/**
 * Modern Specification Filter Styles
 * Uses unified filter design system
 * Collapsible specification filters with checkboxes
 */

.modern-specification-filter {
    background: var(--filter-bg);
    border-radius: var(--filter-border-radius);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    margin-bottom: 20px;
}

/* Filter Header - Using unified gradient and animations */
.spec-filter-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: var(--filter-header-padding);
    background: var(--gradient-specs);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    position: relative;
    overflow: hidden;
}

/* Grid pattern overlay */
.spec-filter-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 10px 10px;
    pointer-events: none;
}

.spec-filter-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transition: left 0.5s ease;
    z-index: 1;
}

.spec-filter-header:hover::before {
    left: 100%;
}

.spec-filter-header:hover {
    filter: brightness(1.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* Ensure content is above overlays */
.spec-filter-header > * {
    position: relative;
    z-index: 2;
}

.spec-filter-icon {
    font-size: 17px;
    flex-shrink: 0;
    opacity: 0.95;
}

.spec-filter-title {
    flex: 1;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.8px;
}

.spec-filter-chevron {
    font-size: 13px;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    opacity: 0.9;
}

/* Collapsible content */
.spec-filter-content {
    display: none;
}

.spec-filter-content.expanded {
    display: block;
}

/* Specification Section - Uses unified design */
.specification-filter-section {
    border-bottom: 1px solid #f0f2f5;
    transition: background-color 0.2s ease;
}

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

.specification-filter-section:hover {
    background-color: var(--filter-hover-bg);
}

/* Specification Header (Clickable) - Uses unified design */
.spec-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px var(--filter-spacing);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.spec-header:hover {
    background-color: #f0f2f5;
}

.spec-icon {
    color: var(--filter-accent-blue);
    font-size: 16px;
    transition: color 0.2s ease;
    flex-shrink: 0;
}

.spec-header:hover .spec-icon {
    color: var(--filter-accent-purple);
}

.spec-name {
    flex: 1;
    font-weight: 600;
    font-size: 14px;
    color: var(--filter-text-primary);
}

.spec-count {
    color: var(--filter-text-muted);
    font-size: 11px;
    font-weight: 600;
    background: #f0f2f5;
    padding: 3px 8px;
    border-radius: 10px;
    line-height: 1;
}

.spec-chevron {
    color: var(--filter-text-muted);
    font-size: 14px;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.specification-filter-section.expanded .spec-chevron {
    transform: rotate(180deg);
}

/* Specification Values (Checkboxes) - Uses unified design */
.spec-values {
    display: none;
    padding: 8px var(--filter-spacing) 15px 45px;
    background-color: #fafbfc;
}

.spec-value-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    transition: all 0.2s ease;
    border-bottom: 1px solid #f5f7fa;
}

.spec-value-item:last-child {
    border-bottom: none;
}

.spec-value-item:hover {
    padding-left: 5px;
}

.spec-value-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    border: 2px solid #cbd0dd;
    border-radius: 4px;
    flex-shrink: 0;
}

.spec-value-item input[type="checkbox"]:hover {
    border-color: var(--filter-accent-blue);
}

.spec-value-item label {
    cursor: pointer;
    font-size: 14px;
    color: var(--filter-text-secondary);
    margin: 0;
    transition: all 0.2s ease;
    flex: 1;
}

.spec-value-item:hover label {
    color: var(--filter-text-primary);
    font-weight: 500;
}

.spec-value-item input[type="checkbox"]:checked + label {
    font-weight: 600;
}

/* Loading State - Uses unified design */
.spec-loading {
    padding: 20px;
    text-align: center;
    color: var(--filter-text-muted);
    font-size: 14px;
}

.spec-loading i {
    margin-right: 8px;
}

/* Empty State - Uses unified design */
.spec-empty {
    padding: 20px;
    text-align: center;
    color: var(--filter-text-muted);
    font-size: 14px;
}

/* Responsive Adjustments - Uses unified design */
@media only screen and (max-width: 991px) {
    .spec-name {
        font-size: 13px;
    }

    .spec-values {
        padding-left: 35px;
    }
    
    .spec-value-item {
        font-size: 13px;
    }
}

@media only screen and (max-width: 767px) {
    .spec-name {
        font-size: 12px;
    }

    .spec-count {
        font-size: 10px;
        padding: 2px 6px;
    }

    .spec-values {
        padding-left: 32px;
    }

    .spec-value-item {
        font-size: 12px;
    }
}

/* Animation for sliding values */
@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 500px;
    }
}

.specification-filter-section.expanded .spec-values {
    animation: slideDown 0.3s ease-out;
}