.tone-btn {
    min-width: 120px;
    font-size: 1.1rem;
    transition: all 0.2s ease;
    border-width: 2px;
}
.tone-btn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.tone-btn small {
    opacity: 0.8;
}
.tone-btn.correct {
    background-color: #198754 !important;
    border-color: #198754 !important;
    color: white !important;
}
.tone-btn.correct i,
.tone-btn.correct small {
    color: white !important;
    opacity: 1;
}
.tone-btn.incorrect {
    background-color: #dc3545 !important;
    border-color: #dc3545 !important;
    color: white !important;
}
.tone-btn.incorrect i,
.tone-btn.incorrect small {
    color: white !important;
    opacity: 1;
}
.tone-btn:disabled {
    opacity: 0.6;
}
.play-btn {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    font-size: 2.5rem;
    transition: all 0.3s ease;
}
.play-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(13, 110, 253, 0.4);
}
.play-btn i {
    color: white !important;
}
.play-btn.playing {
    animation: pulse 1s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}
.progress-bar-animated {
    transition: width 0.5s ease;
}
.score-display {
    font-size: 2.5rem;
    font-weight: bold;
}
.streak-badge {
    animation: bounceIn 0.5s ease;
}
@keyframes bounceIn {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}
.quiz-card {
    min-height: 400px;
}
.tone-visual {
    height: 60px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 2px;
}
.tone-visual .bar {
    width: 8px;
    background: linear-gradient(to top, #0d6efd, #6ea8fe);
    border-radius: 4px 4px 0 0;
    transition: height 0.3s ease;
}
.difficulty-badge {
    font-size: 0.75rem;
}
.tone-example-btn {
    cursor: pointer;
    transition: transform 0.2s ease;
}
.tone-example-btn:hover {
    transform: scale(1.1);
}
.tone-example-btn:active {
    transform: scale(0.95);
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}