/* ==========================================
   THE HUB — curated resource library
   ========================================== */

.hub-page { padding-block: clamp(2.5rem, 6vw, 4.5rem); }

.hub-page > .wrap > .page-head { max-width: var(--text-w); margin-bottom: 2.5rem; }

/* ---- Filter bar ---- */
.hub-filters {
  position: sticky;
  top: var(--nav-h);
  z-index: 100;
  background: rgba(10, 13, 18, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.hub-filters__row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-block: 0.9rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.hub-filters__row::-webkit-scrollbar { display: none; }

.hub-filter-btn {
  flex-shrink: 0;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.5em 0.9em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur-fast) var(--ease);
  white-space: nowrap;
}

.hub-filter-btn:hover { border-color: var(--accent); color: var(--text); }

.hub-filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0d12;
  font-weight: 600;
}

.hub-search {
  margin-left: auto;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg-inset);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 0.5em 0.85em;
  color: var(--text);
  width: 200px;
}

.hub-search::placeholder { color: var(--text-faint); }
.hub-search:focus { border-color: var(--accent); outline: none; }

/* ---- HTMX loading indicator ---- */
.hub-spinner {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--line-strong);
  border-top-color: var(--accent);
  opacity: 0;
  transition: opacity 0.15s ease;
  animation: hub-spin 0.6s linear infinite;
}

.htmx-indicator { opacity: 0; }
.htmx-request.htmx-indicator,
.htmx-request .htmx-indicator {
  opacity: 1;
}

@keyframes hub-spin {
  to { transform: rotate(360deg); }
}

/* ---- Category groups ---- */
.hub-category { margin-bottom: clamp(2.5rem, 5vw, 4rem); }

.hub-category__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.hub-category__head h2 { font-size: var(--step-2); }
.hub-category__count { font-family: var(--font-mono); font-size: var(--step--1); color: var(--text-faint); }

.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.hub-item {
  background: var(--bg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: background var(--dur-fast) var(--ease);
}

.hub-item:hover { background: var(--bg-card); }

.hub-item__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 0.75rem; }

.hub-item__title { font-size: var(--step-0); font-weight: 600; }
.hub-item__title a { color: var(--text); }
.hub-item__title a:hover { color: var(--accent); }

.hub-item__cost {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.2em 0.55em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  color: var(--text-faint);
}

.hub-item__cost--free { color: var(--ok); border-color: rgba(107,207,158,0.35); }
.hub-item__cost--paid { color: var(--accent); border-color: var(--accent-line); }

.hub-item__author {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

.hub-item__desc { font-size: var(--step--1); color: var(--text-dim); margin-bottom: 0; }

.hub-item__why {
  font-size: 0.8rem;
  color: var(--text-faint);
  border-left: 2px solid var(--accent-line);
  padding-left: 0.75rem;
}

.hub-item__why strong { color: var(--text-dim); font-weight: 600; }

.hub-item__tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.15rem; }

.hub-empty {
  padding: 3rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-faint);
  display: none;
}