*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'League Spartan', sans-serif;
}

:root {

    --dk-violet: hsl(268, 75%, 9%);
    --lt-violet: hsl(268, 47%, 21%);
    --lt-violet2: hsl(281, 89%, 26%);
    --vb-violet: hsl(285, 91%, 52%);
    --vb-violet2: hsl(290, 70%, 36%);
  
    --vb-yellow: hsl(52, 100%, 62%);
  
  
    --pl-white: hsl(0, 0%, 100%);
  
    --vb-cyan: hsl(176, 100%, 44%);
    --vb-cyan2: hsl(177, 92%, 70%);
    --dk-text: hsl(198, 20%, 13%);
}

body{
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, rgba(156, 39, 176, 1) 33%, rgba(0, 0, 255, 1) 100%);
}

.container{
    width: 90%;
    max-width: 450px;
}

h1{
    color:var(--pl-white);
    opacity: 0.75;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-align: center;
}


.display-container{
    position: relative;
    background-color: var(--dk-violet);
    border-radius: 1rem;
    border-bottom: 0.35rem solid var(--lt-violet);
    margin: 1rem 0;
    padding-top: 0.35rem;
}


.display{
    width: 100%;
    background-color: transparent;
    padding: 1.15rem 1rem;
    color: var(--vb-yellow);
    font-weight: 600;
    font-size: 1.5rem;
    line-height: 30px;
    letter-spacing: 1px;
    padding-right: 3.25rem;
    border: none;/*removing the border of input field*/
}

.display::placeholder{
    position:absolute;
    top: 50%;
    left:1.5rem;
    line-height: 30px;
    color: var(--vb-yellow);
    opacity: 0.65;
    text-transform: uppercase;
    transform: translateY(-15px);
}

.display-container button{
    position: absolute;
    top:50%;
    right:1.5rem;
    transform: translateY(-16px);
}

.input-container{
    width: 100%;
    background-color: var(--dk-violet);
    border-radius: 1rem;
    padding: 2rem;
    border-bottom: 0.35rem solid var(--lt-violet);
}

.length-container{
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.length-container p:nth-child(1){
    color: var(--pl-white);
    font-size: 1.5rem;
}

.length-container p:nth-child(2){
    color: var(--vb-yellow);
    font-size: 1.5rem;
}

.strength-container{
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.75rem;
    margin-bottom: 2rem;
}

.strength-container p{
    color: var(--pl-white);
    font-size: 1.5rem;
}

.indicator{
    width:1.5rem;
    height:1.5rem;
    border-radius: 50%;
} 

.generateButton {
    width: 100%;
    padding: 1rem 0;
    background-color: var(--vb-violet);
    text-align: center;
    border-radius: 0.75rem;
    border-bottom: 0.35rem solid var(--vb-yellow);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--vb-yellow);
    font-weight: 600;
    font-size: 1.25rem;
}

.check{
    display: flex;
    align-items: center;
    margin: 1rem 0;
    gap:0 1rem;
}

.check input{
    appearance: none;/*Default Browser Style will not be rendered*/
    width:20px;
    height: 20px;
    border: 1px solid var(--vb-cyan);
    cursor: pointer;
    position: relative;
    border-radius: 0.35rem;
}

.check input:checked{
    background-color: var(--vb-cyan);
}

.check input:checked::before{
    content: '✔';
    position: absolute;
    color: var(--dk-text);
    font-size: 1.05rem;
    left: 50%;
    top:-3.5px;
    /* transform: translateX(-50%);
    transform: translateY(40%); In this case only the last transformation is applied so try to write them in same line */
    transform: translateX(-55%) translateY(5%);
}

.check label{
    color: var(--pl-white);
    font-size: 1.25rem;
    letter-spacing: 0.75px;
}

.slider{
    appearance: none;
    width: 100%;
    height: 0.75rem;
    cursor: pointer;
    background-color: var(--lt-violet);
    border-radius: 1rem;
    margin-top: 2rem;
    margin-bottom: 1.5rem;
    background-image: linear-gradient(var(--vb-violet), var(--vb-violet)); 
}

.slider::-webkit-slider-thumb{
    /*to select the thumb of slider*/
    appearance: none;
    position: relative;
    height: 2rem;
    width:2rem;
    border-radius: 50%;
    background-color: var(--vb-yellow);
    cursor: pointer;
    margin-top: -3px;
    box-shadow: 0px 0px 20px 0px rgba(255, 229, 61, 0.50);
    transition: all 100ms ease-in;
}

.slider:focus{/*when selected the border area gets yellow*/
    outline: 3px solid var(--vb-yellow);
}

.slider::-webkit-slider-thumb:hover{
    outline: 2px solid var(--vb-yellow);
    background-color:  var(--dk-violet);
    box-shadow: 0px 0px 25px 5px rgba(255, 229, 61, 0.80);
}

.copyBtn{
    background-color: transparent;
    border: none;
}

.tooltip{
    position: absolute;
    background-color: var(--vb-violet2);
    color: var(--vb-yellow);
    font-size: 1.25rem;
    top: -35px;
    left: -25px;
    padding: 5px 10px;
    border-radius: 1rem;
    opacity: 0;
    transform: scale(0);
    transform-origin: bottom;
    transition: all 250ms ease-in-out;
}

.tooltip.active {
    opacity: 1;
    transform: scale(1);
}

/*.tooltip.active
This means:

An element that has both the class tooltip and the class active.*/

/*For firefox*/
.slider::-moz-range-thumb {
    height: 2rem;
    width: 2rem;
    border-radius: 50%;
    background-color: var(--vb-yellow);
    cursor: pointer;
    box-shadow: 0px 0px 20px 0px rgba(255, 229, 61, 0.50);
    transition: all 100ms ease-in;
}

.slider::-moz-range-thumb:hover {
    outline: 2px solid var(--vb-yellow);
    background-color: var(--dk-violet);
    box-shadow: 0px 0px 25px 5px rgba(255, 229, 61, 0.80);
}