@property --p {
    syntax: '<number>';
    inherits: true;
    initial-value: 0;
}

.pie {
    --p: 12;
    --b: 12px;
    --c: darkred;
    --w: 150px;
    width: var(--w);
    aspect-ratio: 1;
    position: relative;
    display: inline-grid;
    margin: 5px;
    place-content: center;
    font-size: 25px;
    font-weight: bold;
    font-family: sans-serif;
}

    .pie:before,
    .pie:after {
        content: "";
        position: absolute;
        border-radius: 50%;
    }

    .pie:before {
        inset: 0;
        background: radial-gradient(farthest-side,var(--c) 98%,#0000) top/var(--b) var(--b) no-repeat, conic-gradient(var(--c) calc(var(--p)*1%),#0000 0);
        -webkit-mask: radial-gradient(farthest-side,#0000 calc(99% - var(--b)),#000 calc(100% - var(--b)));
        mask: radial-gradient(farthest-side,#0000 calc(99% - var(--b)),#000 calc(100% - var(--b)));
        background-color: #cccccc;
    }

    .pie:after {
        inset: calc(50% - var(--b)/2);
        background: var(--c);
        transform: rotate(calc(var(--p)*3.6deg)) translateY(calc(50% - var(--w)/2));
    }

.animate {
    animation: p 1s .5s both;
}

.no-round:before {
    background-size: 0 0,auto;
}

.no-round:after {
    content: none;
}

@keyframes p {
    from {
        --p: 0
    }
}