/* ═══════════════════════════════════════════
   ABYSS — animated title screen background
   Swirling fog, pulsing vortex, living darkness.
   ═══════════════════════════════════════════ */

.screen--title {
  overflow: clip;
}

/* Base vortex glow — slow rotation behind everything */
.screen--title::before {
  content: '';
  position: absolute;
  inset: -50%;
  background:
    conic-gradient(from 0deg at 50% 55%,
      transparent 0deg,
      rgba(88, 28, 135, 0.35) 30deg,
      transparent 70deg,
      rgba(67, 56, 202, 0.25) 120deg,
      transparent 170deg,
      rgba(139, 92, 246, 0.3) 220deg,
      transparent 270deg,
      rgba(168, 85, 247, 0.2) 320deg,
      transparent 360deg
    );
  animation: vortex-spin 20s linear infinite;
  pointer-events: none;
  z-index: 0;
  filter: blur(30px);
}

/* Secondary swirl — counter-rotation, warm tones */
.screen--title::after {
  content: '';
  position: absolute;
  inset: -40%;
  background:
    conic-gradient(from 180deg at 45% 50%,
      transparent 0deg,
      rgba(251, 191, 36, 0.15) 50deg,
      transparent 100deg,
      rgba(244, 63, 94, 0.18) 180deg,
      transparent 230deg,
      rgba(249, 115, 22, 0.12) 310deg,
      transparent 360deg
    );
  animation: vortex-spin 28s linear infinite reverse;
  pointer-events: none;
  z-index: 0;
  filter: blur(35px);
}

@keyframes vortex-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Fog wisps — drifting layers */
.abyss-fog {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.abyss-fog__wisp {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0;
  animation: wisp-drift var(--dur) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes wisp-drift {
  0% {
    opacity: 0;
    transform: translate(0, 0) scale(0.8);
  }
  20% {
    opacity: var(--peak-o, 0.15);
  }
  50% {
    opacity: var(--peak-o, 0.15);
    transform: translate(var(--dx), var(--dy)) scale(1.2);
  }
  80% {
    opacity: var(--peak-o, 0.15);
  }
  100% {
    opacity: 0;
    transform: translate(calc(var(--dx) * 2), calc(var(--dy) * 2)) scale(0.8);
  }
}

/* Pulsing core — center glow breathes */
.abyss-core {
  position: absolute;
  width: 500px;
  height: 500px;
  left: 50%;
  top: 45%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(139, 92, 246, 0.25) 0%,
    rgba(88, 28, 135, 0.15) 25%,
    rgba(67, 56, 202, 0.06) 50%,
    transparent 70%
  );
  animation: core-pulse 6s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
  filter: blur(25px);
}

@keyframes core-pulse {
  0%, 100% {
    opacity: 0.5;
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.15);
  }
}

/* Depth vignette — stronger than game vignette */
.screen--title .abyss-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at 50% 50%,
    transparent 20%,
    rgba(6, 6, 18, 0.4) 55%,
    rgba(6, 6, 18, 0.85) 100%
  );
  pointer-events: none;
  z-index: 2;
}

/* ─── Streaks — sharp lines spiraling from center ─── */
.abyss-streak {
  position: absolute;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(168, 85, 247, 0.5) 30%,
    rgba(255, 255, 255, 0.6) 50%,
    rgba(139, 92, 246, 0.4) 70%,
    transparent 100%
  );
  transform-origin: 50% 0%;
  opacity: 0;
  animation: streak-fly var(--dur) linear infinite;
  animation-delay: var(--delay);
  pointer-events: none;
  z-index: 1;
}

@keyframes streak-fly {
  0% {
    opacity: 0;
    height: 0;
    transform: rotate(var(--angle)) translateY(0);
  }
  10% {
    opacity: 0.7;
    height: var(--len);
  }
  60% {
    opacity: 0.4;
  }
  100% {
    opacity: 0;
    height: var(--len);
    transform: rotate(var(--angle)) translateY(var(--dist));
  }
}

/* Ensure title content sits above abyss layers */
.screen--title > *:not(.abyss-fog):not(.abyss-core):not(.abyss-vignette) {
  position: relative;
  z-index: 3;
}