.app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.8rem;
  padding: 1.8rem 0;
  background-color: lightgray;
}

.app > * {
  width: min(40rem, 95%);
  border: 2px solid darkslategray;
  background-color: white;
  border-radius: 1rem;
  padding: 0.8rem 1rem;
}

.estimator {
  font-family: sans-serif;
  font-size: 1.2rem;
  line-height: 130%;
  padding-block: 1.8rem;
}
.estimator > * + * {
  margin-top: 1.5rem;
}
.estimator__field {
  display: block;
}
.estimator__out {
  display: block;
  text-align: center;
  font-size: 1.3em;
  margin-top: 0.8rem;
}

.textbox {
  /* outline: 1px solid magenta; */
  display: block;
  width: min(15rem, 95%);
  height: 3rem;
  margin-inline: auto;
  border: 1px solid grey;
  border-radius: 0.7rem;
  padding: 0 1rem;
}
.textbox:not(:focus):invalid {
  border: 2px solid red;
}

.timer {
  height: min(15rem, 90vh);
  display: flex;
  flex-direction: column;
}
.timer__display-container {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr min-content 1fr;
  align-items: center;
  text-align: center;
}
.timer__display {
  font-size: xx-large;
  text-align: center;
  grid-row: 1;
  grid-column: 2;
}
.timer__controls {
  display: flex;
  align-items: start;
  justify-content: center;
  height: 30%;
  gap: 2rem;
}
.timer__start {
  width: 4rem;
  height: 4rem;
  border: 1px solid grey;
}
.timer__lap {
  width: 4rem;
  height: 4rem;
  border: 1px solid grey;
}
:disabled {
  color: grey;
}
.warning {
  font-family: sans-serif;
  font-size: 1.4rem;
  grid-column: 3;
  color: red;
  font-weight: bold;
}

@media screen and (max-width: 750px) {
  .timer {
    position: fixed;
    bottom: 1rem;
    height: unset;
    flex-direction: row;
    height: unset;
    width: 98%;
  }
  .timer__display-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }
  .timer__controls {
    gap: .8rem;
  }

  .warning {
    font-size: 1rem;
  }

  .app {
    padding-bottom: 8rem;
  }
}

.timing-data {
  min-height: 5rem;
}

.displaynone {
  display: none;
}

.timing-data ol {
  list-style-type: decimal-leading-zero;
  list-style-position: inside;
  /* two-column list, without layout shift */
  display: grid;
  grid-template-columns: 1fr 1fr;
}