.tutorial-hero {
  position: relative;
  padding-top: clamp(72px, 9vw, 120px);
  padding-bottom: clamp(56px, 7vw, 92px);
  overflow: hidden;
  text-align: center;
  background:
    radial-gradient(circle at 28% 18%, var(--color-glow), var(--color-transparent) 34%),
    linear-gradient(180deg, var(--color-bg-deep), var(--color-bg));
}

.tutorial-hero::before,
.tutorial-hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.tutorial-hero::before {
  top: 18%;
  left: 50%;
  width: min(860px, 88vw);
  height: 1px;
  background: linear-gradient(90deg, var(--color-transparent), var(--color-accent-dark), var(--color-transparent));
  transform: translateX(-50%);
}

.tutorial-hero::after {
  right: 8%;
  bottom: -180px;
  width: 420px;
  height: 420px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-pill);
}

.tutorial-hero .wrap-narrow {
  position: relative;
  z-index: 1;
}

.tutorial-hero h1 {
  margin: 22px auto 0;
}

.tutorial-lead {
  max-width: 680px;
  margin: 20px auto 0;
  font-size: clamp(17px, 2vw, 20px);
}

.tutorial-actions {
  justify-content: center;
  margin-top: 28px;
}

.tutorial-actions .button {
  min-width: 150px;
}

.tutorial-facts {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 26px;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.tutorial-facts span {
  position: relative;
}

.tutorial-facts span:not(:last-child)::after {
  content: "·";
  position: absolute;
  right: -13px;
  color: var(--color-accent-dark);
}

.tutorial-guide {
  background:
    linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px);
  background-size: 64px 64px;
}

.tutorial-intro {
  max-width: 800px;
  margin: 0 auto clamp(52px, 7vw, 86px);
}

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

.tutorial-intro a,
.guide-step a:not(.button) {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dark);
  text-underline-offset: 0.18em;
}

.tutorial-flow {
  position: relative;
  width: 100%;
  max-width: 940px;
  margin-inline: auto;
}

.tutorial-flow::before {
  content: "";
  position: absolute;
  top: 32px;
  bottom: 32px;
  left: 55px;
  width: 1px;
  background: linear-gradient(var(--color-accent-dark), var(--color-border), var(--color-transparent));
}

.guide-step {
  position: relative;
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: clamp(26px, 5vw, 58px);
  padding-bottom: clamp(76px, 9vw, 122px);
}

.guide-step:last-child {
  padding-bottom: 0;
}

.step-marker {
  position: sticky;
  top: calc(var(--toc-top) + 76px);
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  align-self: start;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  background: var(--color-bg-deep);
  box-shadow: var(--shadow-card), inset 0 0 24px var(--color-glow-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.step-content {
  min-width: 0;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(145deg, var(--color-highlight), var(--color-transparent)),
    var(--color-panel);
  box-shadow: var(--shadow-card), var(--shadow-inset);
}

.step-heading {
  padding-bottom: 22px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.step-heading h2 {
  margin: 14px 0 0;
  font-size: clamp(30px, 4vw, 46px);
}

.step-content > p {
  font-size: 1.02rem;
}

.step-actions {
  margin-top: 28px;
}

.platform-walkthrough {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.platform-step {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-deep);
  box-shadow: var(--shadow-inset);
}

.platform-step-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.platform-step-head h3 {
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.7vw, 29px);
  font-weight: 500;
}

.platform-letter {
  width: 38px;
  height: 38px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  background: var(--color-highlight);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

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

.completion-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 30px;
  margin-top: 34px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 12% 0%, var(--color-glow), var(--color-transparent) 44%),
    var(--color-panel-raised);
}

.completion-panel h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 500;
}

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

.completion-panel .button-row {
  justify-content: flex-end;
}

@media (max-width: 768px) {
  .tutorial-hero {
    padding-top: 58px;
  }

  .tutorial-hero::after {
    display: none;
  }

  .tutorial-guide {
    background-size: 42px 42px;
  }

  .tutorial-flow::before {
    left: 27px;
  }

  .guide-step {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 16px;
  }

  .step-marker {
    top: calc(var(--toc-top) + 66px);
    width: 54px;
    height: 54px;
    font-size: 0.62rem;
  }

  .step-content {
    border-radius: var(--radius-lg);
  }

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

  .completion-panel .button-row {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .tutorial-facts {
    display: grid;
    gap: 6px;
  }

  .tutorial-facts span:not(:last-child)::after {
    display: none;
  }

  .tutorial-flow::before {
    display: none;
  }

  .guide-step {
    display: block;
    padding-bottom: 68px;
  }

  .step-marker {
    position: relative;
    top: auto;
    width: auto;
    height: 30px;
    display: inline-flex;
    padding-inline: 12px;
    margin: 0 0 -1px 16px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  }

  .step-content {
    padding: 22px 18px;
    border-radius: var(--radius-lg);
  }

  .step-heading h2 {
    font-size: clamp(28px, 8vw, 36px);
  }

  .platform-step {
    padding: 18px;
    border-radius: var(--radius-md);
  }

  .platform-step-head {
    align-items: flex-start;
  }

  .completion-panel {
    padding: 20px;
  }

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