/* =============================================
   PROFESSIONAL DARK THEME | 3D EFFECTS | FULLY RESPONSIVE
   VERSION 6.0 - FIXED WHITE BACKGROUND READABILITY
   ============================================= */

/* ---------- RESET & GLOBAL ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Dark theme color palette - Premium Neon */
    --bg-primary: #0a0c12;
    --bg-secondary: #11131c;
    --bg-tertiary: #161a23;
    --bg-card: rgba(22, 26, 35, 0.92);
    --bg-card-solid: #1a1e2a;
    --bg-hover: rgba(30, 35, 48, 0.98);
    
    /* Light theme elements (for white backgrounds) */
    --light-bg: #ffffff;
    --light-text: #1a1a2e;
    --light-text-secondary: #4a5568;
    --light-border: #e2e8f0;
    --light-shadow: rgba(0, 0, 0, 0.1);
    
    /* Glassmorphism Layers */
    --glass-bg: rgba(22, 26, 35, 0.65);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-highlight: rgba(255, 255, 255, 0.03);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* Neon Accents */
    --primary: #ff6b6b;
    --primary-dark: #e05a5a;
    --primary-glow: rgba(255, 107, 107, 0.6);
    --secondary: #4ecdc4;
    --secondary-glow: rgba(78, 205, 196, 0.6);
    --accent: #c850c0;
    --accent-glow: rgba(200, 80, 192, 0.6);
    --gold: #ffd700;
    --gold-glow: rgba(255, 215, 0, 0.4);
    
    /* Status */
    --success: #00d26a;
    --success-glow: rgba(0, 210, 106, 0.4);
    --warning: #ffb347;
    --danger: #ff4757;
    --info: #4a6eff;
    
    /* Text - Dark theme */
    --text-primary: #ffffff;
    --text-secondary: #c1c4d1;
    --text-muted: #7a7e8f;
    
    /* Text - Light theme (for white backgrounds) */
    --text-light-primary: #1a1a2e;
    --text-light-secondary: #4a5568;
    --text-light-muted: #718096;
    
    /* Borders & Shadows 3D */
    --border-light: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
    --shadow-2xl: 0 30px 50px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 25px var(--primary-glow);
    --shadow-neon: 0 0 15px rgba(78, 205, 196, 0.5);
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    
    /* 3D Transform */
    --lift-distance: -8px;
    --perspective: 1000px;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.34, 1.2, 0.64, 1);
    --transition-slow: 0.5s cubic-bezier(0.34, 1.2, 0.64, 1);
    --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

body {
    font-family: 'Poppins', 'Inter', 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(78, 205, 196, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(255, 107, 107, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(200, 80, 192, 0.02) 0%, transparent 60%);
    min-height: 100vh;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

/* Custom premium scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    transition: var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    box-shadow: var(--shadow-glow);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== HEADER - PREMIUM GLASS 3D ========== */
header {
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    gap: 24px;
}

.logo h1 {
    font-size: 1.9rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 35%, var(--accent) 70%, var(--gold) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
    letter-spacing: -0.5px;
    transition: var(--transition-normal);
    text-shadow: 0 0 20px rgba(255,107,107,0.2);
    animation: gradientShift 8s ease infinite;
    background-size: 200% auto;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}

.logo h1:hover {
    transform: scale(1.03);
    text-shadow: 0 0 30px rgba(78,205,196,0.4);
}

.logo a {
    text-decoration: none;
    color: inherit;
}

/* Back link for checkout */
.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    padding: 10px 20px;
    background: var(--glass-bg);
    border-radius: 40px;
    border: 1px solid var(--glass-border);
    transition: var(--transition-normal);
}

.back-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateX(-4px);
    box-shadow: var(--shadow-glow);
}

/* 3D Search Bar */
.header-search {
    flex: 1;
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    position: relative;
}

.header-search input {
    flex: 1;
    padding: 12px 18px;
    background: rgba(10, 12, 18, 0.85);
    border: 1px solid var(--border-light);
    border-right: none;
    border-radius: 16px 0 0 16px;
    font-size: 15px;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    backdrop-filter: blur(4px);
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px var(--primary-glow);
    background: rgba(10, 12, 18, 0.98);
}

.header-search button {
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 0 16px 16px 0;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

.header-search button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.header-search button:hover::before {
    left: 100%;
}

.header-search button:hover {
    transform: translateX(3px) translateY(-2px);
    box-shadow: 0 5px 20px var(--primary-glow);
}

/* Cart Icon 3D */
.header-cart .cart-icon {
    position: relative;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.7rem;
    transition: var(--transition-bounce);
    display: inline-block;
    background: var(--glass-bg);
    padding: 8px 14px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(4px);
}

.header-cart .cart-icon:hover {
    transform: translateY(-4px) scale(1.08);
    text-shadow: 0 0 15px var(--primary-glow);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.cart-count {
    position: absolute;
    top: -5px;
    right: -5px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 3px 8px;
    border-radius: 30px;
    min-width: 22px;
    text-align: center;
    box-shadow: 0 0 10px rgba(255,107,107,0.6);
    animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
    0%, 100% { transform: scale(1); box-shadow: 0 0 5px var(--primary-glow); }
    50% { transform: scale(1.1); box-shadow: 0 0 20px var(--primary-glow); }
}

.mobile-menu-btn {
    display: none;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 12px;
    transition: var(--transition-fast);
}

.mobile-menu-btn:hover {
    border-color: var(--primary);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* ========== PAGE TITLE ========== */
.page-title {
    margin: 30px 0 20px;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ========== CHECKOUT PAGE STYLES - FIXED FOR WHITE BACKGROUND ========== */
.checkout-container {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 32px;
    margin: 30px 0 50px;
}

.checkout-form {
    background: var(--light-bg);
    border-radius: 28px;
    padding: 32px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-normal);
    border: 1px solid var(--light-border);
}

.checkout-form:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.checkout-form h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-light-primary);
    border-left: 4px solid var(--primary);
    padding-left: 15px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-light-primary);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: #f8f9fa;
    border: 1px solid var(--light-border);
    border-radius: 16px;
    font-size: 1rem;
    color: var(--text-light-primary);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
    background: var(--light-bg);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light-muted);
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-light-secondary);
    font-size: 0.75rem;
}

/* Order Summary Sidebar - Dark theme */
.order-summary {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border-radius: 28px;
    border: 1px solid var(--glass-border);
    padding: 28px;
    position: sticky;
    top: 100px;
    height: fit-content;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
}

.order-summary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.order-summary h2 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.order-items {
    margin: 20px 0;
    max-height: 400px;
    overflow-y: auto;
}

.order-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-fast);
}

.order-item:hover {
    background: rgba(255,107,107,0.05);
    padding-left: 8px;
    border-radius: 12px;
}

.item-info {
    flex: 1;
    display: flex;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
}

.item-name {
    font-weight: 600;
    color: var(--text-primary);
}

.item-qty {
    color: var(--secondary);
    font-size: 0.85rem;
    background: rgba(78,205,196,0.15);
    padding: 2px 8px;
    border-radius: 20px;
}

.item-price {
    font-weight: 700;
    color: var(--primary);
}

.order-totals {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
}

.total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 5px 0;
    color: var(--text-secondary);
}

.total-row.grand-total {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-top: 10px;
    padding-top: 12px;
    border-top: 1px solid var(--border-medium);
}

.total-row.grand-total span:last-child {
    color: var(--primary);
    font-size: 1.3rem;
}

/* Place Order Button */
.place-order-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--success), #00994d);
    color: white;
    border: none;
    border-radius: 20px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-normal);
    margin-top: 16px;
    position: relative;
    overflow: hidden;
    letter-spacing: 1px;
}

.place-order-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.place-order-btn:hover::before {
    left: 100%;
}

.place-order-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--success-glow);
}

.place-order-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* ========== MAIN LAYOUT ========== */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    margin: 40px 0;
}

/* ========== SIDEBAR - GLASS CARD 3D ========== */
.sidebar {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 24px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--glass-border);
    height: fit-content;
    position: sticky;
    top: 100px;
    transition: var(--transition-normal);
    transform-style: preserve-3d;
}

.sidebar:hover {
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255,107,107,0.2);
    transform: translateY(-3px);
}

.filter-section {
    margin-bottom: 28px;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 20px;
}

.filter-section:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.filter-section h3 {
    margin-bottom: 16px;
    font-size: 1.1rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 220px;
    overflow-y: auto;
}

.filter-options label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    padding: 8px 12px;
    border-radius: 12px;
    transition: var(--transition-fast);
    color: var(--text-secondary);
}

.filter-options label:hover {
    background: linear-gradient(90deg, rgba(255,107,107,0.1), transparent);
    color: var(--text-primary);
    transform: translateX(6px);
}

.filter-options input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
    border-radius: 4px;
}

.price-range {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.price-range input {
    flex: 1;
    padding: 10px 12px;
    background: rgba(10, 12, 18, 0.7);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.price-range input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 8px var(--primary-glow);
}

.apply-filter, .clear-filters {
    width: 100%;
    padding: 12px;
    margin-top: 12px;
    border-radius: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    font-size: 0.9rem;
}

.apply-filter {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.apply-filter:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.5);
}

.clear-filters {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
}

.clear-filters:hover {
    background: rgba(255, 107, 107, 0.1);
    border-color: var(--primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* ========== PRODUCTS SECTION ========== */
.products-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    flex-wrap: wrap;
    gap: 15px;
}

.products-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.view-options {
    display: flex;
    gap: 12px;
}

.view-btn {
    padding: 10px 18px;
    background: var(--glass-bg);
    border: 1px solid var(--border-light);
    border-radius: 14px;
    cursor: pointer;
    transition: var(--transition-normal);
    color: var(--text-secondary);
    backdrop-filter: blur(8px);
}

.view-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 0 15px var(--primary-glow);
}

.view-btn:hover:not(.active) {
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
    margin-bottom: 40px;
}

.products-grid.list-view {
    grid-template-columns: 1fr;
}

.products-grid.list-view .product-card {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 20px;
    align-items: center;
}

.products-grid.list-view .product-image {
    height: 200px;
}

/* ========== PRODUCT CARD - ULTRA 3D ========== */
.product-card {
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-light);
    position: relative;
    transform-style: preserve-3d;
    transform: translateZ(0);
    animation: cardAppear 0.5s cubic-bezier(0.2, 0.9, 0.4, 1.1) backwards;
    animation-delay: calc(var(--index, 0) * 0.05s);
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 24px;
    padding: 1px;
    background: linear-gradient(135deg, transparent 0%, var(--primary) 50%, transparent 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s;
}

.product-card:hover::before {
    opacity: 0.6;
}

.product-card:hover {
    transform: translateY(var(--lift-distance)) scale(1.02);
    box-shadow: var(--shadow-2xl), 0 0 30px rgba(255,107,107,0.25);
    border-color: rgba(255,107,107,0.3);
}

.product-image {
    position: relative;
    height: 260px;
    overflow: hidden;
    background: linear-gradient(135deg, #1a1e2a, #0f1119);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.product-card:hover .product-image img {
    transform: scale(1.12) rotate(1deg);
}

.no-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.product-brand {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border: 1px solid rgba(255,255,255,0.1);
    z-index: 2;
}

.product-info {
    padding: 18px;
}

.product-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.product-category {
    color: var(--secondary);
    font-size: 0.8rem;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.4;
    max-height: 2.8em;
    overflow: hidden;
}

.product-price {
    margin-bottom: 16px;
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 8px;
}

.price {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), #ff9a9e);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 8px rgba(255,107,107,0.3);
}

.original-price {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

.discount-badge {
    background: linear-gradient(135deg, var(--success), #00994d);
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: bold;
    color: white;
}

.add-to-cart-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 700;
    letter-spacing: 0.8px;
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
}

.add-to-cart-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.add-to-cart-btn:hover::before {
    left: 100%;
}

.add-to-cart-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px var(--primary-glow);
}

.add-to-cart-btn:disabled {
    background: #3a3f4e;
    cursor: not-allowed;
    transform: none;
}

/* ========== CART SIDEBAR ========== */
.cart-sidebar {
    position: fixed;
    top: 0;
    right: -100%;
    width: 450px;
    max-width: 90vw;
    height: 100vh;
    background: rgba(17, 19, 28, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: -10px 0 40px rgba(0,0,0,0.6);
    transition: right 0.4s cubic-bezier(0.32, 0.72, 0, 1);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--glass-border);
}

.cart-sidebar.active {
    right: 0;
}

.cart-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-header h3 {
    font-size: 1.4rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.close-cart {
    background: rgba(255,255,255,0.05);
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    width: 36px;
    height: 36px;
    border-radius: 12px;
}

.close-cart:hover {
    background: var(--danger);
    color: white;
    transform: rotate(90deg);
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.cart-item {
    display: flex;
    gap: 15px;
    padding: 16px;
    margin-bottom: 12px;
    background: rgba(255,255,255,0.03);
    border-radius: 18px;
    border: 1px solid var(--border-light);
    transition: var(--transition-fast);
    position: relative;
    flex-wrap: wrap;
}

.cart-item:hover {
    background: rgba(255,107,107,0.08);
    transform: translateX(-5px);
    border-color: var(--primary);
}

.cart-item-image {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    border-radius: 14px;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.cart-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cart-item-details {
    flex: 2;
    min-width: 140px;
}

.cart-item-details h3 {
    font-size: 0.95rem;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.item-price {
    font-weight: 700;
    color: var(--primary);
    font-size: 0.9rem;
}

.cart-item-quantity {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0,0,0,0.3);
    padding: 4px 10px;
    border-radius: 40px;
    width: fit-content;
}

.qty-btn {
    width: 28px;
    height: 28px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 30px;
    cursor: pointer;
    font-weight: bold;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.qty-btn:hover {
    background: var(--primary);
    transform: scale(1.1);
}

.qty-input {
    width: 45px;
    text-align: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-weight: 600;
}

.cart-item-total {
    font-weight: 800;
    color: var(--secondary);
    font-size: 1rem;
    min-width: 70px;
    text-align: right;
}

.remove-item {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition-fast);
    width: 32px;
    height: 32px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-item:hover {
    background: rgba(255,71,87,0.2);
    transform: scale(1.15);
}

.cart-footer {
    padding: 20px;
    border-top: 1px solid var(--border-light);
    background: rgba(0,0,0,0.3);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.checkout-btn {
    display: block;
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--success), #00994d);
    color: white;
    text-align: center;
    text-decoration: none;
    border-radius: 14px;
    transition: var(--transition-normal);
    font-weight: 600;
}

.checkout-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,210,106,0.4);
}

/* ========== CART PAGE ========== */
.cart-container {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 30px;
    margin-bottom: 40px;
}

.cart-items-list {
    background: var(--bg-card);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.cart-item-row {
    display: grid;
    grid-template-columns: 100px 1fr 140px 120px 50px;
    gap: 16px;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-fast);
}

.cart-item-row:hover {
    background: rgba(255,107,107,0.05);
}

.cart-summary {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-radius: 24px;
    padding: 24px;
    border: 1px solid var(--border-light);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.empty-cart {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-card);
    border-radius: 24px;
    border: 1px solid var(--border-light);
}

.empty-cart i {
    font-size: 4rem;
    color: var(--text-muted);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.continue-shopping {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    text-decoration: none;
    border-radius: 40px;
    transition: var(--transition-normal);
    font-weight: 600;
}

.continue-shopping:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

/* ========== LOADING & LOAD MORE ========== */
.loading {
    text-align: center;
    padding: 50px;
    color: var(--text-secondary);
    font-size: 1rem;
    grid-column: 1 / -1;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 24px;
    height: 24px;
    margin-left: 12px;
    border: 2px solid var(--primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin3D 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
}

@keyframes spin3D {
    from { transform: rotate(0deg) scale(1); }
    to { transform: rotate(360deg) scale(1.2); }
}

.load-more {
    text-align: center;
    margin: 20px 0 50px;
}

.load-more-btn {
    padding: 14px 36px;
    background: linear-gradient(135deg, var(--secondary), #2c9c94);
    color: white;
    border: none;
    border-radius: 40px;
    cursor: pointer;
    transition: var(--transition-normal);
    font-size: 1rem;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.3);
}

.load-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(78, 205, 196, 0.5);
}

/* ========== TOAST NOTIFICATION ========== */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: rgba(0,0,0,0.95);
    backdrop-filter: blur(20px);
    padding: 16px 28px;
    border-radius: 20px;
    transform: translateY(100px) scale(0.9);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.34, 1.2, 0.64, 1);
    z-index: 1002;
    border-left: 4px solid var(--success);
    font-weight: 500;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 12px;
}

.toast.show {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.toast.error {
    border-left-color: var(--danger);
}

.toast i {
    font-size: 1.2rem;
}

/* ========== RESPONSIVE BREAKPOINTS ========== */
@media (max-width: 1024px) {
    .cart-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .cart-summary {
        position: static;
    }
    
    .checkout-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .order-summary {
        position: static;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .header-search {
        order: 3;
        max-width: 100%;
        margin-top: 10px;
    }
    
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: fixed;
        left: -320px;
        top: 0;
        width: 300px;
        height: 100vh;
        z-index: 1002;
        border-radius: 0 24px 24px 0;
        transition: left var(--transition-normal);
        overflow-y: auto;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .cart-sidebar {
        width: 100%;
        right: -100%;
    }
    
    .products-grid.list-view .product-card {
        grid-template-columns: 1fr;
    }
    
    .products-grid.list-view .product-image {
        height: 220px;
    }
    
    .cart-item-row {
        grid-template-columns: 80px 1fr;
        grid-template-rows: auto auto auto;
        gap: 12px;
        position: relative;
    }
    
    .cart-item-row .cart-item-image {
        grid-row: span 3;
    }
    
    .cart-item-row .cart-item-details {
        grid-column: 2;
    }
    
    .cart-item-row .cart-item-quantity {
        grid-column: 2;
    }
    
    .cart-item-row .cart-item-total {
        grid-column: 2;
    }
    
    .cart-item-row .remove-item {
        position: absolute;
        top: 15px;
        right: 15px;
    }
    
    .cart-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .cart-item-image {
        width: 100%;
        height: 150px;
    }
    
    .cart-item-details {
        width: 100%;
    }
    
    .cart-item-quantity {
        margin: 8px 0;
    }
    
    .cart-item-total {
        text-align: left;
        width: 100%;
    }
    
    .remove-item {
        position: absolute;
        top: 8px;
        right: 8px;
    }
    
    .checkout-form {
        padding: 24px;
    }
    
    .checkout-form h2 {
        font-size: 1.4rem;
    }
    
    .order-summary {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .price-range {
        flex-direction: column;
    }
    
    .price-range input {
        width: 100%;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .products-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ========== UTILITIES & MISC ========== */
.product-brand img {
    max-width: 40px;
    max-height: 40px;
    border-radius: 10px;
}

button, .product-card, .view-btn, .apply-filter, .clear-filters, .load-more-btn, .place-order-btn {
    cursor: pointer;
    backface-visibility: hidden;
}

.filter-options::-webkit-scrollbar {
    width: 4px;
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}