.tutorial-hero {
  position: relative;
  max-width: 100%;
  overflow-x: clip;
  padding-top: 88px;
  padding-bottom: 80px;
  background: linear-gradient(180deg, var(--color-bg-top), var(--color-bg-bottom));
}

.tutorial-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, var(--color-text), transparent);
}

.tutorial-hero::after {
  position: absolute;
  top: -30%;
  right: 20%;
  left: 20%;
  height: 92%;
  pointer-events: none;
  background: radial-gradient(closest-side, var(--color-glow), transparent);
  content: "";
}

.tutorial-hero-inner {
  position: relative;
  z-index: 1;
}

.tutorial-heading {
  display: flex;
  max-width: 860px;
  margin-inline: auto;
  align-items: center;
  flex-direction: column;
  text-align: center;
}

.tutorial-heading h1 {
  margin-top: 22px;
}

.tutorial-heading > p {
  max-width: 720px;
  margin: 20px 0 0;
  color: var(--color-muted);
  font-size: 18px;
}

.tutorial-facts {
  display: grid;
  width: 100%;
  max-width: 820px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 34px 0 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft), inset 0 1px 0 var(--color-highlight);
  list-style: none;
}

.tutorial-facts li {
  min-width: 0;
  padding: 18px 20px;
}

.tutorial-facts li + li {
  border-left: 1px solid var(--color-border);
}

.tutorial-facts strong,
.tutorial-facts span {
  display: block;
}

.tutorial-facts strong {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
}

.tutorial-facts span {
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 12px;
}

.tutorial-manual {
  max-width: 980px;
  padding-top: 64px;
  padding-bottom: 112px;
  counter-reset: guide-step;
}

.tutorial-manual .toc-tabs {
  margin-bottom: 36px;
}

.tutorial-intro {
  display: grid;
  gap: 24px;
  margin-bottom: 44px;
}

.tutorial-intro > p {
  margin: 0;
  font-size: 17px;
}

.guide-step {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  counter-increment: guide-step;
  border-top: 1px solid var(--color-border);
}

.step-rail {
  position: relative;
  padding-top: 52px;
  border-right: 1px solid var(--color-border);
}

.step-rail::before {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-small);
  color: var(--color-text);
  background: var(--color-accent);
  content: counter(guide-step);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  box-shadow: var(--shadow-soft);
}

.step-rail span {
  display: block;
  margin-top: 9px;
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .08em;
}

.guide-step-final .step-rail::before {
  content: "✓";
}

.step-content {
  min-width: 0;
  padding: 50px 0 72px 42px;
}

.step-kicker {
  margin: 0 0 8px;
  color: var(--color-faint);
  font-size: 11px;
  letter-spacing: .08em;
}

.step-content h2 {
  margin-bottom: 26px;
  font-size: clamp(30px, 4vw, 42px);
}

.step-content > p {
  margin-bottom: 20px;
  font-size: 16px;
}

.step-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.step-actions .btn {
  flex-shrink: 0;
  white-space: nowrap;
}

.step-result {
  margin-top: 30px;
  padding: 20px 22px;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: inset 0 1px 0 var(--color-highlight);
}

.step-result strong {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 12px;
}

.step-result p {
  margin: 7px 0 0;
  color: var(--color-muted);
}

.platform-guides {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.platform-guide {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft), inset 0 1px 0 var(--color-highlight);
}

.platform-guide-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.platform-guide-head > svg {
  width: 28px;
  height: 28px;
  color: var(--color-muted);
}

.platform-guide h3 {
  margin: 2px 0 0;
  font-size: 22px;
}

.platform-guide p {
  margin-bottom: 16px;
}

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

.platform-label {
  margin: 0;
  color: var(--color-faint);
  font-size: 10px;
  letter-spacing: .08em;
}

.verification-panel {
  margin-top: 30px;
  padding: 28px;
  border-radius: var(--radius-medium);
  color: var(--color-window-text);
  background: linear-gradient(145deg, var(--color-window-top), var(--color-window));
  box-shadow: var(--shadow-window);
}

.verification-panel h3 {
  color: var(--color-window-text);
  font-size: 22px;
}

.verification-panel ol {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
}

.verification-panel ol > li {
  color: var(--color-window-muted);
}

.verification-panel ol > li::before {
  color: var(--color-text);
  background: var(--color-accent);
}

@media (max-width: 768px) {
  .tutorial-hero {
    padding-top: 64px;
    padding-bottom: 58px;
  }

  .tutorial-heading > p {
    font-size: 16px;
  }

  .tutorial-facts {
    grid-template-columns: 1fr;
  }

  .tutorial-facts li + li {
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .tutorial-manual {
    padding-top: 44px;
    padding-bottom: 80px;
  }

  .guide-step {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .step-rail {
    padding-top: 42px;
  }

  .step-rail::before {
    width: 32px;
    height: 32px;
  }

  .step-content {
    padding: 40px 0 58px 22px;
  }

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

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .tutorial-heading .hero-actions {
    margin-top: 24px;
  }

  .tutorial-facts li {
    padding: 15px 16px;
  }

  .tutorial-manual {
    padding-top: 32px;
    padding-bottom: 64px;
  }

  .tutorial-manual .toc-tabs {
    margin-bottom: 28px;
  }

  .tutorial-intro {
    margin-bottom: 32px;
  }

  .guide-step {
    display: block;
  }

  .step-rail {
    display: flex;
    padding-top: 34px;
    align-items: center;
    gap: 9px;
    border-right: 0;
  }

  .step-rail span {
    margin-top: 0;
  }

  .step-content {
    padding: 14px 0 52px;
  }

  .step-content h2 {
    margin-bottom: 22px;
  }

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

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

  .platform-guide {
    padding: 18px;
  }

  .verification-panel {
    padding: 22px 18px;
  }
}