/* hub.css — Shared styles for Learn, Vendors, and Ebook Research hub pages */

/* Breadcrumb */
.hub-breadcrumb {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: var(--space-md);
}

.hub-breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.hub-breadcrumb a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.hub-breadcrumb .separator {
  margin: 0 0.35rem;
  opacity: 0.5;
}

/* Page header */
.hub-header {
  margin-bottom: var(--space-xl);
}

.hub-header h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3.4vw, var(--h1-size));
  line-height: 1.2;
}

.hub-subtitle {
  margin: 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 1.02rem;
}

/* Tag filter bar */
.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: var(--space-xl);
}

.tag-filters button {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
  font-family: var(--font-sans);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.tag-filters button:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.tag-filters button:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.tag-filters button.active {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

/* Start-here callout section */
.hub-start-here {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-alt);
  padding: 1.2rem 1.1rem;
  margin-bottom: var(--space-xl);
}

.hub-start-here h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: var(--h2-size);
}

.hub-start-here p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.hub-start-here-grid {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 600px) {
  .hub-start-here-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Card grid */
.hub-grid {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 600px) {
  .hub-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Individual card */
.hub-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 68%, transparent);
  padding: var(--card-padding);
  transition: border-color 0.15s;
}

.hub-card:hover {
  border-color: var(--accent);
}

.hub-card[hidden] {
  display: none;
}

.hub-card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-size: var(--h3-size);
}

.hub-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.hub-card h3 a:hover {
  text-decoration: underline;
}

.hub-card p {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.hub-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.hub-card-tags span {
  font-size: 0.72rem;
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
}

/* No results message */
.hub-no-results {
  display: none;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  color: var(--muted);
  font-size: 0.95rem;
}

.hub-no-results.visible {
  display: block;
}