components/loader.js

class LoaderComponent extends HTMLElement {
    constructor() {
        super();
    }

    connectedCallback() {
        this.attachShadow({ mode: 'open' });
        this.render();
    }

    render() {
        this.shadowRoot.innerHTML = `
            <style>
                * {
                    margin: 0;
                    padding: 0;
                    box-sizing: border-box;
                }
                
                :host {
                    display: contents;
                }
                
                .loader-grid {
                    display: grid;
                    grid-template-columns: repeat(1, 1fr);
                    gap: 1.5rem;
                }
                
                @media (min-width: 768px) {
                    .loader-grid {
                        grid-template-columns: repeat(2, 1fr);
                    }
                }
                
                @media (min-width: 1024px) {
                    .loader-grid {
                        grid-template-columns: repeat(3, 1fr);
                    }
                }
                
                .skeleton-card {
                    background: white;
                    border-radius: 1rem;
                    overflow: hidden;
                    border: 1px solid #e5e7eb;
                }
                
                :host-context(.dark) .skeleton-card {
                    background: #1f2937;
                    border-color: #374151;
                }
                
                .skeleton-image {
                    height: 12rem;
                    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
                    background-size: 200% 100%;
                    animation: shimmer 1.5s infinite;
                }
                
                :host-context(.dark) .skeleton-image {
                    background: linear-gradient(90deg, #374151 25%, #4b5563 50%, #374151 75%);
                    background-size: 200% 100%;
                }
                
                .skeleton-content {
                    padding: 1.25rem;
                }
                
                .skeleton-line {
                    height: 0.75rem;
                    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
                    background-size: 200% 100%;
                    animation: shimmer 1.5s infinite;
                    border-radius: 0.25rem;
                    margin-bottom: 0.75rem;
                }
                
                :host-context(.dark) .skeleton-line {
                    background: linear-gradient(90deg, #374151 25%, #4b5563 50%, #374151 75%);
                    background-size: 200% 100%;
                }
                
                .skeleton-line.short {
                    width: 60%;
                }
                
                .skeleton-line.title {
                    height: 1.25rem;
                    margin-bottom: 1rem;
                }
                
                @keyframes shimmer {
                    0% { background-position: 200% 0; }
                    100% { background-position: -200% 0; }
                }
            </style>
            
            <div class="loader-grid">
                ${Array(6).fill(0).map(() => `
                    <div class="skeleton-card">
                        <div class="skeleton-image"></div>
                        <div class="skeleton-content">
                            <div class="skeleton-line short"></div>
                            <div class="skeleton-line title"></div>
                            <div class="skeleton-line"></div>
                            <div class="skeleton-line short"></div>
                        </div>
                    </div>
                `).join('')}
            </div>
        `;
    }
}

customElements.define('loader-component', LoaderComponent);