:root {
  color-scheme: dark;
  --bg: #101412;
  --bg-raised: #1a221e;
  --bg-inset: #0c100e;
  --line: #31403a;
  --ink: #f4f7f5;
  --muted: #c5d0ca;
  --amber: #e0b15a;
  --amber-ink: #1c1408;
  --teal: #8fd0c6;
  --complete: #9ed4b0;
  --progress: #e0b15a;
  --idle: #c5d0ca;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
  --space: 1.25rem;
  --font: "Segoe UI", "Noto Sans", "Liberation Sans", sans-serif;
  --mono: "Noto Sans Mono", "Liberation Mono", ui-monospace, monospace;
}

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

html {
  font-size: 112.5%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.5;
}

a {
  color: var(--teal);
}

a:hover {
  color: var(--ink);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: var(--space);
  top: 0;
  transform: translateY(-120%);
  background: var(--amber);
  color: var(--amber-ink);
  padding: 0.6rem 1rem;
  z-index: 2;
}

.skip-link:focus {
  transform: none;
}

.site-header,
.site-main,
.site-footer {
  width: min(72rem, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem 1.5rem;
  padding: 1.25rem 0 1rem;
  border-bottom: 1px solid var(--line);
}

.brand-kicker,
.eyebrow,
.lab-number,
.stage-index,
.mode-flag,
.coming-soon,
.status {
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.brand-kicker {
  margin: 0;
  color: var(--amber);
  font-size: 0.95rem;
}

.brand-name {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 650;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 3rem;
  padding: 0.4rem 0.8rem;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid transparent;
}

.site-nav a[aria-current="page"] {
  border-color: var(--amber);
  color: var(--amber);
}

.mode-flag {
  margin: 0 0 0.35rem auto;
  color: var(--muted);
  font-size: 0.95rem;
}

.mode-dot {
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  margin-right: 0.4rem;
  border-radius: 50%;
  background: var(--teal);
  vertical-align: middle;
}

.mode-dot-live {
  background: var(--complete);
}

.site-main {
  padding: 1.75rem 0 3rem;
}

.site-footer {
  padding: 1rem 0 2rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-head h1 {
  margin: 0.2rem 0 0.6rem;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.15;
  font-weight: 650;
}

.eyebrow {
  margin: 0;
  color: var(--amber);
  font-size: 0.95rem;
}

.lede {
  margin: 0 0 1rem;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.15rem;
}

.panel,
.card,
.stage {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: 0.4rem;
}

.panel {
  padding: 1.25rem 1.35rem;
  margin: 0 0 1.5rem;
}

.panel h2,
.page-head + section h2,
section > h2 {
  margin-top: 0;
}

.panel-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.stat-line {
  margin: 0.25rem 0 0;
  font-size: 1.15rem;
}

.button,
.text-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.55rem 1.1rem;
  font: inherit;
  text-decoration: none;
}

.button {
  background: var(--amber);
  color: var(--amber-ink);
  font-weight: 650;
  border-radius: 0.3rem;
}

.button:hover {
  color: var(--amber-ink);
  filter: brightness(1.06);
}

.text-action {
  padding-left: 0;
  padding-right: 0;
  font-weight: 650;
}

.meter {
  height: 0.7rem;
  margin-top: 1rem;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.meter-fill {
  display: block;
  height: 100%;
  background: var(--amber);
  min-width: 0;
}

.lab-grid,
.lab-index,
.status-list,
.stage-rail,
.stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.card {
  padding: 1.15rem 1.25rem;
}

.card h3,
.lab-copy h2 {
  margin: 0.15rem 0 0.5rem;
  font-size: 1.35rem;
  line-height: 1.25;
}

.lab-number {
  margin: 0;
  color: var(--amber);
  font-size: 0.95rem;
}

.status {
  display: inline-block;
  margin: 0.35rem 0.5rem 0.35rem 0;
  color: var(--ink);
  font-size: 0.95rem;
}

.status::before {
  content: "";
  display: inline-block;
  width: 0.65rem;
  height: 0.65rem;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: var(--idle);
  vertical-align: middle;
}

.status-in_progress::before {
  background: var(--progress);
}

.status-complete::before {
  background: var(--complete);
}

.coming-soon {
  display: inline-block;
  margin: 0.35rem 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.lab-index {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.lab-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem 1rem;
  align-items: start;
}

.lab-action {
  grid-column: 1 / -1;
}

.action-held {
  color: var(--muted);
}

.stage-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.stage-rail a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.95rem;
}

.stage-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.stage {
  padding: 1.15rem 1.25rem;
  border-left: 4px solid var(--amber);
}

.stage h2 {
  margin: 0.15rem 0 0.4rem;
  font-size: 1.5rem;
}

.stage-index {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 1rem;
  margin: 0;
}

.stat-grid dt {
  color: var(--muted);
  font-size: 1rem;
}

.stat-grid dd {
  margin: 0.15rem 0 0;
  font-size: 2rem;
  font-weight: 650;
  line-height: 1.1;
}

.status-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
}

.status-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.8rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.status-title {
  font-size: 1.1rem;
  min-width: 12rem;
}

@media (min-width: 48rem) {
  .lab-grid {
    grid-template-columns: 1fr 1fr;
  }

  .lab-row {
    grid-template-columns: 3.5rem 1fr auto;
    align-items: center;
  }

  .lab-action {
    grid-column: auto;
  }
}

.roadmap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 1.5rem;
}

.roadmap h3 {
  margin: 0;
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.roadmap ul {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0;
}

.roadmap li,
.roadmap-compact {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--line);
}

.phase-status {
  font-family: var(--mono);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.phase-available {
  color: var(--teal);
}

.phase-planned {
  color: var(--muted);
}

@media (min-width: 48rem) {
  .roadmap {
    grid-template-columns: 1fr 1fr;
  }
}

.instrument label,
.tune-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin: 0.85rem 0;
  font-family: var(--mono);
  font-size: 0.95rem;
}

.instrument input[type="text"],
.instrument select,
.stage textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.55rem 0.75rem;
  font: inherit;
  color: var(--ink);
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 0.3rem;
}

.stage textarea {
  min-height: 8rem;
}

.instrument input[type="range"] {
  width: 100%;
  height: 2.75rem;
  margin: 0.35rem 0 0.6rem;
  accent-color: var(--amber);
}

.tune-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 1rem;
  align-items: end;
}

.tune-pad {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.tune-pad button,
.instrument > button,
.practice-question > button,
.stage button {
  min-height: 3rem;
  padding: 0.5rem 0.9rem;
  font: inherit;
  color: var(--ink);
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 0.3rem;
}

.sim-flag {
  margin: 0;
  color: var(--amber);
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

.rf-bench canvas {
  display: block;
  width: 100%;
  height: auto;
  margin: 0.5rem 0;
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  background: #14181c;
}

.freq-readout {
  margin: 0.15rem 0;
  font-family: var(--mono);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1.2;
}

.freq-units,
.freq-equal {
  margin-top: 0;
  font-family: var(--mono);
}

.band-map {
  position: relative;
  height: 2.75rem;
  margin: 1rem 0 0.4rem;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 0.3rem;
}

.band-marker,
.band-tick {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
}

.band-marker {
  z-index: 1;
  background: var(--amber);
}

.band-tick {
  background: var(--teal);
}

.spectrum-svg {
  display: block;
  width: 100%;
  height: auto;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 0.3rem;
}

.strength {
  height: 0.9rem;
  margin-top: 0.8rem;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.strength-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--teal);
}

.signal-legend {
  margin: 0.8rem 0;
  padding-left: 1.2rem;
}

.signal-legend li {
  margin: 0.35rem 0;
}

.feedback {
  color: var(--teal);
}

.challenge-prompt {
  font-size: 1.15rem;
}

.practice-question {
  margin: 1rem 0;
  padding: 0.9rem 0 0.2rem;
  border: 0;
  border-top: 1px solid var(--line);
}

.choice {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  margin: 0.45rem 0;
  min-height: 2.75rem;
}

.stage-rail a.stage-done {
  border-color: var(--complete);
}

.stage-complete {
  border-left-color: var(--complete);
}

@media (min-width: 48rem) {
  .tune-form {
    grid-template-columns: 1fr auto;
  }
}

.handheld {
  max-width: 26rem;
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
}

.handheld-note {
  margin: 0.4rem 0 0.8rem;
  color: var(--muted);
}

.handheld-display {
  padding: 0.85rem 0.9rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 0.6rem;
}

.noise-strip {
  display: block;
  width: 100%;
  height: 2rem;
  margin-top: 0.6rem;
}

.repeater-scene {
  margin: 0.5rem 0 1rem;
}

.band-strip,
.band-card {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.band-strip button.is-selected,
.instrument button[aria-pressed="true"],
.terrain-lab button[aria-pressed="true"] {
  border-color: var(--amber);
  color: var(--amber);
}

.circuit,
.antenna-bench,
.terrain-lab {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.circuit-path {
  font-family: var(--mono);
}

.swr-bars {
  display: grid;
  gap: 0.35rem;
  margin: 0.6rem 0;
}

.swr-forward,
.swr-reflected {
  display: block;
  height: 0.7rem;
  border-radius: 999px;
}

.swr-forward {
  width: 100%;
  background: var(--teal);
}

.swr-reflected {
  width: 0;
  background: var(--amber);
}

.field-reference {
  margin: 1rem 0;
  padding: 0.8rem 1rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 0.6rem;
}

.field-reference summary {
  cursor: pointer;
  min-height: 3rem;
  font-weight: 600;
}

.field-reference h3 {
  margin: 0.8rem 0 0.2rem;
  font-size: 1rem;
}

.mod-picture {
  font-family: var(--mono);
  min-height: 3rem;
}

.readiness-actions,
.readiness-nav,
.readiness-history {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-top: 0.8rem;
}

.readiness-actions select {
  min-height: 3rem;
  font: inherit;
  background: var(--bg-inset);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  padding: 0.4rem 0.6rem;
}

.button-quiet,
.readiness-choice {
  background: var(--bg-inset);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  font: inherit;
}

.button-quiet {
  min-height: 2.75rem;
  padding: 0.4rem 0.75rem;
}

.readiness-choice {
  display: block;
  width: 100%;
  text-align: left;
  margin: 0.4rem 0;
  padding: 0.75rem 0.9rem;
  min-height: 3rem;
}

.readiness-choice[aria-pressed="true"],
.readiness-nav [aria-current="true"] {
  border-color: var(--amber);
}

.readiness-answered {
  border-color: var(--teal);
}

.readiness-figure {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0.8rem 0;
  background: #f7f4ee;
  padding: 0.5rem;
}

.readiness-miss {
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}