server {
    listen 80 default_server;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # Gzip
    gzip on;
    gzip_types text/plain text/css text/javascript application/javascript application/json image/svg+xml;
    gzip_min_length 1024;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;

    # No cache for HTML (let users see changes after redeploy)
    location ~* \.html$ {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        expires 0;
    }

    # Long cache for static assets
    location ~* \.(jpg|jpeg|png|gif|webp|svg|woff|woff2|ttf|eot)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    location / {
        try_files $uri $uri/ /index.html;
    }
}