/* RESET STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */

.chart-skills {
    margin: 0 auto;
    padding: 0;
    list-style-type: none;
}

.chart-skills *,
.chart-skills::before {
    box-sizing: border-box;
}


/* CHART-SKILLS STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */

.chart-skills {
    position: relative;
    width: 188px;
    height: 94px;
    overflow: hidden;
}

.chart-skills::before,
.chart-skills::after {
    position: absolute;
}

.chart-skills::before {
    content: '';
    width: inherit;
    height: inherit;
    border: 10px solid rgba(211, 211, 211, .3);
    border-bottom: none;
    border-top-left-radius: 175px;
    border-top-right-radius: 175px;
}

.chart-skills::after {
    content: '3';
    left: 49%;
    bottom: 0;
    transform: translateX(-50%);
    font-size: 35px;
    font-weight: bold;
    color: #2c99f6;
}

.chart-skills li {
    position: absolute;
    top: 100%;
    left: 0;
    width: inherit;
    height: inherit;
    border: 10px solid;
    border-top: none;
    border-bottom-left-radius: 175px;
    border-bottom-right-radius: 175px;
    transform-origin: 50% 0;
    transform-style: preserve-3d;
    backface-visibility: hidden;
    animation-fill-mode: forwards;
    animation-duration: .4s;
    animation-timing-function: linear;
}

.chart-skills li:nth-child(1) {
    z-index: 4;
    border-color: #23d692;
    animation-name: rotate-one;
}

.chart-skills li:nth-child(2) {
    z-index: 3;
    border-color: firebrick;
    animation-name: rotate-two;
    animation-delay: .4s;
}

.chart-skills li:nth-child(3) {
    z-index: 2;
    border-color: steelblue;
    animation-name: rotate-three;
    animation-delay: .8s;
}

.chart-skills li:nth-child(4) {
    z-index: 1;
    border-color: orange;
    animation-name: rotate-four;
    animation-delay: 1.2s;
}

.chart-skills span {
    position: absolute;
    font-size: .85rem;
    backface-visibility: hidden;
    animation: fade-in .4s linear forwards;
}

.chart-skills li:nth-child(1) span {
    top: 5px;
    left: 10px;
    transform: rotate(-21.6deg);
}

.chart-skills li:nth-child(2) span {
    top: 20px;
    left: 10px;
    transform: rotate(-79.2deg);
    animation-delay: .4s;
}

.chart-skills li:nth-child(3) span {
    top: 18px;
    left: 10px;
    transform: rotate(-140.4deg);
    animation-delay: .8s;
}

.chart-skills li:nth-child(4) span {
    top: 10px;
    left: 10px;
    transform: rotate(-180deg);
    animation-delay: 1.2s;
}


/* ANIMATIONS
–––––––––––––––––––––––––––––––––––––––––––––––––– */

@keyframes rotate-1 {
    100% {
        transform: rotate(36deg);
        /**
         * 12% => 21.6deg
         */
    }
}

@keyframes rotate-2 {
    100% {
        transform: rotate(72deg);
    }
}

@keyframes rotate-3 {

    100% {
        transform: rotate(108deg);
    }
}

@keyframes rotate-4 {
    100% {
        transform: rotate(144deg);
    }
}

@keyframes rotate-5 {
    100% {
        transform: rotate(180deg);
    }
}

@keyframes fade-in {
    0%,
    90% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}