/* =====================================================
   UNIVERSAL FILTER SYSTEM - Premium Platform Level
   ===================================================== */

/* Filter Categories Section */
.filter-categories {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--white) 100%);
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.filter-categories::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-shadow), transparent);
}

.filter-categories-wrapper {
    display: flex;
    gap: 1rem;
    padding: 0 1rem;
    position: relative;
    overflow-x: auto;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    justify-content: flex-start;
    align-items: center;
    flex-wrap: nowrap;
}

.filter-categories-wrapper::-webkit-scrollbar {
    display: none;
}

/* Filter Buttons - Premium Platform Style */
.filter-btn {
    padding: 0.875rem 1.75rem;
    border: 2px solid var(--border-light);
    border-radius: 50px;
    background: linear-gradient(135deg, var(--white) 0%, var(--bg-light) 100%);
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: flex;
    align-items: center;
    gap: 0.625rem;
    white-space: nowrap;
    user-select: none;
    flex-shrink: 0;
    position: relative;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.4));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.filter-btn:hover {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.filter-btn:hover::before {
    opacity: 1;
}

.filter-btn.active {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--primary-shadow);
}

.filter-btn .filter-icon {
    font-size: 1rem;
}

.filter-btn .filter-count {
    background: var(--white-overlay);
    color: var(--white);
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    margin-left: 0.25rem;
}

.filter-btn:not(.active) .filter-count {
    background: var(--primary-color);
    color: var(--white);
}

/* Auto-scroll Animation */
@keyframes autoScroll {
    0% { transform: translateX(0); }
    25% { transform: translateX(-20%); }
    50% { transform: translateX(-40%); }
    75% { transform: translateX(-60%); }
    100% { transform: translateX(0); }
}

.filter-categories-wrapper.auto-scrolling {
    animation: autoScroll 15s ease-in-out infinite;
    animation-play-state: running;
}

.filter-categories-wrapper.auto-scrolling:hover {
    animation-play-state: paused;
}

/* Desktop & Large Tablets - Center Alignment */
@media (min-width: 1025px) {
    .filter-categories-wrapper {
        justify-content: center;
        flex-wrap: wrap;
        overflow-x: visible;
    }
}

/* Medium Tablets - Flex start but still center if space allows */
@media (max-width: 1024px) and (min-width: 769px) {
    .filter-categories-wrapper {
        justify-content: flex-start;
        padding: 0 1.5rem;
        overflow-x: auto;
    }
    
    .filter-btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
        flex-shrink: 0;
    }
}

@media (max-width: 768px) {
    .filter-categories {
        padding: 1.75rem 0;
        background: linear-gradient(135deg, #f8faff 0%, #ffffff 100%);
    }
    
    .filter-categories-wrapper {
        padding: 0 1rem;
        gap: 0.875rem;
        animation: autoScroll 20s linear infinite;
    }
    
    .filter-categories-wrapper:hover {
        animation-play-state: paused;
    }
    
    .filter-btn {
        flex-shrink: 0;
        padding: 0.625rem 1.25rem;
        font-size: 0.825rem;
        min-width: max-content;
    }
    
    .filter-btn .filter-icon {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .filter-categories {
        padding: 1.5rem 0;
    }
    
    .filter-categories-wrapper {
        padding: 0 0.75rem;
        gap: 0.75rem;
        animation: autoScroll 25s linear infinite;
    }
    
    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
        gap: 0.4rem;
        min-width: max-content;
    }
    
    .filter-btn .filter-icon {
        font-size: 0.85rem;
    }
    
    .filter-btn .filter-count {
        font-size: 0.7rem;
        padding: 0.15rem 0.4rem;
    }
}

/* Premium Touch Interactions */
.filter-btn:active {
    transform: translateY(0) scale(0.98);
    transition-duration: 0.1s;
}

/* Smooth scroll behavior for all devices */
.filter-categories-wrapper {
    scroll-snap-type: x mandatory;
}

.filter-btn {
    scroll-snap-align: center;
}

/* Enhanced visual feedback */
.filter-btn:focus {
    outline: 2px solid rgba(0, 102, 204, 0.4);
    outline-offset: 2px;
}

/* Premium loading state */
.filter-btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.filter-btn.loading::after {
    content: '';
    width: 12px;
    height: 12px;
    border: 2px solid currentColor;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
}

/* Filter Results Info */
.filter-results {
    background: var(--bg-light);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.filter-results-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-light);
}

.results-count {
    font-weight: 600;
    color: var(--primary-color);
}

.results-sort {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sort-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: white;
    color: var(--text-light);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sort-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Filter Animation */
.filter-fade-in {
    animation: filterFadeIn 0.4s ease forwards;
}

.filter-fade-out {
    animation: filterFadeOut 0.3s ease forwards;
}

@keyframes filterFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes filterFadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* Clear Filters Button */
.clear-filters-btn {
    padding: 0.6rem 1.2rem;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.clear-filters-btn:hover {
    background: #e8f0fe;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Filter Loading State */
.filter-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    color: var(--text-light);
}

.filter-loading .spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.75rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* =====================================================
   MOBILE RESPONSIVE FILTERS - Touch-Optimized
   ===================================================== */

/* Mobile Tablets (768px and below) */
@media (max-width: 768px) {
    .filter-categories {
        padding: 1.5rem 0;
    }
    
    .filter-categories-wrapper {
        padding: 0 1rem;
        gap: 0.75rem;
        justify-content: flex-start;
    }
    
    .filter-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.85rem;
        min-width: auto;
        white-space: nowrap;
        border-radius: 25px;
    }
    
    .filter-count {
        font-size: 0.7rem;
        min-width: 18px;
        height: 18px;
        line-height: 18px;
    }
    
}

/* Small Mobile (480px and below) */
@media (max-width: 480px) {
    .filter-categories {
        padding: 1rem 0;
    }
    
    .filter-categories-wrapper {
        padding: 0 0.75rem;
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 0.65rem 1rem;
        font-size: 0.8rem;
        border-radius: 20px;
    }
    
    .filter-icon {
        font-size: 0.9rem;
    }
    
    .filter-count {
        font-size: 0.65rem;
        min-width: 16px;
        height: 16px;
        line-height: 16px;
    }
    
}

/* Extra Small Mobile (360px and below) */
@media (max-width: 360px) {
    .filter-categories-wrapper {
        padding: 0 0.5rem;
        gap: 0.4rem;
    }
    
    .filter-btn {
        padding: 0.55rem 0.85rem;
        font-size: 0.75rem;
        border-radius: 18px;
    }
    
    .filter-count {
        font-size: 0.6rem;
        min-width: 14px;
        height: 14px;
        line-height: 14px;
    }
    
}