.nd-guide {
  background: var(--nd-bg);
  border-bottom: 1px solid var(--nd-border);
}

.nd-guide-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 88px 32px;
}

.nd-guide-head {
  max-width: 640px;
  margin-bottom: 48px;
}

.nd-guide-head .nd-guide-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--nd-accent);
}

.nd-guide-head .nd-guide-title {
  margin: 0 0 14px;
  font-size: 38px;
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.5px;
  color: var(--nd-text);
}

.nd-guide-head .nd-guide-intro {
  margin: 0;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--nd-muted);
}

.nd-guide-body {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.nd-guide-nav {
  position: sticky;
  top: 104px;
  min-width: 0;
  padding: 20px 18px;
  background: var(--nd-bg-raised);
  border: 1px solid var(--nd-border);
  border-radius: 12px;
}

.nd-guide-nav-title {
  margin: 0 0 14px;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--nd-muted);
}

.nd-guide-nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--nd-border);
}

.nd-guide-nav-item a {
  display: block;
  padding: 9px 0 9px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--nd-muted);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

.nd-guide-nav-item a:hover { color: var(--nd-text); }

.nd-guide-nav-item.is-active a {
  color: var(--nd-accent);
  border-left-color: var(--nd-accent);
  font-weight: 500;
}

.nd-guide-main { min-width: 0; }

.nd-guide-group {
  margin-bottom: 56px;
  scroll-margin-top: 110px;
}

.nd-guide-group:last-child { margin-bottom: 0; }

.nd-guide-group-title {
  margin: 0 0 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--nd-border);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--nd-accent);
}

.nd-guide-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nd-guide-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0;
  padding: 26px 0;
  border-bottom: 1px solid var(--nd-border);
}

.nd-guide-item:last-child { border-bottom: none; padding-bottom: 0; }

.nd-guide-marker {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding-top: 3px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1.3px;
  color: var(--nd-muted);
}

.nd-guide-marker--icon {
  align-items: flex-start;
  padding-top: 2px;
}

.nd-guide-marker svg {
  width: 18px;
  height: 18px;
}

.nd-guide-item--do .nd-guide-marker { color: var(--nd-accent); }
.nd-guide-item--dont .nd-guide-marker { color: var(--nd-danger); }
.nd-guide-item--neutral .nd-guide-marker { color: var(--nd-muted); }

.nd-guide-item-body { min-width: 0; }

.nd-guide-item-title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.32;
  letter-spacing: -0.15px;
  color: var(--nd-text);
}

.nd-guide-item-text p {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--nd-muted);
}

.nd-guide-item-text p:last-child { margin-bottom: 0; }

.nd-guide-item-text a {
  color: var(--nd-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.nd-guide-item-text ul,
.nd-guide-item-text ol {
  margin: 0 0 12px;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--nd-muted);
}

.nd-guide-item-text li { margin-bottom: 6px; }

.nd-guide-item-text strong {
  font-weight: 500;
  color: var(--nd-text);
}

.nd-guide-example {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--nd-bg-raised);
  border: 1px solid var(--nd-border);
  border-left: 2px solid var(--nd-border);
  border-radius: 0;
}

.nd-guide-example-label {
  display: block;
  margin-bottom: 8px;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 1.3px;
  text-transform: uppercase;
  color: var(--nd-muted);
}

.nd-guide-example-text {
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.65;
  color: var(--nd-text);
}

.nd-guide-empty {
  margin: 0;
  padding: 64px 0;
  text-align: center;
  font-size: 15px;
  color: var(--nd-muted);
}

@media (max-width: 1080px) {
  .nd-guide-inner { padding: 76px 24px; }
  .nd-guide-head .nd-guide-title { font-size: 34px; letter-spacing: -0.4px; }
  .nd-guide-body { grid-template-columns: 210px minmax(0, 1fr); gap: 36px; }
}

@media (max-width: 900px) {
  .nd-guide-body { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .nd-guide-nav { position: static; }
  .nd-guide-nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    border-left: none;
  }
  .nd-guide-nav-item a {
    padding: 8px 14px;
    margin-left: 0;
    border-left: none;
    border: 1px solid var(--nd-border);
    border-radius: 16px;
  }
  .nd-guide-nav-item.is-active a {
    border-color: var(--nd-accent);
  }
}

@media (max-width: 640px) {
  .nd-guide-inner { padding: 56px 16px; }
  .nd-guide-head { margin-bottom: 32px; }
  .nd-guide-head .nd-guide-eyebrow { margin-bottom: 12px; font-size: 11px; letter-spacing: 1.4px; }
  .nd-guide-head .nd-guide-title { font-size: 28px; letter-spacing: -0.3px; }
  .nd-guide-head .nd-guide-intro { font-size: 15px; }
  .nd-guide-group { margin-bottom: 40px; }
  .nd-guide-item { grid-template-columns: 34px minmax(0, 1fr); padding: 22px 0; }
  .nd-guide-item-title { font-size: 17px; }
  .nd-guide-item-text p { font-size: 14px; }
  .nd-guide-example { padding: 12px 14px; }
}