/**
 * Tattoo Listings v2.0 - Filter Panel ( shell)
 * @description Filter panel: overlay, slide-in, search, checkboxes, chips, toggles
 * @version 1.0.0
 * @date 2026-02-26
 */

/* ================================================================
   FILTER OVERLAY
   ================================================================ */
.filter-overlay {
  position: fixed;
  inset: 0;
  z-index: 199;
  background: var(--bg-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.filter-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* ================================================================
   FILTER PANEL
   ================================================================ */
.filter-panel {
  position: fixed;
  z-index: 200;
  background: var(--bg);
  overflow-y: auto;
  transition: transform 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mobile: bottom sheet */
.filter-panel {
  inset: 0;
  transform: translateY(100%);
  border-radius: 12px 12px 0 0;
  margin-top: 3rem;
}

/* Desktop: right slide */
@media (min-width: 768px) {
  .filter-panel {
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    margin-top: 0;
    width: min(380px, 85vw);
    border-radius: 0;
    border-left: 1px solid var(--border);
    transform: translateX(100%);
  }
}

.filter-panel.open {
  transform: translate(0);
}

/* ================================================================
   FILTER PANEL HEADER
   ================================================================ */
.fp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 1;
}

.fp-title {
  font-family: var(--font-ui);
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.fp-close {
  width: 44px;
  height: 44px;
  min-width: 44px; /* DSv2 §G.2 #12 — touch target */
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: background var(--transition-normal);
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
}

.fp-close:hover {
  background: var(--bg-surface);
}

.fp-close svg {
  width: 20px;
  height: 20px;
}

/* ================================================================
   FILTER PANEL FOOTER (Apply / Clear)
   ================================================================ */
.fp-footer {
  padding: 1.15rem 1.25rem;
  position: sticky;
  bottom: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.fp-apply-btn {
  font-family: var(--font-ui);
  width: 100%;
  padding: 0.65rem;
  min-height: 44px; /* DSv2 §G.2 #12 — touch target */
  background: var(--gold);
  color: var(--color-black);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
}

.fp-apply-btn:hover {
  background: var(--gold-hover);
}

.fp-clear-btn {
  font-family: var(--font-ui);
  width: 100%;
  padding: 0.45rem;
  margin-top: 0.4rem;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  color: var(--text-3);
  text-align: center;
  transition: color var(--transition-normal);
  background: none;
  border: none;
  cursor: pointer;
}

.fp-clear-btn:hover {
  color: var(--gold);
}

/* ================================================================
   FILTER SECTIONS
   ================================================================ */
.fp-section {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
}

.fp-section-label {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
}

/* ================================================================
   CHECKBOX LIST
   ================================================================ */
.fp-checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 280px;
  overflow-y: auto;
  margin-top: 0.5rem;
  scrollbar-width: thin;
}

.fp-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
}

.fp-checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--gold);
  flex-shrink: 0;
}

.fp-checkbox-label {
  flex: 1;
}

.fp-count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-3);
}

/* ================================================================
   BODY PART GROUPS (collapsible)
   ================================================================ */
.fp-group {
  border-bottom: 1px solid var(--border);
}

.fp-group:last-child {
  border: none;
}

.fp-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0;
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
}

.fp-group-header::after {
  content: '\25B8';
  transition: transform 0.2s;
}

.fp-group.open .fp-group-header::after {
  transform: rotate(90deg);
}

.fp-group-items {
  display: none;
  padding-left: 0.5rem;
  padding-bottom: 0.5rem;
}

.fp-group.open .fp-group-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ================================================================
   SEGMENTED CONTROL (Color Mode)
   ================================================================ */
.fp-segmented {
  display: flex;
  gap: 0;
  margin-top: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.fp-seg-btn {
  flex: 1;
  padding: 0.45rem 0.5rem;
  min-height: 44px; /* DSv2 §G.2 #12 — touch target */
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  text-align: center;
  background: none;
  border: none;
  border-right: 1px solid var(--border);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.fp-seg-btn:last-child {
  border-right: none;
}

.fp-seg-btn.active {
  background: var(--gold);
  color: var(--color-black);
}

.fp-seg-btn:hover:not(.active) {
  background: var(--bg-surface);
}