/* Motion-lesson player: a video-like stage inside the academy lesson shell. */
.motion-player {
  --mp-teal: #78e1d5;
  --mp-gold: #e8bd7d;
  --mp-ink: #060b13;
  --mp-text: #edf2ed;
  --mp-muted: #94a8b9;
  position: relative;
  width: min(100%, calc((100vh - 210px) * 16 / 9));
  margin: 0 auto;
  outline: none;
}
.motion-stage {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  overflow: hidden;
  border-radius: 16px;
  background: #000;
  border: 1px solid #1f2c33;
  box-shadow:
    0 30px 80px -30px #000c,
    0 0 0 1px #0006 inset;
  isolation: isolate;
}
.motion-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
}
.motion-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--mp-muted);
  font-size: 14px;
  letter-spacing: 2px;
  background: var(--mp-ink);
}

/* Big play button (start / paused). */
.motion-bigplay {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 96px;
  height: 96px;
  margin: -48px 0 0 -48px;
  border-radius: 50%;
  border: 1.5px solid #78e1d5aa;
  background: #06101499;
  backdrop-filter: blur(6px);
  cursor: pointer;
  transition:
    transform 0.25s ease,
    background 0.25s ease;
  z-index: 3;
}
.motion-bigplay span {
  position: absolute;
  left: 38px;
  top: 30px;
  width: 30px;
  height: 36px;
  background: var(--mp-teal);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}
.motion-bigplay:hover {
  transform: scale(1.06);
  background: #0a1a1ecc;
}
.motion-bigplay[hidden],
.motion-soundhint[hidden],
.motion-end[hidden] {
  display: none;
}

.motion-soundhint {
  position: absolute;
  right: 16px;
  top: 16px;
  z-index: 3;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid #78e1d566;
  background: #060b13cc;
  color: var(--mp-text);
  font: 500 13px/1 inherit;
  letter-spacing: 1px;
  cursor: pointer;
  backdrop-filter: blur(6px);
}
.motion-soundhint span {
  color: var(--mp-teal);
  margin-right: 4px;
}

/* Controls overlay. */
.motion-hud {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 44px 18px 10px;
  background: linear-gradient(transparent, #03070cdd 70%);
  opacity: 1;
  transition: opacity 0.35s ease;
}
.motion-player.is-playing:not(.hud-awake) .motion-hud {
  opacity: 0;
}
.motion-player.is-playing:not(.hud-awake) .motion-canvas {
  cursor: none;
}
.motion-player:focus-within .motion-hud {
  opacity: 1;
}
.motion-scrub {
  position: relative;
  height: 22px;
}
.motion-track {
  position: absolute;
  left: 0;
  right: 0;
  top: 9px;
  height: 4px;
  display: flex;
  gap: 4px;
  pointer-events: none;
}
.motion-seg {
  position: relative;
  flex-basis: 0;
  border-radius: 2px;
  background: #ffffff26;
  overflow: hidden;
  transition: transform 0.15s ease;
}
.motion-seg i {
  position: absolute;
  inset: 0;
  transform-origin: left;
  transform: scaleX(var(--fill, 0));
  background: var(--mp-teal);
}
.motion-scrub:hover .motion-seg {
  transform: scaleY(1.6);
}
.motion-range {
  position: absolute;
  inset: 0;
  width: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}
.motion-range:focus-visible + .motion-tip,
.motion-scrub:hover .motion-tip {
  opacity: 1;
}
.motion-tip {
  position: absolute;
  bottom: 22px;
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 5px 9px;
  border-radius: 6px;
  background: #0b161bee;
  border: 1px solid #2a3d44;
  color: var(--mp-text);
  font-size: 12px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}
.motion-scrub:focus-within::after {
  content: "";
  position: absolute;
  inset: 2px -4px;
  border: 1px solid #78e1d580;
  border-radius: 8px;
  pointer-events: none;
}
.motion-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
  color: var(--mp-text);
  font-size: 13px;
}
.motion-time {
  font-variant-numeric: tabular-nums;
  color: #c9d6d2;
  letter-spacing: 0.5px;
}
.motion-chapter {
  color: var(--mp-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.motion-spacer {
  flex: 1;
}
.motion-btn {
  position: relative;
  width: 36px;
  height: 36px;
  flex: none;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--mp-text);
  cursor: pointer;
}
.motion-btn:hover,
.motion-btn:focus-visible {
  background: #ffffff14;
}
.motion-btn::before,
.motion-btn::after {
  content: "";
  position: absolute;
}
.motion-play::before {
  left: 13px;
  top: 10px;
  width: 13px;
  height: 16px;
  background: currentColor;
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}
.motion-play[data-state="pause"]::before {
  left: 12px;
  width: 4px;
  clip-path: none;
  box-shadow: 8px 0 currentColor;
}
.motion-play[data-state="replay"]::before {
  left: 10px;
  top: 10px;
  width: 16px;
  height: 16px;
  background: none;
  clip-path: none;
  border: 2.5px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  box-sizing: border-box;
}
.motion-sound::before {
  left: 9px;
  top: 11px;
  width: 16px;
  height: 14px;
  background: currentColor;
  clip-path: polygon(0 30%, 35% 30%, 75% 0, 75% 100%, 35% 70%, 0 70%);
}
.motion-sound::after {
  right: 7px;
  top: 12px;
  width: 6px;
  height: 12px;
  border: 2px solid currentColor;
  border-left: 0;
  border-radius: 0 8px 8px 0;
}
.motion-sound[data-state="off"]::after {
  right: 6px;
  top: 17px;
  width: 11px;
  height: 0;
  border: 0;
  border-top: 2px solid #f09a5a;
  border-radius: 0;
  transform: rotate(-45deg);
}
.motion-volume {
  --vol: 1;
  flex: none;
  width: 72px;
  height: 36px;
  margin: 0 4px 0 -8px;
  background: transparent;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}
.motion-volume[hidden] {
  display: none;
}
.motion-volume::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(
    to right,
    var(--mp-text) calc(var(--vol) * 100%),
    #ffffff38 calc(var(--vol) * 100%)
  );
}
.motion-volume::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: #ffffff38;
}
.motion-volume::-moz-range-progress {
  height: 4px;
  border-radius: 2px;
  background: var(--mp-text);
}
.motion-volume::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -4px;
  border: 0;
  border-radius: 50%;
  background: var(--mp-text);
}
.motion-volume::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 0;
  border-radius: 50%;
  background: var(--mp-text);
}
.motion-volume:focus-visible {
  outline: 1px solid #78e1d580;
  outline-offset: 2px;
  border-radius: 4px;
}
.motion-full::before {
  inset: 10px;
  border: 2px solid currentColor;
  border-radius: 2px;
  clip-path: polygon(
    0 0,
    35% 0,
    35% 100%,
    65% 100%,
    65% 0,
    100% 0,
    100% 35%,
    0 35%,
    0 65%,
    100% 65%,
    100% 100%,
    0 100%
  );
}

/* End card. */
.motion-end {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: grid;
  place-items: center;
  background: #03070c99;
  backdrop-filter: blur(3px);
  animation: motion-fade 0.5s ease;
}
.motion-endbox {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.motion-end-kicker {
  flex-basis: 100%;
  margin: 0 0 6px;
  text-align: center;
  color: var(--mp-teal);
  letter-spacing: 3px;
  font-size: 13px;
}
.motion-endbtn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid #2d4148;
  background: #0b161bee;
  color: var(--mp-text);
  font: inherit;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
}
.motion-endbtn:hover {
  border-color: var(--mp-teal);
}
.motion-next {
  border-color: #78e1d599;
}
.motion-next small {
  color: var(--mp-muted);
  font-size: 12px;
}
.motion-next strong {
  font-weight: 600;
}
.motion-next span {
  color: var(--mp-teal);
}

/* Caption line under the stage. */
.motion-caption {
  min-height: 2.9em;
  margin: 14px auto 0;
  padding: 0 12px;
  text-align: center;
  color: var(--mp-text);
  font-size: clamp(17px, 1.55vw, 23px);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.3px;
}
.motion-caption.is-in {
  animation: motion-caption 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
}
@keyframes motion-caption {
  from {
    opacity: 0;
    transform: translateY(8px);
    filter: blur(4px);
  }
}
@keyframes motion-fade {
  from {
    opacity: 0;
  }
}

/* Fullscreen: captions overlay the picture. */
.motion-player.is-fullscreen {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  background: #000;
}
.motion-player.is-fullscreen .motion-stage {
  width: min(100vw, calc(100vh * 16 / 9));
  border: 0;
  border-radius: 0;
}
.motion-player.is-fullscreen .motion-caption,
.motion-player.is-theater .motion-caption {
  position: absolute;
  left: 50%;
  bottom: 9%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 86%;
  min-height: 0;
  margin: 0;
  padding: 8px 20px;
  border-radius: 12px;
  background: #03070ccc;
  font-size: clamp(16px, 2.2vw, 30px);
  z-index: 4;
  pointer-events: none;
}
.motion-player.is-fullscreen:is(.hud-awake, :not(.is-playing)) .motion-caption,
.motion-player.is-theater:is(.hud-awake, :not(.is-playing)) .motion-caption {
  bottom: max(9%, 130px);
}
.motion-player.is-fullscreen .motion-caption:empty,
.motion-player.is-theater .motion-caption:empty {
  display: none;
}

/* CSS theatre fallback (e.g. iPhone): fill the viewport, rotate in portrait. */
body.motion-theater {
  overflow: hidden;
}
.motion-player.is-theater {
  position: fixed;
  inset: 0;
  z-index: 1000;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: grid;
  place-items: center;
  background: #000;
}
.motion-player.is-theater .motion-stage {
  width: min(100vw, calc(100dvh * 16 / 9));
  border-radius: 0;
  border: 0;
}
@media (orientation: portrait) {
  .motion-player.is-theater {
    width: 100dvh;
    height: 100vw;
    inset: auto;
    left: 0;
    top: 0;
    transform-origin: top left;
    transform: rotate(90deg) translateY(-100%);
  }
  .motion-player.is-theater .motion-stage {
    width: min(100dvh, calc(100vw * 16 / 9));
  }
}

/* Lesson page layout tweaks around the player. */
body[data-lesson-style="motion"] main {
  padding-bottom: 28px;
}
body[data-lesson-style="motion"] .motion-note {
  max-width: 760px;
  margin: 18px auto 0;
  color: #7f949a;
  font-size: 12px;
  line-height: 1.8;
  text-align: center;
}

@media (max-width: 650px) {
  .motion-player {
    width: 100%;
  }
  .motion-stage {
    border-radius: 10px;
  }
  .motion-hud {
    padding: 34px 8px 4px;
  }
  .motion-btn {
    width: 44px;
    height: 44px;
  }
  .motion-btn::before {
    transform: translate(4px, 4px);
  }
  .motion-sound::after {
    transform: translate(4px, 4px);
  }
  .motion-sound[data-state="off"]::after {
    transform: translate(4px, 4px) rotate(-45deg);
  }
  .motion-chapter {
    display: none;
  }
  .motion-volume {
    width: 56px;
    height: 44px;
    margin-left: -6px;
  }
  .motion-bigplay {
    width: 56px;
    height: 56px;
    margin: -44px 0 0 -28px;
  }
  .motion-bigplay span {
    left: 22px;
    top: 17px;
    width: 17px;
    height: 22px;
  }
  .motion-soundhint {
    right: 6px;
    top: 6px;
    padding: 6px 10px;
    font-size: 11px;
  }
  .motion-caption {
    font-size: 17px;
    min-height: 3.2em;
  }
  .motion-endbtn {
    min-height: 44px;
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .motion-caption.is-in,
  .motion-end {
    animation: none;
  }
}