.tutorial-hero {
  position: relative;
  overflow-x: clip;
  background:
    linear-gradient(180deg, var(--color-bg-deep), var(--color-bg)),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.tutorial-hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image:
    linear-gradient(var(--color-grid-line) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, var(--color-transparent) 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, var(--color-text), var(--color-transparent));
  pointer-events: none;
}

.tutorial-hero .reading-wrap {
  position: relative;
  z-index: 1;
  padding-top: clamp(44px, 7vw, 86px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.tutorial-hero h1 {
  max-width: 760px;
  margin-top: 20px;
  margin-bottom: 20px;
}

.tutorial-hero .lead {
  margin-bottom: 0;
}

.tutorial-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 28px;
}

.tutorial-facts {
  margin-top: 34px;
}

.tutorial-document {
  padding-top: clamp(42px, 6vw, 76px);
}

.tutorial-guide {
  position: relative;
  min-width: 0;
}

.tutorial-guide > .toc-tabs {
  width: min(100%, 920px);
  margin-right: auto;
  margin-bottom: clamp(42px, 6vw, 72px);
  margin-left: auto;
}

.tutorial-intro {
  margin-bottom: clamp(64px, 8vw, 104px);
}

.tutorial-intro > p:last-child {
  margin-bottom: 0;
}

.tutorial-flow {
  width: min(100%, 980px);
  margin-inline: auto;
}

.tutorial-step {
  position: relative;
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: clamp(22px, 4vw, 54px);
  padding-bottom: clamp(72px, 9vw, 122px);
  scroll-margin-top: var(--toc-offset);
}

.tutorial-step:not(:last-child)::before {
  position: absolute;
  top: 74px;
  bottom: 18px;
  left: 51px;
  width: 1px;
  content: "";
  background: linear-gradient(var(--color-accent-line), var(--color-border), var(--color-transparent));
}

.step-marker {
  position: sticky;
  top: var(--toc-offset);
  display: flex;
  width: 104px;
  height: 74px;
  padding: 12px 14px;
  align-self: start;
  flex-direction: column;
  justify-content: center;
  color: var(--color-accent-soft);
  background:
    linear-gradient(135deg, var(--color-accent-glass), var(--color-transparent)),
    var(--color-panel);
  border: 1px solid var(--color-accent-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.step-marker span {
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
}

.step-marker strong {
  color: var(--color-accent-soft);
  font-family: var(--font-mono);
  font-size: 25px;
  line-height: 1.1;
}

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

.step-content h2 {
  max-width: 720px;
}

.step-content > p {
  max-width: 760px;
}

.step-action {
  display: flex;
  min-width: 0;
  margin-top: 28px;
  padding: 18px;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  background: var(--color-panel-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.step-action > span {
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
}

.text-link {
  color: var(--color-accent-soft);
  font-size: 14px;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 0.25em;
}

.platform-instructions {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.platform-instruction {
  min-width: 0;
  padding: clamp(22px, 4vw, 34px);
  background:
    linear-gradient(120deg, var(--color-white-faint), var(--color-transparent)),
    var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  scroll-margin-top: var(--toc-offset);
}

.platform-instruction:nth-child(even) {
  margin-left: clamp(0px, 5vw, 56px);
  background:
    linear-gradient(120deg, var(--color-accent-glass), var(--color-transparent)),
    var(--color-panel-soft);
}

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

.platform-heading {
  display: flex;
  margin-bottom: 18px;
  align-items: center;
  gap: 13px;
}

.platform-heading h3 {
  margin-bottom: 0;
}

.platform-heading .route-type {
  flex: 0 0 auto;
}

.step-content .callout a {
  color: var(--color-accent-soft);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 0.2em;
}

.verification-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
}

.verification-list > div {
  min-width: 0;
  padding: 18px;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.verification-list strong,
.verification-list span {
  display: block;
}

.verification-list strong {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
}

.verification-list strong::before {
  position: absolute;
  top: 0.55em;
  left: 1px;
  width: 8px;
  height: 5px;
  content: "";
  border-bottom: 1px solid var(--color-success);
  border-left: 1px solid var(--color-success);
  transform: rotate(-45deg);
}

.verification-list span {
  margin-top: 7px;
  color: var(--color-text-muted);
  font-size: 13px;
}

.tutorial-next {
  margin-top: 8px;
  padding-top: clamp(36px, 6vw, 68px);
  border-top: 1px solid var(--color-border);
}

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

.next-links {
  display: grid;
  gap: 10px;
  margin-top: 30px;
}

.next-links a {
  position: relative;
  display: grid;
  min-width: 0;
  padding: 19px 54px 19px 20px;
  gap: 3px;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    color var(--duration-fast) ease,
    background-color var(--duration-fast) ease,
    border-color var(--duration-fast) ease,
    transform var(--duration-fast) ease;
}

.next-links a::after {
  position: absolute;
  top: 50%;
  right: 21px;
  color: var(--color-accent);
  content: "→";
  font-family: var(--font-mono);
  transform: translateY(-50%);
}

.next-links a:hover {
  background: var(--color-panel-raised);
  border-color: var(--color-border-bright);
  transform: translateX(3px);
}

.next-links strong {
  font-size: 15px;
}

.next-links span {
  color: var(--color-text-muted);
  font-size: 13px;
}

@media (max-width: 768px) {
  .tutorial-step {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 18px;
  }

  .tutorial-step:not(:last-child)::before {
    top: 58px;
    left: 33px;
  }

  .step-marker {
    top: var(--toc-offset);
    width: 68px;
    height: 58px;
    padding: 8px 10px;
  }

  .step-marker strong {
    font-size: 20px;
  }

  .platform-instruction:nth-child(even) {
    margin-left: 0;
  }

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

@media (max-width: 560px) {
  .tutorial-hero-actions .button {
    width: 100%;
  }

  .tutorial-step {
    display: block;
  }

  .tutorial-step:not(:last-child)::before {
    display: none;
  }

  .step-marker {
    position: static;
    width: 76px;
    height: 54px;
    margin-bottom: 22px;
  }

  .step-action {
    align-items: stretch;
    flex-direction: column;
  }

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

  .platform-instruction {
    padding: 20px;
  }

  .platform-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 9px;
  }
}