.filter-form {
  display: grid;
  gap: var(--sp-4);
  padding: var(--sp-4);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-sm);
}

.panel-title {
  margin: 0 0 0.5rem;
  font-weight: 600;
}

.filter-form .panel-title {
  margin: 0;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--c-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.filter-form__field,
.filter-form__prices label {
  display: grid;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  color: var(--c-text-secondary);
}

.filter-form input[type="search"],
.filter-form input[type="text"],
.filter-form input[type="number"],
.filter-form select {
  width: 100%;
  min-height: 44px;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-surface);
  color: var(--c-text);
  font-size: 16px;
}

.filter-form input[type="search"]:focus,
.filter-form input[type="number"]:focus,
.filter-form select:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(var(--c-accent-rgb), 0.22);
}

.filter-form input[type="number"]::-webkit-outer-spin-button,
.filter-form input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.filter-form input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

.filter-form__check {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: 44px;
  padding: 0 0.15rem;
  color: var(--c-text);
  font-size: var(--fs-sm);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.filter-form__check input[type="checkbox"] {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.filter-form__box {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--c-border-strong);
  border-radius: 4px;
  background: var(--c-surface);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px 12px;
  pointer-events: none;
}

.filter-form__check:hover .filter-form__box,
.filter-form__check:focus-within .filter-form__box {
  border-color: var(--c-accent);
}

.filter-form__check input[type="checkbox"]:checked + .filter-form__box {
  background-color: var(--c-accent);
  border-color: var(--c-accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23fff' stroke-width='2' d='M3 8l3 3 7-7'/%3E%3C/svg%3E");
}

.filter-form__check input[type="checkbox"]:focus-visible + .filter-form__box {
  box-shadow: 0 0 0 3px rgba(var(--c-accent-rgb), 0.22);
}

.filter-form__group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.filter-form__group legend {
  padding: 0;
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--c-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.filter-form__prices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
}

.filter-form__actions {
  display: grid;
  gap: var(--sp-2);
}

.filter-form__actions .btn {
  width: 100%;
}

.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--sp-3);
  margin-bottom: var(--space);
}

.filter-toggle-btn {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
  min-height: 44px;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-surface);
  color: var(--c-text);
  font: inherit;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.filter-toggle-btn:hover,
.filter-toggle-btn:focus-visible {
  border-color: var(--c-accent);
  color: var(--c-accent-dark);
}

.filter-toggle-btn__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.35rem;
  border-radius: var(--r-pill);
  background: var(--c-accent);
  color: var(--c-text-inverse);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  line-height: 1;
}

.filter-toggle-btn__count.is-empty {
  display: none;
}

.catalog-sort {
  position: relative;
  z-index: var(--z-raised);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.catalog-sort__label {
  font-size: var(--fs-sm);
  color: var(--c-text-secondary);
}

.catalog-cats {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--sp-4);
}

.catalog-cats .panel-title {
  margin: 0 0 var(--sp-3);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--c-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.catalog-cats__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.catalog-cats__list--nested {
  margin: var(--sp-1) 0 var(--sp-2);
  padding-left: var(--sp-3);
  border-left: 1px solid var(--c-border);
}

.catalog-cats__link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0.35rem 0.75rem;
  border-radius: var(--r-sm);
  color: var(--c-text);
  font-size: var(--fs-sm);
  line-height: var(--lh-snug);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.catalog-cats__link:hover,
.catalog-cats__link:focus-visible {
  background: var(--c-accent-bg);
  color: var(--c-accent-dark);
  text-decoration: none;
}

.catalog-cats__link.is-branch:not(.is-active) {
  color: var(--c-accent-dark);
  font-weight: var(--fw-medium);
}

.catalog-cats__link.is-active,
.catalog-cats__link[aria-current="page"] {
  background: var(--c-accent);
  color: var(--c-text-inverse);
  font-weight: var(--fw-semibold);
}

.catalog-cats__link.is-active:hover,
.catalog-cats__link.is-active:focus-visible,
.catalog-cats__link[aria-current="page"]:hover,
.catalog-cats__link[aria-current="page"]:focus-visible {
  background: var(--c-accent-dark);
  color: var(--c-text-inverse);
}

.sidebar-sticky {
  display: grid;
  gap: var(--space);
  align-content: start;
}

.filter-drawer__header {
  display: none;
}

.filter-drawer__body {
  display: contents;
}

.filter-backdrop {
  display: none;
}

@media (min-width: 900px) {
  .sidebar-sticky {
    position: sticky;
    top: calc(var(--header-h) + var(--space));
    max-height: calc(100dvh - var(--header-h) - 2 * var(--space));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (max-width: 899px) {
  .layout-catalog {
    display: block;
  }

  .catalog-toolbar {
    flex-wrap: nowrap;
    justify-content: space-between;
    gap: var(--sp-2);
  }

  .filter-toggle-btn {
    display: inline-flex;
  }

  .catalog-sort {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    flex-wrap: nowrap;
    justify-content: flex-end;
  }

  .catalog-sort__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
  }

  .catalog-sort .custom-dropdown {
    width: auto;
    max-width: 100%;
    flex: 1 1 auto;
    min-width: 0;
  }

  .filter-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-drawer) - 1);
    background: rgba(26, 26, 26, 0.45);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--t-base), visibility var(--t-base);
  }

  html.is-filter-open .filter-backdrop {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .sidebar-sticky {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    z-index: var(--z-drawer);
    width: min(22.5rem, 92vw);
    max-height: none;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 0;
    background: var(--c-surface);
    padding-top: var(--safe-top);
    padding-right: var(--safe-right);
    padding-bottom: var(--safe-bottom);
    transform: translate3d(100%, 0, 0);
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--t-base), visibility var(--t-base);
  }

  html.is-filter-open .sidebar-sticky {
    transform: none;
    visibility: visible;
    pointer-events: auto;
  }

  .filter-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-3);
    flex-shrink: 0;
    min-height: 3.5rem;
    padding: var(--sp-3) var(--sp-4);
    border-bottom: 1px solid var(--c-border);
  }

  .filter-drawer__title {
    margin: 0;
    font-size: var(--fs-lg);
    font-weight: var(--fw-bold);
  }

  .filter-drawer__close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--c-text);
    cursor: pointer;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
  }

  .filter-drawer__close-icon {
    position: relative;
    width: 1.25rem;
    height: 1.25rem;
  }

  .filter-drawer__close-icon::before,
  .filter-drawer__close-icon::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
  }

  .filter-drawer__close-icon::before {
    transform: rotate(45deg);
  }

  .filter-drawer__close-icon::after {
    transform: rotate(-45deg);
  }

  .filter-drawer__body {
    display: grid;
    gap: var(--space);
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: var(--sp-4);
    padding-bottom: calc(var(--sp-4) + var(--safe-bottom));
  }

  .sidebar-sticky .catalog-cats,
  .sidebar-sticky .filter-form {
    border: 0;
    padding: 0;
    background: transparent;
  }

  .filter-form .panel-title {
    display: none;
  }

  html.is-filter-open {
    overflow: hidden;
  }

  body.is-filter-open {
    overflow: hidden;
    touch-action: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .filter-backdrop,
  .sidebar-sticky {
    transition: none;
  }
}