body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(42, 159, 216, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(26, 127, 160, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 30%, rgba(10, 79, 110, 0.2) 0%, transparent 50%);
    animation: waveGlow 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes oceanFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes waveGlow {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

.fish-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.fish {
    position: absolute;
    opacity: 0.7;
    animation: swim linear infinite;
}

.fish svg {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

@keyframes swim {
    0% { transform: translateX(-100px); }
    100% { transform: translateX(calc(100vw + 100px)); }
}

@keyframes swimReverse {
    0% { transform: translateX(calc(100vw + 100px)) scaleX(-1); }
    100% { transform: translateX(-100px) scaleX(-1); }
}

.fish.reverse {
    animation: swimReverse linear infinite;
}

@keyframes tailWag {
    0%, 100% { transform: rotate(-5deg); }
    50% { transform: rotate(5deg); }
}

.fish-tail {
    animation: tailWag 1s ease-in-out infinite;
    transform-origin: left center;
}

/* ── PARTÍCULAS DE LUZ SUBAQUÁTICA ──────────────────────────── */
.light-particle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.9) 0%, rgba(77, 208, 225, 0.5) 50%, transparent 100%);
    pointer-events: none;
    animation: lightRise linear infinite;
    box-shadow: 0 0 6px rgba(77, 208, 225, 0.8), 0 0 12px rgba(255, 255, 255, 0.4);
}

@keyframes lightRise {
    0%   { transform: translate(0, 0) scale(0.8);   opacity: 0;   }
    10%  { opacity: 0.8; }
    80%  { opacity: 0.5; }
    100% { transform: translate(var(--drift-x), -100vh) scale(1.3); opacity: 0; }
}