nginx.conf

server {
    listen 80;
    server_name localhost;
    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 Referrer-Policy "strict-origin-when-cross-origin";
    add_header Content-Security-Policy "default-src 'self' https://*.supabase.co; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.supabase.co; img-src 'self' data: https://*.supabase.co; connect-src 'self' https://*.supabase.co wss://*.supabase.co;";

    # Cache static assets
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, no-transform";
    }

    # Service worker path
    location /sw.js {
        add_header Cache-Control "no-cache";
        expires 0;
    }

    # Handle SPA routing
    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache";
    }
}