/* Atmosphere overlay — soft time-of-day tint + seasonal tone. JS
   updates the CSS vars (--time-tint, --season-tint) every minute and
   sets body[data-phase] / body[data-season] for any tone-specific tweaks. */

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;       /* above noise, below content */
  pointer-events: none;
  background:
    linear-gradient(180deg, var(--time-tint, transparent) 0%, transparent 65%),
    radial-gradient(ellipse 100% 100% at 50% 50%, var(--season-tint, transparent), transparent 70%);
  mix-blend-mode: screen;
  opacity: 1;
  transition: background 30s ease-in-out;
}

/* Scene canvas itself gets a per-phase filter so the dark dusk shader
   actually brightens/cools/warms with time of day. */
#scene {
  filter: var(--scene-filter, none);
  transition: filter 30s ease-in-out;
}

/* phase blend modes — light phases SCREEN onto the dark scene
   (washes it lighter), darker phases use OVERLAY (deepens). */
body[data-phase="night"] .atmosphere      { mix-blend-mode: multiply; opacity: 0.85; }
body[data-phase="late-dusk"] .atmosphere  { mix-blend-mode: overlay;  opacity: 0.95; }
body[data-phase="dusk"] .atmosphere       { mix-blend-mode: overlay;  opacity: 1;    }
body[data-phase="dawn"] .atmosphere       { mix-blend-mode: screen;   opacity: 1;    }
body[data-phase="day"] .atmosphere        { mix-blend-mode: screen;   opacity: 1;    }
body[data-phase="midday"] .atmosphere     { mix-blend-mode: screen;   opacity: 1;    }

/* ─── Meteor / falling star on click ────────────────────── */
.meteor {
  position: fixed;
  width: 160px;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.9) 70%, #fff 100%);
  box-shadow:
    0 0 10px rgba(255, 255, 255, 0.85),
    0 0 24px rgba(180, 220, 255, 0.45);
  border-radius: 2px;
  pointer-events: none;
  z-index: 10;
  transform-origin: left center;
  transform: rotate(var(--meteor-angle, 35deg)) translateX(-160px) scaleX(0.2);
  opacity: 0;
  animation: meteor-fly 1.6s cubic-bezier(0.2, 0.7, 0.4, 1) forwards;
}
@keyframes meteor-fly {
  0%   { opacity: 0; transform: rotate(var(--meteor-angle, 35deg)) translateX(-160px) scaleX(0.2); }
  18%  { opacity: 1; }
  85%  { opacity: 1; }
  100% { opacity: 0; transform: rotate(var(--meteor-angle, 35deg)) translateX(440px) scaleX(1); }
}

@media (prefers-reduced-motion: reduce) {
  .atmosphere { transition: none; }
  .meteor     { animation: none; opacity: 0; }
}