.tutorial-page {
  max-width: var(--page-max);
}

.tutorial-heading {
  max-width: 840px;
}

.tutorial-facts {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tutorial-page > .callout {
  max-width: 1040px;
  margin-top: 0;
}

.tutorial-page > .callout a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-pale);
  text-underline-offset: 0.18em;
}

.tutorial-layout {
  display: grid;
  grid-template-columns: minmax(0, 860px) minmax(230px, 310px);
  justify-content: space-between;
  gap: clamp(36px, 6vw, 86px);
  align-items: start;
}

.tutorial-content,
.tutorial-rail {
  min-width: 0;
}

.tutorial-content > section {
  scroll-margin-top: calc(var(--header-height) + 76px);
}

.tutorial-intro,
.tutorial-step {
  padding-top: clamp(48px, 7vw, 82px);
  padding-bottom: clamp(48px, 7vw, 82px);
  border-bottom: var(--line-thin) solid var(--color-border);
}

.tutorial-intro {
  padding-top: 12px;
}

.tutorial-content h2 {
  max-width: 700px;
}

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

.tutorial-content strong {
  color: var(--color-text);
}

.tutorial-content a:not(.button) {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-pale);
  text-underline-offset: 0.18em;
}

.step-heading {
  margin-bottom: 30px;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.step-heading .plate-label {
  margin-bottom: 10px;
}

.step-number {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--color-paper);
  background: var(--color-accent);
  border: var(--line-thin) solid var(--color-accent-dark);
  border-radius: var(--radius-circle);
  font: 700 18px/1 var(--font-mono);
}

.preflight-strip {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  background: var(--color-border);
  border: var(--line-thin) solid var(--color-border);
  gap: 1px;
}

.preflight-strip > div {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
}

.preflight-index {
  width: 30px;
  height: 30px;
  margin-bottom: 16px;
  display: grid;
  place-items: center;
  color: var(--color-accent-dark);
  background: var(--color-accent-alpha);
  border: var(--line-thin) solid var(--color-accent-pale);
  border-radius: var(--radius-circle);
  font: 700 11px/1 var(--font-mono);
}

.preflight-strip strong {
  display: block;
  margin-bottom: 8px;
}

.preflight-strip p {
  margin: 0;
  font-size: 14px;
}

.instruction-panel,
.result-matrix {
  margin: 32px 0;
  padding: clamp(22px, 4vw, 34px);
  background: var(--color-panel);
  border: var(--line-thin) solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-small);
}

.instruction-panel h3,
.result-matrix h3 {
  font-family: var(--font-display);
}

.instruction-panel ol {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.mode-ledger {
  margin: 34px 0;
  border-top: var(--line-thin) solid var(--color-border);
}

.mode-row {
  min-width: 0;
  padding: 24px 0;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 22px;
  border-bottom: var(--line-thin) solid var(--color-border);
}

.mode-code {
  min-height: 34px;
  padding: 6px 10px;
  align-self: start;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-dark);
  background: var(--color-accent-alpha);
  border: var(--line-thin) solid var(--color-accent-pale);
  border-radius: var(--radius-pill);
  font: 700 10px/1 var(--font-mono);
  letter-spacing: 0.08em;
}

.mode-row h3 {
  margin-bottom: 5px;
  font-size: 20px;
}

.mode-row p {
  margin: 0;
}

.connection-sequence {
  position: relative;
  margin: 34px 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.connection-sequence::before {
  position: absolute;
  top: 25px;
  right: 12%;
  left: 12%;
  height: var(--line-thin);
  content: "";
  background: var(--color-web);
}

.connection-sequence > div {
  position: relative;
  min-width: 0;
  padding: 0 18px 22px;
  background: var(--color-panel);
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
}

.connection-sequence span {
  width: 48px;
  height: 48px;
  margin: -1px auto 18px;
  display: grid;
  place-items: center;
  color: var(--color-paper);
  background: var(--color-accent);
  border: var(--line-thin) solid var(--color-accent-dark);
  border-radius: var(--radius-circle);
  font: 700 12px/1 var(--font-mono);
}

.connection-sequence strong {
  display: block;
  text-align: center;
}

.connection-sequence p {
  margin: 8px 0 0;
  font-size: 13px;
  text-align: center;
}

.result-matrix .table-wrap {
  margin-top: 18px;
}

.diagnostic-list {
  margin: 34px 0;
  padding: 0;
  list-style: none;
  counter-reset: diagnostic;
}

.diagnostic-list li {
  position: relative;
  min-width: 0;
  padding: 0 0 28px 58px;
  counter-increment: diagnostic;
  border-left: var(--line-thin) solid var(--color-web-light);
}

.diagnostic-list li:last-child {
  padding-bottom: 0;
  border-left-color: var(--color-transparent);
}

.diagnostic-list li::before {
  position: absolute;
  top: 0;
  left: -19px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  content: counter(diagnostic);
  color: var(--color-accent-dark);
  background: var(--color-panel);
  border: var(--line-thin) solid var(--color-accent);
  border-radius: var(--radius-circle);
  font: 700 11px/1 var(--font-mono);
}

.diagnostic-list h3 {
  margin-bottom: 7px;
  font-size: 20px;
}

.diagnostic-list p {
  margin-bottom: 0;
}

.tutorial-next {
  padding-top: clamp(52px, 7vw, 82px);
  padding-bottom: 0;
}

.tutorial-next p {
  max-width: 720px;
}

.tutorial-next .button-row {
  margin-top: 26px;
}

.tutorial-rail {
  position: sticky;
  top: calc(var(--header-height) + 92px);
}

.tutorial-rail-panel {
  position: relative;
  padding: 25px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
}

.tutorial-rail-panel::after {
  position: absolute;
  top: 61px;
  bottom: 92px;
  left: 42px;
  width: var(--line-thin);
  content: "";
  background: var(--color-web-light);
}

.tutorial-rail-panel ol {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tutorial-rail-panel li {
  margin: 0;
}

.tutorial-rail-panel li + li {
  margin-top: 8px;
}

.tutorial-rail-panel a {
  min-width: 0;
  padding: 10px 0;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  column-gap: 12px;
  align-items: center;
}

.tutorial-rail-panel a > span {
  width: 36px;
  height: 36px;
  grid-row: span 2;
  display: grid;
  place-items: center;
  color: var(--accent-dark);
  background: var(--color-panel);
  border: var(--line-thin) solid var(--color-web);
  border-radius: var(--radius-circle);
  font: 700 9px/1 var(--font-mono);
}

.tutorial-rail-panel a:hover > span {
  color: var(--color-paper);
  background: var(--color-accent);
  border-color: var(--color-accent-dark);
}

.tutorial-rail-panel strong,
.tutorial-rail-panel small {
  min-width: 0;
}

.tutorial-rail-panel strong {
  font-size: 13px;
  line-height: 1.45;
}

.tutorial-rail-panel small {
  font: 9px/1.5 var(--font-mono);
  overflow-wrap: anywhere;
}

.rail-note {
  margin: 22px 0 0;
  padding-top: 18px;
  color: var(--color-text-muted);
  border-top: var(--line-thin) solid var(--color-border-soft);
  font: 10px/1.75 var(--font-mono);
}

@media (max-width: 1040px) {
  .tutorial-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-rail {
    display: none;
  }

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

@media (max-width: 720px) {
  .preflight-strip,
  .connection-sequence {
    grid-template-columns: 1fr;
  }

  .connection-sequence {
    gap: 12px;
  }

  .connection-sequence::before {
    top: 24px;
    right: auto;
    bottom: 24px;
    left: 24px;
    width: var(--line-thin);
    height: auto;
  }

  .connection-sequence > div {
    padding: 18px 18px 18px 72px;
  }

  .connection-sequence span {
    position: absolute;
    top: 14px;
    left: 0;
    margin: 0;
  }

  .connection-sequence strong,
  .connection-sequence p {
    text-align: left;
  }
}

@media (max-width: 640px) {
  .tutorial-heading {
    margin-bottom: 36px;
  }

  .step-heading {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 14px;
  }

  .step-number {
    width: 52px;
    height: 52px;
    font-size: 14px;
  }

  .mode-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .diagnostic-list li {
    padding-left: 44px;
  }

  .diagnostic-list li::before {
    left: -16px;
    width: 32px;
    height: 32px;
  }

  .instruction-panel,
  .result-matrix {
    padding: 20px;
  }
}