.otp-digit-box {
    width: 52px;
    height: 60px;
    border-radius: 12px;
    border: 1.5px solid #e2e8f0;
    background-color: #f8fafc;
    font-size: 1.65rem;
    font-weight: 600;
    color: #5b3cc4;
    text-align: center;
    transition: all 0.15s ease-in-out;
    outline: none;
}

.otp-digit-box:focus {
    border-color: #6c47ff;
    background-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(108, 71, 255, 0.15);
}

.otp-digit-box.is-invalid {
    border-color: #e11d48 !important;
    background-color: #fff1f2 !important;
    color: #e11d48 !important;
}

.otp-digit-box.is-invalid:focus {
    border-color: #e11d48 !important;
    box-shadow: 0 0 0 3px rgba(225, 29, 72, 0.15) !important;
}

@media (max-width: 480px) {
    .otp-digit-box {
        width: 42px;
        height: 50px;
        font-size: 1.35rem;
    }
}