.soundboard-container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sound-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.sound-card.playing {
    border-color: rgba(56, 189, 248, 0.5);
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.1);
}

.sound-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 0 10px rgba(255,255,255,0.2));
}

.sound-card.playing .sound-icon {
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.2)); }
    50% { transform: scale(1.1); filter: drop-shadow(0 0 20px rgba(56, 189, 248, 0.6)); }
    100% { transform: scale(1); filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.2)); }
}

.sound-details {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 2;
}

.sound-details h2 {
    font-size: 1.2rem;
    color: var(--text-main);
    margin: 0;
}

.volume-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    outline: none;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.volume-slider.active-slider {
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.volume-slider:hover {
    opacity: 1;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.toggle-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
    z-index: 2;
}

.sound-card.playing .toggle-btn {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
}

.toggle-btn:hover {
    transform: scale(1.05);
    background: rgba(255,255,255,0.2);
}

.sound-card.playing .toggle-btn:hover {
    background: #6366f1;
}

.visualizer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(transparent 50%, rgba(56, 189, 248, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
    pointer-events: none;
}

.sound-card.playing .visualizer {
    opacity: 1;
}

.master-controls {
    margin-top: 1rem;
}