/* ────────────────────────────────────────────────────────────────
   MODERN PREMIUM FILTER PANEL — GRS-IT
   Stil: Apple / Luxury E-commerce (Dark theme + Electric blue accent)
   ──────────────────────────────────────────────────────────────── */

/* ─── Base filter panel ─────────────────────────────────────────── */
.filter-panel-modern {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.filter-panel-modern__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.filter-panel-modern__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  letter-spacing: 0.5px;
}

/* ─── Active filters chips ──────────────────────────────────────── */
.filter-panel-modern__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 0; /* Allow shrink to 0 if empty */
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 20px; /* Pill shape */
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.filter-chip:hover {
  background: var(--accent-glow);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 142, 247, 0.2);
}

.filter-chip__remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.filter-chip__remove:hover {
  opacity: 1;
}

.filter-chip__remove svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 2;
}

/* ─── Clear all button ──────────────────────────────────────────── */
.filter-panel-modern__clear-btn {
  width: 100%;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-panel-modern__clear-btn:hover {
  border-color: var(--text-muted);
  color: var(--text);
  background: var(--surface-2);
}

.filter-panel-modern__clear-btn:active {
  transform: scale(0.98);
}

/* Hidden state */
.filter-panel-modern__clear-btn[style*="display: none"],
.filter-panel-modern__clear-btn[aria-hidden="true"] {
  display: none !important;
}

/* ─── Accordion sections ────────────────────────────────────────── */
.filter-accordion {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-accordion__item {
  border-bottom: 1px solid var(--border);
}

.filter-accordion__item:last-child {
  border-bottom: none;
}

/* Accordion button (header) */
.filter-accordion__button {
  width: 100%;
  padding: 14px 0;
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color var(--transition-fast);
  position: relative;
}

.filter-accordion__button:hover {
  color: var(--accent);
}

.filter-accordion__button:focus {
  outline: none;
}

.filter-accordion__button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  border-radius: 4px;
}

/* Accordion chevron icon */
.filter-accordion__chevron {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform 200ms cubic-bezier(0.33, 0.66, 0.66, 1);
}

.filter-accordion__button[aria-expanded="true"] .filter-accordion__chevron {
  transform: rotate(180deg);
}

/* Accordion content */
.filter-accordion__content {
  overflow: hidden;
  transition: all 200ms cubic-bezier(0.33, 0.66, 0.66, 1);
  max-height: 0;
  opacity: 0;
}

.filter-accordion__button[aria-expanded="true"] + .filter-accordion__content {
  max-height: 500px;
  opacity: 1;
  margin-bottom: 12px;
}

/* ─── Filter content sections ──────────────────────────────────── */
.filter-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Search input in filter sections */
.filter-section__search {
  width: 100%;
  padding: 8px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: all var(--transition-fast);
}

.filter-section__search::placeholder {
  color: var(--text-dim);
}

.filter-section__search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

/* Price inputs */
.filter-section__price-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.filter-section__price-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: all var(--transition-fast);
}

.filter-section__price-input::placeholder {
  color: var(--text-dim);
}

.filter-section__price-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

/* Checkboxes */
.filter-section__options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 250px;
  overflow-y: auto;
  padding-right: 6px; /* Space for scrollbar */
}

.filter-option {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-option:hover {
  background: var(--surface-2);
  border-color: rgba(79, 142, 247, 0.16);
}

.filter-option:focus-within {
  background: var(--surface-2);
  border-color: rgba(79, 142, 247, 0.22);
  box-shadow: 0 0 0 3px rgba(79, 142, 247, 0.12);
}

.filter-option__checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
  margin-top: 2px;
  flex-shrink: 0;
  transition: transform 150ms ease;
}

.filter-option__checkbox:checked {
  transform: scale(1.1);
}

.filter-option__label {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  width: 100%;
}

.filter-option:hover .filter-option__label {
  color: var(--text);
}

.filter-option__text {
  min-width: 0;
  color: inherit;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.filter-option__count {
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text-muted);
  background: var(--surface-3);
  padding: 6px 8px;
  border-radius: 999px;
  min-width: 32px;
  text-align: center;
  align-self: start;
  justify-self: end;
  white-space: nowrap;
}

/* ─── Mobile filter drawer ──────────────────────────────────────– */
.filter-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all 300ms ease;
  z-index: 999;
}

.filter-drawer-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.filter-drawer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  max-height: 85vh;
  background: var(--bg);
  border-radius: 20px 20px 0 0;
  padding: 20px;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform 300ms cubic-bezier(0.33, 0.66, 0.66, 1);
  z-index: 1000;
  display: none;
}

.filter-drawer.is-open {
  transform: translateY(0);
  display: block;
}

.filter-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.filter-drawer__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.filter-drawer__close {
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.filter-drawer__close:hover {
  background: var(--surface-2);
}

.filter-drawer__close svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
}

.filter-drawer__content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.filter-drawer__actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.filter-drawer__actions button {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-drawer__apply {
  background: var(--accent);
  color: white;
  border: none;
}

.filter-drawer__apply:active {
  transform: scale(0.98);
}

.filter-drawer__reset {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.filter-drawer__reset:hover {
  background: var(--surface-2);
  color: var(--text);
}

/* ─── Mobile toggle button ──────────────────────────────────────– */
.filter-mobile-toggle {
  display: none;
  width: 100%;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  margin-bottom: 20px;
  transition: all var(--transition-fast);
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.filter-mobile-toggle:hover {
  background: var(--surface-2);
  border-color: var(--accent);
}

.filter-mobile-toggle svg {
  width: 18px;
  height: 18px;
}

/* ─── Desktop layout ────────────────────────────────────────────– */
@media (min-width: 769px) {
  .filter-panel-modern {
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  /* Smooth scrollbar styling */
  .filter-panel-modern::-webkit-scrollbar {
    width: 6px;
  }

  .filter-panel-modern::-webkit-scrollbar-track {
    background: transparent;
  }

  .filter-panel-modern::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
  }

  .filter-panel-modern::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
  }

  .filter-drawer-overlay,
  .filter-drawer,
  .filter-mobile-toggle {
    display: none !important;
  }
}

/* ─── Tablet layout ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .filter-panel-modern {
    display: none;
  }

  .filter-mobile-toggle {
    display: flex;
  }

  .filter-drawer {
    left: 0;
    right: 0;
    width: 100%;
    border-radius: 20px 20px 0 0;
  }

  .filter-accordion__button {
    padding: 12px 0;
  }

  .filter-section__options {
    max-height: 180px;
  }

  .filter-option {
    padding: 10px;
  }

  .filter-option__label {
    gap: 10px;
  }
}

/* ─── Mobile layout ───────────────────────────────────────────── */
@media (max-width: 600px) {
  .filter-drawer {
    max-height: 90vh;
    padding: 16px;
  }

  .filter-drawer__header {
    margin-bottom: 16px;
    padding-bottom: 12px;
  }

  .filter-panel-modern__chips {
    gap: 6px;
  }

  .filter-chip {
    font-size: 0.75rem;
    padding: 5px 10px;
  }

  .filter-section__price-inputs {
    grid-template-columns: 1fr;
  }

  .filter-drawer__actions {
    flex-direction: column;
  }

  .filter-drawer__actions button {
    width: 100%;
  }
}

/* ─── Accessibility ───────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .filter-accordion__chevron,
  .filter-accordion__content,
  .filter-option__checkbox,
  .filter-drawer,
  .filter-drawer-overlay,
  .filter-chip {
    transition: none !important;
  }
}

/* ─── Animation helpers ───────────────────────────────────────── */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.filter-accordion__content {
  animation: slideUp 200ms ease forwards;
}

/* Scrollbar styling for filter sections */
.filter-section__options::-webkit-scrollbar {
  width: 4px;
}

.filter-section__options::-webkit-scrollbar-track {
  background: transparent;
}

.filter-section__options::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.filter-section__options::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}