.tutorial-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border-soft);
  background:
    linear-gradient(180deg, var(--color-panel-raised), var(--color-bg)),
    var(--color-bg);
}

.tutorial-hero::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent);
}

.tutorial-hero::after {
  position: absolute;
  top: -230px;
  right: -170px;
  width: 560px;
  height: 560px;
  content: "";
  pointer-events: none;
  border: 1px solid var(--color-accent-line);
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-haze), var(--color-transparent) 68%);
}

.tutorial-hero-inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(72px, 10vw, 120px);
  padding-bottom: clamp(52px, 8vw, 88px);
}

.tutorial-hero h1 {
  max-width: 760px;
  margin-top: 22px;
  margin-bottom: 18px;
}

.tutorial-lead {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

.tutorial-actions {
  margin-top: 28px;
}

.tutorial-callout {
  max-width: 860px;
  margin-top: 36px;
  margin-bottom: 0;
}

.tutorial-toc-host {
  position: relative;
  z-index: 60;
  border-bottom: 1px solid var(--color-border-soft);
  background: var(--color-panel-raised);
}

.tutorial-toc-host .toc-tabs {
  margin-inline: 0;
  border-top: 0;
}

.tutorial-section {
  position: relative;
  border-bottom: 1px solid var(--color-border-soft);
}

.tutorial-section:nth-of-type(even) {
  background: var(--color-panel);
}

.tutorial-step {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: clamp(24px, 5vw, 58px);
}

.step-rail {
  min-height: 100%;
  display: flex;
  align-items: center;
  flex-direction: column;
}

.step-marker {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-accent-line);
  border-radius: var(--radius-none);
  color: var(--color-accent);
  background: var(--color-panel-raised);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 680;
}

.step-line {
  width: 1px;
  min-height: 80px;
  flex: 1;
  margin-top: 16px;
  background: linear-gradient(to bottom, var(--color-accent-line), var(--color-border-soft));
}

.step-content {
  max-width: 860px;
}

.step-content .section-kicker {
  margin-bottom: 18px;
}

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

.step-content p {
  color: var(--color-text-muted);
}

.step-content pre {
  margin-top: 22px;
  margin-bottom: 22px;
}

.step-action {
  margin-top: 32px;
  padding-top: 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  border-top: 1px solid var(--color-border-soft);
}

.step-action span {
  color: var(--color-text-dim);
  font-size: var(--text-sm);
}

.tutorial-platform-section {
  border-top: 1px solid var(--color-accent-line);
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(90deg, var(--color-panel-raised), var(--color-panel)),
    var(--color-panel);
}

.platform-intro {
  max-width: 860px;
  padding-left: 130px;
}

.platform-intro .section-kicker {
  margin-bottom: 18px;
}

.platform-intro h2 {
  margin-bottom: 18px;
}

.platform-intro p {
  color: var(--color-text-muted);
}

.platform-intro .button {
  margin-top: 10px;
}

.completion-panel {
  margin-top: 48px;
  padding: clamp(24px, 5vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 32px;
  border: 1px solid var(--color-accent-line);
  background: var(--color-panel-raised);
}

.completion-panel .badge {
  margin-bottom: 18px;
}

.completion-panel h3 {
  margin-bottom: 12px;
}

.completion-panel p {
  max-width: 640px;
  margin-bottom: 0;
}

.completion-panel .button-row {
  justify-content: flex-end;
}

@media (max-width: 768px) {
  .tutorial-hero::after {
    top: -180px;
    right: -260px;
  }

  .tutorial-hero-inner {
    padding-top: 64px;
    padding-bottom: 56px;
  }

  .tutorial-lead {
    font-size: var(--text-md);
  }

  .tutorial-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .step-rail {
    min-height: 0;
    align-items: center;
    flex-direction: row;
  }

  .step-line {
    width: auto;
    min-width: 72px;
    min-height: 1px;
    height: 1px;
    margin-top: 0;
    margin-left: 14px;
    background: linear-gradient(to right, var(--color-accent-line), var(--color-border-soft));
  }

  .platform-intro {
    padding-left: 0;
  }

  .completion-panel {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .completion-panel .button-row {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .tutorial-hero::after {
    display: none;
  }

  .tutorial-callout {
    padding-right: 18px;
  }

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

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

  .completion-panel .button-row {
    width: 100%;
  }

  .completion-panel .button {
    width: 100%;
  }
}