.guide-hero {
  position: relative;
  max-width: 100%;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  padding-top: 88px;
  padding-bottom: 88px;
}

.guide-hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(48% 64% at 78% 28%, var(--ice-spot), var(--color-transparent) 72%),
    linear-gradient(180deg, var(--atmosphere-top), var(--atmosphere-bottom));
  content: "";
}

.guide-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, .7fr);
  gap: 72px;
  align-items: center;
}

.guide-hero-copy {
  max-width: 760px;
}

.guide-hero-copy h1 {
  max-width: 720px;
  margin-bottom: 24px;
}

.guide-hero-lead {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.8;
}

.guide-hero-actions {
  display: flex;
  margin-top: 30px;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
}

.guide-facts {
  display: flex;
  margin-top: 30px;
  flex-wrap: wrap;
  gap: 10px;
}

.guide-index {
  position: relative;
  overflow: hidden;
  padding: 34px;
}

.guide-index::after {
  position: absolute;
  right: -20px;
  bottom: -28px;
  width: 180px;
  height: 130px;
  background-image: radial-gradient(circle, var(--color-accent) 0 3px, var(--color-transparent) 4px);
  background-size: 19px 19px;
  content: "";
  opacity: .11;
}

.guide-index h2 {
  position: relative;
  z-index: 1;
  margin-bottom: 16px;
  font-size: 30px;
}

.guide-index > p {
  position: relative;
  z-index: 1;
  color: var(--color-muted);
}

.guide-index-list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0;
  margin: 26px 0 0;
}

.guide-index-list div {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 14px;
  border-top: 1px solid var(--color-border);
  padding: 14px 0;
}

.guide-index-list dt {
  color: var(--color-text);
  font-weight: 750;
}

.guide-index-list dd {
  margin: 0;
  color: var(--color-muted);
}

.guide-document {
  padding-bottom: var(--section-space);
}

.guide-document > .toc-tabs {
  top: 0;
  margin-bottom: 0;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 64px;
  align-items: start;
}

.guide-prose {
  min-width: 0;
}

.guide-chapter {
  padding-top: 86px;
  padding-bottom: 86px;
  border-bottom: 1px solid var(--color-border);
}

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

.guide-chapter > h2 {
  max-width: 760px;
  margin-bottom: 34px;
}

.guide-chapter > h3 {
  margin-top: 42px;
  margin-bottom: 16px;
  font-size: 24px;
}

.guide-chapter > p {
  max-width: 820px;
  font-size: 17px;
  line-height: 1.9;
}

.chapter-label {
  display: inline-block;
  margin-bottom: 14px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}

.guide-chapter .compare-table-wrap,
.guide-chapter .route-table-wrap {
  margin-top: 34px;
  margin-bottom: 38px;
}

.guide-chapter pre {
  margin-top: 24px;
  margin-bottom: 28px;
}

.guide-rail {
  position: sticky;
  top: 76px;
  display: grid;
  gap: 18px;
  padding-top: 86px;
}

.guide-rail-card {
  padding: 24px;
  box-shadow: none;
}

.guide-rail-card h3 {
  margin-bottom: 18px;
  font-size: 21px;
}

.guide-rail-card ul {
  display: grid;
  gap: 12px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  color: var(--color-muted);
  font-size: 14px;
}

.guide-rail-card li {
  position: relative;
  padding-left: 18px;
}

.guide-rail-card li::before {
  position: absolute;
  top: .72em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.guide-rail-card .btn-secondary {
  width: 100%;
}

.guide-rail-card dl {
  display: grid;
  gap: 0;
  margin: 0;
}

.guide-rail-card dl div {
  border-top: 1px solid var(--color-border);
  padding: 12px 0;
}

.guide-rail-card dt {
  color: var(--color-muted);
  font-size: 12px;
}

.guide-rail-card dd {
  margin: 3px 0 0;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 700;
}

@media (max-width: 1040px) {
  .guide-hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .guide-index {
    max-width: 720px;
  }

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

  .guide-rail {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-top: 0;
  }
}

@media (max-width: 768px) {
  .guide-hero {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .guide-hero-lead {
    font-size: 16px;
  }

  .guide-index {
    padding: 26px;
  }

  .guide-index h2 {
    font-size: 27px;
  }

  .guide-chapter {
    padding-top: 68px;
    padding-bottom: 68px;
  }

  .guide-chapter > h3 {
    margin-top: 34px;
    font-size: 22px;
  }

  .guide-chapter > p {
    font-size: 16px;
    line-height: 1.85;
  }

  .guide-rail {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .guide-hero {
    padding-top: 48px;
    padding-bottom: 52px;
  }

  .guide-hero-grid {
    gap: 34px;
  }

  .guide-hero-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
  }

  .guide-hero-actions .btn-primary,
  .guide-hero-actions .btn-quiet {
    width: 100%;
  }

  .guide-index {
    padding: 22px 18px;
  }

  .guide-index-list div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .guide-chapter {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .guide-rail-card {
    padding: 20px;
  }
}