:root {
  --primary-color: #fff;
  --button-color: #000;
  --secondary-color: #f5f5f5;
  --disabled-color: #ccc;
  --warning-color: #ff0000;
}

body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: var(--secondary-color);
}

.timer {
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

.timer__header {
  width: 100%;
  height: 10vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--primary-color);
}

.timer__header h1 {
  color: var(--button-color);
}

.timer__body {
  width: 100%;
  height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.timer__body__time {
  font-size: 5rem;
}

.timer__body__buttons {
  margin-top: 2rem;
}

.timer__body__buttons__button {
  padding: 1rem 2rem;
  margin: 0 1rem;
  font-size: 1.5rem;
  background-color: var(--button-color);
  color: var(--primary-color);
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.warning {
  margin-top: 2rem;
  text-align: center;
  color: var(--warning-color);
}

.warning p {
  color: var(--warning-color);
}

.timer__footer {
  width: 100%;
  height: 10vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--primary-color);
}

.timer__footer p {
  color: var(--button-color);
}

.timer__footer a {
  color: var(--button-color);
  text-decoration: underline;
}

.timer__footer a:hover {
  text-decoration: underline;
}

.timer__body__buttons__button:disabled {
  background-color: var(--disabled-color);
  cursor: not-allowed;
}

.timer__body__buttons__button:disabled:hover {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:active {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:focus {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:visited {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:active:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:active:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:hover:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:hover:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:focus:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:focus:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:visited:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:visited:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:hover {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:active {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:focus {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:visited {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:link {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:after {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:active:before {
  background-color: var(--disabled-color);
}

.timer__body__buttons__button:disabled:link:active:after {
  background-color: var(--disabled-color);
}

@media screen and (max-width: 768px) {
  .timer__body__time {
    font-size: 3rem;
  }

  .timer__body__buttons__button {
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    font-size: 1rem;
  }

  .timer__footer p {
    font-size: 0.8rem;
  }

  .timer__footer a {
    font-size: 0.8rem;
  }

  .timer__footer a:hover {
    font-size: 0.8rem;
  }

  .timer__header h1 {
    font-size: 1.5rem;
  }
}