/* Knowledge Hub page styles */
.hub-hero {
  background-color: var(--background-alt);
  padding: 4rem 1rem 2rem;
  text-align: center;
}
.hub-hero h1 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}
.hub-hero p {
  max-width: 700px;
  margin: 0 auto 1.5rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.hub-search-container {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}
.hub-search-container input[type="search"] {
  width: 100%;
  max-width: 500px;
  padding: 0.75rem 1rem;
  border: 2px solid var(--primary);
  border-radius: 6px;
  font-size: 1rem;
  background: var(--card-bg);
  color: var(--text-light);
  outline: none;
  transition: border-color 0.3s ease;
}
.hub-search-container input[type="search"]::placeholder {
  color: var(--text-muted);
}
.hub-search-container input[type="search"]:focus {
  border-color: var(--primary-hover);
}
.hub-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}
.hub-filters button {
  padding: 0.5rem 1rem;
  border: 2px solid var(--primary);
  border-radius: 6px;
  background: transparent;
  color: var(--primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease;
}
.hub-filters button.active,
.hub-filters button:hover {
  background-color: var(--primary);
  color: var(--on-primary);
}
.hub-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  padding: 0 1rem 4rem;
}
.doc-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-shadow: var(--shadow-soft);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.doc-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-medium);
}
.doc-card i {
  font-size: 1.75rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
  align-self: flex-start;
}
.doc-card h3 {
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  color: var(--text-light);
}
.doc-card p {
  flex-grow: 1;
  color: var(--text-muted);
  margin: 0 0 1rem;
  line-height: 1.4;
  font-size: 0.95rem;
}
.doc-card a {
  margin-top: auto;
  align-self: flex-start;
  padding: 0.5rem 1rem;
  background-color: var(--primary);
  color: var(--on-primary);
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  transition: background-color 0.3s ease, transform 0.2s ease;
}
.doc-card a:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}
.no-results {
  text-align: center;
  color: var(--text-muted);
  margin-top: 2rem;
  font-size: 1.1rem;
}
/* Responsive */
@media (max-width: 480px) {
  .hub-hero h1 {
    font-size: 2rem;
  }
  .hub-search-container input[type="search"] {
    max-width: 100%;
  }
}