.tutorial-hero {
  border-bottom: var(--line-thin) solid var(--color-border);
  background-color: var(--color-bg);
}

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

.tutorial-hero::before {
  top: 0;
  right: 12%;
  bottom: 0;
  width: var(--line-thin);
  background: var(--color-text-faint);
}

.tutorial-hero::after {
  right: 0;
  bottom: var(--space-5);
  width: 38%;
  height: var(--line-medium);
  background: var(--color-accent-dark);
}

.tutorial-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  align-items: center;
  gap: var(--space-7);
}

.tutorial-intro {
  position: relative;
  z-index: 1;
  max-width: 790px;
}

.tutorial-intro .eyebrow {
  margin-bottom: var(--space-4);
}

.tutorial-intro h1 {
  max-width: 820px;
}

.tutorial-route-board {
  position: relative;
  padding: var(--space-5);
  border: var(--line-medium) solid var(--color-border);
  background: var(--color-panel);
}

.tutorial-route-board::before {
  position: absolute;
  top: -1px;
  right: var(--space-4);
  width: 72px;
  height: var(--line-heavy);
  content: "";
  background: var(--color-warn);
}

.route-list {
  position: relative;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  list-style: none;
}

.route-list::before {
  position: absolute;
  top: var(--space-4);
  bottom: var(--space-4);
  left: 20px;
  width: var(--line-medium);
  content: "";
  background: var(--color-accent-dark);
}

.route-list li {
  position: relative;
  min-height: 78px;
  padding: var(--space-3) 0 var(--space-3) 58px;
  display: flex;
  align-items: center;
  border-bottom: var(--line-thin) solid var(--color-text-faint);
}

.route-list li:last-child {
  border-bottom: 0;
}

.route-index {
  position: absolute;
  left: 0;
  z-index: 1;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: var(--line-medium) solid var(--color-accent);
  background: var(--color-bg);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
}

.route-list strong,
.route-list small {
  display: block;
}

.route-list strong {
  color: var(--color-text);
  font-size: 16px;
}

.route-list small {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: var(--tracking-wide);
}

.section-heading {
  margin-bottom: var(--space-5);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.75fr);
  align-items: end;
  gap: var(--space-6);
}

.section-heading .eyebrow {
  margin-bottom: var(--space-3);
}

.section-heading h2,
.section-heading p {
  margin-bottom: 0;
}

.section-heading p {
  padding-left: var(--space-4);
  border-left: var(--line-heavy) solid var(--color-accent-dark);
  color: var(--color-text-muted);
}

.platform-notes {
  margin-top: var(--space-5);
}

.platform-notes .tab-panel h3 {
  font-size: 24px;
}

.platform-notes .tab-panel p {
  max-width: 900px;
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.tutorial-step {
  position: relative;
}

.tutorial-step::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--gutter);
  width: var(--line-thin);
  content: "";
  background: var(--color-text-faint);
}

.step-header {
  position: relative;
  margin-bottom: var(--space-5);
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  align-items: center;
  gap: var(--space-4);
}

.step-number {
  position: relative;
  z-index: 1;
  width: 86px;
  height: 86px;
  display: grid;
  place-items: center;
  border: var(--line-heavy) solid var(--color-accent);
  background: var(--color-bg);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
}

.step-header .ref-label {
  margin-bottom: var(--space-2);
}

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

.step-lead {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  border-top: var(--line-thin) solid var(--color-border);
  border-right: var(--line-thin) solid var(--color-border);
  border-bottom: var(--line-thin) solid var(--color-border);
  border-left: var(--line-heavy) solid var(--color-accent-dark);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 18px;
}

.tutorial-step > p,
.tutorial-step > h3,
.tutorial-step > .callout,
.tutorial-step > .mode-matrix {
  margin-left: calc(86px + var(--space-4));
}

.tutorial-step > p {
  color: var(--color-text-muted);
}

.tutorial-step > h3 {
  margin-top: var(--space-5);
  padding-bottom: var(--space-2);
  border-bottom: var(--line-thin) solid var(--color-border);
}

.tutorial-step a,
.text-link {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.mode-matrix {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.mode-matrix .card h3 {
  font-size: 21px;
}

.mode-matrix .card p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.completion-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(420px, 1.2fr);
  gap: var(--space-7);
  align-items: start;
}

.completion-grid .eyebrow {
  margin-bottom: var(--space-3);
}

.check-list {
  margin: 0;
  padding: 0;
  display: grid;
  border-top: var(--line-thin) solid var(--color-border);
  list-style: none;
  counter-reset: completion;
}

.check-list li {
  position: relative;
  min-height: 68px;
  padding: var(--space-3) var(--space-3) var(--space-3) 62px;
  border-right: var(--line-thin) solid var(--color-border);
  border-bottom: var(--line-thin) solid var(--color-border);
  border-left: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-text-muted);
  counter-increment: completion;
}

.check-list li::before {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  content: counter(completion, decimal-leading-zero);
  border: var(--line-thin) solid var(--color-success);
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 9px;
}

.check-list strong {
  color: var(--color-text);
}

.next-links {
  margin-top: var(--space-7);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.next-links .panel {
  display: flex;
  flex-direction: column;
}

.next-links .panel p {
  color: var(--color-text-muted);
}

.next-links .text-link {
  margin-top: auto;
  padding-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 12px;
}

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

  .tutorial-route-board {
    max-width: 620px;
  }

  .section-heading {
    gap: var(--space-4);
  }

  .mode-matrix {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .tutorial-hero-grid {
    gap: var(--space-5);
  }

  .tutorial-route-board {
    padding: var(--space-4);
  }

  .step-header {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: var(--space-3);
  }

  .step-number {
    width: 58px;
    height: 58px;
    border-width: var(--line-medium);
    font-size: 17px;
  }

  .step-header .ref-label {
    font-size: 9px;
  }

  .tutorial-step > p,
  .tutorial-step > h3,
  .tutorial-step > .callout,
  .tutorial-step > .mode-matrix {
    margin-left: 0;
  }

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

  .step-lead {
    font-size: 16px;
  }

  .completion-grid {
    gap: var(--space-5);
  }

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