/* Style for the slides for AC 2020, to be used together with the
   Shower script or the b6+ script. For usage instructions, see
   https://www.w3.org/2020/Talks/ac-slides/template/Overview.html

   This is a variation of "TPAC-2019-slides.css". The logo in the
   corner is no longer square, but includes the words "AC 2020". Cover
   pages have a faint, stylized skyline of Seoul along the bottom.

   TODO: Styles for tables? blockquotes?

   A = 16/9  = aspect ratio
   N = 23    = height in em (i.e., 21 lines + 2 x 1 em padding)
   L = 5.5   = logo width in em
   H = 0.715 = logo aspect ratio (width/height)
   C = 2     = font size (and logo size) multiplier for cover pages
   w = N*A   = width of slide in em

   +---------------------------------------+-------+
   |                   1em                 |       |
   |   +-------------------------------+   |       |
   |   |                               |   |       |  ^
   |   |                               |   |       |  |
   |1em|                               |1em| 5.5em | 23em
   |   |                               |   |       |  |
   |   |                               |   |       |  v
   |   +-------------------------------+   |       |
   |                   1em                 | LOGO  |
   +---------------------------------------+-------+

   Created: 17 March 2020
   Author: Bert Bos <bert@w3.org>
*/

@font-face {
  font-family: My Gill Sans;
  font-style: normal;
  font-weight: normal;
  src: url(Gill_Sans.eot) format("embedded-opentype"),
    url(Gill_Sans.woff) format("woff")}

@font-face {
  font-family: My Gill Sans;
  font-style: normal;
  font-weight: bold;
  src: url(Gill_Sans_Bold.eot) format("embedded-opentype"),
    url(Gill_Sans_Bold.woff) format("woff")}

@font-face {
  font-family: My Gill Sans;
  font-style: oblique;
  font-weight: bold;
  src: url(Gill_Sans_Bold_Italic.eot) format("embedded-opentype"),
    url(Gill_Sans_Bold_Italic.woff) format("woff")}

@font-face {
  font-family: My Gill Sans;
  font-style: oblique;
  font-weight: normal;
  src: url(Gill_Sans_Italic.eot) format("embedded-opentype"),
    url(Gill_Sans_Italic.woff) format("woff")}

@font-face {
  font-family: LeagueGothicRegular;
  src: url(League_Gothic-webfont.woff) format('woff');
  font-weight: normal;
  font-style: normal}

/* Common layout independent of slide mode */
html {font-size: 1.156em}
body {background: url(linen.png) #595b60; counter-reset: slide; margin: 2em;
  color: white}
.slide address {font-family: Garamond Premier Pro, Garamond, serif}
.slide h1 {font: 2em/1.1 League Gothic, LeagueGothicRegular, sans-serif;
  letter-spacing: 0.03em; margin: 0 0 0.3em 0; text-transform: uppercase;
  color: #015ca4}
.slide h2 {font-size: 1.2em; font-weight: bold}
.full, .slide {width: 40.889rem; /*= w */ height: 23rem; /*= N */}
.slide {color: black; box-shadow: 0 0.4em 0.6em #000;
  word-break: normal; overflow-wrap: normal;
  font: 1em/1.6 Gill Sans MT, Gill Sans, My Gill Sans, Liberation Sans,
  DejaVu Sans, sans-serif; font-size-adjust: 0.45;
  font-variant-numeric: oldstyle-nums tabular-nums; letter-spacing: normal;
  padding: 1em 6.5em /*= L + 1 */ 1em 1em; position: relative;
  box-sizing: border-box; z-index: 0; display: inline-block;
  margin: 4em 2em 0 0; vertical-align: bottom; counter-increment: slide;
  border-radius: 0.5em;
  text-shadow: 0 0 1px white, 0 0 1px white, 0 0 1px white, 0 0 1px white;
  background: 36.389em /*= w - L + 1 */ 16.308em /*= N - L/H + 1 */
    / 3.5em /*= L - 2 */ auto url(AC-2020-slides-banner.svg) no-repeat,
    bottom right / 5.5em /*= L */ 100%
    linear-gradient(hsl(211,45%,25%), hsl(205,42%,92%)) no-repeat, #fff}
.slide:target {outline: lime solid 0.5em; outline-offset: 1em}
.slide.side {padding-left: 11.717em /*= (w - 1 - (L + 1) - 1) * 30% + 2 */}
.slide.side.right, .slide.side.r {padding-left: 1em;
  padding-right: 17.217em; /*= (w - 1 - (L + 1) - 1) * 30% + (L + 1) + 1 */}
.side .side {position: absolute; top: 4.3478% /*= 1/N */;
  left: 2.4457%; /*= 1/w */
  width: 23.764%; /*= (w - 1 - (L + 1) - 1) * 30%  / w */}
.side.right .side, .side.r .side {left: 59.606% /*= ((w - L) * 70% - 40%)/w */}
@supports (transform: translate(-50%,-50%)) {
  .side .side {top: 50%; transform: translate(-50%,-50%);
    left: 14.327%; /*= ((w - 1 - (L + 1) - 1) * 30% / 2 + 1 ) / w */}
  .side.right .side, .side.r .side {
    left: 72.221% /*= ((w - L - 1) * 85% + 30%) / w */}
}
.note {font-size: 80%}
.slide em {font-style: normal;
  background: 0 0 / 100% 100% url(data:image/png;base64,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)}
.columns > * {box-sizing: border-box;
  width: 47.005% /*= (w - L - 4)/2/(w - L - 2) */; float: right}
.columns > *:nth-child(odd) {clear: both; float: left}
.columns {overflow: hidden}
@supports (display: grid) {
  .columns {overflow: visible; display: grid; grid: "a  b" / 1fr 1fr;
     grid-gap: 0 2em}
  .columns > * {width: auto}
}
.comment {background: hsl(50,80%,90%); color: black; padding: 1em 1em;
  columns: 37em; font-family: serif; border-radius: 0.5em; margin: 4em 0 0;
  widows: 2; orphans: 2}
.comment :first-child {margin-top: 0}
img {max-width: 100%}
.num {font-variant-numeric: oldstyle-nums tabular-nums diagonal-fractions}
.slide code, .slide pre {font-family: Andale Mono, Courier, monospace}
.slide code {background: #eee; padding: 0.1em 0.3em; border-radius: 0.3em}
sub, sup {line-height: 0.5}
.slide pre {padding: 0 0.2em; background: black; color: hsl(120,100%,70%);
  text-shadow: none}
.slide ol > li {margin-left: 2em}
.slide ul > li {margin-left: 1em}
.slide ol, .slide ul {margin: 1em 0; padding: 0}
.slide li ul, .slide li ol {margin: 0}
.slide ul > li {list-style: none}
.slide ul > li::before {content: "\25A0"; display: inline-block; width: 1em;
  margin-left: -1em; color: #015ca4}

/* Own counter, because FF & Safari don't apply text-shadow to the default. */
.slide ol {counter-reset: ol; list-style: none}
.slide ol > li {counter-increment: ol}
.slide ol > li::before {/*float: left;*/ display: inline-block; width: 2em;
  margin-left: -2em; text-align: right; content: counter(ol) ".\A0"}
.slide ol > li > p:first-child {display: inline}
.slide ol[start="2"] {counter-reset: ol 1}
.slide ol[start="3"] {counter-reset: ol 2}
.slide ol[start="4"] {counter-reset: ol 3}
.slide ol[start="5"] {counter-reset: ol 4}
.slide ol[start="6"] {counter-reset: ol 5}
.slide ol[start="7"] {counter-reset: ol 6}
.slide ol[start] {counter-reset: ol calc(attr(start integer) - 1)}

/* Explicit placement on a 3x3 grid */
.place {position: absolute; box-sizing: border-box;
  max-width: 25.589%; /*= (w - 1 - (L + 1) - 2) / 3 / w */
  top: 50%; left: 43.274%; /*= ((w - 1 - (L + 1)) / 2 + 1) / w */
  transform: translate(-50%, -50%); text-align: center}
.place.t, .place.top {top: 4.3478%; /*= 1/N */ transform: translate(-50%,0)}
.place.b, .place.bottom {top: auto; bottom: 4.3478% /*= 1/N */;
  transform: translate(-50%,0)}
.place.l, .place.left {left: 2.4457%; /*= 1/w*/ transform: translate(0,-50%);
  text-align: left}
.place.r, .place.right {left: auto; right: 15.897%; /*= (L + 1)/w */
  transform: translate(0,-50%); text-align: right}
.place.t.l, .place.top.left, .place.t.r, .place.top.right, .place.b.l,
.place.bottom.left, .place.b.r, .place.bottom.right {transform: none}

/* Numbered lines in a PRE */
pre.numbered {padding-left: 2em; overflow-y: hidden; position: relative}
pre.numbered::before {color: #aaa; text-align: right; white-space: pre-line;
  text-shadow: none;
  content: "1\A 2\A 3\A 4\A 5\A 6\A 7\A 8\A 9\A 10\A 11\A 12\A 13\A 14\A 15\A 16\A 17\A 18\A 19\A 20";
  position: absolute; top: 0; left: 0; width: 1.2em; font-family: serif;
  border-right: thin solid; padding-right: 0.2em}

/* Cover pages */
.slide.cover {text-align: center;
  background: 33.639em /*= w - C * L + 1 + L/2 */ 16.308em /*= N - L/H + 1 */
      / 3.5em /*= L - 2 */ auto url(AC-2020-slides-banner.svg) no-repeat,
    bottom right / 11em /*= 2 * L */ 100%
      linear-gradient(hsl(211,45%,25%), hsl(205,42%,92%)) no-repeat,
    33% 89% / 30% auto url(shutterstock_1355922929.png) no-repeat #fff;
  padding-right: 12em /*= C * L + 1 */}
.slide.cover address {line-height: 1.3; font-size: 2em /*= C * 1 */}
.slide.cover h1 {font-size: 4em; /*= C * 2 */}

/* White-on-black pages */
.slide.white {color: white; background-color: black;
  text-shadow: 0 0 1px black, 0 0 1px black, 0 0 1px black, 0 0 1px black}
.slide.white ul > li::before,
.slide.white h1 {color: hsl(207,99%,75%)}
.slide.white code {background: #444}
.slide.white :link {color: hsl(240,100%,90%)}
.slide.white :visited {color: hsl(270,100%,90%)}

/* Full-size image overlays */
img.cover, img.fit {position: absolute; z-index: -1; top: 0; left: 0;
  width: 86.549%; /*= (w - L) / w */ height: 100%; object-fit: cover; padding: 0}
img.fit {object-fit: contain}
.cover img.cover, .cover img.fit {width: 73.098%; /*= (w - 11) / w */}

/* Slide numbers in upper right corner */
.slide::after {content: counter(slide); color: white; position: absolute;
  top: 1em; line-height: 1; font-weight: bold; right: 0; width: 5.5em /*= L */;
  text-shadow: none; text-align: center}
.slide.clear::after {content: none}

/* Layout in slide mode (when body has class=full) */
.full, .full .slide {position: absolute; overflow: hidden}
.full {top: 50%; left: 50%; background: black;
  margin: -11.5em /*= -N/2 */ 0 0 -20.444em /*= -w/2 */}
.full .slide {visibility: hidden; top: 0; left: 0; margin: 0}
.full .slide.active {visibility: visible}
.full .comment {display: none}
.full .slide:target {outline: none}

.full .progress {position: absolute; top: 0; left: 0; height: 1px;
  background: linear-gradient(to right, hsla(0,100%,50%,0),hsla(0,100%,50%,1));
  z-index: 1; transition: 0.5s}

/* Reveal elements one by one */
.full .next:not(.active) {visibility: hidden}

/* A list as a tree structure with box-drawing characters */
.tree {list-style: none; font: 1em/1 monospace;
  white-space: nowrap; padding: 0.2em 0; overflow: auto}
.tree li::before {content: none}
.tree code {background: none; font-family: Gill Sans MT, Gill Sans,
  My Gill Sans, Liberation Sans, sans-serif}
.comment .tree code {font-family: serif}

/* Takahashi method (very big text, very few words) */
.shout {font-size: 400%; line-height: 1.1}
p.shout {margin: 0.25em 0}

/* Animation of a slowly growing element */
.full .grow {transition: 3s 1s ease-in-out transform;
  position: relative; transform: scale(0.1); transform-origin: 0 50%}
.active .grow {transform: scale(1)}

/* Transitions between slides */
.full .slide.active ~ .visited {animation: none} /* Moving backwards */

.full .slide.fade-in.visited,
.fade-in .slide.visited {animation: delay 1s 1}
.full .slide.fade-in + .active:not(.visited),
.full .slide.fade-in + .comment + .active:not(.visited),
.fade-in .slide.active:not(.visited) {animation: fade-in 1s 1}
@keyframes delay {
    from {visibility: visible}
    to {visibility: visible}
}
@keyframes fade-in {
    from {opacity: 0}
    to {opacity: 1}
}
.full .slide.slide-in.visited,
.slide-in .slide.visited {animation: leftout 1s 1}
.full .slide.slide-in + .active:not(.visited),
.full .slide.slide-in + .comment + .active:not(.visited),
.slide-in .slide.active:not(.visited) {animation: leftin 1s 1}
@keyframes leftout {
    from {transform: translate(0%, 0); visibility: visible}
    to {transform: translate(-100%, 0); visibility: visible}
}
@keyframes leftin {
    from {transform: translate(-100%, 0); visibility: visible}
    to {transform: translate(0%, 0); visibility: visible}
}
.full .slide.move-left.visited,
.move-left .slide.visited {animation: leftout 1s 1}
.full .slide.move-left + .active:not(.visited),
.full .slide.move-left + .comment + .active:not(.visited),
.move-left .slide.active:not(.visited) {animation: rightin 1s 1}
@keyframes rightin {
    from {transform: translate(100%, 0); visibility: visible}
    to {transform: translate(0%, 0); visibility: visible}
}
.full .slide.move-up.visited,
.move-up .slide.visited {animation: topout 1s 1}
.full .slide.move-up + .active:not(.visited),
.full .slide.move-up + .comment + .active:not(.visited),
.move-up .slide.active:not(.visited) {animation: bottomin 1s 1}
@keyframes topout {
    from {transform: translate(0, 0%); visibility: visible}
    to {transform: translate(0, -100%); visibility: visible}
}
@keyframes bottomin {
    from {transform: translate(0, 100%); visibility: visible}
    to {transform: translate(0, 0%); visibility: visible}
}
.full {perspective: 1000px; perspective: 1000}
.full .slide.flip-up.visited,
.flip-up .slide.visited {animation: turn-down 1s 1 ease-in}
.full .slide.flip-up + .active:not(.visited),
.full .slide.flip-up + .comment + .active:not(.visited),
.flip-up .slide.active:not(.visited) {animation: turn-up 1s 1 ease-out}
@keyframes turn-down {
    from {transform: rotateX(0deg); visibility: visible}
    50%, to {transform: rotateX(90deg); visibility: hidden}
}
@keyframes turn-up {
    from, 50% {transform: rotateX(-90deg); visibility: visible}
    to {transform: rotateX(0deg); visibility: visible}
}
.full .slide.flip-left.visited,
.flip-left .slide.visited {animation: flip-left1 1s 1 ease-in}
.full .slide.flip-left + .active:not(.visited),
.full .slide.flip-left + .comment + .active:not(.visited),
.flip-left .slide.active:not(.visited) {animation: flip-left2 1s 1 ease-out}
@keyframes flip-left1 {
    from {transform: rotateY(0deg); visibility: visible}
    50%, to {transform: rotateY(-90deg); visibility: hidden}
}
@keyframes flip-left2 {
    from, 50% {transform: rotateY(90deg); visibility: visible}
    to {transform: rotateY(0deg); visibility: visible}
}
.full .slide.center-out.visited,
.center-out .slide.visited {animation: gray 1s 1}
.full .slide.center-out + .active:not(.visited),
.full .slide.center-out + .comment + .active:not(.visited),
.center-out .slide.active:not(.visited) {animation: center-out 1s 1}
@keyframes gray {
    from, to {opacity: 0.5; visibility: visible}
}
@keyframes center-out {
    from {clip-path: circle(0)}
    to {clip-path: circle(100%)}
}
.full .slide.wipe-left.visited,
.wipe-left .slide.visited {animation: gray 1s 1}
.full .slide.wipe-left + .active:not(.visited),
.full .slide.wipe-left + .comment + .active:not(.visited),
.wipe-left .slide.active:not(.visited) {animation: rightin 1s 1}

.full .slide.zigzag-left.visited,
.zigzag-left .slide.visited {animation: gray 1s 1}
.full .slide.zigzag-left + .active:not(.visited),
.full .slide.zigzag-left + .comment + .active:not(.visited),
.zigzag-left .slide.active:not(.visited) {animation: zigzag-left 1s 1}
@keyframes zigzag-left {
    from {clip-path:
      polygon(120% 0%, 120% 0%, 100% 30%, 120% 60%, 110% 100%, 120% 100%)}
    to   {clip-path:
      polygon(120% 0%,   0% 0%, -20% 30%,   0% 60%, -10% 100%, 120% 100%)}
}
.full .slide.zigzag-right.visited,
.zigzag-right .slide.visited {animation: gray 1s 1}
.full .slide.zigzag-right + .active:not(.visited),
.full .slide.zigzag-right + .comment + .active:not(.visited),
.zigzag-right .slide.active:not(.visited) {animation: zigzag-right 1s 1}
@keyframes zigzag-right {
    from {clip-path:
      polygon(-20% 0%,  -20% 0%, 0% 30%,  -20% 60%, -10% 100%, -20% 100%)}
    to   {clip-path:
      polygon(-20% 0%, 100% 0%, 120% 30%, 100% 60%, 110% 100%, -20% 100%)}
}
.full .slide.cut-in.visited,
.cut-in .slide.visited {animation: gray 1s 1}
.full .slide.cut-in + .active:not(.visited),
.full .slide.cut-in + .comment + .active:not(.visited),
.cut-in .slide.active:not(.visited) {animation: cut-in 1s 1}
@keyframes cut-in {
  from {transform: translate(-100%, -100%)}
  to {transform: translate(0%, 0%)}
}

/* Not sure why Shower makes a section with class=region... */
section.region {display: none}


@page {
  margin: 1cm;
}
@media print {
  html {font-size: 10pt}
  body {background: none; margin: 0; columns: 41em}
  .slide {border: 0.5pt solid black; margin: 1em 1em 1em 0; display: block;
    overflow: hidden}
  ul {margin: 0.9em 0} /* Compensate slight differences in fonts & margins */
}