/* ==========================================================================
   Dragon Ball Clash Action TCG — Atmospheric Effects
   CSS-only floating Ki particles, vignettes, energy wisps & scan lines
   ========================================================================== */

/* ── 1. Arena Ambient Ki Particles ────────────────────────────────────────── */
#arena-screen::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image:
    radial-gradient(2px 2px at 15% 20%, rgba(255,215,0,0.5) 50%, transparent 100%),
    radial-gradient(2px 2px at 45% 65%, rgba(0,200,255,0.4) 50%, transparent 100%),
    radial-gradient(1.5px 1.5px at 78% 30%, rgba(255,215,0,0.35) 50%, transparent 100%),
    radial-gradient(2.5px 2.5px at 88% 75%, rgba(0,242,254,0.3) 50%, transparent 100%),
    radial-gradient(1px 1px at 25% 85%, rgba(255,140,0,0.4) 50%, transparent 100%),
    radial-gradient(1.5px 1.5px at 62% 12%, rgba(255,255,255,0.25) 50%, transparent 100%),
    radial-gradient(2px 2px at 35% 45%, rgba(0,200,255,0.3) 50%, transparent 100%),
    radial-gradient(1px 1px at 90% 50%, rgba(255,215,0,0.3) 50%, transparent 100%);
  animation: floatParticles 12s ease-in-out infinite alternate;
}

@keyframes floatParticles {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0.5;
  }
  33% {
    opacity: 0.8;
  }
  66% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-20px) translateX(8px);
    opacity: 0.4;
  }
}

/* ── 2. Arena Cinematic Vignette ──────────────────────────────────────────── */
#arena-screen::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(4, 6, 12, 0.5) 100%);
}

/* ── 3. Landing Page Floating Stars ──────────────────────────────────────── */
@keyframes twinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

@keyframes driftUp {
  0% { transform: translateY(100vh) scale(0.5); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 0.7; }
  100% { transform: translateY(-20vh) scale(1); opacity: 0; }
}

/* Energy wisps for landing page atmosphere */
.landing-energy-wisps {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.landing-energy-wisps::before,
.landing-energy-wisps::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(30px);
  animation: floatParticles 10s ease-in-out infinite alternate;
}

.landing-energy-wisps::before {
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(255,215,0,0.12) 0%, transparent 70%);
  top: 20%;
  left: 15%;
}

.landing-energy-wisps::after {
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(0,200,255,0.10) 0%, transparent 70%);
  bottom: 30%;
  right: 20%;
  animation-delay: -5s;
}

/* ── 4. Arena Subtle Scan Lines ──────────────────────────────────────────── */
.arena-scan-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 3px,
    rgba(0, 0, 0, 0.04) 3px,
    rgba(0, 0, 0, 0.04) 4px
  );
  opacity: 0.3;
}

/* ── 5. Phase Transition Flash ───────────────────────────────────────────── */
@keyframes phaseFlash {
  0% { opacity: 0; }
  15% { opacity: 0.15; }
  100% { opacity: 0; }
}

.phase-transition-flash {
  position: absolute;
  inset: 0;
  background: white;
  pointer-events: none;
  z-index: 100;
  opacity: 0;
  animation: phaseFlash 0.5s ease-out forwards;
}

/* ── 6. Power Level Aura (wraps around fighter HUD when Ki is full) ──── */
@keyframes auraFlare {
  0%, 100% {
    box-shadow: 0 0 15px rgba(255,215,0,0.2), 0 0 30px rgba(255,215,0,0.1);
  }
  50% {
    box-shadow: 0 0 25px rgba(255,215,0,0.35), 0 0 50px rgba(255,215,0,0.15), 0 0 80px rgba(255,215,0,0.05);
  }
}

.fighter-hud.ki-full {
  animation: auraFlare 2s ease-in-out infinite;
  border-color: rgba(255,215,0,0.2) !important;
}

/* ── 7. Hand Zone Premium Fan Arc Glow ───────────────────────────────────── */
.hand-zone::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255,215,0,0.15), rgba(0,200,255,0.1), transparent);
  border-radius: 50%;
  pointer-events: none;
}

/* ── 8. Drop Zone "Awaiting Card" Pulse ──────────────────────────────────── */
@keyframes dropZonePulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(255,215,0,0.03);
  }
  50% {
    box-shadow: 0 0 35px rgba(255,215,0,0.08), inset 0 0 20px rgba(255,215,0,0.03);
  }
}

.drop-zone:not(.drag-over) {
  animation: dropZonePulse 4s ease-in-out infinite;
}

/* ── 9. Glass Panel Enhancement ──────────────────────────────────────────── */
.glass {
  border: 1px solid rgba(255,255,255,0.06) !important;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.04) !important;
}

.glass:hover {
  border-color: rgba(255,255,255,0.1) !important;
}

/* ── Responsive: Hide heavy atmospheric effects on lower-end mobile ──── */
@media (max-width: 768px) {
  #arena-screen::before {
    opacity: 0.3;
  }

  .arena-scan-lines {
    display: none;
  }

  .landing-energy-wisps::before,
  .landing-energy-wisps::after {
    width: 60px;
    height: 60px;
    filter: blur(20px);
  }
}