.tutorial-hero {
  min-height: 720px;
  display: flex;
  align-items: center;
  border-bottom: var(--line-medium) solid var(--color-border-bright);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--color-grid-minor) var(--line-thin), var(--color-transparent) var(--line-thin)),
    linear-gradient(90deg, var(--color-grid-minor) var(--line-thin), var(--color-transparent) var(--line-thin)),
    linear-gradient(135deg, var(--color-panel-soft), var(--color-transparent));
  background-size: 24px 24px, 24px 24px, 100% 100%;
}

.tutorial-hero::before {
  position: absolute;
  top: 0;
  right: 12%;
  bottom: 0;
  width: var(--line-thin);
  content: "";
  background: var(--color-grid-focus);
}

.tutorial-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.72fr);
  gap: var(--space-7);
  align-items: center;
}

.tutorial-intro {
  position: relative;
  z-index: 2;
}

.tutorial-intro h1 {
  max-width: 820px;
}

.tutorial-intro .button-row {
  margin-bottom: var(--space-5);
}

.tutorial-lead {
  max-width: 680px;
  padding-left: var(--space-3);
  border-left: var(--line-heavy) solid var(--color-accent);
  font-size: 1.05rem;
}

.tutorial-intro .chip-row {
  margin-top: var(--space-4);
}

.tutorial-route {
  position: relative;
  padding: var(--space-4);
}

.tutorial-route::before {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 44px;
  height: 44px;
  content: "";
  border-top: var(--line-medium) solid var(--color-success);
  border-right: var(--line-medium) solid var(--color-success);
}

.route-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding-bottom: var(--space-3);
  border-bottom: var(--line-thin) solid var(--color-border);
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
}

.route-list {
  position: relative;
  display: grid;
  gap: 0;
  margin: var(--space-3) 0;
  padding: 0;
  list-style: none;
}

.route-list::before {
  position: absolute;
  top: 28px;
  bottom: 28px;
  left: 24px;
  width: var(--line-thin);
  content: "";
  background: var(--color-success);
}

.route-list li {
  position: relative;
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: center;
  min-height: 88px;
  margin: 0;
  border-bottom: var(--line-thin) solid var(--color-border);
}

.route-list li:last-child {
  border-bottom: 0;
}

.route-index {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 50px;
  height: 34px;
  border: var(--line-medium) solid var(--color-success);
  color: var(--color-success);
  background: var(--color-panel-2);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.route-list strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.route-list small {
  display: block;
  margin-top: 4px;
}

.route-foot {
  margin: 0;
  padding-top: var(--space-3);
  border-top: var(--line-thin) solid var(--color-border);
  color: var(--color-border-bright);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
}

.tutorial-prose h2 {
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}

.tutorial-prose > h2:first-of-type {
  margin-top: 0;
}

.step-heading {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-5);
}

.step-heading h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.step-number {
  display: grid;
  place-items: center;
  width: 82px;
  height: 82px;
  border: var(--line-heavy) solid var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-soft);
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 800;
}

.setup-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.setup-facts > div {
  padding: var(--space-3);
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.setup-facts strong {
  display: block;
  margin: var(--space-2) 0;
}

.setup-facts p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.setup-label,
.verify-code {
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

.checkpoint {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: center;
  margin-top: var(--space-5);
  padding: var(--space-3);
  border: var(--line-thin) solid var(--color-success);
  background: var(--color-success-soft);
}

.checkpoint p {
  margin: 0;
}

.checkpoint-complete {
  border-width: var(--line-medium);
}

.mode-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: var(--space-5) 0;
  border: var(--line-thin) solid var(--color-border);
}

.mode-strip article {
  min-width: 0;
  padding: var(--space-3);
  border-right: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.mode-strip article:first-child {
  background: var(--color-accent-soft);
}

.mode-strip article:last-child {
  border-right: 0;
}

.mode-strip h3 {
  margin-top: var(--space-3);
}

.mode-strip p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.verify-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-5) 0;
}

.verify-grid article {
  position: relative;
  padding: var(--space-3);
  border: var(--line-thin) solid var(--color-border);
  background:
    linear-gradient(135deg, var(--color-success-soft), var(--color-transparent)),
    var(--color-panel);
}

.verify-grid article::after {
  position: absolute;
  top: -1px;
  right: -1px;
  width: 28px;
  height: 28px;
  content: "";
  border-bottom: var(--line-thin) solid var(--color-border);
  border-left: var(--line-thin) solid var(--color-border);
}

.verify-grid h3 {
  margin-top: var(--space-3);
}

.verify-grid p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.diagnosis-list {
  display: grid;
  gap: var(--space-2);
  padding-left: 0;
  list-style: none;
  counter-reset: diagnosis;
}

.diagnosis-list li {
  position: relative;
  min-height: 110px;
  padding: var(--space-3) var(--space-3) var(--space-3) 88px;
  border: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  counter-increment: diagnosis;
}

.diagnosis-list li::before {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  content: counter(diagnosis, decimal-leading-zero);
  border: var(--line-medium) solid var(--color-success);
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.diagnosis-list h3 {
  margin-top: 0;
  margin-bottom: var(--space-2);
}

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

.next-path {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: center;
  margin-top: var(--space-7);
  padding: var(--space-5);
}

.next-path h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.next-path p:last-child {
  margin-bottom: 0;
}

@media (max-width: 980px) {
  .tutorial-hero {
    min-height: 0;
  }

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

  .tutorial-route {
    max-width: 680px;
  }

  .setup-facts,
  .mode-strip,
  .verify-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .mode-strip article {
    border-right: 0;
    border-bottom: var(--line-thin) solid var(--color-border);
  }

  .mode-strip article:last-child {
    border-bottom: 0;
  }

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

@media (max-width: 640px) {
  .tutorial-hero {
    align-items: flex-start;
  }

  .tutorial-hero-grid {
    gap: var(--space-6);
  }

  .tutorial-lead {
    font-size: 1rem;
  }

  .tutorial-route {
    padding: var(--space-3);
  }

  .step-heading {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: var(--space-3);
  }

  .step-number {
    width: 58px;
    height: 58px;
    border-width: var(--line-medium);
    font-size: 1rem;
  }

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

  .diagnosis-list li {
    padding: 78px var(--space-3) var(--space-3);
  }

  .diagnosis-list li::before {
    top: var(--space-3);
    left: var(--space-3);
  }

  .next-path {
    padding: var(--space-3);
  }
}