/* ============================================================================
   collection.css — Shared filter/grid pattern used by collection pages.
   ----------------------------------------------------------------------------
   Consumed by:
     /blog.html               — posts grid (filters by series)
     /veteran-resources.html  — resources directory (filters by category)
     (future: analytics, reading)

   DOM contract:
     <section class="b-filterbar" id="b-filterbar">      ← sticky filter bar
       <div class="b-filterbar__inner">
         <div class="b-search"><input id="b-search" /></div>
         <div class="b-chips">
           <button class="b-chip" data-category="all" aria-pressed="true">All</button>
           <button class="b-chip" data-category="..."> ... </button>
         </div>
         <div class="b-sort">
           <label for="b-sort">Sort</label>
           <select id="b-sort"><option value="...">...</option></select>
         </div>
       </div>
     </section>

     <p class="b-count" id="b-count" aria-live="polite">Showing N</p>

     <ul class="b-grid" id="b-grid">
       <li class="b-card" data-category="..." data-date="..." data-search="...">
         <p class="b-card__eyebrow">...</p>
         <h3 class="b-card__title"><a>...</a></h3>
         <p class="b-card__dek">...</p>
         <div class="b-card__meta"> ... </div>
       </li>
     </ul>

     <div class="b-empty" id="b-empty" hidden> ... </div>

   Naming: .b-* (collection / blog). Cards opt-in to filtering by setting
   data-category. Sort is data-date by default (ISO-style, sorts lex-correctly).
   ========================================================================== */

/* ───────── Filter bar (sticky) ───────── */
.b-filterbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4) 0;
  margin-bottom: var(--space-6);
}
.b-filterbar__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: center;
}
@media (min-width: 720px) {
  .b-filterbar__inner {
    grid-template-columns: minmax(220px, 320px) 1fr auto;
  }
}

/* Hide elements that only make sense with JS. The script removes the class on init. */
.b-filterbar.js-only { display: none; }

/* ───────── Search input ───────── */
.b-search { position: relative; }
.b-search input {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 10px 12px 10px 36px;
  font-size: var(--text-sm);
  font-family: var(--sans);
  transition: border-color var(--t-base);
}
.b-search input:focus {
  outline: none;
  border-color: var(--honor);
}
.b-search::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  width: 14px;
  height: 14px;
  transform: translateY(-50%);
  background: no-repeat center/contain url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238A95A5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='7'/><path d='m21 21-4.3-4.3'/></svg>");
  pointer-events: none;
}

/* ───────── Chips ───────── */
.b-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.b-chip {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
}
.b-chip:hover { border-color: var(--border-strong); color: var(--text); }
.b-chip[aria-pressed="true"] {
  background: var(--accent);
  color: var(--text);
  border-color: var(--accent);
}

/* ───────── Sort dropdown ───────── */
.b-sort label {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-right: var(--space-2);
}
.b-sort select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 8px 10px;
  font-family: var(--sans);
  font-size: var(--text-sm);
  cursor: pointer;
}
.b-sort select:focus { outline: none; border-color: var(--honor); }

/* ───────── Result count ───────── */
.b-count {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: var(--space-5);
}

/* ───────── Card grid ───────── */
.b-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-7);
}
@media (min-width: 720px) {
  .b-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
  .b-grid--3 { grid-template-columns: repeat(3, 1fr); }
}
.b-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color var(--t-base), transform var(--t-base);
}
.b-card:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.b-card[hidden] { display: none !important; }
.b-card__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--honor);
  font-weight: 600;
}
.b-card__eyebrow.no-category { color: var(--text-dim); }
.b-card__title {
  font-family: var(--serif);
  font-size: var(--text-xl);
  line-height: 1.25;
  font-weight: 600;
  margin: 0;
}
.b-card__title a { color: var(--text); }
.b-card__title a:hover { color: var(--accent); }
.b-card__dek {
  color: var(--text-muted);
  line-height: 1.65;
  font-size: var(--text-sm);
  flex-grow: 1;
}
.b-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding-top: var(--space-3);
  border-top: 1px dashed var(--border);
}
.b-card__meta a { color: var(--accent); }
.b-card__meta .b-phone {
  color: var(--honor);
  font-family: var(--mono);
  letter-spacing: 0;
  text-transform: none;
}

/* ───────── Empty state ───────── */
.b-empty {
  padding: var(--space-7);
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 4px;
  color: var(--text-muted);
}
.b-empty[hidden] { display: none !important; }
.b-empty__title {
  font-family: var(--serif);
  font-size: var(--text-xl);
  color: var(--text);
  margin-bottom: var(--space-3);
}
.b-empty button {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 3px;
  cursor: pointer;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: var(--space-4);
  transition: all var(--t-fast);
}
.b-empty button:hover { background: var(--accent); border-color: var(--accent); }

/* Accessibility utility. */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}