:root {
    --countdown-font-size: 1.8rem;
}

.countdown-numbers {
    display: grid;
    gap: var(--container-gutter);
    grid-template-columns: repeat(auto-fit, minmax(25px, 1fr));
    margin: 2em 0;
}

@media screen and (min-width: 38.5em) { /* 600px */
    .countdown-numbers {
        gap: 1em;
    }
}

.countdown-increment {
    text-align: center;
}

.countdown-increment__value {
    display: block;
    line-height: 1;
    font-size: calc(var(--countdown-font-size) * 1.1);
}

@media screen and (min-width: 48em) { /* 768px */
    .countdown-increment__value {
        font-size: calc(var(--countdown-font-size) * 2);
    }
}

@media screen and (min-width: 75em) { /* 1200px */
    .countdown-increment__value {
        font-size: calc(var(--countdown-font-size) * 3);
    }
}

.countdown-increment__unit  {
    display: block;
    text-transform: uppercase;
    line-height: 1;
    margin-top: 0.5em;
    font-size: calc(var(--countdown-font-size) * 0.6);
}

@media screen and (min-width: 48em) { /* 768px */
    .countdown-increment__unit  {
        font-size: calc(var(--countdown-font-size) * 0.9);
    }
}

.countdown-increment__unit:last-child {
    margin-right: 0;
}