/* ==========================================================================
   HUB PAGE LAYOUT
   Sidebar + hero (dot-grid) + card grid.
   Used by: resources, calculators, articles, templates, glossary
   ========================================================================== */

/* --- Layout Shell --- */
.hub-layout {
  display: flex;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  gap: 48px;
}

/* --- Sidebar --- */
.hub-sidebar {
  width: 240px;
  flex-shrink: 0;
  padding-top: 24px;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  border-right: 1px solid var(--border-light);
  padding-right: 32px;
}
.hub-sidebar::-webkit-scrollbar {
  width: 4px;
}
.hub-sidebar::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

/* Breadcrumb inside sidebar - inherits global breadcrumb styles */
.hub-breadcrumb {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.8125rem;
}

.hub-sidebar-group {
  margin-bottom: 32px;
}
.hub-sidebar-group h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin: 0 0 12px;
  font-weight: 600;
  font-family: var(--font-sans);
}
.hub-sidebar-link {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 8px 12px;
  margin-left: -12px;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: var(--transition-base);
  text-decoration: none;
}
.hub-sidebar-link:hover,
.hub-sidebar-link.active {
  background-color: var(--bg-subtle);
  color: var(--text-main);
}

/* --- Main Feed --- */
.hub-main {
  flex-grow: 1;
  padding-bottom: 120px;
  min-width: 0;
}

/* --- Hero (dot-grid background) --- */
.hub-hero {
  padding: 56px 0 40px;
  position: relative;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 48px;
  background-image: radial-gradient(var(--border-light) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: top center;
}
.hub-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, var(--bg-base) 90%);
}

.hub-hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}
.hub-hero-content h1 {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
  line-height: 1.1;
  color: var(--text-main);
}
.hub-hero-content p {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin: 0 0 32px;
  line-height: 1.6;
}

/* --- Search --- */
.hub-search {
  position: relative;
  display: flex;
  align-items: center;
}
.hub-search-input {
  width: 100%;
  padding: 18px 24px 18px 52px;
  font-size: 1.05rem;
  background: var(--bg-base);
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  outline: none;
  transition: var(--transition-base);
  font-family: var(--font-sans);
}
.hub-search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px var(--accent-subtle);
}
.hub-search-icon {
  position: absolute;
  left: 20px;
  color: var(--text-light);
  pointer-events: none;
}
.hub-search-kbd {
  position: absolute;
  right: 20px;
  font-size: 0.75rem;
  border: 1px solid var(--border-light);
  padding: 4px 8px;
  border-radius: 4px;
  color: var(--text-light);
  background: var(--bg-subtle);
  font-family: ui-monospace, monospace;
}

/* --- Trending / Quick Links --- */
.hub-trending {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.hub-trending > span {
  font-size: 0.875rem;
  color: var(--text-light);
  font-weight: 500;
}
.hub-trending-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid var(--border-light);
  transition: var(--transition-base);
  text-decoration: none;
}
.hub-trending-link:hover {
  border-color: var(--text-light);
  color: var(--text-main);
}

/* --- Card Grid --- */
.hub-grid {
  display: grid;
  gap: 20px;
}
.hub-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}
.hub-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

/* --- Cards --- */
.hub-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--bg-base);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: var(--transition-base);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
  text-decoration: none;
  color: var(--text-main);
}
.hub-card:hover {
  border-color: #cbd5e1;
  box-shadow: 0 12px 32px -12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.hub-card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
  line-height: 1.4;
}
.hub-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0 0 20px;
  flex-grow: 1;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.hub-card-link {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-top: auto;
}
.hub-card:hover .hub-card-link {
  letter-spacing: 0.01em;
}

/* --- Resource Clusters (resources hub page) --- */
.hub-cluster {
  margin-bottom: 64px;
}
.hub-cluster-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 16px;
}
.hub-cluster-header h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text-main);
}
.hub-cluster-count {
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 500;
  margin-left: 8px;
}
.hub-cluster-link {
  font-size: 0.875rem;
  color: var(--accent-primary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.hub-cluster-link:hover {
  text-decoration: underline;
}

/* --- Glossary overrides inside hub layout --- */
.hub-main .glossary-letter-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 16px 0;
  margin: 0 0 32px;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border-light);
}

/* --- Glossary letter active state --- */
.glossary-letter-link.active {
  background: var(--bg-dark);
  color: #fff;
}

/* --- No results (search filter) --- */
.hub-no-results {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-muted);
  font-size: 1rem;
  display: none;
}
.hub-no-results strong {
  display: block;
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 8px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hub-sidebar {
    display: none;
  }
}
@media (max-width: 768px) {
  .hub-grid--2,
  .hub-grid--3 {
    grid-template-columns: 1fr;
  }
  .hub-hero-content h1 {
    font-size: 2.25rem;
  }
  .hub-layout {
    padding: 0 16px;
  }
  .hub-hero {
    padding: 40px 0 32px;
    margin-bottom: 32px;
  }
  .hub-cluster-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .hub-card {
    padding: 20px;
  }
}