server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Enable gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss image/svg+xml;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Block access to sensitive files and directories
    location ~ /\. {
        deny all;
        return 404;
    }

    location ~ \.(env|git|gitignore|dockerignore)$ {
        deny all;
        return 404;
    }

    location ~ ^/(node_modules|\.git|\.vscode|package\.json|package-lock\.json|vite\.config|tsconfig\.json)/? {
        deny all;
        return 404;
    }

    # SPA fallback - serve index.html for all non-file routes
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}