/* Bolhas animadas */
.bubbles {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.bubble {
    position: absolute;
    bottom: -100px;
    background: rgba(255, 223, 128, 0.4);
    border-radius: 50%;
    animation: rise 12s infinite ease-in;
}

.bubble:nth-child(1) { left: 10%; width: 40px; height: 40px; animation-duration: 10s; }
.bubble:nth-child(2) { left: 30%; width: 25px; height: 25px; animation-duration: 14s; }
.bubble:nth-child(3) { left: 50%; width: 35px; height: 35px; animation-duration: 12s; }
.bubble:nth-child(4) { left: 70%; width: 20px; height: 20px; animation-duration: 9s; }
.bubble:nth-child(5) { left: 85%; width: 30px; height: 30px; animation-duration: 15s; }

@keyframes rise {
    0% { transform: translateY(0) scale(1); opacity: 0.8; }
    50% { opacity: 0.4; }
    100% { transform: translateY(-120vh) scale(0.5); opacity: 0; }
}