.behavior-container {
    border: 1px solid #dee2e6;
    border-radius: 16px;
    padding: 22px;
}

.behavior-checkbox {
    display: inline-flex;
    flex-direction: column-reverse;
    align-items: flex-start;
    cursor: pointer;
    user-select: none;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    color: #333;
    position: relative;
    padding-left: 40px;
}

.behavior-checkbox input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.behavior-checkbox .checkmark {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 30px;
    width: 30px;
    background-color: #eee;
    border-radius: 5px;
    border: 2px solid #ccc;
    transition: background-color 0.3s, border-color 0.3s;
    box-shadow: 0 0 3px rgba(0,0,0,0.1);
}

.behavior-checkbox:hover .checkmark {
    background-color: #f0f0f0;
    border-color: #999;
}

.behavior-checkbox input:checked ~ .checkmark {
    background-color: #4caf50;
    border-color: #4caf50;
    box-shadow: 0 0 10px rgba(76, 175, 80, 0.6);
}

.behavior-checkbox .checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.behavior-checkbox input:checked ~ .checkmark:after {
    display: block;
}

.behavior-checkbox .checkmark:after {
    left: 10px;
    top: 5px;
    width: 8px;
    height: 14px;
    border: solid white;
    border-width: 0 4px 4px 0;
    transform: rotate(45deg);
}