volatile bool led1State = false;
volatile unsigned long btn2PressTime = 0;
volatile unsigned long btn3PressTime = 0;

void setup() {
  pinMode(3, OUTPUT);
  pinMode(13, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(11), button1Pressed, RISING);
  attachInterrupt(digitalPinToInterrupt(12), button2Pressed, RISING);
  attachInterrupt(digitalPinToInterrupt(2), button3Pressed, RISING);
}

void loop() {
  digitalWrite(3, led1State ? HIGH : LOW); // LED1
  if (btn2PressTime > 0 && (millis() - btn2PressTime) > 5000) {
    btn2PressTime = 0;
  }
  if (btn3PressTime > 0 && (millis() - btn3PressTime) > 7500) {
    btn3PressTime = 0;
  }
  digitalWrite(13, (btn2PressTime > 0 || btn3PressTime > 0) ? HIGH : LOW); // LED2
}

void button1Pressed() {
  led1State = !led1State;
  if (!led1State) {
    btn2PressTime = 0;
    btn3PressTime = 0;
  }
}

void button2Pressed() {
  btn2PressTime = millis();
}

void button3Pressed() {
  btn3PressTime = millis();
}