.reference-shell {
  --supervised: #0b6fc2;
  --unsupervised: #087f5b;
  --specialist: #9a4d00;
}

.reference-jump {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: -10px 0 26px;
  padding: 0 0 14px;
}

.reference-jump a {
  font-size: 0.86rem;
  font-weight: 800;
  text-decoration: none;
}

.reference-section {
  border-bottom: 1px solid var(--line);
  padding: 16px 0 34px;
}

.section-heading {
  align-items: flex-start;
  display: grid;
  gap: 16px;
  grid-template-columns: 42px minmax(0, 1fr);
  margin: 20px 0 18px;
}

.section-heading h2 {
  font-size: 1.55rem;
  margin: 0 0 4px;
}

.section-heading p:last-child {
  color: var(--muted);
  margin: 0;
}

.section-number {
  border-top: 3px solid var(--orange);
  color: var(--blue-dark);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.82rem;
  font-weight: 900;
  margin: 5px 0 0;
  padding-top: 5px;
}

.router-steps {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 18px 0 22px;
}

.route-step {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 4px solid var(--blue);
  border-radius: 6px;
  min-height: 190px;
  padding: 15px;
}

.route-step > span {
  align-items: center;
  background: var(--blue-soft);
  border-radius: 50%;
  color: var(--blue-dark);
  display: inline-flex;
  font-size: 0.78rem;
  font-weight: 900;
  height: 27px;
  justify-content: center;
  width: 27px;
}

.route-step h3 {
  font-size: 0.98rem;
  margin: 12px 0 6px;
}

.route-step p {
  color: var(--muted);
  font-size: 0.84rem;
  margin: 0;
}

.scenario-table td:first-child {
  font-weight: 800;
  min-width: 145px;
}

.scenario-table td:nth-child(2) {
  min-width: 190px;
}

.scenario-table td:nth-child(3) {
  color: var(--blue-dark);
  font-weight: 750;
  min-width: 220px;
}

.imbalance-steps {
  counter-reset: imbalance;
  display: grid;
  gap: 9px;
  list-style: none;
  padding: 0;
}

.imbalance-steps li {
  background: var(--paper);
  border-left: 4px solid var(--orange);
  counter-increment: imbalance;
  min-height: 50px;
  padding: 12px 14px 12px 48px;
  position: relative;
}

.imbalance-steps li::before {
  color: #a24f05;
  content: counter(imbalance, decimal-leading-zero);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 900;
  left: 14px;
  position: absolute;
  top: 14px;
}

.metric-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 20px 0;
}

.metric-grid article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  min-height: 170px;
  padding: 16px;
}

.metric-label {
  color: var(--green);
  font-size: 0.74rem;
  font-weight: 900;
  margin: 0 0 6px;
  text-transform: uppercase;
}

.metric-grid h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.metric-grid article > p:last-child {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0;
}

.compact-table th,
.compact-table td {
  font-size: 0.86rem;
}

.compact-table td:first-child {
  font-weight: 800;
  min-width: 130px;
}

.group-title {
  border-left: 4px solid var(--blue);
  margin: 32px 0 12px;
  padding-left: 11px;
}

.algorithm-list {
  display: grid;
  gap: 9px;
}

.algorithm-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  scroll-margin-top: 16px;
}

.algorithm-card[open] {
  border-color: #9eb5c8;
  box-shadow: 0 6px 20px rgba(25, 39, 52, 0.06);
}

.algorithm-card summary {
  align-items: center;
  cursor: pointer;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(220px, 0.8fr) minmax(260px, 1.2fr) 24px;
  list-style: none;
  min-height: 70px;
  padding: 13px 16px;
}

.algorithm-card summary::-webkit-details-marker {
  display: none;
}

.algorithm-card summary::after {
  color: var(--blue-dark);
  content: "+";
  font-size: 1.45rem;
  font-weight: 500;
  line-height: 1;
  text-align: center;
}

.algorithm-card[open] summary::after {
  content: "−";
}

.algorithm-card summary:hover {
  background: #f8fafb;
}

.algorithm-card summary:focus-visible {
  outline: 3px solid rgba(11, 111, 194, 0.28);
  outline-offset: 2px;
}

.algorithm-card summary span {
  min-width: 0;
}

.algorithm-card summary strong,
.algorithm-card summary small {
  display: block;
}

.algorithm-card summary strong {
  color: var(--ink);
  font-size: 0.98rem;
}

.algorithm-card summary small {
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 700;
  margin-top: 2px;
}

.algorithm-card summary em {
  color: var(--blue-dark);
  font-size: 0.86rem;
  font-style: normal;
  font-weight: 750;
}

.algorithm-detail {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 18px 20px 20px;
}

.algorithm-detail h4 {
  color: var(--muted);
  font-size: 0.72rem;
  margin: 0 0 7px;
  text-transform: uppercase;
}

.algorithm-detail p {
  font-size: 0.86rem;
  margin: 0;
}

.algorithm-detail > div + div {
  border-left: 1px solid var(--line);
  padding-left: 20px;
}

.mistake-list {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 18px 0 26px;
}

.mistake-list article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 5px solid var(--orange);
  border-radius: 6px;
  min-height: 190px;
  padding: 18px;
}

.mistake-id {
  color: #91500c;
  font-size: 0.75rem;
  font-weight: 900;
  margin: 0 0 7px;
}

.mistake-list h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.mistake-list article > p:last-child {
  color: var(--muted);
  font-size: 0.86rem;
  margin: 0;
}

.source-columns {
  columns: 2;
  column-gap: 36px;
}

.source-columns li {
  break-inside: avoid;
}

.source-note {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
  margin-top: 20px;
  padding-top: 14px;
}

@media (max-width: 980px) {
  .router-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (max-width: 760px) {
  .algorithm-card summary {
    gap: 5px 12px;
    grid-template-columns: minmax(0, 1fr) 24px;
  }

  .algorithm-card summary em {
    grid-column: 1;
  }

  .algorithm-card summary::after {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .algorithm-detail {
    grid-template-columns: 1fr;
  }

  .algorithm-detail > div + div {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 15px;
  }

  .mistake-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .reference-jump {
    align-items: stretch;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .reference-jump a {
    border-bottom: 1px solid var(--line);
    padding: 5px 0;
  }

  .router-steps,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .route-step,
  .metric-grid article {
    min-height: 0;
  }

  .section-heading {
    gap: 10px;
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .source-columns {
    columns: 1;
  }
}

@media print {
  .reference-jump {
    display: none;
  }

  .reference-section {
    break-before: auto;
  }

  .algorithm-card {
    break-inside: avoid;
  }

  .algorithm-card:not([open]) > :not(summary) {
    display: grid !important;
  }

  .algorithm-card summary::after {
    display: none;
  }

  .algorithm-detail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}