.ui-checkbox {
    /*--primary-color: linear-gradient(180deg, #4AA3FD 0%, #0066FE 100%);*/
    --primary-color: linear-gradient(90.01deg, #0899FE 0.01%, #8DC5FF 43.41%, #DAEEFF 86.81%);
    --secondary-color: #000;
    --primary-hover-color: #4096ff;
    --checkbox-bg-color: transparent;
    --checkbox-diameter: 20px;
    --checkbox-border-radius: 4px;
    --checkbox-border-color: #4AA3FD;
    --checkbox-border-width: 1px;
    --checkbox-border-style: solid;
    --checkmark-size: 1.2;
}

.ui-checkbox,
.ui-checkbox *,
.ui-checkbox *::before,
.ui-checkbox *::after {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

.ui-checkbox {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: var(--checkbox-diameter);
    height: var(--checkbox-diameter);
    border-radius: var(--checkbox-border-radius);
    background: var(--checkbox-bg-color);
    border: var(--checkbox-border-width) var(--checkbox-border-style) var(--checkbox-border-color);
    -webkit-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
    cursor: pointer;
    position: relative;
}

.ui-checkbox::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    -webkit-box-shadow: 0 0 0 calc(var(--checkbox-diameter) / 2.5) var(--primary-color);
    box-shadow: 0 0 0 calc(var(--checkbox-diameter) / 2.5) var(--primary-color);
    border-radius: inherit;
    opacity: 0;
    -webkit-transition: all 0.5s cubic-bezier(0.12, 0.4, 0.29, 1.46);
    -o-transition: all 0.5s cubic-bezier(0.12, 0.4, 0.29, 1.46);
    transition: all 0.5s cubic-bezier(0.12, 0.4, 0.29, 1.46);
}

.ui-checkbox::before {
    top: 40%;
    left: 50%;
    content: "";
    position: absolute;
    width: 4px;
    height: 7px;
    border-right: 2px solid var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
    -webkit-transform: translate(-50%, -50%) rotate(45deg) scale(0);
    -ms-transform: translate(-50%, -50%) rotate(45deg) scale(0);
    transform: translate(-50%, -50%) rotate(45deg) scale(0);
    opacity: 0;
    -webkit-transition: all 0.1s cubic-bezier(0.71, -0.46, 0.88, 0.6), opacity 0.1s;
    -o-transition: all 0.1s cubic-bezier(0.71, -0.46, 0.88, 0.6), opacity 0.1s;
    transition: all 0.1s cubic-bezier(0.71, -0.46, 0.88, 0.6), opacity 0.1s;
}

.ui-checkbox:hover {
    border-color: var(--primary-color);
    /*background: var(--primary-color);*/
}

.ui-checkbox:checked {
    background: var(--primary-color);
    color: #000;
}

.ui-checkbox:checked::before {
    opacity: 1;
    -webkit-transform: translate(-50%, -50%) rotate(45deg) scale(var(--checkmark-size));
    -ms-transform: translate(-50%, -50%) rotate(45deg) scale(var(--checkmark-size));
    transform: translate(-50%, -50%) rotate(45deg) scale(var(--checkmark-size));
    -webkit-transition: all 0.2s cubic-bezier(0.12, 0.4, 0.29, 1.46) 0.1s;
    -o-transition: all 0.2s cubic-bezier(0.12, 0.4, 0.29, 1.46) 0.1s;
    transition: all 0.2s cubic-bezier(0.12, 0.4, 0.29, 1.46) 0.1s;
}

  .ui-checkbox:active:not(:checked)::after {
    -webkit-transition: none;
    -o-transition: none;
    -webkit-box-shadow: none;
    box-shadow: none;
    transition: none;
    opacity: 1;
}