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

    # 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 image/svg+xml;

    # Health check endpoint para monitorización
    location = /health {
        access_log off;
        add_header Content-Type text/plain;
        return 200 'OK';
    }

    # robots.txt - servir directamente
    location = /robots.txt {
        default_type text/plain;
        try_files $uri =404;
    }

    # sitemap.xml - servir directamente
    location = /sitemap.xml {
        default_type application/xml;
        try_files $uri =404;
    }

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

    # Cache para HTML (5 minutos)
    location ~* \.html$ {
        expires 5m;
        add_header Cache-Control "public, must-revalidate";
    }

    # SPA fallback (solo para rutas que no existen)
    location / {
        try_files $uri $uri/ $uri/index.html /index.html;
    }

    # 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;
}