.research-tabs {
  margin: 1rem 0 1.5rem;
}

.research-tabs > input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.research-tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--main-border-color);
}

.research-tab-list label {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  margin-bottom: -1px;
  padding: 0.45rem 0.75rem;
  border: 1px solid transparent;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-weight: 600;
  line-height: 1.2;
}

.research-tab-list label:hover {
  color: var(--link-hover-color);
}

#for-experts:focus-visible ~ .research-tab-list label[for="for-experts"],
#for-non-mathematicians:focus-visible ~ .research-tab-list label[for="for-non-mathematicians"],
#topic-quartics:focus-visible ~ .research-tab-list label[for="topic-quartics"],
#topic-visualizations:focus-visible ~ .research-tab-list label[for="topic-visualizations"] {
  outline: 2px solid var(--link-color);
  outline-offset: 2px;
}

.research-tab-panel {
  display: none;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--main-border-color);
  background: var(--card-bg);
  border-radius: 6px;
}

#for-experts:checked ~ .research-tab-list label[for="for-experts"],
#for-non-mathematicians:checked ~ .research-tab-list label[for="for-non-mathematicians"],
#topic-quartics:checked ~ .research-tab-list label[for="topic-quartics"],
#topic-visualizations:checked ~ .research-tab-list label[for="topic-visualizations"] {
  color: var(--link-color);
  border-color: var(--main-border-color);
  border-bottom-color: var(--main-bg);
  background: var(--main-bg);
}

#for-experts:checked ~ .research-tab-panels .for-experts,
#for-non-mathematicians:checked ~ .research-tab-panels .for-non-mathematicians,
#topic-quartics:checked ~ .research-tab-panels .topic-quartics,
#topic-visualizations:checked ~ .research-tab-panels .topic-visualizations {
  display: block;
}

.research-image-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0;
  max-width: 22rem;
}

.research-image-pair > div {
  aspect-ratio: 1 / 1;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  border-radius: 6px;
}

.research-image-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 1rem 0;
  max-width: 34rem;
}

.research-image-strip figure {
  margin: 0;
  text-align: center;
}

.research-image-thumb {
  width: 100%;
  aspect-ratio: 1 / 1;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  border-radius: 6px;
}

.research-image-strip figcaption {
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.25;
  color: var(--text-muted-color);
}

.research-centered-figure {
  margin: 0.45rem auto 0.65rem;
  text-align: center;
}

.research-centered-image {
  width: min(100%, 28rem);
  aspect-ratio: 16 / 10;
  margin: 0 auto;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  border-radius: 6px;
}

.research-centered-figure figcaption {
  margin-top: 0.25rem;
  font-size: 0.78rem;
  line-height: 1.25;
  color: var(--text-muted-color);
}

@media (max-width: 576px) {
  .research-image-pair {
    grid-template-columns: 1fr;
  }

  .research-image-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}