.tutorial-hero {
  padding-top: clamp(64px, 9vw, 118px);
  padding-bottom: clamp(52px, 7vw, 92px);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.tutorial-hero-copy {
  max-width: 900px;
}

.tutorial-hero h1 {
  max-width: 760px;
  margin-top: 20px;
}

.tutorial-hero .lead {
  max-width: 780px;
  margin-bottom: 28px;
}

.tutorial-actions,
.tutorial-facts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.tutorial-actions {
  margin-bottom: 22px;
}

.tutorial-document {
  padding-bottom: clamp(72px, 9vw, 126px);
}

.tutorial-reading {
  max-width: 980px;
  margin-inline: auto;
}

.guide-step {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 34px;
  padding-top: clamp(58px, 8vw, 96px);
  padding-bottom: clamp(58px, 8vw, 96px);
  border-bottom: 1px solid var(--color-border);
}

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

.guide-step-mark {
  position: sticky;
  top: var(--toc-offset);
  align-self: start;
  display: grid;
  gap: 5px;
  padding: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.guide-step-mark span {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.guide-step-mark strong {
  color: var(--color-accent-dark);
  font-size: 16px;
  font-weight: 650;
}

.guide-step-body {
  min-width: 0;
}

.guide-step-body > h2 {
  margin-bottom: 26px;
}

.guide-step-body > p {
  line-height: 1.9;
}

.guide-action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 28px;
  padding: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.guide-action p {
  flex: 1 1 260px;
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.prose .guide-action .btn-main {
  color: var(--color-bg);
  text-decoration: none;
}

.platform-guide-list {
  display: grid;
  gap: 18px;
  margin-top: 42px;
}

.platform-guide {
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  scroll-margin-top: var(--toc-offset);
}

.platform-guide:nth-child(even) {
  background: var(--color-bg);
}

.platform-guide-label {
  margin-bottom: 10px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.platform-guide h3 {
  margin-bottom: 18px;
  font-size: clamp(22px, 3vw, 28px);
}

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

.tutorial-finish {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  margin-top: 38px;
  padding: clamp(24px, 5vw, 38px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel-strong);
}

.tutorial-finish h3 {
  margin-bottom: 10px;
}

.tutorial-finish p:last-child {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .guide-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .guide-step-mark {
    position: static;
    width: fit-content;
    min-width: 92px;
  }

  .tutorial-finish {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-finish .btn-sub {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: 52px;
    padding-bottom: 54px;
  }

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

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

  .guide-step {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .guide-action {
    align-items: stretch;
    flex-direction: column;
  }

  .guide-action .btn-main,
  .guide-action .btn-sub {
    width: 100%;
  }

  .platform-guide {
    padding: 22px 18px;
  }
}