/* 언어 선택 버튼 */
.lang-btn {
    padding: 0.75rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 0.5rem;
    background-color: white;
    color: #374151;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
}

.lang-btn:hover {
    border-color: #3b82f6;
    color: #3b82f6;
}

.lang-btn.active {
    border-color: #3b82f6;
    background-color: #3b82f6;
    color: white;
}

/* 슬라이더 스타일 */
.slider {
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    border-radius: 4px;
    background: #e5e7eb;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    transition: background 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
    background: #2563eb;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: none;
}

/* 오디오 플레이어 */
audio {
    border-radius: 0.5rem;
}

/* 버튼 비활성화 */
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 토스트 알림 */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    color: white;
    font-weight: 500;
    z-index: 100;
    animation: toast-in 0.3s ease, toast-out 0.3s ease 2.7s;
}

.toast.success {
    background-color: #10b981;
}

.toast.error {
    background-color: #ef4444;
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(1rem);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@keyframes toast-out {
    from {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    to {
        opacity: 0;
        transform: translateX(-50%) translateY(1rem);
    }
}

/* 반응형 */
@media (max-width: 640px) {
    .lang-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }
}