server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    charset utf-8;

    # Quartz-compatible URLs: /A/B -> A/B.html, /Folder/ -> Folder/index.html
    location / {
        try_files $uri $uri.html $uri/index.html =404;
    }

    # The notebooks listing builds to notebooks.html *and* has a sibling
    # notebooks/ directory of detail pages. try_files above resolves
    # /notebooks and /notebooks/<slug>, but not the trailing-slash form —
    # a bare directory has no index.html. Map it explicitly so every folder
    # URL on the site keeps working with or without the slash.
    location = /notebooks/ {
        try_files /notebooks.html =404;
    }

    location /assets/ {
        expires 7d;
        add_header Cache-Control "public";
    }

    # The ACannons browser build. gzip_static serves the .gz siblings that
    # export-cannons.sh writes, which is the difference between 3.3MB and 9MB
    # on the wire; nginx:alpine ships --with-http_gzip_static_module but has
    # `gzip on` COMMENTED OUT in its base config, so without this the page
    # would go out uncompressed and nothing would say so.
    #
    # no-cache, not `expires`: classes.js and cannons.wasm are stable
    # filenames whose contents change on every rebuild, so a long expiry would
    # serve a stale client against a fresh server until the cache aged out.
    # The browser still caches them and revalidates, which is a 304 and a few
    # bytes on an unchanged build.
    location /cn/ {
        gzip_static on;
        add_header Cache-Control "no-cache";
    }

    location /_astro/ {
        # content-hashed filenames — safe to cache hard
        expires 365d;
        add_header Cache-Control "public, immutable";
    }
}