font-size: 0.8rem; */
    }

    details.page#destiny > section.content > div#css > div.color {
      width: 100%;
      height: 100%;
      display: block;
    }

    details.page#destiny > section.content > div#css > div.color > span.flow {
      word-break: break-all;
      position: absolute;
      scale: 1.5;
      font-family: "Cascadia Code", sans-serif;
      /*       font-size: 0.7rem; */
      /* height: 130rem; */
      width: 100%;
      overflow: hidden;
      /* line-height: 1rem; */
    }
  }

  @layer license {
    details.page#license > section.content > p {
      margin: unset;
      font-family: "Cascadia Code", sans-serif;
      font-size: smaller;
    }
  }
}

@layer colorscheme {
  details.page {
    outline: var(
      --pages-page-outline,
      2px solid var(--invert-background-color, #fff)
    );
    background-color: var(
      --pages-page-background-color,
      var(--section-background-color, #000)
    );
  }

  details.page > summary {
    /*     outline-offset: -2px; */
  }

  details.page > summary:hover {
    /*     outline-offset: 2px;
    transition: outline-offset 0.1s ease-in; */
  }

  details.page > summary:active {
    filter: brightness(0.8);
    /*     outline-offset: -2px;
    transition: outline-offset 0.05s ease-out; */
  }

  details.page[open] > summary {
    color: var(
      --pages-button-previous-text-color,
      var(--pages-button-previous-text-color, var(--button-text-color, #000))
    );
    /*     outline: 2px solid
      var(
        --pages-button-previous-background-color,
        var(
          --pages-button-previous-background-color,
          var(--button-background-color, #fff)
        )
      ); */
    background-color: var(
      --pages-button-previous-background-color,
      var(
        --pages-button-previous-background-color,
        var(--button-background-color, #fff)
      )
    );
  }

  details.page[open] > details.page:not([open]) > summary {
    color: var(
      --pages-button-next-text-color,
      var(--pages-button-next-text-color, var(--button-text-color, #000))
    );
    /*     outline: 2px solid
      var(
        --pages-button-next-background-color,
        var(
          --pages-button-next-background-color,
          var(--button-background-color, #fff)
        )
      ); */
    background-color: var(
      --pages-button-next-background-color,
      var(
        --pages-button-next-background-color,
        var(--button-background-color, #fff)
      )
    );
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--background-color, #000);
    filter: contrast(50);
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border {
    z-index: 10;
    position: absolute;
    width: calc(var(--pages-author-avatar-diameter, 100px) + 1rem);
    height: var(--pages-author-avatar-diameter, 100px);
    border-radius: 100%;

    filter: blur(25px);
    /*     mix-blend-mode: multiply; */
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border:nth-of-type(1) {
    background-color: white;
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border:nth-of-type(2) {
    width: var(--pages-author-avatar-diameter, 100px);
    height: calc(var(--pages-author-avatar-diameter, 100px) + 1rem);
    background-color: white;
  }

  details.page#author
    > section.content
    > div.x
    > div.y
    > img#avatar
    ~ div.border:nth-of-type(3) {
    background-color: white;
  }
}

@layer animation {
  @keyframes determination-x {
    0% {
      transform: translateX(20%);
    }

    100% {
      transform: translateX(-20%);
    }
  }

  @keyframes determination-y {
    0%,
    5% {
      transform: translateY(30px);
    }

    95%,
    100% {
      transform: translateY(-30px);
    }
  }

  @keyframes determination-rotate {
    0% {
      rotate: 10deg;
    }

    100% {
      rotate: -10deg;
    }
  }

  @keyframes determination-border {
    0% {
      transform: rotate(0deg) translateY(9px);
    }

    100% {
      transform: rotate(360deg) translateY(-9px);
    }
  }

  details.page#author > section.content > div.x:has(> div.y > img#avatar) {
    animation-name: determination-x;
    animation-duration: 1.8s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.5, 0, 0.55, 1);
  }

  details.page#author > section.content > div.x > div.y:has(> img#avatar) {
    animation-name: determination-y;
    animation-duration: 2.2s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.3, 0, 0.5, 1);
  }

  details.page#author > section.content > div.x > div.y > img#avatar {
    animation-name: determination-rotate;
    animation-duration: 2s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.3, 0, 0.3, 1);
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border {
    animation-name: determination-border;
    animation-duration: 2s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.5, 0, 0.5, 1);
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border:nth-of-type(1) {
    animation-duration: 2s;
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border:nth-of-type(2) {
    animation-duration: 3s;
  }

  details.page#author
    > section.content
    > div.x
    > div.y:has(> img#avatar)
    > div.effects
    > div.border:nth-of-type(3) {
    animation-duration: 1.7s;
  }

  @keyframes page-from {
    0% {
      top: 0px;
      opacity: 1;
      filter: blur(0px);
    }

    100% {
      top: -10px;
      opacity: 0;
      filter: blur(1px);
    }
  }

  @keyframes page-to {
    0% {
      top: 10px;
      opacity: 0;
      filter: blur(1px);
    }

    100% {
      top: 0px;
      opacity: 1;
      filter: blur(0px);
    }
  }

  /*   details.page:has(> summary:focus) > section.content {
    animation-name: page-to;
    animation-duration: 0.1s;
    animation-iteration-count: 1;
    animation-fill-mode: forwards;
    animation-timing-function: ease-out;
  }

  details.page[open]:has(> details.page > summary:focus) > section.content {
    animation-name: page-from;
    animation-duration: 0.1s;
    animation-iteration-count: 1;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in;
  } */

  /*   details.page[open]:has(> summary:focus) > section.content {
    animation-name: page-from;
    animation-duration: 0.1s;
    animation-iteration-count: 1;
    animation-fill-mode: forwards;
    animation-timing-function: ease-out;
  }

  details.page:has(> details.page[open] > summary:focus) > section.content {
    animation-name: page-to;
    animation-duration: 0.1s;
    animation-iteration-count: 1;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in;
  } */

  @keyframes destiny-masha {
    0% {
      transform: translateX(-10px) translateY(10px);
    }

    100% {
      transform: translateX(-20px) translateY(-20px);
    }
  }

  details.page#destiny > section.content > img#masha {
    animation-name: destiny-masha;
    animation-duration: 2s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.5, 0, 0.5, 1);
  }

  details.page#destiny > section.content > img.masha.red {
    animation-name: destiny-masha;
    animation-duration: 2s;
    animation-delay: 0.4s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.5, 0, 0.5, 1);
  }

  @keyframes destiny-flow {
    0% {
      transform: translateY(0px);
    }

    100% {
      transform: translateY(-1000px);
    }
  }

  @keyframes destiny-color {
    0%,
    30% {
      font-size: 0.7rem;
      font-weight: 300;
      line-height: 0.7rem;
      opacity: 1;
      color: rgb(0, 0, 0);
    }

    100% {
      font-size: 1.2rem;
      font-weight: 900;
      line-height: 1.5rem;
      opacity: 1;
      color: rgb(255, 0, 0);
      filter: blur(0px);
    }
  }

  @keyframes destiny-rotate {
    0% {
      rotate: -10deg;
    }

    100% {
      rotate: 10deg;
    }
  }

  details.page#destiny > section.content > div#css {
    animation-name: destiny-rotate;
    animation-duration: 3s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.5, 0, 0.5, 1);
  }

  details.page#destiny > section.content > div#css > div.color {
    animation-name: destiny-color;
    animation-duration: 4s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(1, 0, 0.5, 1);
  }

  details.page#destiny > section.content > div#css > div.color > span.flow {
    animation-name: destiny-flow;
    animation-duration: 0.6s;
    animation-iteration-count: infinite;
    animation-fill-mode: forwards;
    animation-timing-function: linear;
  }
}

@layer demonstration {
  :root {
    @layer colorscheme {
      @layer system {
        --text-color: #fff;
        --link-text-color: #7c84f7;
        --link-hover-text-color: #56b8f3;
        --link-active-text-color: #6f54d9;
        --background-color: #000;
        --invert-background-color: #fff;
        --section-background-color: #000;
        --button-background-color: #000;
        --button-text-color: #fff;
      }

      @layer pages {
        @layer page {
          --pages-page-background-color: #000;
          --pages-page-outline: 2px solid var(--invert-background-color, #fff);
        }

        @layer button {
          --pages-button-background-color: #fff;
          --pages-button-next-background-color: #fff;
          --pages-button-previous-background-color: #fff;
          --pages-button-text-color: #000;
          --pages-button-next-text-color: #000;
          --pages-button-previous-text-color: #000;
        }
      }
    }

    @layer localization {
      --localization-button-next: "Next";
      --localization-button-previous: "Previous";
    }

    color: var(--text-color, #fafafa);
    font-family: "Geologica", sans-serif;
  }

  body {
    --gap: 2rem;
    margin: unset;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--background-color, #000);
  }

  .unselectable {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
  }

  h1 {
    margin: unset;
    margin-bottom: var(--gap, 2rem);
    font-weight: 200;
  }

  strong:has(+ h1) {
    margin-left: 2.5rem;
    margin-bottom: -0.8rem;
    font-family: "Cascadia Code", sans-serif;
    font-weight: 200;
    text-decoration: line-through;
    color: red;
  }

  a {
    font-family: "Cascadia Code", sans-serif;
    text-decoration: unset;
    color: var(--link-text-color, blue);
  }

  a:hover {
    color: var(--link-hover-text-color, blue);
  }

  a:is(:active, :focus) {
    color: var(--link-active-text-color, blue);
  }

  span#current_page {
    z-index: 1000;
    margin-top: var(--gap, 2rem);
    padding: 0.4rem 1rem;
    display: flex;
    gap: 0.3rem;
    border-radius: 0.75rem;
    border: 2px solid var(--invert-background-color, #fff);
    background-color: var(--background-color, #000);
  }

  span#current_page:after {
    content: counter(page);
    font-variant-numeric: tabular-nums;
  }
}