:root {
  color-scheme: dark;
  --ink: #d9f7ec;
  --ink-strong: #f2fff9;
  --muted: #83a99c;
  --faint: #44675d;
  --surface: #071011;
  --surface-raised: #0b1717;
  --panel: rgba(9, 24, 22, 0.92);
  --line: rgba(126, 230, 194, 0.18);
  --line-strong: rgba(126, 230, 194, 0.4);
  --mint: #7ee6c2;
  --mint-bright: #b4ffe5;
  --cyan: #65d7ec;
  --amber: #ffc66d;
  --rose: #ff8e9d;
  --violet: #a99dff;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  background: var(--surface);
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 78% -8%, rgba(70, 182, 149, 0.1), transparent 30rem),
    var(--surface);
  font-family: var(--font-sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

::selection {
  color: #04100c;
  background: var(--mint);
}

:focus-visible {
  outline: 2px solid var(--mint-bright);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: #03110c;
  background: var(--mint-bright);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 20;
  display: flex;
  width: min(100% - 3rem, 1440px);
  min-height: 5.5rem;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 2.4rem;
  height: 2.4rem;
  place-items: center;
  border: 1px solid var(--line-strong);
  background: rgba(126, 230, 194, 0.04);
}

.brand-mark::before,
.brand-mark::after,
.brand-mark span {
  position: absolute;
  display: block;
  content: "";
  background: var(--mint);
}

.brand-mark::before {
  width: 1.2rem;
  height: 1px;
}

.brand-mark::after {
  width: 1px;
  height: 1.2rem;
}

.brand-mark span:nth-child(1) {
  width: 0.3rem;
  height: 0.3rem;
  transform: translate(-0.55rem, -0.55rem);
}

.brand-mark span:nth-child(2) {
  width: 0.3rem;
  height: 0.3rem;
  transform: translate(0.55rem, 0.55rem);
}

.brand-mark span:nth-child(3) {
  width: 0.22rem;
  height: 0.22rem;
  border-radius: 50%;
  box-shadow: 0 0 0.7rem var(--mint);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  color: var(--ink-strong);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  line-height: 1.3;
  text-transform: uppercase;
}

.brand small {
  margin-top: 0.1rem;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 0.59rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.site-header nav a,
.header-tour {
  color: var(--muted);
  background: none;
  border: 0;
  cursor: pointer;
  text-decoration: none;
  transition: color 160ms ease;
}

.site-header nav a:hover,
.header-tour:hover {
  color: var(--mint-bright);
}

.header-tour {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0;
}

.status-dot {
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0.65rem var(--mint);
  animation: status-pulse 2.4s ease-in-out infinite;
}

.portfolio-link {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--line-strong);
}

main {
  width: min(100% - 3rem, 1440px);
  margin: 0 auto;
}

.hero {
  display: grid;
  min-height: min(47rem, calc(100svh - 5.5rem));
  padding: clamp(5rem, 10vw, 9rem) 0 6rem;
  grid-template-columns: minmax(0, 1.5fr) minmax(20rem, 0.65fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 9rem);
}

.eyebrow {
  margin: 0 0 1.3rem;
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.eyebrow span {
  margin-right: 1.1rem;
  color: var(--amber);
}

h1,
h2,
h3,
h4,
h5,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--ink-strong);
  font-weight: 520;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 13ch;
  margin-bottom: 1.8rem;
  font-size: clamp(3.4rem, 8vw, 8.6rem);
  line-height: 0.86;
}

h1 em {
  color: var(--mint-bright);
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.06em;
  text-shadow: 0 0 2.5rem rgba(126, 230, 194, 0.16);
}

.lede {
  max-width: 42rem;
  margin-bottom: 2.3rem;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.3rem);
}

.hero-actions,
.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  padding: 0.75rem 1.05rem;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  background: rgba(126, 230, 194, 0.025);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease, transform 160ms ease;
}

.button:hover {
  border-color: var(--mint);
  color: var(--mint-bright);
  transform: translateY(-2px);
}

.button-primary {
  border-color: var(--mint);
  color: #03110c;
  background: var(--mint);
}

.button-primary:hover {
  color: #03110c;
  background: var(--mint-bright);
}

.hero-spec {
  position: relative;
  padding: 1.2rem;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(var(--line) 1px, transparent 1px),
    rgba(7, 18, 17, 0.65);
  background-size: 2rem 2rem;
  box-shadow: 1.1rem 1.1rem 0 rgba(126, 230, 194, 0.025);
}

.hero-spec::before,
.hero-spec::after {
  position: absolute;
  width: 0.5rem;
  height: 0.5rem;
  border-color: var(--mint);
  content: "";
}

.hero-spec::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid;
  border-left: 2px solid;
}

.hero-spec::after {
  right: -1px;
  bottom: -1px;
  border-right: 2px solid;
  border-bottom: 2px solid;
}

.spec-heading,
.frame-footer,
.frame-coordinates {
  display: flex;
  justify-content: space-between;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.13em;
}

.hero-spec dl {
  margin: 2.6rem 0 2rem;
}

.hero-spec dl div {
  display: flex;
  padding: 0.72rem 0;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px dotted var(--line-strong);
}

.hero-spec dt {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero-spec dd {
  margin: 0;
  color: var(--mint-bright);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.hero-spec > p {
  margin: 0;
  color: var(--faint);
  font-size: 0.73rem;
}

.map-section,
.architecture,
.principles,
.closing {
  padding: clamp(5.5rem, 10vw, 9rem) 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  margin-bottom: 2.8rem;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
}

.section-heading .eyebrow {
  margin-bottom: 0.7rem;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2.2rem, 5vw, 4.7rem);
  line-height: 1;
}

.section-intro {
  max-width: 31rem;
  margin-bottom: 0;
  color: var(--muted);
}

.map-legend {
  display: flex;
  gap: 1.4rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.map-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.legend-line {
  width: 1.6rem;
  height: 1px;
  background: var(--mint);
}

.legend-node {
  width: 0.6rem;
  height: 0.6rem;
  border: 1px solid var(--mint);
  background: rgba(126, 230, 194, 0.12);
}

.blueprint-frame {
  position: relative;
  padding: 1.1rem;
  border: 1px solid var(--line-strong);
  background: #071211;
}

.frame-coordinates {
  margin-bottom: 0.7rem;
}

.spatial-map {
  position: relative;
  min-height: clamp(35rem, 49vw, 48rem);
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(126, 230, 194, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 230, 194, 0.075) 1px, transparent 1px),
    linear-gradient(rgba(126, 230, 194, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 230, 194, 0.025) 1px, transparent 1px),
    radial-gradient(circle at center, rgba(27, 82, 65, 0.13), transparent 55%);
  background-size: 8% 10%, 10% 8%, 2% 2.5%, 2.5% 2%;
}

.spatial-map::before,
.spatial-map::after {
  position: absolute;
  z-index: 0;
  content: "";
  pointer-events: none;
}

.spatial-map::before {
  inset: 3.5% 2.5%;
  border: 1px dashed rgba(126, 230, 194, 0.09);
}

.spatial-map::after {
  top: 50%;
  left: 50%;
  width: 4rem;
  height: 4rem;
  border: 1px solid rgba(126, 230, 194, 0.08);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.connection-map {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.connection-map path {
  fill: none;
  stroke: rgba(126, 230, 194, 0.25);
  stroke-width: 1.35;
  vector-effect: non-scaling-stroke;
  marker-end: url(#arrow);
  transition: stroke 200ms ease, filter 200ms ease;
}

.connection-map marker path {
  fill: var(--mint);
  stroke: none;
}

.connection-map path.flow-active {
  stroke: var(--mint-bright);
  stroke-width: 2;
  stroke-dasharray: 8 9;
  filter: drop-shadow(0 0 0.35rem var(--mint));
  animation: flow-dash 0.65s linear infinite;
}

.map-region-label {
  position: absolute;
  z-index: 2;
  color: rgba(126, 230, 194, 0.28);
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.15em;
  pointer-events: none;
}

.region-label-edge { top: 35%; left: 4%; }
.region-label-experience { top: 6%; left: 55%; }
.region-label-content { top: 38%; left: 55%; }
.region-label-service { top: 38%; left: 76%; }
.region-label-delivery { top: 69%; left: 54%; }

.system-node {
  position: absolute;
  z-index: 3;
  top: var(--node-y);
  left: var(--node-x);
  display: flex;
  width: clamp(7.4rem, 11.5vw, 10.4rem);
  min-height: 4.2rem;
  padding: 0.7rem 0.75rem;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--node-color, var(--mint));
  color: var(--ink);
  background: rgba(7, 20, 18, 0.96);
  box-shadow: 0 0 0 0 rgba(126, 230, 194, 0);
  text-decoration: none;
  transform: translate(-50%, -50%);
  transition: color 180ms ease, background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.system-node::before,
.system-node::after {
  position: absolute;
  width: 0.38rem;
  height: 0.38rem;
  border-color: var(--node-color, var(--mint));
  content: "";
}

.system-node::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid;
  border-left: 2px solid;
}

.system-node::after {
  right: -1px;
  bottom: -1px;
  border-right: 2px solid;
  border-bottom: 2px solid;
}

.system-node:hover,
.system-node.node-active {
  color: var(--ink-strong);
  background: color-mix(in srgb, var(--node-color, var(--mint)) 10%, #071412);
  box-shadow: 0 0 1.6rem color-mix(in srgb, var(--node-color, var(--mint)) 22%, transparent);
  transform: translate(-50%, -50%) scale(1.045);
}

.system-node.node-tour-active {
  z-index: 5;
  box-shadow: 0 0 0 4px rgba(7, 16, 17, 0.85), 0 0 0 6px var(--node-color, var(--mint)), 0 0 2rem var(--node-color, var(--mint));
}

.node-experience { --node-color: var(--cyan); }
.node-edge { --node-color: var(--mint); }
.node-content { --node-color: var(--amber); }
.node-service { --node-color: var(--rose); }
.node-delivery { --node-color: var(--violet); }

.node-code {
  color: color-mix(in srgb, var(--node-color) 70%, var(--muted));
  font-family: var(--font-mono);
  font-size: 0.52rem;
  letter-spacing: 0.1em;
}

.system-node strong {
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: clamp(0.58rem, 0.75vw, 0.7rem);
  font-weight: 500;
  line-height: 1.35;
  text-overflow: ellipsis;
  text-transform: uppercase;
}

.node-port {
  position: absolute;
  right: -0.28rem;
  top: 50%;
  width: 0.48rem;
  height: 0.48rem;
  border: 1px solid var(--node-color);
  background: #071211;
  transform: translateY(-50%) rotate(45deg);
}

.frame-footer {
  margin-top: 0.75rem;
}

.mobile-flow {
  display: none;
}

.region-index {
  border-top: 1px solid var(--line-strong);
}

.region {
  display: grid;
  padding: 2.8rem 0;
  border-bottom: 1px solid var(--line);
  grid-template-columns: minmax(15rem, 0.72fr) minmax(0, 1.6fr);
  gap: clamp(2rem, 7vw, 7rem);
  scroll-margin-top: 6rem;
}

.region > header {
  display: grid;
  align-content: start;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
}

.region > header > span {
  color: var(--region-color, var(--mint));
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.region h3 {
  margin-bottom: 0.65rem;
  font-size: clamp(1.35rem, 2vw, 1.85rem);
}

.region header p {
  max-width: 28rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.region-experience { --region-color: var(--cyan); }
.region-edge { --region-color: var(--mint); }
.region-content { --region-color: var(--amber); }
.region-service { --region-color: var(--rose); }
.region-delivery { --region-color: var(--violet); }

.region-systems {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.system-detail {
  display: flex;
  min-width: 0;
  min-height: 22rem;
  padding: clamp(1.2rem, 2.5vw, 2rem);
  flex-direction: column;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(126, 230, 194, 0.035), transparent 60%);
  scroll-margin-top: 7rem;
  transition: border-color 180ms ease, background 180ms ease;
}

.system-detail:target {
  border-color: var(--region-color);
  background: color-mix(in srgb, var(--region-color) 7%, transparent);
}

.detail-title span {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--region-color);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
}

.detail-title h4 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.detail-summary {
  color: var(--muted);
  font-size: 0.85rem;
}

.detail-columns {
  display: grid;
  margin-top: auto;
  padding-top: 1.4rem;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.2rem;
}

.detail-columns h5 {
  margin: 0 0 0.55rem;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.detail-columns ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-columns li {
  position: relative;
  margin: 0.38rem 0;
  padding-left: 0.75rem;
  color: var(--ink);
  font-size: 0.72rem;
}

.detail-columns li::before {
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 0.25rem;
  height: 1px;
  background: var(--region-color);
  content: "";
}

.evidence-list li {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.62rem;
}

.detail-link {
  display: inline-block;
  margin-top: 1.2rem;
  color: var(--region-color);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

.detail-link:hover {
  text-decoration: underline;
}

.principles {
  display: grid;
  grid-template-columns: minmax(16rem, 0.85fr) minmax(0, 1.4fr);
  gap: clamp(3rem, 9vw, 10rem);
}

.principles h2 {
  max-width: 8ch;
}

.principles ol {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.principles li {
  display: grid;
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 2.5rem 1fr minmax(12rem, 1fr);
  align-items: baseline;
  gap: 1rem;
}

.principles li > span {
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 0.62rem;
}

.principles li strong {
  color: var(--ink-strong);
  font-size: 0.88rem;
}

.principles li p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.closing {
  text-align: center;
}

.closing h2 {
  margin-bottom: 1.2rem;
}

.closing > p:not(.eyebrow) {
  max-width: 40rem;
  margin: 0 auto 2rem;
  color: var(--muted);
}

.closing .hero-actions {
  justify-content: center;
}

.site-footer {
  display: flex;
  width: min(100% - 3rem, 1440px);
  min-height: 5rem;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.system-dialog {
  width: min(42rem, calc(100% - 2rem));
  max-height: min(45rem, calc(100dvh - 2rem));
  padding: 0;
  overflow: auto;
  border: 1px solid var(--mint);
  color: var(--ink);
  background: #091615;
  box-shadow: 0 1.5rem 6rem rgba(0, 0, 0, 0.72), 0 0 2rem rgba(126, 230, 194, 0.13);
}

.system-dialog::backdrop {
  background: rgba(2, 7, 7, 0.82);
  backdrop-filter: blur(4px);
}

.system-dialog form {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  justify-content: end;
  pointer-events: none;
}

.dialog-close {
  width: 2.8rem;
  height: 2.8rem;
  border: 0;
  border-left: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  color: var(--mint-bright);
  background: #091615;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  cursor: pointer;
  pointer-events: auto;
}

#dialog-content .system-detail {
  min-height: auto;
  padding: clamp(1.4rem, 5vw, 3rem);
  border: 0;
  background: none;
}

#dialog-content .detail-summary {
  font-size: 0.95rem;
}

#dialog-content .detail-columns {
  margin-top: 1rem;
}

.tour-panel {
  position: fixed;
  z-index: 50;
  right: 1.5rem;
  bottom: 1.5rem;
  display: grid;
  width: min(41rem, calc(100% - 3rem));
  padding: 1.25rem;
  border: 1px solid var(--mint);
  background: rgba(5, 18, 16, 0.96);
  box-shadow: 0 1.5rem 5rem rgba(0, 0, 0, 0.65), 0 0 1.5rem rgba(126, 230, 194, 0.12);
  backdrop-filter: blur(12px);
  grid-template-columns: 1fr auto;
  gap: 1rem 1.5rem;
}

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

.tour-progress {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.3rem;
}

.tour-progress span {
  height: 2px;
  background: var(--line-strong);
}

.tour-progress span.complete,
.tour-progress span.current {
  background: var(--mint);
  box-shadow: 0 0 0.4rem rgba(126, 230, 194, 0.5);
}

.tour-copy .eyebrow {
  margin-bottom: 0.45rem;
}

.tour-copy h2 {
  margin-bottom: 0.55rem;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
}

.tour-copy > p:last-child {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.tour-controls {
  display: grid;
  grid-template-columns: auto auto;
  align-content: end;
  gap: 0.5rem;
}

.tour-controls button {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  cursor: pointer;
}

.tour-controls .tour-next {
  border-color: var(--mint);
  color: #03110c;
  background: var(--mint);
}

.tour-controls .tour-exit {
  grid-column: 1 / -1;
  border: 0;
  color: var(--faint);
}

.tour-controls button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.noscript-note {
  position: fixed;
  z-index: 60;
  right: 1rem;
  bottom: 1rem;
  max-width: 26rem;
  margin: 0;
  padding: 0.8rem 1rem;
  border: 1px solid var(--amber);
  color: var(--ink);
  background: #17150e;
  font-size: 0.75rem;
}

.error-page {
  display: flex;
  min-height: 100svh;
  padding: 2rem;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.error-page h1 {
  max-width: 12ch;
  font-size: clamp(2.5rem, 8vw, 6rem);
  line-height: 0.95;
}

.error-page > p:not(.eyebrow) {
  margin-bottom: 2rem;
  color: var(--muted);
}

@keyframes status-pulse {
  0%, 100% { opacity: 0.55; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.1); }
}

@keyframes flow-dash {
  to { stroke-dashoffset: -17; }
}

@media (max-width: 1050px) {
  .hero {
    grid-template-columns: 1fr minmax(17rem, 0.55fr);
    gap: 3rem;
  }

  .system-node {
    width: 7.5rem;
  }

  .region {
    grid-template-columns: 1fr;
  }

  .region > header {
    max-width: 38rem;
  }
}

@media (max-width: 780px) {
  .site-header,
  main,
  .site-footer {
    width: min(100% - 2rem, 1440px);
  }

  .site-header {
    min-height: 4.6rem;
  }

  .site-header nav {
    gap: 0.8rem;
  }

  .site-header nav > a:not(.portfolio-link),
  .header-tour {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 5.5rem 0 4.5rem;
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(3.25rem, 15vw, 6rem);
  }

  .hero-spec {
    max-width: 32rem;
  }

  .section-heading {
    display: block;
  }

  .section-intro,
  .map-legend {
    margin-top: 1.2rem;
  }

  .blueprint-frame {
    padding: 0.75rem;
  }

  .spatial-map,
  .frame-coordinates {
    display: none;
  }

  .mobile-flow {
    display: block;
    padding: 0.4rem;
  }

  .mobile-flow-label {
    color: var(--faint);
    font-family: var(--font-mono);
    font-size: 0.56rem;
    letter-spacing: 0.13em;
    text-transform: uppercase;
  }

  .mobile-flow ol {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .mobile-flow li {
    position: relative;
  }

  .mobile-flow li:not(:last-child)::after {
    position: absolute;
    bottom: -0.8rem;
    left: 1.15rem;
    width: 1px;
    height: 1.6rem;
    background: var(--mint);
    content: "";
  }

  .mobile-flow a {
    display: grid;
    margin: 0.8rem 0;
    padding: 1rem;
    border: 1px solid var(--line-strong);
    background: rgba(126, 230, 194, 0.025);
    grid-template-columns: 2.4rem 1fr auto;
    gap: 0.65rem;
    text-decoration: none;
  }

  .mobile-flow a > span,
  .mobile-flow a small {
    color: var(--mint);
    font-family: var(--font-mono);
    font-size: 0.56rem;
  }

  .mobile-flow a strong {
    display: block;
    margin: 0.2rem 0 0.35rem;
    color: var(--ink-strong);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
  }

  .mobile-flow a p {
    margin: 0;
    color: var(--muted);
    font-size: 0.75rem;
  }

  .mobile-flow a i {
    color: var(--mint);
    font-style: normal;
  }

  .region-systems {
    grid-template-columns: 1fr;
  }

  .system-detail {
    min-height: auto;
  }

  .detail-columns {
    margin-top: 1rem;
  }

  .principles {
    grid-template-columns: 1fr;
  }

  .principles h2 {
    max-width: 12ch;
  }

  .principles li {
    grid-template-columns: 2rem 1fr;
  }

  .principles li p {
    grid-column: 2;
  }

  .site-footer span:nth-child(2) {
    display: none;
  }

  .tour-panel {
    right: 0.75rem;
    bottom: 0.75rem;
    width: calc(100% - 1.5rem);
    max-height: calc(100dvh - 1.5rem);
    overflow: auto;
    grid-template-columns: 1fr;
  }

  .tour-controls {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .brand-mark {
    width: 2rem;
    height: 2rem;
  }

  .brand strong {
    font-size: 0.7rem;
  }

  .brand small {
    font-size: 0.5rem;
  }

  .portfolio-link {
    padding: 0.45rem 0.55rem;
    font-size: 0.58rem;
  }

  .hero-actions .button {
    width: 100%;
  }

  .map-legend {
    display: grid;
    gap: 0.55rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (forced-colors: active) {
  .button,
  .system-node,
  .hero-spec,
  .blueprint-frame,
  .system-detail,
  .system-dialog,
  .tour-panel {
    border: 1px solid CanvasText;
  }

  h1 em {
    color: CanvasText;
    -webkit-text-stroke: 0;
  }
}