/* ---- ArcadeKit shared styles (js/arcadeKit.js) --------------------------------
   The particle-burst overlay and the reusable difficulty-select screen every
   upgraded game shares. Themed onto the app's dark storm UI (var(--accent) etc.
   from styles.css). Kept generic — no per-game names. */

/* Screen-space particle pops from ArcadeKit.burst(). Above the games, below the
   storm HUD's floating "+1,234" labels (z 10000) is fine — these are ambient. */
.ak-fx {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  overflow: hidden;
}
.ak-p {
  position: absolute;
  left: 0;
  top: 0;
  will-change: transform, opacity;
  transform: translate(-9999px, -9999px);
  line-height: 1;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.5));
}

/* ---- Difficulty-select overlay (ArcadeKit.tierSelect) ---- */
.ak-tier {
  position: fixed;
  inset: 0;
  z-index: 10050;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: radial-gradient(120% 120% at 50% 30%, rgba(8, 12, 24, 0.72), rgba(2, 4, 10, 0.92));
  backdrop-filter: blur(3px);
  animation: akTierIn 0.22s ease-out both;
}
@keyframes akTierIn { from { opacity: 0; } to { opacity: 1; } }
.ak-tier-panel {
  width: min(720px, 100%);
  text-align: center;
}
.ak-tier-title {
  font-size: clamp(1.1rem, 3.5vw, 1.7rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: #f8fafc;
  text-shadow: 0 3px 14px rgba(0, 0, 0, 0.6);
  margin-bottom: 0.9rem;
}
.ak-tier-cards {
  display: flex;
  gap: 0.7rem;
  justify-content: center;
  flex-wrap: wrap;
}
.ak-tier-card {
  position: relative;
  flex: 1 1 150px;
  max-width: 210px;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem 0.7rem 0.8rem;
  border-radius: 1rem;
  border: 1px solid var(--border, rgba(148, 163, 184, 0.3));
  background: rgba(23, 32, 52, 0.85);
  color: #e2e8f0;
  cursor: pointer;
  transition: transform 0.12s, border-color 0.12s, background 0.12s, box-shadow 0.12s;
}
.ak-tier-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent, #f59e0b);
  box-shadow: 0 14px 34px -16px rgba(0, 0, 0, 0.8);
}
.ak-tier-card.ak-last {
  border-color: var(--accent, #f59e0b);
  box-shadow: 0 0 0 1px var(--accent, #f59e0b) inset;
}
.ak-tier-num {
  position: absolute;
  top: 0.5rem;
  left: 0.6rem;
  font-size: 0.7rem;
  font-weight: 800;
  opacity: 0.4;
}
.ak-tier-emoji { font-size: 2rem; line-height: 1; }
.ak-tier-name { font-size: 0.95rem; font-weight: 800; letter-spacing: 0.02em; }
.ak-tier-blurb { font-size: 0.72rem; opacity: 0.72; line-height: 1.25; flex: 1; }
.ak-tier-mult { font-size: 0.72rem; font-weight: 700; color: var(--accent, #f59e0b); }
.ak-tier-best { font-size: 0.66rem; opacity: 0.55; }
.ak-tier-card.ak-locked {
  cursor: not-allowed;
  opacity: 0.55;
  filter: grayscale(0.7);
}
.ak-tier-card.ak-locked:hover { transform: none; border-color: var(--border, rgba(148, 163, 184, 0.3)); box-shadow: none; }
.ak-tier-note {
  margin-top: 0.9rem;
  font-size: 0.74rem;
  opacity: 0.7;
  color: #cbd5e1;
}

@media (max-width: 560px) {
  .ak-tier-card { min-height: 132px; flex-basis: 120px; padding: 0.8rem 0.5rem; }
  .ak-tier-emoji { font-size: 1.6rem; }
}