:root {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--page-gradient);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--page-gradient);
}

button,
a {
  font: inherit;
}

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

.lab-shell,
.lab-footer {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.lab-shell {
  padding: 3.2rem 0 4rem;
}

.lab-hero {
  padding: 2.2rem 0 2.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 2rem;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent-cool);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0.65rem;
  color: var(--text-strong);
  font-size: clamp(2.5rem, 8vw, 5.2rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 0.7rem;
  color: var(--text-strong);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
}

p {
  color: var(--muted-strong);
  line-height: 1.65;
}

.lede {
  max-width: 46rem;
  margin-bottom: 0;
  font-size: 1.05rem;
}

.mode-card {
  min-width: 17rem;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  border: 1px solid var(--good);
  border-radius: 0.85rem;
  background: color-mix(in srgb, var(--good) 9%, var(--panel));
}

.mode-card strong,
.mode-card small {
  display: block;
}

.mode-card small {
  margin-top: 0.22rem;
  color: var(--muted);
}

.mode-dot {
  width: 0.72rem;
  height: 0.72rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--good) 20%, transparent);
}

.lab-card {
  padding: 1.4rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--panel-glass-strong);
  box-shadow: var(--shadow);
}

.lab-locked {
  max-width: 38rem;
  margin: 3rem auto;
  text-align: center;
}

.lab-workspace {
  display: grid;
  grid-template-columns: minmax(19rem, 0.85fr) minmax(24rem, 1.15fr);
  gap: 1rem;
}

.card-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.test-pill,
.count-pill,
.state-pill {
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  color: var(--accent-cool);
  background: var(--chip-bg);
  font: 800 0.68rem var(--font-mono);
  letter-spacing: 0.06em;
}

.boundary-list {
  margin: 1.25rem 0;
  border-top: 1px solid var(--border);
}

.boundary-list div {
  padding: 0.65rem 0;
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.8rem;
  border-bottom: 1px solid var(--border);
}

.boundary-list dt {
  color: var(--muted);
  font-size: 0.75rem;
}

.boundary-list dd {
  margin: 0;
  overflow-wrap: anywhere;
  font: 0.75rem var(--font-mono);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

button {
  min-height: 2.7rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border-soft);
  border-radius: 0.68rem;
  color: var(--text);
  background: var(--panel-strong);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 750;
}

button.primary {
  border-color: var(--accent-cool);
  color: var(--accent-cool-ink);
  background: var(--accent-cool);
}

button.secondary {
  color: var(--accent-cool);
}

button:disabled {
  cursor: wait;
  opacity: 0.55;
}

.status-line {
  min-height: 1.5rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.status-line[data-kind="error"] {
  color: var(--warn);
}

.status-line[data-kind="success"] {
  color: var(--good);
}

.ledger-note {
  margin-bottom: 1rem;
  font-size: 0.82rem;
}

.ledger {
  display: grid;
  gap: 0.65rem;
}

.empty-ledger {
  padding: 2rem 1rem;
  border: 1px dashed var(--border-soft);
  border-radius: 0.7rem;
  color: var(--muted);
  text-align: center;
}

.ledger-row {
  padding: 0.85rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--panel);
}

.ledger-row code {
  display: block;
  margin-bottom: 0.35rem;
  overflow-wrap: anywhere;
  color: var(--text-strong);
  font: 0.72rem var(--font-mono);
}

.ledger-meta {
  color: var(--muted);
  font-size: 0.68rem;
}

.state-pill.succeeded {
  color: var(--good);
}

.state-pill.refunded {
  color: var(--warn);
}

.next-boundary {
  margin-top: 1rem;
}

.next-boundary a {
  color: var(--accent-cool);
}

.lab-footer {
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

[hidden] {
  display: none !important;
}

@media (max-width: 820px) {
  .lab-hero,
  .lab-workspace {
    grid-template-columns: 1fr;
  }

  .mode-card {
    min-width: 0;
  }
}

@media (max-width: 560px) {
  .lab-shell,
  .lab-footer {
    width: min(100% - 24px, 1120px);
  }

  .lab-shell {
    padding-top: 1.2rem;
  }

  .boundary-list div,
  .ledger-row {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}