:root {
  --ink: #0e1614;
  --ink-soft: #1c2a26;
  --fog: #d8e4de;
  --paper: #e8f0eb;
  --paper-deep: #c5d4cc;
  --accent: #c47a2c;
  --accent-soft: #e8b574;
  --danger: #a63d3d;
  --ok: #2f6b4f;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'Outfit', system-ui, sans-serif;
  --radius: 2px;
  --shadow: 0 24px 60px rgba(14, 22, 20, 0.35);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Wheel/trackpad scroll stays; never show vertical (or horizontal) scrollbars. */
* {
  scrollbar-width: none;
  -ms-overflow-style: none;
}

*::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  color: var(--fog);
  background: var(--ink);
  line-height: 1.5;
}

body[data-theme='light'] {
  /* Soft day: dim sage ground, charcoal type — not paper-white */
  --ink: #c2cbc5;
  --ink-soft: #b4beb8;
  --fog: #1a2420;
  --paper: #15201c;
  --paper-deep: #3a4842;
  --accent: #9a5c1f;
  --accent-soft: #b8732a;
  color: var(--fog);
  background: var(--ink);
}

body[data-theme='light'] .atmosphere {
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(154, 92, 31, 0.1), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(47, 107, 79, 0.09), transparent 50%),
    linear-gradient(165deg, #b8c2bc 0%, #aeb8b2 45%, #c0c9c3 100%);
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(196, 122, 44, 0.22), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(47, 107, 79, 0.18), transparent 50%),
    linear-gradient(165deg, #0a1210 0%, #12201c 45%, #0e1614 100%);
}

.workspace-chrome {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem 1rem;
  flex-shrink: 0;
  padding: 0.45rem 1rem;
  border-bottom: 1px solid rgba(216, 228, 222, 0.12);
  background: rgba(14, 22, 20, 0.55);
  z-index: 20;
}

.workspace-chrome-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.workspace-chrome-right {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-left: auto;
  flex-shrink: 0;
}

.rail-toggle {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.85rem;
  height: 1.85rem;
  padding: 0;
  border: 1px solid rgba(216, 228, 222, 0.25);
  background: transparent;
  color: var(--paper-deep);
  cursor: pointer;
  border-radius: var(--radius);
}

.rail-toggle:hover,
.rail-toggle:focus-visible {
  border-color: var(--accent-soft);
  color: var(--paper);
  outline: none;
}

.rail-toggle-icon {
  width: 1rem;
  height: 1rem;
  display: block;
}

.layout.layout--rail-collapsed .rail-toggle:not(.rail-toggle--refs) .rail-toggle-icon {
  opacity: 0.55;
}

.layout:not(.layout--refs-open) .rail-toggle--refs .rail-toggle-icon {
  opacity: 0.55;
}

.mode-bar {
  display: flex;
  gap: 0.35rem;
  margin-top: 0;
}

.mode-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid rgba(216, 228, 222, 0.25);
  background: transparent;
  color: var(--fog);
  cursor: pointer;
  border-radius: var(--radius);
}

.mode-btn.is-active {
  background: rgba(196, 122, 44, 0.22);
  border-color: var(--accent-soft);
  color: var(--paper);
}

.mode-btn:hover,
.mode-btn:focus-visible {
  border-color: var(--accent-soft);
  color: var(--paper);
  outline: none;
}

.mode-btn-icon {
  width: 1.05rem;
  height: 1.05rem;
  display: block;
}

.solver {
  display: flex;
  justify-content: center;
  animation: rise 0.55s ease-out both;
}

.workspace-solve {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--accent-soft);
  background: rgba(196, 122, 44, 0.28);
  color: var(--paper);
  cursor: pointer;
  border-radius: var(--radius);
}

.workspace-solve:hover {
  background: rgba(196, 122, 44, 0.4);
}

.workspace-message {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: #e8a0a0;
  max-width: 36rem;
  text-align: center;
}

.provenance-badge[data-provenance='workspace'] {
  border-color: rgba(47, 107, 79, 0.55);
  color: #9dceb4;
  background: rgba(47, 107, 79, 0.14);
}

.domain-tree {
  display: grid;
  gap: 0.35rem;
}

.domain-root-label {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper);
}

.domain-toggle {
  appearance: none;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: var(--fog);
  font-family: var(--font-body);
  padding: 0.4rem 0.45rem;
  border-radius: var(--radius);
  cursor: pointer;
}

.domain-toggle:hover {
  background: rgba(216, 228, 222, 0.06);
  border-color: rgba(216, 228, 222, 0.12);
}

.domain-toggle-mark {
  width: 0.85rem;
  color: var(--accent-soft);
  font-size: 0.75rem;
}

.domain-toggle-title {
  flex: 1;
  font-weight: 600;
  font-size: 0.92rem;
}

.domain-toggle-meta {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--paper-deep);
  opacity: 0.85;
}

.domain-children {
  list-style: none;
  margin: 0.15rem 0 0.55rem;
  padding: 0 0 0 0.85rem;
  display: grid;
  gap: 0.3rem;
}

.domain-empty-note {
  margin: 0.15rem 0 0.55rem 1.25rem;
  font-size: 0.8rem;
  color: var(--paper-deep);
}

.family-row.family-item--active .family-item-title {
  color: var(--paper);
}

.domain-node--map .domain-toggle-title {
  opacity: 1;
}

.domain-node--map .family-item--map {
  cursor: default;
  opacity: 0.92;
}

.domain-node--horizon .domain-toggle-title {
  opacity: 0.92;
}

.domain-node--horizon .domain-toggle-meta {
  color: var(--accent-soft);
}

.domain-node--curriculum .domain-toggle-title {
  opacity: 1;
}

.domain-node--curriculum .domain-toggle-meta {
  color: var(--accent-soft);
}

.domain-children--includes {
  list-style: none;
  margin: 0.1rem 0 0.35rem;
  padding: 0 0 0 0.95rem;
  display: grid;
  gap: 0.2rem;
}

.curriculum-section-row > .family-row-head .family-item-title {
  font-weight: 600;
}

.domain-children--discipline {
  margin-top: 0.2rem;
  padding-left: 0.55rem;
  display: grid;
  gap: 0.25rem;
}

.domain-node--discipline > .domain-algebra-head .domain-toggle-title {
  font-size: 0.98rem;
}

.stage-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}

@media (min-width: 1100px) {
  .stage-split:has(#panel:not([hidden])):has(#projections:not([hidden])) {
    grid-template-columns: minmax(0, 1fr) minmax(14rem, 18rem);
  }
}

.projections {
  padding: 0.85rem 0.9rem 1rem;
  border: 1px solid rgba(216, 228, 222, 0.14);
  background: rgba(14, 22, 20, 0.45);
  border-radius: var(--radius);
}

.projections[hidden] {
  display: none;
}

.proj-block + .proj-block {
  margin-top: 1.15rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(216, 228, 222, 0.1);
}

.proj-heading {
  margin: 0 0 0.55rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.proj-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.proj-empty {
  margin: 0;
  font-size: 0.85rem;
}

.proj-link,
.local-graph-node {
  appearance: none;
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid rgba(216, 228, 222, 0.14);
  background: rgba(216, 228, 222, 0.04);
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 0.4rem 0.55rem;
  border-radius: var(--radius);
  cursor: pointer;
}

.proj-link:hover,
.local-graph-node:hover {
  border-color: rgba(196, 122, 44, 0.45);
  color: var(--paper);
}

.proj-kind {
  display: inline-block;
  margin-right: 0.35rem;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.local-graph-label {
  margin: 0 0 0.35rem;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.local-graph-problem {
  margin: 0;
  font-size: 0.9rem;
  color: var(--paper);
}

.local-graph-arrow {
  margin: 0.35rem 0;
  color: var(--accent-soft);
  opacity: 0.7;
  font-size: 0.85rem;
}

.local-graph-nodes {
  display: grid;
  gap: 0.3rem;
}

body[data-evidence-mode='workspace'] .walk-head-review {
  opacity: 0.55;
}

.novel-controls {
  margin-top: 0.75rem;
  display: none;
  flex-direction: column;
  gap: 0.45rem;
  align-items: flex-start;
  max-width: 18rem;
}

.novel-controls:not([hidden]) {
  display: flex;
}

.novel-seed-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.novel-seed-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-soft);
}

.novel-seed {
  width: 4.25rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.3rem 0.4rem;
  border: 1px solid rgba(216, 228, 222, 0.3);
  background: rgba(14, 22, 20, 0.6);
  color: var(--paper);
  border-radius: var(--radius);
}

.novel-seed-refresh {
  width: 1.85rem;
  height: 1.85rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  border: 1px solid rgba(216, 228, 222, 0.3);
  background: rgba(14, 22, 20, 0.45);
  color: var(--paper);
  cursor: pointer;
  border-radius: var(--radius);
}

.novel-seed-refresh:hover {
  border-color: var(--accent-soft);
  color: var(--accent-soft);
}

.novel-btn {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.4rem 0.65rem;
  border: 1px solid rgba(216, 228, 222, 0.3);
  background: rgba(47, 107, 79, 0.25);
  color: var(--paper);
  cursor: pointer;
  border-radius: var(--radius);
}

.novel-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.novel-btn--approve {
  background: rgba(196, 122, 44, 0.28);
  border-color: var(--accent-soft);
}

.novel-status {
  flex: 1 1 100%;
  margin: 0;
  font-size: 0.72rem;
  color: var(--fog);
  opacity: 0.85;
  line-height: 1.35;
}

.provenance-badge {
  display: inline-block;
  margin: 0 0 0.35rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid rgba(216, 228, 222, 0.35);
  color: var(--accent-soft);
  border-radius: var(--radius);
}

.provenance-badge[hidden] {
  display: none;
}

.provenance-badge[data-provenance='novel'] {
  border-color: var(--accent);
  color: var(--accent-soft);
  background: rgba(196, 122, 44, 0.15);
}

.layout {
  display: grid;
  grid-template-columns: minmax(15rem, 17.5rem) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: stretch;
  width: 100%;
  max-width: none;
  margin: 0;
  flex: 1;
  min-height: 0;
  height: auto;
  padding: 0.65rem 1rem 0 0.65rem;
  overflow: hidden;
}

.layout.layout--refs-open {
  grid-template-columns: minmax(15rem, 17.5rem) minmax(0, 1fr) minmax(13.5rem, 16rem);
  padding-right: 0.65rem;
}

.layout.layout--rail-collapsed {
  grid-template-columns: 0 minmax(0, 1fr);
  gap: 0;
  padding-inline: 1.25rem;
}

.layout.layout--rail-collapsed.layout--refs-open {
  grid-template-columns: 0 minmax(0, 1fr) minmax(13.5rem, 16rem);
  gap: 0 1.25rem;
  padding-inline: 1.25rem 0.65rem;
}

.layout.layout--rail-collapsed .rail-catalog {
  display: none !important;
}

.layout.layout--rail-collapsed .rail {
  padding-right: 0;
  border-right-color: transparent;
  overflow: hidden;
  width: 0;
  min-width: 0;
}

.layout.layout--rail-collapsed .stage {
  margin-inline: auto;
  padding-inline: 0.75rem;
  width: 100%;
}

.layout:not(.layout--refs-open) .refs-rail {
  display: none;
}

.refs-rail {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
  padding: 0 0 0 0.35rem;
  border-left: 1px solid rgba(216, 228, 222, 0.12);
  animation: rise 0.55s ease-out both;
  overflow: hidden;
}

.refs-rail-inner {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.refs-rail-heading {
  margin: 0 0 0.55rem;
  padding: 0.15rem 0.35rem 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.refs-rail-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 0 0.15rem 1rem;
}

.refs-rail-empty {
  margin: 0.35rem 0.35rem 0;
  font-size: 0.85rem;
  line-height: 1.4;
}

.help-links-section {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.15rem 0.15rem 0.5rem;
}

.help-links-section .refs-rail-group-title {
  margin: 0;
  padding: 0 0.2rem;
}

.help-links-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
  padding: 0 0.2rem;
}

.help-links-head .refs-rail-group-title {
  padding: 0;
}

.refs-rail-rule {
  border: none;
  border-top: 1px solid rgba(216, 228, 222, 0.18);
  margin: 0.85rem 0.35rem 0.65rem;
}

.help-links-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.help-link-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0 0.2rem;
}

.help-link-anchor {
  flex: 1;
  min-width: 0;
  color: var(--accent-soft);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.help-link-anchor:hover {
  color: var(--fog);
}

.help-link-input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 0.84rem;
  color: var(--fog);
  background: rgba(216, 228, 222, 0.06);
  border: 1px solid rgba(216, 228, 222, 0.18);
  border-radius: var(--radius);
  padding: 0.35rem 0.45rem;
}

.help-link-input:focus {
  outline: 1px solid color-mix(in srgb, var(--accent-soft) 55%, transparent);
  border-color: color-mix(in srgb, var(--accent-soft) 45%, transparent);
}

.help-link-remove {
  flex-shrink: 0;
  width: 1.6rem;
  height: 1.6rem;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: color-mix(in srgb, var(--fog) 55%, transparent);
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
}

.help-link-remove:hover {
  color: var(--danger);
  background: rgba(216, 228, 222, 0.08);
}

.help-link-add {
  flex-shrink: 0;
  width: 1.55rem;
  height: 1.55rem;
  border: 1px solid rgba(216, 228, 222, 0.22);
  background: transparent;
  color: var(--fog);
  font: inherit;
  font-size: 1.05rem;
  font-weight: 650;
  line-height: 1;
  padding: 0;
  border-radius: var(--radius);
  cursor: pointer;
}

.help-link-add:hover {
  background: rgba(216, 228, 222, 0.08);
}

.refs-rail-group {
  margin: 0 0 0.85rem;
}

.refs-rail-group-title {
  margin: 0 0 0.35rem;
  padding: 0 0.35rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fog);
  opacity: 0.9;
}

.refs-rail .tree-ref-list {
  margin: 0;
  padding: 0;
}

.rail {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
  padding: 0 0.35rem 0 0;
  border-right: 1px solid rgba(216, 228, 222, 0.12);
  /* No opacity entrance — subjects must paint immediately (never blank). */
  overflow: hidden;
}

.rail-catalog {
  flex: 1 1 auto;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 0 0 1.5rem;
}

.catalog {
  padding: 0.15rem 0 0;
}

.catalog-label {
  margin: 0 0 0.55rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.catalog-hint {
  letter-spacing: 0.04em;
  text-transform: none;
  font-weight: 500;
  color: var(--accent-soft);
  opacity: 0.85;
}

.catalog-label--problems {
  margin-top: 1.35rem;
}

body[data-evidence-mode='novel'] .problem-picker {
  opacity: 0.85;
}

body[data-evidence-mode='novel'] .problem-num {
  cursor: default;
}

.family-list {
  display: grid;
  gap: 0.35rem;
}

.family-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition:
    background 0.15s ease,
    border-color 0.15s ease;
}

.family-row:hover {
  background: rgba(216, 228, 222, 0.06);
  border-color: rgba(216, 228, 222, 0.12);
}

.family-row.family-item--active {
  background: transparent;
  border-color: transparent;
}

.family-item {
  appearance: none;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-align: left;
  border: none;
  background: transparent;
  color: var(--fog);
  font-family: var(--font-body);
  padding: 0.45rem 0.55rem;
  border-radius: var(--radius);
  cursor: pointer;
}

.family-row--open {
  border-color: transparent;
  background: transparent;
}

.domain-children--drilled {
  padding-left: 0;
}

.tree-problem-list {
  list-style: none;
  margin: 0;
  padding: 0.05rem 0 0.35rem 1.35rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.1rem;
  width: 100%;
}

.tree-problem-row {
  margin: 0;
  width: 100%;
}

.tree-problem-head {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  width: 100%;
}

.tree-problem-head .tree-problem {
  flex: 1 1 auto;
  min-width: 0;
}

.tree-problem {
  appearance: none;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.45rem;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: var(--fog);
  font-family: var(--font-body);
  padding: 0.32rem 0.45rem;
  border-radius: var(--radius);
  cursor: pointer;
}

.tree-problem-channels {
  display: inline-grid;
  grid-template-rows: 0.45rem 0.45rem 0.45rem;
  gap: 0.14rem;
  align-content: center;
  flex-shrink: 0;
}

.scan-chrome {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.65rem;
  margin: 0 0 0.55rem;
  padding: 0 0.15rem;
}

.scan-conventions-btn {
  appearance: none;
  border: 1px solid rgba(216, 228, 222, 0.35);
  background: rgba(12, 28, 24, 0.45);
  color: var(--paper);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
}

.scan-conventions-btn:hover {
  border-color: rgba(230, 200, 77, 0.55);
  color: var(--accent-soft);
}

.scan-conventions-btn:disabled {
  opacity: 0.55;
  cursor: wait;
}

.scan-totals {
  font-size: 0.72rem;
}

.scan-totals .scan-yellow {
  color: #e6c84d;
  font-weight: 600;
}

.scan-totals .scan-red {
  color: #e85d5d;
  font-weight: 600;
}

.scan-legend {
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  width: 100%;
}

.tree-problem:hover {
  background: rgba(216, 228, 222, 0.08);
  border-color: rgba(216, 228, 222, 0.12);
}

.tree-problem--active {
  background: rgba(196, 122, 44, 0.18);
  border-color: rgba(196, 122, 44, 0.4);
  color: var(--paper);
}

.tree-problem-label {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1;
}

.family-item-main {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
}

.family-item-main .problem-dot {
  margin-top: 0.35rem;
}

.family-item-text {
  min-width: 0;
  flex: 1;
}

.family-row-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.25rem;
}

.domain-algebra-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.25rem;
}

.family-copy {
  appearance: none;
  align-self: center;
  margin-right: 0.35rem;
  border: 1px solid rgba(216, 228, 222, 0.22);
  background: transparent;
  color: var(--accent-soft);
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.28rem 0.45rem;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
}

.family-copy--icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  padding: 0;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  line-height: 1;
  border-radius: 0.2rem;
}

.family-copy--icon .copy-icon {
  display: block;
  flex-shrink: 0;
}

.family-copy:hover {
  border-color: var(--accent-soft);
  color: var(--paper);
}

.family-copy--ok {
  border-color: var(--ok);
  color: var(--ok);
}

.family-copy--fail {
  border-color: var(--danger);
  color: var(--danger);
}

.curriculum-spec-mark {
  align-self: center;
  flex-shrink: 0;
  margin-right: 0.25rem;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1;
}

.curriculum-spec-mark--ok {
  color: var(--ok);
}

.curriculum-spec-mark--no {
  color: var(--danger);
}

.pedagogy-clear-mark {
  align-self: center;
  flex-shrink: 0;
  margin-right: 0.25rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1;
}

.pedagogy-clear-mark--no {
  color: var(--danger);
}

.pedagogy-clear-mark--ok {
  color: var(--ok);
}

button.pedagogy-clear-mark {
  appearance: none;
  padding: 0.1rem 0.2rem;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 0.2rem;
}

button.pedagogy-clear-mark:hover {
  background: rgba(216, 228, 222, 0.1);
}

span.pedagogy-clear-mark {
  padding: 0.1rem 0.2rem;
  cursor: default;
  user-select: none;
}

.family-item-title {
  display: block;
  font-size: 0.88rem;
  font-weight: 560;
  color: var(--paper);
  line-height: 1.3;
}

.family-item-meta {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.72rem;
  color: var(--paper-deep);
}

.family-row.family-item--empty .family-item-title {
  color: var(--paper-deep);
}

.family-row.family-item--empty .family-item-meta {
  color: var(--danger);
}

.catalog-empty--fail {
  margin: 0.25rem 0 0;
  font-size: 0.88rem;
  font-weight: 560;
  color: var(--accent-soft);
  line-height: 1.4;
}

.stage {
  max-width: 76rem;
  margin: 0;
  padding: 1.35rem 0.5rem 2.5rem 0;
  min-height: 0;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
}

@media (max-width: 860px) {
  html,
  body {
    height: auto;
    overflow: auto;
  }

  .layout {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
    padding: 0 0.75rem 3rem;
  }

  .layout.layout--refs-open {
    grid-template-columns: 1fr;
  }

  .layout.layout--rail-collapsed {
    grid-template-columns: 2.35rem minmax(0, 1fr);
    gap: 0.65rem;
  }

  .layout.layout--rail-collapsed.layout--refs-open {
    grid-template-columns: 2.35rem minmax(0, 1fr);
  }

  .layout.layout--rail-collapsed .rail {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
  }

  .refs-rail {
    height: auto;
    max-height: none;
    overflow: visible;
    border-left: none;
    border-top: 1px solid rgba(216, 228, 222, 0.12);
    padding: 1rem 0 0;
    margin-top: 0.5rem;
  }

  .rail {
    height: auto;
    max-height: none;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid rgba(216, 228, 222, 0.12);
    padding-bottom: 1rem;
    margin-bottom: 0.5rem;
  }

  .rail-catalog {
    overflow: visible;
    padding-bottom: 0;
  }

  .stage {
    height: auto;
    overflow: visible;
    padding-bottom: 0;
  }

  .family-list {
    grid-template-columns: repeat(auto-fill, minmax(9.5rem, 1fr));
  }
}

.hero {
  animation: rise 0.7s ease-out both;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 400;
  color: var(--paper);
}

.hero h1[hidden] {
  display: none;
}

.subject-overview {
  margin: 0.35rem 0 0;
  max-width: min(64rem, 100%);
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.subject-overview-block {
  margin: 0;
  padding: 0;
  border: none;
}

.subject-overview-heading {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--paper);
}

.subject-overview-body {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.55;
  color: color-mix(in srgb, var(--fog) 88%, transparent);
}

.subject-overview-hint,
.subject-overview-empty {
  margin: 0.15rem 0 0;
  max-width: min(64rem, 100%);
  font-size: 0.9rem;
  line-height: 1.45;
}

.level-overview {
  margin: 0.35rem 0 0;
  max-width: min(64rem, 100%);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

/* Critique submit lives in a right gutter — never over body copy. */
.level-overview:has(.overview-critique-submit-bar) {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 5.75rem;
  column-gap: 0.85rem;
  align-items: start;
  max-width: min(70rem, 100%);
}

.level-overview:has(.overview-critique-submit-bar) > *:not(.overview-critique-submit-bar) {
  grid-column: 1;
}

.level-overview-kicker {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--paper);
}

.level-overview-body {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.55;
  color: color-mix(in srgb, var(--fog) 88%, transparent);
}

.level-overview-outcomes {
  list-style: disc;
  margin: 0;
  padding: 0 0 0 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  max-width: none;
}

.level-overview-outcomes li {
  font-size: 0.98rem;
  line-height: 1.45;
  color: color-mix(in srgb, var(--fog) 90%, transparent);
}

.level-overview-meta {
  margin: 0;
  font-size: 0.88rem;
}

.overview-critique {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.overview-critique-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--fog) 70%, transparent);
}

.overview-critique-text {
  width: 100%;
  max-width: min(64rem, 100%);
}

.subject-overview-block + .subject-overview-block,
.subject-overview-block + .overview-critique {
  margin-top: 0.35rem;
  padding-top: 0.85rem;
  border-top: 1px solid color-mix(in srgb, var(--fog) 12%, transparent);
}

.overview-critique[data-overview-facet='general'] {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in srgb, var(--fog) 18%, transparent);
}

.overview-critique-submit-bar {
  grid-column: 2;
  grid-row: 1;
  position: sticky;
  top: 0.5rem;
  z-index: 30;
  display: flex;
  justify-content: flex-end;
  align-self: start;
  margin: 0;
  pointer-events: none;
}

.overview-critique-submit-sticky {
  pointer-events: auto;
  box-shadow: 0 8px 24px rgba(14, 22, 20, 0.35);
}

.overview-critique-submit-sticky:disabled {
  opacity: 0.45;
  cursor: default;
  box-shadow: none;
}

@media (max-width: 860px) {
  .level-overview:has(.overview-critique-submit-bar) {
    grid-template-columns: minmax(0, 1fr);
  }

  .overview-critique-submit-bar {
    grid-column: 1;
    grid-row: auto;
    justify-content: flex-end;
    margin: 0 0 0.35rem;
  }
}

.subject-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.subject-toc-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.subject-toc-link {
  flex: 1;
  display: grid;
  grid-template-columns: 2.25rem 1fr auto;
  align-items: baseline;
  gap: 0.65rem;
  margin: 0;
  padding: 0.45rem 0.55rem;
  border: none;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.subject-toc-link:hover:not(:disabled) {
  background: color-mix(in srgb, var(--paper) 6%, transparent);
}

.subject-toc-link:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.subject-toc-num {
  font-variant-numeric: tabular-nums;
  color: color-mix(in srgb, var(--fog) 70%, transparent);
}

.subject-toc-title {
  font-family: var(--font-display);
}

.subject-toc-meta {
  font-size: 0.85rem;
  color: color-mix(in srgb, var(--fog) 72%, transparent);
}

.tree-problem-label--overview {
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.prompt-text {
  margin: 0.65rem 0 0;
  max-width: min(64rem, 100%);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 400;
  line-height: 1.35;
  color: var(--fog);
}

.prompt-text[hidden] {
  display: none;
}

.prompt-eq {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.5vw, 2.75rem);
  font-style: italic;
  line-height: 1.25;
  color: var(--accent-soft);
  overflow: visible;
}

.prompt-eq--customizable {
  cursor: pointer;
  border-radius: 4px;
  outline-offset: 4px;
}

.prompt-eq--customizable:hover {
  color: var(--accent);
}

.prompt-eq--customizable:focus-visible {
  outline: 2px solid rgba(140, 190, 160, 0.7);
}

.prompt-eq--customizable[aria-expanded='true'] {
  color: var(--accent);
}

.viewspec-panel {
  margin: 1.1rem 0 0;
  max-width: 26rem;
}

.viewspec-panel--after-walk {
  margin: 1.25rem 0 0;
}

.viewspec-panel[hidden] {
  display: none;
}

.viewspec-figure {
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
}

.viewspec-figure + .viewspec-figure {
  margin-top: 0.75rem;
}

.viewspec-figure .mv-svg {
  display: block;
  width: 100%;
  height: auto;
}

.viewspec-figure--vlt {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  max-width: 22rem;
}

.vlt-probe {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.vlt-probe-label {
  font-size: 0.85rem;
  color: var(--muted, #9aaba3);
}

.vlt-slider {
  width: 100%;
  accent-color: #7ec8e3;
}

.mv-vlt-probe {
  stroke: #7ec8e3;
  stroke-width: 2;
  stroke-dasharray: 5 4;
  fill: none;
  pointer-events: none;
}

.problem-picker {
  margin: 0 0 0.85rem;
}

.customize-panel {
  margin-top: 1.15rem;
  max-width: 36rem;
}

.customize-body {
  border: 1px solid rgba(216, 228, 222, 0.18);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem 0.85rem;
  background: rgba(14, 22, 20, 0.35);
}

.customize-hint {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  line-height: 1.4;
}

.customize-shell {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.35rem 0.45rem;
  margin-bottom: 0.85rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--paper);
}

.customize-slot {
  display: grid;
  gap: 0.25rem;
}

.customize-slot-label {
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.customize-input {
  width: 3.25rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  padding: 0.35rem 0.45rem;
  border: 1px solid rgba(216, 228, 222, 0.35);
  background: rgba(14, 22, 20, 0.65);
  color: var(--paper);
  border-radius: var(--radius);
  text-align: center;
}

.customize-input--var {
  width: 2.25rem;
}

.customize-input--rel {
  width: 2.75rem;
}

.customize-input--select {
  width: auto;
  min-width: 9.5rem;
  text-align: left;
  cursor: pointer;
}

.customize-input:focus {
  outline: 2px solid rgba(196, 122, 44, 0.55);
  outline-offset: 1px;
}

.customize-locked {
  padding-bottom: 0.4rem;
  color: var(--fog);
  opacity: 0.85;
  user-select: none;
}

.customize-actions {
  display: flex;
  gap: 0.5rem;
}

.customize-leave {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--fog);
  line-height: 1.45;
}

.customize-leave-btn {
  appearance: none;
  margin-left: 0.35rem;
  padding: 0;
  border: none;
  background: none;
  color: var(--accent-soft);
  font-family: var(--font-body);
  font-size: inherit;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

.problem-picker-legend {
  display: inline-grid;
  grid-template-rows: 0.55rem 0.55rem;
  gap: 0.2rem;
  align-content: start;
  margin: 0 0.75rem 0.15rem 0;
  vertical-align: top;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper-deep);
  line-height: 0.55rem;
}

.problem-list {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.15rem 0.35rem;
  vertical-align: top;
}

.problem-cell {
  display: grid;
  grid-template-rows: auto auto auto;
  justify-items: center;
  align-items: center;
  gap: 0.2rem;
  min-width: 1.75rem;
}

.problem-num {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.75rem;
  height: auto;
  padding: 0.15rem 0.35rem 0.2rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  line-height: 1;
}

.problem-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  flex-shrink: 0;
}

.problem-dot--pending,
.problem-dot--ux-open,
.problem-dot--pedagogy-caution {
  background: #e6c84d;
  box-shadow: 0 0 0 1px rgba(230, 200, 77, 0.35);
}

.problem-dot--passed,
.problem-dot--ux-pass,
.problem-dot--pedagogy-clear {
  background: #3dd68c;
  box-shadow: 0 0 0 1px rgba(61, 214, 140, 0.35);
}

.problem-dot--pedagogy-blocker {
  background: #e85d5d;
  box-shadow: 0 0 0 1px rgba(232, 93, 93, 0.4);
}

.problem-dot--pedagogy-polish {
  background: rgba(216, 228, 222, 0.55);
  box-shadow: 0 0 0 1px rgba(216, 228, 222, 0.25);
}

.problem-dot--pedagogy-open,
.problem-dot--pressure-neutral {
  background: rgba(216, 228, 222, 0.35);
  box-shadow: none;
}

.problem-dot--pressure-tested {
  background: #5bb8a8;
  box-shadow: 0 0 0 1px rgba(91, 184, 168, 0.4);
}

.problem-dot--pressure-caution {
  background: #e6c84d;
  box-shadow: 0 0 0 1px rgba(230, 200, 77, 0.35);
}

.problem-dot--pressure-fail {
  background: #e85d5d;
  box-shadow: 0 0 0 1px rgba(232, 93, 93, 0.4);
}

.problem-dot--math-pass {
  background: #3dd68c;
  box-shadow: 0 0 0 1px rgba(61, 214, 140, 0.35);
}

.problem-dot--math-soft {
  background: #d4a017;
  box-shadow: 0 0 0 1px rgba(212, 160, 23, 0.45);
}

.problem-dot--math-fail {
  background: #e85d5d;
  box-shadow: 0 0 0 1px rgba(232, 93, 93, 0.4);
}

.problem-dot--math-unchecked {
  background: rgba(216, 228, 222, 0.35);
  box-shadow: none;
}

.problem-dot--novel {
  background: rgba(216, 228, 222, 0.35);
  box-shadow: none;
}

.family-row--novel {
  grid-template-columns: minmax(0, 1fr);
}

.problem-num-label {
  line-height: 1;
}

.problem-num:hover {
  color: var(--paper);
}

.problem-num--active,
.problem-cell--active .problem-num {
  color: var(--accent-soft);
}

.problem-sep {
  color: var(--paper-deep);
  opacity: 0.7;
  user-select: none;
  font-size: 0.85rem;
  align-self: flex-end;
  padding-bottom: 0.35rem;
}

.walk-col--ref,
.walk-why-ref {
  position: relative;
}

.walk-why-ref {
  margin-top: 0.65rem;
}

.walk-col--ref-math-fail,
.walk-why-ref--math-fail {
  outline: 1px solid rgba(232, 93, 93, 0.45);
  outline-offset: 2px;
  border-radius: 4px;
}

.ref-math-fail {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-right: 0.35rem;
  border-radius: 50%;
  background: #e85d5d;
  box-shadow: 0 0 0 1px rgba(232, 93, 93, 0.4);
  vertical-align: middle;
}

.tree-ref-list {
  list-style: none;
  margin: 0.3rem 0 0.45rem 0.55rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.tree-ref-card {
  appearance: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.05rem;
  width: 100%;
  text-align: left;
  border: 1px solid rgba(216, 228, 222, 0.16);
  border-radius: 6px;
  background: rgba(216, 228, 222, 0.06);
  color: var(--accent-soft);
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 500;
  padding: 0.32rem 0.45rem;
  cursor: pointer;
}

.tree-ref-card:hover,
.tree-ref-card:focus-visible {
  background: rgba(196, 122, 44, 0.18);
  border-color: rgba(196, 122, 44, 0.35);
}

.tree-ref-card:focus-visible {
  outline: 2px solid rgba(140, 190, 160, 0.7);
  outline-offset: 1px;
}

.tree-ref-kind {
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.tree-ref-title {
  line-height: 1.25;
  color: inherit;
}

.pb-vehicle-row {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.15rem;
}

.panel {
  margin-top: 2rem;
  padding-top: 0;
  border-top: none;
  animation: rise 0.45s ease-out both;
}

.panel[hidden] {
  display: none;
}

.walk-head {
  display: grid;
  grid-template-columns: minmax(12rem, 1.5fr) minmax(0, 1.15fr) minmax(16rem, 2.4fr);
  gap: 1rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid rgba(216, 228, 222, 0.18);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

/* Author display:grid beats UA [hidden]; overviews must not keep Work/Why chrome. */
.walk-head[hidden] {
  display: none;
}

body[data-critique='off'] .walk-head {
  grid-template-columns: minmax(14rem, 2.2fr) minmax(0, 1.55fr);
}

body[data-critique='off'] .walk-head-review,
.walk-head-review[hidden],
[data-critique-only][hidden] {
  display: none !important;
}

.lens-bar {
  margin-top: 0;
}

.critique-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  user-select: none;
}

.critique-pill-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.critique-pill-track {
  display: inline-flex;
  padding: 0.12rem;
  border: 1px solid rgba(216, 228, 222, 0.25);
  border-radius: 999px;
  background: rgba(14, 22, 20, 0.45);
  gap: 0;
}

.critique-pill-btn {
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  min-width: 2.6rem;
  padding: 0.28rem 0.7rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--paper-deep);
  cursor: pointer;
}

.critique-pill-btn:hover,
.critique-pill-btn:focus-visible {
  color: var(--paper);
  outline: none;
}

.critique-pill-btn[aria-pressed='true'] {
  background: rgba(196, 122, 44, 0.28);
  color: var(--paper);
}

body[data-critique='on'] .critique-pill-btn[data-critique-pill='on'][aria-pressed='true'] {
  background: rgba(196, 122, 44, 0.32);
  color: var(--paper);
}

.shell-page {
  padding: 1.5rem 0.25rem 2rem;
  animation: rise 0.35s ease-out both;
}

.shell-page-inner {
  max-width: 40rem;
}

.shell-page-back {
  font: inherit;
  font-size: 0.85rem;
  color: var(--accent-soft);
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
  margin-bottom: 1rem;
}

.shell-page-back:hover,
.shell-page-back:focus-visible {
  text-decoration: underline;
  outline: none;
}

.shell-page-title {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  color: var(--paper);
}

.shell-page-body {
  margin: 0 0 1.25rem;
  line-height: 1.55;
}

.shell-page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.shell-page-inner--shortcuts {
  max-width: 36rem;
}

.shell-shortcut-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin: 0 0 1rem;
}

.shell-shortcut-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.45rem 0.15rem;
  border-bottom: 1px solid rgba(216, 228, 222, 0.12);
}

.shell-shortcut-label {
  font-size: 0.92rem;
  color: var(--paper);
  line-height: 1.35;
}

.shell-shortcut-key {
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  min-width: 3.25rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid rgba(216, 228, 222, 0.28);
  border-radius: 4px;
  background: rgba(14, 22, 20, 0.55);
  color: var(--accent-soft);
  cursor: pointer;
  text-align: center;
}

.shell-shortcut-key:hover,
.shell-shortcut-key:focus-visible {
  border-color: var(--accent-soft);
  outline: none;
}

.shell-shortcut-key.is-capturing {
  border-color: var(--accent-soft);
  color: var(--paper);
  background: rgba(196, 122, 44, 0.22);
  animation: shell-shortcut-pulse 1.1s ease-in-out infinite;
}

@keyframes shell-shortcut-pulse {
  50% {
    opacity: 0.72;
  }
}

.shell-shortcut-status {
  min-height: 1.25rem;
  margin: 0 0 0.85rem;
  font-size: 0.85rem;
}

.shell-shortcut-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.shell-auth-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  max-width: 22rem;
  margin-top: 0.5rem;
}

.shell-auth-label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--ink-muted, var(--muted));
}

.shell-auth-input {
  font: inherit;
  font-size: 0.95rem;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line, rgba(255, 255, 255, 0.18));
  border-radius: 4px;
  background: var(--panel, transparent);
  color: var(--paper, inherit);
}

.shell-auth-btn {
  font: inherit;
  font-size: 0.9rem;
  padding: 0.5rem 0.85rem;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
  background: var(--accent, #c47a2c);
  color: var(--paper, #fff);
  align-self: flex-start;
}

.shell-auth-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.shell-auth-btn--secondary {
  background: transparent;
  color: var(--accent-soft, var(--accent, #c47a2c));
  border: 1px solid var(--line, rgba(255, 255, 255, 0.22));
}

.shell-auth-error {
  margin: 0;
  color: var(--danger, #c44);
  min-height: 1.2em;
}

.shell-profile-meta {
  margin: 0 0 1.25rem;
  display: grid;
  gap: 0.55rem;
}

.shell-profile-meta div {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.shell-profile-meta dt {
  margin: 0;
  color: var(--ink-muted, var(--muted));
}

.shell-profile-meta dd {
  margin: 0;
}

body[data-critique-available='0'] .critique-pill {
  display: none;
}

body[data-lens='curriculum'] .critique-pill {
  display: none !important;
}

.shell-page-nav-item {
  font-size: 0.78rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid rgba(216, 228, 222, 0.2);
  border-radius: var(--radius);
  color: var(--paper-deep);
}

body[data-shell-page] .solver,
body[data-shell-page] .hero,
body[data-shell-page] .panel {
  display: none !important;
}

body[data-shell-page] .workspace-chrome {
  opacity: 0.55;
  pointer-events: none;
}

body[data-lens='curriculum'] [data-custom-only],
body[data-lens='pedagogy'] [data-custom-only] {
  display: none !important;
}

body:not([data-lens='pedagogy']) [data-pedagogy-only] {
  display: none !important;
}

body[data-lens='custom'] [data-curriculum-only],
body[data-lens='custom'] [data-catalog-only] {
  display: none !important;
}

/* Subject filetree stays visible in Custom — never blank the rail. */

.pedagogy-help-links {
  margin: 0;
  padding-left: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.pedagogy-help-links a {
  color: inherit;
  text-underline-offset: 0.15em;
}

.pedagogy-suite-note {
  font-size: 0.78rem;
  line-height: 1.35;
  margin: 0 0 0.75rem;
  padding: 0 0.15rem;
}

.pedagogy-suite-note code {
  font-size: 0.85em;
}

.pedagogy-mode-toggle {
  display: flex;
  gap: 0.25rem;
  margin: 0 0 0.65rem;
  padding: 0 0.1rem;
}

.pedagogy-mode-btn {
  flex: 1;
  border: 1px solid color-mix(in srgb, var(--ink, #1a1a1a) 18%, transparent);
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 550;
  padding: 0.28rem 0.4rem;
  border-radius: 4px;
  cursor: pointer;
}

.pedagogy-mode-btn.is-active {
  border-color: color-mix(in srgb, var(--ink, #1a1a1a) 45%, transparent);
  background: color-mix(in srgb, var(--ink, #1a1a1a) 8%, transparent);
  font-weight: 650;
}

.pedagogy-context {
  font-size: 0.85rem;
  margin: 0 0 0.5rem;
}

.pedagogy-inventory-tree,
.pedagogy-suite-tree {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.pedagogy-tx-entry {
  border-top: 1px solid color-mix(in srgb, var(--ink, #1a1a1a) 12%, transparent);
  padding: 0.25rem 0;
}

.pedagogy-tx-summary,
.pedagogy-problem-summary {
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem 0.55rem;
  list-style: none;
  font-size: 0.82rem;
}

.pedagogy-tx-summary::-webkit-details-marker,
.pedagogy-problem-summary::-webkit-details-marker {
  display: none;
}

.pedagogy-tx-title {
  font-weight: 650;
}

.pedagogy-count {
  font-size: 0.72rem;
  white-space: nowrap;
}

.pedagogy-tx-problems {
  margin: 0.25rem 0 0.15rem 0.55rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.pedagogy-problem-entry {
  padding: 0.1rem 0;
}

.pedagogy-problem-title {
  font-size: 0.78rem;
}

.pedagogy-solutions {
  list-style: none;
  margin: 0.2rem 0 0.15rem 0.4rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.pedagogy-solution-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.05rem;
  text-align: left;
  width: 100%;
}

.pedagogy-sol-title {
  font-size: 0.76rem;
}

.pedagogy-sol-meta {
  font-size: 0.68rem;
}

.pb-entry {
  border-top: 1px solid color-mix(in srgb, var(--ink, #1a1a1a) 12%, transparent);
  padding: 0.25rem 0;
}

.pb-summary {
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.55rem;
  list-style: none;
  font-size: 0.82rem;
}

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

.pb-id {
  font-weight: 650;
  letter-spacing: 0.02em;
}

.pb-title {
  flex: 1 1 8rem;
}

.pb-status {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.75;
}

.pb-status--needs_representative {
  color: color-mix(in srgb, #b45309 80%, var(--ink, #1a1a1a));
}

.pb-status--seeded {
  color: color-mix(in srgb, #1d4ed8 70%, var(--ink, #1a1a1a));
}

.pb-status--green {
  color: color-mix(in srgb, #15803d 75%, var(--ink, #1a1a1a));
}

.pb-def {
  font-size: 0.75rem;
  margin: 0.35rem 0 0.45rem;
  padding-left: 0.15rem;
}

.pb-vehicles {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
}

.pb-vehicles .tree-problem {
  width: 100%;
  text-align: left;
  font-size: 0.78rem;
}

.pb-needs {
  font-size: 0.75rem;
  margin: 0 0 0.4rem;
  padding-left: 0.15rem;
}

.graph-filing-note {
  margin: -0.25rem 0 0.55rem;
  font-size: 0.7rem;
  line-height: 1.35;
}

.catalog-label--spaced {
  margin-top: 1.15rem;
}

.graph-filing-tree {
  /* Match Teach #domain-tree — no nested scrollbar cage */
  max-height: none;
  overflow: visible;
  padding-right: 0;
}

.graph-nb-details {
  margin-top: 1.15rem;
}

.graph-nb-summary {
  cursor: pointer;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fog);
  margin-bottom: 0.55rem;
}

.graph-filing-row-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.25rem;
  align-items: center;
}

.graph-filing-domain {
  margin: 0 0 0.35rem;
}

.graph-filing-folder-btn,
.graph-filing-leaf-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.28rem 0.35rem;
  border: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.8rem;
  cursor: pointer;
  border-radius: var(--radius);
}

.graph-filing-folder-btn {
  font-weight: 600;
  color: var(--fog);
}

.graph-filing-folder-btn:hover,
.graph-filing-leaf-btn:hover,
.graph-filing-folder-btn:focus-visible,
.graph-filing-leaf-btn:focus-visible {
  background: rgba(196, 122, 44, 0.16);
  outline: none;
}

.graph-filing-leaf-btn.is-selected {
  background: rgba(196, 122, 44, 0.28);
  color: var(--paper);
}

.graph-filing-mark {
  display: inline-block;
  width: 0.9rem;
  color: var(--accent-soft);
  opacity: 0.9;
}

.graph-filing-children {
  margin: 0;
  padding: 0 0 0 0.7rem;
  list-style: none;
  border-left: 1px solid rgba(216, 228, 222, 0.12);
}

.graph-filing-ref {
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-soft);
  opacity: 0.8;
  margin-left: 0.35rem;
}

.graph-search-label {
  display: block;
  margin: 0.35rem 0 0.35rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-soft);
  opacity: 0.85;
}

.graph-search {
  width: 100%;
  box-sizing: border-box;
  padding: 0.45rem 0.55rem;
  border: 1px solid rgba(216, 228, 222, 0.28);
  border-radius: var(--radius);
  background: rgba(14, 22, 20, 0.55);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.85rem;
}

.graph-search:focus {
  outline: 1px solid var(--accent-soft);
  border-color: var(--accent-soft);
}

.graph-search-results {
  margin: 0.45rem 0 0.75rem;
  padding: 0;
  list-style: none;
  border: 1px solid rgba(216, 228, 222, 0.18);
  border-radius: var(--radius);
  max-height: 12rem;
  overflow: auto;
}

.graph-search-results button,
.graph-neighbor-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.4rem 0.55rem;
  border: 0;
  border-bottom: 1px solid rgba(216, 228, 222, 0.1);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.82rem;
  cursor: pointer;
}

.graph-search-results button:last-child,
.graph-neighbor-btn:last-child {
  border-bottom: 0;
}

.graph-search-results button:hover,
.graph-neighbor-btn:hover,
.graph-search-results button:focus-visible,
.graph-neighbor-btn:focus-visible {
  background: rgba(196, 122, 44, 0.18);
  outline: none;
}

.graph-search-hit-kind {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-soft);
  opacity: 0.85;
}

.graph-neighborhood {
  margin-top: 0.75rem;
}

.graph-nb-group {
  margin: 0 0 0.85rem;
}

.graph-nb-group h3 {
  margin: 0 0 0.3rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.graph-nb-group ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.graph-nb-group .graph-nb-count {
  margin: 0;
  font-size: 0.8rem;
  color: var(--fog);
  opacity: 0.9;
}

.graph-inspector {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
  animation: rise 0.45s ease-out both;
}

.graph-inspector-identity h1 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  font-weight: 400;
  color: var(--paper);
  line-height: 1.15;
}

.graph-inspector .kind-tag {
  margin: 0 0 0.35rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.graph-ko-id {
  margin: 0 0 0.75rem;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--fog);
  word-break: break-all;
  opacity: 0.85;
}

.graph-inspector-section {
  margin: 1.25rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(216, 228, 222, 0.14);
}

.graph-inspector-section h2 {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.graph-inspector-section ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.graph-inspector-section li {
  margin: 0.2rem 0;
}

.graph-ref-btn {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.55rem;
  padding: 0.2rem 0;
  border: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.92rem;
  cursor: pointer;
  text-align: left;
}

.graph-ref-btn:hover,
.graph-ref-btn:focus-visible {
  color: var(--accent-soft);
  outline: none;
}

.graph-ref-via {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fog);
  opacity: 0.75;
}

.graph-empty {
  margin: 2rem 0;
  max-width: 28rem;
  font-size: 0.95rem;
  line-height: 1.45;
}

.muted {
  color: var(--fog);
  opacity: 0.85;
}

.walk-head-review {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  letter-spacing: 0.12em;
}

.walk-head-review-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  letter-spacing: 0;
}

.walk-review-copy,
.walk-review-submit {
  appearance: none;
  border: 1px solid rgba(196, 122, 44, 0.45);
  background: rgba(196, 122, 44, 0.18);
  color: var(--accent-soft, var(--paper));
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius, 8px);
  cursor: pointer;
}

.walk-review-copy--icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.55rem;
  height: 1.55rem;
  padding: 0;
  letter-spacing: 0;
  text-transform: none;
  border-radius: 0.25rem;
}

.walk-review-copy--icon .copy-icon {
  display: block;
}

.walk-review-copy:hover,
.walk-review-submit:hover {
  background: rgba(196, 122, 44, 0.28);
}

.step-coach-hint {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  line-height: 1.35;
}

.step-coach-label {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-right: 0.35rem;
  opacity: 0.75;
}

.step-coach-reveal {
  margin-top: 0.45rem;
  font: inherit;
  font-size: 0.78rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  border: 1px solid rgba(216, 228, 222, 0.25);
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.walk-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.prompt-review {
  display: grid;
  grid-template-columns: minmax(0, 2.65fr) minmax(16rem, 2.4fr);
  gap: 1rem;
  align-items: start;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(216, 228, 222, 0.1);
}

.prompt-review-main {
  min-width: 0;
}

.prompt-review-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-style: italic;
  line-height: 1.35;
  color: var(--accent-soft);
}

.walk-row {
  display: grid;
  grid-template-columns: minmax(12rem, 1.5fr) minmax(0, 1.15fr) minmax(16rem, 2.4fr);
  gap: 1rem;
  align-items: start;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(216, 228, 222, 0.1);
}

.walk-row--student {
  grid-template-columns: minmax(14rem, 2.2fr) minmax(0, 1.55fr);
}

.walk-row:last-child {
  border-bottom: none;
}

.walk-col {
  min-width: 0;
}

.walk-col--work {
  /* Hard failsafe: Work never paints into Why */
  overflow-x: hidden;
  max-width: 100%;
}

.step-order {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-deep);
  margin-bottom: 0.3rem;
}

.step-work {
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.3;
  color: var(--paper);
  max-width: 100%;
  /* Preserve authored newlines; wrap at column edge instead of bleeding into Why */
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  overflow-x: hidden;
}

.work-chain {
  display: grid;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  grid-template-columns: minmax(0, auto) auto minmax(0, 1fr);
  column-gap: 0.5rem;
  row-gap: 0.2rem;
  align-items: center;
  justify-items: start;
}

/* PR-010: same stroke as .walk-row; width tracks longest Work line (+ a little) */
.work-sections {
  display: inline-block;
  width: max-content;
  max-width: 100%;
  box-sizing: border-box;
  padding-inline-end: 0.75ch;
  vertical-align: top;
}

.work-sections .work-chain {
  width: max-content;
  max-width: 100%;
}

.work-section-break {
  display: block;
  width: 100%;
  max-width: none;
  margin: 0.55rem 0;
  border: 0;
  border-top: 1px solid rgba(216, 228, 222, 0.1);
  opacity: 1;
}

.work-chain-open {
  grid-column: 1 / -1;
  justify-self: start;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.work-chain-lhs {
  justify-self: end;
  text-align: right;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.work-chain-rhs {
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.work-chain .work-op {
  justify-self: center;
}

.work-annot {
  display: grid;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  column-gap: 0.85rem;
  row-gap: 0.2rem;
  align-items: baseline;
  justify-items: start;
}

.work-annot-open {
  grid-column: 1 / -1;
  justify-self: start;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.work-annot-main,
.work-annot-aside {
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.work-annot-aside {
  opacity: 0.92;
}

.work-eq {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  max-width: 100%;
}

.work-pair {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.work-pair-sep {
  color: var(--paper-deep);
  font-weight: 400;
  opacity: 0.55;
  user-select: none;
}

.work-pair-aside {
  opacity: 0.92;
}

.work-side {
  display: inline-flex;
  align-items: center;
  gap: 0.12em;
  flex-wrap: wrap;
}

/* One flex child for `.work-eq` — keeps "y − y₁" from flex-gapping apart */
.work-inline {
  display: inline;
}

/* PR-005 — pedagogical cue circle (`__span__` in Work) */
.work-cue {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.35em;
  min-height: 1.35em;
  padding: 0.06em 0.22em;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  line-height: 1;
  vertical-align: middle;
  box-sizing: border-box;
}

/* PR-008 — Correct / Incorrect example verdicts */
.work-verdict {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: 0.35rem;
  border-left: 3px solid currentColor;
  max-width: 100%;
  box-sizing: border-box;
}

.work-verdict-label {
  font-weight: 650;
  letter-spacing: 0.01em;
  margin-bottom: 0.35rem;
}

.work-verdict-body {
  line-height: 1.45;
}

.work-verdict--ok {
  color: #8fdbb0;
  background: rgba(46, 140, 90, 0.16);
  border-left-color: #5fbf88;
}

.work-verdict--bad {
  color: #f0a0a0;
  background: rgba(160, 55, 55, 0.18);
  border-left-color: #d07070;
}

/* PR-009 — Relation / Function classify marks */
.work-classify {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
}

.work-classify-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25em;
  font-weight: 700;
  line-height: 1;
}

.work-classify--ok {
  color: #8fdbb0;
}

.work-classify--bad {
  color: #f0a0a0;
}

.work-ident {
  display: inline;
  white-space: nowrap;
}

.work-ident sub {
  font-size: 0.55em;
  font-family: var(--font-body);
  vertical-align: baseline;
  position: relative;
  bottom: -0.55em;
  margin-left: 0.12em;
}

.work-dot {
  margin: 0 0.15em;
  line-height: 1;
}

.work-op {
  font-size: 1.15rem;
  line-height: 1;
}

.work-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  line-height: 1.15;
}

.work-num {
  padding: 0 0.4em 0.12em;
  border-bottom: 1.5px solid currentColor;
}

.work-den {
  padding: 0.12em 0.4em 0;
}

/* Squared / powered stacked fractions keep ( … ) so the exponent binds to the whole. */
.work-pow {
  display: inline-flex;
  align-items: center;
  vertical-align: middle;
}

.work-pow > .work-exp {
  font-size: 0.7em;
  line-height: 1;
  align-self: flex-start;
  margin-top: 0.05em;
  margin-left: 0.04em;
}

.work-ident > .work-exp {
  font-size: 0.7em;
  line-height: 1;
  margin-left: 0.02em;
}

.work-ident > .work-exp .work-exp-slash {
  display: inline-block;
  padding: 0 0.22em;
  font-weight: 400;
}

.work-sqrt {
  display: inline-flex;
  align-items: stretch;
  vertical-align: -0.12em;
  margin: 0 0.04em;
}

.work-sqrt-sym {
  font-size: 1.05em;
  line-height: 1;
  display: flex;
  align-items: center;
  padding-right: 0.02em;
}

.work-sqrt-rad {
  border-top: 1.25px solid currentColor;
  padding: 0.02em 0.14em 0 0.06em;
  margin-top: 0.1em;
  line-height: 1.15;
  font-size: inherit;
}

.step-work sub {
  font-size: 0.55em;
  font-family: var(--font-body);
  vertical-align: baseline;
  position: relative;
  bottom: -0.55em;
  margin-left: 0.12em;
}

.step-why {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--fog);
}

.why-info {
  position: relative;
  display: inline;
  margin-left: 0.2em;
  white-space: nowrap;
}

.why-info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.05em;
  height: 1.05em;
  padding: 0;
  margin: 0;
  border: 1px solid rgba(216, 228, 222, 0.45);
  border-radius: 50%;
  background: rgba(216, 228, 222, 0.08);
  color: rgba(216, 228, 222, 0.85);
  font: 600 0.72em/1 var(--font-body);
  vertical-align: 0.08em;
  cursor: help;
}

.why-info-btn:hover,
.why-info-btn:focus-visible {
  border-color: rgba(160, 200, 175, 0.85);
  color: var(--paper);
  background: rgba(160, 200, 175, 0.18);
}

.why-info-btn:focus-visible {
  outline: 2px solid rgba(140, 190, 160, 0.7);
  outline-offset: 2px;
}

.why-info-pop {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.4rem);
  transform: translateX(-50%);
  z-index: 20;
  width: max-content;
  max-width: 16rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid rgba(216, 228, 222, 0.28);
  border-radius: 6px;
  background: #141a17;
  color: var(--paper);
  font-size: 0.82rem;
  font-weight: 400;
  line-height: 1.35;
  white-space: normal;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.12s ease,
    visibility 0.12s ease;
}

.why-info:hover .why-info-pop,
.why-info:focus-within .why-info-pop {
  opacity: 1;
  visibility: visible;
}

.walk-empty {
  margin: 0;
}

.walk-col--review .step-review-comment {
  width: 100%;
  box-sizing: border-box;
  min-height: 4.5rem;
  field-sizing: content;
  resize: none;
  overflow: hidden;
  background: rgba(8, 12, 10, 0.35);
  border: 1px solid rgba(216, 228, 222, 0.2);
  border-radius: 6px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.4;
  padding: 0.5rem 0.6rem;
}

.walk-col--review .step-review-comment::placeholder {
  color: var(--paper-deep);
  opacity: 0.75;
}

.walk-col--review .step-review-comment:focus {
  outline: none;
  border-color: rgba(196, 122, 44, 0.55);
}

.walk-review-submit[hidden] {
  display: none !important;
}

.refs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.ref {
  appearance: none;
  position: relative;
  border: none;
  background: rgba(216, 228, 222, 0.08);
  color: var(--accent-soft);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
}

.ref:hover,
.ref:focus-visible {
  background: rgba(196, 122, 44, 0.22);
}

.ref:focus-visible {
  outline: 2px solid rgba(140, 190, 160, 0.7);
  outline-offset: 2px;
}

.ref-kind {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--paper-deep);
  margin-bottom: 0.1rem;
}

.ref-pop {
  position: absolute;
  left: 0;
  bottom: calc(100% + 0.4rem);
  z-index: 30;
  width: max-content;
  max-width: 16rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid rgba(216, 228, 222, 0.28);
  border-radius: 6px;
  background: #141a17;
  color: var(--paper);
  font-size: 0.82rem;
  font-weight: 400;
  line-height: 1.35;
  white-space: normal;
  text-transform: none;
  letter-spacing: normal;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.12s ease,
    visibility 0.12s ease;
}

.ref--tip:hover .ref-pop,
.ref--tip:focus-visible .ref-pop {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 900px) {
  .walk-head,
  .walk-row,
  .prompt-review {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .walk-head span:nth-child(2) {
    display: none;
  }

  .walk-col--why::before,
  .walk-col--review::before {
    display: block;
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--paper-deep);
    margin-bottom: 0.25rem;
  }

  .walk-col--why::before {
    content: 'Why';
  }

  .walk-col--review::before {
    content: 'Critique';
  }
}

.map-list,
.practice-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.map-list {
  gap: 1rem;
}

.practice-list {
  gap: 0;
}

.map-item,
.practice-item {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(216, 228, 222, 0.12);
}

.map-item:last-child,
.practice-item:last-child {
  border-bottom: none;
}

.practice-return {
  margin: 0 0 1.25rem;
}

.practice-return-btn {
  appearance: none;
  border: 1px solid rgba(196, 122, 44, 0.55);
  background: rgba(196, 122, 44, 0.12);
  color: var(--accent-soft);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.65rem 1rem;
  cursor: pointer;
  border-radius: var(--radius);
  width: 100%;
  text-align: left;
  transition:
    background 0.15s ease,
    border-color 0.15s ease;
}

.practice-return-btn:hover {
  background: rgba(196, 122, 44, 0.22);
  border-color: var(--accent);
}

.practice-here {
  margin: 0 0 1.25rem;
}

.practice-item-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.35rem;
}

.practice-lane {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.practice-lane--easier {
  color: #8fb9a3;
}

.practice-lane--coeff_only {
  color: #b8c9a8;
}

.practice-lane--full_axb {
  color: var(--accent-soft);
}

.practice-lane--distribute_first {
  color: #d4a574;
}

.practice-lane--variables_both_sides {
  color: #c9b896;
}

.practice-active-mark {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--accent-soft);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius);
}

.practice-item--active {
  padding-left: 0.75rem;
  margin-left: -0.75rem;
  border-left: 2px solid var(--accent);
  background: linear-gradient(90deg, rgba(196, 122, 44, 0.1), transparent 70%);
}

.practice-item--active .practice-title {
  color: var(--accent-soft);
}

.map-title,
.practice-title {
  appearance: none;
  border: none;
  background: none;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1.25rem;
  padding: 0;
  cursor: pointer;
  text-align: left;
}

.map-title:hover,
.practice-title:hover {
  color: var(--accent-soft);
}

.map-meta,
.practice-meta {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  color: var(--paper-deep);
}

.prereq-row {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--fog);
}

.prereq-row button {
  appearance: none;
  border: none;
  background: none;
  color: var(--accent-soft);
  font: inherit;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.muted {
  color: var(--paper-deep);
  font-size: 0.85rem;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(28rem, 100%);
  height: 100%;
  z-index: 20;
  background: var(--ink-soft);
  box-shadow: var(--shadow);
  overflow: auto;
  animation: slide-in 0.28s ease-out;
}

.drawer[hidden] {
  display: none;
}

.drawer-inner {
  padding: 1.25rem 1.5rem 2.5rem;
}

.drawer-close {
  appearance: none;
  border: 1px solid rgba(216, 228, 222, 0.25);
  background: transparent;
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.4rem 0.75rem;
  margin-bottom: 1.25rem;
  cursor: pointer;
}

.drawer h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--paper);
}

.drawer .kind-tag {
  margin: 0.35rem 0 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.drawer section {
  margin-top: 1.25rem;
}

.drawer h3 {
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-deep);
}

.drawer p,
.drawer .body {
  margin: 0;
  white-space: pre-wrap;
  color: var(--fog);
}

.drawer ul {
  margin: 0;
  padding-left: 1.1rem;
}

.drawer li {
  margin: 0.25rem 0;
}

.drawer li button {
  appearance: none;
  border: none;
  background: none;
  color: var(--accent-soft);
  font: inherit;
  cursor: pointer;
  padding: 0;
  text-align: left;
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 15;
  background: rgba(8, 12, 11, 0.55);
  animation: fade 0.25s ease-out;
}

.scrim[hidden] {
  display: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slide-in {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero,
  .stage,
  .workspace-chrome,
  .panel,
  .drawer,
  .scrim,
  .customize-panel,
  .shell-page {
    animation: none !important;
  }
}