Timer with Play/Pause/Reset-Button

My project’s goal is a 60 seconds countdown timer made of an Arduino Uno and a 24 NEOPIXEL ring. The animation of the countdown is made of 2 nested loops (see code below).
Also there’s a capacitive touch sensor which should be used to play/pause the countdown (single touch) as well as resetting the timer to 60 seconds (double touch).
I put the reading of the button state into the inner loop of the animation, but since there is a delay(), the frequency of reading the button value is not enogh to grab a double click.
What do I have to do, to make the button fast and responsive?

My code so far:

#include <FastLED.h>

FASTLED_USING_NAMESPACE

// Constants
const int TOUCH_BUTTON_PIN = 2;  // Input pin for touch state
const int LED_PIN = 13;          // Pin number for LED

// Global Variables
int buttonState = 0;             // Variable for reading button

#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif

#define DATA_PIN    6
#define LED_TYPE    WS2812
#define COLOR_ORDER GRB
#define NUM_LEDS    24
CRGB leds[NUM_LEDS];

#define BRIGHTNESS         25
#define FRAMES_PER_SECOND  50

void setup() {
  delay(3000); // 3 second delay for recovery
  // tell FastLED about the LED strip configuration
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  // set master brightness control
  FastLED.setBrightness(BRIGHTNESS);

  // Configure button pin as input
  pinMode(TOUCH_BUTTON_PIN, INPUT);
  // Configure LED pin as output
  pinMode(LED_PIN, OUTPUT);
}

void loop()
{
  for (int slowCircle = 0; slowCircle < NUM_LEDS; slowCircle++) {
    // clear this led for the next time around the loop
    for (int fastCircle = 0; fastCircle < NUM_LEDS; fastCircle++) {

      // *** BUTTON ***
      // Read the state of the capacitive touch board
      buttonState = digitalRead(TOUCH_BUTTON_PIN);
      // If a touch is detected, turn on the LED
      
      if (buttonState == HIGH) {
        Serial.println("H");
        digitalWrite(LED_PIN, HIGH);
      } else {
        digitalWrite(LED_PIN, LOW);
        Serial.println("L");
      }


      leds[fastCircle] = CRGB::Red;
      leds[slowCircle] = CRGB::Blue;
      FastLED.show();
      delay(104);
      leds[slowCircle] = CRGB::Red;
    }
  }
}

Check the BlinkWithoutDelay example

File → Examples → 02.Digital → BlinkWithoutDelay

Delay is a function that just wastes CPU cycles. Try to avoid using it.

Just checked the example you mentioned, thanks!