/* Enhanced Modern CSS with Responsive Design */
:root {
    /* Modern Color Palette */
    --primary: #8484b6;
    --primary-dark: #8a87bf;
    --primary-light: #cfc1ed;
    --secondary: #f8fafc;
    --accent: #f59e0b;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Neutral Colors */
    --text-primary: #6d81a1;
    --text-secondary: #a6b1c2;
    --text-tertiary: #94a3b8;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    
    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Typography */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #222;
    background: #f8fafc;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space);
}

/* Enhanced Header with Glassmorphism */
header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space) 0;
    gap: var(--space-lg);
}

.logo a {
    font-size: var(--text-2xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex: 1;
    justify-content: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--primary);
    border-radius: 50%;
}

.nav-icons {
    display: flex;
    align-items: center;
    gap: var(--space);
}

.search-icon,
.cart-icon {
    padding: var(--space-xs);
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.search-icon:hover,
.cart-icon:hover {
    background: var(--gray-100);
    transform: translateY(-1px);
}

.cart-count {
    position: absolute;
    top: -4px;
    right: -4px;
    background: linear-gradient(135deg, var(--error), #f97316);
    color: var(--white);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: 600;
    box-shadow: var(--shadow);
}

/* Enhanced Hero Section */
.hero {
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.1) 0%, 
        rgba(139, 92, 246, 0.05) 50%, 
        rgba(236, 72, 153, 0.05) 100%);
    padding: var(--space-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space);
    background: linear-gradient(135deg, var(--text-primary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

/* Enhanced Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.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: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--space) var(--space-xl);
    font-size: var(--text-lg);
}

.btn-full {
    width: 100%;
}

/* Enhanced Product Cards */
.products-section {
    padding: var(--space-2xl) 0;
}

.section-title {
    font-size: var(--text-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 2px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    border: 1px solid var(--gray-200);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    transform: scaleX(0);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.product-card:hover::before {
    transform: scaleX(1);
}

.product-image-container {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.product-badge {
    position: absolute;
    top: var(--space);
    left: var(--space);
    background: var(--success);
    color: var(--white);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.product-info {
    padding: var(--space-lg);
}

.product-title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
    line-height: 1.4;
}

.product-description {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--space);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space);
}

.product-price {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--primary);
}

.product-rating {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--warning);
    font-size: var(--text-sm);
}

.add-to-cart {
    width: 100%;
    justify-content: center;
}

/* Enhanced Product Details */
.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    margin: var(--space-xl) 0;
    align-items: start;
}

.product-gallery {
    display: flex;
    flex-direction: column;
    gap: var(--space);
}

.main-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--white);
}

.main-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
}

.image-thumbnails {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space);
}

.thumbnail {
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    background: var(--white);
    box-shadow: var(--shadow-sm);
}

.thumbnail.active,
.thumbnail:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.thumbnail img {
    width: 100%;
    height: 80px;
    object-fit: cover;
}

/* Enhanced Cart & Checkout */
.cart-layout,
.checkout-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-2xl);
    margin: var(--space-xl) 0;
    align-items: start;
}

.cart-items-section,
.checkout-form-section {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
}

.cart-header {
    display: flex;
    align-items: center;
    justify-content: between;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space);
    border-bottom: 2px solid var(--gray-100);
}

.cart-item {
    display: grid;
    grid-template-columns: 100px 1fr auto;
    gap: var(--space);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--gray-100);
    align-items: center;
}

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

.cart-item-image {
    width: 100px;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.cart-item-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.cart-item-title {
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.cart-item-price {
    font-weight: 700;
    color: #fff;
    font-size: var(--text-lg);
}

.cart-item-subtotal {
    font-weight: bold;
    color: #fff;
    font-size: 1.1rem;
}

.cart-total span:last-child {
    font-weight: bold;
    color: #fff;
    font-size: 1.2rem;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: var(--space);
}

.quantity-selector {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 4px;
}

.quantity-btn {
    background: var(--white);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

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

.quantity-input {
    width: 50px;
    text-align: center;
    border: none;
    background: transparent;
    font-weight: 600;
    color: var(--text-primary);
}

.remove-item {
    background: none;
    border: none;
    color: var(--error);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius);
    transition: var(--transition);
}

.remove-item:hover {
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

/* Enhanced Empty States */
.empty-cart {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-secondary);
}

.empty-cart-icon {
    font-size: 4rem;
    margin-bottom: var(--space);
    opacity: 0.5;
}

/* Enhanced Forms */
.form-section {
    margin-bottom: var(--space-xl);
}

.form-section h2 {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space);
    color: var(--text-primary);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--space-sm);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: var(--text-base);
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.form-group.full-width {
    grid-column: 1 / -1;
}

/* Enhanced Footer */
footer {
    background: linear-gradient(135deg, var(--text-primary), #1e293b);
    color: var(--white);
    margin-top: var(--space-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-2xl);
    padding: var(--space-2xl) 0;
}

.footer-section h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space);
    color: var(--white);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--space-xs);
}

.footer-section a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--space) 0;
    text-align: center;
    color: var(--gray-400);
}

/* Enhanced Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .product-detail {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .cart-layout,
    .checkout-layout {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: var(--space);
        padding: var(--space) 0;
    }
    
    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
        gap: var(--space);
    }
    
    .nav-icons {
        gap: var(--space);
    }
    
    .hero {
        padding: var(--space-xl) 0;
    }
    
    .hero h1 {
        font-size: var(--text-3xl);
    }
    
    .hero p {
        font-size: var(--text-lg);
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--space);
    }
    
    .cart-item {
        grid-template-columns: 80px 1fr;
        gap: var(--space);
    }
    
    .cart-item-controls {
        grid-column: 1 / -1;
        justify-content: space-between;
        margin-top: var(--space);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .image-thumbnails {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space: 0.75rem;
        --space-lg: 1.25rem;
        --space-xl: 1.75rem;
    }
    
    .container {
        padding: 0 var(--space);
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-card {
        margin: 0 var(--space);
    }
    
    .cart-items-section,
    .checkout-form-section {
        padding: var(--space);
        margin: 0 var(--space);
    }
    
    .btn-large {
        padding: var(--space-sm) var(--space);
        font-size: var(--text-base);
    }
    
    .image-thumbnails {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-sm { margin-bottom: var(--space-xs); }
.mb { margin-bottom: var(--space); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-sm { margin-top: var(--space-xs); }
.mt { margin-top: var(--space); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.p-sm { padding: var(--space-xs); }
.p { padding: var(--space); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

/* Loading States */
.loading {
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: var(--space);
    right: var(--space);
    background: var(--white);
    color: var(--text-primary);
    padding: var(--space);
    border-radius: var(--radius);
    box-shadow: var(--shadow-xl);
    border-left: 4px solid var(--success);
    transform: translateX(100%);
    transition: var(--transition);
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateX(0);
}

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

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

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Focus States for Accessibility */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-tertiary: #94a3b8;
        --white: #5f73a4;
        --gray-50: #324665;
        --gray-100: #8ca1bf;
        --gray-200: #475569;
        --gray-300: #64748b;
        --gray-400: #94a3b8;
    }
    
    body {
        background: linear-gradient(135deg, #8b99ba 0%, #1e293b 100%);
    }
    
    .product-card,
    .cart-items-section,
    .checkout-form-section {
        background: var(--gray-50);
        border-color: var(--gray-200);
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        background: var(--gray-100);
        border-color: var(--gray-200);
        color: var(--text-primary);
    }
}