nginx.conf

server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;
    
    # Security headers
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https://*.supabase.co https://api.openai.com;" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()";
    
    # Prevent access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location / {
        try_files $uri $uri/ /index.html;
        expires -1;
        
        # Enable compression
        gzip on;
        gzip_vary on;
        gzip_min_length 10240;
        gzip_proxied expired no-cache no-store private auth;
        gzip_types text/plain text/css text/xml text/javascript application/javascript application/x-javascript application/xml;
        gzip_disable "MSIE [1-6]\.";
    }

    # Cache static assets
    location /assets {
        expires 1y;
        add_header Cache-Control "public, no-transform";
        access_log off;
    }
    
    # Deny access to sensitive files
    location ~ \.(env|log|git|yml|yaml|xml|ini|json)$ {
        deny all;
    }
}