Puzzle hints

01 / THE CARRIER

The last light stays on the water after the sun has gone.
Its name is the key, carried on a signal half an alphabet away:

  ROT13: nsgretybj

Turn each letter thirteen places. Keep going from A after Z. Case does not
matter; punctuation stays still. The decoded word is your guest password.

Need a hand with the dial? cat ~/clues/02-rotation.txt

02 / ROTATE THE ALPHABET

ROT13 replaces A with N, B with O, and so on. Applying it twice returns the
original letters. Our signal has nine letters:

  nsgretybj

Let the shell turn the dial:
  printf '%s\n' nsgretybj | tr 'A-Za-z' 'N-ZA-Mn-za-m'

Use the decoded word when sudo asks for guest's password. Password input is
hidden in a Unix terminal; the lack of dots or stars is normal.

  sudo su

Want the answer directly? cat ~/clues/03-open-door.txt

03 / OPEN THE DOOR

The answer is afterglow.

This is a public puzzle answer for a temporary browser machine. Type:
  sudo su

At the password prompt, type afterglow and press Enter. Characters will not
appear as you type. A root prompt ends with #. You can then open /site:

  cd /site
  nano pages/about.txt
  bash galleries/sunset/show.sh

Use Ctrl+O, Enter to save a page, and Ctrl+X to exit nano. The editor buttons
on a phone send those same keys. Nothing you change here is published;
starting a fresh session restores the original files and guest privileges.

The public content reader in the website menus opens the same published
pages and galleries directly, with no password or terminal required.