/**
 * Ultra-Light Smart Filter - Frontend Styles
 *
 * Layout: Flexbox/Grid
 * Modes: Horizontal, Vertical, Off-canvas
 * Responsive: Auto off-canvas on mobile (<= 768px)
 *
 * @package UltraLightSmartFilter
 */

/* ============================================================
   CSS Custom Properties (Design Tokens)
   ============================================================ */
:root {
    --ulsf-primary: #4F46E5;
    --ulsf-primary-hover: #4338CA;
    --ulsf-primary-light: #EEF2FF;
    --ulsf-primary-alpha: rgba(79, 70, 229, 0.1);

    --ulsf-text: #1E293B;
    --ulsf-text-secondary: #64748B;
    --ulsf-text-muted: #94A3B8;

    --ulsf-bg: #FFFFFF;
    --ulsf-bg-hover: #F8FAFC;
    --ulsf-border: #E2E8F0;
    --ulsf-border-focus: #4F46E5;

    --ulsf-success: #10B981;
    --ulsf-danger: #EF4444;

    --ulsf-radius-sm: 6px;
    --ulsf-radius: 10px;
    --ulsf-radius-lg: 14px;
    --ulsf-radius-full: 50%;

    --ulsf-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --ulsf-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --ulsf-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);

    --ulsf-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --ulsf-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --ulsf-offcanvas-width: 340px;
}

/* ============================================================
   Reset & Base
   ============================================================ */
.ulsf-filter *,
.ulsf-filter *::before,
.ulsf-filter *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.ulsf-filter {
    font-family: var(--ulsf-font);
    font-size: 14px;
    line-height: 1.5;
    color: var(--ulsf-text);
    -webkit-font-smoothing: antialiased;
}

/* ============================================================
   Off-canvas Toggle Button
   ============================================================ */
.ulsf-offcanvas-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--ulsf-bg);
    border: 1.5px solid var(--ulsf-border);
    border-radius: var(--ulsf-radius);
    color: var(--ulsf-text);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--ulsf-transition);
    font-family: var(--ulsf-font);
}

.ulsf-offcanvas-toggle:hover {
    border-color: var(--ulsf-primary);
    color: var(--ulsf-primary);
    box-shadow: var(--ulsf-shadow-sm);
}

/* Mobile toggle: ẩn trên desktop, hiện trên mobile */
.ulsf-mobile-toggle {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--ulsf-primary);
    border: none;
    border-radius: var(--ulsf-radius);
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--ulsf-transition);
    font-family: var(--ulsf-font);
}

.ulsf-mobile-toggle:hover {
    background: var(--ulsf-primary-hover);
}

/* ============================================================
   Overlay (Off-canvas backdrop)
   ============================================================ */
.ulsf-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 99998;
    opacity: 0;
    transition: opacity var(--ulsf-transition);
}

.ulsf-overlay--active {
    display: block;
    opacity: 1;
}

/* ============================================================
   LAYOUT: HORIZONTAL (Hàng ngang)
   ============================================================ */

/*
 * Force overflow visible trên các parent containers phổ biến
 * để dropdown không bị cắt bởi Bricks Builder hoặc theme containers
 */
.brxe-shortcode,
.brxe-code,
.brxe-div,
.brxe-section,
.brxe-container,
.brxe-block,
.entry-content,
.woocommerce,
.woocommerce-page,
.ulsf-filter--horizontal,
.ulsf-filter--horizontal .ulsf-filter__body {
    overflow: visible !important;
}

.ulsf-filter--horizontal {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-start;
    padding: 18px 24px;
    background: var(--ulsf-bg);
    border: 1px solid var(--ulsf-border);
    border-radius: var(--ulsf-radius-lg);
    box-shadow: var(--ulsf-shadow-sm);
    margin-bottom: 40px;
    position: relative;
    z-index: 9999 !important;
}

.ulsf-filter--horizontal .ulsf-filter__header {
    display: none;
}

.ulsf-filter--horizontal .ulsf-filter__body {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    flex: 1;
    align-items: flex-start;
}

.ulsf-filter--horizontal .ulsf-filter-group {
    position: relative;
    flex: 0 0 auto;
    z-index: 9999;
}

.ulsf-filter--horizontal .ulsf-filter-group__header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--ulsf-bg-hover);
    border: 1.5px solid var(--ulsf-border);
    border-radius: var(--ulsf-radius);
    cursor: pointer;
    transition: all var(--ulsf-transition);
    user-select: none;
    font-size: 13px;
    font-weight: 500;
}

.ulsf-filter--horizontal .ulsf-filter-group__header:hover {
    border-color: var(--ulsf-primary);
    background: var(--ulsf-primary-alpha);
}

.ulsf-filter--horizontal .ulsf-filter-group__content {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 300px;
    max-height: 0;
    overflow: hidden;
    background: var(--ulsf-bg);
    border-radius: var(--ulsf-radius);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--ulsf-border);
    z-index: 999999 !important;
    opacity: 0;
    transform: translateY(-8px);
    transition: all var(--ulsf-transition);
    pointer-events: none;
}

.ulsf-filter--horizontal .ulsf-filter-group.ulsf-filter-group--open .ulsf-filter-group__content {
    max-height: 400px;
    overflow-y: auto;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    padding: 16px;
}

.ulsf-filter--horizontal .ulsf-filter-group--price .ulsf-filter-group__content {
    min-width: 340px;
}

.ulsf-filter--horizontal .ulsf-filter__footer {
    display: flex;
    gap: 10px;
    align-items: center;
}

.ulsf-filter--horizontal .ulsf-active-filters {
    width: 100%;
    margin-top: 6px;
}

/* ============================================================
   LAYOUT: VERTICAL (Hàng dọc - Sidebar)
   ============================================================ */
.ulsf-filter--vertical {
    display: flex;
    flex-direction: column;
    background: var(--ulsf-bg);
    border: 1px solid var(--ulsf-border);
    border-radius: var(--ulsf-radius-lg);
    box-shadow: var(--ulsf-shadow-sm);
    overflow: hidden;
}

.ulsf-filter--vertical .ulsf-filter__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--ulsf-primary), var(--ulsf-primary-hover));
    color: #fff;
}

.ulsf-filter--vertical .ulsf-filter__header .ulsf-filter__close {
    display: none;
}

.ulsf-filter--vertical .ulsf-filter__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    margin: 0;
}

.ulsf-filter--vertical .ulsf-filter__body {
    padding: 0;
}

.ulsf-filter--vertical .ulsf-filter-group {
    border-bottom: 1px solid var(--ulsf-border);
}

.ulsf-filter--vertical .ulsf-filter-group:last-child {
    border-bottom: none;
}

.ulsf-filter--vertical .ulsf-filter-group__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    cursor: pointer;
    transition: background var(--ulsf-transition);
    user-select: none;
}

.ulsf-filter--vertical .ulsf-filter-group__header:hover {
    background: var(--ulsf-bg-hover);
}

.ulsf-filter--vertical .ulsf-filter-group__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

.ulsf-filter--vertical .ulsf-filter-group.ulsf-filter-group--open .ulsf-filter-group__content {
    max-height: 500px;
    overflow-y: auto;
    padding: 0 20px 16px 20px;
}

.ulsf-filter--vertical .ulsf-filter__footer {
    display: flex;
    gap: 8px;
    padding: 16px 20px;
    border-top: 1px solid var(--ulsf-border);
}

.ulsf-filter--vertical .ulsf-active-filters {
    padding: 0 20px 12px 20px;
}

/* ============================================================
   LAYOUT: OFF-CANVAS (Drawer)
   ============================================================ */
.ulsf-filter--offcanvas {
    position: fixed;
    top: 0;
    bottom: 0;
    width: var(--ulsf-offcanvas-width);
    max-width: 90vw;
    background: var(--ulsf-bg);
    z-index: 99999;
    display: flex;
    flex-direction: column;
    box-shadow: var(--ulsf-shadow-lg);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

/* Vị trí: Trái */
.ulsf-filter--offcanvas.ulsf-offcanvas--left {
    left: 0;
    transform: translateX(-100%);
}

.ulsf-filter--offcanvas.ulsf-offcanvas--left.ulsf-offcanvas--open {
    transform: translateX(0);
}

/* Vị trí: Phải */
.ulsf-filter--offcanvas.ulsf-offcanvas--right {
    right: 0;
    transform: translateX(100%);
}

.ulsf-filter--offcanvas.ulsf-offcanvas--right.ulsf-offcanvas--open {
    transform: translateX(0);
}

/* Off-canvas Header */
.ulsf-filter--offcanvas .ulsf-filter__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    background: linear-gradient(135deg, var(--ulsf-primary), var(--ulsf-primary-hover));
    color: #fff;
    flex-shrink: 0;
}

.ulsf-filter--offcanvas .ulsf-filter__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

.ulsf-filter--offcanvas .ulsf-filter__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: var(--ulsf-radius-full);
    color: #fff;
    cursor: pointer;
    transition: background var(--ulsf-transition);
}

.ulsf-filter--offcanvas .ulsf-filter__close:hover {
    background: rgba(255, 255, 255, 0.35);
}

/* Off-canvas Body */
.ulsf-filter--offcanvas .ulsf-filter__body {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 0;
}

.ulsf-filter--offcanvas .ulsf-filter-group {
    border-bottom: 1px solid var(--ulsf-border);
}

.ulsf-filter--offcanvas .ulsf-filter-group__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    cursor: pointer;
    transition: background var(--ulsf-transition);
    user-select: none;
}

.ulsf-filter--offcanvas .ulsf-filter-group__header:hover {
    background: var(--ulsf-bg-hover);
}

.ulsf-filter--offcanvas .ulsf-filter-group__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

.ulsf-filter--offcanvas .ulsf-filter-group.ulsf-filter-group--open .ulsf-filter-group__content {
    max-height: 500px;
    overflow-y: auto;
    padding: 0 20px 16px 20px;
}

/* Off-canvas Footer */
.ulsf-filter--offcanvas .ulsf-filter__footer {
    display: flex;
    gap: 8px;
    padding: 16px 20px;
    border-top: 1px solid var(--ulsf-border);
    background: var(--ulsf-bg-hover);
    flex-shrink: 0;
}

.ulsf-filter--offcanvas .ulsf-active-filters {
    padding: 0 20px 12px 20px;
}

/* ============================================================
   Filter Group Common
   ============================================================ */
.ulsf-filter-group__title {
    font-size: 13px;
    font-weight: 600;
    color: var(--ulsf-text);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin: 0;
}

.ulsf-filter-group__arrow {
    display: flex;
    transition: transform var(--ulsf-transition);
    color: var(--ulsf-text-muted);
}

.ulsf-filter-group--open .ulsf-filter-group__arrow {
    transform: rotate(180deg);
}

/* ============================================================
   Range Slider (Dual Thumb)
   ============================================================ */
.ulsf-range-slider {
    position: relative;
    width: 100%;
    height: 36px;
    margin-bottom: 8px;
}

.ulsf-range-slider__track {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 5px;
    background: var(--ulsf-border);
    border-radius: 3px;
    transform: translateY(-50%);
}

.ulsf-range-slider__fill {
    position: absolute;
    height: 100%;
    background: linear-gradient(90deg, var(--ulsf-primary), var(--ulsf-primary-hover));
    border-radius: 3px;
    transition: none;
}

.ulsf-range-slider__input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    pointer-events: none;
    outline: none;
    margin: 0;
}

/* Thumb: WebKit */
.ulsf-range-slider__input::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 20px;
    width: 20px;
    border-radius: var(--ulsf-radius-full);
    background: var(--ulsf-bg);
    border: 2.5px solid var(--ulsf-primary);
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.3);
    cursor: pointer;
    pointer-events: auto;
    margin: 0 !important; /* Override WooCommerce negative margin */
    padding: 0 !important;
    box-sizing: border-box;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.ulsf-range-slider__input::-webkit-slider-thumb:hover {
    transform: translateY(-50%) scale(1.2);
    box-shadow: 0 3px 10px rgba(79, 70, 229, 0.4);
}

.ulsf-range-slider__input::-webkit-slider-thumb:active {
    transform: translateY(-50%) scale(1.15);
}

/* Thumb: Mozilla */
.ulsf-range-slider__input::-moz-range-thumb {
    height: 18px;
    width: 18px;
    border-radius: var(--ulsf-radius-full);
    background: var(--ulsf-bg);
    border: 2.5px solid var(--ulsf-primary);
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.3);
    cursor: pointer;
    pointer-events: auto;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box;
    transform: translateY(0);
}

.ulsf-range-slider__input::-moz-range-track {
    background: transparent;
    border: none;
}

/* ============================================================
   Price Inputs
   ============================================================ */
.ulsf-price-inputs {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    margin-top: 4px;
}

.ulsf-price-input {
    flex: 1;
}

.ulsf-price-input label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--ulsf-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.ulsf-price-input__wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.ulsf-price-input__wrap input {
    width: 100%;
    padding: 8px 30px 8px 10px;
    border: 1.5px solid var(--ulsf-border);
    border-radius: var(--ulsf-radius-sm);
    font-size: 13px;
    font-family: var(--ulsf-font);
    color: var(--ulsf-text);
    background: var(--ulsf-bg);
    outline: none;
    transition: border-color var(--ulsf-transition);
    -moz-appearance: textfield;
}

.ulsf-price-input__wrap input::-webkit-outer-spin-button,
.ulsf-price-input__wrap input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.ulsf-price-input__wrap input:focus {
    border-color: var(--ulsf-border-focus);
    box-shadow: 0 0 0 3px var(--ulsf-primary-alpha);
}

.ulsf-price-input__currency {
    position: absolute;
    right: 8px;
    font-size: 11px;
    font-weight: 600;
    color: var(--ulsf-text-muted);
    pointer-events: none;
}

.ulsf-price-separator {
    color: var(--ulsf-text-muted);
    font-size: 16px;
    padding-bottom: 6px;
}

/* ============================================================
   Checkbox List (Category, Brand)
   ============================================================ */
.ulsf-checkbox-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.ulsf-checkbox-item {
    margin-bottom: 2px;
}

.ulsf-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 8px;
    border-radius: var(--ulsf-radius-sm);
    cursor: pointer;
    transition: background var(--ulsf-transition);
}

.ulsf-checkbox:hover {
    background: var(--ulsf-bg-hover);
}

.ulsf-checkbox input[type="checkbox"] {
    display: none;
}

.ulsf-checkbox__mark {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    border: 2px solid var(--ulsf-border);
    border-radius: 4px;
    transition: all var(--ulsf-transition);
    position: relative;
    background: var(--ulsf-bg);
}

.ulsf-checkbox input[type="checkbox"]:checked ~ .ulsf-checkbox__mark {
    background: var(--ulsf-primary);
    border-color: var(--ulsf-primary);
}

.ulsf-checkbox input[type="checkbox"]:checked ~ .ulsf-checkbox__mark::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 5px;
    height: 9px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.ulsf-checkbox__label {
    flex: 1;
    font-size: 13px;
    color: var(--ulsf-text);
}

.ulsf-checkbox__count {
    font-size: 11px;
    color: var(--ulsf-text-muted);
    background: var(--ulsf-bg-hover);
    padding: 2px 7px;
    border-radius: 10px;
    font-weight: 500;
}

/* ============================================================
   Color Swatches
   ============================================================ */
.ulsf-color-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ulsf-color-swatch {
    position: relative;
    width: 34px;
    height: 34px;
    border-radius: var(--ulsf-radius-full);
    padding: 3px;
    border: 2px solid transparent;
    cursor: pointer;
    background: transparent;
    transition: all var(--ulsf-transition);
}

.ulsf-color-swatch:hover {
    transform: scale(1.15);
}

.ulsf-color-swatch__inner {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: var(--ulsf-radius-full);
    background: var(--swatch-color, #CBD5E0);
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1);
}

/* Selected state */
.ulsf-color-swatch--active {
    border-color: var(--ulsf-primary);
    box-shadow: 0 0 0 2px var(--ulsf-primary-alpha);
}

.ulsf-color-swatch__check {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    color: #fff;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.5));
}

.ulsf-color-swatch--active .ulsf-color-swatch__check {
    display: flex;
}

/* Text-only Swatch (Pill Button) */
.ulsf-color-swatch--text-only {
    width: auto;
    height: auto;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--ulsf-border);
    color: var(--ulsf-text);
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
}

.ulsf-color-swatch--text-only:hover {
    transform: none;
    background: var(--ulsf-bg-hover);
    border-color: var(--ulsf-text-muted);
}

.ulsf-color-swatch--text-only.ulsf-color-swatch--active {
    background: var(--ulsf-primary);
    color: #fff;
    border-color: var(--ulsf-primary);
    transform: none;
    box-shadow: none;
}

.ulsf-color-swatch__name {
    display: inline-block;
}

.ulsf-color-swatch--text-only .ulsf-color-swatch__check {
    display: none !important; /* Hide checkmark on pill buttons */
}

/* ============================================================
   Buttons
   ============================================================ */
.ulsf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border: none;
    border-radius: var(--ulsf-radius);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--ulsf-transition);
    font-family: var(--ulsf-font);
    white-space: nowrap;
    text-decoration: none;
}

.ulsf-btn--primary {
    background: linear-gradient(135deg, var(--ulsf-primary), var(--ulsf-primary-hover));
    color: #fff;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.ulsf-btn--primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
}

.ulsf-btn--primary:active {
    transform: translateY(0);
}

.ulsf-btn--ghost {
    background: transparent;
    color: var(--ulsf-text-secondary);
    border: 1.5px solid var(--ulsf-border);
}

.ulsf-btn--ghost:hover {
    border-color: var(--ulsf-danger);
    color: var(--ulsf-danger);
    background: rgba(239, 68, 68, 0.05);
}

/* Sizing variants */
.ulsf-filter--horizontal .ulsf-btn {
    padding: 8px 14px;
    font-size: 12px;
}

.ulsf-filter--vertical .ulsf-btn,
.ulsf-filter--offcanvas .ulsf-btn {
    flex: 1;
}

/* ============================================================
   Active Filter Tags
   ============================================================ */
.ulsf-active-filters {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

.ulsf-active-filters__label {
    font-size: 12px;
    color: var(--ulsf-text-muted);
    font-weight: 500;
}

.ulsf-active-filters__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.ulsf-active-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    background: var(--ulsf-primary-light);
    color: var(--ulsf-primary);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--ulsf-transition);
    border: none;
    font-family: var(--ulsf-font);
}

.ulsf-active-tag:hover {
    background: var(--ulsf-primary);
    color: #fff;
}

.ulsf-active-tag__remove {
    font-size: 14px;
    line-height: 1;
}

/* ============================================================
   Loading / Skeleton
   ============================================================ */
.ulsf-products-loading {
    position: relative;
    opacity: 0.4;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.ulsf-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99997;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

/* Positioned overlay - used when targeting product container */
.ulsf-loading-overlay--positioned {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.ulsf-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px 32px;
    background: var(--ulsf-bg);
    border-radius: var(--ulsf-radius);
    box-shadow: var(--ulsf-shadow-lg);
    pointer-events: auto;
}

.ulsf-spinner__ring {
    width: 36px;
    height: 36px;
    border: 3px solid var(--ulsf-border);
    border-top-color: var(--ulsf-primary);
    border-radius: var(--ulsf-radius-full);
    animation: ulsf-spin 0.7s linear infinite;
}

.ulsf-spinner span {
    font-size: 12px;
    color: var(--ulsf-text-muted);
    font-weight: 500;
}

@keyframes ulsf-spin {
    to { transform: rotate(360deg); }
}

/* ============================================================
   No Results
   ============================================================ */
.ulsf-no-results {
    text-align: center;
    padding: 48px 20px;
}

.ulsf-no-results__icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.6;
}

.ulsf-no-results__text {
    font-size: 16px;
    font-weight: 600;
    color: var(--ulsf-text);
    margin-bottom: 6px;
}

.ulsf-no-results__hint {
    font-size: 13px;
    color: var(--ulsf-text-muted);
}

/* ============================================================
   RESPONSIVE: Auto Off-canvas trên Mobile
   ============================================================ */
@media (max-width: 768px) {
    /* Hiện mobile toggle cho horizontal & vertical */
    .ulsf-mobile-toggle {
        display: inline-flex;
    }

    /* Chuyển horizontal & vertical thành off-canvas */
    .ulsf-filter--horizontal,
    .ulsf-filter--vertical {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: var(--ulsf-offcanvas-width);
        max-width: 90vw;
        z-index: 99999;
        flex-direction: column;
        box-shadow: var(--ulsf-shadow-lg);
        transform: translateX(-100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        border: none;
        border-radius: 0;
        margin: 0;
        padding: 0;
        overflow: hidden;
    }

    .ulsf-filter--horizontal.ulsf-offcanvas--open,
    .ulsf-filter--vertical.ulsf-offcanvas--open {
        transform: translateX(0);
    }

    /* Hiện header trên mobile */
    .ulsf-filter--horizontal .ulsf-filter__header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 20px;
        background: linear-gradient(135deg, var(--ulsf-primary), var(--ulsf-primary-hover));
        color: #fff;
        flex-shrink: 0;
    }

    .ulsf-filter--horizontal .ulsf-filter__title {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 16px;
        font-weight: 600;
        margin: 0;
    }

    .ulsf-filter--horizontal .ulsf-filter__close {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 34px;
        height: 34px;
        background: rgba(255, 255, 255, 0.2);
        border: none;
        border-radius: var(--ulsf-radius-full);
        color: #fff;
        cursor: pointer;
    }

    /* Body scroll */
    .ulsf-filter--horizontal .ulsf-filter__body {
        flex: 1;
        flex-direction: column;
        overflow-y: auto;
        overscroll-behavior: contain;
        gap: 0;
    }

    .ulsf-filter--horizontal .ulsf-filter-group {
        flex: 0 0 auto;
        border-bottom: 1px solid var(--ulsf-border);
    }

    .ulsf-filter--horizontal .ulsf-filter-group__header {
        justify-content: space-between;
        padding: 14px 20px;
        background: none;
        border: none;
        border-radius: 0;
    }

    .ulsf-filter--horizontal .ulsf-filter-group__content {
        position: static;
        min-width: auto;
        box-shadow: none;
        border: none;
        border-radius: 0;
        transform: none;
    }

    .ulsf-filter--horizontal .ulsf-filter-group.ulsf-filter-group--open .ulsf-filter-group__content {
        padding: 0 20px 16px 20px;
    }

    /* Footer */
    .ulsf-filter--horizontal .ulsf-filter__footer {
        flex-shrink: 0;
        padding: 16px 20px;
        border-top: 1px solid var(--ulsf-border);
        background: var(--ulsf-bg-hover);
    }

    .ulsf-filter--horizontal .ulsf-btn,
    .ulsf-filter--vertical .ulsf-btn {
        flex: 1;
        padding: 10px 16px;
        font-size: 13px;
    }
}

/* ============================================================
   Pagination AJAX Enhancement
   ============================================================ */
.ulsf-pagination ul {
    display: flex;
    gap: 4px;
    list-style: none;
    padding: 0;
    margin: 20px 0;
    justify-content: center;
}

.ulsf-pagination ul li a,
.ulsf-pagination ul li span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border: 1.5px solid var(--ulsf-border);
    border-radius: var(--ulsf-radius-sm);
    font-size: 13px;
    color: var(--ulsf-text);
    text-decoration: none;
    transition: all var(--ulsf-transition);
}

.ulsf-pagination ul li a:hover {
    border-color: var(--ulsf-primary);
    color: var(--ulsf-primary);
    background: var(--ulsf-primary-alpha);
}

.ulsf-pagination ul li span.current {
    background: var(--ulsf-primary);
    border-color: var(--ulsf-primary);
    color: #fff;
    font-weight: 600;
}

/* ============================================================
   Scroll to top animation
   ============================================================ */
.ulsf-scroll-target {
    scroll-margin-top: 20px;
}

/* ============================================================
   Subtle entrance animation
   ============================================================ */
@keyframes ulsf-fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ulsf-filter--horizontal,
.ulsf-filter--vertical {
    animation: ulsf-fadeInUp 0.4s ease forwards;
}