.similarity-task {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 3px 16px rgba(0, 0, 0, 0.12);
  box-sizing: border-box;
  margin: 24px auto;
  max-width: 1220px;
  padding: 40px 48px;
  text-align: center;
}

.similarity-task h2 {
  margin: 0 0 28px;
}

.similarity-images {
  display: flex;
  gap: 70px;
  justify-content: center;
  margin: 36px 0;
}

.similarity-images img {
  height: 220px;
  object-fit: contain;
  width: 220px;
}

.similarity-slider-labels {
  display: flex;
  justify-content: space-between;
  margin: 0 auto 10px;
  max-width: 900px;
}

#similarity-slider {
  --slider-position: 50%;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
  display: block;
  height: 30px;
  margin: 0 auto 24px;
  max-width: 900px;
  width: 90%;
}

/* The range keeps an internal midpoint solely because HTML requires a value.
   Before interaction, the track is entirely neutral and the thumb is absent. */
#similarity-slider::-webkit-slider-runnable-track {
  background: linear-gradient(
    to right,
    #2c7be5 0 var(--slider-position),
    #c9ced6 var(--slider-position) 100%
  );
  border-radius: 5px;
  height: 8px;
}

#similarity-slider::-moz-range-track {
  background: #c9ced6;
  border-radius: 5px;
  height: 8px;
}

#similarity-slider::-moz-range-progress {
  background: #2c7be5;
  border-radius: 5px;
  height: 8px;
}

#similarity-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  background: #2c7be5;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #1e5fae;
  height: 22px;
  margin-top: -7px;
  width: 22px;
}

#similarity-slider::-moz-range-thumb {
  background: #2c7be5;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #1e5fae;
  height: 18px;
  width: 18px;
}

#similarity-slider.untouched::-webkit-slider-runnable-track {
  background: #c9ced6;
}

#similarity-slider.untouched::-webkit-slider-thumb {
  opacity: 0;
}

#similarity-slider.untouched::-moz-range-progress {
  background: transparent;
}

#similarity-slider.untouched::-moz-range-thumb {
  opacity: 0;
}

#similarity-slider:focus-visible {
  outline: 3px solid rgba(44, 123, 229, 0.45);
  outline-offset: 2px;
}

#similarity-status {
  margin-top: 38px;
}

.triad-choice {
  background: transparent;
  border: 3px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  padding: 5px;
}

.triad-choice.selected { border-color: #2c7be5; }

.similarity-images.triad {
  gap: 28px;
}

@media (max-width: 640px) {
  .similarity-task {
    margin: 12px auto;
    padding: 28px 22px;
  }

  .similarity-images {
    gap: 20px;
  }

  .similarity-images img {
    height: 130px;
    width: 130px;
  }
}

.similarity-images.triad img {
  height: 190px;
  width: 190px;
}