:root {
  --tutorial-reading-width: 940px;
  --tutorial-marker-size: 18px;
  --tutorial-icon-size: 52px;
  --tutorial-line-width: 2px;
  --tutorial-route-width: 360px;
}

.tutorial-hero {
  position: relative;
  isolation: isolate;
}

.tutorial-hero::before {
  position: absolute;
  z-index: -1;
  top: 8%;
  right: 6%;
  width: min(540px, 48vw);
  height: min(540px, 48vw);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-pill);
  background:
    radial-gradient(circle at 45% 44%, var(--color-accent-faint), var(--color-transparent) 38%),
    radial-gradient(circle at 66% 62%, var(--color-navy-glow), var(--color-transparent) 58%);
  box-shadow:
    0 0 0 34px var(--color-grid),
    0 0 0 68px var(--color-grid);
  content: "";
}

.tutorial-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, var(--tutorial-route-width));
  align-items: center;
  gap: clamp(36px, 7vw, 92px);
}

.tutorial-hero-copy {
  max-width: 780px;
}

.tutorial-hero-copy h1 {
  margin-top: 20px;
}

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

.tutorial-route-map {
  position: relative;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(145deg, var(--color-glass-light), var(--color-transparent) 48%),
    var(--color-glass-strong);
  box-shadow: var(--shadow-window);
  backdrop-filter: blur(22px);
}

.tutorial-route-map::after {
  position: absolute;
  right: -58px;
  bottom: -72px;
  width: 180px;
  height: 180px;
  border: 1px solid var(--color-accent-faint);
  border-radius: var(--radius-pill);
  content: "";
}

.tutorial-route-head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  color: var(--color-text-dim);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.tutorial-route-list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0;
  margin: 24px 0;
  padding: 0;
  list-style: none;
}

.tutorial-route-list li {
  position: relative;
  display: flex;
  min-height: 42px;
  align-items: center;
  gap: 13px;
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.tutorial-route-list li:not(:last-child)::after {
  position: absolute;
  top: 30px;
  bottom: -12px;
  left: 8px;
  width: var(--tutorial-line-width);
  background: linear-gradient(var(--color-accent-dark), var(--color-border));
  content: "";
}

.tutorial-route-marker {
  position: relative;
  z-index: 1;
  width: var(--tutorial-marker-size);
  height: var(--tutorial-marker-size);
  flex: 0 0 auto;
  border: 4px solid var(--color-panel);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-dark), 0 0 14px var(--color-accent-glow);
}

.tutorial-facts {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border-soft);
}

.tutorial-shell {
  padding-bottom: var(--section-space);
}

.tutorial-shell > .callout {
  max-width: var(--tutorial-reading-width);
  margin-inline: auto;
}

.tutorial-shell > .toc-tabs {
  max-width: var(--tutorial-reading-width);
  margin-inline: auto;
}

.tutorial-flow {
  max-width: var(--tutorial-reading-width);
  margin-inline: auto;
}

.tutorial-chapter {
  position: relative;
  border-bottom: 1px solid var(--color-border-soft);
}

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

.tutorial-chapter-head {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-bottom: 30px;
}

.tutorial-step-label {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  justify-content: center;
  padding: 0 11px;
  border: 1px solid var(--color-accent-faint);
  border-radius: var(--radius-pill);
  color: var(--color-accent-light);
  background: var(--color-accent-faint);
  font-family: var(--font-mono);
  font-size: 11px;
  white-space: nowrap;
}

.tutorial-chapter-head .section-kicker {
  margin-bottom: 9px;
}

.tutorial-chapter-head h2 {
  margin-bottom: 0;
}

.tutorial-copy {
  padding-left: 116px;
}

.tutorial-copy > p {
  font-size: 17px;
  line-height: 1.88;
}

.tutorial-copy a:not(.button) {
  color: var(--color-accent-light);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dark);
  text-underline-offset: 0.2em;
}

.tutorial-action-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  margin-top: 28px;
  padding: 18px 20px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  background: var(--color-glass-light);
  box-shadow: inset 0 1px 0 var(--color-border-soft);
}

.tutorial-action-strip > div {
  display: grid;
  gap: 3px;
}

.tutorial-action-strip strong {
  font-size: 14px;
}

.tutorial-action-strip span {
  color: var(--color-text-muted);
  font-size: 13px;
}

.tutorial-example {
  margin: 28px 0;
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-md);
  background: var(--color-bg-deep);
  box-shadow: inset 0 1px 0 var(--color-border-soft);
}

.tutorial-example-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border-soft);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.tutorial-example pre {
  margin: 0;
  border: 0;
  border-radius: 0;
  background: var(--color-transparent);
  box-shadow: none;
}

.platform-manual-list {
  display: grid;
  margin: 34px 0;
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.platform-manual {
  display: grid;
  grid-template-columns: var(--tutorial-icon-size) minmax(0, 1fr);
  gap: 22px;
  padding: 26px;
}

.platform-manual + .platform-manual {
  border-top: 1px solid var(--color-border-soft);
}

.platform-manual-mark {
  display: grid;
  width: var(--tutorial-icon-size);
  height: var(--tutorial-icon-size);
  place-items: center;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  background:
    linear-gradient(145deg, var(--color-accent-faint), var(--color-transparent)),
    var(--color-panel-2);
  box-shadow: inset 0 1px 0 var(--color-border-soft);
}

.platform-manual-mark svg {
  width: 27px;
  height: 27px;
}

.platform-manual h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.platform-manual p {
  margin-bottom: 0.85em;
  font-size: 15px;
  line-height: 1.78;
}

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

.verification-board {
  display: grid;
  margin-top: 30px;
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(140deg, var(--color-success-faint), var(--color-transparent) 46%),
    var(--color-panel);
}

.verification-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 15px;
  padding: 20px 22px;
}

.verification-row + .verification-row {
  border-top: 1px solid var(--color-border-soft);
}

.verification-state {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-success);
  border-radius: var(--radius-pill);
  color: var(--color-success);
  background: var(--color-success-faint);
  font-family: var(--font-mono);
  font-size: 13px;
}

.verification-row strong {
  display: block;
  margin-bottom: 3px;
  font-size: 14px;
}

.verification-row p {
  margin-bottom: 0;
  font-size: 13px;
}

.tutorial-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 34px;
  margin-top: 38px;
  border-color: var(--color-accent-faint);
  background:
    radial-gradient(circle at 86% 18%, var(--color-accent-faint), var(--color-transparent) 34%),
    linear-gradient(145deg, var(--color-panel-2), var(--color-panel));
}

.tutorial-next h3 {
  margin-top: 14px;
}

.tutorial-next p {
  margin-bottom: 0;
}

.tutorial-next .button-row {
  flex-wrap: nowrap;
}

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

  .tutorial-route-map {
    width: min(100%, 620px);
  }

  .tutorial-copy {
    padding-left: 0;
  }

  .tutorial-next {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 640px) {
  .tutorial-hero::before {
    top: 22%;
    right: -36%;
    width: 100vw;
    height: 100vw;
  }

  .tutorial-route-map {
    padding: 20px;
    border-radius: var(--radius-lg);
  }

  .tutorial-chapter-head {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .tutorial-step-label {
    width: fit-content;
  }

  .tutorial-copy > p {
    font-size: 15px;
    line-height: 1.82;
  }

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

  .tutorial-action-strip .button {
    width: 100%;
  }

  .tutorial-example-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .platform-manual {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .platform-manual-mark {
    width: 46px;
    height: 46px;
  }

  .platform-manual h3 {
    font-size: 19px;
  }

  .verification-row {
    padding: 18px;
  }

  .tutorial-next .button-row {
    width: 100%;
    flex-direction: column;
  }
}