/* --------------------------------------------------------------- sprites -- */

/* Fairies and salamanders playing in the shrubs — see src/components/Sprites.js.
   The shrubs are the typography, so these ride real word boxes: perching on a
   word, ringing it, ducking behind it, chasing one another between lines.

   They EMIT. An earlier version blended day sprites with multiply, which
   darkens — so on parchment they were literally dark specks, and dark specks
   crawling on a page are flies. Light is the entire brief: hot core, saturated
   bloom, and a star glint on the flares. */

.sprites {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 3;
    overflow: hidden;
}

.sprite {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    will-change: transform, opacity;
}

.sprite > * {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) scale(var(--sprite-scale, 1));
    border-radius: 50%;
    pointer-events: none;
}

/* The bloom: wide, soft, saturated. This is the colour you read. */
.sprite-halo {
    width: 30px;
    height: 30px;
    background: radial-gradient(circle, currentColor 0%, color-mix(in srgb, currentColor 45%, transparent) 38%, transparent 70%);
    filter: blur(5px);
    opacity: calc(0.34 + var(--flare, 0) * 0.46);
}

/* The filament: small and hotter than anything behind it. A light source has a
   white centre — that is what separates "emitting" from "coloured dot". */
.sprite-core {
    width: 7px;
    height: 7px;
    background: radial-gradient(circle,
        #fffdf2 0%,
        color-mix(in srgb, currentColor 88%, #fffdf2) 46%,
        transparent 74%);
    filter: blur(1.1px);
    opacity: calc(0.7 + var(--flare, 0) * 0.3);
}

/* The twinkle. A four-point glint is what makes the eye call something a
   sparkle rather than a pulse, so it rides the flare and is absent otherwise. */
.sprite-glint {
    width: 46px;
    height: 46px;
    opacity: calc(var(--flare, 0) * 0.85);
    background:
        linear-gradient(90deg, transparent 12%, color-mix(in srgb, currentColor 80%, transparent) 50%, transparent 88%),
        linear-gradient(0deg, transparent 18%, color-mix(in srgb, currentColor 62%, transparent) 50%, transparent 82%);
    background-size: 100% 1.5px, 1.5px 100%;
    background-position: center, center;
    background-repeat: no-repeat;
    filter: blur(0.7px);
    border-radius: 0;
}

/* No blend modes anywhere in here, and that is not a preference.
   .sprites is position:fixed with a z-index, which makes it an isolated
   stacking context, so its children blend against THAT transparent layer and
   never against the page behind it. plus-lighter therefore produced the raw
   colour composited normally — which is how a dim amber meant to ADD light
   ended up subtracting 96 luminance from parchment.

   So a sprite brightens the page the only way that survives isolation: by
   being brighter than what is behind it. Which half it is over decides the
   palette, carried per sprite as a class because the layer sits outside both
   wrappers and they cross the boundary independently. */

.sprite-creek { color: var(--biolume-core); }
.sprite-sage { color: var(--spore); }
.sprite-lantern { color: var(--lantern); }

/* Day. Parchment sits at luminance ~213, so a day sprite has to clear that to
   register as light at all — saturated amber is ~187 and reads as a speck of
   dirt on the paper. These are gold at the top of the range: brighter than the
   page, still warm. Verified by .dream-loop/spritelight.mjs, which fails if a
   sprite does not raise the luminance under it on BOTH halves. */
.sprite.is-day.sprite-creek { color: #fff0bf; }
.sprite.is-day.sprite-sage { color: #ffeaad; }
.sprite.is-day.sprite-lantern { color: #fff8dc; }

.sprite.is-day .sprite-halo {
    filter: blur(3.4px);
    opacity: calc(0.8 + var(--flare, 0) * 0.2);
    background: radial-gradient(circle, currentColor 0%, color-mix(in srgb, currentColor 72%, transparent) 50%, transparent 76%);
}
.sprite.is-day .sprite-core {
    width: 8px;
    height: 8px;
    background: radial-gradient(circle, #ffffff 0%, #fffbe8 52%, color-mix(in srgb, currentColor 70%, transparent) 78%, transparent 92%);
    opacity: calc(0.9 + var(--flare, 0) * 0.1);
}

@media (max-width: 900px) { .sprites { display: none; } }
@media (prefers-reduced-motion: reduce) { .sprites { display: none; } }