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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.tagline {
    font-size: 1.1em;
    opacity: 0.9;
}

.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 20px;
    padding: 20px;
    min-height: 600px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.cart-section {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 2px solid #e9ecef;
}

.cart-section h2 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.3em;
}

.cart-items {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 15px;
}

.empty-cart {
    color: #6c757d;
    font-style: italic;
    text-align: center;
    padding: 20px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: white;
    border-radius: 8px;
    margin-bottom: 8px;
    border: 1px solid #dee2e6;
}

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

.cart-item-name {
    font-weight: 600;
    color: #333;
    font-size: 0.9em;
}

.cart-item-details {
    font-size: 0.8em;
    color: #6c757d;
    margin-top: 4px;
}

.cart-item-price {
    font-weight: 600;
    color: #667eea;
}

.cart-total {
    padding: 15px 0;
    border-top: 2px solid #dee2e6;
    font-size: 1.2em;
    color: #333;
}

.checkout-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.checkout-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.quick-actions {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 2px solid #e9ecef;
}

.quick-actions h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.1em;
}

.action-btn {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    background: white;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95em;
    transition: all 0.2s;
}

.action-btn:hover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateX(5px);
}

.chat-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.chat-container {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 2px solid #e9ecef;
    display: flex;
    flex-direction: column;
    height: 500px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background: white;
    border-radius: 8px;
    margin-bottom: 15px;
}

.message {
    margin-bottom: 15px;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    text-align: right;
}

.message.assistant {
    text-align: left;
}

.message-content {
    display: inline-block;
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 12px;
    line-height: 1.5;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message.assistant .message-content {
    background: #e9ecef;
    color: #333;
}

.chat-input-container {
    display: flex;
    gap: 10px;
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.2s;
}

.chat-input:focus {
    outline: none;
    border-color: #667eea;
}

.send-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.send-btn:hover {
    transform: translateY(-2px);
}

.products-section {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 2px solid #e9ecef;
}

.products-section h2 {
    margin-bottom: 20px;
    color: #333;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.product-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid #e9ecef;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.product-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3em;
}

.product-info {
    padding: 15px;
}

.product-name {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 1.1em;
}

.product-price {
    font-size: 1.2em;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 8px;
}

.product-details {
    font-size: 0.9em;
    color: #6c757d;
    margin-bottom: 10px;
}

.product-sizes {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 10px;
}

.size-badge {
    padding: 4px 8px;
    background: #e9ecef;
    border-radius: 4px;
    font-size: 0.85em;
    color: #333;
}

.size-badge.in-stock {
    background: #d4edda;
    color: #155724;
}

.product-actions {
    display: flex;
    gap: 10px;
}

.btn {
    flex: 1;
    padding: 8px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e9ecef;
    color: #333;
}

.btn-secondary:hover {
    background: #dee2e6;
}

.loading {
    text-align: center;
    padding: 20px;
    color: #6c757d;
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .sidebar {
        order: 2;
    }

    .chat-section {
        order: 1;
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}