style.css

/* Defaults for some new HTML5 elements for older browsers */
header, nav, section, aside, main, footer, details {display: block}
summary {display: list-item}
header {font-weight: bold}

* {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}


html,
body {
  background: #fff;
}

html {
  font-size: 14px;
  padding: 3em;
}

body {
  border-radius: .6em;
  color: #333;
  font: 1.1em/1.3 Helvetica, Arial, Verdana, sans-serif;
  hyphens: manual;
  margin: 0 auto;
  max-width: 65em;
  padding: 1em;
}

.header :first-child {
  margin-top: 0;
}


.footer :last-child {
  margin-bottom: 0;
}

h1,
h2,
h3,
h4,
h5,
p,
dl,
ul,
ol {
  margin: 1.5rem 0;
}

h3 {
  margin-top: 4rem;
}

h2 + h3,
h2 + section > h3 {
  margin-top: 1.5rem;
}

h4 {
  margin-top: 3rem;
}

h3 + h4,
h3 + section > h4 {
  margin-top: 1.5rem;
}

ol {
  margin-left: 1.1em;
}

a,
h1,
h2,
.menu a.active-tab {
  color: #005a9c;
}

a:hover {
  color: #111;
}

a.ref,
.has-ref {
  cursor: pointer;
}

p.has-ref {
  cursor: initial;
}

a.ref {
  color: inherit;
  display: none;
  font-size: 1em;
  left: 0;
  opacity: .25;
  position: absolute;
  text-decoration: none;
}

.has-ref:hover > a.ref {
  display: block;
}

.has-ref:target > a.ref {
  display: block;
  opacity: .5;
}

.has-ref {
  margin-left: -1em;
  padding-left: 1em;
  position: relative;
}

.graphic {
  height: 13em;
  margin: 0 -1.5em;
  overflow: hidden;
  position: relative;
}

.graphic img {
  bottom: 0;
  height: 100%;
  left: 0;
  position: absolute;
  width: 100%;
}

.box,
.type {
  box-shadow: .3em .3em 0 rgba(0,0,0,.1);
  border: 1px solid #ccc;
  margin-top: 0;
}


/* Each section has a link to the next section, or to the top of the
   page. The link is inside an element (usually <p>) with
   class=skip.

   Inside the banner (<header>), the link is nearly transparent unless
   it has the focus, because that looks better. It remains visible for
   a second after it lost the focus again.

   The maximum width of a normal section is 52rem/20em minus a bit for
   the scrollbar, hence we set the maximum width of the .skip to a
   little less than 20em.

   Skip-arrows have a color depending on the section background. Give
   them a 1-pixel outline so they are visible in case they are on top
   of an image.
*/
.skip {position: absolute; top: -3.6rem; right: 0; color: #c9242b; width: 100%;
  z-index: 1;
  max-width: 19.7em; text-align: right; font-size: 2em; margin: 0; height: 0}
section:nth-of-type(2n+1) .skip {color: black;
  text-shadow: -1px -1px 0 hsl(0,0%,98%), 1px 1px 0 hsl(0,0%,98%),
    -1px 1px 0 hsl(0,0%,98%), 1px -1px 0 hsl(0,0%,98%)}
section:nth-of-type(2n+2) .skip {color: white;
  text-shadow: -1px -1px 0 #005a9c, 1px 1px 0 #005a9c,
    -1px 1px 0 #005a9c, 1px -1px 0 #005a9c}
footer .skip {color: black;
  text-shadow: -1px -1px 0 #eee, 1px 1px 0 #eee,
    -1px 1px 0 #eee, 1px -1px 0 #eee}
@media (min-width: 46em) and (min-height: 46em), (min-width: 56em) {
  .skip {top: -7.2rem}}
header .skip {top: -1.2rem; z-index: 2}
.skip a span {display: none} /* Suppress text meant for Lynx */
.skip a {text-decoration: none}
header .skip a {opacity: 0.1; transition: 1s 1s}
header .skip a:hover, header .skip a:focus {opacity: 1; transition: 0.2s;
  background: #ccc}
@supports (transform: translate(50%, 0)) {
  .skip {right: 50%; transform: translate(50%, 0)}
}
.skip {display: none}   /* No skip link on small screens */
@media screen and (min-width: 33em) {.skip {display: block}}

/* If you rather clip than squeeze the image, remove `height: 100%`. */
.box {
  clear: right;
  color: #666;
  float: right;
  font-size: 1rem;
  margin-left: 3rem;
  margin-bottom: 2rem;
  padding: 1em;
  width: 19em;
  background-color: #f2fdff;
}

.box h2 {
  font-size: 1.2rem;
  line-height: 1.4;
  margin: 0;
}

.box *:last-child {
  margin-bottom: 0;
}

.box.compact p {
  margin-top: 0;
  margin-bottom: 0;
}
.box.compact ul {
  margin-top: 0;
}

#sponsoring {
  background-color: white;
}

#sponsoring p {
  text-align: center;
}

.small {
  color: #777;
  font-size: 1rem;
}

.image-paragraph-host {
  margin-bottom: .75em;
}

.image-paragraph {
  margin: 0;
}

.image-link {
  display: block;
}

.image-link img {
  max-width: 225px;
  padding: 2.5vmin 0;
  width: 100%;
}

.footer {
  border-top: 1px solid #eee;
  clear: both;
  color: #777;
  font-size: 1rem;
  margin: 2rem 0;
  padding-top: .5rem;
}

.menu {
  background: #005a9c;
  font-size: 1rem;
  margin: 0 0 2em;
}

.menu,
.menu ul,
.menu li {
  width: 100%;
}

.menu ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu li + li a {
  border-left: 2px solid #fff;
}

.menu a {
  color: #eee;
  display: block;
  font-size: .95rem;
  height: 100%;
  padding: .6rem;
  text-align: center;
  text-decoration: none;
  transition: .05s background ease-in-out, .05s color ease-in-out;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  width: 100%;
}

.menu a:hover {
  background: #111;
  color: #fff;
}

.menu a:active {
  opacity: .75;
}

.menu a.active-tab {
  background: #fff;
  font-weight: bold;
  pointer-events: none;
  border-top: solid thin #005a9c;
  border-bottom: solid thin #005a9c;
}

ul {
  list-style: square;
  margin-left: 0;
  padding-left: 1em;
  margin-top: 0;
}

ul ul {
  margin-bottom: 0;
}

blockquote {
  margin-left: 1em;
}

.main {
  margin-top: 3rem;
}

dd {
  margin: 0 0 .6em;
}

dt {
  font-weight: 700;
  margin-top: 1rem;
}

.main dt {
  margin-top: 2rem;
}

img {
  display: inline-block;
  max-width: 100%;
}

h1,
h2,
h3,
h4 {
  break-after: avoid;
}

.main h2 {
  margin-top: 1.5em;
}

address {
  line-height: .25em;
}

@media all and (min-width: 699px) {
  html {
    background: #005a9c;
  }
}

@media all and (max-width: 860px) {
  html {
    padding: 0;
  }

  body {
    border-radius: 0;
  }

  .menu ul {
    display: block;
  }

  .menu li + li a {
    border-top: 2px solid #fff;
    border-left: 0;
  }

  .menu li + li a {
    margin-left: 0;
  }

  .graphic {
    height: 10em;
    margin: 0;
  }

  /* The right-floating boxes become normal blocks. */
  .box {
    float: none;
    margin-left: 0;
    width: auto;
  }
}

@page {
  margin: 2cm;
}

@media print {
  html {
    background: none;
    padding: 0;
  }

  body {
    background: none;
    border-radius: 0;
    padding: 0;
  }
}

/* Initialize footnote counters. */
body {
  counter-reset: footnote_counter footnote-ref_counter;
}

h2.footnote {
  counter-increment: footnote_counter;
}

a.footnote-ref {
  counter-increment: footnote-ref_counter;
  text-decoration: none;
}

h2.footnote:before {
  content: counter(footnote_counter);
  display: block;
  float: left;
  font-size: .9em;
  margin-right: 1.25ch;
  padding: 2em 4em;
  vertical-align: top;
}

h2.footnote:after {
  clear: both;
  content: "";
  display: block;
}

a.footnote-ref:after {
  content: counter(footnote-ref_counter);
  font-size: .6em;
  margin-left: .25em;
  vertical-align: super;
}

h2.footnote:before,
a.footnote-ref:after {
  background-color: #005a9c;
  border-radius: 50%;
  color: #fff;
  font-weight: 700;
  padding: .1em .5em;
}

.schedule {
  list-style: none;
}

.schedule li,
summary .desc {
  display: flex;
}

.schedule li + li {
  margin-top: .5rem;
}

summary .time {
  background-color: #005c9c;
  border-radius: 5px 0 0 5px;
  color: #fff;
  display: block;
  font-weight: bold;
  margin-bottom: 5px;
  min-width: 8em;
  vertical-align: top;
  white-space: nowrap;
}

summary .time,
.title,
.type {
  padding: 3px 6px;
}

.break summary .time {
  background-color: #666;
  color: #fff;
}

.break .title {
  color: gray;
  font-style: italic;
}

summary .time span { font-size: 67%; }

.type {
  clear: right;
  display: inline-block;
  font-size: 67%;
  font-weight: normal;
  height: 100%;
  margin: 0 13px 0 0;
  order: -1;
  min-width: 6.4em;
}

.type:empty {
  border-color: transparent;
  box-shadow: none;
}

dt.type {
  font-size: 100%;
  margin: 0;
}

.type-lightning {
  background-color: #ffe7ba;
}

.type-plenary {
  background-color: #b9d3ee;
}

.type-breakout {
  background-color: #c0d9af;
}

.type-workshop {
  background-color: #ffe4e1;
}

span.title {
  display: block;
  flex: 1;
  margin-left: 5px;
  order: 1;
}

summary {
  display: block;
}

summary::-webkit-details-marker {
  display: none;
}

li:not(.no-details) details summary .desc {
  cursor: pointer;
}

details summary .desc:before {
  color: #999;
  content: "▶";
  display: inline-block;
  height: 18px;
  margin-right: 8px;
  order: -2;
  width: 18px;
}

details[open] summary .desc:before {
  color: #666;
  transform: rotate(90deg);
  position: relative;
  left: -2px;
  top: 5px;
}

.no-details details .desc:before {
  content: "";
}

details,
.no-details details:hover {
  opacity: .9;
}

details summary {
  outline: none;
}

details:hover,
details[open] summary {
  opacity: 1;
}

.schedule details {
  width: 100%;
}

.schedule details dl {
  box-shadow: .3em .3em 0 rgba(0,0,0,.1);
  border: 1px solid #ccc;
  margin: 9px 0 5px 27px;
  padding: 1rem;
  position: relative;
}

/* from http://nicolasgallagher.com/pure-css-speech-bubbles/demo/ */
.schedule details dl::after {
  border-color: #005c9c transparent;
  border-style: solid;
  border-width: 15px 15px 0;
  content: "";
  display: block;
  left: 8em;
  position: absolute;
  top: -16px;
  width: 0;
}

.schedule details dt {
  margin: 0;
}

.schedule details dd {
  margin: 0 0 0 1rem;
}

.schedule details dd span {
  font-size: 75%;
  color: #888;
  display: block;
  margin-bottom: .25em;
}

.schedule details dd + dt {
  margin-top: 1rem;
}

.format {
  margin-bottom: 2.25rem;
}

.format dt {
  font-size: 1.1rem;
  /*font-weight: 600;*/
  margin: .5rem 0 1.25rem;
  padding: .5rem 1rem;
}

.format dd {
  margin: 0 1rem 1.5rem;
}

#sponsors p {
  margin-left: 1em;
}

.sponsors-section {
  margin-top: 1rem;
}

.sponsors-section :first-child {
  margin-top: 0;
}

.sponsors-section :last-child {
  margin-bottom: 0;
}

#notification {
  background-color: #ff0;
  border: 1px solid #ccc;
  box-shadow: .2em .4em .5em #888;
  color: #666;
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 1em;
  padding: .3em;
  text-align: center;
}

.concluded {
  text-decoration: line-through;
}

@media print {
  h1 {
    background: none;
    color: #111;
  }

  nav, aside {
    display: none;
  }

  body,
  article {
    margin: 0;
    padding: 0;
    width: 100%;
  }

  @page {
    margin: 2cm;
  }

  h2, h3 {
    page-break-after: avoid;
  }

  article {
    page-break-before: always;
  }

  ul, img {
    page-break-inside: avoid;
  }

  #dates {
    display: none;
  }
}

cite {
  font-weight: bold;
}

.phone {
  text-indent: -1em;
  margin-left: 2em;
  margin-top: 0;
  margin-bottom: 0;
}

.phone cite {
  padding: 3px 0;
  margin: 0;
  padding-left: 0;
  border-left: none;
  font-weight: bold;
}

.irc {
  padding: 0.3em;
  background-color: #eee;
}

.irc cite {
  padding: 3px 0;
  margin: 0;
  padding-left: 0;
  border-left: none;
  font-weight: bold;
}

ol ol {
  margin: 1.5rem;
  margin-top: 0;
  margin-bottom: 0;
}

.note {
  background: #c0d9af;
  box-shadow: 10px 5px 3px 0px gray;
  border-width: thin;
  border-style: thin;
  border-radius: 3px;
  max-width: 400px;
  padding: 1rem;
}

.note p {
  margin: 0;
}

.note ul {
  margin-bottom: 0;
}

.warning {
  box-shadow: 10px 5px 3px 0px gray;
  border-top-width: thin;
  border-right-width: thin;
  border-bottom-width: thin;
  border-left-width: thin;
  border-top-style: solid;
  border-right-style: solid;
  border-bottom-style: solid;
  border-left-style: solid;
  border-radius: 3px;
  width: 80%;
  padding-top: 0.5em;
  padding-right: 0.5em;
  padding-bottom: 0.5em;
  padding-left: 0.5em;
}

.warning h1 {
  font-size: 120%;
  font-style: italic;
  font-weight: bold;
  text-align: center;

}

.warning p {
  font-size: 110%;
}

.todo {
  color: #900;
  background-color:#FFC !important;
  font-style: italic;
}

#banner .banner-title {
  position: relative;
  background: url('media/timeline-thin-sm.jpg') no-repeat 100% 100%;
  background-size: auto 100%;
  height: 308px;
}

#banner h1 {
  position: absolute;
  right: 0;
  width: min(16em, 100%);
  margin: 0;
  color: white;
  text-align: right;
  font-size: min(180% + 1vw, 240%);
  line-height: 1.4;
  padding: 1em;
}
#banner h1+p {
  margin-top: 0;
}

button {
  font-size: 75%;
  padding: 0.3em;
}

a.char {
  text-decoration: none;
}

ul.detailed {
  list-style: none;
  padding-left: 0;
}

ul.detailed li:not(.no-details) details summary {
  color: #333;
  cursor: pointer;
}

ul.detailed li:not(.no-details) details summary:before {
  color: #333;
  content: "▶";
  display: inline-block;
  height: 18px;
  margin-right: 8px;
  order: -2;
  width: 18px;
}

ul.detailed details[open] summary {
  text-decoration: underline;
}

ul.detailed li:not(.no-details) details[open] summary:before {
  transform: rotate(90deg);
  position: relative;
  left: -2px;
  top: 5px;
}

ul.detailed .no-details details[open] summary {
  margin-bottom: 1em;
}

ul.detailed .no-details summary:before {
  color: #333;
  content: "⏹";
  display: inline-block;
  height: 18px;
  margin-right: 8px;
  order: -2;
  width: 18px;
}

ul.detailed dl, ul.detailed ul {
  margin-top: 0;
}
ul.detailed dt {
  margin-top: 0.5em;
}

ul.detailed details {
  opacity: 1;
}

table {
  border-collapse: collapse;
}

th, td {
  border: thin solid #00365C;
  padding: 0.5em;
  vertical-align: top;
}

th:nth-child(1) {
  width: 150px;
}

th {
  background-color: #005a9c;
  color: white;
}

figure {
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.attribution {
  font-size: small;
  text-align: right;
  margin-top: 0;
  margin-bottom: 0;
  color: #333;
}

dfn {
  font-weight: bolder;
}

label:before, label:after {
  content: "\a";
  white-space: pre;
}

input, textarea {
  width: 100%;
  font: .9em/1.1 Helvetica, Arial, Verdana, sans-serif;
}

input[type=checkbox] {
  width: initial;
}

button {
  margin: 20px 0 0 0;
  width: 100%;
}


div.talks > details {
  border: 1px solid #ccc;
  border-radius: .6em;
  box-shadow: .3em .3em 0 rgba(0,0,0,.1);
  margin-top: 20px;
  padding: 1em;
}

div.talks > details > summary > div {
  display: flex;
  height: 150px;
}

div.talks > details > summary > div > div {
  flex-grow: 1;
}

div.talks > details > summary img {
  flex-basis: 100px;
  object-fit: cover;
  object-position: center top;
  border-radius: .6em;
}

div.talks > details > summary {
  position: relative;
  list-style: none;
}

div.talks > details > summary::-webkit-details-marker {
  display: none;
}

div.talks h4 {
  cursor: pointer;
}

div.talks > details > summary > div:after {
  content: 'more ►';
  position: absolute;
  left: 0;
  bottom: -10px;
  cursor: pointer;
  color: gray;
  display: none;
}

@media all and (min-width: 620px) {
  div.talks > details > summary > div:after {
    display: block;
  }
}

div.talks > details > summary.nopicture > div:after {
  right: 10px;
}

div.talks > details[open] > summary > div:after {
  content: 'less ▼';
  cursor: pointer;
}

div.talks > details[open] > summary img {
  display: none;
}

div.talks .button {
  padding: .5em;
  margin-top: 1em;
  background: #005a9c;
  border: none;
  font-size: 1.2rem;
  color: white;
  box-shadow: .2em .3em .4em #888;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 8em;
  text-decoration: none;
}

div.talks .button:not([href]) {
  background: rgb(240,240,240);
  color: rgb(100,100,100);
}

div.talks h4 {
  color: #005a9c;
  font-size: 1em;
  margin-top: 0;
  margin-bottom: 0;
}

@media all and (min-width: 500px) {
  body {
    padding: 3em;
  }

  div.talks h4 {
    font-size: 1.3em;
  }
}

div.talks dt {
  margin: 0;
}

div.talks dd {
     margin: 0;
     padding-left: 1rem;
}

div.talks dd + dd { font-style: italic;}

div.talks dd + dt {
  padding-top: 1rem;
}

div.talks .speaker {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-style: italic;
}

div.talks .speaker img {
  order: 2;
  margin-top: 1.5rem;
  margin-left: 1rem;
  border-radius: .6em;
}

@media all and (min-width: 600px) {
  div.talks .speaker {
    flex-direction: initial;
    align-items: initial;
  }
}

div.talks .speaker span {
  font-weight: bold;
}

[data-action=toggle] button {
  width: 300px;
  margin-top: 0;
  height: inherit;
}

.picto::before {
  font-family: iconmonstr-iconic-font;
  font-size-adjust: 1.0;
  line-height: 0.6;
  font-style: normal;
  margin-right: 0.33em;
  vertical-align: middle;
  text-indent: 0;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.buttons, .badges {
  overflow: visible;
  display: grid;
  grid: "a b" / 1fr 1fr;
  grid-gap: 2px;
  gap: 2px;
  align-items: stretch;
  justify-items: stretch;
}

@media all and (min-width: 33em) {
  .buttons, .badges {
    grid: "a b c" / 1fr 1fr 1fr;
  }
}

#slides button {
  background: hsla(204,0%,86%,1.0);
  border: 1px outset hsla(204,0%,86%,1.0);
  max-width: 13em;
  color: inherit;
  font-weight: normal !important;
  min-height: 2.5em;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  margin-top: 1rem;
  cursor: pointer;
}

.buttons > * {
  background: hsla(204,0%,86%,1.0);
  border: 1px outset hsla(204,0%,86%,1.0);
  color: inherit;
  font-weight: normal !important;
  min-height: 2.5em;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.buttons > *, .badges > * {
  width: auto;
  margin: 0;
  float: none;
}

.buttons a {
  text-decoration: none;
}

#slides button:hover,
.buttons button:hover,
.buttons a:hover,
body:not(.sync) #buttonbar .button:hover {
  filter: brightness(105%);
}

.talk #intro h2 {
  font-size: 2em;
}

.talk summary {
  display: list-item;
}

.talk details ul {
  margin-top: 1em;
  margin-left: 1em;
}

i-slide {
  width: 40.889em;
  max-width: 100%;
  border-radius: 5px;
  outline: thin solid #444;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

iframe {
  margin-left: auto !important;
  margin-right: auto !important;
  border-radius: 5px;
}

#slides > div {
  width: 40.889em;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
}

body:not(.sync) #buttonbar {
  width: 40.889em;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.sync #buttonbar button {
  font-size: inherit;
  margin: inherit;
}

body:not(.sync) #buttonbar .button, body:not(.sync) #buttonbar button,
.buttons .button, .buttons button {
  text-decoration: none;
  cursor: default;
  letter-spacing: normal;
  word-spacing: normal;
  text-align: center;
  border-radius: 0.25em;
  background: hsla(204,0%,86%,1.0) padding-box;
  color: inherit;
  border: 1px outset hsla(204,0%,86%,1.0);
}

#buttonbar label:before, #buttonbar label:after {
  content: "";
}

#buttonbar [title="Help"] {
  display: none;
}

#buttonbar label {
  padding: 0.3em;
}

.button > input {
  vertical-align: initial;
}

.sync.noslides #slidenr {
  display: none;
}

.sync.noslides #video {
  position: initial;
  margin-top: 6em;
  margin-bottom: 1em;
  display: block;
}

.sync.noslides #caption {
  position: initial;
  margin-left: auto;
  margin-right: auto;
}

.sync.noslides #buttonbar span:nth-child(2) {
  display: none;
}

.related {
  background-color: #C2CDCF;
  border-radius: .6em;
  padding: 1em;
  width: 40.889em;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 1.5rem;
}

.sync .related {
  display: none;
}

#toc ul {
  margin-bottom: 0;
}

.back-to-toc {
  text-align: right;
  clear: both;
}

header #translations {
  float: right;
}