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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --white: #ffffff;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

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

/* Header */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.auth-buttons {
    display: flex;
    gap: 1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
}

.btn-danger {
    background: var(--danger-color);
    color: var(--white);
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-success {
    background: var(--success-color);
    color: var(--white);
}

.btn-success:hover {
    background: #059669;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 5rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.product-card {
    background: var(--white);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    background: var(--bg-color);
}

.product-info {
    padding: 1.5rem;
}

.product-category {
    color: var(--text-light);
    font-size: 0.875rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.product-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.product-description {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.product-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.product-price-old {
    font-size: 1rem;
    color: var(--text-light);
    text-decoration: line-through;
}

.product-discount {
    background: var(--danger-color);
    color: var(--white);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.product-actions {
    display: flex;
    gap: 0.5rem;
}

/* Section Title */
.section-title {
    font-size: 2rem;
    text-align: center;
    margin: 3rem 0 2rem;
    color: var(--text-color);
}

.text-center {
    text-align: center;
    margin: 2rem 0;
}

/* Features Section */
.features {
    background: var(--white);
    padding: 4rem 0;
    margin-top: 4rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
}

.feature-item i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-item h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-item p {
    color: var(--text-light);
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section p {
    margin-bottom: 0.5rem;
    opacity: 0.8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.8;
}

/* Product Detail Page */
.product-detail-page {
    padding: 2rem 0;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

.product-detail-image {
    width: 100%;
    border-radius: 0.75rem;
    background: var(--bg-color);
}

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

.product-detail-category {
    color: var(--text-light);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.product-detail-price-section {
    margin: 1.5rem 0;
}

.product-detail-price {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.product-detail-specs {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin: 1.5rem 0;
}

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

.product-detail-specs ul {
    list-style: none;
}

.product-detail-specs li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.product-detail-description {
    margin: 1.5rem 0;
    color: var(--text-light);
    line-height: 1.8;
}

.product-detail-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.quantity-selector {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1rem 0;
}

.quantity-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    background: var(--white);
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 1.2rem;
}

.quantity-input {
    width: 60px;
    text-align: center;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
}

/* Cart Page */
.cart-page {
    padding: 2rem 0;
}

.page-title {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.cart-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.cart-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.cart-item-image {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 0.5rem;
    background: var(--bg-color);
}

.cart-item-info {
    flex: 1;
}

.cart-item-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.cart-item-price {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.cart-item-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.cart-summary {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    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 {
    border-bottom: none;
    border-top: 2px solid var(--border-color);
    margin-top: 1rem;
    padding-top: 1rem;
    font-size: 1.25rem;
    font-weight: bold;
}

.empty-cart {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-cart i {
    font-size: 4rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.empty-cart h2 {
    margin-bottom: 0.5rem;
}

.empty-cart p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Products Page */
.products-page {
    padding: 2rem 0;
}

.page-header {
    margin-bottom: 2rem;
}

.filter-section {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 250px;
    position: relative;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
}

.filter-select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    background: var(--white);
    cursor: pointer;
}

.no-products {
    text-align: center;
    padding: 4rem 2rem;
}

.no-products i {
    font-size: 4rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

/* Checkout Page */
.checkout-page {
    padding: 2rem 0;
}

.checkout-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.checkout-form-container {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

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

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

.form-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

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

.payment-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s;
}

.payment-option:hover {
    border-color: var(--primary-color);
}

.payment-option input[type="radio"]:checked + i + span {
    color: var(--primary-color);
}

.payment-option input[type="radio"]:checked ~ span {
    color: var(--primary-color);
}

.payment-option i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.checkout-summary {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.checkout-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.checkout-item-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 0.5rem;
    background: var(--bg-color);
}

.checkout-item-info {
    flex: 1;
}

.checkout-item-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.checkout-item-price {
    color: var(--text-light);
    font-size: 0.875rem;
}

.summary-details {
    margin-top: 1rem;
}

/* Orders Page */
.orders-page {
    padding: 2rem 0;
}

.order-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.order-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

.order-status {
    padding: 0.5rem 1rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.order-status.pending {
    background: #fef3c7;
    color: #92400e;
}

.order-status.processing {
    background: #dbeafe;
    color: #1e40af;
}

.order-status.completed {
    background: #d1fae5;
    color: #065f46;
}

.order-status.cancelled {
    background: #fee2e2;
    color: #991b1b;
}

.order-items {
    margin-bottom: 1.5rem;
}

.order-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.order-item-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 0.5rem;
    background: var(--bg-color);
}

.order-item-info {
    flex: 1;
}

.order-item-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.order-item-price {
    color: var(--text-light);
    font-size: 0.875rem;
}

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

.order-total {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Admin Page */
.admin-page {
    padding: 2rem 0;
}

.admin-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 1rem 2rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-light);
    transition: all 0.3s;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.admin-table th {
    background: var(--bg-color);
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-color);
}

.admin-table td {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.admin-table img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 0.5rem;
}

.admin-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    padding: 0.5rem;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 1rem;
}

.btn-edit {
    background: #dbeafe;
    color: #1e40af;
}

.btn-delete {
    background: #fee2e2;
    color: #991b1b;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 0.75rem;
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
}

.modal-large {
    max-width: 700px;
}

.close {
    color: var(--text-light);
    float: right;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow);
    }

    .nav.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }

    .product-detail {
        grid-template-columns: 1fr;
    }

    .cart-content,
    .checkout-content {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .admin-table {
        font-size: 0.875rem;
    }

    .admin-table th,
    .admin-table td {
        padding: 0.5rem;
    }
}