components/header.js

class AppHeader extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({ mode: 'open' });
    }

    connectedCallback() {
        this.render();
        this.setupEventListeners();
    }

    render() {
        this.shadowRoot.innerHTML = `
            <style>
                header {
                    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
                    color: var(--text-primary);
                    padding: 1rem 0;
                    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
                    border-bottom: 1px solid var(--border-color);
                }
.header-container {
                    max-width: 1200px;
                    margin: 0 auto;
                    padding: 0 1rem;
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                }
                
                .app-title {
                    cursor: pointer;
                    display: flex;
                    align-items: center;
                    gap: 0.5rem;
                    transition: transform 0.2s;
                }
                
                .app-title:hover {
                    transform: scale(1.02);
                }
                
                .app-title:active {
                    transform: scale(0.98);
                }
                
                .app-name {
                    font-size: 1.5rem;
                    font-weight: 700;
                    letter-spacing: -0.5px;
                }
                .app-subtitle {
                    font-size: 0.75rem;
                    opacity: 0.7;
                    margin-top: 0.125rem;
                    color: var(--text-secondary);
                }
                .model-selector {
                    background: var(--bg-secondary);
                    border: 1px solid var(--border-color);
                    color: var(--text-primary);
                    padding: 0.5rem 1rem;
                    border-radius: 8px;
                    font-size: 0.875rem;
                    cursor: pointer;
                    transition: all 0.2s;
                }
                
                .model-selector:hover {
                    background: var(--bg-tertiary);
                    border-color: var(--primary-color);
                }
                
                .model-selector:focus {
                    outline: 2px solid var(--primary-color);
                    outline-offset: 2px;
                }
                
                .model-selector:disabled {
                    opacity: 0.5;
                    cursor: not-allowed;
                }
                
                .model-selector option {
                    background: var(--bg-secondary);
                    color: var(--text-primary);
                    border: 1px solid var(--border-color);
                }
@media (max-width: 640px) {
                    .header-container {
                        flex-direction: column;
                        gap: 1rem;
                    }
                    
                    .app-name {
                        font-size: 1.25rem;
                    }
                    
                    .model-selector {
                        width: 100%;
                    }
                }
            </style>
            
            <header>
                <div class="header-container">
                    <div class="app-title" role="button" aria-label="New chat">
                        <div>
                            <div class="app-name">Claude AI Chat</div>
                            <div class="app-subtitle">Powered by Puter.js</div>
                        </div>
                    </div>
                    
                    <select class="model-selector" aria-label="Select AI model">
                        <option value="claude-sonnet-4-5">Claude Sonnet 4.5</option>
                        <option value="claude-sonnet-4">Claude Sonnet 4</option>
                        <option value="claude-opus-4-1">Claude Opus 4.1</option>
                        <option value="claude-opus-4">Claude Opus 4</option>
                        <option value="claude-haiku-4-5">Claude Haiku 4.5</option>
                    </select>
                </div>
            </header>
        `;
    }

    setupEventListeners() {
        // App title click - new chat
        const appTitle = this.shadowRoot.querySelector('.app-title');
        appTitle.addEventListener('click', () => {
            if (window.claudeApp) {
                window.claudeApp.newChat();
            }
        });

        // Model selector change
        const modelSelector = this.shadowRoot.querySelector('.model-selector');
        
        // Set initial value
        if (window.claudeApp) {
            modelSelector.value = window.claudeApp.selectedModel;
        }
        
        modelSelector.addEventListener('change', (e) => {
            if (window.claudeApp) {
                window.claudeApp.changeModel(e.target.value);
            }
        });
        
        // Update model selector when app state changes
        if (window.claudeApp) {
            const originalChangeModel = window.claudeApp.changeModel.bind(window.claudeApp);
            window.claudeApp.changeModel = (newModel) => {
                originalChangeModel(newModel);
                modelSelector.value = newModel;
            };
        }
    }
}

customElements.define('app-header', AppHeader);