/* Text filters share continuous hit areas and a sliding selection background. */
.research-filter {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
  align-items: stretch;
  gap: 0;
  margin: 0 -7px 0 0;
}

.research-filter__btn {
  position: relative;
  z-index: 1;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: #777;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  padding: 5px 7px;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.18s ease, opacity 0.18s ease;
  -webkit-tap-highlight-color: transparent;
}

.research-filter__btn.is-active,
.research-filter__btn:hover,
.research-filter__btn:focus-visible {
  color: #222;
}

.research-filter__indicator {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  border-radius: 2px;
  background: #eee;
  pointer-events: none;
  z-index: 0;
  transition: transform 0.24s cubic-bezier(0.22, 1, 0.36, 1),
    width 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

.research-filter:has(:focus-visible) .research-filter__btn:not(:focus-visible):not(:hover) {
  opacity: 0.4;
}

.research-filter__btn:focus-visible {
  outline: 1px solid #999;
  outline-offset: -3px;
  border-radius: 3px;
}

@media (hover: hover) and (pointer: fine) {
  .research-filter:has(.research-filter__btn:hover) .research-filter__btn:not(:hover):not(:focus-visible) {
    opacity: 0.4;
  }
}

@media (max-width: 600px) {
  .research-heading {
    gap: 6px;
  }

  .research-filter {
    margin: 0 -5px 0 0;
  }

  .research-filter__btn {
    font-size: 10px;
    padding: 4px 5px;
  }
}

@media (max-width: 359px) {
  .research-heading {
    gap: 4px;
  }

  .research-heading h2 {
    font-size: 22px;
  }

  .research-filter {
    margin-right: -3px;
  }

  .research-filter__btn {
    font-size: 9px;
    padding-inline: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .research-filter__btn,
  .research-filter__indicator {
    transition: none;
  }
}