.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  color: var(--ink);
  background: var(--paper);
  border-bottom: var(--rule-width) solid var(--rule);
}

.site-nav {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  width: 2.55rem;
  height: 2.55rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-4), 3vw, var(--space-8));
  padding: 0;
  margin: 0;
  list-style: none;
  font-size: 0.86rem;
  font-weight: 700;
}

.nav-links a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.nav-links a[aria-current="location"] {
  box-shadow: inset 0 -2px var(--vermilion);
}

.nav-external::after {
  margin-left: var(--space-2);
  color: var(--vermilion);
  content: "↗";
  transition: transform 180ms var(--ease-out);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-8);
}

.action {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  color: inherit;
  font-size: 0.92rem;
  font-weight: 750;
  text-decoration: none;
}

.action-primary {
  padding-inline: var(--space-5);
  color: var(--paper-bright);
  background: var(--carbon);
}

.action-primary::after {
  color: var(--vermilion-light);
  content: "↘";
}

.action-secondary {
  border-bottom: 2px solid currentColor;
}

.action-secondary::after {
  color: var(--vermilion);
  content: "↗";
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(7rem, 2fr) minmax(0, 10fr);
  gap: var(--space-8);
  align-items: start;
  margin-bottom: clamp(var(--space-16), 7vw, var(--space-32));
}

.section-index {
  color: var(--vermilion);
  font-size: var(--step--1);
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-transform: uppercase;
}

.section-heading h2 {
  max-width: 13ch;
  margin-bottom: 0;
  font-family: var(--font-serif);
  font-size: var(--step-4);
  font-weight: 400;
  letter-spacing: -0.048em;
  line-height: 0.94;
}

.section-heading p {
  max-width: var(--measure);
  margin-top: var(--space-6);
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: var(--step-1);
}

.coordinate-label {
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.evidence-tag {
  width: fit-content;
  min-height: 1.8rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding-inline: var(--space-3);
  color: var(--blueprint);
  border: 1px solid color-mix(in oklch, var(--blueprint) 58%, var(--rule));
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.evidence-tag::before {
  width: 0.42rem;
  height: 0.42rem;
  content: "";
  background: currentColor;
}

.trace-field {
  position: relative;
  min-height: 31rem;
  color: var(--night-text);
  background: var(--carbon);
  border: 1px solid var(--carbon);
  overflow: hidden;
}

.trace-field::before,
.trace-field::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.trace-field::before {
  inset: 1.1rem;
  border: 1px solid var(--night-rule);
}

.trace-field::after {
  top: 1.1rem;
  right: 1.1rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--vermilion-light);
}

.trace-field-header {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  color: var(--night-soft);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.trace-field svg {
  width: 100%;
  height: auto;
  min-height: 20rem;
  padding-inline: var(--space-4);
}

.trace-route {
  fill: none;
  stroke: var(--night-rule);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.trace-route-active {
  fill: none;
  stroke: var(--vermilion-light);
  stroke-width: 3;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  vector-effect: non-scaling-stroke;
}

.js .trace-field[data-visible="true"] .trace-route-active {
  animation: trace-draw 1.2s var(--ease-out) forwards;
}

@keyframes trace-draw {
  to {
    stroke-dashoffset: 0;
  }
}

[data-trace-node] {
  transition: opacity 180ms var(--ease-standard);
}

[data-trace-node].is-muted {
  opacity: 0.18;
}

[data-trace-node] .node-core {
  fill: var(--carbon);
  stroke: var(--night-soft);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

[data-trace-node].is-active .node-core {
  fill: var(--vermilion-light);
  stroke: var(--vermilion-light);
}

[data-trace-node] text {
  fill: var(--night-soft);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

[data-trace-node].is-active text {
  fill: var(--night-text);
}

.trace-key {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  padding: 0 var(--space-6) var(--space-6);
  margin: 0;
  list-style: none;
}

.trace-key button {
  width: 100%;
  min-height: 3rem;
  padding: var(--space-3) var(--space-2);
  color: var(--night-soft);
  background: transparent;
  border-top: 1px solid var(--night-rule);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-align: left;
  text-transform: uppercase;
  cursor: pointer;
}

.trace-key button:hover,
.trace-key button:focus-visible {
  color: var(--night-text);
  border-color: var(--vermilion-light);
}

.diagram-frame {
  position: relative;
  padding: var(--space-6);
  margin-inline: 0;
  background: var(--paper-bright);
  border: 1px solid var(--rule);
}

.diagram-frame img,
.profile-diagram img {
  width: 100%;
  height: auto;
}

.diagram-frame::before,
.diagram-frame::after {
  position: absolute;
  width: 0.8rem;
  height: 0.8rem;
  content: "";
  pointer-events: none;
}

.diagram-frame::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--vermilion);
  border-left: 2px solid var(--vermilion);
}

.diagram-frame::after {
  right: -1px;
  bottom: -1px;
  border-right: 2px solid var(--blueprint);
  border-bottom: 2px solid var(--blueprint);
}

.diagram-caption {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-4);
  margin-bottom: 0;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  font-size: 0.76rem;
}

.fact-list {
  padding: 0;
  margin: 0;
  list-style: none;
  border-top: 2px solid var(--ink);
}

.fact-list li {
  display: grid;
  grid-template-columns: minmax(6rem, 0.35fr) minmax(0, 1fr);
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--rule);
}

.fact-list strong {
  color: var(--ink-soft);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.artifact-list {
  border-top: 2px solid var(--ink);
}

.artifact-row {
  min-height: 6.75rem;
  display: grid;
  grid-template-columns: minmax(10rem, 3fr) minmax(14rem, 6fr) minmax(8rem, 2fr) 1.5rem;
  gap: var(--space-6);
  align-items: center;
  color: inherit;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transition: color 180ms var(--ease-out), transform 180ms var(--ease-out);
}

.artifact-row strong {
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 450;
  letter-spacing: -0.025em;
}

.artifact-description,
.artifact-kind {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.artifact-arrow {
  color: var(--vermilion);
  font-size: 1.25rem;
  transition: transform 180ms var(--ease-out);
}

.site-footer {
  color: var(--night-text);
  background: var(--carbon);
}

.site-footer .kicker {
  color: var(--night-soft);
}

.footer-inner {
  padding-block: clamp(var(--space-24), 10vw, var(--space-40)) var(--space-8);
}

.footer-title {
  max-width: 14ch;
  margin-bottom: var(--space-12);
  font-family: var(--font-serif);
  font-size: var(--step-4);
  font-weight: 400;
  letter-spacing: -0.048em;
  line-height: 0.96;
}

.contact-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--night-rule);
}

.contact-path {
  min-height: 10rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-6);
  color: inherit;
  border-bottom: 1px solid var(--night-rule);
  text-decoration: none;
}

.contact-path:first-child {
  border-right: 1px solid var(--night-rule);
}

.contact-path span {
  color: var(--night-soft);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.contact-path strong {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 400;
}

.contact-path strong::after {
  color: var(--vermilion-light);
  font-family: var(--font-sans);
  content: "↗";
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: var(--space-6);
  color: var(--night-soft);
  font-size: 0.75rem;
}

@media (hover: hover) {
  .nav-external:hover::after,
  .artifact-row:hover .artifact-arrow {
    transform: translate(0.16rem, -0.16rem);
  }

  .artifact-row:hover {
    color: var(--blueprint);
    transform: translateX(0.35rem);
  }

  .contact-path:hover {
    background: color-mix(in oklch, var(--carbon) 88%, var(--blueprint));
  }
}

@media (max-width: 64rem) {
  .section-heading {
    grid-template-columns: minmax(5rem, 2fr) minmax(0, 10fr);
  }

  .artifact-row {
    grid-template-columns: minmax(9rem, 4fr) minmax(0, 7fr) 1.5rem;
  }

  .artifact-kind {
    display: none;
  }
}

@media (max-width: 48rem) {
  .brand span {
    display: none;
  }

  .nav-links li:nth-child(2) {
    display: none;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .trace-field {
    min-height: 26rem;
  }

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

  .trace-key li:last-child {
    grid-column: 1 / -1;
  }

  .artifact-row {
    grid-template-columns: minmax(0, 1fr) 1.5rem;
    gap: var(--space-2);
    padding-block: var(--space-5);
  }

  .artifact-description {
    grid-column: 1;
  }

  .artifact-arrow {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .contact-paths {
    grid-template-columns: 1fr;
  }

  .contact-path:first-child {
    border-right: 0;
  }

  .footer-meta {
    flex-direction: column;
  }
}

@media (max-width: 25rem) {
  .nav-links {
    gap: var(--space-3);
  }

  .nav-links li:first-child {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .trace-route-active {
    stroke-dashoffset: 0;
  }
}

@media print {
  .site-footer,
  .trace-field {
    color: #111;
    background: #fff;
    border-color: #555;
  }

  .trace-field::before,
  .trace-field::after {
    display: none;
  }
}