.kidney-hero,
.kidney-atlas-hero {
  background:
    radial-gradient(circle at 88% 16%, rgba(69, 110, 125, 0.14), transparent 24rem),
    var(--color-surface-soft);
}

.kidney-path span {
  border-color: rgba(46, 99, 116, 0.24);
}

.kidney-visual {
  position: relative;
  min-height: 280px;
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
  background: #edf1ee;
}

.kidney-outline {
  position: absolute;
  inset: 22px 10% 24px;
  overflow: hidden;
  border: 3px solid #315c68;
  border-radius: 47% 44% 47% 45% / 52% 40% 55% 45%;
  background: #d4b0a1;
  transform: rotate(-3deg);
}

.kidney-cortex-shape,
.kidney-medulla-shape,
.kidney-papilla-shape,
.kidney-pelvis-shape {
  position: absolute;
}

.kidney-cortex-shape {
  inset: 13px;
  border-radius: inherit;
  background:
    radial-gradient(circle at 24% 28%, #805a61 0 4px, transparent 5px),
    radial-gradient(circle at 74% 22%, #805a61 0 4px, transparent 5px),
    radial-gradient(circle at 28% 72%, #805a61 0 4px, transparent 5px),
    radial-gradient(circle at 72% 68%, #805a61 0 4px, transparent 5px),
    #c78d89;
}

.kidney-medulla-shape {
  inset: 24% 24% 20% 23%;
  border-radius: 44% 55% 48% 52%;
  background:
    repeating-linear-gradient(82deg, rgba(90, 70, 77, 0.22) 0 3px, transparent 3px 11px),
    #d9b3a0;
}

.kidney-papilla-shape {
  top: 38%;
  right: 12%;
  width: 35%;
  height: 24%;
  border-radius: 46% 65% 55% 46%;
  background: #e8c6af;
}

.kidney-pelvis-shape {
  top: 28%;
  right: -5%;
  width: 31%;
  height: 44%;
  border: 8px solid #f1d9c4;
  border-right: 0;
  border-radius: 52% 0 0 52%;
}

.kidney-focus {
  position: absolute;
  z-index: 4;
  top: 54px;
  left: 16%;
  width: 80px;
  height: 66px;
  border: 3px solid #e4a14e;
  border-radius: 50%;
  box-shadow: 0 0 0 7px rgba(228, 161, 78, 0.2);
}

.kidney-visual[data-landmark="capsule_cortex"] .kidney-focus {
  top: 30px;
  left: 11%;
  width: 70%;
  height: 210px;
  border-radius: 46%;
}

.kidney-visual[data-landmark="glomerulus_bowman"] .kidney-focus {
  top: 58px;
  left: 23%;
  width: 58px;
  height: 58px;
}

.kidney-visual[data-landmark="cortical_tubules_medullary_rays"] .kidney-focus {
  top: 114px;
  left: 25%;
  width: 92px;
  height: 72px;
}

.kidney-visual[data-landmark="corticomedullary_junction"] .kidney-focus {
  top: 72px;
  left: 39%;
  width: 95px;
  height: 118px;
}

.kidney-visual[data-landmark="outer_medulla_outer_stripe"] .kidney-focus {
  top: 70px;
  left: 46%;
  width: 72px;
  height: 68px;
}

.kidney-visual[data-landmark="outer_medulla_inner_stripe"] .kidney-focus {
  top: 124px;
  left: 49%;
  width: 75px;
  height: 60px;
}

.kidney-visual[data-landmark="inner_medulla_papilla"] .kidney-focus {
  top: 104px;
  left: 61%;
  width: 95px;
  height: 66px;
}

.kidney-visual[data-landmark="pelvis_urothelium"] .kidney-focus {
  top: 82px;
  right: 8%;
  left: auto;
  width: 86px;
  height: 110px;
  border-radius: 42%;
}

.kidney-visual .placeholder-label {
  position: absolute;
  right: 1rem;
  bottom: 0.85rem;
  z-index: 5;
}

.kidney-segment-grid,
.kidney-evidence-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.kidney-segment,
.kidney-evidence {
  display: grid;
  gap: 0.55rem;
  align-content: start;
  min-height: 158px;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  text-align: left;
}

button.kidney-segment,
button.kidney-evidence {
  cursor: pointer;
}

.kidney-segment:hover,
.kidney-segment:focus-visible,
.kidney-evidence:hover,
.kidney-evidence:focus-visible {
  border-color: var(--color-primary);
}

.kidney-segment.is-visited,
.kidney-evidence.is-visited {
  border-color: rgba(23, 77, 93, 0.45);
  background: var(--color-primary-soft);
}

.kidney-segment__number,
.kidney-evidence__number {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 750;
}

.kidney-builder-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.kidney-builder-result {
  min-height: 230px;
}

.kidney-atlas-hero {
  padding: clamp(2.5rem, 5vw, 5rem) 0;
}

.atlas-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 2rem;
  align-items: start;
}

.atlas-boundary {
  padding: 1.3rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.atlas-boundary h2 {
  font-size: 1.18rem;
}

.atlas-main {
  padding-block: 2.5rem 4rem;
}

.kidney-filter {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.atlas-results-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin: 1.5rem 0 1rem;
}

.atlas-results-header p {
  margin: 0;
}

.review-note {
  color: var(--color-ink-soft);
  font-size: 0.94rem;
}

.kidney-term-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.kidney-term-card {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.kidney-term-card summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  padding: 1.15rem;
  cursor: pointer;
}

.kidney-term-card summary::marker {
  color: var(--color-primary);
}

.kidney-term-card__title {
  display: block;
  color: var(--color-ink);
  font-weight: 780;
  font-size: 1.08rem;
}

.kidney-term-card__english {
  display: block;
  margin-top: 0.15rem;
  color: var(--color-ink-soft);
  font-size: 0.92rem;
}

.kidney-term-card__body {
  display: grid;
  gap: 1rem;
  padding: 0 1.15rem 1.3rem;
  border-top: 1px solid var(--color-line);
}

.kidney-term-card__body h3 {
  margin-bottom: 0.3rem;
  font-size: 1rem;
}

.kidney-term-card__body section {
  padding-top: 1rem;
}

.species-note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.species-note-grid article {
  padding: 0.8rem;
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
}

@media (max-width: 960px) {
  .kidney-segment-grid,
  .kidney-evidence-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .atlas-hero__grid,
  .kidney-filter {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .atlas-hero__grid,
  .kidney-term-grid,
  .species-note-grid,
  .kidney-builder-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .kidney-filter,
  .kidney-segment-grid,
  .kidney-evidence-grid {
    grid-template-columns: 1fr;
  }

  .kidney-visual {
    min-height: 235px;
  }

  .kidney-outline {
    inset-inline: 4%;
  }

  .kidney-term-card summary {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kidney-focus {
    transition: none;
  }
}