.guide-hero {
  position: relative;
  padding-top: 72px;
  padding-bottom: 72px;
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-panel);
}

.guide-hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.32;
  content: "";
  pointer-events: none;
}

.guide-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr);
  align-items: center;
  gap: 64px;
}

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

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

.guide-hero-copy > .eyebrow {
  display: flex;
  margin-bottom: 16px;
}

.guide-hero-copy h1 {
  max-width: 720px;
  margin-bottom: 22px;
}

.guide-hero-copy .lead {
  max-width: 700px;
}

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

.guide-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.guide-facts span {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  padding-inline: 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.setup-board {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-md);
  background: var(--color-page);
  box-shadow: var(--shadow-card);
}

.setup-board::before {
  position: absolute;
  top: 43px;
  bottom: 66px;
  left: 37px;
  width: 2px;
  background: var(--color-accent);
  content: "";
}

.setup-board-head {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-inline: 18px;
  background: var(--color-ink);
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.setup-track {
  display: grid;
  padding: 16px 18px;
  list-style: none;
}

.setup-track li {
  position: relative;
  display: grid;
  grid-template-columns: 52px 78px minmax(0, 1fr);
  min-height: 58px;
  align-items: center;
  gap: 10px;
  padding-left: 28px;
  border-bottom: 1px solid var(--color-line);
}

.setup-track li:last-child {
  border-bottom: 0;
}

.setup-track li::before {
  position: absolute;
  left: 13px;
  z-index: 1;
  width: 9px;
  height: 9px;
  border: 2px solid var(--color-page);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
  content: "";
}

.setup-track span,
.setup-track small {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.setup-track strong {
  font-size: 14px;
}

.setup-board-note {
  padding: 16px 18px;
  border-top: 1px solid var(--color-line);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.7;
}

.tutorial-shell {
  padding-top: 32px;
  padding-bottom: 96px;
}

.tutorial-shell > .toc-tabs {
  top: 8px;
  margin-bottom: 18px;
}

.tutorial-section {
  padding-top: 70px;
  padding-bottom: 70px;
  border-bottom: 1px solid var(--color-line);
}

.tutorial-section-last {
  border-bottom: 0;
}

.step-heading {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  margin-bottom: 32px;
}

.step-heading .eyebrow {
  display: flex;
  margin-bottom: 9px;
}

.step-code {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  padding-inline: 12px;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-xs);
  background: var(--color-ink);
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.tutorial-copy {
  max-width: var(--reading-width);
  color: var(--color-ink);
  font-size: 17px;
  line-height: 1.9;
}

.tutorial-copy p + p {
  margin-top: 18px;
}

.tutorial-copy a {
  color: var(--color-accent-dark);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.tutorial-copy code {
  padding: 2px 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xs);
  background: var(--color-panel);
  color: var(--color-ink);
  font-size: 0.86em;
}

.tutorial-section > .callout {
  max-width: var(--reading-width);
  margin-bottom: 28px;
}

.tutorial-section > .callout p {
  margin-top: 5px;
  color: var(--color-muted);
  line-height: 1.75;
}

.instruction-panel {
  position: relative;
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 28px;
  padding: 34px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-page);
}

.instruction-panel::after {
  position: absolute;
  top: -1px;
  right: 34px;
  width: 64px;
  height: 3px;
  background: var(--color-accent);
  content: "";
}

.instruction-index {
  color: var(--color-panel-strong);
  font-family: var(--font-mono);
  font-size: 58px;
  font-weight: 900;
  line-height: 1;
}

.inline-action {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.inline-action p {
  margin-top: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.6;
}

.platform-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.platform-guide {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-page);
}

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

.platform-guide-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-line);
}

.platform-guide-head p {
  margin-bottom: 3px;
  color: var(--color-muted);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.platform-guide-head h3 {
  font-size: 24px;
}

.platform-mark {
  display: inline-flex;
  width: 54px;
  height: 54px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.platform-guide .tutorial-copy {
  font-size: 15px;
  line-height: 1.85;
}

.verification-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 28px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-page);
}

.verification-strip > div {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--color-line);
}

.verification-strip > div:last-child {
  border-right: 0;
}

.verification-strip span {
  display: block;
  margin-bottom: 18px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.verification-strip strong {
  display: block;
  margin-bottom: 7px;
}

.verification-strip p {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.65;
}

.tutorial-summary {
  position: relative;
  padding: 32px;
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
}

@media (max-width: 900px) {
  .guide-hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 44px;
  }

  .setup-board {
    max-width: 680px;
  }

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

@media (max-width: 700px) {
  .guide-hero {
    padding-top: 52px;
    padding-bottom: 52px;
  }

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

  .tutorial-shell {
    padding-top: 0;
    padding-bottom: 72px;
  }

  .tutorial-shell > .toc-tabs {
    top: 0;
    margin-inline: calc(var(--gutter) * -1);
    margin-bottom: 0;
  }

  .tutorial-section {
    padding-top: 54px;
    padding-bottom: 54px;
  }

  .step-heading {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .step-code {
    width: fit-content;
  }

  .instruction-panel {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    padding: 24px;
  }

  .instruction-index {
    font-size: 38px;
  }

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

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

  .verification-strip > div {
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }

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

@media (max-width: 480px) {
  .setup-board::before {
    left: 31px;
  }

  .setup-track {
    padding-inline: 12px;
  }

  .setup-track li {
    grid-template-columns: 45px minmax(0, 1fr);
    gap: 8px;
    padding-left: 24px;
  }

  .setup-track li::before {
    left: 13px;
  }

  .setup-track small {
    grid-column: 2;
    padding-bottom: 9px;
  }

  .platform-guide {
    padding: 21px;
  }

  .platform-guide-head {
    align-items: flex-start;
  }

  .tutorial-copy {
    font-size: 16px;
  }

  .tutorial-summary {
    padding: 24px;
  }
}