#root {
  /* Netflix preset */
  --bg-color: #000;
  --color: #ffffff00;
  --hv-color: #ffffff15;
  --text-color: #bbb;
  --border-color: #777;
  --border-hv-color: #888;
  --border-fc-color: #fff;
  --circle-color: #ffffff35;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
}

.ui-button {
  --circle-pos-x: 0;
  --circle-pos-y: 0;

  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  cursor: pointer;
  background-color: var(--color);
  font-weight: 500;
  font-size: 1rem;
  color: var(--text-color);
  padding-block: 0.5rem;
  padding-inline: 1.25rem;
  height: fit-content;
  position: relative;
  isolation: isolate;
  outline: none;
  outline-offset: 0px;

  transition: background-color 500ms ease, border 150ms ease;
}
.ui-button:focus {
  border: 1px solid var(--border-hv-color);
  background-color: var(--hv-color);
}

.ui-button:focus-visible  {
  outline: 1px solid var(--border-hv-color);
  outline-offset: 3px;
}

.ui-button::before {
  content: '';
  z-index: -1;
  position: absolute;
  background: var(--circle-color);
  width: 312%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  opacity: 0;
  left: var(--circle-pos-x);
  top: var(--circle-pos-y);

  transition: transform 200ms ease-in, opacity 300ms ease;
}

.ui-button.clicked::before {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
  transition: transform 400ms cubic-bezier(0.68, 0.08, 1, 1), opacity 150ms ease;
}