.tutorial-main {
  max-width: calc(var(--reading-width) + 180px + var(--gutter) * 2);
}

.tutorial-intro {
  max-width: var(--reading-width);
  padding-bottom: clamp(36px, 6vw, 64px);
}

.tutorial-intro .eyebrow {
  margin-bottom: 22px;
}

.tutorial-intro h1 {
  max-width: 780px;
}

.tutorial-lead {
  max-width: 760px;
  margin-bottom: 28px;
  color: var(--color-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.75;
}

.tutorial-platform-note {
  margin-top: 0;
  margin-bottom: 34px;
}

.tutorial-platform-note a:not(.platform-chip) {
  color: var(--color-brand-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-brand);
  text-underline-offset: 0.2em;
}

.tutorial-platform-note .platform-row {
  margin-top: 16px;
}

.tutorial-main > .toc {
  top: 12px;
}

.tutorial-step {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(64px, 8vw, 104px);
  padding-bottom: clamp(64px, 8vw, 104px);
  border-bottom: 1px solid var(--color-line);
}

.tutorial-step:last-child {
  border-bottom: 0;
}

.tutorial-step-marker {
  position: sticky;
  top: calc(var(--header-height) + 82px);
  display: inline-flex;
  width: 64px;
  height: 64px;
  align-items: center;
  justify-content: center;
  align-self: start;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--gradient-brand-accessible);
  color: var(--color-white-text);
  box-shadow: var(--shadow-card);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 750;
}

.tutorial-step-content {
  min-width: 0;
}

.tutorial-step-content > h2 {
  margin-bottom: 26px;
}

.tutorial-step-content > h3 {
  margin-top: 42px;
}

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

.tutorial-step-content a {
  color: var(--color-brand-deep);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: var(--color-brand);
  text-underline-offset: 0.2em;
}

.tutorial-check {
  margin: 30px 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 4vw, 30px);
  background: var(--color-panel);
}

.tutorial-check h3 {
  margin-bottom: 14px;
  font-size: 20px;
}

.tutorial-check ul {
  display: grid;
  gap: 9px;
  margin-bottom: 0;
  color: var(--color-muted);
}

.tutorial-interface {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: clip;
  margin: 30px 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-page);
  box-shadow: var(--shadow-card);
}

.tutorial-interface > div {
  min-width: 0;
  padding: 23px;
}

.tutorial-interface > div + div {
  border-left: 1px solid var(--color-line);
}

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

.tutorial-interface span {
  margin-bottom: 8px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.tutorial-interface strong {
  font-size: 15px;
  line-height: 1.55;
}

.tutorial-mode-grid,
.tutorial-verify-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 30px 0 38px;
}

.tutorial-mode-grid article,
.tutorial-verify-grid article {
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 22px;
  background: var(--color-page);
  box-shadow: var(--shadow-card);
}

.tutorial-mode-grid article:first-child {
  background: var(--color-panel);
}

.tutorial-mode-grid h3,
.tutorial-verify-grid h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.tutorial-mode-grid p,
.tutorial-verify-grid p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.tutorial-mode-label,
.tutorial-verify-grid article > span {
  display: inline-flex;
  max-width: 100%;
  min-height: 27px;
  align-items: center;
  overflow: hidden;
  margin-bottom: 13px;
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  background: var(--color-warning-soft);
  color: var(--color-brand-deep);
  font-size: 12px;
  font-weight: 750;
}

.tutorial-verify-grid article > span {
  background: var(--color-success-soft);
  color: var(--color-ink);
}

.tutorial-setting-panel {
  overflow: clip;
  margin: 30px 0 40px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.tutorial-setting-row {
  display: flex;
  min-height: 82px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
}

.tutorial-setting-row + .tutorial-setting-row {
  border-top: 1px solid var(--color-line);
}

.tutorial-setting-row div {
  min-width: 0;
}

.tutorial-setting-row strong,
.tutorial-setting-row div span {
  display: block;
}

.tutorial-setting-row div span {
  margin-top: 3px;
  color: var(--color-muted);
  font-size: 13px;
}

.tutorial-state {
  display: inline-flex;
  max-width: 100%;
  min-height: 30px;
  flex: 0 0 auto;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 4px 11px;
  background: var(--color-page);
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 750;
}

.tutorial-state-on {
  border-color: var(--color-brand-deep);
  background: var(--color-brand-deep);
  color: var(--color-white-text);
}

.tutorial-diagnosis {
  display: grid;
  gap: 16px;
  margin: 32px 0;
  padding: 0;
  list-style: none;
  counter-reset: diagnosis;
}

.tutorial-diagnosis li {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 24px 24px 24px 76px;
  background: var(--color-page);
  box-shadow: var(--shadow-card);
  counter-increment: diagnosis;
}

.tutorial-diagnosis li::before {
  position: absolute;
  top: 24px;
  left: 22px;
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-panel-strong);
  color: var(--color-brand-deep);
  content: counter(diagnosis);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
}

.tutorial-diagnosis h3 {
  margin-bottom: 7px;
  font-size: 19px;
}

.tutorial-diagnosis p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.tutorial-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  margin-top: 42px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);
  padding: clamp(24px, 4vw, 36px);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.tutorial-next h3 {
  margin-bottom: 7px;
  font-size: 22px;
}

.tutorial-next p {
  margin-bottom: 0;
  color: var(--color-muted);
}

@media (max-width: 860px) {
  .tutorial-main > .toc {
    top: 8px;
  }

  .tutorial-step {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
  }

  .tutorial-step-marker {
    position: static;
    width: 54px;
    height: 54px;
    border-radius: var(--radius-md);
    font-size: 13px;
  }

  .tutorial-interface,
  .tutorial-mode-grid,
  .tutorial-verify-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-interface > div + div {
    border-top: 1px solid var(--color-line);
    border-left: 0;
  }

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

@media (max-width: 640px) {
  .tutorial-intro {
    padding-bottom: 44px;
  }

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

  .tutorial-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .tutorial-step-marker {
    width: auto;
    min-width: 50px;
    height: 34px;
    justify-self: start;
    border-radius: var(--radius-pill);
    padding: 4px 13px;
  }

  .tutorial-step-content > h2 {
    margin-bottom: 20px;
  }

  .tutorial-step-content > h3 {
    margin-top: 34px;
  }

  .tutorial-interface > div,
  .tutorial-mode-grid article,
  .tutorial-verify-grid article {
    padding: 19px;
  }

  .tutorial-setting-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding: 18px;
  }

  .tutorial-diagnosis li {
    padding: 68px 19px 21px;
  }

  .tutorial-diagnosis li::before {
    top: 18px;
    left: 19px;
  }

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