:host {
  --width: min(420px, 100vw);
  --aspect-ratio: 9 / 16;
  --progress-color: white;
  --progress-bg: rgb(255 255 255 / 35%);
  --progress-gap: 4px;
  --show-duration: 200ms;
  --hide-duration: 200ms;
  /* Semi-transparent backdrop so the underlying page (e.g. a product page) stays visible behind the player, but with enough darkness to focus attention on the frame. Override with `--backdrop: …` or set to `oklch(0% 0 0 / 90%)` for an opaque blackout. */
  --backdrop: var(--l-backdrop-strong);

  display: contents;
}

dialog {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: white;
  overflow: clip;

  /* Center the frame at all times. `place-items` is on the base rule so it survives the close transition (only `display` and `opacity` are transitioned with `allow-discrete`; non-transitioned properties revert immediately when `[open]` is removed and would un-center the frame to top-left for one frame). */
  place-items: center;

  /* EXIT STATE */
  opacity: 0;

  transition-property: opacity, display, overlay;
  transition-duration: var(--hide-duration);
  transition-behavior: allow-discrete;

  &::backdrop {
    background: var(--backdrop);
  }

  /* OPEN STATE */
  &[open] {
    display: grid;
    opacity: 1;
    transition-duration: var(--show-duration);
  }

  /* BEFORE-OPEN STATE */
  @starting-style {
    &[open] {
      opacity: 0;
    }
  }
}

.frame {
  position: relative;
  width: var(--width);
  max-width: 100vw;
  max-height: 100dvh;
  aspect-ratio: var(--aspect-ratio);
  background: black;
  border-radius: 0.75rem;
  overflow: clip;
  isolation: isolate;
  user-select: none;
  -webkit-user-select: none;
  touch-action: pan-y;
}

@media (max-width: 480px) {
  .frame {
    width: 100vw;
    height: 100dvh;
    aspect-ratio: auto;
    border-radius: 0;
  }
}

.video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: black;
}

/* Loading spinner — centered over the video. Delayed fade-in so a fast buffer never visibly flashes the spinner. */
.spinner {
  position: absolute;
  inset: 0;
  margin: auto;
  z-index: 1;
  width: 2rem;
  height: 2rem;
  color: white;
  pointer-events: none;
  opacity: 0;
  transition: opacity 150ms ease;
}

.spinner[data-state='loading'] {
  opacity: 1;
  /* Only paint the spinner if loading actually exceeds 200ms. */
  transition-delay: 200ms;
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    transition: none;
  }
}

.progress {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  right: 0.5rem;
  z-index: 2;
  display: flex;
  gap: var(--progress-gap);
  pointer-events: none;
}

.progress-segment {
  flex: 1 1 0;
  height: 2.5px;
  border-radius: 999px;
  background: var(--progress-bg);
  overflow: clip;
}

.progress-fill {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--progress-color);
  transform: scaleX(var(--p, 0));
  transform-origin: left;
  transition: transform 80ms linear;
}

.progress-segment[data-state='past'] .progress-fill {
  transform: scaleX(1);
}

@media (prefers-reduced-motion: reduce) {
  .progress-fill {
    transition: none;
  }
  :host {
    --show-duration: 0ms;
    --hide-duration: 0ms;
  }
}

/* Top-left header — story thumbnail + label (slot fallback) or consumer-supplied content. */
.header {
  position: absolute;
  top: 1.25rem;
  left: 0.75rem;
  right: 4rem; /* leave room for the right-side action stack */
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  min-width: 0;
  pointer-events: none;
}

.header > ::slotted(*) {
  pointer-events: auto;
}

.header-thumb {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  pointer-events: auto;
}

.header-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  pointer-events: auto;
}

.header-label {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  color: white;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Top-right vertical action stack — close, play/pause, mute. */
.actions {
  position: absolute;
  top: 1.25rem;
  right: 0.75rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
  /* 12px gap leaves room for the 6px hit-area extension on each adjacent button (see `.btn::before` below). */
  gap: 0.75rem;
  pointer-events: none;
}

.actions > ::slotted(*),
.actions .btn {
  pointer-events: auto;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgb(0 0 0 / 25%);
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background 150ms ease;

  &:hover {
    background: rgb(0 0 0 / 45%);
  }

  &:focus-visible {
    outline: 2px solid var(--progress-color);
    outline-offset: 2px;
  }

  /* WCAG 2.1 SC 2.5.5 / RGAA 13.4 — 44×44 hit area without changing the visible 32×32 disc. The pseudo carries no paint, only hit testing. */
  &::before {
    content: '';
    position: absolute;
    inset: -6px;
  }
}

.btn-nav {
  position: absolute;
  z-index: 2;
  width: 2.25rem;
  height: 2.25rem;
  font-size: 1.25rem;

  /* Chevrons start at 36×36 — 4px each side reaches 44. */
  &::before {
    inset: -4px;
  }
}

.btn-previous,
.btn-next {
  top: 50%;
  transform: translateY(-50%);
}

/* Desktop ≥ 768px: chevrons sit outside the frame, on the dim backdrop. */
@media (min-width: 768px) {
  .btn-previous {
    left: calc(50% - var(--width) / 2 - 3rem);
  }
  .btn-next {
    right: calc(50% - var(--width) / 2 - 3rem);
  }
}

/* Mobile < 768px: hide chevrons entirely — tap zones drive nav. */
@media (max-width: 767px) {
  .btn-previous,
  .btn-next {
    display: none;
  }
}

/*
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
 🆃🅰🅿  zones (invisible click/tap targets — left = previous, rest = next)
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
*/

.tap-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 0;
}

.tap-previous {
  left: 0;
  width: 30%;
}

.tap-next {
  left: 30%;
  right: 0;
}

.overlay {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 1;
  padding: 1rem;
  pointer-events: none;
}

.overlay > ::slotted(*) {
  pointer-events: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}