.tutorial-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(90deg, transparent, var(--color-accent-soft), transparent),
    var(--color-page);
}

.tutorial-hero::after {
  content: "";
  position: absolute;
  right: max(var(--gutter), calc((100% - var(--content-width)) / 2));
  bottom: -72px;
  width: 210px;
  height: 210px;
  border: 1px solid var(--color-accent);
  border-radius: 50%;
  box-shadow:
    0 0 0 28px var(--color-accent-glow),
    0 0 0 66px var(--color-grid);
  pointer-events: none;
}

.tutorial-hero .reading-wrap {
  position: relative;
  z-index: 1;
  margin-left: max(0px, calc((100% - var(--content-width)) / 2));
}

.tutorial-intro {
  max-width: 720px;
}

.tutorial-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.tutorial-facts li {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.tutorial-main {
  position: relative;
}

.tutorial-main > .toc-tabs {
  margin-bottom: 46px;
}

.tutorial-article {
  max-width: calc(var(--reading-width) + (var(--gutter) * 2));
}

.tutorial-step {
  position: relative;
  margin-top: 74px;
  padding-top: 34px;
  border-top: 1px solid var(--color-border);
}

.tutorial-step:first-of-type {
  margin-top: 48px;
}

.tutorial-port,
.platform-system {
  margin-bottom: 13px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.tutorial-step > h2 {
  max-width: 15ch;
}

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

.tutorial-step > p strong,
.platform-manual-item p strong {
  color: var(--color-ink);
}

.tutorial-text-link {
  color: var(--color-accent-dark);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 0.18em;
}

.tutorial-text-link:hover {
  color: var(--color-ink);
}

.tutorial-action {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  margin-top: 30px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: 0 14px 34px var(--color-soft-shadow);
}

.tutorial-action > div {
  display: grid;
  gap: 3px;
}

.tutorial-action strong {
  color: var(--color-ink);
}

.tutorial-action span {
  color: var(--color-muted);
  font-size: 13px;
}

.platform-manual {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-border);
}

.platform-manual-item {
  min-width: 0;
  padding: 28px;
  background: var(--color-surface);
}

.platform-manual-item h3 {
  font-size: 23px;
}

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

.verification-ledger {
  display: grid;
  margin: 30px 0;
  border-block: 1px solid var(--color-border);
}

.verification-ledger > div {
  display: grid;
  grid-template-columns: minmax(130px, 0.35fr) minmax(0, 1fr);
  gap: 22px;
  padding-top: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.verification-ledger > div:last-child {
  border-bottom: 0;
}

.verification-ledger strong {
  color: var(--color-ink);
}

.verification-ledger p {
  margin: 0;
  color: var(--color-muted);
}

.tutorial-next {
  padding: clamp(24px, 5vw, 46px);
  border: 1px solid var(--color-rack-edge);
  border-radius: var(--radius-md);
  background: var(--color-rack);
  box-shadow: var(--shadow-panel);
}

.tutorial-next h2 {
  color: var(--color-rack-copy);
}

.tutorial-next > p {
  color: var(--color-rack-muted);
}

.tutorial-next .tutorial-port {
  color: var(--color-accent);
}

.tutorial-next .button-row {
  margin-top: 28px;
}

@media (max-width: 768px) {
  .tutorial-hero::after {
    display: none;
  }

  .tutorial-hero .reading-wrap {
    margin-inline: auto;
  }

  .platform-manual {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 640px) {
  .tutorial-main > .toc-tabs {
    margin-bottom: 34px;
  }

  .tutorial-step {
    margin-top: 56px;
    padding-top: 28px;
  }

  .platform-manual-item {
    padding: 22px 18px;
  }

  .verification-ledger > div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .tutorial-next {
    padding: 22px 18px;
  }
}