// =============================================================================
// Step Styles
// (c) Mathigon
// =============================================================================


@import "../../styles/variables";

x-step {
  @include theme(color, $text-normal, mix(white, $dark-mode, 85%));

  display: block;
  height: 0;
  line-height: 1.7;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  position: relative;
  transform: translateX(-160px);
  word-spacing: .05em;
  z-index: 1;
  @include clearfix();

  contain: layout style;  // 'paint' breaks popups and dropdowns.

  x-course.ready & { will-change: opacity, transform; transition: opacity .8s linear, transform .8s cubic-bezier(0.165, 0.84, 0.44, 1); }
  &.on { pointer-events: auto; overflow: visible; height: auto; opacity: 1; transform: none; }

  &:hover { z-index: 2; }
  &:focus-within { z-index: 3; }
}

.reveal { visibility: hidden; }

.next-step {
  @extend .btn;
  @extend .btn-red;
  position: absolute;
  left: 50%;
  top: calc(100% + 12px);
  width: 140px;
  margin-left: -70px;
  box-sizing: border-box;
}


// -----------------------------------------------------------------------------
// Audio Narration

x-step.hovering { z-index: 1; }

p.voice {
  margin-left: -40px;
  padding-left: 40px;
}

.sentence {
  background-image: linear-gradient(rgba($yellow, 30%), rgba($yellow, 30%));
  background-repeat: no-repeat;
  background-size: 0 100%;
  transition: background .6s;
  box-decoration-break: clone;
  &.playing { background-size: 100% 100%; border-radius: 4px; padding: 0 4px; margin: 0 -4px; }
}

.playback-btn {
  position: absolute;
  width: 18px;
  height: 18px;
  margin: -4px 0 0 -38px;
  li.voice & { margin-left: -56px; }

  border: 10px solid transparent;
  background: $light-grey icon('play', white, 14) 2px 2px no-repeat;
  background-clip: content-box;
  border-radius: 30px;

  cursor: pointer;
  pointer-events: none;
  opacity: 0;
  transform: scale(0);
  transition: opacity .2s, background .2s, transform .2s;

  .voice:hover > &, &:focus, &.active { opacity: 1; transform: scale(1); pointer-events: all; }
  .voice:hover > &:hover { transform: scale(1.3); }
  &:hover, &:focus { background-color: $medium-grey; }
  &.active { background: $yellow icon('pause', white, 14) 2px 2px no-repeat; background-clip: content-box; }
}


// -----------------------------------------------------------------------------
// Step Content

x-step {
  h2, h3 { line-height: 1.15; font-weight: 600; @include theme(color, $text-dark, white); }

  h2 { margin: 2em 0 1em; font-size: 1.6em; border-bottom: 2px solid #ddd; padding-bottom: 6px; }
  .row h2 { border: none; padding: 0; }
  &:first-child h2 { margin-top: 0; }

  h3 { margin: 1.2em 0 0.8em; font-size: 1.3em; text-align: center; }
  .row h3 { text-align: left; }

  p strong, table strong, li strong { @include theme(color, $text-dark, white); font-weight: 700; }

  figure + p, x-geopad + p { margin-top: .5em; }  // TODO fix margins

  ul, ol { margin: 0 0 1em 0; padding: 0; text-align: left; }
  ul { list-style-type: disc; }
  li { margin: 0 0 0.5em 1.5em; }

  .caption {
    font-size: 0.85em;
    margin: .5em 0 0 0;
    text-align: center;
    @include theme(color, $text-light, rgba(white, 55%));
    vertical-align: top;
    line-height: 1.5;
  }

  .quote {
    font-style: italic;
    margin: 1.5em 2em;
    text-align: center;
    @include theme(color, $text-light, rgba(white, 55%));
  }

  hr { height: 2px; background: #ddd; margin: 2em 0; }
  hr:first-child { margin-top: 1em; }

  code {
    background: #eee;
    border: 1px solid $border-light;
    color: $text-dark;
    font-family: Courier, monospace;
    border-radius: 4px;
    font-size: 90%;
    padding: .2em .4em;
    vertical-align: 1px;
    margin: -.2em .1em;
  }

  pre { margin: 1em 0; }
  pre code { display: block; padding: .3em .8em; }

  table { margin: 0.5em auto 1.5em; border-collapse: collapse; border-spacing: 0; border: none; }
  td, th { text-align: center; border: none; vertical-align: middle; padding: 0.6em; }
  table.text-left td, table.text-left th { text-align: left; }
  @media screen and (max-width: $browser-small) { td, th { padding: 0.25em; } }

  td[align="left"] { text-align: left; }
  td[align="center"] { text-align: center; }
  td[align="right"] { text-align: right; }

  .table-fixed { table-layout: fixed; width: 95%; }

  .table-small, .table-tiny { margin: 0 auto 1em; }
  .table-small td { padding: .3em .6em; }
  .table-tiny td { padding: .2em .3em; }

  table.grid td, table.grid th { border-bottom: 1px solid $light-grey; border-right: 1px solid $light-grey; }
  table.grid td:last-child, table.grid th:last-child { border-right: none; }
  table.grid tr:last-child td { border-bottom: none; }

  table p { margin: 0; padding: 0; text-align: center !important; }
  table h3 { margin: 0; padding: 0; text-align: center !important; }
  table img { max-width: 95%; height: auto; }
  table .caption { text-align: center !important; }
  table .td_caption_small { padding-top: 0 !important; }

  & .row, & .column { margin: -0.5em -0.5em 0.5em; }
  & .row > *, article .column > * { width: 260px; margin: .5em; }
  & .row.padded { margin: -0.5em -24px 0.5em; }
  & .row.padded-thin { margin: -0.5em -12px 0.5em; }
  & .row > .fit { width: fit-content; }

  & .row > * > *:first-child { margin-top: 0; }
  & .row > * > *:last-child { margin-bottom: 0; }
  .row > * > p:first-child { margin-top: -6px; }

  svg { max-width: 100%; height: auto; }
}

.sticky-wrap { position: relative; }
.sticky { position: sticky; top: 54px; }

.fixme { @include theme(background, #fcc, rgba(#c00, 50%)); }

.todo {
  border: 2px solid #aaa;
  color: #999;
  max-width: 580px;
  margin: 2em auto;
  @include theme(background, #eee, rgba(white, 15%));
  padding: 22px 24px;
  border-radius: 12px;
  text-align: center;
  font-size: 20px;
  font-style: italic;
}

// Shift images that appear immediately under h2 headings
@media (min-width: 720px) { .shifted { margin-top: -70px !important; } }

x-slideshow, x-gallery, figure { margin: 2em auto; }
figure > x-img, figure > img, figure > svg { display: block; margin: 0 auto .3em; }


// -----------------------------------------------------------------------------
// Select Tabs

x-select.segmented {
  display: flex;
  margin: 0 auto .5em;
  width: fit-content;

  > * {
    width: 100px;
    text-align: center;
    border: 1px solid $red;
    border-left: none;
    transition: color .2s, background .2s;
    cursor: pointer;

    &:first-child { border-radius: 20px 0 0 20px; border-left: 1px solid $red; }
    &:last-child { border-radius: 0 20px 20px 0; }
    &:hover { background: rgba($red, 18%); }
    &.active { color: white; background: $red; cursor: default; }

    html.is-tabbing &:focus {
      box-shadow: 0 0 0 2px white, 0 0 0 4px $red;
      outline: none;
      z-index: 1;
    }
  }
}


// -----------------------------------------------------------------------------
// Coloured Frames and Boxes

.frame {
  padding: 16px;
  border-radius: 6px;
  box-sizing: border-box;
  @include theme(background, $grey-background, $dark-mode-background);
  @include theme(color, rgba(black, 70%), inherit);

  > p:last-child:not(.btn-row), > ul:last-child, > ol:last-child { margin-bottom: 0; }
  .caption { @include theme(color, rgba(black, 40%), rgba(white, 55%)); }
  hr { @include theme(background, rgba(black, 20%), rgba(white, 25%)); }

  @each $name, $color in $colors {
    &.#{$name} { @include theme(background, rgba($color, 25%), rgba($color, 40%)); }
  }
}

.box {
  @extend .frame;
  padding: 20px;
  position: relative;
  margin: 2em 0;

  // TODO Fix spacing between steps
  &.with-title { border-top-left-radius: 0; margin-top: calc(2em + 37px); }
  &.no-padding { padding: 0; }
  figure & { margin: 0; }
  figure .tabs + & { padding-top: 32px; }

  h3 {
    background: $dark-grey;
    color: white;
    height: 36px;
    line-height: 36px;
    padding: 0 20px;
    font-size: 18px;
    border-radius: 12px 12px 0 0;
    margin: 0;
    position: absolute;
    left: 0;
    top: -37px;
  }

  @media screen and (max-width: $browser-small) {
    padding-left: 24px; border-radius: 0;
    h3 { padding-left: 24px; border-top-left-radius: 0; }
  }

  @each $name, $color in $colors {
    &.#{$name} h3 { background: $color; }
  }
}

.theorem {
  @extend .frame;
  margin: 1.5em 0;
  padding: .6em 1em;
  border-left: 6px solid $red;
  border-radius: 3px 6px 6px 3px;
  @include theme(background, rgba($red, 25%), rgba($red, 40%));

  @each $name, $color in $colors {
    &.#{$name} { border-color: $color; }
  }
}


// -----------------------------------------------------------------------------
// More Typography and Inline Elements

x-step p a {
  @include inline-hover(mix($blue, white, 70%));
  color: inherit;
  padding-right: 17px;
  margin: -3px -17px -3px -6px;
  outline: none;
  &:before { right: 17px; }

  &:after {
    content: " ";
    background: inline-svg('<path fill="none" stroke="rgba(0,0,0,0.6)" stroke-width="2px" d="M2 2L6 7L2 12"/>', 8, 14);
    width: 9px !important;
    height: 14px;
    right: 5px;
    top: 7px;
    left: auto;
    opacity: 0;
    transition: opacity .1s;
    display: block;
    position: absolute;
  }
  &:hover:after, &:focus:after { opacity: 1;  }
}

.circled {
  @include circled(40px);
  background: $grey;
  color: white;

  @each $name, $color in $colors {
    &.#{$name} { background: $color; }
  }
}

.pill {
  color: white;
  display: inline-block;
  line-height: 1.5;
  padding: 0 10px;
  border-radius: 16px;
  min-width: 10px;
  text-align: center;

  background: rgba($medium-grey, 60%);
  @each $name, $color in $colors {
    &.#{$name} { background: rgba($color, 60%); }
  }

  &.step-target {
    cursor: pointer;
    transition: background .2s, box-shadow .2s;
    @include coloured-btn(rgba($medium-grey, 60%), $medium-grey);
    @each $name, $color in $colors {
      &.#{$name} { @include coloured-btn(rgba($color, 60%), $color); }
    }
  }
}

.var-action {
  @include inline-block($red);
  @include coloured-btn($red);
  @include bouncy();
  color: rgba(white, 80%);
  min-width: 20px;
  padding: 0 8px;
  transition: color .2s, background .2s, box-shadow .2s, transform .3s;
  &:hover { color: white; box-shadow: $shadow-1; }
  html.is-tabbing &:focus { outline: none; }
}

.check {
  background: $green icon('check', 'white');
  display: inline-block;
  width: 24px;
  height: 24px;
  text-align: center;
  border-radius: 100%;
  vertical-align: middle;
  visibility: hidden;
  &.incorrect { background: $red icon('cross', 'white'); }
}

.overflow-wrap {
  @include overflow-scroll();
  margin: 0 -40px;
  padding: 0 40px;
  &.overflow-table { margin: 1em -40px; }
  table { margin: .5em auto; }
}


// -----------------------------------------------------------------------------
// Print and Mobile Styles

@media screen and (max-width: $browser-small) {
  .box, figure, x-slideshow, x-gallery { margin-left: -24px; margin-right: -24px; }

  x-parallax.full-width { height: 320px; }
  figure .caption { padding: 0 24px; }
  figure x-img img, figure x-video video, .frame.fill { border-radius: 0; }

  x-slideshow .legend-box > * { padding-left: 24px; padding-right: 24px; }
  x-slideshow .back { border-top-left-radius: 0; }
  x-slideshow .next { border-top-right-radius: 0; }
  x-gallery .back { border-bottom-left-radius: 0; }
  x-gallery .next { border-bottom-right-radius: 0; }
}

@media print {
  x-step { height: auto !important; opacity: 1 !important; transform: none !important; }
  x-step > *, x-step .row { break-inside: avoid; }
  .reveal { visibility: visible !important; }
  p, strong, h2, h3, .caption { color: black !important; }
  x-gloss .popup, x-bio .popup { display: none !important; }
}