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

:root {
    --primary-color: #2c5aa0;
    --secondary-color: #4a90e2;
    --accent-color: #1e3a5f;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --border-color: #dee2e6;
    --text-dark: #212529;
    --text-light: #6c757d;
    --white: #ffffff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

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

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

/* Header */
.header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1.5rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.9;
}

.cart-btn {
    position: relative;
    background-color: var(--white);
    color: var(--primary-color);
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.cart-btn:hover {
    background-color: var(--light-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.cart-count {
    background-color: var(--danger-color);
    color: var(--white);
    border-radius: 50%;
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 24px;
    text-align: center;
}

/* Main Content */
.main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 12px;
    margin-bottom: 2rem;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.95;
}

/* Category Navbar */
.category-navbar {
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    overflow: hidden;
}

.nav-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
}

.nav-tab {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    flex: 1;
    min-width: 120px;
    text-align: center;
}

.nav-tab:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.nav-tab.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-bottom-color: var(--accent-color);
}

.nav-tab.active:hover {
    background-color: var(--accent-color);
}

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: end;
    justify-content: center;
}

.search-group {
    flex: 1;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.search-group::before {
    content: "Search:";
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

.filter-group select,
.search-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--white);
    transition: border-color 0.3s ease;
}

.filter-group select:focus,
.search-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Products Grid */
.products {
    margin-bottom: 3rem;
}

.category-section {
    margin-bottom: 3rem;
}

.category-header {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
    text-align: center;
}

.category-products {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

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

.product-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    min-height: 2.5rem;
}

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

.product-description {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    flex-grow: 1;
}

.product-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.add-to-cart-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.add-to-cart-btn:hover {
    background-color: var(--accent-color);
    transform: scale(1.02);
}

.add-to-cart-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-content {
    background-color: var(--white);
    border-radius: 12px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

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

.modal-header h2 {
    margin: 0;
    color: var(--primary-color);
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-light);
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
}

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

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex-grow: 1;
}

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

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

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

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

.cart-item-price {
    color: var(--text-light);
    font-size: 0.9rem;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.qty-btn {
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

.qty-display {
    min-width: 40px;
    text-align: center;
    font-weight: 600;
}

.remove-btn {
    background-color: var(--danger-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.remove-btn:hover {
    background-color: #c82333;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.cart-total.total-line {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 2px solid var(--border-color);
    font-size: 1.3rem;
}

.checkout-btn {
    width: 100%;
    background-color: var(--success-color);
    color: var(--white);
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
    transition: all 0.3s ease;
}

.checkout-btn:hover:not(:disabled) {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.checkout-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

.empty-cart {
    text-align: center;
    color: var(--text-light);
    padding: 2rem;
}

/* Checkout Page */
.checkout-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.checkout-section {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.checkout-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

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

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

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

.order-item-info h4 {
    margin-bottom: 0.25rem;
}

.order-item-details {
    font-size: 0.9rem;
    color: var(--text-light);
}

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

.order-totals {
    border-top: 2px solid var(--border-color);
    padding-top: 1rem;
}

.total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.total-row.grand-total {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    font-size: 1.3rem;
    color: var(--primary-color);
}

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

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

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

#card-container {
    margin-bottom: 1.5rem;
}

#payment-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    display: none;
}

#payment-message.success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

#payment-message.error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Footer */
.footer {
    background-color: var(--accent-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    margin-top: auto;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
    font-size: 1.2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .category-products {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 1rem;
    }
    
    .category-header {
        font-size: 1.5rem;
    }

    .checkout-container {
        grid-template-columns: 1fr;
    }

    .filters {
        flex-direction: column;
    }

    .nav-tabs {
        flex-direction: column;
    }

    .nav-tab {
        min-width: auto;
        text-align: left;
        border-bottom: 1px solid var(--border-color);
        border-right: none;
    }

    .nav-tab:last-child {
        border-bottom: none;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .category-products {
        grid-template-columns: 1fr;
    }

    .modal-content {
        margin: 0;
        max-height: 100vh;
        border-radius: 0;
    }
}