body {
  overflow-x: hidden;
}

button {
  background: transparent;
  cursor: pointer;
}

.atlas-mast {
  position: fixed;
  z-index: 40;
  inset: 0 0 auto;
  display: grid;
  min-height: 4.25rem;
  grid-template-columns: minmax(13rem, 1fr) auto minmax(13rem, 1fr) auto auto;
  align-items: stretch;
  border-bottom: 1px solid var(--line-strong);
  background: var(--canvas);
}

.atlas-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0 1.25rem;
  font: 700 0.84rem/1 var(--font-display);
  letter-spacing: -0.03em;
  text-decoration: none;
  text-transform: uppercase;
}

.atlas-logo {
  display: block;
  width: 1.8rem;
  height: 1.8rem;
  flex: 0 0 auto;
  background: var(--accent-strong);
  -webkit-mask: url("../logo/syntax-monument-mark.svg") center / contain no-repeat;
  mask: url("../logo/syntax-monument-mark.svg") center / contain no-repeat;
}

.atlas-brand small {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--muted);
  font: 600 0.55rem var(--font-mono);
  letter-spacing: 0.14em;
}

.atlas-phase,
.view-switch,
.atlas-mast > button {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.atlas-phase {
  display: grid;
  place-items: center;
  color: var(--dim);
}

.view-switch {
  display: flex;
  justify-self: end;
  border-left: 1px solid var(--line);
}

.view-switch a,
.atlas-mast > button {
  display: grid;
  place-items: center;
  padding: 0 0.85rem;
  border-left: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
}

.view-switch a:first-child {
  border-left: 0;
}

.view-switch a[aria-current="page"] {
  background: var(--accent);
  color: var(--ink);
}

.atlas-mast > button {
  border-top: 0;
  border-right: 0;
  border-bottom: 0;
}

.view-switch a:hover,
.atlas-mast > button:hover {
  background: var(--panel-raised);
  color: var(--ink);
}

.phase-edge-index {
  position: fixed;
  z-index: 32;
  inset: 4.25rem auto 0 0;
  display: flex;
  width: 4.25rem;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--canvas);
}

.phase-edge-button {
  display: grid;
  min-height: 3.25rem;
  flex: 1;
  place-items: center;
  color: var(--muted);
  font: 600 0.62rem var(--font-mono);
  border-bottom: 1px solid var(--line);
}

.phase-edge-button span {
  max-height: 7rem;
  overflow: hidden;
  letter-spacing: 0.08em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
  writing-mode: vertical-rl;
}

.phase-edge-button.is-current {
  background: var(--accent);
  color: var(--ink);
}

.phase-edge-button.is-sealed {
  color: var(--quiet-strong);
}

.phase-edge-button:hover {
  background: var(--panel-raised);
  color: var(--ink);
}

.current-readout,
.next-readout,
.route-key,
.survey-elevation,
.nearest-readout {
  position: fixed;
  z-index: 25;
}

.current-readout {
  top: 7rem;
  left: 6rem;
  width: min(18rem, 24vw);
  pointer-events: none;
}

.readout-eyebrow,
.next-readout small,
.next-readout span,
.route-key,
.survey-elevation span,
.nearest-readout {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.readout-eyebrow {
  margin-bottom: 0.8rem;
  color: var(--accent-strong);
}

.current-readout h1 {
  margin: 0;
  font: 700 clamp(2.5rem, 4.2vw, 4.4rem)/0.83 var(--font-display);
  letter-spacing: -0.065em;
  text-transform: uppercase;
}

.current-readout > p {
  max-width: 16rem;
  margin: 1rem 0 0;
  color: var(--dim);
  font-size: 0.9rem;
}

.current-readout dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 1.4rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line-strong);
}

.current-readout dt {
  color: var(--muted);
  font: 600 0.55rem var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.current-readout dd {
  margin: 0.2rem 0 0;
  font: 600 1.15rem var(--font-display);
}

.atlas-complete {
  min-height: 2.75rem;
  width: 100%;
  margin-top: 1rem;
  padding: 0.6rem 0.75rem;
  background: var(--accent);
  color: var(--ink);
  font: 700 0.65rem var(--font-mono);
  letter-spacing: 0.06em;
  text-align: left;
  text-transform: uppercase;
  pointer-events: auto;
}

.atlas-complete:hover {
  background: var(--accent-strong);
  color: var(--ink);
}

.next-readout {
  top: 7.3rem;
  right: 2rem;
  width: min(17rem, 22vw);
  text-align: right;
  pointer-events: none;
}

.next-readout small {
  color: var(--quiet-strong);
}

.next-readout strong {
  display: block;
  margin: 0.6rem 0;
  font: 650 clamp(1.45rem, 2.7vw, 2.8rem)/0.94 var(--font-display);
  letter-spacing: -0.05em;
}

.next-readout span {
  color: var(--muted);
}

.route-key {
  right: 2rem;
  bottom: 2rem;
  color: var(--muted);
  line-height: 1.9;
  pointer-events: none;
}

.route-key div {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.route-key i {
  display: block;
  width: 1.6rem;
  height: 0.2rem;
}

.complete-key { background: var(--accent-strong); }
.open-key { border-top: 0.2rem solid var(--ink); }
.sealed-key { border-top: 0.2rem dashed var(--quiet); }

.survey-elevation {
  bottom: 2rem;
  left: 6rem;
  color: var(--muted);
  pointer-events: none;
}

.survey-elevation strong {
  display: block;
  font: 600 2.4rem/0.9 var(--font-display);
  letter-spacing: -0.06em;
}

.survey-elevation span {
  color: var(--muted);
}

.nearest-readout {
  bottom: 1.5rem;
  left: 50%;
  max-width: 28rem;
  padding: 0.35rem 0.65rem;
  background: var(--canvas);
  color: var(--muted);
  text-align: center;
  transform: translateX(-50%);
  pointer-events: none;
}

.fixed-position-line {
  position: fixed;
  z-index: 22;
  top: 50%;
  left: 4.25rem;
  right: 0;
  height: 1px;
  background: var(--accent-strong);
  pointer-events: none;
}

.fixed-position-line::after {
  position: absolute;
  top: -0.38rem;
  left: 50%;
  width: 0.75rem;
  height: 0.75rem;
  content: "";
  border: 2px solid var(--accent-strong);
  background: var(--canvas);
  clip-path: circle(50%);
  transform: translateX(-50%);
}

.fixed-position-line span {
  position: absolute;
  top: -1.5rem;
  left: 50%;
  padding: 0.2rem 0.5rem;
  background: var(--canvas);
  color: var(--accent-strong);
  font: 700 0.58rem var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transform: translateX(-50%);
}

.atlas-map {
  position: relative;
  width: 100%;
  height: var(--map-height, 5200px);
  overflow: hidden;
  background: var(--canvas);
}

.terrain-svg,
.route-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.terrain-line {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.terrain-line.is-minor {
  opacity: 0.45;
}

.route-complete,
.route-current,
.route-open,
.route-sealed,
.route-branch,
.lesson-route {
  fill: none;
  stroke-linecap: square;
  stroke-linejoin: miter;
  vector-effect: non-scaling-stroke;
}

.route-complete {
  stroke: var(--accent-through);
  stroke-width: 7;
}

.route-current {
  stroke: var(--accent-strong);
  stroke-width: 9;
}

.route-open {
  stroke: var(--ink);
  stroke-width: 3;
}

.route-sealed {
  stroke: var(--quiet);
  stroke-width: 4;
  stroke-dasharray: 9 13;
}

.route-branch {
  stroke: var(--accent-strong);
  stroke-width: 2;
}

.route-branch.is-sealed {
  stroke: var(--quiet);
  stroke-dasharray: 6 10;
}

.lesson-route {
  stroke: var(--accent-strong);
  stroke-width: 2;
  stroke-dasharray: 5 8;
}

.map-phase-title {
  position: absolute;
  left: 6rem;
  color: color-mix(in srgb, var(--ink) 7%, var(--canvas));
  font: 700 clamp(5rem, 10vw, 10rem)/0.75 var(--font-display);
  letter-spacing: -0.08em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.checkpoint {
  position: absolute;
  display: grid;
  width: 18rem;
  min-height: 4.6rem;
  grid-template-columns: 3.5rem 1fr;
  gap: 0.9rem;
  align-items: start;
  color: var(--ink);
  text-align: left;
  transform: translateY(-50%);
}

.checkpoint.is-left {
  grid-template-columns: 1fr 3.5rem;
  text-align: right;
  transform: translate(-100%, -50%);
}

.checkpoint.is-left .checkpoint-marker { grid-column: 2; }
.checkpoint.is-left .checkpoint-copy { grid-row: 1; grid-column: 1; }

.checkpoint-marker {
  display: grid;
  width: 3.5rem;
  height: 3.5rem;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--canvas);
  font: 700 0.68rem var(--font-mono);
  clip-path: circle(50%);
}

.checkpoint-copy small,
.checkpoint-copy strong,
.checkpoint-copy span {
  display: block;
}

.checkpoint-copy small,
.checkpoint-copy span {
  color: var(--muted);
  font: 600 0.58rem var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.checkpoint-copy strong {
  margin: 0.25rem 0;
  font: 650 1.12rem/1 var(--font-display);
  letter-spacing: -0.035em;
}

.checkpoint.is-completed .checkpoint-marker {
  border-color: var(--accent-strong);
  background: var(--accent);
}

.checkpoint.is-current .checkpoint-marker {
  width: 4.3rem;
  height: 4.3rem;
  border: 0.5rem solid var(--accent-strong);
  font-size: 0.75rem;
}

.checkpoint.is-reachable .checkpoint-marker {
  border-color: var(--ink);
}

.checkpoint.is-sealed {
  color: var(--quiet-strong);
}

.checkpoint.is-sealed .checkpoint-marker {
  border-style: dashed;
  border-color: var(--quiet);
}

.checkpoint:hover .checkpoint-copy strong,
.checkpoint:focus-visible .checkpoint-copy strong {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.25rem;
}

.checkpoint.is-nearest .checkpoint-copy small {
  color: var(--accent-strong);
}

.lesson-switchbacks {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.switchback-label {
  position: absolute;
  width: 20rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.82rem;
  text-align: left;
  transform: translateY(-50%);
  pointer-events: auto;
}

.switchback-label b,
.switchback-label span {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.switchback-label b {
  display: inline-block;
  width: 2.8rem;
  color: var(--accent-strong);
}

.switchback-label span {
  float: right;
  color: var(--muted);
}

.switchback-label[aria-current="step"] {
  color: var(--accent-strong);
  font-weight: 700;
}

.course-ledger {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  grid-template-rows: auto 1fr;
  background: var(--canvas);
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

.course-ledger.is-open {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

.course-ledger > header {
  display: flex;
  min-height: 5rem;
  align-items: center;
  justify-content: space-between;
  padding-left: 1.5rem;
  border-bottom: 1px solid var(--line-strong);
}

.course-ledger > header span,
.course-ledger > header button {
  color: var(--muted);
  font: 600 0.65rem var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.course-ledger > header h2 {
  margin: 0.2rem 0 0;
  font: 650 1.8rem/1 var(--font-display);
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.course-ledger > header button {
  align-self: stretch;
  padding: 0 1.5rem;
  border-left: 1px solid var(--line-strong);
}

.course-ledger > ol {
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
  counter-reset: ledger-module;
}

.ledger-module {
  display: grid;
  grid-template-columns: 4rem minmax(13rem, 0.6fr) 1fr auto;
  gap: 1rem;
  align-items: center;
  min-height: 6rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
  counter-increment: ledger-module;
}

.ledger-module::before {
  content: counter(ledger-module, decimal-leading-zero);
  color: var(--accent-strong);
  font: 600 0.7rem var(--font-mono);
}

.ledger-module.is-current {
  background: var(--accent);
}

.ledger-module h3 {
  margin: 0;
  font: 650 clamp(1.4rem, 3vw, 2.8rem)/0.95 var(--font-display);
  letter-spacing: -0.045em;
}

.ledger-lessons {
  display: flex;
  flex-wrap: wrap;
}

.ledger-lesson {
  padding: 0.55rem 0.7rem;
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.78rem;
  text-align: left;
}

.ledger-lesson[aria-current="step"] {
  background: var(--accent);
  color: var(--ink);
}

.ledger-lesson[aria-disabled="true"],
.ledger-meta.is-sealed {
  color: var(--quiet-strong);
}

.ledger-lesson[aria-disabled="true"] {
  cursor: not-allowed;
}

.ledger-meta {
  color: var(--muted);
  font: 600 0.62rem var(--font-mono);
  letter-spacing: 0.08em;
  text-align: right;
  text-transform: uppercase;
}

@media (max-width: 1050px) {
  .atlas-mast { grid-template-columns: minmax(12rem, 1fr) auto auto; }
  .atlas-phase, .view-switch { display: none; }
  .current-readout { width: 14rem; }
  .current-readout h1 { font-size: 2.7rem; }
  .current-readout > p, .current-readout dl { display: none; }
  .next-readout { top: auto; bottom: 4rem; }
  .route-key, .survey-elevation { display: none; }
  .checkpoint { width: 14rem; }
  .switchback-label { width: 16rem; }
  .ledger-module { grid-template-columns: 3rem 1fr auto; }
  .ledger-lessons { grid-column: 2 / 4; }
}

@media (max-width: 700px) {
  .atlas-mast { min-height: 3.5rem; grid-template-columns: 1fr auto; }
  .atlas-brand { padding-inline: 0.75rem; }
  .atlas-logo { width: 1.45rem; height: 1.45rem; }
  #ledger-open { display: none; }
  .atlas-mast > button { padding-inline: 0.7rem; }
  .phase-edge-index { inset-block-start: 3.5rem; width: 2.8rem; }
  .phase-edge-button span { display: none; }
  .fixed-position-line { left: 2.8rem; }
  .current-readout { position: absolute; top: 5.5rem; left: 4rem; width: 13rem; }
  .current-readout h1 { font-size: 2.2rem; }
  .current-readout > p { display: none; }
  .atlas-complete { font-size: 0.58rem; }
  .next-readout { display: none; }
  .nearest-readout { right: 0.5rem; bottom: 0.5rem; left: auto; max-width: 14rem; text-align: right; transform: none; }
  .checkpoint { width: 10.5rem; grid-template-columns: 2.8rem 1fr; gap: 0.55rem; }
  .checkpoint.is-left { grid-template-columns: 1fr 2.8rem; }
  .checkpoint-marker { width: 2.8rem; height: 2.8rem; }
  .checkpoint.is-current .checkpoint-marker { width: 3.3rem; height: 3.3rem; border-width: 0.4rem; }
  .checkpoint-copy small, .checkpoint-copy span { font-size: 0.5rem; }
  .checkpoint-copy strong { font-size: 0.85rem; }
  .switchback-label { width: 11rem; font-size: 0.7rem; }
  .map-phase-title { left: 3.2rem; font-size: 4.5rem; }
  .course-ledger > header { padding-left: 1rem; }
  .ledger-module { grid-template-columns: 2rem 1fr; padding: 1rem; }
  .ledger-lessons, .ledger-meta { grid-column: 2; }
  .ledger-meta { text-align: left; }
}