:root {
  --motion-fast: 150ms;
  --motion-state: 260ms;
  --motion-layout: 420ms;
  --motion-route-exit: 160ms;
  --motion-route-enter: 240ms;
  --motion-ease: cubic-bezier(.25, 1, .5, 1);
  --motion-ease-expo: cubic-bezier(.22, 1, .36, 1);
}

html { scroll-behavior: smooth; }

/* Keep persistent chrome anchored while the page content changes beneath it. */
#app { view-transition-name: app-page; }

::view-transition-old(root),
::view-transition-new(root) { animation: none; }

::view-transition-group(app-page) {
  animation-duration: 340ms;
  animation-timing-function: var(--motion-ease);
}

::view-transition-old(app-page) {
  animation: motion-route-fade-out var(--motion-route-exit) cubic-bezier(.4, 0, 1, 1) both;
}

::view-transition-new(app-page) {
  animation: motion-route-fade-in var(--motion-route-enter) var(--motion-ease) 100ms both;
}

@keyframes motion-route-fade-out {
  to { opacity: 0; }
}

@keyframes motion-route-fade-in {
  from { opacity: 0; }
}

/* The carousel shell adds controls without changing the semantic section. */
.motion-rail-shell {
  position: relative;
  min-width: 0;
}

.motion-rail-shell > .rail {
  display: block;
  padding-block: 22px 32px;
  margin-block: -22px -32px;
  overflow-x: hidden;
  overscroll-behavior-inline: contain;
  scroll-snap-type: none;
}

.motion-rail-track {
  display: flex;
  width: max-content;
  max-width: none;
  gap: inherit;
  transform: translate3d(calc(var(--motion-rail-offset, 0px) * -1), 0, 0);
  transition: transform var(--motion-layout) var(--motion-ease-expo);
}

/* A rail is a repeated rhythm: long titles must never alter card geometry. */
.motion-rail-track > .poster-card {
  flex: 0 0 168px;
  width: 168px;
  min-width: 168px;
  max-width: 168px;
}

.motion-rail-track > .landscape-card,
.motion-rail-track > .channel-card {
  flex: 0 0 254px;
  width: 254px;
  min-width: 254px;
  max-width: 254px;
}

.motion-rail-control {
  position: absolute;
  top: 50%;
  z-index: 5;
  display: grid;
  width: 42px;
  height: 58px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: rgba(8, 6, 10, .88);
  color: #fff;
  cursor: pointer;
  place-items: center;
  opacity: 0;
  transform: translateY(-50%) scale(.94);
  transition: opacity var(--motion-state) var(--motion-ease), transform var(--motion-state) var(--motion-ease), background-color var(--motion-fast) linear;
}

.motion-rail-control--previous { left: 4px; }
.motion-rail-control--next { right: 4px; }
.motion-rail-control svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; }
.motion-rail-shell:hover .motion-rail-control[aria-disabled="false"],
.motion-rail-control:focus-visible { opacity: 1; transform: translateY(-50%) scale(1); }
.motion-rail-control:hover { background: rgba(112, 0, 101, .96); }
.motion-rail-control:active { transform: translateY(-50%) scale(.94); }
.motion-rail-control[aria-disabled="true"] { opacity: 0; pointer-events: none; }

/* Streaming-card focus pull: enlargement, image depth, and useful action cue. */
.motion-card--enhanced {
  position: relative;
  z-index: 1;
  isolation: isolate;
  transform: translateZ(0);
  transform-origin: center center;
  transition: transform 340ms var(--motion-ease), filter 320ms var(--motion-ease), box-shadow 340ms var(--motion-ease);
}

/* Variant A previously combined a shorter nested image tween with an animated
   filter on the parent, which made its zoom feel less settled than B and C. */
.prototype-variant-a .motion-card--enhanced {
  backface-visibility: hidden;
  transition: transform 420ms var(--motion-ease-expo), box-shadow 380ms var(--motion-ease);
}

.prototype-variant-a .motion-card--enhanced img {
  backface-visibility: hidden;
  transition-duration: 420ms;
  transition-timing-function: var(--motion-ease-expo);
}

.motion-rail-track > .motion-card--enhanced:first-child { transform-origin: left center; }
.motion-rail-track > .motion-card--enhanced:last-child { transform-origin: right center; }

.motion-card-preview {
  position: absolute;
  inset: auto 8px 8px;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 32px;
  padding: 6px 9px;
  border-radius: 7px;
  background: rgba(8, 6, 10, .88);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .01em;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 260ms var(--motion-ease) 70ms, transform 320ms var(--motion-ease) 70ms;
  pointer-events: none;
}

.motion-card-preview__play {
  display: grid;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  color: #171018;
  font-size: 9px;
  place-items: center;
}

.poster-card__image,
.channel-card__image,
.landscape-card__image { transition: box-shadow 340ms var(--motion-ease); }

.poster-card__image::before,
.channel-card__image::before,
.landscape-card__image::before {
  content: "";
  position: absolute;
  inset: 45% 0 0;
  z-index: 2;
  background: linear-gradient(to bottom, transparent, rgba(5, 4, 7, .82));
  opacity: 0;
  transition: opacity 300ms var(--motion-ease);
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .motion-rail-track > .motion-card--enhanced:hover,
  .motion-rail-track > .motion-card--enhanced:focus-visible {
    z-index: 4;
    transform: scale(1.1) translateZ(0);
    filter: saturate(1.08) contrast(1.03);
  }

  .catalog-grid .motion-card--enhanced:hover,
  .channel-grid .motion-card--enhanced:hover {
    z-index: 3;
    transform: translateY(-5px) scale(1.035) translateZ(0);
  }

  .motion-card--enhanced:hover .motion-card-preview,
  .motion-card--enhanced:focus-visible .motion-card-preview,
  .motion-card--enhanced:hover .poster-card__image::before,
  .motion-card--enhanced:hover .channel-card__image::before,
  .motion-card--enhanced:hover .landscape-card__image::before {
    opacity: 1;
    transform: translateY(0);
  }

  .motion-card--enhanced:hover .poster-card__image,
  .motion-card--enhanced:hover .channel-card__image,
  .motion-card--enhanced:hover .landscape-card__image {
    box-shadow: 0 8px 8px rgba(0, 0, 0, .38);
  }

  .prototype-variant-a .motion-rail-track > .motion-card--enhanced:hover,
  .prototype-variant-a .motion-rail-track > .motion-card--enhanced:focus-visible {
    filter: none;
  }
}

/* Review tooling can leave the stage entirely without trapping the reviewer. */
.prototype-review-toolbar { transition: opacity var(--motion-state) var(--motion-ease); }

.prototype-controls-toggle,
.prototype-controls-restore {
  min-width: 112px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid #aeb5c2;
  border-radius: 8px;
  background: #fff;
  color: #242a35;
  font: 700 12px/1 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: .01em;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--motion-fast) linear, border-color var(--motion-fast) linear, transform var(--motion-fast) var(--motion-ease);
}

.prototype-controls-toggle { flex: 0 0 auto; margin-left: auto; }
.prototype-controls-toggle:hover,
.prototype-controls-restore:hover { border-color: #687181; background: #f2f4f7; }
.prototype-controls-toggle:active,
.prototype-controls-restore:active { transform: scale(.96); }
.prototype-controls-toggle:focus-visible,
.prototype-controls-restore:focus-visible { outline: 3px solid #2459d3; outline-offset: 2px; }

.prototype-controls-restore {
  position: fixed;
  z-index: 1000;
  bottom: max(12px, env(safe-area-inset-bottom, 0px));
  right: 12px;
  box-shadow: 0 5px 18px rgba(0, 0, 0, .28);
}

.prototype-controls-restore[hidden] { display: none; }
body.prototype-controls-hidden .prototype-review-toolbar { display: none !important; }
body.prototype-controls-hidden .topbar { top: 0; }
body.prototype-controls-hidden.prototype-bar-layout .topbar { inset-block-start: 0; }

@media (max-width: 720px) {
  .prototype-controls-toggle,
  .prototype-controls-restore { min-width: 104px; padding-inline: 12px; }
  .prototype-controls-restore { bottom: calc(76px + env(safe-area-inset-bottom, 0px)); }
}

/* Immediate feedback for every control family. */
.button,
.icon-button,
.filter-chip,
.payment-option,
.state-chip,
.prototype-state,
.toggle,
.desktop-nav a,
.mobile-nav a,
.sidebar a,
.utility-dock a {
  transition-duration: var(--motion-state) !important;
  transition-timing-function: var(--motion-ease) !important;
}

.icon-button { min-width: 44px; min-height: 44px; }
.filter-chip, .state-chip, .prototype-state { min-height: 44px; }
.broadcast-lineup__head a { min-width: 44px; min-height: 44px; }

.button:active,
.icon-button:active,
.filter-chip:active,
.payment-option:active,
.state-chip:active,
.prototype-state:active { transform: scale(.96); }

.toggle[aria-pressed="true"]::after { transform: translateX(18px); }

.filter-chip[aria-pressed="true"],
.payment-option[aria-pressed="true"] { animation: motion-select var(--motion-state) var(--motion-ease); }

@keyframes motion-select {
  50% { filter: brightness(1.12); }
}

details { interpolate-size: allow-keywords; }
details::details-content {
  block-size: 0;
  overflow: hidden;
  opacity: 0;
  transition: block-size var(--motion-layout) var(--motion-ease), opacity var(--motion-state) ease-out, content-visibility var(--motion-layout) allow-discrete;
}
details[open]::details-content { block-size: auto; opacity: 1; }

.motion-image-loading { opacity: .45; filter: saturate(.7); }
.motion-image-ready { opacity: 1; filter: none; transition: opacity var(--motion-layout) var(--motion-ease), filter var(--motion-layout) var(--motion-ease); }

.hero__art,
.broadcast-feature__art { animation: motion-hero-art 620ms var(--motion-ease) both; }

.hero__copy,
.broadcast-feature__copy { animation: motion-hero-copy 520ms var(--motion-ease) 80ms both; }

@keyframes motion-hero-art {
  from { opacity: .55; transform: scale(1.018); }
}

@keyframes motion-hero-copy {
  from { opacity: 0; transform: translateY(10px); }
}

.notice,
.empty-state,
.player-state-panel { animation: motion-feedback 340ms var(--motion-ease) both; }

@keyframes motion-feedback {
  from { opacity: .4; transform: translateY(5px); }
}

.play-button { transition: transform var(--motion-fast) var(--motion-ease), background-color var(--motion-state) var(--motion-ease); }
.play-button:hover { transform: scale(1.06); }
.play-button:active { transform: scale(.94); }

@media (max-width: 720px), (hover: none) {
  .motion-rail-control { display: none; }
  .motion-rail-shell > .rail { padding-block: 8px 16px; margin-block: -8px -16px; overflow-x: auto; scroll-snap-type: x proximity; }
  .motion-rail-track { transform: none !important; transition: none; }
  .motion-card-preview { display: none; }
  .motion-card--enhanced:active { transform: scale(.975); }
  .motion-rail-track > .poster-card { flex-basis: 128px; width: 128px; min-width: 128px; max-width: 128px; }
  .motion-rail-track > .landscape-card,
  .motion-rail-track > .channel-card { flex-basis: 218px; width: 218px; min-width: 218px; max-width: 218px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  ::view-transition-old(root), ::view-transition-new(root),
  ::view-transition-old(app-page), ::view-transition-new(app-page) { animation: none; }
  .hero__art, .hero__copy, .broadcast-feature__art, .broadcast-feature__copy { animation: none; }
  .motion-rail-shell > .rail { scroll-behavior: auto; }
  .motion-card--enhanced,
  .motion-card-preview,
  .motion-image-ready,
  .motion-rail-control,
  details::details-content {
    animation: none !important;
    transition-duration: .01ms !important;
  }
  .motion-rail-track > .motion-card--enhanced:hover,
  .motion-rail-track > .motion-card--enhanced:focus-visible,
  .catalog-grid .motion-card--enhanced:hover,
  .channel-grid .motion-card--enhanced:hover { transform: none; }
  .prototype-review-toolbar { transition: none; }
}