/* Fundo lanterna (mesma lógica que index2) — usar dentro de .flashlight-bg */
.flashlight-bg {
  --mx: 50%;
  --my: 50%;
  --radius: 9rem;
  --soft: 55%;
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  min-height: 100dvh;
  pointer-events: none;
  isolation: isolate;
}

.flashlight-bg .layer {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.flashlight-bg .layer-back {
  z-index: 0;
  background-color: #1a1510;
  background-image:
    url("https://picsum.photos/id/10/1920/1280"),
    linear-gradient(160deg, #1e1814 0%, #0c0a08 100%);
}

.flashlight-bg .layer-glow {
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(
      circle calc(var(--radius) * 0.12) at var(--mx) var(--my),
      rgba(255, 252, 235, 0.65) 0%,
      rgba(255, 215, 140, 0.4) 45%,
      transparent 72%
    ),
    radial-gradient(
      circle calc(var(--radius) * 0.72) at var(--mx) var(--my),
      transparent 32%,
      rgba(255, 145, 55, 0.35) 48%,
      rgba(255, 95, 20, 0.18) 62%,
      transparent 78%
    ),
    radial-gradient(
      circle calc(var(--radius) * 1.12) at var(--mx) var(--my),
      transparent 50%,
      rgba(255, 170, 70, 0.12) 72%,
      transparent 92%
    );
  mix-blend-mode: soft-light;
}

.flashlight-bg .layer-glow.layer-glow--bloom {
  mix-blend-mode: screen;
  opacity: 0.42;
  background: radial-gradient(
    circle calc(var(--radius) * 0.55) at var(--mx) var(--my),
    rgba(255, 230, 190, 0.5) 0%,
    rgba(255, 160, 70, 0.15) 42%,
    transparent 68%
  );
}

/* Mesma superfície que a zona “não iluminada” quando a lanterna está ligada */
.flashlight-bg .layer-front,
body.with-flashlight-bg.lantern-off {
  background-color: #020617;
  background-image:
    linear-gradient(180deg, rgba(0, 0, 0, 0.65) 0%, rgba(15, 23, 42, 0.92) 100%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 8px,
      rgba(0, 0, 0, 0.12) 8px,
      rgba(0, 0, 0, 0.12) 9px
    );
}

body.with-flashlight-bg.lantern-off {
  background-attachment: fixed;
}

.flashlight-bg .layer-front {
  z-index: 2;
  -webkit-mask-image: radial-gradient(
    circle var(--radius) at var(--mx) var(--my),
    transparent 0%,
    transparent var(--soft),
    rgba(0, 0, 0, 1) 100%
  );
  mask-image: radial-gradient(
    circle var(--radius) at var(--mx) var(--my),
    transparent 0%,
    transparent var(--soft),
    rgba(0, 0, 0, 1) 100%
  );
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}

/* Só index2: barra e texto por cima */
.flashlight-bg .flashlight-toolbar {
  position: absolute;
  top: max(0.75rem, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 11;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.75rem;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(148, 163, 184, 0.25);
  backdrop-filter: blur(8px);
  pointer-events: auto;
}

.flashlight-bg .flashlight-toolbar label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: #cbd5e1;
  cursor: pointer;
}

.flashlight-bg .flashlight-toolbar input[type="range"] {
  width: 7rem;
  accent-color: #38bdf8;
}

.flashlight-bg .flashlight-toolbar a {
  color: #7dd3fc;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
}

.flashlight-bg .flashlight-toolbar a:hover {
  text-decoration: underline;
}

.flashlight-bg .flashlight-hint {
  position: absolute;
  left: 50%;
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  margin: 0;
  padding: 0.5rem 1rem;
  max-width: min(22rem, calc(100% - 2rem));
  font-size: 0.88rem;
  line-height: 1.45;
  text-align: center;
  color: rgba(226, 232, 240, 0.85);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.85);
  pointer-events: none;
  z-index: 10;
}

/* Página só com fundo: conteúdo por cima */
body.with-flashlight-bg > main {
  position: relative;
  z-index: 1;
}

/*
 * Android / tátil: mix-blend-mode + várias radiais custam muito à GPU.
 * Uma camada de brilho simples e sem bloom costuma ser fluida.
 */
@media (pointer: coarse) {
  .flashlight-bg .layer-glow.layer-glow--bloom {
    display: none;
  }

  .flashlight-bg .layer-glow {
    mix-blend-mode: normal;
    opacity: 0.45;
    background: radial-gradient(
      circle calc(var(--radius) * 0.65) at var(--mx) var(--my),
      rgba(255, 210, 150, 0.35) 0%,
      rgba(255, 140, 60, 0.12) 45%,
      transparent 70%
    );
  }

  .flashlight-bg .layer-front,
  body.with-flashlight-bg.lantern-off {
    background-image: linear-gradient(
      180deg,
      rgba(0, 0, 0, 0.65) 0%,
      rgba(15, 23, 42, 0.92) 100%
    );
  }

  .flashlight-bg .layer-front {
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
}