:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-2: #0b1524;
  --panel: rgba(12, 27, 45, 0.86);
  --panel-2: rgba(15, 38, 60, 0.86);
  --ink: #f2f8ff;
  --muted: #aebed0;
  --line: rgba(135, 197, 255, 0.18);
  --blue: #53b8ff;
  --cyan: #5be7ff;
  --green: #66d99a;
  --gold: #d7b15c;
  --red: #ff766e;
  --violet: #9f8cff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(115deg, rgba(83, 184, 255, 0.12), transparent 28rem),
    linear-gradient(245deg, rgba(215, 177, 92, 0.12), transparent 24rem),
    linear-gradient(180deg, #06101c 0%, var(--bg) 52%, #09131f 100%);
  color: var(--ink);
}

html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.lab-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(16px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  background: rgba(7, 17, 31, 0.88);
  backdrop-filter: blur(18px);
}

.brand,
nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  text-decoration: none;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(83, 184, 255, 0.58);
  background: linear-gradient(135deg, rgba(83, 184, 255, 0.24), rgba(215, 177, 92, 0.2));
  color: #ffffff;
  font-size: 13px;
  letter-spacing: 0.08em;
}

nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.status-chip {
  min-width: 150px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.status-chip.live {
  border-color: rgba(102, 217, 154, 0.55);
  color: var(--green);
  background: rgba(102, 217, 154, 0.1);
}

.status-chip.warn {
  border-color: rgba(255, 118, 110, 0.55);
  color: var(--red);
}

.lab-shell {
  width: min(1480px, calc(100% - 32px));
  max-width: 100%;
  margin: 0 auto;
  padding: 34px 0 78px;
}

.lab-command {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 18px;
  padding: 20px 0 16px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 820px;
  margin-bottom: 10px;
  font-size: 50px;
  line-height: 1;
  overflow-wrap: break-word;
}

h2 {
  margin-bottom: 10px;
  font-size: 42px;
  line-height: 1;
}

h3 {
  margin-bottom: 14px;
  font-size: 18px;
}

.lede {
  max-width: 700px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.45;
  overflow-wrap: break-word;
}

.command-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.concept-visual,
.simulator-grid > *,
.readiness-layout > *,
.diagram-grid > *,
.quiz-card {
  min-width: 0;
}

.command-badges span,
.run-state,
.module,
.metric-strip article,
.readiness-list article,
.claim-list li,
.quiz-card,
.flow-diagram,
.budget-panel,
.claim-panel,
.readiness-panel {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
}

.command-badges span {
  padding: 10px 12px;
  color: var(--ink);
  font-weight: 800;
  white-space: nowrap;
}

.concept-visual {
  margin: 0;
}

.concept-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  border: 1px solid rgba(215, 177, 92, 0.36);
  box-shadow: 0 28px 88px rgba(0, 0, 0, 0.42);
}

.concept-visual figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 13px;
}

.simulator-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 330px;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(83, 184, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(83, 184, 255, 0.05) 1px, transparent 1px),
    rgba(5, 13, 23, 0.72);
  background-size: 32px 32px;
}

.module-rail,
.control-panel {
  align-self: start;
  position: sticky;
  top: 82px;
}

.module-rail,
.control-panel,
.emulator-panel {
  min-width: 0;
}

.rail-label {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.module {
  display: block;
  width: 100%;
  margin-bottom: 10px;
  padding: 14px;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.module:focus-visible,
.view-switch button:focus-visible,
.preset-bank button:focus-visible,
.primary-action:focus-visible,
.secondary-action:focus-visible,
.quiz-card button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.module.active {
  border-color: rgba(83, 184, 255, 0.7);
  background: linear-gradient(180deg, rgba(32, 91, 137, 0.86), rgba(14, 38, 63, 0.9));
}

.module span,
.module small {
  display: block;
}

.module small {
  margin-top: 4px;
  color: var(--muted);
}

.emulator-panel,
.control-panel {
  border: 1px solid var(--line);
  background: rgba(6, 18, 32, 0.76);
}

.panel-head,
.control-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.panel-head h2 {
  font-size: 24px;
}

.panel-tools {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.view-switch {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  min-width: 230px;
  border: 1px solid rgba(135, 197, 255, 0.18);
  background: rgba(2, 9, 18, 0.44);
}

.view-switch button {
  min-height: 40px;
  border: 0;
  border-right: 1px solid rgba(135, 197, 255, 0.16);
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-size: 12px;
  font-weight: 900;
}

.view-switch button:last-child {
  border-right: 0;
}

.view-switch button.active {
  color: #06101c;
  background: var(--blue);
}

.run-state {
  min-width: 160px;
  padding: 10px 12px;
  text-align: right;
}

.run-state span,
.metric-strip span,
.build-spec span,
.budget-facts dt {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.run-state strong {
  display: block;
  margin-top: 4px;
  color: var(--green);
}

.canvas-wrap {
  padding: 16px;
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 49 / 34;
  border: 1px solid rgba(83, 184, 255, 0.16);
  background: rgba(2, 9, 18, 0.82);
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  padding: 0 16px 16px;
}

.metric-strip article {
  min-width: 0;
  padding: 14px;
}

.metric-strip strong {
  display: block;
  margin: 6px 0 10px;
  font-size: 24px;
}

meter {
  width: 100%;
  height: 10px;
}

.control-panel {
  padding-bottom: 14px;
}

.primary-action,
.secondary-action,
.quiz-card button {
  min-height: 42px;
  border: 1px solid rgba(83, 184, 255, 0.38);
  color: var(--ink);
  background: rgba(83, 184, 255, 0.12);
  cursor: pointer;
}

.primary-action {
  padding: 0 16px;
  border-color: rgba(102, 217, 154, 0.5);
  background: rgba(102, 217, 154, 0.18);
}

.preset-bank {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  padding: 14px 18px 0;
}

.preset-bank button {
  min-height: 36px;
  border: 1px solid rgba(135, 197, 255, 0.2);
  color: var(--muted);
  background: rgba(83, 184, 255, 0.08);
  cursor: pointer;
  font-size: 12px;
  font-weight: 900;
}

.preset-bank button.active {
  border-color: rgba(215, 177, 92, 0.58);
  color: #06101c;
  background: var(--gold);
}

.control-stack {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.control-stack label {
  display: grid;
  gap: 8px;
}

.control-stack label span {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.control-stack strong {
  color: var(--ink);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}

.build-spec {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 0 18px 14px;
}

.build-spec span {
  padding: 10px;
  border: 1px solid rgba(135, 197, 255, 0.14);
  background: rgba(255, 255, 255, 0.03);
}

.build-spec strong {
  display: block;
  margin-top: 4px;
  color: var(--gold);
  font-size: 18px;
}

.secondary-action {
  width: calc(100% - 36px);
  margin: 0 18px;
}

.readiness-layout,
.diagram-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.82fr;
  gap: 14px;
  margin-top: 16px;
}

.readiness-panel,
.budget-panel,
.claim-panel,
.quiz-panel,
.diagram-section {
  padding: 22px;
}

.section-title {
  margin-bottom: 18px;
}

.readiness-list {
  display: grid;
  gap: 10px;
}

.readiness-list article {
  padding: 14px;
}

.readiness-list strong,
.readiness-list span {
  display: block;
}

.readiness-list span {
  margin-top: 4px;
  color: var(--muted);
}

.readiness-list .ok strong {
  color: var(--green);
}

.readiness-list .warn strong {
  color: var(--gold);
}

.readiness-list .bad strong {
  color: var(--red);
}

.budget-bars {
  display: flex;
  height: 42px;
  overflow: hidden;
  border: 1px solid rgba(135, 197, 255, 0.2);
}

.budget-bars span {
  display: grid;
  width: calc(var(--size) * 1%);
  min-width: 44px;
  place-items: center;
  background: var(--tone);
  color: #06101c;
  font-size: 12px;
  font-weight: 900;
}

.budget-facts {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.budget-facts div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  border-bottom: 1px solid rgba(135, 197, 255, 0.14);
  padding-bottom: 10px;
}

.budget-facts dd {
  margin: 0;
  color: var(--ink);
  text-align: right;
}

.claim-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.claim-list li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px;
}

.claim-list span {
  color: var(--muted);
}

.claim-list strong {
  color: var(--gold);
}

.reference-section,
.diagram-section,
.quiz-panel {
  margin-top: 16px;
  border: 1px solid var(--line);
  background: rgba(6, 18, 32, 0.72);
}

.reference-section {
  display: grid;
  grid-template-columns: minmax(240px, 0.28fr) minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  padding: 22px;
}

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

.flow-diagram {
  padding: 18px;
}

.flow-row {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}

.flow-row.payment {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.flow-row span {
  position: relative;
  min-height: 54px;
  display: grid;
  place-items: center;
  padding: 8px;
  border: 1px solid rgba(83, 184, 255, 0.24);
  color: var(--ink);
  text-align: center;
  background: rgba(83, 184, 255, 0.08);
  font-size: 13px;
  font-weight: 800;
}

.flow-row span:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -8px;
  width: 8px;
  border-top: 2px solid var(--gold);
}

.quiz-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.quiz-card {
  padding: 16px;
}

.quiz-card p {
  color: var(--muted);
  line-height: 1.5;
}

.quiz-card button {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 8px;
  text-align: left;
}

.quiz-card button.correct {
  border-color: rgba(102, 217, 154, 0.62);
  color: var(--green);
}

.quiz-card button.wrong {
  border-color: rgba(255, 118, 110, 0.62);
  color: var(--red);
}

.quiz-score {
  margin: 16px 0 0;
  color: var(--gold);
  font-weight: 900;
}

@media (max-width: 1180px) {
  .lab-command,
  .simulator-grid,
  .readiness-layout,
  .reference-section,
  .diagram-grid {
    grid-template-columns: 1fr;
  }

  .module-rail {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
  }

  .rail-label {
    grid-column: 1 / -1;
  }

  .module {
    margin: 0;
  }

  .module-rail,
  .control-panel {
    position: static;
  }

  .command-badges {
    justify-content: flex-start;
  }

  h1 {
    font-size: 44px;
  }
}

@media (min-width: 1181px) and (max-width: 1360px) {
  .lab-shell {
    width: calc(100% - 24px);
  }

  .simulator-grid {
    grid-template-columns: 180px minmax(0, 1fr) 300px;
  }

  .module {
    padding: 12px;
  }

  .panel-head,
  .control-head {
    padding: 14px;
  }

  .panel-tools {
    align-items: stretch;
    flex-direction: column;
  }

  h1 {
    font-size: 58px;
  }
}

@media (max-width: 980px) {
  .lab-command {
    align-items: start;
  }

  .panel-head,
  .control-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .panel-tools,
  .view-switch {
    width: 100%;
  }

  .run-state {
    width: 100%;
    text-align: left;
  }

  .metric-strip,
  .control-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .lab-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .lab-shell {
    width: calc(100% - 20px);
  }

  .lab-command {
    min-height: auto;
    padding: 22px 0 18px;
  }

  .lede {
    font-size: 17px;
  }

  .metric-strip,
  .control-stack,
  .preset-bank,
  .quiz-list,
  .module-rail,
  .flow-row,
  .flow-row.payment,
  .build-spec {
    grid-template-columns: 1fr;
  }

  .canvas-wrap {
    padding: 10px;
  }

  .view-switch {
    grid-template-columns: 1fr;
  }

  .view-switch button {
    border-right: 0;
    border-bottom: 1px solid rgba(135, 197, 255, 0.16);
  }

  .view-switch button:last-child {
    border-bottom: 0;
  }

  h1 {
    max-width: 100%;
    font-size: 30px;
    line-height: 1.02;
  }

  h2 {
    font-size: 32px;
  }

  .command-badges {
    display: grid;
    grid-template-columns: 1fr;
  }

  .command-badges span {
    white-space: normal;
  }

  .simulator-grid {
    padding: 10px;
  }

  .panel-head h2 {
    font-size: 22px;
  }

  .metric-strip strong {
    font-size: 21px;
  }
}

@media (max-width: 430px) {
  .lab-topbar {
    gap: 12px;
    padding: 12px;
  }

  nav {
    gap: 10px;
  }

  nav a {
    font-size: 13px;
  }

  .status-chip {
    width: 100%;
    min-width: 0;
  }

  .lab-shell {
    width: calc(100% - 16px);
    padding-top: 24px;
  }

  h1 {
    font-size: 26px;
  }

  .lede {
    font-size: 15px;
  }

  .module,
  .metric-strip article,
  .control-stack label,
  .build-spec span {
    padding: 12px;
  }

  .view-switch {
    min-width: 0;
  }

  .canvas-wrap {
    overflow: hidden;
  }
}