/**
 * MOBILE-FIRST CSS - СНИКЕРХЭД
 * Оптимизирована для всех устройств, начиная с мобильных
 */

/* ============================================
   1. RESET & BASE (Mobile First)
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    /* Colors */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --dark: #111827;
    --gray: #6b7280;
    --gray-light: #f3f4f6;
    --white: #ffffff;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    
    /* Typography */
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Inter', sans-serif;
    
    /* Animation */
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.5;
    color: var(--dark);
    background: var(--gray-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   2. HEADER (Mobile First) - УНИФИЦИРОВАННЫЙ
   ============================================ */

.catalog-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-light);
}

.catalog-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 100%;
    gap: var(--spacing-md);
}

/* Стили для .ecom-header управляются в layouts/public.php */

/* Унифицированный logo */
.catalog-header .logo,
.ecom-header .logo,
.logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Одинаковые кнопки header - только для .catalog-header */
.catalog-header .back-btn,
.catalog-header .favorites,
.catalog-header .header-btn {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    border: none;
    background: var(--gray-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.catalog-header .back-btn:active,
.catalog-header .favorites:active,
.catalog-header .header-btn:active {
    transform: scale(0.95);
    background: var(--gray);
    color: var(--white);
}

/* Badge для счётчиков - только для .catalog-header */
.catalog-header .header-btn .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger);
    color: var(--white);
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
    line-height: 1;
}

/* ============================================
   3. BREADCRUMBS (Mobile)
   ============================================ */

.breadcrumbs-nav {
    background: var(--white);
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    list-style: none;
    white-space: nowrap;
    padding: 0 var(--spacing-md);
}

.breadcrumbs li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.breadcrumbs a {
    color: var(--gray);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
}

.breadcrumbs .active {
    color: var(--dark);
    font-weight: 500;
}

/* ============================================
   4. CATALOG LAYOUT (Mobile First)
   ============================================ */

.catalog-layout {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-md);
}

/* ============================================
   5. FILTERS SIDEBAR (Mobile)
   ============================================ */

/* Mobile: Фильтры в overlay */
.sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: 90%;
    max-width: 380px;
    height: 100vh;
    background: var(--white);
    z-index: 1000;
    overflow-y: auto;
    transition: left var(--transition-slow);
    box-shadow: var(--shadow-xl);
}

.sidebar.open {
    left: 0;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-light);
    position: sticky;
    top: 0;
    background: var(--white);
    z-index: 10;
}

.sidebar-header h3 {
    font-size: 20px;
    font-weight: 600;
}

.close-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--gray-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:active {
    transform: scale(0.9);
    background: var(--gray);
    color: var(--white);
}

/* Sticky filters button (mobile) */
.filters-sticky-btn {
    position: fixed;
    bottom: 80px;
    right: var(--spacing-md);
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    z-index: 100;
    cursor: pointer;
    transition: var(--transition);
}

.filters-sticky-btn:active {
    transform: scale(0.95);
}

.filters-sticky-btn .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger);
    color: var(--white);
    font-size: 11px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

/* Filter groups */
.filter-group {
    border-bottom: 1px solid var(--gray-light);
}

.filter-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.filter-title:active {
    background: var(--gray-light);
}

.filter-title span {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-title i.bi-chevron-down {
    transition: transform var(--transition);
}

.filter-group.open .filter-title i.bi-chevron-down {
    transform: rotate(180deg);
}

.filter-content {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    display: none;
}

.filter-group.open .filter-content {
    display: block;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.filter-item:active {
    background: var(--gray-light);
}

.filter-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

.filter-item .count {
    margin-left: auto;
    font-size: 12px;
    color: var(--gray);
    background: var(--gray-light);
    padding: 2px 8px;
    border-radius: 12px;
}

.filter-item.disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* ============================================
   6. PRODUCTS GRID (Mobile First)
   ============================================ */

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
}

/* ПРИМЕЧАНИЕ: Стили .product-card перенесены в catalog-card.css
   для избежания дублирования и конфликтов.
   Используйте catalog-card.css на страницах с карточками товаров. */

/* ============================================
   7. SKELETON LOADER (Mobile)
   ============================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--gray-light) 0%,
        #e5e7eb 50%,
        var(--gray-light) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.product-card-skeleton {
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.skeleton-image {
    width: 100%;
    aspect-ratio: 1;
}

.skeleton-body {
    padding: var(--spacing-md);
}

.skeleton-line {
    height: 12px;
    border-radius: 6px;
    margin-bottom: var(--spacing-sm);
}

.skeleton-line.short {
    width: 60%;
}

.skeleton-line.long {
    width: 100%;
}

/* ============================================
   8. INFINITE SCROLL LOADER
   ============================================ */

.infinite-scroll-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   9. PRODUCT PAGE (Mobile First)
   ============================================ */

.product-gallery-swipe {
    position: relative;
    width: 100%;
    min-height: 240px;
    overflow: hidden;
    touch-action: pan-y;
    background: var(--gray-light);
}

.product-gallery-track {
    display: flex;
    height: 100%;
    transition: transform var(--transition);
}

.product-gallery-swipe.swiping .product-gallery-track {
    transition: none;
}

.product-gallery-slide {
    flex: 0 0 100%;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-gallery-slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Gallery pagination */
.product-gallery-pagination {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 20px;
}

.gallery-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.gallery-dot.active {
    background: var(--white);
    width: 24px;
    border-radius: 4px;
}

/* Collapsible характеристики */
.specs-section {
    background: var(--white);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    overflow: hidden;
}

.specs-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.specs-header:active {
    background: var(--gray-light);
}

.specs-header h3 {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.specs-header i.toggle-icon {
    transition: transform var(--transition);
}

.specs-section.open .specs-header i.toggle-icon {
    transform: rotate(180deg);
}

.specs-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.specs-section.open .specs-content {
    max-height: 1000px;
}

.specs-list {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.spec-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--gray-light);
}

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

.spec-label {
    color: var(--gray);
    font-size: 14px;
}

.spec-value {
    font-weight: 500;
    text-align: right;
}

/* ============================================
   10. TABLET (768px+)
   ============================================ */

@media (min-width: 768px) {
    body {
        font-size: 15px;
    }
    
    .catalog-layout {
        flex-direction: row;
        padding: 0 var(--spacing-lg);
    }
    
    .sidebar {
        position: static;
        width: 280px;
        height: auto;
        max-width: none;
        box-shadow: none;
        border-radius: var(--radius-md);
        overflow-y: visible;
    }
    
    .sidebar-overlay {
        display: none;
    }
    
    .filters-sticky-btn {
        display: none;
    }
    
    /* Close button видим всегда (на desktop тоже полезен) */
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: var(--spacing-lg);
    }
    
    .product-gallery-swipe {
        min-height: 350px;
    }
}

/* ============================================
   11. DESKTOP (1024px+)
   ============================================ */

@media (min-width: 1024px) {
    /* Container управляется через container-system.css (1400px) */
    
    /* Header container на desktop - управляется через container-system.css */
    /* Удалены переопределения width и max-width для единообразия */
    
    .catalog-layout {
        gap: var(--spacing-xl);
    }
    
    .sidebar {
        width: 320px;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
    
    .product-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lg);
    }
    
    .product-gallery-swipe {
        min-height: 400px;
    }
    
    .specs-section {
        margin-top: var(--spacing-lg);
    }
}

/* ============================================
   12. UTILITY CLASSES
   ============================================ */

.container {
    width: 100%;
    padding: 0 var(--spacing-md);
}

.hide-mobile {
    display: none !important;
}

@media (min-width: 768px) {
    .hide-tablet {
        display: none !important;
    }
    
    .hide-mobile {
        display: block !important;
    }
    
    .show-mobile-only {
        display: none !important;
    }
}

.text-center {
    text-align: center;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }