server {
    listen 80;
    server_name localhost;
    
    # Serve static files
    location / {
        root /usr/share/nginx/html;
        index index.html index.htm;
        try_files $uri $uri/ /index.html;
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
        add_header Access-Control-Allow-Headers 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
    }
    
    # Explicitly handle asset files
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
        root /usr/share/nginx/html;
        expires 30d;
        add_header Cache-Control "public, max-age=2592000";
        add_header Access-Control-Allow-Origin *;
    }
    
    # Error pages
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}