.guide-hero {
  position: relative;
  padding-top: 82px;
  padding-bottom: 72px;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel-soft);
}

.guide-hero::before {
  content: "";
  position: absolute;
  top: -240px;
  left: 50%;
  width: 760px;
  height: 620px;
  transform: translateX(-50%);
  background: var(--gradient-atmosphere);
  opacity: 0.72;
  pointer-events: none;
}

.guide-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px), linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, var(--color-text), var(--color-transparent));
  opacity: 0.5;
  pointer-events: none;
}

.guide-hero-inner {
  position: relative;
  z-index: 2;
  max-width: 880px;
  margin-inline: auto;
  padding-inline: var(--gutter);
  text-align: center;
}

.guide-hero h1 {
  margin-bottom: 22px;
}

.guide-hero .lead {
  margin-inline: auto;
}

.guide-context {
  max-width: 760px;
  margin: 30px auto 0;
  padding: 20px 22px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-muted);
  text-align: left;
  box-shadow: var(--shadow-panel);
}

.guide-context p:last-child {
  margin-bottom: 0;
}

.guide-context a {
  color: var(--color-accent-dark);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 3px;
}

.guide-facts {
  margin-top: 22px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.guide-layout {
  width: 100%;
  max-width: calc(var(--wrap-wide) + var(--gutter) + var(--gutter));
  margin-inline: auto;
  padding: 42px var(--gutter) var(--section-space);
  display: grid;
  grid-template-columns: minmax(210px, 250px) minmax(0, 820px);
  justify-content: center;
  align-items: start;
  gap: 56px;
}

.guide-sidebar {
  position: sticky;
  top: var(--toc-top);
}

.guide-sidebar-label {
  margin-bottom: 12px;
  color: var(--color-muted-light);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guide-sidebar .toc-tabs {
  position: static;
  padding: 8px;
  display: grid;
  gap: 2px;
  overflow: visible;
}

.guide-sidebar .toc-tabs a {
  width: 100%;
  min-height: 41px;
  padding-inline: 12px;
  justify-content: flex-start;
  white-space: normal;
}

.guide-sidebar .toc-tabs a::before {
  content: "";
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-strong);
  background: var(--color-panel);
}

.guide-sidebar .toc-tabs a:hover::before,
.guide-sidebar .toc-tabs a.is-current::before,
.guide-sidebar .toc-tabs a[aria-current="location"]::before {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

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

.guide-chapter {
  padding-top: 78px;
  padding-bottom: 78px;
  border-bottom: 1px solid var(--color-border);
}

.guide-chapter:first-child {
  padding-top: 18px;
}

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

.chapter-label {
  margin-bottom: 10px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.guide-chapter h2 {
  margin-bottom: 28px;
}

.guide-chapter h3 {
  margin-top: 38px;
  font-size: 23px;
}

.guide-chapter p,
.guide-chapter li {
  color: var(--color-muted);
}

.guide-chapter strong {
  color: var(--color-text);
}

.guide-chapter a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 3px;
}

.guide-chapter .table-shell {
  margin: 28px 0;
}

.guide-chapter .data-table {
  min-width: 760px;
}

.guide-chapter .data-table th {
  background: var(--color-panel-soft);
}

.guide-chapter .data-table td:first-child {
  color: var(--color-text);
  font-weight: 620;
}

.guide-check {
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 10px;
  list-style: none;
}

.guide-check li {
  position: relative;
  padding: 14px 16px 14px 43px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
}

.guide-check li::before {
  content: "✓";
  position: absolute;
  top: 14px;
  left: 16px;
  color: var(--color-success);
  font-weight: 750;
}

.diagnostic-flow {
  margin: 28px 0;
  padding: 22px;
  display: grid;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-soft);
}

.diagnostic-step {
  padding-bottom: 12px;
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 16px;
  border-bottom: 1px solid var(--color-border);
}

.diagnostic-step:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.diagnostic-key {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.diagnostic-value {
  color: var(--color-muted);
}

.code-caption {
  margin-bottom: 8px;
  color: var(--color-muted-light);
  font-family: var(--font-mono);
  font-size: 11px;
}

.guide-links {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.guide-link-card {
  min-height: 132px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
}

.guide-link-card span {
  margin-bottom: 8px;
  color: var(--color-muted-light);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.guide-link-card strong {
  font-size: 15px;
}

.guide-link-card small {
  margin-top: auto;
  color: var(--color-accent-dark);
  font-size: 12px;
  font-weight: 650;
}

.guide-promo {
  margin-top: 64px;
}

.guide-promo .promo-content p:last-of-type {
  max-width: 650px;
  color: var(--color-muted);
}

@media (max-width: 980px) {
  .guide-layout {
    display: block;
    padding-top: 24px;
  }

  .guide-sidebar {
    position: relative;
    z-index: 30;
    top: auto;
    margin-bottom: 34px;
  }

  .guide-sidebar-label {
    display: none;
  }

  .guide-sidebar .toc-tabs {
    position: sticky;
    top: var(--toc-top);
    display: flex;
    overflow-x: auto;
  }

  .guide-sidebar .toc-tabs a {
    width: auto;
    white-space: nowrap;
  }
}

@media (max-width: 700px) {
  .guide-hero {
    padding-top: 58px;
    padding-bottom: 54px;
  }

  .guide-context {
    padding: 18px;
  }

  .guide-layout {
    padding-inline: var(--gutter);
  }

  .guide-chapter {
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .guide-chapter:first-child {
    padding-top: 8px;
  }

  .guide-chapter h3 {
    margin-top: 32px;
    font-size: 21px;
  }

  .diagnostic-step {
    grid-template-columns: 1fr;
    gap: 5px;
  }

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

  .guide-link-card {
    min-height: 112px;
  }
}