First pass was abstract gradient washes; the reference mock is the
synthwave sun/tower illustration itself behind frosted-glass panels.
Now: real artwork (public/archipelago-bg.jpg from the user's reference)
fills .main cover/fixed under a dark scrim, cards + sidebar are
translucent blurred glass with light hairline borders, coral accent and
is-active nav pill kept. Verified computed background stack in browser;
139 frontend tests + build green.
