.tutorial-hero {
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
}

.tutorial-hero-inner {
  padding-top: clamp(54px, 8vw, 96px);
  padding-bottom: clamp(54px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(390px, .78fr);
  gap: clamp(38px, 7vw, 86px);
  align-items: center;
}

.tutorial-hero-copy,
.tutorial-signal,
.tutorial-copy {
  min-width: 0;
}

.tutorial-hero h1 {
  margin-top: 20px;
}

.tutorial-hero .lead {
  max-width: 33em;
  margin: 22px 0 0;
}

.tutorial-hero .button-row {
  margin-top: 28px;
}

.tutorial-facts {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tutorial-signal {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--color-console);
  color: var(--color-console-text);
}

.signal-head,
.signal-readout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-console-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .09em;
}

.signal-track {
  min-height: 248px;
  padding-block: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.signal-node {
  min-width: 46px;
  min-height: 46px;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-console-line);
  border-radius: var(--radius-xs);
  background: var(--color-console-raised);
  color: var(--color-console-muted);
  font-size: 11px;
  font-weight: 700;
}

.signal-node-active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-canvas);
}

.signal-line {
  width: clamp(12px, 2.2vw, 34px);
  height: 1px;
  flex: 1 1 auto;
  background: var(--color-console-line);
}

.signal-readout {
  padding-top: 14px;
  border-top: 1px solid var(--color-console-line);
}

.signal-readout span:first-child {
  color: var(--color-warning);
  font-weight: 800;
}

.tutorial-layout {
  padding-top: clamp(42px, 6vw, 72px);
  padding-bottom: clamp(72px, 10vw, 124px);
}

.tutorial-opening {
  max-width: var(--content-prose);
  margin: 0 0 clamp(54px, 8vw, 92px);
}

.tutorial-opening a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.tutorial-intro,
.tutorial-step {
  display: grid;
  grid-template-columns: minmax(110px, .28fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 72px);
}

.tutorial-intro {
  padding-bottom: clamp(64px, 9vw, 106px);
}

.tutorial-step {
  padding-top: clamp(68px, 9vw, 112px);
  padding-bottom: clamp(68px, 9vw, 112px);
  border-top: 1px solid var(--color-line);
}

.step-marker {
  align-self: start;
  padding-top: 9px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .1em;
  writing-mode: vertical-rl;
}

.tutorial-copy {
  max-width: var(--content-prose);
}

.tutorial-copy h2 {
  scroll-margin-top: var(--toc-offset);
}

.tutorial-copy h3 {
  font-size: 22px;
}

.tutorial-copy p {
  color: var(--color-muted);
}

.tutorial-copy strong {
  color: var(--color-ink);
}

.tutorial-copy a:not(.btn-primary):not(.btn-secondary) {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.step-action {
  margin-top: 30px;
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--color-line);
}

.step-action span {
  max-width: 34em;
  color: var(--color-muted);
  font-size: 13px;
}

.client-instructions {
  margin-top: 34px;
  display: grid;
  gap: 1px;
  border: 1px solid var(--color-line);
  background: var(--color-line);
}

.client-instruction {
  min-width: 0;
  padding: clamp(24px, 4vw, 36px);
  background: var(--color-panel);
}

.client-instruction h3 {
  margin-bottom: 16px;
}

.client-instruction p:last-child {
  margin-bottom: 0;
}

.client-code {
  margin-bottom: 10px;
  color: var(--color-accent-dark) !important;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .1em;
}

.verification-list {
  margin-top: 32px;
  border-top: 1px solid var(--color-line);
}

.verification-list > div {
  min-width: 0;
  padding-block: 18px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  border-bottom: 1px solid var(--color-line);
}

.verification-list p {
  margin: 0;
}

.verification-mark {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  background: var(--color-warning);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
}

@media (max-width: 900px) {
  .tutorial-hero-inner {
    grid-template-columns: 1fr;
  }

  .tutorial-signal {
    max-width: 680px;
  }
}

@media (max-width: 720px) {
  .tutorial-intro,
  .tutorial-step {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .step-marker {
    padding-top: 0;
    writing-mode: horizontal-tb;
  }

  .signal-track {
    min-height: 190px;
  }

  .signal-node {
    min-width: 40px;
    min-height: 40px;
    font-size: 10px;
  }
}

@media (max-width: 520px) {
  .tutorial-signal {
    padding: 16px;
  }

  .signal-track {
    min-height: 154px;
  }

  .signal-node {
    min-width: 32px;
    min-height: 36px;
    font-size: 9px;
  }

  .signal-line {
    min-width: 5px;
  }

  .signal-readout span:last-child {
    max-width: 18em;
    text-align: right;
  }

  .step-action,
  .step-action .btn-primary,
  .step-action .btn-secondary {
    width: 100%;
  }
}