.audio-trigger {
    width: 42px;
    height: 42px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.03);
    color: #f8fafc;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    font-size: 1rem;
    transition: all 200ms ease;
    position: relative;
}

.audio-trigger i {
    pointer-events: none;
}

.audio-trigger:hover,
.audio-trigger:focus-visible {
    border-color: rgba(0, 220, 130, 0.4);
    color: #00dc82;
    background: rgba(0, 220, 130, 0.08);
}

.audio-trigger:focus-visible {
    outline: 2px solid rgba(0, 220, 130, 0.5);
    outline-offset: 2px;
}

.audio-trigger::after {
    content: '';
    position: absolute;
    inset: -6px;
    border-radius: inherit;
    border: 1px solid transparent;
    opacity: 0;
    transition: opacity 200ms ease;
}

.audio-trigger[data-audio-state='playing'] {
    border-color: rgba(0, 220, 130, 0.7);
    color: #00dc82;
    box-shadow: 0 10px 20px -14px rgba(0, 220, 130, 0.9);
}

.audio-trigger[data-audio-state='playing']::after {
    border-color: rgba(0, 220, 130, 0.3);
    box-shadow: 0 0 25px rgba(0, 220, 130, 0.2);
    opacity: 1;
}

.audio-trigger[data-audio-state='loading'] i {
    animation: audio-spin 1s linear infinite;
}

.audio-trigger[data-audio-state='error'] {
    border-color: rgba(248, 113, 113, 0.6);
    color: #f87171;
}

.audio-trigger--fab {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    z-index: 50;
}

/* Scroll Progress Indicator */
.scroll-indicator {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 60vh;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 40;
    pointer-events: none;
    overflow: hidden;
}

.scroll-indicator__progress {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 0%;
    border-radius: inherit;
    background: linear-gradient(180deg, #00dc82, #0ea5e9);
    box-shadow: 0 0 20px rgba(0, 220, 130, 0.4);
    transition: height 80ms ease-out;
}

@media (max-width: 768px) {
    .scroll-indicator {
        width: 4px;
        right: 12px;
    }
}

@keyframes audio-spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}