style.css

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@800&display=swap');

html {

    box-sizing: border-box ;
    --duration: .45s ;
    --cubic: cubic-bezier(0.4, 0, 0.2, 1) ;
    --color-1: #d5dadd ;
    --color-2: #51d5c2 ;

}

html *,
html *::before,
html *::after {

    box-sizing: inherit ;

}

body {

    margin: 0 ;
    height: 100vh ;
    display: flex ;
    overflow: hidden ;
    align-items: center ;
    justify-content: center ; 
    background-color: #f0f1f1 ;
    font-family: 'Nunito', sans-serif ;

}

.menu {

    margin: 0 ;
    width: 42em ;
    display: flex ;
    height: 10.4em ;
    user-select: none ;
    position: relative ;
    align-items: center ;
    padding: 0 1.9em 2.5em ;
    justify-content: center ;
    background-color: #fefefe ;
    border-radius: 1em 1em 4.5em 4.5em ;
    -webkit-tap-highlight-color: transparent ;

}

@media (max-width: 42.625em) {
  
  .menu {
    
    font-size: .55em ;
    
  }
  
}

.menu::after {

    height: 5% ;
    width: 35% ;
    bottom: 10% ;
    content: " " ;
    position: absolute ;
    border-radius: 1em ;
    background-color: #f2f3f4 ;


}

.menu__item {

    all: unset ;
    flex-grow: 1 ;
    display: flex ;
    cursor: pointer ;
    overflow: hidden ;
    padding-top: 0.5em ;
    position: relative ;
    align-items: center ;
    color: var(--color-1) ;
    justify-content: center ;
    transition: flex-grow var(--duration) var(--cubic) ;
    
}

.menu__icon {
    
    font-size: 1.05em ;
    stroke: currentColor ;
    transition: transform var(--duration) var(--cubic) ;
    
}

.menu__item::before {

    top: 9% ;
    left: 18.4% ;
    width: 1.5em ;
    height: 1.5em ;
    content: " ";
    position: absolute ;
    border-radius: 50% ;
    transform: scale(0) ;
    transform-origin: center ;
    background-color: #fdecef ;
    transition: transform var(--duration) var(--cubic) ;

}

.menu__item::after {

    left: 0;
    bottom: 0 ;
    content: " " ;
    height: 0.25em ;
    position: absolute ;
    border-radius: 2em ;
    transform-origin: left center ;
    background-color: currentColor ;
    width: calc( var(--lineWidth) + 5px ) ;
    transform: translate3d(3em , 0, 0) scaleX(0) ;
    transition: transform calc( var(--duration) + .2s) var(--cubic) ;

}


.menu__text {

    left: 4.15em ;
    font-size: 1.5em ;
    position: absolute ;
    text-transform: capitalize ;
    letter-spacing: .01em ;
    transform: translate3d(0, 109%, 0) ;
    transition: transform calc( var(--duration) / 3.7 ) ;

}

.menu__item.active {
    
    flex-grow: 2.7 ;
    color: var(--color-2) ;
    
}

.menu__item.active .menu__icon {
    
    transform: translate3d(-95% , 0, 0) ;

    
}

.menu__item.active::before {

    transform: scale(1) ;

}

.menu__item.active::after {

    transform: translate3d(6.3em , 0, 0) scaleX(1) ;
    transition: transform var(--duration) var(--cubic) ;

}

.menu__text.active {

    transform: translate3d(0 , 0, 0) ;
    transition: transform calc(var(--duration) / 1.5) ;
}

.icon {

    --duration-icon: 1s ;
    
    fill: none ; 
    width: 2.5em ;
    height: 2.5em ;
    display: block ;
    stroke-width: 15 ;
    stroke-miterlimit: 10 ;
    
}


.active #home-anm {

    animation: home var(--duration-icon) ;
}

@keyframes home {

    25% {

        transform: translate3d(0, -.8em , 0) ;

    }

    50% {

        transform: translate3d(0, .5em , 0) ;

    }


}

#strategy-anm {
    
    transform: scaleX(.85) ;
    transform-origin: center ;

}

.active #strategy-anm {
    
    animation: strategy var(--duration-icon) ;

}

@keyframes strategy {
    
    50% {

        transform: scaleX(1) ;
        
    }
    
    100%{
        
        transform: scaleX(.85) ;

    }

}

.active #strategy-cir1 {

    animation: strategy-cir1 var(--duration-icon);
}

.active #strategy-cir2 {

    animation: strategy-cir2 var(--duration-icon) .1s;
}

.active #strategy-cir3 {

    animation: strategy-cir3 var(--duration-icon) .2s;
}

@keyframes strategy-cir1 {
    
    50% {

        transform: translate3d(-.7em,-0.7em,0);
        
    }
    
    100%{
        
        transform: translate3d(0,0,0);


    }

}

@keyframes strategy-cir2 {
    
    35% {

        transform: translate3d(0,-0.7em,0);
        
    }
    
    100%{
        
        transform: translate3d(0,0,0);


    }

}

@keyframes strategy-cir3 {
    
    35% {

        transform: translate3d(.7em,-0.7em,0);
        
    }
    
    100%{
        
        transform: translate3d(0,0,0);


    }

}


.active #period-anm {

    transform-origin: center 100% ;
    animation: period var(--duration-icon) ;

}

.active #period-cir {

    transform-origin: center ;
    animation: period-cir var(--duration-icon) ;

}

.active #period-line {

    stroke-dasharray: 66 ;
    animation: period-line calc( var(--duration-icon) / 2.5 ) reverse ;

}


@keyframes period {

    35% {

        transform: scaleY(.85) ;

    }

    60% , 70% {

        transform: scaleY(1.2) ;

    }

    100% {
        
        transform: scaleY(1) ;

    }

}

@keyframes period-cir {

    0%{

       opacity: 0 ;

    }

    35% {

        opacity: 1 ;
        transform: translate3d(15%, -55%, 0) ;

    }

    60%{

        opacity: 0 ;
        transform: translate3d(-8%, -50%, 0) ;

    }

}

@keyframes period-line {


    100% {

        stroke-dashoffset: 66 ;

    }

}


.active #security-cir {

    transform-box: fill-box ;
    transform-origin: center ;
    animation: security-cir calc( var(--duration-icon) / 1.5 ) ;

}

@keyframes security-cir {


    0% {

        transform: scale(0) ;
        
    }
    
    100% {
        
        transform: scale(1) ;
        
    }

}

.active #security-strok {

    stroke-dasharray: 96;
    animation: security-strok calc( var(--duration-icon) / 1.2 ) ;

}

@keyframes security-strok {


    0% {

        stroke-dashoffset: 60 ;
        
    }
    
    100% {
        
        stroke-dashoffset: 230 ;
        
    }

}

.active #settings-anm {

    transform-box: fill-box ;
    transform-origin: center ;
    animation: settings-anm calc( var(--duration-icon) / 1.5 ) ;

}

@keyframes settings-anm {


    0% {

        transform: rotate(-60deg);
        
    }
    
    50% {
        
        transform: rotate(60deg);
        
    }

}