button.css

/* ==========================================================================
   Buttons
   ========================================================================== */

/* Base button */
.media-default-skin .media-button {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: 0.5rem 1rem;
  text-align: center;
  touch-action: manipulation;
  cursor: pointer;
  user-select: none;
  outline: 2px solid transparent;
  outline-offset: -2px;
  border: none;
  border-radius: calc(infinity * 1px);
  transition-timing-function: ease-out;
  transition-duration: 150ms;
  transition-property: background-color, outline-offset, scale;
  /* Fix weird jumping when clicking on the buttons in Safari. */
  will-change: scale;

  &:focus-visible {
    outline-color: currentColor;
    outline-offset: 2px;
  }

  &:active {
    scale: 0.98;
  }

  &[disabled] {
    cursor: not-allowed;
    opacity: 0.5;
    filter: grayscale(1);
  }

  &[data-availability="unavailable"],
  &[data-availability="unsupported"] {
    display: none;
  }
}

/* Primary button variant */
.media-default-skin .media-button--primary {
  font-weight: 500;
  color: oklch(0 0 0);
  text-shadow: none;
  background: oklch(1 0 0);
}

/* Subtle button variant */
.media-default-skin .media-button--subtle {
  color: inherit;
  text-shadow: inherit;
  background: transparent;

  &:hover,
  &:focus-visible,
  &[aria-expanded="true"] {
    text-decoration: none;
    background-color: oklch(from currentColor l c h / 0.1);
  }
}

/* Icon button variant */
.media-default-skin .media-button--icon {
  display: grid;
  width: 2.25rem;
  aspect-ratio: 1;
  padding: 0;

  &:active {
    scale: 0.9;
  }

  & .media-icon {
    filter: drop-shadow(0 1px 0 var(--media-controls-current-shadow-color, oklch(0 0 0 / 0.25)));
  }
}

/* Seek button */
.media-default-skin .media-button--seek {
  & .media-icon__label {
    position: absolute;
    right: -1px;
    bottom: -3px;
    font-size: 10px;
    font-weight: 480;
    font-variant-numeric: tabular-nums;
  }

  &:has(.media-icon--flipped) .media-icon__label {
    right: unset;
    left: -1px;
  }
}

/* Playback rate button */
.media-default-skin .media-button--playback-rate {
  padding: 0;

  &::after {
    width: 4ch;
    font-variant-numeric: tabular-nums;
    content: attr(data-rate) "\00D7";
  }
}