container,
clock,
remaining,
message {
  display: flex;
  flex-flow: column;
  margin: auto;
  height: 100%;
  justify-content: center;
}

h2 {
  text-align: center;
  font-size: 2em;
  padding: 0 1.5em;
}

body {
  font-family: "Open Sans", arial, sans-serif;
}

message {
  font-size: 2em;
}

.centered-message {
  text-align: center;
}

.timer-settings {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.4em;
  margin: 1em auto;
}

.timer-settings label {
  text-align: center;
  font-size: 2em;
  font-weight: bold;
}

.timer-settings input {
  box-sizing: border-box;
  width: 25%;
  justify-self: center;
  min-height: 2.5em;
  padding: 0.4em;
  font: inherit;
  font-size: 2em;
  text-align: center;
}

button {
  margin: 5px;
  padding: 5px;
  font-size: 2em;
  font-weight: 600;
}

clock {
  position: relative;
  border-radius: 4px;
  border: 1px solid #2196F3;
  margin: 5em;
}

.settings-button {
  position: absolute;
  top: 0.25em;
  right: 0.25em;
  margin: 0;
  padding: 0.2em;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: #333;
  font-size: 2em;
  line-height: 1;
  cursor: pointer;
}

.settings-button.active {
  background: #2196F3;
  color: white;
}

@media (max-width: 480px) {
  clock {
    margin: 1em;
  }
}

remaining {
  font-size: clamp(5rem, min(40vw, 35vh), 15rem);
}

#startButton {
  color: #005400;
}

#resetButton {
  color: #a20b00;
}

@media (orientation: landscape) and (max-height: 500px) {
  clock {
    margin: 0.5em 1em;
  }

  h2 {
    margin: 0.4em auto;
    padding: 0 2.5em;
    font-size: 1.25em;
  }

  message,
  .timer-settings label,
  .timer-settings input,
  button {
    font-size: 1.25em;
  }

  .timer-settings {
    gap: 0.2em;
    margin: 0.5em auto;
  }

  .timer-settings input {
    min-height: 2em;
    padding: 0.2em;
  }

  button {
    margin: 2px;
    padding: 0.25em;
  }

  .settings-button {
    font-size: 1.5em;
  }

  remaining {
    font-size: clamp(4rem, min(40vw, 30vh), 8rem);
  }
}

@media (orientation: portrait) and (max-width: 480px) {
  clock {
    margin: 0.75em;
  }

  h2,
  message,
  .timer-settings label,
  .timer-settings input,
  button {
    font-size: 1.8em;
  }

  h2 {
    padding: 0 1.5em;
  }

  .timer-settings {
    gap: 0.35em;
    margin: 0.75em auto;
  }

  .timer-settings input {
    min-height: 2.4em;
  }

  button {
    margin: 4px;
    padding: 0.25em;
  }

  .settings-button {
    font-size: 1.8em;
  }

  remaining {
    font-size: clamp(4.5rem, min(36vw, 32vh), 14rem);
  }
}