.tutorial-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  color: var(--color-text);
}

.tutorial-hero::before {
  position: absolute;
  top: 0;
  right: 0;
  width: min(52vw, 760px);
  height: 100%;
  background:
    linear-gradient(90deg, var(--color-transparent), var(--color-canvas)),
    repeating-linear-gradient(
      90deg,
      var(--color-transparent) 0,
      var(--color-transparent) 28px,
      var(--color-line) 29px,
      var(--color-transparent) 30px
    );
  content: '';
  opacity: 0.5;
  pointer-events: none;
}

.tutorial-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 610px;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  gap: clamp(48px, 8vw, 120px);
  align-items: center;
  padding-top: clamp(80px, 10vw, 132px);
  padding-bottom: clamp(80px, 10vw, 132px);
}

.tutorial-hero-copy {
  max-width: 720px;
}

.tutorial-hero-copy h1 {
  max-width: 680px;
}

.tutorial-hero-copy .lead {
  margin-bottom: 30px;
}

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

.tutorial-sequence-item {
  display: grid;
  min-height: 90px;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-text);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.tutorial-sequence-item:hover {
  border-bottom-color: var(--color-accent-deep);
  background: var(--color-panel);
}

.tutorial-sequence-number {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
}

.tutorial-sequence-item strong,
.tutorial-sequence-item small {
  display: block;
}

.tutorial-sequence-item strong {
  margin-bottom: 4px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
}

.tutorial-sequence-item small {
  color: var(--color-text-soft);
  font-size: 13px;
}

.tutorial-intro {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: clamp(40px, 8vw, 112px);
  align-items: start;
  margin-top: 72px;
}

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

.tutorial-intro-copy a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-deep);
  text-underline-offset: 4px;
}

.tutorial-reading {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(48px, 8vw, 116px);
  align-items: start;
}

.step-heading {
  position: sticky;
  top: 94px;
}

.step-index {
  display: block;
  margin-bottom: 18px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.step-heading .lead {
  font-size: 17px;
}

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

.step-body > h3:first-child {
  margin-top: 0;
}

.mode-map {
  margin: 36px 0;
  border-top: 1px solid var(--color-line);
}

.mode-map-row {
  display: grid;
  min-height: 82px;
  grid-template-columns: minmax(110px, 0.32fr) minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  border-bottom: 1px solid var(--color-line);
}

.mode-map-row strong {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
}

.mode-map-row span {
  color: var(--color-text-soft);
  font-size: 14px;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
}

.check-item {
  min-width: 0;
  padding: clamp(24px, 4vw, 38px);
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
  color: var(--color-text);
}

.check-number {
  display: block;
  margin-bottom: 24px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.check-item h3 {
  font-size: 22px;
}

.check-item p {
  margin-bottom: 0;
  font-size: 14px;
}

@media (max-width: 900px) {
  .tutorial-hero-grid,
  .tutorial-reading,
  .tutorial-intro {
    grid-template-columns: minmax(0, 1fr);
  }

  .tutorial-hero-grid {
    min-height: 0;
  }

  .tutorial-sequence {
    max-width: 680px;
  }

  .tutorial-intro {
    margin-top: 56px;
  }

  .step-heading {
    position: static;
  }

  .step-heading .lead {
    max-width: 720px;
  }
}

@media (max-width: 640px) {
  .tutorial-hero::before {
    width: 100%;
    opacity: 0.34;
  }

  .tutorial-hero-grid {
    gap: 54px;
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .tutorial-sequence-item {
    min-height: 82px;
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 12px;
  }

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

  .mode-map-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    align-items: start;
    padding-top: 20px;
    padding-bottom: 20px;
  }

  .tutorial-intro,
  .tutorial-reading {
    gap: 38px;
  }
}