@layer demo, countdown;

@layer countdown{
    .countdown {
        width: fit-content;
        display: inline-grid;
        grid-auto-flow: column;
        grid-auto-columns: 1fr;
        gap: 1rem;
    }
    .countdown > .part {
        display: grid;
        gap: 0.5rem;
    }
    .countdown > .part > .number {
        aspect-ratio: 1;
        display: grid;
        place-items: center;
        border-radius: 50%;
        border: 1px solid hsl(0 0% 50% / .5);
        font-size: 1.5rem;
        position: relative
    }
    .countdown > .part.days { --num: 365 }
    .countdown > .part.hours { --num: 24 }
    .countdown > .part:where(.minutes, .seconds) { --num: 60 }
    .countdown > .part > .number::after{
        content: "";
        position: absolute;
        inset: calc(var(--border-size) * -0.5);
        border-radius: inherit;

        --degree: calc(360deg / var(--num) * (var(--num) - var(--value,0)));
        background-image: conic-gradient(var(--accent) var(--degree), transparent calc(var(--degree) + 0.1deg));

        --border-size: 4px;
        --mask-image: radial-gradient(100% 100%, transparent calc(50% - var(--border-size)), black calc(50% - var(--border-size) + 1px));
        -webkit-mask-image: var(--mask-image);
        mask-image: var(--mask-image);
    }
    .countdown > .part > .text {
        text-align: center;
        opacity: 0.75
    }
}
@layer demo {
    * { box-sizing: border-box }
    body {
        background-color: #060D1F;
        color: #FEFEFE;
        font-family: system-ui, sans-serif;
        text-align: center;
    }
    h2 {
        margin-top: 4rem;
    }
}