:root {
  --tutorial-hero-min: 520px;
  --tutorial-hero-gap: 72px;
  --tutorial-hero-pad: 86px;
  --tutorial-copy-width: 680px;
  --tutorial-route-width: 360px;
  --tutorial-route-pad: 30px;
  --tutorial-content-gap: 44px;
  --tutorial-article-width: 860px;
  --tutorial-step-space: 78px;
  --tutorial-card-gap: 18px;
  --tutorial-card-pad: 24px;
  --tutorial-rule-width: 58px;
  --tutorial-toc-top: 10px;
  --tutorial-mobile-pad: 54px;
  --tutorial-small-pad: 22px;
}

.tutorial-hero {
  min-height: var(--tutorial-hero-min);
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at top right, var(--color-panel-alt), var(--color-transparent) 42%),
    var(--color-bg);
}

.tutorial-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, var(--tutorial-copy-width)) minmax(280px, var(--tutorial-route-width));
  align-items: center;
  justify-content: space-between;
  gap: var(--tutorial-hero-gap);
  padding-top: var(--tutorial-hero-pad);
  padding-bottom: var(--tutorial-hero-pad);
}

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

.tutorial-hero-copy .badge {
  margin-bottom: 20px;
}

.tutorial-hero-copy h1 {
  max-width: var(--tutorial-copy-width);
}

.tutorial-hero-copy .lead {
  margin-bottom: 30px;
}

.tutorial-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 26px;
  border-top: 1px dashed var(--color-border);
  padding-top: 18px;
  color: var(--color-muted);
  font: 650 12px/1.6 var(--font-mono);
}

.tutorial-facts span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tutorial-facts span::before {
  color: var(--color-accent);
  content: "●";
}

.route-checklist {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  padding: var(--tutorial-route-pad);
  box-shadow: var(--shadow-raised);
  transform: rotate(1deg);
}

.route-checklist::before {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 46px;
  height: 46px;
  border: 2px double var(--color-accent);
  border-radius: var(--radius-pill);
  content: "";
  opacity: 0.24;
}

.route-checklist-label {
  margin-bottom: 20px;
  color: var(--color-accent);
  font: 750 11px/1.4 var(--font-mono);
  letter-spacing: 0.14em;
}

.route-checklist ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: route-card;
}

.route-checklist li {
  position: relative;
  display: grid;
  min-height: 60px;
  grid-template-columns: minmax(72px, 0.35fr) minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  border-bottom: 1px dashed var(--color-border);
  padding-left: 28px;
  counter-increment: route-card;
}

.route-checklist li::before {
  position: absolute;
  left: 0;
  color: var(--color-accent);
  content: counter(route-card);
  font: 800 12px var(--font-mono);
}

.route-checklist li span {
  color: var(--color-muted);
  font-size: 13px;
}

.route-checklist li strong {
  min-width: 0;
  font-size: 14px;
}

.route-checklist-note {
  margin: 18px 0 0;
  color: var(--color-muted);
  font-size: 12px;
}

.tutorial-content {
  position: relative;
  padding-top: var(--tutorial-content-gap);
  padding-bottom: var(--section-space);
}

.tutorial-content .toc-tabs {
  top: var(--tutorial-toc-top);
  margin-bottom: 54px;
}

.tutorial-article {
  width: 100%;
  max-width: var(--tutorial-article-width);
  margin-inline: auto;
}

.tutorial-intro {
  margin-bottom: var(--tutorial-step-space);
}

.guide-step {
  position: relative;
  border-top: 1px dashed var(--color-border);
  padding-top: var(--tutorial-step-space);
  padding-bottom: 6px;
}

.guide-step + .guide-step {
  margin-top: var(--tutorial-step-space);
}

.guide-step::before {
  position: absolute;
  top: -1px;
  left: 0;
  width: var(--tutorial-rule-width);
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.guide-step h2 {
  margin-top: 0;
}

.step-label,
.platform-guide-label,
.code-caption {
  color: var(--color-accent);
  font: 750 11px/1.5 var(--font-mono);
  letter-spacing: 0.13em;
}

.step-label {
  margin-bottom: 12px;
}

.step-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.next-step {
  margin-top: 30px;
  border-left: 3px solid var(--color-accent);
  padding-left: 18px;
  color: var(--color-muted);
  font-weight: 700;
}

.code-caption {
  margin-bottom: 8px;
}

.platform-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--tutorial-card-gap);
  margin-top: 34px;
  margin-bottom: 34px;
}

.platform-guide {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  padding: var(--tutorial-card-pad);
  box-shadow: var(--shadow-card);
}

.platform-guide h3 {
  margin-top: 8px;
  font-size: 22px;
}

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

.completion-list {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  padding: 0;
  list-style: none;
}

.completion-list li {
  position: relative;
  margin: 0;
  border-bottom: 1px dashed var(--color-border);
  padding: 11px 0 11px 30px;
}

.completion-list li::before {
  position: absolute;
  top: 11px;
  left: 0;
  color: var(--color-success);
  content: "✓";
  font-weight: 900;
}

@media (max-width: 900px) {
  .tutorial-hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
  }

  .route-checklist {
    width: 100%;
    max-width: 620px;
    transform: none;
  }
}

@media (max-width: 768px) {
  .tutorial-hero {
    min-height: auto;
  }

  .tutorial-hero-inner {
    padding-top: var(--tutorial-mobile-pad);
    padding-bottom: var(--tutorial-mobile-pad);
  }

  .tutorial-content .toc-tabs {
    margin-bottom: 42px;
  }

  .tutorial-intro {
    margin-bottom: 56px;
  }

  .guide-step {
    padding-top: 56px;
  }

  .guide-step + .guide-step {
    margin-top: 56px;
  }

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

@media (max-width: 640px) {
  .route-checklist {
    padding: var(--tutorial-small-pad);
  }

  .route-checklist li {
    grid-template-columns: minmax(64px, 0.35fr) minmax(0, 1fr);
  }

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

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

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

  .platform-guide {
    padding: var(--tutorial-small-pad);
  }
}