/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    opacity: 0;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) translateX(-50%);
    }
    40% {
        transform: translateY(-20px) translateX(-50%);
    }
    60% {
        transform: translateY(-10px) translateX(-50%);
    }
}

/* Intersection Observer fade-in utility */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Glow effect for buttons */
.glow-effect {
    position: relative;
}

.glow-effect::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: inherit;
    border-radius: inherit;
    z-index: -1;
    filter: blur(10px);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.glow-effect:hover::before {
    opacity: 0.6;
}

/* Music Button Animation & Styling */
@keyframes spinMusic {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

#music-btn {
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 0 1px transparent;
}

#music-btn:hover {
    color: var(--c-primary);
}

#music-btn i {
    pointer-events: none;
}

#music-btn.playing {
    color: var(--c-primary);
    opacity: 0.8; /* softer color, not too heavy */
}

#music-btn.playing i {
    animation: spinMusic 4s linear infinite;
}