server {
    listen 80 default_server;
    listen [::]:80 default_server;

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

    # Gzip
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/json
        application/xml
        application/xml+rss
        application/manifest+json
        image/svg+xml;

    # Security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Healthcheck endpoint for Coolify / Docker
    location = /healthz {
        access_log off;
        add_header Content-Type text/plain;
        return 200 "ok\n";
    }

    # Service worker must never be cached (PWA updates rely on this)
    location = /sw.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        expires 0;
        try_files $uri =404;
    }

    location = /registerSW.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        expires 0;
        try_files $uri =404;
    }

    location = /manifest.webmanifest {
        add_header Cache-Control "no-cache";
        types { } default_type "application/manifest+json";
        try_files $uri =404;
    }

    # Hashed build assets — safe to cache for a year
    location /assets/ {
        access_log off;
        add_header Cache-Control "public, max-age=31536000, immutable";
        try_files $uri =404;
    }

    # Static images / icons — moderate cache
    location ~* \.(?:png|jpg|jpeg|gif|ico|svg|webp|avif|woff2?)$ {
        access_log off;
        add_header Cache-Control "public, max-age=604800";
        try_files $uri =404;
    }

    # SPA fallback — every other route serves index.html (uncached)
    location / {
        add_header Cache-Control "no-cache";
        try_files $uri $uri/ /index.html;
    }
}