:root {
  --tutorial-reading-lead: 760px;
  --tutorial-step-indent: 58px;
  --tutorial-marker-size: 38px;
  --tutorial-card-gap: 16px;
}

.tutorial-hero {
  padding-top: clamp(58px, 9vw, 104px);
  padding-bottom: clamp(42px, 7vw, 76px);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  text-align: center;
}

.tutorial-hero h1 {
  margin-bottom: 18px;
}

.tutorial-lead {
  max-width: var(--tutorial-reading-lead);
  margin-right: auto;
  margin-bottom: 26px;
  margin-left: auto;
  color: var(--color-ink-muted);
  font-size: clamp(16px, 2vw, 19px);
}

.tutorial-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 34px;
}

.route-summary {
  display: flex;
  max-width: 780px;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-inline: auto;
}

.route-summary span {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 6px 13px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.route-summary span:not(:last-child)::after {
  margin-left: 10px;
  color: var(--color-accent);
  content: '→';
}

.tutorial-document {
  padding-top: clamp(36px, 6vw, 64px);
  padding-bottom: var(--section-space);
}

.tutorial-document > .callout:first-child {
  margin-top: 0;
  margin-bottom: 54px;
}

.tutorial-step {
  position: relative;
  padding-top: clamp(50px, 7vw, 76px);
  padding-left: var(--tutorial-step-indent);
  border-top: 1px solid var(--color-line);
}

.tutorial-step + .tutorial-step {
  margin-top: clamp(54px, 8vw, 86px);
}

.tutorial-step::before {
  position: absolute;
  top: clamp(58px, 8vw, 84px);
  bottom: 0;
  left: 18px;
  width: 1px;
  background: var(--color-line);
  content: '';
}

.tutorial-step:last-child::before {
  bottom: 24px;
}

.step-marker {
  position: absolute;
  top: clamp(48px, 7vw, 74px);
  left: 0;
  z-index: 1;
  display: grid;
  min-width: var(--tutorial-marker-size);
  min-height: var(--tutorial-marker-size);
  place-items: center;
  padding: 6px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xs);
  background: var(--color-canvas);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.15;
  text-align: center;
}

.tutorial-step h2 {
  margin-bottom: 24px;
}

.tutorial-step > p,
.platform-instruction p {
  color: var(--color-ink-muted);
}

.tutorial-step > p {
  font-size: 16px;
  line-height: 1.85;
}

.text-link,
.tutorial-step p a,
.callout a {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-soft);
  text-underline-offset: 3px;
}

.text-link:hover,
.tutorial-step p a:hover,
.callout a:hover {
  color: var(--color-accent-deep);
  text-decoration-color: var(--color-accent);
}

.step-action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
}

.platform-instructions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--tutorial-card-gap);
  margin-top: 32px;
  margin-bottom: 30px;
}

.platform-instruction {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.platform-instruction .mono-label {
  margin-bottom: 10px;
  color: var(--color-accent);
}

.platform-instruction h3 {
  font-size: 21px;
}

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

.verification-record {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-line);
}

.verification-record > div {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
}

.verification-record .mono-label {
  display: block;
  margin-bottom: 9px;
  color: var(--color-accent);
}

.verification-record strong {
  display: block;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.verification-record p {
  margin-bottom: 0;
  color: var(--color-ink-muted);
  font-size: 13px;
}

.next-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.next-links a {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 7px;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-canvas);
  transition: border-color var(--ease-standard), background var(--ease-standard), transform var(--ease-standard);
}

.next-links a:hover {
  border-color: var(--color-accent);
  background: var(--color-panel);
  transform: translateY(-2px);
}

.next-links .mono-label {
  color: var(--color-accent);
}

.next-links strong {
  color: var(--color-ink);
  font-size: 17px;
}

.next-links span:last-child {
  color: var(--color-ink-muted);
  font-size: 13px;
}

@media (max-width: 768px) {
  :root {
    --tutorial-step-indent: 48px;
  }

  .tutorial-hero {
    padding-top: 48px;
  }

  .route-summary span:not(:last-child)::after {
    display: none;
  }

  .platform-instructions,
  .verification-record,
  .next-links {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-step::before {
    left: 16px;
  }

  .verification-record {
    gap: 1px;
  }
}

@media (max-width: 640px) {
  :root {
    --tutorial-step-indent: 0;
  }

  .tutorial-actions {
    align-items: stretch;
  }

  .tutorial-actions .btn {
    flex: 1 1 140px;
  }

  .route-summary {
    align-items: stretch;
  }

  .route-summary span {
    flex: 1 1 130px;
    justify-content: center;
  }

  .tutorial-step {
    padding-left: 0;
  }

  .tutorial-step::before {
    display: none;
  }

  .step-marker {
    position: static;
    display: inline-grid;
    margin-bottom: 16px;
  }

  .platform-instruction {
    padding: 20px;
  }

  .step-action {
    align-items: stretch;
  }

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