html,
body {
  box-sizing: border-box;
  height: 100%;
  margin: 0;
  background: #151515;
  color: #f7f4ed;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  overflow: hidden;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

.courseware-player {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-height: 100%;
  min-height: 0;
  overflow: hidden;
}

.courseware-player__stage {
  position: relative;
  display: grid;
  flex: 1 1 auto;
  height: 100%;
  min-height: 0;
  grid-template-areas: "stage";
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 24px;
}

.courseware-player__image-placeholder {
  z-index: 1;
  display: block;
  grid-area: stage;
  place-self: center;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 120ms ease;
}

.courseware-player--image-loading .courseware-player__image-placeholder {
  opacity: 1;
}

.courseware-player__image {
  position: relative;
  z-index: 2;
  display: block;
  grid-area: stage;
  place-self: center;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.38);
  opacity: 1;
  transition: opacity 120ms ease;
}

.courseware-player--image-loading .courseware-player__image {
  opacity: 0;
}

.courseware-player__nav-button {
  position: absolute;
  top: 50%;
  display: inline-flex;
  width: 48px;
  height: 72px;
  transform: translateY(-50%);
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(20, 20, 20, 0.42);
  color: #fff;
  font-size: 34px;
  line-height: 1;
  z-index: 18;
  cursor: pointer;
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.26);
  backdrop-filter: blur(14px) saturate(1.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, background 180ms ease;
}

.courseware-player--controls-visible .courseware-player__nav-button,
.courseware-player__nav-button:focus-visible {
  opacity: 1;
  pointer-events: auto;
}

.courseware-player__nav-button:hover {
  background: rgba(20, 20, 20, 0.62);
}

.courseware-player__nav-button:disabled {
  cursor: default;
}

.courseware-player--controls-visible .courseware-player__nav-button:disabled {
  opacity: 0.28;
}

.courseware-player__nav-button--previous {
  left: 24px;
}

.courseware-player__nav-button--next {
  right: 24px;
}

.courseware-player__toolbar {
  position: absolute;
  right: 8px;
  bottom: 8px;
  left: 8px;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: center;
  justify-items: stretch;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  background: rgba(12, 12, 12, 0.56);
  padding: 6px 16px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px) saturate(1.35);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.courseware-player--controls-visible .courseware-player__toolbar,
.courseware-player__toolbar:focus-within,
.courseware-player__toolbar:hover {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.courseware-player__counter {
  min-width: 88px;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: rgba(255, 255, 255, 0.78);
}

.courseware-player__audio {
  display: grid;
  grid-template-columns: 34px minmax(120px, 180px) 34px 64px;
  gap: 6px;
  align-items: center;
  justify-self: end;
  min-width: 0;
  width: min(100%, 340px);
}

.courseware-player__audio audio {
  display: none;
}

.courseware-player__audio-button {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.9);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}

.courseware-player__audio-button:hover {
  background: rgba(255, 255, 255, 0.14);
}

.courseware-player__audio-button:disabled {
  cursor: wait;
  opacity: 0.78;
}

.courseware-player__audio-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  font-size: 12px;
}

.courseware-player__audio--loading .courseware-player__audio-icon {
  animation: courseware-audio-loading 900ms ease-in-out infinite;
}

@keyframes courseware-audio-loading {
  0%,
  100% {
    opacity: 0.45;
  }

  50% {
    opacity: 1;
  }
}

.courseware-player__audio-timeline {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.courseware-player__audio-progress {
  width: 100%;
  accent-color: #f56b4b;
}

.courseware-player__audio-time {
  min-width: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  text-align: left;
}

.courseware-player__audio-speed {
  height: 32px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: #1f1f1f;
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  padding: 0 8px;
}

.courseware-player__thumbs {
  display: flex;
  min-width: 0;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.courseware-player__thumbs::-webkit-scrollbar {
  display: none;
}

.courseware-player__thumb {
  flex: 0 0 auto;
  height: 60px;
  padding: 0;
  border: 2px solid transparent;
  background: transparent;
  cursor: pointer;
}

.courseware-player__thumb[aria-current="true"] {
  border-color: #f56b4b;
}

.courseware-player__thumb img {
  display: block;
  width: auto;
  height: 100%;
  object-fit: contain;
  background: transparent;
}

.courseware-player__status {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: center;
  padding: 24px;
  color: rgba(255, 255, 255, 0.72);
  text-align: center;
}

@media (max-width: 760px) {
  .courseware-player__stage {
    padding: 12px;
  }

  .courseware-player__nav-button {
    width: 40px;
    height: 56px;
    font-size: 28px;
  }

  .courseware-player__nav-button--previous {
    left: 8px;
  }

  .courseware-player__nav-button--next {
    right: 8px;
  }

  .courseware-player__toolbar {
    right: 8px;
    bottom: 8px;
    left: 8px;
    grid-template-columns: 1fr;
  }

  .courseware-player__counter {
    text-align: center;
  }

  .courseware-player__audio {
    grid-template-columns: 34px minmax(0, 1fr) 34px 62px;
    justify-self: stretch;
    width: 100%;
  }
}