/**
 * Unified Filter Design System
 * Consistent styling for all sidebar filters
 */

/* Common Variables (via CSS custom properties) */
:root {
    --filter-border-radius: 8px;
    --filter-spacing: 15px;
    --filter-header-padding: 14px 16px;
    --filter-item-padding: 11px 16px;
    
    /* Colors - Harmonized palette */
    --filter-bg: #ffffff;
    --filter-border: #e4e7ed;
    --filter-hover-bg: #f8f9fa;
    --filter-active-bg: #e8eef8;
    
    /* Text - Consistent typography */
    --filter-text-primary: #2b2d42;
    --filter-text-secondary: #5a6c7d;
    --filter-text-muted: #8d99ae;
    
    /* Accents - Unified color scheme */
    --filter-accent-blue: #667eea;
    --filter-accent-purple: #764ba2;
    --filter-accent-pink: #D4145A;
    --filter-accent-orange: #FBB03B;
    --filter-accent-teal: #38b2ac;
    --filter-accent-indigo: #5a67d8;
    
    /* Gradients - Harmonious multi-tone gradients with depth */
    --gradient-categories: linear-gradient(135deg, #4a5f7f 0%, #2d3e57 50%, #1e2d42 100%);
    --gradient-brands: linear-gradient(135deg, #5a7fd7 0%, #4169d9 40%, #3355c7 100%);
    --gradient-price: linear-gradient(135deg, #6baef9 0%, #5592e8 50%, #4169b8 100%);
    --gradient-specs: linear-gradient(135deg, #7b8bf5 0%, #6674e3 50%, #5561c9 100%);
}

/* Base Filter Container */
.modern-filter-base {
    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;
}

/* Common Filter Header - Unified styling for all filters */
.filter-header-base {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: var(--filter-header-padding);
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

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

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

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

/* Header Icons - Consistent sizing */
.filter-icon-base {
    font-size: 17px;
    flex-shrink: 0;
    opacity: 0.95;
}

/* Header Title - Consistent font weight and size */
.filter-title-base {
    flex: 1;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.8px;
}

/* Badge Count - Uniform appearance across filters */
.filter-count-base {
    font-size: 10px;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.3);
    padding: 3px 7px;
    border-radius: 12px;
    line-height: 1;
    letter-spacing: 0.3px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Chevron Icon - Consistent sizing and animation */
.filter-chevron-base {
    font-size: 13px;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    opacity: 0.9;
}

/* Collapsible Content */
.filter-content-base {
    display: none;
    background: #fafbfc;
}

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

/* Filter Items */
.filter-item-base {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: var(--filter-item-padding);
    transition: all 0.2s ease;
    color: var(--filter-text-primary);
    font-size: 14px;
    border-bottom: 1px solid #f0f2f5;
}

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

.filter-item-base:hover {
    background: var(--filter-hover-bg);
    padding-left: 18px;
}

/* Checkboxes & Radio Buttons */
.filter-checkbox-base,
.filter-radio-base {
    width: 18px;
    height: 18px;
    cursor: pointer;
    border: 2px solid #cbd0dd;
    border-radius: 4px;
    flex-shrink: 0;
}

.filter-checkbox-base:hover,
.filter-radio-base:hover {
    border-color: var(--filter-accent-blue);
}

/* Labels */
.filter-label-base {
    cursor: pointer;
    font-size: 14px;
    color: var(--filter-text-secondary);
    margin: 0;
    transition: all 0.2s ease;
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.filter-checkbox-base:checked + .filter-label-base,
.filter-radio-base:checked + .filter-label-base {
    font-weight: 600;
}

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

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

/* Empty State */
.filter-empty-base {
    padding: 20px;
    text-align: center;
    color: var(--filter-text-muted);
    font-size: 13px;
}

/* Scrollable Content */
.filter-scrollable {
    max-height: 300px;
    overflow-y: auto;
}

.filter-scrollable::-webkit-scrollbar {
    width: 6px;
}

.filter-scrollable::-webkit-scrollbar-track {
    background: #f1f3f5;
    border-radius: 3px;
}

.filter-scrollable::-webkit-scrollbar-thumb {
    background: #cbd0dd;
    border-radius: 3px;
}

.filter-scrollable::-webkit-scrollbar-thumb:hover {
    background: var(--filter-accent-blue);
}

/* Responsive */
@media only screen and (max-width: 991px) {
    :root {
        --filter-header-padding: 12px;
        --filter-item-padding: 8px 12px;
    }
    
    .filter-title-base {
        font-size: 13px;
    }
    
    .filter-item-base {
        font-size: 13px;
    }
}

@media only screen and (max-width: 767px) {
    :root {
        --filter-header-padding: 10px;
        --filter-item-padding: 7px 10px;
    }
    
    .filter-title-base {
        font-size: 12px;
    }
    
    .filter-count-base {
        font-size: 10px;
        padding: 2px 6px;
    }
    
    .filter-item-base {
        font-size: 12px;
    }
}