* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  overflow: hidden;
  background: var(--color-forest-900);
  touch-action: none;
  font-family: var(--font-sans);
  color: var(--color-cream);
  -webkit-font-smoothing: antialiased;
}

canvas {
  display: block;
  cursor: default;
  touch-action: none;
}

/* Botón flotante glass reutilizable */
.ui-fab {
  position: fixed;
  z-index: 20;
  width: 48px;
  height: 48px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--color-cream);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition: background 0.22s ease, border-color 0.22s ease, transform 0.15s ease, box-shadow 0.22s ease;
}

.ui-fab i {
  font-size: 22px;
  line-height: 1;
}

.ui-fab:hover {
  background: rgba(61, 90, 62, 0.72);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-soft), var(--shadow-glow);
}

.ui-fab:active {
  transform: scale(0.94);
}

#loading {
  --loader-progress: 0%;
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  background:
    radial-gradient(ellipse 80% 60% at 50% 100%, rgba(79, 112, 79, 0.35) 0%, transparent 70%),
    linear-gradient(165deg, var(--color-forest-950) 0%, var(--color-forest-800) 48%, var(--color-forest-700) 100%);
  transition: opacity 0.7s ease, visibility 0.7s ease;
}

#loading.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader__content {
  width: min(380px, 88vw);
  padding: 40px 36px 34px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.loader__logo {
  display: block;
  width: min(210px, 62vw);
  height: auto;
  margin: 0 auto 22px;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.loader__label {
  margin-bottom: 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-forest-700);
  letter-spacing: 0.02em;
}

.loader__track {
  position: relative;
  height: 8px;
  border-radius: var(--radius-pill);
  background: rgba(42, 63, 46, 0.12);
  overflow: hidden;
}

.loader__bar {
  position: relative;
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--color-forest-600) 0%, var(--color-sage-400) 55%, var(--color-mint-200) 100%);
  box-shadow: 0 0 16px rgba(79, 112, 79, 0.45);
  transition: width 0.55s var(--ease-out);
  overflow: hidden;
}

.loader__bar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    transparent 0%,
    rgba(255, 255, 255, 0.12) 40%,
    rgba(255, 255, 255, 0.45) 50%,
    rgba(255, 255, 255, 0.12) 60%,
    transparent 100%
  );
  transform: translateX(-120%);
  animation: loader-shimmer 1.8s ease-in-out infinite;
}

.loader__glow {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 230, 195, 0.95) 0%, rgba(79, 112, 79, 0.35) 55%, transparent 72%);
  pointer-events: none;
  transition: left 0.55s var(--ease-out);
}

.loader__percent {
  margin-top: 14px;
  font-size: 11px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(42, 63, 46, 0.62);
}

#loading.is-error .loader__content {
  max-width: 520px;
  width: min(520px, 90vw);
}

#loading.is-error .loader__logo,
#loading.is-error .loader__track,
#loading.is-error .loader__percent {
  display: none;
}

#loading.is-error .loader__label {
  margin-bottom: 0;
  font-size: 14px;
  line-height: 1.6;
  font-weight: 500;
  color: var(--color-forest-800);
}

@keyframes loader-shimmer {
  0% { transform: translateX(-120%); }
  100% { transform: translateX(220%); }
}

.sound-toggle {
  top: 20px;
  right: 20px;
}

.sound-toggle__icon--off {
  display: none;
}

.sound-toggle.is-muted .sound-toggle__icon--on {
  display: none;
}

.sound-toggle.is-muted .sound-toggle__icon--off {
  display: block;
}

.scroll-hint {
  position: fixed;
  bottom: 28px;
  left: 50%;
  z-index: 15;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  transform: translateX(-50%);
  pointer-events: none;
  padding: 14px 22px;
  border-radius: var(--radius-pill);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-soft);
  opacity: 1;
  visibility: visible;
  transition: opacity 0.5s ease, visibility 0.5s ease, transform 0.5s ease;
}

.scroll-hint.is-hidden {
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(10px);
}

.scroll-hint__icon {
  font-size: 22px;
  color: var(--color-sage-300);
  animation: scroll-hint-bob 1.8s ease-in-out infinite;
}

.scroll-hint__label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-cream-muted);
}

@keyframes scroll-hint-bob {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(5px); opacity: 0.65; }
}