/* Planetology. Uses the site palette. Bar widths are a fraction of 100 Earth masses. */

.planetology {
  --pair: var(--indigo);
  --pair-wash: var(--indigo-wash);
}

.planetology[data-pair="mercury-mars"] {
  --pair: var(--clay);
  --pair-wash: var(--clay-wash);
}

.planetology[data-pair="earth-venus"] {
  --pair: var(--verdigris);
  --pair-wash: var(--verdigris-wash);
}

.planetology[data-pair="jupiter-uranus"] {
  --pair: var(--ochre);
  --pair-wash: var(--ochre-wash);
}

.planetology[data-pair="saturn-neptune"] {
  --pair: var(--indigo);
  --pair-wash: var(--indigo-wash);
}

.planetology[data-pair="dwarfs"] {
  --pair: var(--clay);
  --pair-wash: var(--ochre-wash);
}

.planetology > .kicker {
  margin: 0 0 0.35rem;
}

.pair-head h1,
.planetology > h1 {
  margin: 0.15rem 0 0.45rem;
  max-width: 18ch;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.contrast-line {
  margin: 0;
  max-width: 40rem;
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.credit,
.method {
  margin: 0.7rem 0 0;
  max-width: 42rem;
  color: var(--ink-soft);
}

.pair-nav,
.q-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.15rem 0 0;
}

.pair-nav a,
.q-jump a,
.stages__labels label,
.pick label {
  display: inline-flex;
  align-items: center;
  min-height: 2.4rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-raised);
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.pair-nav a[aria-current="page"],
.q-jump a:hover,
.pair-nav a:hover,
.stages__labels label:hover,
.pick label:hover {
  color: var(--ink);
  border-color: var(--pair);
}

.pair-nav a[aria-current="page"] {
  background: var(--pair-wash);
  font-weight: 600;
}

.glance {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin: 1.35rem 0 0.4rem;
}

.glance__card {
  padding: 0.9rem 1rem 1rem;
  background: var(--pair-wash);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.glance__name {
  margin: 0 0 0.45rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.glance dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem 0.8rem;
  margin: 0;
}

.glance dt {
  color: var(--ink-faint);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.glance dd {
  margin: 0.1rem 0 0;
  font-size: 1rem;
}

.q {
  margin-top: 2.4rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  scroll-margin-top: 5.5rem;
}

.q__kicker {
  margin: 0;
  color: var(--pair);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.q h2 {
  margin: 0.2rem 0 0.7rem;
  max-width: 22ch;
  font-family: var(--serif);
  font-weight: 560;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
}

.answer {
  margin: 0 0 1rem;
  max-width: 44rem;
  font-size: 1.08rem;
  line-height: 1.65;
}

.versus {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  margin: 0.3rem 0 1rem;
}

.col {
  padding: 0.9rem 1rem 1rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-top: 3px solid var(--pair);
  border-radius: 14px;
}

.col h3 {
  margin: 0 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 560;
}

.col p,
.panel p,
.epoch p {
  margin: 0.4rem 0 0;
}

.col p:first-of-type {
  margin-top: 0;
}

.planetology[data-highlight="pluto"] .col[data-body="pluto"],
.planetology[data-highlight="ceres"] .col[data-body="ceres"],
.planetology[data-highlight="eris"] .col[data-body="eris"] {
  background: var(--pair-wash);
  border-color: var(--pair);
}

.evidence,
.open {
  max-width: 44rem;
  margin: 0.8rem 0 0;
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  line-height: 1.55;
}

.evidence {
  background: var(--bg-raised);
  border: 1px solid var(--line);
}

.open {
  background: var(--ochre-wash);
  border: 1px solid var(--line);
}

.evidence strong,
.open strong {
  font-weight: 600;
}

.control {
  margin-top: 1rem;
}

.control__label,
.pick__label,
.legend {
  margin: 0 0 0.45rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.stages input[type="radio"],
.pick input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.stages__labels,
.pick__labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pick input:focus-visible + label,
.stages:has(> input[value="0"]:focus-visible) label[for$="-0"],
.stages:has(> input[value="1"]:focus-visible) label[for$="-1"],
.stages:has(> input[value="2"]:focus-visible) label[for$="-2"],
.stages:has(> input[value="3"]:focus-visible) label[for$="-3"],
.stages:has(> input[value="4"]:focus-visible) label[for$="-4"],
.stages:has(> input[value="5"]:focus-visible) label[for$="-5"],
.stages:has(> input[value="6"]:focus-visible) label[for$="-6"],
.stages:has(> input[value="7"]:focus-visible) label[for$="-7"] {
  outline: 2px solid var(--indigo);
  outline-offset: 3px;
}

.pick input:checked + label,
.stages:has(> input[value="0"]:checked) label[for$="-0"],
.stages:has(> input[value="1"]:checked) label[for$="-1"],
.stages:has(> input[value="2"]:checked) label[for$="-2"],
.stages:has(> input[value="3"]:checked) label[for$="-3"],
.stages:has(> input[value="4"]:checked) label[for$="-4"],
.stages:has(> input[value="5"]:checked) label[for$="-5"],
.stages:has(> input[value="6"]:checked) label[for$="-6"],
.stages:has(> input[value="7"]:checked) label[for$="-7"] {
  background: var(--pair-wash);
  border-color: var(--pair);
  color: var(--ink);
  font-weight: 600;
}

.stages__range {
  width: min(100%, 36rem);
  margin: 0.7rem 0 0.15rem;
  accent-color: var(--pair);
}

.stages .panel {
  display: none;
  margin-top: 0;
  padding: 0.95rem 1rem 1rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.stages__panels {
  margin-top: 0.85rem;
}

.stages > input:nth-of-type(1):checked ~ .stages__panels > .panel:nth-child(1),
.stages > input:nth-of-type(2):checked ~ .stages__panels > .panel:nth-child(2),
.stages > input:nth-of-type(3):checked ~ .stages__panels > .panel:nth-child(3),
.stages > input:nth-of-type(4):checked ~ .stages__panels > .panel:nth-child(4),
.stages > input:nth-of-type(5):checked ~ .stages__panels > .panel:nth-child(5),
.stages > input:nth-of-type(6):checked ~ .stages__panels > .panel:nth-child(6),
.stages > input:nth-of-type(7):checked ~ .stages__panels > .panel:nth-child(7),
.stages > input:nth-of-type(8):checked ~ .stages__panels > .panel:nth-child(8) {
  display: block;
}

.stages--stack .panel {
  display: block;
  margin-top: 0.45rem;
  border-left: 3px solid var(--line);
  border-radius: 0 14px 14px 0;
}

.stages--stack > input:nth-of-type(1):checked ~ .stages__panels > .panel:nth-child(1),
.stages--stack > input:nth-of-type(2):checked ~ .stages__panels > .panel:nth-child(2),
.stages--stack > input:nth-of-type(3):checked ~ .stages__panels > .panel:nth-child(3),
.stages--stack > input:nth-of-type(4):checked ~ .stages__panels > .panel:nth-child(4),
.stages--stack > input:nth-of-type(5):checked ~ .stages__panels > .panel:nth-child(5),
.stages--stack > input:nth-of-type(6):checked ~ .stages__panels > .panel:nth-child(6),
.stages--stack > input:nth-of-type(7):checked ~ .stages__panels > .panel:nth-child(7),
.stages--stack > input:nth-of-type(8):checked ~ .stages__panels > .panel:nth-child(8) {
  display: block;
  border-left-color: var(--pair);
  background: var(--pair-wash);
}

.panel h3,
.epoch h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
}

.tag {
  display: inline-block;
  margin: 0 0.35rem 0.35rem 0;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: var(--pair-wash);
  color: var(--ink);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.mass {
  margin-top: 0.85rem;
}

.mass + .mass {
  margin-top: 0.7rem;
}

.mass__top {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.28rem;
  font-size: 0.95rem;
}

.mass__top span {
  color: var(--ink-soft);
  text-align: right;
}

.track {
  display: flex;
  height: 0.85rem;
  overflow: hidden;
  background: var(--line);
  border-radius: 999px;
}

.track i {
  display: block;
  height: 100%;
  min-width: 2px;
}

.track .rock { background: var(--indigo); }
.track .gas { background: var(--ochre); }

.bar-key {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 0.55rem 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.bar-key i {
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  margin-right: 0.3rem;
  border-radius: 2px;
  vertical-align: -1px;
}

.cores {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.core {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.8rem;
  align-items: center;
}

.orb {
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 50%;
  background: var(--clay-wash);
  border: 1px solid var(--clay);
  display: grid;
  place-items: center;
}

.orb b {
  display: block;
  border-radius: 50%;
  background: var(--clay);
}

.orb--mercury b {
  width: 85%;
  height: 85%;
}

.orb--rock {
  background:
    radial-gradient(circle at 35% 35%, var(--ochre-wash), var(--clay-wash) 55%, var(--clay));
  border-color: var(--clay);
}

.layers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
}

.layer-stack {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.layer-stack label {
  display: block;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  cursor: pointer;
}

.layer-set {
  position: relative;
}

.layer-set input {
  position: absolute;
  opacity: 0;
}

.layer-set input:checked + label {
  background: var(--pair-wash);
  border-color: var(--pair);
  font-weight: 600;
}

.layer-set input:focus-visible + label {
  outline: 2px solid var(--indigo);
  outline-offset: 2px;
}

.layer-set .layer-note {
  display: none;
  margin: 0.55rem 0 0;
  color: var(--ink-soft);
}

.layer-set > input:nth-of-type(1):checked ~ .layer-note:nth-of-type(1),
.layer-set > input:nth-of-type(2):checked ~ .layer-note:nth-of-type(2),
.layer-set > input:nth-of-type(3):checked ~ .layer-note:nth-of-type(3),
.layer-set > input:nth-of-type(4):checked ~ .layer-note:nth-of-type(4) {
  display: block;
}

.layer-set:has(> input:nth-of-type(1):checked) .layer-stack label:nth-child(1),
.layer-set:has(> input:nth-of-type(2):checked) .layer-stack label:nth-child(2),
.layer-set:has(> input:nth-of-type(3):checked) .layer-stack label:nth-child(3),
.layer-set:has(> input:nth-of-type(4):checked) .layer-stack label:nth-child(4) {
  background: var(--pair-wash);
  border-color: var(--pair);
  font-weight: 600;
}

.chrono {
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.chrono li {
  margin: 0;
  padding: 0.55rem 0 0.55rem 2.1rem;
  border-left: 2px solid var(--line);
  counter-increment: step;
}

.chrono li::before {
  content: counter(step);
  float: left;
  margin-left: -1.7rem;
  color: var(--pair);
  font-family: var(--serif);
  font-weight: 560;
}

.chrono a {
  font-weight: 600;
}

.spine {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.spine a {
  display: block;
  padding: 1rem 1.05rem 1.05rem;
  color: inherit;
  text-decoration: none;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-left: 4px solid var(--spine, var(--indigo));
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.spine a:hover {
  border-color: var(--spine, var(--indigo));
}

.spine .idx {
  margin: 0;
  color: var(--spine, var(--indigo));
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.spine h2 {
  margin: 0.2rem 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.spine p {
  margin: 0;
  color: var(--ink-soft);
}

.questions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.questions li {
  padding: 0.75rem 0.9rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.questions strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 560;
}

.sources {
  margin-top: 2.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.sources h2 {
  margin: 0 0 0.4rem;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.25rem;
}

.sources p {
  margin: 0.35rem 0 0;
  max-width: 46rem;
}

.pair-nav--end {
  margin-top: 1.4rem;
}

@media (min-width: 720px) {
  .glance,
  .versus,
  .cores,
  .layers,
  .questions {
    grid-template-columns: 1fr 1fr;
  }

  .versus--3,
  .spine {
    grid-template-columns: 1fr 1fr;
  }

  .spine li:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

@media (min-width: 980px) {
  .versus--3,
  .glance--3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .core {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .glance dl {
    grid-template-columns: 1fr;
  }
}

@media print {
  .stages .panel,
  .layer-set .layer-note { display: block; }
  .pair-nav, .q-jump, .stages__labels, .stages__range, .pick { display: none; }
}

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