/* =============================================================
   hall.css — the Hall of Dust, applied site-wide.

   The landing page reached this look through `body.museum` in
   site.css. The three consoles arrived here from three different
   palettes — O.B.L.I.V.I.O.N.'s blue-grey slab, Gaslight's
   phosphor green, the Decoder's warm paper — and each of those
   had its own token vocabulary. Rather than rename tokens across
   three documents, each console's own `:root` block was retuned
   to these values in place, so the files stay readable on their
   own terms. This file carries only what is genuinely SHARED:
   the palette of record, the type stack, and the chrome that
   makes every page feel like one room — grain, vignette,
   scrollbar, selection, and the dust layer.

   Palette of record, lifted from the Eidolon study:
     hall #0b0a0c   hall-2 #131117   hall-3 #1b1820
     bone #efe7d6   bone-dim #b8b0a3  bone-faint #6d675e
     amber #d79d4a  amber-deep #b47a2f
     plaque rgba(18,15,12,.8)  rule rgba(215,154,74,.35)
     ease cubic-bezier(.22,1,.36,1)
   ============================================================= */

:root {
  --h-hall:       #0b0a0c;
  --h-hall-2:     #131117;
  --h-hall-3:     #1b1820;
  --h-bone:       #efe7d6;
  --h-bone-dim:   #b8b0a3;
  --h-bone-faint: #6d675e;
  --h-amber:      #d79d4a;
  --h-amber-deep: #b47a2f;
  --h-amber-lit:  #e8bd7f;
  --h-rust:       #c9552e;   /* the one alarm hue; sienna, not fire-engine */
  --h-ash:        #9c8e77;   /* secondary marker where a third hue is needed */
  --h-on-amber:   #16100a;   /* text that sits ON amber */
  --h-plaque:     rgba(18, 15, 12, 0.8);
  --h-rule:       rgba(215, 154, 74, 0.35);
  --h-rule-soft:  rgba(215, 154, 74, 0.18);
  --h-wash:       rgba(215, 157, 74, 0.06);
  --h-ease:       cubic-bezier(.22, 1, .36, 1);

  --h-display: "Fraunces", Georgia, "Times New Roman", serif;
  --h-sans:    "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --h-mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

/* -------------------------------------------------------------
   The room itself. A single warm bloom high on the wall over
   near-black, exactly as the reference stages it.
   ------------------------------------------------------------- */
body.hall {
  background:
    radial-gradient(ellipse 80% 55% at 50% 18%, rgba(215, 157, 74, .05), transparent 60%),
    var(--h-hall);
  background-attachment: fixed;
  color: var(--h-bone);
}

/* Film grain + vignette over everything. Fixed, non-interactive,
   and deliberately NOT a backdrop-filter — see the dungeon perf
   study: live blur over an animating canvas cost 48fps. */
body.hall::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .012) 0 1px, transparent 1px 3px),
    radial-gradient(ellipse 100% 92% at 50% 50%, transparent 58%, rgba(0, 0, 0, .45) 100%);
}

body.hall ::selection { background: var(--h-amber); color: var(--h-on-amber); }

body.hall ::-webkit-scrollbar { width: 9px; height: 9px; }
body.hall ::-webkit-scrollbar-track { background: rgb(6, 5, 6); }
body.hall ::-webkit-scrollbar-thumb {
  background: rgb(42, 38, 32);
  border: 2px solid rgb(6, 5, 6);
  border-radius: 9px;
}
body.hall ::-webkit-scrollbar-thumb:hover { background: rgb(66, 57, 44); }
body.hall { scrollbar-color: rgb(42, 38, 32) rgb(6, 5, 6); scrollbar-width: thin; }

/* -------------------------------------------------------------
   The dust layer (assets/js/dust.js draws into this).
   z-index 0 puts it behind page content but above the ground.
   Every console sets its own content stacking above 0.
   ------------------------------------------------------------- */
#dust {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: block;
}

/* Shared display type, opt-in per element. Deliberately NOT a blanket
   `body.hall h2` rule: both consoles use small tracked-out monospace for
   section labels, and a blanket serif silently swallowed them. */
body.hall .hall-display {
  font-family: var(--h-display);
  letter-spacing: -0.015em;
}

/* A caption style used across pages for the small caps runs. */
body.hall .hall-cap {
  font-family: var(--h-mono);
  font-size: 9.5px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--h-bone-faint);
}

@media (prefers-reduced-motion: reduce) {
  #dust { display: none; }
}