.knowledge-nav {
  --knowledge-accent: #49b1f5;
  --knowledge-muted: var(--card-meta, #858585);
  --knowledge-surface: color-mix(in srgb, var(--font-color) 6%, var(--card-bg));
  position: relative;
  overflow: hidden;
  margin-bottom: 1rem;
}

.knowledge-nav::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--knowledge-accent), #8b7cf6 65%, #ff8c69);
  content: '';
}

.knowledge-nav .item-headline {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.9rem;
  font-weight: 600;
}

.knowledge-nav .item-headline i {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 9px;
  background: color-mix(in srgb, var(--knowledge-accent) 14%, transparent);
  color: var(--knowledge-accent);
  place-items: center;
}

.knowledge-nav-input,
.knowledge-nav-filter {
  box-sizing: border-box;
  width: 100%;
  height: 2.45rem;
  border: 1px solid transparent;
  border-radius: 10px;
  background-color: var(--knowledge-surface);
  color: var(--font-color);
  font-size: 0.82rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.knowledge-nav-input {
  margin-bottom: 0.5rem;
  padding: 0 0.75rem 0 2.25rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23858585' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20 20-4-4'/%3E%3C/svg%3E");
  background-position: 0.75rem 50%;
  background-repeat: no-repeat;
}

.knowledge-nav-filter {
  appearance: none;
  margin-bottom: 0;
  padding: 0 2.25rem 0 0.75rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23858585' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");
  background-position: calc(100% - 0.75rem) 50%;
  background-repeat: no-repeat;
}

.knowledge-nav-input:focus,
.knowledge-nav-filter:focus {
  border-color: var(--knowledge-accent);
  background-color: var(--card-bg);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--knowledge-accent) 15%, transparent);
  outline: none;
}

.knowledge-nav-input::placeholder {
  color: var(--knowledge-muted);
}

.knowledge-nav-hint {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--knowledge-muted);
  font-size: 0.7rem;
  line-height: 1.45;
  margin: 0.7rem 0 0.55rem;
}

.knowledge-nav-hint::before {
  width: 0.38rem;
  height: 0.38rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--knowledge-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--knowledge-accent) 12%, transparent);
  content: '';
}

.knowledge-nav-results {
  display: grid;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  max-height: 18rem;
  overflow-y: auto;
  padding: 0 0.2rem 0 0;
  scrollbar-color: color-mix(in srgb, var(--knowledge-accent) 55%, transparent) transparent;
  scrollbar-width: thin;
}

.knowledge-nav-result {
  display: flex;
  flex-direction: column;
  gap: 0.08rem;
  border-radius: 9px;
  padding: 0.48rem 0.62rem;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.knowledge-nav-result:hover {
  background: color-mix(in srgb, var(--knowledge-accent) 9%, transparent);
  transform: translateX(2px);
}

.knowledge-nav-result a {
  position: relative;
  overflow: hidden;
  padding-right: 1.2rem;
  color: var(--font-color);
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.knowledge-nav-result a::after {
  position: absolute;
  right: 0.1rem;
  color: var(--knowledge-accent);
  font-size: 1rem;
  line-height: 1;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  content: '\203A';
}

.knowledge-nav-result:hover a,
.knowledge-nav-result a:hover {
  color: var(--knowledge-accent);
}

.knowledge-nav-result:hover a::after {
  opacity: 1;
  transform: translateX(0);
}

.knowledge-nav-result small {
  overflow: hidden;
  color: var(--knowledge-muted);
  font-size: 0.65rem;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.knowledge-nav-empty {
  border-radius: 9px;
  background: var(--knowledge-surface);
  color: var(--knowledge-muted);
  font-size: 0.78rem;
  margin: 0.2rem 0;
  padding: 1.4rem 0.75rem;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  .knowledge-nav-result,
  .knowledge-nav-result a::after,
  .knowledge-nav-input,
  .knowledge-nav-filter {
    transition: none;
  }
}