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

.tutorial-intro h1 {
  max-width: 11em;
}

.tutorial-summary {
  max-width: 42em;
  margin-top: 24px;
  color: var(--color-ink-soft);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.85;
}

.tutorial-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 28px;
}

.tutorial-facts span {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.tutorial-intro .callout {
  margin-top: 38px;
  margin-bottom: 0;
}

.tutorial-document {
  position: relative;
  padding-top: 28px;
  padding-bottom: var(--space-section);
}

.tutorial-document .toc-tabs {
  margin-bottom: 32px;
}

.tutorial-step {
  position: relative;
  padding-top: clamp(72px, 8vw, 112px);
  padding-bottom: clamp(72px, 8vw, 112px);
  border-bottom: 1px solid var(--color-line);
}

.tutorial-step:last-child {
  border-bottom: 0;
}

.step-marker,
.platform-code,
.verification-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.13em;
}

.step-marker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 17px;
}

.step-marker::after {
  width: 44px;
  border-top: 1px solid var(--color-accent);
  content: "";
}

.tutorial-step > h2 {
  max-width: 13em;
}

.tutorial-step > p,
.platform-instruction p {
  color: var(--color-ink-soft);
  font-size: 17px;
  line-height: 1.9;
}

.tutorial-step > p {
  max-width: 48em;
}

.tutorial-step > p a,
.platform-instruction p a {
  font-weight: 650;
}

.step-action {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  margin-top: 38px;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
}

.step-action strong {
  display: block;
  margin-bottom: 4px;
}

.step-action p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
  font-size: 14px;
}

.step-action .button {
  min-width: 156px;
}

.platform-instructions {
  display: grid;
  gap: 1px;
  margin-top: 42px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-line);
}

.platform-instruction {
  padding: clamp(28px, 5vw, 48px);
  background: var(--color-canvas);
}

.platform-instruction:nth-child(even) {
  background: var(--color-surface);
}

.platform-code {
  display: block;
  margin-bottom: 13px;
}

.platform-instruction h3 {
  font-family: var(--font-display);
  font-size: clamp(27px, 3vw, 36px);
  font-weight: 400;
}

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

.verification-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 40px;
  margin-bottom: 40px;
}

.verification-grid article {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
}

.verification-grid article:nth-child(2) {
  background: var(--color-surface-strong);
}

.verification-grid h3 {
  margin-top: 24px;
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 400;
}

.verification-grid p {
  margin-bottom: 0;
  color: var(--color-ink-soft);
  font-size: 14px;
}

.completion-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
  margin-top: 48px;
  padding: clamp(30px, 6vw, 58px);
  border-radius: var(--radius-large);
  background: linear-gradient(115deg, var(--color-encode-teal), var(--color-encode-amber));
  color: var(--color-white);
}

.completion-panel .section-kicker,
.completion-panel h2,
.completion-panel p {
  color: var(--color-white);
}

.completion-panel .section-kicker::before {
  background: var(--color-white);
}

.completion-panel h2 {
  margin-bottom: 10px;
}

.completion-panel p {
  max-width: 38em;
  margin-bottom: 0;
}

.completion-panel .button {
  background: var(--color-white);
  color: var(--color-ink);
}

.completion-panel .button:hover {
  color: var(--color-ink);
}

@media (max-width: 820px) {
  .step-action,
  .completion-panel {
    grid-template-columns: 1fr;
  }

  .step-action .button {
    width: 100%;
  }

  .verification-grid {
    grid-template-columns: 1fr;
  }

  .verification-grid article {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .tutorial-document {
    padding-top: 16px;
  }

  .tutorial-step {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .tutorial-step > p,
  .platform-instruction p {
    font-size: 16px;
  }

  .tutorial-facts {
    align-items: stretch;
    flex-direction: column;
  }

  .tutorial-facts span {
    width: 100%;
  }

  .step-action,
  .platform-instruction,
  .verification-grid article {
    padding: 20px;
  }

  .completion-panel {
    padding: 26px 20px;
  }
}