:root {
  color-scheme: light;
  --cr-font-sans: "Onest Variable", "Segoe UI", Arial, sans-serif;
  --cr-font-mono: "JetBrains Mono Variable", "SFMono-Regular", Consolas, monospace;
  --ink: #111b29;
  --ink-soft: #526477;
  --ink-faint: #687b90;
  --paper: #f7f8fa;
  --surface: #ffffff;
  --surface-soft: #eef2f6;
  --line: #d2dae5;
  --line-strong: #9dabb9;
  --green: #173f6b;
  --green-dark: #0e1929;
  --green-soft: #e8f0fb;
  --success: #17623d;
  --success-soft: #e5f4eb;
  --amber: #8b5b00;
  --amber-soft: #fff4d8;
  --red: #a52622;
  --red-soft: #fff0ef;
  --radius-control: 6px;
  --radius-surface: 12px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--cr-font-sans);
  font-size: 16px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

button,
input { font: inherit; }

button,
a,
input { touch-action: manipulation; }

button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .52; }
a { color: var(--green-dark); }
code { font-family: var(--cr-font-mono); font-size: .86em; overflow-wrap: anywhere; }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: #fff;
  background: var(--green-dark);
  border-radius: var(--radius-control);
  transform: translateY(-150%);
}

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

:focus-visible {
  outline: 3px solid rgba(23, 63, 107, .42);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.mock-studio-main {
  width: min(1380px, calc(100% - 48px));
  margin: 0 auto;
  padding: 58px 0 44px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green-dark);
  font: 760 11px/1.3 var(--cr-font-mono);
  letter-spacing: .13em;
  text-transform: uppercase;
}

.studio-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(300px, .7fr);
  gap: clamp(36px, 7vw, 96px);
  align-items: end;
  padding-bottom: 38px;
}

.studio-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(42px, 6vw, 78px);
  font-weight: 730;
  letter-spacing: -.055em;
  line-height: .98;
}

.studio-hero h1 em { color: var(--green); font-style: normal; font-weight: 520; }

.studio-hero-copy > p:not(.eyebrow) {
  max-width: 880px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: clamp(17px, 1.8vw, 21px);
}

.hero-actions,
.session-actions,
.form-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.hero-actions { margin-top: 28px; }

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  background: var(--surface);
  color: var(--ink);
  font-weight: 720;
  line-height: 1.25;
  text-decoration: none;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease;
}

.button:hover:not(:disabled) { border-color: var(--green); color: var(--green-dark); }
.button.primary { background: var(--green); border-color: var(--green); color: #fff; }
.button.primary:hover:not(:disabled) { background: var(--green-dark); color: #fff; }
.button.quiet { background: transparent; }

.studio-contract {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--green);
  border-radius: var(--radius-surface);
}

.studio-contract > strong { display: block; font: 720 15px/1.4 var(--cr-font-mono); overflow-wrap: anywhere; }
.studio-contract dl { display: grid; gap: 12px; margin: 20px 0 0; }
.studio-contract dl div { display: grid; gap: 3px; padding-top: 10px; border-top: 1px solid var(--line); }
.studio-contract dt { color: var(--ink-faint); font: 700 10px/1.3 var(--cr-font-mono); text-transform: uppercase; }
.studio-contract dd { margin: 0; font-weight: 680; overflow-wrap: anywhere; }

.truth-register {
  display: grid;
  grid-template-columns: minmax(250px, .8fr) minmax(0, 2fr);
  gap: 28px;
  align-items: center;
  margin: 8px 0 28px;
  padding: 22px 24px;
  color: #f4f7fb;
  background: #0e1929;
  border-radius: var(--radius-surface);
}

.truth-register .eyebrow { color: #9ec8f2; }

.truth-register dl {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(255, 255, 255, .18);
}

.truth-register dl div { display: grid; gap: 4px; padding: 11px 13px; background: #0e1929; }
.truth-register dt { color: #b8c6d6; font: 650 9px/1.3 var(--cr-font-mono); overflow-wrap: anywhere; }
.truth-register dd { margin: 0; color: #9ec8f2; font: 760 13px/1.3 var(--cr-font-mono); }

.error-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  margin: 0 0 28px;
  padding: 22px 24px;
  background: var(--red-soft);
  border: 1px solid #df9995;
  border-left: 5px solid var(--red);
  border-radius: 8px;
}

.error-summary .eyebrow { color: var(--red); }
.error-summary h2 { margin: 0 0 7px; font-size: 20px; }
.error-summary p { margin: 0; color: #682b28; }
.error-summary ul { margin: 10px 0 0; padding-left: 20px; }
.error-summary a { font-weight: 700; }
.error-summary code { display: block; margin-top: 8px; color: var(--red); }

.session-register {
  display: grid;
  grid-template-columns: minmax(260px, .85fr) minmax(360px, 1.15fr);
  gap: 38px;
  margin-bottom: 28px;
  padding: 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-surface);
}

.session-register h2 { margin: 0 0 8px; font-size: 25px; letter-spacing: -.03em; }
.session-register p { margin: 0; color: var(--ink-soft); }
.session-controls { display: grid; align-content: center; gap: 8px; }
.session-controls label { display: grid; gap: 6px; font-weight: 720; }
.session-controls small { color: var(--ink-faint); }
.session-status { color: var(--amber); font: 720 11px/1.4 var(--cr-font-mono); }

input {
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
}

input:hover:not(:disabled) { border-color: var(--green); }
input[aria-invalid="true"] { border-color: var(--red); background: #fffafa; }

.scenario-rail {
  position: sticky;
  z-index: 20;
  top: var(--cr-suite-height, 0px);
  display: flex;
  gap: 4px;
  margin: 0 0 28px;
  padding: 6px;
  overflow-x: auto;
  background: rgba(247, 250, 248, .96);
  border: 1px solid var(--line);
  border-radius: 8px;
  scrollbar-width: thin;
}

.scenario-rail a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 8px 13px;
  border-radius: 5px;
  color: var(--ink-soft);
  font: 700 12px/1.3 var(--cr-font-mono);
  text-decoration: none;
  white-space: nowrap;
}

.scenario-rail a:hover { color: var(--green-dark); background: var(--green-soft); }
.scenario-rail a[aria-current="page"] { color: #fff; background: var(--green); }

.studio-workspace {
  display: grid;
  grid-template-columns: minmax(400px, .85fr) minmax(0, 1.15fr);
  gap: 24px;
  align-items: start;
}

.fixture-form,
.result-register {
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-surface);
}

.fixture-form > header,
.result-register > header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
}

.fixture-form h2,
.result-register h2 { margin: 0; font-size: 24px; letter-spacing: -.03em; }
.fixture-form > header > span,
.run-status { color: var(--ink-faint); font: 720 10px/1.4 var(--cr-font-mono); }
.run-status[data-state="complete"] { color: var(--success); }
.run-status[data-state="running"] { color: var(--amber); }
.run-status[data-state="failed"] { color: var(--red); }

.form-intro { margin: 0; padding: 18px 24px; color: var(--ink-soft); border-bottom: 1px solid var(--line); }

.fixture-form fieldset {
  margin: 0;
  padding: 22px 24px 24px;
  border: 0;
  border-bottom: 1px solid var(--line);
}

.fixture-form legend {
  padding: 0;
  color: var(--ink);
  font: 730 13px/1.3 var(--cr-font-mono);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.field { min-width: 0; display: grid; align-content: start; gap: 6px; }
.field.wide { grid-column: 1 / -1; }
.field > span { font-weight: 700; }
.field > small { color: var(--ink-faint); font-size: 12px; }
.field .field-error { color: var(--red); font-weight: 650; }

.form-actions {
  padding: 22px 24px;
}

.form-actions p { flex: 1 1 260px; margin: 0; }
.form-actions p strong,
.form-actions p span { display: block; }
.form-actions p span { color: var(--ink-soft); font-size: 13px; }
.form-actions output { flex-basis: 100%; color: var(--ink-soft); font: 650 11px/1.4 var(--cr-font-mono); }

.result-empty { margin: 20px 24px 0; padding: 18px; background: var(--surface-soft); border-left: 4px solid var(--line-strong); }
.result-empty strong { display: block; }
.result-empty p { margin: 5px 0 0; color: var(--ink-soft); }

.run-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 24px 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.run-facts div { min-width: 0; padding: 11px 12px; background: var(--surface-soft); }
.run-facts dt { color: var(--ink-faint); font: 650 9px/1.3 var(--cr-font-mono); overflow-wrap: anywhere; }
.run-facts dd { margin: 4px 0 0; color: var(--green-dark); font: 750 12px/1.4 var(--cr-font-mono); overflow-wrap: anywhere; }

.artifact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 20px 0 0;
  border-top: 1px solid var(--line);
}

.artifact {
  min-width: 0;
  padding: 20px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--cr-suite-height, 0px) + 78px);
}

.artifact:nth-child(even) { border-right: 0; }
.artifact[data-selected="true"] { background: var(--green-soft); box-shadow: inset 4px 0 0 var(--green); }

.artifact header {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  gap: 11px;
  align-items: center;
}

.artifact header > span {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  color: var(--green-dark);
  font: 700 11px/1 var(--cr-font-mono);
}

.artifact header small { color: var(--ink-faint); font: 650 9px/1.3 var(--cr-font-mono); }
.artifact h3 { margin: 2px 0 0; font-size: 17px; line-height: 1.25; }
.artifact header b { color: var(--ink-faint); font: 720 9px/1.3 var(--cr-font-mono); text-align: right; }
.artifact[data-state="verified"] header b { color: var(--success); }
.artifact > p { margin: 13px 0 0; color: var(--ink-soft); font-size: 13px; }
.artifact dl { display: grid; gap: 7px; margin: 14px 0 0; }
.artifact dl div { display: grid; grid-template-columns: minmax(90px, .75fr) minmax(0, 1.25fr); gap: 10px; padding-top: 7px; border-top: 1px solid var(--line); }
.artifact dt { color: var(--ink-faint); font: 650 9px/1.4 var(--cr-font-mono); overflow-wrap: anywhere; }
.artifact dd { margin: 0; font: 650 11px/1.4 var(--cr-font-mono); overflow-wrap: anywhere; }

.checks-register { padding: 22px 24px; border-top: 1px solid var(--line); }
.checks-register header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.checks-register h3 { margin: 0; font-size: 18px; }
.checks-register header span { font: 720 11px/1.3 var(--cr-font-mono); }
.checks-register ol,
.trace-register ol { display: grid; gap: 8px; margin: 15px 0 0; padding: 0; list-style: none; }
.checks-register li,
.trace-register li { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; padding: 10px 0; border-top: 1px solid var(--line); }
.checks-register li span,
.trace-register li span { color: var(--ink-faint); font: 650 10px/1.4 var(--cr-font-mono); }
.checks-register li b { color: var(--success); font: 720 10px/1.4 var(--cr-font-mono); }

.trace-register { padding: 18px 24px 22px; border-top: 1px solid var(--line); }
.trace-register summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; font-weight: 720; }

.production-boundary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  margin-top: 28px;
  padding: 22px 24px;
  background: var(--amber-soft);
  border: 1px solid #d5b56d;
  border-left: 5px solid var(--amber);
  border-radius: 8px;
}

.production-boundary > span,
.production-boundary code { color: var(--amber); font: 720 10px/1.4 var(--cr-font-mono); }
.production-boundary strong { display: block; color: #664500; }
.production-boundary p { margin: 4px 0 0; color: #654f22; }

.studio-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 28px;
  padding: 20px 4px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font: 650 11px/1.4 var(--cr-font-mono);
}

@media (max-width: 1080px) {
  .studio-workspace { grid-template-columns: 1fr; }
  .fixture-form { order: 0; }
  .result-register { order: 1; }
}

@media (max-width: 860px) {
  .mock-studio-main { width: min(100% - 32px, 1380px); padding-top: 40px; }
  .studio-hero,
  .session-register { grid-template-columns: 1fr; gap: 24px; }
  .truth-register { grid-template-columns: 1fr; }
  .run-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .production-boundary { grid-template-columns: 1fr; gap: 8px; }
}

@media (max-width: 620px) {
  .mock-studio-main { width: min(100% - 24px, 1380px); padding-top: 28px; }
  .studio-hero h1 { font-size: clamp(38px, 13vw, 56px); }
  .hero-actions .button,
  .session-actions .button { width: 100%; }
  .truth-register { padding: 20px; }
  .truth-register dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .error-summary { grid-template-columns: 1fr; }
  .session-register { padding: 20px; }
  .scenario-rail { margin-inline: -12px; border-radius: 0; }
  .fixture-form > header,
  .result-register > header,
  .form-actions { padding: 20px; }
  .fixture-form fieldset { padding: 20px; }
  .form-grid,
  .run-facts,
  .artifact-grid { grid-template-columns: 1fr; }
  .artifact { border-right: 0; }
  .artifact header { grid-template-columns: 38px minmax(0, 1fr); }
  .artifact header b { grid-column: 2; text-align: left; }
  .artifact dl div { grid-template-columns: 1fr; gap: 3px; }
  .studio-footer { flex-direction: column; }
}

@media (max-height: 540px) and (orientation: landscape) {
  .scenario-rail { position: static; }
}

@media (pointer: coarse) {
  .button,
  .scenario-rail a,
  input,
  .trace-register summary { min-height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}