.tutorial-hero {
  position: relative;
  overflow-x: clip;
  padding-top: 72px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.tutorial-hero::before {
  position: absolute;
  top: 0;
  right: 0;
  width: 34%;
  height: 100%;
  border-left: 1px solid var(--color-border);
  background: var(--color-panel-strong);
  content: "";
  pointer-events: none;
}

.tutorial-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, .78fr);
  align-items: center;
  gap: 72px;
}

.tutorial-hero-copy {
  min-width: 0;
}

.tutorial-hero-copy .section-kicker {
  margin-top: 24px;
}

.tutorial-hero-copy h1 {
  max-width: 760px;
  margin-bottom: 22px;
}

.tutorial-hero-lede {
  max-width: 690px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.75;
}

.tutorial-hero-copy .button-row {
  margin-top: 28px;
}

.tutorial-flow {
  position: relative;
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
}

.tutorial-flow::before {
  position: absolute;
  inset: 12px -12px -12px 12px;
  z-index: -1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  content: "";
}

.flow-head {
  display: flex;
  min-height: 46px;
  align-items: center;
  gap: 9px;
  padding-inline: 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-muted);
  font: 11px/1.4 var(--font-mono);
}

.flow-head span:last-child {
  margin-left: auto;
  color: var(--color-text);
  font-weight: 700;
}

.flow-track {
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-track li {
  position: relative;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  min-height: 68px;
  padding: 12px 18px;
}

.flow-track li + li {
  border-top: 1px solid var(--color-border);
}

.flow-track li:not(:last-child)::after {
  position: absolute;
  bottom: -8px;
  left: 36px;
  z-index: 2;
  width: 1px;
  height: 16px;
  background: var(--color-accent);
  content: "";
}

.flow-mark {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-muted);
  font: 750 13px/1 var(--font-mono);
}

.flow-mark.is-current {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-bg);
}

.flow-track b,
.flow-track small {
  display: block;
}

.flow-track b {
  color: var(--color-text);
  font: 700 11px/1.4 var(--font-mono);
  letter-spacing: .06em;
}

.flow-track small {
  margin-top: 3px;
  color: var(--color-muted);
  font-size: 13px;
}

.tutorial-document {
  width: 100%;
  max-width: calc(var(--reading-max) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.tutorial-document .toc-tabs {
  margin-inline: calc(var(--gutter) * -1);
  padding-inline: var(--gutter);
}

.tutorial-section {
  padding-top: 76px;
  padding-bottom: 76px;
}

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

.step-heading {
  margin-bottom: 26px;
}

.step-label {
  display: block;
  margin-bottom: 8px;
  color: var(--color-accent-dark);
  font: 700 11px/1.4 var(--font-mono);
  letter-spacing: .09em;
}

.step-heading h2 {
  margin-bottom: 0;
}

.tutorial-section > p,
.platform-guide p,
.completion-panel p {
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.82;
}

.tutorial-section a:not(.button) {
  color: var(--color-accent-dark);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.step-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.step-result {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 9px;
  color: var(--color-muted);
  font-size: 13px;
}

.platform-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 32px;
  margin-bottom: 30px;
}

.platform-guide {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
}

.platform-guide:nth-child(2),
.platform-guide:nth-child(3) {
  background: var(--color-panel);
}

.platform-guide-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.platform-guide-head .platform-icon {
  margin-bottom: 0;
}

.platform-guide-head h3 {
  margin-bottom: 0;
  font-size: 21px;
}

.platform-tag {
  display: block;
  margin-bottom: 3px;
  color: var(--color-accent-dark);
  font: 650 10px/1.4 var(--font-mono);
  letter-spacing: .08em;
}

.platform-guide p {
  margin-bottom: 14px;
  font-size: 14px;
}

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

.completion-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 30px;
  margin-top: 42px;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.completion-panel h3 {
  margin-bottom: 8px;
}

.completion-panel p {
  max-width: 560px;
  margin-bottom: 0;
  font-size: 14px;
}

@media (max-width: 1024px) {
  .tutorial-hero::before {
    width: 28%;
  }

  .tutorial-hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(320px, .72fr);
    gap: 42px;
  }
}

@media (max-width: 820px) {
  .tutorial-hero {
    padding-top: 56px;
    padding-bottom: 64px;
  }

  .tutorial-hero::before {
    top: auto;
    bottom: 0;
    width: 100%;
    height: 34%;
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .tutorial-hero-grid {
    grid-template-columns: 1fr;
  }

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

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

  .completion-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .tutorial-hero {
    padding-top: 42px;
    padding-bottom: 52px;
  }

  .tutorial-hero-lede {
    font-size: 16px;
  }

  .tutorial-flow::before {
    inset: 8px -8px -8px 8px;
  }

  .flow-track li {
    min-height: 62px;
    padding: 10px 14px;
  }

  .flow-track li:not(:last-child)::after {
    left: 32px;
  }

  .tutorial-section {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .tutorial-section > p {
    font-size: 15px;
  }

  .platform-guide {
    padding: 20px;
  }

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

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

  .completion-panel {
    padding: 22px;
  }

  .completion-panel .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .completion-panel .button {
    width: 100%;
  }
}