.ac-countdown {
    border: 1px solid #d7d7d7;
    padding: 24px;
    background: #ffffff;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #111111;
}

.ac-countdown__top {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.ac-countdown__timer {
    display: grid;
    grid-template-columns: repeat(4, minmax(70px, 1fr));
    gap: 12px;
    align-items: flex-start;
}

.ac-countdown__unit {
    text-align: center;
}

.ac-countdown__tiles {
    display: flex;
    justify-content: center;
    gap: 4px;
    background: #1f1f1f;
    padding: 12px 10px;
    border-radius: 4px;
    box-shadow: inset 0 -3px 0 rgba(255, 255, 255, 0.12);
    perspective: 600px;
    position: relative;
}

.ac-countdown__digit {
    display: inline-block;
    min-width: 20px;
    padding: 6px 4px;
    background: linear-gradient(180deg, #3b3b3b 0%, #101010 100%);
    color: #ffffff;
    font-size: 24px;
    font-weight: 700;
    font-family: "Courier New", Courier, monospace;
    border-radius: 4px;
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.5);
    transform-origin: center;
    transform-style: preserve-3d;
}

.ac-countdown__digit--flip {
    animation: ac-countdown-flip 0.6s ease;
}

@keyframes ac-countdown-flip {
    0% {
        transform: rotateX(0deg);
        opacity: 1;
    }
    40% {
        transform: rotateX(-90deg);
        opacity: 0.6;
    }
    60% {
        transform: rotateX(-90deg);
        opacity: 0.6;
    }
    100% {
        transform: rotateX(0deg);
        opacity: 1;
    }
}

.ac-countdown__unit-label {
    display: block;
    margin-top: 8px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ac-countdown__expired-message {
    margin-top: 16px;
    font-size: 14px;
    font-weight: 600;
    color: #d72212;
}

.ac-countdown__reveal {
    margin-top: 24px;
}

.ac-countdown__sr {
    position: absolute;
    clip: rect(1px, 1px, 1px, 1px);
    width: 1px;
    height: 1px;
    margin: -1px;
    border: 0;
    padding: 0;
    overflow: hidden;
}

@media (min-width: 768px) {
    .ac-countdown__top {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .ac-countdown__timer {
        flex: 0 0 auto;
        max-width: 360px;
    }
}

@media (max-width: 640px) {
    .ac-countdown {
        padding: 16px;
    }

    .ac-countdown__timer {
        grid-template-columns: repeat(2, minmax(70px, 1fr));
    }
}