/* style.css */
:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #64748b;
    --accent: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 0.75rem;
}

* {
    box-sizing: border_box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4.5rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.025em;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    margin-left: 2rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

.cart-badge {
    background: var(--accent);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    vertical-align: top;
    margin-left: 0.25rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    color: white;
    padding: 4rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--surface);
    color: var(--primary);
}

.btn-secondary:hover {
    background: #f1f5f9;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.product-card {
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    width: 100%;
    height: 240px;
    object-fit: cover;
    background: #f1f5f9;
}

.product-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    text-decoration: none;
}

.product-title:hover {
    color: var(--primary);
}

.product-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-top: auto;
    margin-bottom: 1rem;
}

/* Product Detail */
.product-detail-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding: 4rem 0;
}

.detail-image {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.detail-info h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.detail-description {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

/* Cart */
.cart-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.cart-table th, .cart-table td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.cart-table th {
    background: #f8fafc;
    font-weight: 600;
}

.cart-summary {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    max-width: 400px;
    margin-left: auto;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.total-row {
    font-weight: 800;
    font-size: 1.5rem;
    border-top: 2px solid var(--border);
    padding-top: 1rem;
    margin-top: 1rem;
}

/* Utilities */
.text-center { text-align: center; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }

/* Mobile Responsive */
@media (max-width: 768px) {
    .product-detail-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero h1 { font-size: 2rem; }
}