/* ========================================
   FILE: frontend/css/collection.css
   ======================================== */

/* ── Page Header ──────────────────────────────────────────────────────────── */
.collection-header {
  background: var(--color-bg-light);
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}
.collection-title {
  font-size: clamp(1.5rem, 4vw, var(--font-size-3xl));
  font-weight: var(--font-weight-black);
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.collection-meta {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--space-xs);
}

/* ── Layout ───────────────────────────────────────────────────────────────── */
.collection-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  padding: var(--space-xl) 0 var(--space-3xl);
  align-items: start;
}

/* ── Desktop Sidebar ──────────────────────────────────────────────────────── */
.filter-sidebar {
  display: none;
}

.filter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.filter-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.filter-clear {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: none;
  border: none;
  padding: 0;
  transition: opacity var(--transition-fast);
}
.filter-clear:hover { opacity: 0.7; }

/* ── Filter Groups ────────────────────────────────────────────────────────── */
.filter-group {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}
.filter-group:last-child { border-bottom: none; padding-bottom: 0; }

.filter-group-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  width: 100%;
  color: var(--color-text);
  padding: 0;
}

.filter-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.filter-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  transition: color var(--transition-fast);
}
.filter-checkbox-label:hover { color: var(--color-primary); }
.filter-checkbox-label input[type="checkbox"],
.filter-checkbox-label input[type="radio"] {
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
  flex-shrink: 0;
}
.filter-count {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  margin-left: auto;
}

/* ── Color filter swatches ────────────────────────────────────────────────── */
.filter-colors {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}
.filter-color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
}
.filter-color-swatch::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid transparent;
  transition: border-color var(--transition-fast);
}
.filter-color-swatch.selected::after { border-color: var(--color-primary); }

/* ── Price Range ──────────────────────────────────────────────────────────── */
.price-range-inputs {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  font-size: var(--font-size-sm);
  margin-top: var(--space-sm);
}
.price-range-input {
  width: 90px;
  padding: 8px 10px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  text-align: center;
  font-family: var(--font-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}
.price-range-input:focus { border-color: var(--color-primary); }
.price-range-sep { color: var(--color-text-muted); flex-shrink: 0; }

/* ── Sort Bar ─────────────────────────────────────────────────────────────── */
.sort-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.sort-select {
  appearance: none;
  padding: 8px 36px 8px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-family: var(--font-primary);
  background: var(--color-bg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B6B6B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  cursor: pointer;
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast);
}
.sort-select:focus { border-color: var(--color-primary); }

/* ── Product Grid ─────────────────────────────────────────────────────────── */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

/* ── Active filter chips ──────────────────────────────────────────────────── */
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: rgba(255,60,0,0.08);
  border: 1px solid rgba(255,60,0,0.2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}
.filter-chip-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-primary);
  font-size: 14px;
  line-height: 1;
  padding: 0;
  opacity: 0.7;
}
.filter-chip-remove:hover { opacity: 1; }

/* ── Mobile bottom sheet ──────────────────────────────────────────────────── */
.filter-sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: calc(var(--z-modal) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.filter-sheet-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.filter-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  z-index: var(--z-modal);
  max-height: 88vh;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform var(--transition-slow);
  padding: var(--space-lg) var(--space-lg) calc(var(--space-3xl) + env(safe-area-inset-bottom));
}
.filter-sheet.open {
  transform: translateY(0);
}

.filter-sheet-handle {
  width: 40px;
  height: 4px;
  background: var(--color-border-dark);
  border-radius: 2px;
  margin: 0 auto var(--space-xl);
}

/* ── Filter FAB (mobile) ──────────────────────────────────────────────────── */
.filter-fab {
  position: sticky;
  bottom: var(--space-xl);
  display: flex;
  justify-content: center;
  z-index: var(--z-sticky);
  pointer-events: none;
  margin-top: var(--space-xl);
}
.filter-fab .btn {
  pointer-events: all;
  box-shadow: var(--shadow-lg);
}

/* ── Load more ────────────────────────────────────────────────────────────── */
.load-more-wrap {
  text-align: center;
  margin-top: var(--space-2xl);
}

/* ── Tablet overrides ─────────────────────────────────────────────────────── */
@media (min-width: 768px) {
  .products-grid { grid-template-columns: repeat(3, 1fr); gap: 14px; }
}

/* ── Desktop overrides ────────────────────────────────────────────────────── */
@media (min-width: 1024px) {
  .filter-sidebar { display: block; }
  .collection-layout { grid-template-columns: 220px 1fr; }
  .filter-fab { display: none; }
  .products-grid { grid-template-columns: repeat(3, 1fr); gap: 14px; }
}

@media (min-width: 1280px) {
  .products-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
}