.instruction-video-player {
  position: relative;
  isolation: isolate;
  box-sizing: border-box;
  width: 100%;
  aspect-ratio: var(--instruction-video-ratio, 16 / 9);
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--border-subtle, #303448);
  border-radius: var(--radius-lg, 18px);
  background: #080b13;
  box-shadow: 0 3px 16px rgb(0 0 0 / 12%);
}
.instruction-video-player .instruction-video {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
  max-height: none;
  margin: 0;
  border: 0;
  border-radius: inherit;
  object-fit: contain;
  background: #080b13;
}
.instruction-video-play, .instruction-video-loading-indicator {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  width: clamp(44px, 14%, 64px);
  aspect-ratio: 1;
  padding: 0;
  transform: translate(-50%, -50%);
  color: #fff;
  border: 1px solid rgb(255 255 255 / 70%);
  border-radius: 50%;
  background: rgb(7 9 15 / 58%);
  box-shadow: 0 3px 18px rgb(0 0 0 / 32%);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  cursor: pointer;
}
.instruction-video-loading-indicator {
  box-sizing: border-box;
  z-index: 2;
  border: 2px solid rgb(255 255 255 / 24%);
  border-top-color: #fff;
  background: rgb(7 9 15 / 38%);
  cursor: default;
  pointer-events: none;
  animation: instruction-video-loading-spin .85s linear infinite;
}
@keyframes instruction-video-loading-spin { to { transform: translate(-50%, -50%) rotate(360deg); } }
.instruction-video-play svg { display: block; width: 44%; height: 44%; fill: currentColor; }
.instruction-video-play:hover { background: rgb(7 9 15 / 78%); }
.instruction-video-play:focus-visible, .instruction-video-retry:focus-visible { outline: 2px solid var(--accent, #a18afb); outline-offset: 3px; }
.instruction-video-play[hidden], .instruction-video-loading-indicator[hidden], .instruction-video-error[hidden] { display: none !important; }
.instruction-video-error { position: absolute; z-index: 2; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; padding: 18px; color: var(--text-primary, #f3f4fa); background: rgb(9 12 20 / 92%); text-align: center; font-size: 13px; }
.instruction-video-error p { margin: 0; max-width: 420px; }
.instruction-video-retry { padding: 7px 12px; color: inherit; border: 1px solid var(--border-accent, #6857aa); border-radius: 10px; background: var(--surface-2, #25233d); cursor: pointer; }
.exercise-instruction-card { overflow: hidden; border: 1px solid var(--border-subtle, #303448); border-radius: var(--radius-lg, 18px); background: var(--surface-1, #111521); }
.exercise-instruction-card .instruction-video-player { border: 0; border-radius: 0; box-shadow: none; }
.exercise-instruction-text { padding: 16px 18px 18px; color: var(--text-secondary, #b8bfd0); white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.65; }
@media (max-width: 380px) { .exercise-instruction-text { padding: 13px 14px 15px; } .instruction-video-error { padding: 12px; gap: 7px; font-size: 12px; } }
@media (prefers-reduced-motion: reduce) { .instruction-video-loading-indicator { animation: none; } }