/**
 * ═══════════════════════════════════════════════════════════════════════
 * UNIVERSAL RESPONSIVE E-COMMERCE DESIGN SYSTEM
 * ═══════════════════════════════════════════════════════════════════════
 * 
 * Purpose: Professional, fully responsive e-commerce system for 
 *          special-purpose clothing and footwear (spetsodej & spetsobuv)
 * 
 * Approach: Mobile-first, accessible, performance-optimized
 * Author: Senior Frontend Engineer & Professional UI/UX Designer
 * Version: 2.0.0
 * Last Updated: 2026-01-31
 * 
 * ═══════════════════════════════════════════════════════════════════════
 */

/* ═══════════════════════════════════════════════════════════════════════
   1. CSS CUSTOM PROPERTIES & DESIGN TOKENS
   ═══════════════════════════════════════════════════════════════════════ */

:root {
    /* ─────────────────────────────────────────────────────────────────
       RESPONSIVE BREAKPOINTS (Mobile-First)
       ───────────────────────────────────────────────────────────────── */
    --bp-mobile-sm: 320px;   /* Small phones */
    --bp-mobile: 480px;      /* Standard phones */
    --bp-tablet: 768px;      /* Tablets and large phones */
    --bp-laptop: 1024px;     /* Laptops */
    --bp-desktop: 1280px;    /* Desktop */
    --bp-large: 1440px;      /* Large screens */
    --bp-xlarge: 1920px;     /* Extra large screens */
    
    /* ─────────────────────────────────────────────────────────────────
       FLUID SPACING SCALE (Responsive)
       ───────────────────────────────────────────────────────────────── */
    --space-3xs: clamp(0.25rem, 0.5vw, 0.375rem);   /* 4-6px */
    --space-2xs: clamp(0.5rem, 1vw, 0.75rem);       /* 8-12px */
    --space-xs: clamp(0.75rem, 1.5vw, 1rem);        /* 12-16px */
    --space-sm: clamp(1rem, 2vw, 1.5rem);           /* 16-24px */
    --space-md: clamp(1.5rem, 3vw, 2rem);           /* 24-32px */
    --space-lg: clamp(2rem, 4vw, 3rem);             /* 32-48px */
    --space-xl: clamp(3rem, 6vw, 4rem);             /* 48-64px */
    --space-2xl: clamp(4rem, 8vw, 6rem);            /* 64-96px */
    --space-3xl: clamp(6rem, 12vw, 8rem);           /* 96-128px */
    
    /* ─────────────────────────────────────────────────────────────────
       FLUID TYPOGRAPHY SCALE
       ───────────────────────────────────────────────────────────────── */
    --text-xs: clamp(0.75rem, 1.5vw, 0.875rem);     /* 12-14px */
    --text-sm: clamp(0.875rem, 1.75vw, 1rem);       /* 14-16px */
    --text-base: clamp(1rem, 2vw, 1.125rem);        /* 16-18px */
    --text-lg: clamp(1.125rem, 2.25vw, 1.25rem);    /* 18-20px */
    --text-xl: clamp(1.25rem, 2.5vw, 1.5rem);       /* 20-24px */
    --text-2xl: clamp(1.5rem, 3vw, 2rem);           /* 24-32px */
    --text-3xl: clamp(2rem, 4vw, 2.5rem);           /* 32-40px */
    --text-4xl: clamp(2.5rem, 5vw, 3.5rem);         /* 40-56px */
    --text-5xl: clamp(3rem, 6vw, 4.5rem);           /* 48-72px */
    
    /* ─────────────────────────────────────────────────────────────────
       LAYOUT DIMENSIONS
       ───────────────────────────────────────────────────────────────── */
    --container-max: 1440px;
    --container-padding: clamp(1rem, 5vw, 2rem);
    --sidebar-width: clamp(240px, 20vw, 320px);
    --navbar-height: clamp(60px, 8vh, 80px);
    --footer-min-height: 400px;
    
    /* ─────────────────────────────────────────────────────────────────
       TOUCH TARGET SIZES (WCAG 2.1 AAA Compliance)
       ───────────────────────────────────────────────────────────────── */
    --touch-target-min: 44px;
    --touch-target-comfortable: 48px;
    --touch-target-large: 56px;
    
    /* ─────────────────────────────────────────────────────────────────
       GRID & LAYOUT
       ───────────────────────────────────────────────────────────────── */
    --grid-gap: clamp(1rem, 2vw, 1.5rem);
    --card-min-width: 280px;
    --card-max-width: 400px;
    
    /* ─────────────────────────────────────────────────────────────────
       Z-INDEX SCALE
       ───────────────────────────────────────────────────────────────── */
    --z-base: 1;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    
    /* ─────────────────────────────────────────────────────────────────
       TRANSITIONS & ANIMATIONS
       ───────────────────────────────────────────────────────────────── */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ═══════════════════════════════════════════════════════════════════════
   2. RESET & BASE STYLES
   ═══════════════════════════════════════════════════════════════════════ */

/* Box sizing reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Root font size - base for rem units */
html {
    font-size: 16px; /* Base size for desktop */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

/* Responsive root font scaling */
@media (max-width: 480px) {
    html { font-size: 14px; } /* Mobile */
}

@media (min-width: 1440px) {
    html { font-size: 18px; } /* Large screens */
}

/* Body defaults */
body {
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    font-family: var(--font-body, 'Inter', system-ui, -apple-system, sans-serif);
}

/* Prevent horizontal scroll */
html, body {
    max-width: 100%;
    overflow-x: hidden;
}

/* ═══════════════════════════════════════════════════════════════════════
   3. RESPONSIVE CONTAINER SYSTEM
   ═══════════════════════════════════════════════════════════════════════ */

.container,
.container-fluid {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.container {
    max-width: var(--container-max);
}

/* Responsive container widths */
@media (min-width: 768px) {
    .container { max-width: 720px; }
}

@media (min-width: 1024px) {
    .container { max-width: 960px; }
}

@media (min-width: 1280px) {
    .container { max-width: 1200px; }
}

@media (min-width: 1440px) {
    .container { max-width: var(--container-max); }
}

/* ═══════════════════════════════════════════════════════════════════════
   4. RESPONSIVE GRID SYSTEM (CSS Grid + Flexbox)
   ═══════════════════════════════════════════════════════════════════════ */

/* Product Grid - Auto-responsive */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, var(--card-min-width)), 1fr));
    gap: var(--grid-gap);
    width: 100%;
}

/* Responsive grid variations */
@media (min-width: 481px) {
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(min(48%, 240px), 1fr));
    }
}

@media (min-width: 769px) {
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(min(32%, 280px), 1fr));
    }
}

@media (min-width: 1025px) {
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(min(24%, 300px), 1fr));
    }
}

/* Flex Grid Alternative */
.flex-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--grid-gap);
    margin: calc(var(--grid-gap) * -0.5);
}

.flex-grid > * {
    flex: 1 1 100%;
    margin: calc(var(--grid-gap) * 0.5);
}

@media (min-width: 481px) {
    .flex-grid > * { flex-basis: calc(50% - var(--grid-gap)); }
}

@media (min-width: 769px) {
    .flex-grid > * { flex-basis: calc(33.333% - var(--grid-gap)); }
}

@media (min-width: 1025px) {
    .flex-grid > * { flex-basis: calc(25% - var(--grid-gap)); }
}

/* ═══════════════════════════════════════════════════════════════════════
   5. PRODUCT CARD COMPONENT (Fully Responsive)
   ═══════════════════════════════════════════════════════════════════════ */

.product-card {
    display: flex;
    flex-direction: column;
    background: var(--surface-dark, #1e293b);
    border-radius: clamp(8px, 1vw, 16px);
    overflow: hidden;
    transition: transform var(--transition-base), 
                box-shadow var(--transition-base);
    cursor: pointer;
    height: 100%;
    min-width: 0; /* Prevent flex overflow */
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

/* Product image container */
.product-card__image {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background: linear-gradient(135deg, #2a2a2a, #1a1a1a);
}

.product-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-card__image img {
    transform: scale(1.05);
}

/* Product content */
.product-card__content {
    padding: var(--space-sm);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.product-card__category {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-primary, #FFD700);
    font-weight: 600;
}

.product-card__title {
    font-size: var(--text-base);
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary, #f1f5f9);
    /* Truncate long titles */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card__price {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--accent-primary, #FFD700);
    margin-top: auto;
}

/* Product actions */
.product-card__actions {
    display: flex;
    gap: var(--space-xs);
    margin-top: var(--space-sm);
}

.product-card__btn {
    flex: 1;
    min-height: var(--touch-target-min);
    padding: var(--space-xs) var(--space-sm);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    touch-action: manipulation;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .product-card__content {
        padding: var(--space-xs);
    }
    
    .product-card__actions {
        flex-direction: column;
    }
    
    .product-card__btn {
        width: 100%;
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   6. NAVIGATION & HEADER (Responsive)
   ═══════════════════════════════════════════════════════════════════════ */

.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-fixed);
    width: 100%;
    min-height: var(--navbar-height);
    padding: var(--space-xs) 0;
    backdrop-filter: blur(10px);
    transition: transform var(--transition-base);
}

/* Hide navbar on scroll down (optional enhancement) */
.navbar--hidden {
    transform: translateY(-100%);
}

.navbar__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.navbar__brand {
    font-size: var(--text-xl);
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
}

.navbar__menu {
    display: none; /* Hidden on mobile by default */
    list-style: none;
    gap: var(--space-sm);
}

.navbar__link {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    min-height: var(--touch-target-min);
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: color var(--transition-base);
}

/* Mobile menu toggle */
.navbar__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 0;
}

/* Desktop navigation */
@media (min-width: 769px) {
    .navbar__menu {
        display: flex;
        flex-direction: row;
    }
    
    .navbar__toggle {
        display: none;
    }
}

/* Mobile menu (slide-in) */
@media (max-width: 768px) {
    .navbar__menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--surface-dark, #1e293b);
        flex-direction: column;
        padding: var(--space-lg);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        overflow-y: auto;
    }
    
    .navbar__menu--open {
        display: flex;
        transform: translateX(0);
    }
    
    .navbar__link {
        width: 100%;
        padding: var(--space-sm);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   7. FILTER SIDEBAR (Responsive)
   ═══════════════════════════════════════════════════════════════════════ */

.shop-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 769px) {
    .shop-layout {
        grid-template-columns: var(--sidebar-width) 1fr;
    }
}

.filter-sidebar {
    position: relative;
}

/* Desktop: Sticky sidebar */
@media (min-width: 769px) {
    .filter-sidebar {
        position: sticky;
        top: calc(var(--navbar-height) + var(--space-md));
        align-self: start;
        max-height: calc(100vh - var(--navbar-height) - var(--space-lg));
        overflow-y: auto;
        /* Custom scrollbar */
        scrollbar-width: thin;
        scrollbar-color: var(--accent-primary) transparent;
    }
    
    .filter-sidebar::-webkit-scrollbar {
        width: 6px;
    }
    
    .filter-sidebar::-webkit-scrollbar-track {
        background: transparent;
    }
    
    .filter-sidebar::-webkit-scrollbar-thumb {
        background: var(--accent-primary);
        border-radius: 3px;
    }
}

/* Mobile: Bottom sheet modal */
@media (max-width: 768px) {
    .filter-sidebar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        max-height: 85vh;
        background: var(--surface-dark, #1e293b);
        border-radius: 20px 20px 0 0;
        padding: var(--space-lg);
        transform: translateY(100%);
        transition: transform var(--transition-base);
        z-index: var(--z-modal);
        overflow-y: auto;
        box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.3);
    }
    
    .filter-sidebar--open {
        transform: translateY(0);
    }
    
    /* Handle for dragging (visual cue) */
    .filter-sidebar::before {
        content: '';
        position: absolute;
        top: 12px;
        left: 50%;
        transform: translateX(-50%);
        width: 40px;
        height: 4px;
        background: rgba(255, 255, 255, 0.3);
        border-radius: 2px;
    }
}

/* Filter backdrop */
.filter-backdrop {
    display: none;
}

@media (max-width: 768px) {
    .filter-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: calc(var(--z-modal) - 1);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-base), 
                    visibility var(--transition-base);
        backdrop-filter: blur(4px);
    }
    
    .filter-backdrop--visible {
        display: block;
        opacity: 1;
        visibility: visible;
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   8. FORM ELEMENTS (Touch-Friendly & Accessible)
   ═══════════════════════════════════════════════════════════════════════ */

/* Input fields */
.form-control,
.form-select,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;
    min-height: var(--touch-target-min);
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-base);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: inherit;
    transition: all var(--transition-base);
    /* Prevent zoom on iOS */
    font-size: max(16px, var(--text-base));
}

.form-control:focus,
.form-select:focus,
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary, #FFD700);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.15);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    min-height: var(--touch-target-min);
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-base);
    touch-action: manipulation;
    user-select: none;
    white-space: nowrap;
}

/* Increase touch targets on touch devices */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .form-control,
    .form-select,
    input,
    select {
        min-height: var(--touch-target-comfortable);
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   9. RESPONSIVE TABLES
   ═══════════════════════════════════════════════════════════════════════ */

.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

/* Mobile: Card view for tables */
@media (max-width: 768px) {
    .table-mobile-cards thead {
        display: none;
    }
    
    .table-mobile-cards tbody tr {
        display: block;
        margin-bottom: var(--space-md);
        padding: var(--space-sm);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.02);
    }
    
    .table-mobile-cards td {
        display: flex;
        justify-content: space-between;
        padding: var(--space-xs) 0;
        border: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .table-mobile-cards td:last-child {
        border-bottom: none;
    }
    
    .table-mobile-cards td::before {
        content: attr(data-label);
        font-weight: 600;
        margin-right: var(--space-sm);
        color: var(--accent-primary, #FFD700);
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   10. FOOTER (Responsive)
   ═══════════════════════════════════════════════════════════════════════ */

.footer {
    padding: var(--space-2xl) 0 var(--space-lg);
    margin-top: var(--space-3xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 481px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 769px) {
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1025px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer__column {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer__title {
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.footer__link {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
    padding: var(--space-2xs) 0;
}

.footer__link:hover {
    color: var(--accent-primary, #FFD700);
}

/* ═══════════════════════════════════════════════════════════════════════
   11. UTILITY CLASSES
   ═══════════════════════════════════════════════════════════════════════ */

/* Visibility utilities */
.hide-mobile { display: none !important; }
.hide-tablet { display: initial !important; }
.hide-desktop { display: initial !important; }

@media (min-width: 481px) {
    .hide-mobile { display: initial !important; }
    .show-mobile { display: none !important; }
}

@media (min-width: 769px) {
    .hide-tablet { display: none !important; }
    .show-tablet { display: initial !important; }
}

@media (min-width: 1025px) {
    .hide-desktop { display: none !important; }
    .show-desktop { display: initial !important; }
}

/* Spacing utilities */
.mt-auto { margin-top: auto !important; }
.mb-auto { margin-bottom: auto !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }

/* Flexbox utilities */
.d-flex { display: flex !important; }
.flex-column { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.align-items-center { align-items: center !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.gap-sm { gap: var(--space-sm) !important; }
.gap-md { gap: var(--space-md) !important; }

/* Text utilities */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

/* Width utilities */
.w-100 { width: 100% !important; }
.w-auto { width: auto !important; }

/* ═══════════════════════════════════════════════════════════════════════
   12. ACCESSIBILITY ENHANCEMENTS
   ═══════════════════════════════════════════════════════════════════════ */

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--accent-primary, #FFD700);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--accent-primary, #FFD700);
    color: #000;
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    z-index: 9999;
    transition: top var(--transition-base);
}

.skip-to-main:focus {
    top: 0;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    * {
        border-width: 2px !important;
    }
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ═══════════════════════════════════════════════════════════════════════
   13. PERFORMANCE OPTIMIZATIONS
   ═══════════════════════════════════════════════════════════════════════ */

/* GPU acceleration for animations */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* Lazy loading images */
img[loading="lazy"] {
    opacity: 1;
    transition: opacity var(--transition-base);
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Prevent layout shift */
img,
video,
iframe {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ═══════════════════════════════════════════════════════════════════════
   14. PRINT STYLES
   ═══════════════════════════════════════════════════════════════════════ */

@media print {
    *,
    *::before,
    *::after {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a,
    a:visited {
        text-decoration: underline;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
    
    img {
        page-break-inside: avoid;
    }
    
    h2,
    h3,
    p {
        orphans: 3;
        widows: 3;
    }
    
    h2,
    h3 {
        page-break-after: avoid;
    }
    
    .navbar,
    .footer,
    .filter-sidebar {
        display: none !important;
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   15. DARK/LIGHT THEME SUPPORT
   ═══════════════════════════════════════════════════════════════════════ */

/* Light theme overrides */
body.light-theme {
    --surface-dark: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: rgba(0, 0, 0, 0.1);
}

body.light-theme .product-card {
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

body.light-theme .product-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body.light-theme .product-card__image {
    background: linear-gradient(135deg, #f5f5f5, #e8e8e8);
}

/* System preference detection */
@media (prefers-color-scheme: dark) {
    :root:not(.light-theme) {
        /* Dark theme is default - no overrides needed */
        color-scheme: dark;
    }
}

@media (prefers-color-scheme: light) {
    :root:not(.dark-theme) {
        /* Apply light theme if no explicit theme set */
        --surface-dark: #ffffff;
        --text-primary: #1e293b;
        --text-secondary: #64748b;
        --border-color: rgba(0, 0, 0, 0.1);
    }
}

/* ═══════════════════════════════════════════════════════════════════════
   END OF UNIVERSAL RESPONSIVE E-COMMERCE DESIGN SYSTEM
   ═══════════════════════════════════════════════════════════════════════ */
/* ═══════════════════════════════════════════════════════════════════════
   13. DASHBOARD & SIDEBAR LAYOUT (Admin Panels)
   ═══════════════════════════════════════════════════════════════════════ */

#sidebar-container {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--surface-dark, #0f172a);
    z-index: var(--z-sticky);
    overflow-y: auto;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-base);
}

#main-content {
    transition: margin-left var(--transition-base), width var(--transition-base);
}

.has-sidebar #main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
}

@media (max-width: 1024px) {
    #sidebar-container {
        transform: translateX(-100%);
    }
    
    #sidebar-container.open {
        transform: translateX(0);
    }
    
    .has-sidebar #main-content {
        margin-left: 0;
        width: 100%;
    }
}

/* Loading Spinner Aesthetics */
.loading-spinner {
    padding: var(--space-xl) 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}
/* Role-specific Visibility */
body.role-superadmin .footer,
body.role-superadmin #footer-container {
    display: none !important;
}

body.role-superadmin .has-sidebar #main-content {
    margin-left: var(--sidebar-width);
}