/* Global Reset */
body {
    background-color: #0f172a;
    color: #e2e8f0;
    font-family: system-ui, -apple-system, sans-serif;
}

.hidden { display: none !important; }

/* Visualizer */
.visualizer-canvas { 
    width: 100%; 
    height: 100%; 
    opacity: 0.8;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in { animation: fadeIn 0.3s ease-out forwards; }

.student-badge { animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
@keyframes popIn { from { transform: scale(0.8); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Range Slider Styling */
input[type=range] {
    -webkit-appearance: none; 
    background: transparent; 
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: #a855f7;
    cursor: pointer;
    margin-top: -6px; 
    box-shadow: 0 0 5px rgba(168, 85, 247, 0.5);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: #334155;
    border-radius: 2px;
}

input[type=range]:focus {
    outline: none;
}