:root {
  --studio-continuity: #675bff;
  --studio-world: #0f8f72;
  --studio-events: #3d6fe0;
  --studio-actions: #aa5a00;
  --studio-evidence: #8f3fa8;
}

body.studio-page {
  background: var(--bg);
  color: var(--ink);
}

.studio-shell {
  padding-bottom: 104px;
}

.studio-shell section {
  padding: 0;
}

.studio-hero,
.studio-scenario-chooser,
.studio-context-line,
.studio-scenario-header,
.studio-story-section,
.studio-surface-map,
.studio-secondary-actions,
.studio-stage,
.studio-inspector,
.studio-trace-rail,
.studio-payload,
.studio-empty-state {
  margin-bottom: 64px;
}

.studio-hero {
  margin-top: 56px;
}

.studio-hero h1,
.studio-scenario-header h1 {
  margin: 12px 0 14px;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.05;
}

.studio-hero h1 {
  font-size: clamp(2.2rem, 4.7vw, 4rem);
  max-width: none;
}

.studio-scenario-header h1 {
  font-size: clamp(1.9rem, 3.5vw, 3rem);
  max-width: none;
}

.studio-chip {
  margin: 0;
  display: inline-block;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
}

.studio-muted { color: var(--ink-muted) !important; }

.studio-summary,
.studio-hero p,
.studio-scenario-chooser p,
.studio-story-section p,
.studio-empty-state p,
.studio-trace-rail p {
  max-width: 72ch;
  line-height: 1.6;
}

.studio-scenario-chooser {
  margin-bottom: 62px;
}

.studio-scenario-header {
  margin-top: 22px;
}

.studio-context-line {
  margin-top: 40px;
  margin-bottom: 24px;
  border-top: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
  padding-top: 12px;
}
.studio-context-line p { margin: 8px 0 0; color: var(--ink-muted); font-size: 0.92rem; }
.studio-context-line .is-active { color: var(--ink); font-weight: 600; }

.studio-scenario-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 26px;
  margin-top: 24px;
}

.studio-scenario-card {
  text-decoration: none;
  color: var(--ink);
  border-top: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  padding-top: 14px;
}

.studio-scenario-card:hover,
.studio-scenario-card.is-active {
  text-decoration: none;
  border-top-color: color-mix(in srgb, var(--ink) 35%, var(--line));
}

.studio-scenario-card h3 {
  margin: 10px 0 8px;
  font-family: var(--serif);
  font-size: 1.25rem;
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink);
}

.studio-frame {
  margin-top: 12px;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.studio-header-meta { margin-top: 18px; color: var(--ink-muted); max-width: 72ch; }

.studio-story-section {
  border-top: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  padding-top: 38px;
}

.studio-story-section h2 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.7vw, 2.1rem);
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink);
}

.studio-story-bullets {
  margin: 18px 0 0;
  padding-left: 18px;
  max-width: 72ch;
}

.studio-story-bullets li { margin-bottom: 8px; }

.studio-live-demo {
  border-top: 0;
  padding-top: 4px;
}

.studio-walkthrough-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0 30px;
}

.studio-walkthrough-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.95fr);
  gap: 36px;
}

.studio-walkthrough-grid.is-hidden {
  display: none;
}

.studio-walkthrough-left {
  border-left: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  padding-left: 18px;
}

.studio-walkthrough-step {
  position: relative;
  margin-bottom: 18px;
  opacity: 0.25;
  transition: opacity 220ms ease;
}

.studio-walkthrough-step.is-visible {
  opacity: 1;
}

.studio-walkthrough-step::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--studio-continuity) 60%, white 40%);
}

.studio-walkthrough-step h3,
.studio-story-steps h3 {
  margin: 8px 0;
  font-family: var(--serif);
  font-size: 1.1rem;
  text-transform: none;
  letter-spacing: 0;
}

.studio-walkthrough-right.is-hidden {
  display: none;
}

.studio-story-steps {
  margin: 16px 0 0;
  padding-left: 18px;
  max-width: 76ch;
}

.studio-story-steps li { margin-bottom: 14px; }

.studio-loading-state {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: -28px;
  margin-bottom: 48px;
}

.studio-throbber {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--studio-continuity) 70%, white 30%);
  animation: studioPulse 980ms ease-in-out infinite;
}

.studio-surface-map h2 { margin: 0 0 16px; font-size: 1.3rem; font-family: var(--serif); text-transform: none; letter-spacing: 0; color: var(--ink); }
.studio-surface-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.studio-surface-item { border-top: 1px solid var(--line); padding-top: 14px; background: color-mix(in srgb, var(--surface) 90%, white 10%); padding: 16px; border-radius: 10px; }
.studio-surface-item strong { display: block; margin: 4px 0; }
.studio-surface-item p { margin: 0; color: var(--ink-muted); font-size: 0.92rem; }

.studio-secondary-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 46px; }
.studio-action,
.studio-payload-toggle {
  appearance: none;
  border: 1px solid color-mix(in srgb, var(--line) 85%, white 15%);
  border-radius: 999px;
  padding: 11px 18px;
  font-size: 0.86rem;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.studio-action.is-secondary { font-size: 0.8rem; padding: 8px 14px; color: var(--ink-muted); }

.studio-action:hover,
.studio-payload-toggle:hover { border-color: color-mix(in srgb, var(--ink) 55%, var(--line)); }

.studio-action.is-primary {
  background: color-mix(in srgb, var(--ink) 88%, white 12%);
  color: var(--bg);
  border-color: color-mix(in srgb, var(--ink) 75%, var(--line));
}

.studio-action.is-primary:hover {
  background: color-mix(in srgb, var(--ink) 82%, white 18%);
  border-color: color-mix(in srgb, var(--ink) 88%, var(--line));
}

.studio-stage {
  display: block;
}

.studio-scene-canvas,
.studio-inspector,
.studio-trace-rail,
.studio-payload,
.studio-empty-state,
.studio-state-banner {
  border-top: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  padding-top: 24px;
}

.scene-grid { display: none; }
.scene-content h2,
.studio-inspector h3,
.studio-trace-rail h3 {
  margin: 10px 0 16px;
  font-family: var(--serif);
  font-size: 1.35rem;
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0;
}

.scene-columns,
.scene-causal-rail,
.scene-progression {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

.scene-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.scene-causal-rail { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.scene-progression { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.scene-columns article,
.scene-causal-rail article,
.scene-progression article {
  border-top: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
  padding-top: 12px;
  background: color-mix(in srgb, var(--surface) 94%, white 6%);
  padding: 14px;
  border-radius: 12px;
}

.scene-columns h3,
.studio-inspector h4,
.studio-payload h3 {
  margin: 0 0 8px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
}

.scene-columns ul,
.studio-api-route-list,
.studio-trace-rail ol { list-style: none; margin: 0; padding-left: 0; }
.scene-columns li,
.studio-api-route-list li { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 6px; font-size: 0.9rem; }
.scene-columns em,
.studio-api-route-list span,
.studio-timestamp { color: var(--ink-muted); font-size: 0.82rem; }

.studio-scene-lead { font-size: 1.06rem; max-width: 70ch; }
.scene-lanes { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.studio-lane { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; border: 1px solid currentColor; border-radius: 999px; padding: 4px 8px; }
.lane-continuity { color: var(--studio-continuity); }
.lane-world { color: var(--studio-world); }
.lane-events { color: var(--studio-events); }
.lane-actions { color: var(--studio-actions); }
.lane-evidence { color: var(--studio-evidence); }

.studio-inspector-group { margin-top: 16px; border-top: 1px solid color-mix(in srgb, var(--line) 65%, transparent); padding-top: 12px; }
.studio-inspector pre,
.studio-payload pre { margin: 8px 0 0; padding: 10px; border: 1px solid color-mix(in srgb, var(--line) 75%, transparent); border-radius: 10px; background: color-mix(in srgb, var(--surface) 90%, white 10%); max-height: 240px; overflow: auto; font-size: 0.78rem; color: var(--ink); }
.studio-inspector details,
.studio-trace-rail details,
.studio-payload details { margin-top: 10px; }
.studio-inspector summary,
.studio-trace-rail summary,
.studio-payload summary { cursor: pointer; color: var(--ink-muted); font-size: 0.85rem; }

.studio-evidence-nested {
  margin-left: 16px;
  padding-left: 8px;
  border-left: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}

.is-hidden {
  display: none !important;
}

.studio-trace-rail { display: grid; grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr); gap: 28px; }
.studio-trace-rail li { display: grid; grid-template-columns: 74px 1fr; gap: 10px; margin-bottom: 12px; }
.studio-trace-rail li.is-major { border-left: 2px solid color-mix(in srgb, var(--studio-continuity) 55%, transparent); padding-left: 10px; }

.studio-state-banner.tone-warning { border-top-color: color-mix(in srgb, #a96a00 35%, var(--line)); }
.studio-state-banner.tone-error { border-top-color: color-mix(in srgb, #912f2f 40%, var(--line)); }

.studio-reveal { opacity: 0; transform: translateY(10px); animation: studioReveal 480ms ease forwards; }

@keyframes studioReveal {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes studioPulse {
  0%, 100% { transform: scale(0.82); opacity: 0.45; }
  50% { transform: scale(1); opacity: 1; }
}

@media (max-width: 980px) {
  .studio-shell { padding: 0 20px 52px; }
  .studio-stage,
  .studio-trace-rail,
  .scene-columns,
  .scene-causal-rail,
  .studio-walkthrough-grid { grid-template-columns: 1fr; }
  .studio-walkthrough-left { border-left: 0; border-top: 1px solid color-mix(in srgb, var(--line) 70%, transparent); padding-left: 0; padding-top: 16px; }
  .studio-walkthrough-step::before { left: 0; top: -9px; }
}