:root {
  --tutorial-hero-gap: clamp(36px, 6vw, 88px);
  --tutorial-copy-width: 45rem;
  --tutorial-visual-width: 34rem;
  --tutorial-step-line: 2px;
  --tutorial-icon-size: 42px;
  --tutorial-reading-width: 58rem;
}

.tutorial-shell {
  position: relative;
}

.tutorial-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr);
  gap: var(--tutorial-hero-gap);
  align-items: center;
  min-height: calc(100svh - var(--header-height));
  padding-top: clamp(56px, 8vw, 104px);
  padding-bottom: clamp(64px, 8vw, 110px);
}

.tutorial-hero-copy {
  max-width: var(--tutorial-copy-width);
}

.tutorial-hero h1 {
  margin-top: 1.25rem;
  margin-bottom: 1.2rem;
}

.tutorial-lead {
  max-width: 43rem;
  margin-bottom: 1.6rem;
  color: var(--color-muted);
  font-size: clamp(1.04rem, 1.5vw, 1.22rem);
  line-height: 1.8;
}

.tutorial-specimen {
  width: 100%;
  max-width: var(--tutorial-visual-width);
  justify-self: end;
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.tutorial-specimen svg {
  width: 100%;
  color: var(--color-accent);
}

.tutorial-specimen .mono-note {
  margin: .85rem 0 0;
  text-align: right;
}

.specimen-stop {
  fill: var(--color-page);
  stroke: var(--color-accent);
  stroke-width: 3;
}

.specimen-bird {
  color: var(--color-accent);
}

.specimen-belly {
  fill: var(--color-page);
}

.specimen-wing {
  fill: var(--color-apricot);
  stroke: var(--color-accent-dark);
  stroke-width: 2;
  stroke-linejoin: round;
}

.specimen-beak {
  fill: var(--color-yellow);
  stroke: var(--color-accent-dark);
  stroke-width: 2;
  stroke-linejoin: round;
}

.specimen-eye {
  fill: var(--color-ink);
}

.specimen-bag {
  fill: var(--color-panel-strong);
  stroke: var(--color-ink);
  stroke-width: 2;
}

.specimen-strap,
.specimen-lock {
  fill: none;
  stroke: var(--color-ink);
  stroke-width: 2;
}

.specimen-route {
  animation: tutorial-route-flow 12s linear infinite;
}

.specimen-bird {
  animation: tutorial-bird-float 4.8s var(--ease-standard) infinite alternate;
}

@keyframes tutorial-route-flow {
  to {
    stroke-dashoffset: -68;
  }
}

@keyframes tutorial-bird-float {
  to {
    transform: translate(275px, 113px);
  }
}

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

.tutorial-body > .toc-tabs {
  margin-bottom: clamp(40px, 7vw, 76px);
}

.tutorial-reading {
  width: 100%;
  max-width: var(--tutorial-reading-width);
  margin-inline: auto;
}

.tutorial-reading a:not(.btn-primary):not(.btn-secondary) {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}

.guide-section {
  position: relative;
  padding-top: clamp(62px, 9vw, 104px);
  padding-bottom: clamp(62px, 9vw, 104px);
  border-bottom: 1px solid var(--color-line);
}

.guide-section:first-of-type {
  padding-top: clamp(40px, 6vw, 72px);
}

.guide-section:last-child {
  border-bottom: 0;
}

.guide-section h2 {
  max-width: 48rem;
}

.guide-section > p,
.platform-note p {
  color: var(--color-muted);
}

.section-index {
  display: inline-flex;
  margin-bottom: 1rem;
  align-items: center;
  gap: .65rem;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .11em;
}

.section-index::before {
  width: 38px;
  height: var(--tutorial-step-line);
  background: var(--color-accent);
  content: "";
}

.step-action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.25rem;
  margin-top: 2rem;
  padding-top: 1.4rem;
  border-top: 1px dashed var(--color-line);
}

.platform-notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.platform-note {
  min-width: 0;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-page);
}

.platform-note:nth-child(even) {
  background: var(--color-panel);
}

.platform-note-heading {
  display: flex;
  align-items: center;
  gap: .85rem;
  margin-bottom: 1rem;
}

.platform-note-heading h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.08rem;
}

.platform-mini-icon {
  display: inline-grid;
  width: var(--tutorial-icon-size);
  height: var(--tutorial-icon-size);
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--color-apricot-deep);
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}

.platform-mini-icon svg {
  width: 24px;
  height: 24px;
}

.next-reading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: center;
  margin-top: 2.5rem;
  background: var(--color-panel);
}

.next-reading h3 {
  margin-bottom: .45rem;
}

.next-reading p:last-child {
  margin-bottom: 0;
}

.next-reading .btn-secondary {
  white-space: nowrap;
}

@media (max-width: 980px) {
  .tutorial-hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .tutorial-specimen {
    max-width: 42rem;
    justify-self: start;
  }

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

@media (max-width: 700px) {
  .tutorial-hero {
    padding-top: 48px;
    padding-bottom: 64px;
  }

  .tutorial-specimen {
    padding: 14px;
  }

  .tutorial-body > .toc-tabs {
    margin-inline: calc(var(--gutter) * -1);
    width: calc(100% + (var(--gutter) * 2));
    max-width: none;
  }

  .guide-section {
    padding-top: 58px;
    padding-bottom: 58px;
  }

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

  .step-action .btn-primary,
  .step-action .btn-secondary {
    width: 100%;
  }

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

  .next-reading .btn-secondary {
    width: 100%;
    white-space: normal;
  }
}

@media (max-width: 420px) {
  .tutorial-specimen .mono-note {
    text-align: left;
  }

  .platform-note {
    padding: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .specimen-route,
  .specimen-bird {
    animation: none;
  }
}