body {
    background-color: #f8f9fa;
}

.card {
    border: none;
    border-radius: 15px;
}

.card-body {
    padding: 2rem;
}

h1 {
    color: #2c3e50;
    font-weight: 600;
}

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid #dee2e6;
    padding: 0.75rem;
}

.form-control:focus, .form-select:focus {
    border-color: #4CAF50;
    box-shadow: 0 0 0 0.2rem rgba(76, 175, 80, 0.25);
}

.btn-primary {
    background: linear-gradient(45deg, #4CAF50, #8BC34A);
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
}

.form-range {
    height: 8px;
    border-radius: 4px;
}

.form-range::-webkit-slider-thumb {
    background: #4CAF50;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
}

.form-range::-moz-range-thumb {
    background: #4CAF50;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

#audioPlayer {
    border-radius: 8px;
    background-color: #f8f9fa;
    padding: 10px;
}

.alert {
    border-radius: 8px;
    border: none;
}