body {
    font-size: 1rem;
    font-weight: 600;
}

@media (min-width: 1280px) {
    .header {
        margin-left: calc(280px + 40px);
    }
    .main-content {
        margin-left: calc(280px + 40px);
    }
}

.rounded-l-full {
    border-top-left-radius: 9999px;
    border-bottom-left-radius: 9999px;
}

.resize-none {
    resize: none;
}

.sound-toggle {
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    background-color: #f8f9fa;
    border: 1px solid #ced4da;
}

.sound-on {
    background-color: #28a745;
    color: white;
    border-color: #28a745;
}

.sound-on:hover {
    background-color: #218838;
    border-color: #1e7e34;
}

.sound-off {
    background-color: #dc3545;
    color: white;
    border-color: #dc3545;
}

.sound-off:hover {
    background-color: #c82333;
    border-color: #bd2130;
}