/* CSS reset by https://piccalil.li/blog/a-more-modern-css-reset/ */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Prevent font size inflation */
html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
}

/* Remove default margin in favour of better control in authored CSS */
body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
    margin-block-end: 0;
}

/* Remove list styles on ul, ol elements with a list role, which suggests default styling will be removed */
ul[role='list'],
ol[role='list'] {
    list-style: none;
}

/* Set core body defaults */
body {
    min-height: 100vh;
    line-height: 1.5;
    margin: 0;
}

/* Set shorter line heights on headings and interactive elements */
h1,
h2,
h3,
h4,
button,
input,
label {
    line-height: 1.1;
}

fieldset{
    display: block;
    border: none;
    padding: 0;
    margin: 0;
}

/* Balance text wrapping on headings */
h1,
h2,
h3,
h4 {
    text-wrap: balance;
}

/* A elements that don't have a class get default styles */
a:not([class]) {
    text-decoration-skip-ink: auto;
    color: currentColor;
}

/* Make images easier to work with */
img,
picture {
    max-width: 100%;
    display: block;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

/* Make sure textareas without a rows attribute are not tiny */
textarea:not([rows]) {
    min-height: 10em;
}

/* Anything that has been anchored to should have extra scroll margin */
:target {
    scroll-margin-block: 5ex;
}

dl{
    display: grid;
    grid-template-areas: "title desc" ;
}

.visually-hidden {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Tabs */
.tablist{
    height: 100%;
    display: grid;
    grid-template: "tablist" "panel";
    grid-template-rows: 2em 1fr;
}

.controls{
    background: #ccc;
}

.control {
  display: inline-block;
}

.control label {
    padding: .5em 1em;
}

input[type="radio"]:checked + label {
  background: #000;
  color: #fff;
}

a:focus,
input:focus,
input[type="radio"]:focus + label {
  outline: 2px dotted;
  outline-offset: 2px;
}

input[type="radio"] + label:hover {
  cursor: pointer;
  text-decoration: underline;
}

.panel {
    background: #eee;
    padding: 1em;
}


/* Layout */
main {
    width: 100%;
    height: 100vh;
    display: grid;
    grid-template-areas: "video tabs" "timeline timeline";
    grid-template-columns: 50% 50%;
    grid-template-rows: 50% 50%;
    gap: 1em;
}

main>div {
    background: purple;
}

#video {
    grid-area: video;
}

#tabs {
    grid-area: tabs;
}

#timeline {
    grid-area: timeline;
    position: relative;
}

#timeline-bar{
    height: 2em;
    margin-left: 20em;
    background: #aaa;
}

#timeline-bar-ctrl{
    display: inline-block;
    background: #000;
    width: .1875em;
    height: 100%;
    position: absolute;
}

#timeline-bar-ctrl::before{
    content: '';
    width: 2em;
    height: 2em;
    border-radius: 50%;
    transform: translate3d(-50%, 0px, 0px);
    background: #000;
    position: absolute;
}

#tracks{
    height: calc(100% - 2em);
    overflow-y: scroll;
}

.track {
    background: #ccc;
    width: 100%;
    min-height: 15em;
    display: grid;
    grid-template: 100% / 20em 1fr;
}

.track + .track {
    border-top: 1px solid #fff;
}

.track-ctrl{
    background: #ccc;
}

.track-viz{
    background: #eee;
}