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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background-color: var(--text-primary);
    color: white;
    padding: 0.5rem 0;
}

.header-top-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.header-link {
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.header-link:hover {
    opacity: 0.8;
}

.main-nav {
    padding: 1rem 0;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-form {
    display: flex;
    gap: 0.5rem;
}

.search-input {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    width: 250px;
}

.search-btn {
    padding: 0.5rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

.search-btn:hover {
    background-color: var(--primary-dark);
}

.cart-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.2rem;
    position: relative;
}

.cart-count {
    background-color: var(--danger-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Page Header */
.page-header {
    margin: 2rem 0;
}

.page-header h2 {
    font-size: 2rem;
    color: var(--text-primary);
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.product-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.product-image {
    width: 100%;
    height: 200px;
    background-color: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.product-info {
    padding: 1.5rem;
}

.product-name {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.product-name a {
    color: var(--text-primary);
    text-decoration: none;
}

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

.product-category {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.product-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.product-stock {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.add-to-cart-form {
    margin-top: 1rem;
}

.btn-add-cart {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-add-cart:hover {
    background-color: var(--primary-dark);
}

/* Product Detail */
.breadcrumb {
    margin: 1rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin: 2rem 0;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.product-detail-image {
    width: 100%;
}

.product-detail-image img {
    width: 100%;
    border-radius: 8px;
}

.product-detail-info h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.product-price-large {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.product-stock-info {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.product-description {
    margin: 2rem 0;
}

.product-description h3 {
    margin-bottom: 1rem;
}

.quantity-selector {
    margin: 1rem 0;
}

.quantity-selector label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.quantity-selector input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 100px;
}

.btn-primary {
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-secondary {
    padding: 0.75rem 1.5rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.2s;
}

.btn-secondary:hover {
    background-color: #475569;
}

/* Reviews */
.reviews-section {
    margin: 3rem 0;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.review-form {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.rating-selector,
.review-text-area {
    margin-bottom: 1rem;
}

.rating-selector label,
.review-text-area label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.rating-selector select,
.review-text-area textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
}

.reviews-list {
    margin-top: 2rem;
}

.review-item {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

.review-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.review-author {
    font-weight: 600;
}

.review-rating {
    color: var(--warning-color);
}

.review-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.review-content {
    margin-top: 0.5rem;
    line-height: 1.8;
}

/* Cart */
.cart-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.cart-items {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.cart-item {
    display: grid;
    grid-template-columns: 100px 1fr auto;
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.cart-item-image {
    width: 100px;
    height: 100px;
    border-radius: 8px;
    overflow: hidden;
}

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

.cart-item-info h3 {
    margin-bottom: 0.5rem;
}

.cart-item-info h3 a {
    color: var(--text-primary);
    text-decoration: none;
}

.cart-item-info h3 a:hover {
    color: var(--primary-color);
}

.cart-item-price,
.cart-item-quantity,
.cart-item-total {
    margin: 0.25rem 0;
    color: var(--text-secondary);
}

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

.btn-remove {
    color: var(--danger-color);
    text-decoration: none;
    font-size: 0.9rem;
}

.btn-remove:hover {
    text-decoration: underline;
}

.cart-summary {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.cart-summary h3 {
    margin-bottom: 1.5rem;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.summary-row.total {
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: none;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 2px solid var(--border-color);
}

.btn-checkout {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: block;
    text-align: center;
    margin-top: 1.5rem;
    transition: background-color 0.2s;
}

.btn-checkout:hover {
    background-color: var(--primary-dark);
}

.empty-cart,
.no-products,
.no-orders {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

/* Checkout */
.checkout-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.form-section:last-child {
    border-bottom: none;
}

.form-section h3 {
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
}

.payment-methods {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.payment-methods label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

/* Orders */
.orders-list {
    margin: 2rem 0;
}

.order-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
}

.order-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.order-id {
    font-weight: 700;
    font-size: 1.1rem;
}

.order-date {
    color: var(--text-secondary);
}

.order-details p {
    margin: 0.5rem 0;
}

.order-actions {
    margin-top: 1rem;
}

.order-card-small {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.order-amount {
    font-weight: 600;
    color: var(--primary-color);
}

.order-status {
    padding: 0.25rem 0.75rem;
    background-color: var(--success-color);
    color: white;
    border-radius: 4px;
    font-size: 0.9rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.btn-small:hover {
    background-color: var(--primary-dark);
}

/* Track */
.track-container {
    max-width: 600px;
    margin: 2rem auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.track-form {
    margin-bottom: 2rem;
}

.track-result,
.error-message {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
}

.track-result {
    background-color: #dbeafe;
    border-left: 4px solid var(--primary-color);
}

.error-message {
    background-color: #fee2e2;
    border-left: 4px solid var(--danger-color);
}

.error-message pre,
.track-result pre {
    margin-top: 1rem;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Auth */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    margin: 2rem 0;
}

.auth-box {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.auth-box h2 {
    margin-bottom: 2rem;
    text-align: center;
}

.auth-link {
    margin-top: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-link a {
    color: var(--primary-color);
    text-decoration: none;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Profile */
.profile-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.profile-info,
.profile-orders {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.profile-info h3,
.profile-orders h3 {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.info-row {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

/* Admin Import */
.import-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.import-form textarea {
    font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 0.9rem;
}

.success-message {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: #d1fae5;
    border-left: 4px solid var(--success-color);
    border-radius: 8px;
}

.success-message ul {
    margin-top: 1rem;
    margin-left: 2rem;
}

/* Footer */
footer {
    background-color: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive */
@media (max-width: 768px) {
    .product-detail {
        grid-template-columns: 1fr;
    }
    
    .cart-container {
        grid-template-columns: 1fr;
    }
    
    .cart-summary {
        position: static;
    }
    
    .profile-container {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
    
    .search-input {
        width: 150px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}