:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1f2937;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo i {
    font-size: 1.8rem;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    opacity: 0.9;
}

.nav-link:hover,
.nav-link.active {
    opacity: 1;
    text-shadow: 0 0 10px rgba(255,255,255,0.5);
}

.cart-btn {
    position: relative;
    background: rgba(255,255,255,0.2);
    border: none;
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.cart-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.05);
}

.cart-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger);
    color: var(--white);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* Products Section */
.products-section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray);
}

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

.product-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

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

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

.product-body {
    padding: 1.5rem;
}

.product-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.product-description {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 1rem;
    line-height: 1.5;
}

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

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

.product-stock {
    font-size: 0.875rem;
    color: var(--success);
    font-weight: 500;
}

.add-to-cart-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border: none;
    padding: 0.875rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.add-to-cart-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.add-to-cart-btn:active {
    transform: scale(0.98);
}

/* Loading Spinner */
.loading-spinner {
    text-align: center;
    padding: 3rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error Message */
.error-message {
    text-align: center;
    padding: 2rem;
    background: #fee;
    border: 1px solid var(--danger);
    border-radius: 8px;
    color: var(--danger);
}

/* Cart Sidebar */
.cart-sidebar {
    position: fixed;
    right: -450px;
    top: 0;
    width: 450px;
    height: 100vh;
    background: var(--white);
    box-shadow: -2px 0 10px rgba(0,0,0,0.1);
    transition: var(--transition);
    z-index: 2000;
    display: flex;
    flex-direction: column;
}

.cart-sidebar.active {
    right: 0;
}

.cart-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-header h3 {
    font-size: 1.5rem;
}

.close-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: var(--white);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: rgba(255,255,255,0.3);
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.empty-cart {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray);
}

.empty-cart i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

.cart-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--light-gray);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.cart-item-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 6px;
}

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

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

.cart-item-price {
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.qty-btn {
    background: var(--primary);
    color: var(--white);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.remove-btn {
    background: var(--danger);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
    margin-left: auto;
}

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

.cart-footer {
    padding: 1.5rem;
    border-top: 2px solid var(--light-gray);
    background: #fafafa;
}

.cart-summary {
    margin-bottom: 1rem;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.summary-row.total {
    font-size: 1.25rem;
    font-weight: 700;
    padding-top: 0.5rem;
    border-top: 2px solid var(--light-gray);
    margin-top: 0.5rem;
}

.checkout-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.checkout-btn:hover:not(:disabled) {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.checkout-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.modal-content {
    position: relative;
    background: var(--white);
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 12px 12px 0 0;
}

/* Checkout Form */
.checkout-form {
    padding: 2rem;
}

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

.form-section h4 {
    margin-bottom: 1rem;
    color: var(--dark);
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

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

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

.order-summary {
    background: var(--light-gray);
    padding: 1rem;
    border-radius: 8px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
}

.submit-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-btn:hover:not(:disabled) {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Success Modal */
.success-modal {
    text-align: center;
    padding: 3rem 2rem;
}

.success-icon {
    width: 100px;
    height: 100px;
    background: var(--success);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin: 0 auto 1.5rem;
    animation: scaleIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes scaleIn {
    0% { transform: scale(0); }
    100% { transform: scale(1); }
}

.success-modal h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--success);
}

.order-details {
    background: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    transform: scale(1.02);
}

/* Toast */
.toast {
    position: fixed;
    top: 100px;
    right: -400px;
    background: var(--white);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 4000;
    min-width: 300px;
}

.toast.show {
    right: 20px;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

/* Overlay */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1500;
}

.overlay.active {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.5rem;
    }
    
    .cart-sidebar {
        width: 100%;
        right: -100%;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}