/* ===========================================================================
   VARIANT A · "ink" — the near-black warm ground.

   Niko, 12 Oct: "This page is okay. I just wanted a darker background."
   So nothing about the layout, the type, the players, the photographs or the
   copy moves. Only the ground, and the things that must follow a ground to
   stay legible on it.

   The move is a straight role swap, not a new design: what was bone becomes
   ink and what was ink becomes bone. The hue is kept — this ground is the
   same warm family as the bone it replaces (both sit around 40-45 degrees in
   oklch), so the red that was keyed to the bone is still keyed to its hue
   family and only its lightness stop has to move.

   THE PEAK INVERTS WITH THE PAGE. The eclipse act owned the page's largest
   luminance jump by being the only black sheet on a bone page. On an ink page
   a blacker sheet is no event at all: #07070A against #141210 is a 0.004
   luminance step, which is nothing. So the peak flips to the LIGHT event —
   the eclipse sheet goes bone with ink type — and the jump is preserved in
   the other direction, measured below.
   ======================================================================== */

:root {
  /* The ground. #141210 is warm near-black: 2 points of red over blue, which
     is enough to read as ink on paper stock rather than as a screen's grey.
     Relative luminance 0.00675, so bone type on it measures 15.1:1. */
  --sc-canvas:     #141210;
  /* One step UP from the ground, not down: on a dark page a "surface" is a
     raised plate, and a darker panel on near-black is a hole. #201C19. */
  --sc-surface:    #201C19;
  --sc-ink:        #EFE9DD;   /* the bone the page used to be printed on */
  --sc-ink-soft:   #B3A996;   /* 8.52:1 on the ground. Tinted to the ground's hue. */

  /* The leader red, lighter stop. #b8321a is 2.21:1 on this ground and fails
     everything; the brief's #E8613F measures 5.51:1 here, which clears the
     4.5 floor for every size including the small-caps meta lines. Same hue as
     the original (around 20 degrees), one lightness stop up, exactly the
     two-stop rule the bone build already used for its black sheet. */
  --sc-accent:     #E8613F;
  --sc-accent-ink: #141210;   /* ink ON the accent, for ::selection */

  --sc-font-display: "Anton", "Haettenschweiler", "Arial Narrow", system-ui, sans-serif;
  --sc-font-text:    "Instrument Serif", "Iowan Old Style", Georgia, serif;

  /* The fold shadow. On a dark ground a darker shadow is invisible, so the
     fold's shade becomes a LIGHT bloom at low alpha — the same gesture,
     carried by the only tone that can carry it here. */
  --fold-shade: 239, 233, 221;

  /* THE INVERTED SHEET IS NOW THE LIGHT ONE. The names stay --black-* because
     index.html's selectors are .sheet--black / .act--black and this file may
     not touch index.html. Only what they MEAN flips. */
  --black-ground: #EFE9DD;    /* bone. The peak is the light event. */
  --black-ink:    #141210;    /* 15.1:1 on bone */
  --black-soft:   #4A443C;    /* 7.96:1 on bone — the measured value from the
                                 bone build, reused because the stock is the
                                 same bone it was measured against. */
  --black-accent: #9E2A16;    /* 6.21:1 on bone — likewise the measured value. */
}