/* Alchemist explorers: the knowledge map, unified search, isotopes, ions, reactions, materials and the richer
   element and lesson pages. Mobile-first; every control and link row is at least 44px tall. */

/* ---------- Shared bits ---------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}
.chip-row .chip,
.chip-grid .chip {
  min-height: 44px;
}
.btn-link {
  min-height: 44px;
  padding: 0 0.25rem;
  border: 0;
  background: none;
  color: var(--link);
  font: inherit;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  cursor: pointer;
}
.big-value {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 0.2rem 0 0.6rem;
  overflow-wrap: anywhere;
}
.seg-btn .seg-sub {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  opacity: 0.8;
  line-height: 1.2;
}
.refs {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.ref-list {
  margin: 0 0 0.75rem;
  padding-left: 1.2rem;
  font-size: 0.85rem;
}
.ref-list li {
  margin: 0.35rem 0;
  overflow-wrap: anywhere;
}
.ref-list a {
  display: inline-block;
  min-height: 1.75rem;
}
.lesson-body .table-wrap {
  margin: 1.2em 0;
  overflow-x: auto;
}
.lesson-table th,
.lesson-table td {
  vertical-align: top;
}
.el-link,
.ion-link,
.rx-link,
.mat-link,
.mol-link {
  font-weight: 600;
}
blockquote footer a {
  overflow-wrap: anywhere;
}

/* ---------- Knowledge map (#/peta) and the home chain ---------- */
.home-chain {
  margin-top: 2rem;
}
.matter-chain {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr));
}
.chain-step {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 64px;
  height: 100%;
  padding: 0.75rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition:
    border-color 0.15s,
    transform 0.15s;
}
.chain-step:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}
.chain-step svg {
  flex: none;
  color: var(--brand);
}
.chain-step .step-number {
  flex: none;
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-weight: 800;
  font-size: 0.8rem;
}
.chain-step .step-content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.chain-step small {
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.35;
}
.domain-card {
  display: flex;
  flex-direction: column;
}
.domain-card .topic-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--brand-soft);
  color: var(--brand-strong);
  margin-bottom: 0.75rem;
}
.domain-card .topic-meta {
  margin-top: auto;
  padding-top: 0.75rem;
  color: var(--muted);
}
.coverage-grid {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 150px), 1fr));
  margin: 1rem 0 0;
}
.coverage-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  height: 100%;
}
.coverage-item strong {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--brand-strong);
  line-height: 1.1;
}
.coverage-item span {
  color: var(--muted);
  font-size: 0.85rem;
}
.concept-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr));
}
.concept-card {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  height: 100%;
}
.concept-card span {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ---------- Unified search (#/search) ---------- */
.search-form {
  align-items: end;
}
.search-form .btn {
  min-height: 46px;
}
.result-top {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin: 1rem 0;
  border-left: 5px solid var(--brand);
}
.result-top .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
}
.result-group {
  margin-top: 1.75rem;
}
.result-group > h2 {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.result-list {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.result-list li + li {
  border-top: 1px solid var(--border);
}
.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 52px;
  padding: 0.6rem 0.9rem;
  color: inherit;
  text-decoration: none;
}
.result-row:hover,
.result-row:focus-visible {
  background: var(--surface-2);
}
.result-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.result-title {
  font-weight: 700;
  overflow-wrap: anywhere;
}
.result-sub {
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}
.result-formula {
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
}
.result-row .badge {
  flex: none;
}
.search-start .grid {
  margin-top: 0.5rem;
}
.browse-card {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 64px;
}
.browse-card svg {
  color: var(--brand);
  flex: none;
}
.browse-card .card-title {
  margin: 0;
}

/* ---------- Nuclear notation and equations ---------- */
.nuc {
  white-space: nowrap;
}
.nuc-idx {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  vertical-align: -0.35em;
  margin-right: 0.08em;
  font-size: 0.62em;
  line-height: 1.05;
}
.nuc-idx sup,
.nuc-idx sub {
  font-size: 1em;
  line-height: 1.05;
  vertical-align: baseline;
  position: static;
}
.rx-eq {
  margin: 0;
  line-height: 2.1;
  font-weight: 600;
}
.rx-eq .sp,
.rx-eq .nuc {
  white-space: nowrap;
}
.rx-eq sub {
  font-size: 0.72em;
}
.rx-eq .op {
  color: var(--muted);
  padding: 0 0.1rem;
}
.rx-eq .coef {
  font-weight: 800;
  margin-right: 0.1rem;
}
.rx-eq sub.state {
  color: var(--muted);
  font-size: 0.72em;
  vertical-align: -0.25em;
  margin-left: 0.05em;
}
.rx-eq-sm {
  font-size: 0.95rem;
}
.rx-eq-lg {
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  text-align: center;
}
.equation-inline {
  white-space: normal;
}
.rx-equation {
  overflow-x: auto;
  padding: 1.25rem;
}
.rx-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
}
.rx-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.rx-card .card-title {
  margin: 0;
}
.rx-card .card-title a {
  display: inline-block;
  min-height: 1.75rem;
}
.rx-card .rx-eq {
  overflow-x: auto;
  padding: 0.4rem 0;
}
.rx-flow {
  list-style: none;
  margin: 1.25rem 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
  counter-reset: rx;
}
.rx-flow > li {
  position: relative;
  counter-increment: rx;
}
.rx-flow > li::before {
  content: counter(rx);
  position: absolute;
  top: -0.7rem;
  left: 1rem;
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--brand);
  color: var(--on-brand);
  font-size: 0.75rem;
  font-weight: 800;
}
.rx-flow > li:not(:last-child)::after {
  content: '↓';
  position: absolute;
  left: 50%;
  bottom: -1.45rem;
  transform: translateX(-50%);
  color: var(--muted);
  font-weight: 800;
}
.rx-list {
  columns: 2 16rem;
  column-gap: 1.5rem;
  padding-left: 1.2rem;
}
.rx-list li {
  break-inside: avoid;
  margin: 0.3rem 0;
}
.tally caption {
  text-align: left;
  font-weight: 700;
  padding-bottom: 0.4rem;
}
.tally tr.no td {
  color: var(--danger);
  font-weight: 700;
}
.ok {
  color: var(--ok);
}
@media (min-width: 980px) {
  .rx-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .rx-flow > li:not(:last-child)::after {
    content: '→';
    left: auto;
    right: -1.15rem;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
  }
}

/* ---------- Ions ---------- */
.ion-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  border-top: 4px solid var(--ion, var(--border));
}
.ion-cation {
  --ion: #2a78d6;
}
.ion-anion {
  --ion: #c2571a;
}
.ion-formula {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.2;
  white-space: nowrap;
}
.result-title .ion-formula {
  font-size: 1em;
  margin-right: 0.25rem;
}
.ion-card .topic-meta {
  margin-top: auto;
  color: var(--muted);
}

/* ---------- Isotopes ---------- */
.nuclide-chart {
  position: relative;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  -webkit-overflow-scrolling: touch;
}
.nuclide-chart svg {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
}
.nuclide-chart rect[data-z] {
  cursor: pointer;
}
.nuclide-chart .tick {
  fill: var(--muted);
  font-size: 10px;
}
.nuclide-chart .axis {
  stroke: var(--muted);
  stroke-width: 1;
}
.nuclide-chart .axis-label {
  fill: var(--text);
  font-size: 11px;
  font-weight: 700;
}
.nuclide-chart .row-highlight {
  fill: #ffda66;
  fill-opacity: 0.55;
  stroke: #b47708;
  stroke-width: 0.8;
}
.chart-tip {
  position: absolute;
  z-index: 3;
  max-width: 180px;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  background: var(--text);
  color: #fff;
  font-size: 0.75rem;
  line-height: 1.45;
  pointer-events: none;
  box-shadow: var(--shadow-lg);
}
.dot-outline {
  background: transparent;
  border: 1.5px solid #8b93a3;
}
.iso-table td,
.iso-table th {
  white-space: nowrap;
}
.iso-table th a {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
}

/* ---------- Materials ---------- */
.pdb-figure {
  margin: 0;
  text-align: center;
}
.pdb-figure img {
  max-width: min(100%, 360px);
  border-radius: var(--radius-sm);
  background: #fff;
}
.pdb-figure figcaption {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.8rem;
}

/* ---------- Half-life lab ---------- */
.chart .series-theory {
  stroke: var(--muted);
  stroke-width: 2;
  stroke-dasharray: 6 5;
}

@media print {
  .nuclide-chart,
  .chart-tip,
  .search-form {
    display: none;
  }
}