.guide-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
}

.guide-hero::before {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at top right, var(--color-glow-soft), transparent 54%),
    linear-gradient(180deg, var(--color-accent-faint), transparent 68%);
  content: "";
  pointer-events: none;
}

.guide-hero::after {
  position: absolute;
  right: -12%;
  bottom: -48%;
  width: min(56vw, 720px);
  aspect-ratio: 1;
  border: 1px solid var(--color-glow-ring);
  border-radius: var(--radius-pill);
  box-shadow:
    0 0 0 38px var(--color-accent-faint),
    0 0 0 76px var(--color-glow-halo);
  content: "";
  opacity: 0.72;
  pointer-events: none;
}

.guide-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: min(760px, calc(100svh - var(--header-height)));
  align-content: center;
  justify-items: start;
  padding-top: clamp(88px, 13vw, 166px);
  padding-bottom: clamp(88px, 13vw, 166px);
}

.guide-hero .hero-title {
  max-width: 800px;
  margin-top: 18px;
}

.guide-deck {
  max-width: 740px;
  margin-top: 24px;
  color: var(--color-text-muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.75;
}

.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.guide-hero .button-row {
  margin-top: 30px;
}

.guide-intro {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.guide-preface {
  font-size: 18px;
  line-height: 1.85;
}

.guide-preface .callout {
  margin-top: 34px;
}

.guide-document {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: var(--section-space);
}

.guide-document > .toc-tabs {
  margin-bottom: clamp(54px, 8vw, 92px);
}

.guide-prose {
  width: 100%;
  max-width: var(--reading-max);
  margin-inline: auto;
  font-size: 17px;
  line-height: 1.92;
}

.guide-prose > * + * {
  margin-top: 0;
}

.guide-chapter {
  padding-top: clamp(42px, 7vw, 82px);
  padding-bottom: clamp(68px, 10vw, 124px);
  border-top: 1px solid var(--color-border);
}

.guide-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.chapter-label {
  margin-bottom: 16px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
}

.guide-prose .guide-chapter h2 {
  margin-top: 0;
  margin-bottom: clamp(38px, 6vw, 64px);
}

.guide-prose .guide-chapter h3 {
  margin-top: 2.25em;
  margin-bottom: 0.72em;
  padding-top: 0.35em;
  font-family: var(--font-display);
  font-size: clamp(25px, 3vw, 32px);
}

.guide-prose .guide-chapter h3::before {
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 12px;
  vertical-align: 0.28em;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-glow-ring);
  content: "";
}

.guide-prose .guide-chapter p + p {
  margin-top: 1.05em;
}

.guide-prose .callout,
.guide-prose .table-scroll,
.guide-prose pre {
  margin-top: 34px;
  margin-bottom: 34px;
}

.guide-prose .table-scroll {
  max-width: 100%;
}

.guide-prose .compare-table,
.guide-prose .route-table {
  min-width: 760px;
}

.guide-prose pre {
  font-size: 14px;
  line-height: 1.75;
}

.guide-prose pre code {
  color: var(--color-text-muted);
}

.guide-prose a {
  font-weight: 600;
}

@media (max-width: 768px) {
  .guide-hero::after {
    right: -44%;
    bottom: -24%;
    width: 108vw;
    opacity: 0.42;
  }

  .guide-hero-inner {
    min-height: auto;
    padding-top: 82px;
    padding-bottom: 88px;
  }

  .guide-deck {
    font-size: 17px;
    line-height: 1.72;
  }

  .guide-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .guide-preface {
    font-size: 16px;
  }

  .guide-prose {
    font-size: 16px;
    line-height: 1.86;
  }

  .guide-chapter {
    padding-top: 62px;
    padding-bottom: 82px;
  }

  .guide-prose .guide-chapter h2 {
    margin-bottom: 38px;
  }

  .guide-prose .guide-chapter h3 {
    margin-top: 1.9em;
  }
}

@media (max-width: 640px) {
  .guide-document {
    padding-top: 34px;
  }

  .guide-document > .toc-tabs {
    margin-bottom: 58px;
  }

  .guide-hero .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .guide-hero .button-row .btn {
    width: 100%;
  }

  .guide-prose .callout {
    padding-right: 20px;
    padding-left: 28px;
  }

  .guide-prose pre {
    padding: 16px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .guide-hero::after {
    opacity: 0.5;
  }
}