.tutorial-main {
  overflow-x: clip;
}

.tutorial-hero {
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: clamp(54px, 7vw, 92px);
  border-bottom: 1px solid var(--color-border);
}

.tutorial-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: clamp(44px, 7vw, 104px);
  align-items: end;
}

.tutorial-heading h1 {
  max-width: 760px;
  margin-top: 24px;
}

.tutorial-intro {
  max-width: 720px;
  margin-top: 26px;
  color: var(--color-muted);
  font-size: 17px;
  line-height: 1.85;
}

.tutorial-heading .button-row {
  margin-top: 30px;
}

.tutorial-index {
  padding: 26px 0 0;
  border-top: 1px solid var(--color-accent);
}

.tutorial-index-label {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.09em;
}

.tutorial-index dl {
  margin: 18px 0 0;
}

.tutorial-index dl > div {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--color-border);
}

.tutorial-index dt {
  color: var(--color-text);
  font-size: 13px;
  font-weight: 500;
}

.tutorial-index dd {
  margin: 0;
  color: var(--color-muted);
  font-size: 13px;
}

.tutorial-flow {
  padding-top: 42px;
}

.tutorial-callout {
  max-width: var(--reading-max);
  margin: 0 0 34px;
}

.tutorial-flow > .toc-tabs {
  top: 10px;
  z-index: 48;
  margin-bottom: 32px;
}

.tutorial-content {
  max-width: 1060px;
}

.guide-stage {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  padding-top: clamp(64px, 8vw, 104px);
  padding-bottom: clamp(64px, 8vw, 104px);
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: calc(var(--toc-offset) + 32px);
}

.stage-rail {
  display: flex;
  min-height: 100%;
  flex-direction: column;
}

.stage-code {
  position: sticky;
  top: calc(var(--toc-offset) + 24px);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.stage-line {
  width: 1px;
  min-height: 80px;
  flex: 1 1 auto;
  margin: 20px 0 0 4px;
  background: var(--color-border);
}

.stage-copy {
  min-width: 0;
}

.stage-copy h2 {
  max-width: 740px;
  margin-bottom: 30px;
}

.stage-copy > p {
  max-width: 790px;
  margin-bottom: 20px;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.9;
}

.stage-copy a:not(.btn) {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 4px;
}

.stage-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-top: 32px;
}

.text-link {
  font-size: 14px;
  font-weight: 500;
  text-decoration: none !important;
}

.sample-link {
  max-width: 790px;
  margin: 24px 0;
  padding: 18px 20px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  color: var(--color-text);
  -webkit-overflow-scrolling: touch;
}

.sample-link code {
  white-space: nowrap;
}

.platform-guide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 34px;
  margin-top: 42px;
  border-top: 1px solid var(--color-border);
}

.platform-step {
  min-width: 0;
  padding: 34px 0 28px;
  border-bottom: 1px solid var(--color-border);
}

.platform-step-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.platform-step-head svg {
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  color: var(--color-text);
}

.platform-step h3 {
  font-size: 23px;
  font-weight: 500;
}

.platform-step p {
  color: var(--color-muted);
  font-size: 14.5px;
  line-height: 1.85;
}

.verify-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 900px;
  margin: 34px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.verify-strip > div {
  min-width: 0;
  padding: 26px 22px;
  border-right: 1px solid var(--color-border);
}

.verify-strip > div:first-child {
  padding-left: 0;
}

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

.verify-label,
.next-guide-label {
  display: block;
  margin-bottom: 12px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.verify-strip strong {
  display: block;
  color: var(--color-text);
  font-size: 14px;
}

.verify-strip p {
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 12.5px;
  line-height: 1.7;
}

.next-guide {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  max-width: 820px;
  margin-top: 40px;
  padding: clamp(26px, 4vw, 42px);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.next-guide h3 {
  font-size: 25px;
}

.next-guide p {
  max-width: 560px;
  margin: 12px 0 0;
  color: var(--color-muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .tutorial-hero-grid {
    grid-template-columns: 1fr;
  }

  .tutorial-index {
    max-width: 620px;
  }

  .guide-stage {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 30px;
  }

  .platform-guide {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .tutorial-hero {
    padding-top: 52px;
    padding-bottom: 56px;
  }

  .tutorial-intro {
    font-size: 15px;
  }

  .tutorial-flow {
    padding-top: 28px;
  }

  .tutorial-flow > .toc-tabs {
    top: 6px;
  }

  .guide-stage {
    grid-template-columns: 1fr;
    gap: 22px;
    padding-top: 68px;
    padding-bottom: 68px;
  }

  .stage-rail {
    min-height: 0;
  }

  .stage-code {
    position: static;
  }

  .stage-line {
    width: 64px;
    min-height: 1px;
    height: 1px;
    margin: 14px 0 0;
  }

  .stage-copy h2 {
    margin-bottom: 24px;
  }

  .stage-copy > p {
    font-size: 15px;
    line-height: 1.85;
  }

  .verify-strip {
    grid-template-columns: 1fr;
  }

  .verify-strip > div {
    padding: 22px 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

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

  .next-guide {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .tutorial-index dl > div {
    grid-template-columns: 64px 1fr;
  }

  .stage-actions {
    align-items: stretch;
  }

  .stage-actions .btn {
    width: 100%;
  }

  .text-link {
    padding: 8px 2px;
  }

  .sample-link {
    padding: 16px;
  }
}