Order tool: fan funding; deck: light and dark, 60/40 shareholding

User, 20 Oct 2026: can the deck also be made in a light and dark mode;
the new order tool should also offer fan funding, so the platform
screenshots match and use the same calculator; the main investor holds
at least 60 %, so 40 % is for sale.

Order tool (docs/order.html, /demos/order/):
- New step 15 "How to pay": pay the plant directly (deposit) or let
  fans fund it; step 16 becomes "Review & launch" with the campaign
  simulation and its three outcomes.
- Campaign maths ported from make-a-record (fan price, length, cap, own
  copies, VAT; fans needed = max(100, break-even); keep at the goal and
  with more fans; price hint); R gains fee (3.5 %), VAT and campaign
  length with sources; no price changed.
- Quote card shows fan price, fans needed and the artist's keep on the
  fan route; route and campaign in the #q= hash; deep links
  #s=<step>&p=<preset>&route=fans.
- Parity with make-a-record: 206/206 checks over 40 configurations;
  default quotes unchanged (37,836 / 217 / 102,936 THB; partner
  mastering 43,676).

Investor deck (docs/pitch/):
- Light and dark theme like the other site pages (cnx-theme, T key and
  button), presenter and overview follow; charts from CSS variables;
  text pairs at WCAG AA in both themes; tool screenshots in both themes.
- Two PDFs: dark and light (print-friendly), each ~1.5 MB.
- Platform slide: both pictures from the order tool (Splatter 12" order
  step and its fan-funding view: 100 fans at 1,200 THB, break-even 46,
  ~480 THB a copy kept).
- BOI and financing slide: shareholding bar, lead investor at least 60 %,
  at most 40 % for co-investors (~32M / ~22M THB at the ~54M equity
  floor, arithmetic only); the ask offers up to 40 %.

Docs: artist-platform.md (fan funding in the order tool), README and
landing page entries.

docs/artist-platform.md

@@ -57,11 +57,27 @@ demo, so a rate change goes into both pages.
 plant's online order form: a rail of numbered steps (order type, size,
 discs, vinyl colour and effects, labels, inner sleeves, jacket and
 finish, extras, mastering and cutting, test pressings, shipping, track
-list, artwork, review), each step's choices beside a large live picture
-of the record, and a running price and ship date. The review lists what
-is still missing before an order can be placed and links to fan funding
-in the detailed demo. It carries the same price list, so a rate change
-goes into all three pages.
+list, artwork, how to pay, review), each step's choices beside a large
+live picture of the record, and a running price and ship date. The review
+lists what is still missing before an order can be placed. It carries the
+same price list, so a rate change goes into all three pages.
+
+**Fan funding in the order tool** (user, 20 October 2026: the new tool
+offers fan funding too, so the investor deck's platform pictures come
+from one tool and one calculator). Step 15 "How to pay" chooses between
+paying the plant directly (the deposit, the rest before dispatch) and a
+fan-funded campaign with the same inputs and the same campaign maths as
+[make-a-record](make-a-record.html): the artist sets the fan price
+(default 1,200 THB) and the campaign length, the fans needed are the
+larger of break-even and the 100-copy minimum run, and the tool shows
+what the artist keeps at the goal and with more fans, after the payment
+fees (~3.5 %, to confirm with the provider), the one-off setup and the
+pressing. Step 16 becomes "Review & launch" and simulates the campaign's
+outcome. For the same record both pages give the same numbers (checked
+headless over 40 combinations, October 2026): the default record at
+1,200 THB needs 100 fans (break-even 41) and keeps ~548 THB a copy; the
+Splatter 12" preset needs 100 fans (break-even 46) and keeps ~480 THB a
+copy. Indicative demo prices.
 
 **Mastering as a choice** (user, October 2026): the order tool lets the
 customer pick the mastering: none (the master is final and only prepared