/* General styles */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

h1 {
  text-align: center;
}

button {
  background-color: white;
}

/* General styling of list as scrolling carousel */

ul {
  width: 100%;
  height: 400px;
  padding: 10px;

  overflow-x: scroll;
  scroll-snap-type: x mandatory;

  columns: 1;
  text-align: center;
}

li {
  list-style-type: none;

  display: inline-block;
  height: 100%;
  aspect-ratio: 2/3;

  background-color: #eee;
  border: 1px solid #ddd;
  padding: 20px;
  margin: 0 20px;

  text-align: left;

  view-timeline: --inertChange inline;
  animation-timeline: --inertChange;
  animation-name: inert-change;
  animation-fill-mode: both;
}

ul::column {
  scroll-snap-align: center;
}

/* Keyframes for setting inertness on pages outside the scroller */

@keyframes inert-change {
  entry 0%,
  exit 100% {
    interactivity: inert;
  }

  entry 1%,
  exit 99% {
    interactivity: auto;
  }
}

/* CSS scroll buttons */

/* Style the scroll buttons */

ul::scroll-button(*) {
  border: 0;
  font-size: 2rem;
  background: none;
  color: rgb(0 0 0 / 0.7);
  cursor: pointer;
}

ul::scroll-button(*):hover,
ul::scroll-button(*):focus {
  color: rgb(0 0 0 / 1);
}

ul::scroll-button(*):active {
  translate: 1px 1px;
}

ul::scroll-button(*):disabled {
  color: rgb(0 0 0 / 0.2);
}

ul::scroll-button(left) {
  content: "◄";
}

ul::scroll-button(right) {
  content: "►";
}

/* Position the scroll buttons */

ul {
  anchor-name: --myCarousel;
}

ul::scroll-button(*) {
  position: absolute;
  position-anchor: --myCarousel;
}

ul::scroll-button(left) {
  right: calc(anchor(left) - 70px);
  bottom: calc(anchor(top) + 21px);
}

ul::scroll-button(right) {
  left: calc(anchor(right) - 70px);
  bottom: calc(anchor(top) + 21px);
}

/* Scroll marker styling */

ul {
  /* Needed for the pseudo to be generated */
  scroll-marker-group: after;
}

/* Once tabbed to, the scroll marker group can then be moved through via the cursor keys */
/* It in effect acts as a single control for tabbing purposes */
ul::scroll-marker-group {
  position: absolute;
  position-anchor: --myCarousel;
  top: calc(anchor(bottom) - 70px);
  justify-self: anchor-center;
  display: flex;
  justify-content: center;
  gap: 20px;
}

ul::column::scroll-marker {
  content: "";
  width: 16px;
  height: 16px;
  background-color: transparent;
  border: 2px solid black;
  border-radius: 10px;
  /* This is needed because non-current targets are made inert */
  interactivity: auto;
}

ul::column::scroll-marker:target-current {
  background-color: black;
}