body {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  flex: 0 0 auto;
}

main {
  flex: 0 0 auto;
}

.flex {
  display: flex;
  justify-content: center;
  align-items: center;

  input {
    text-align: center;
    font-weight: 600;
  }

  .sign {
    flex: 0 0 68px;
    background-color: green;
    font-size: 1.5rem;
    margin-inline: .25rem;
  }
}

#questions {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-content: flex-start;
  padding: 1rem;
}

#prevQuiz {
  display: flex;
  justify-content: center;
  align-items: center;

  &::before {
    content: '\21E6';
    font-size: 1.5rem;
    margin-inline-end: .5rem;
  }
}

#nextQuiz {
  display: flex;
  justify-content: center;
  align-items: center;

  &::after {
    content: '\21E8';
    font-size: 1.5rem;
    margin-inline-start: .5rem;
  }
}

.quiz {
  margin: .25rem;
  display: flex;
  justify-content: space-around;
  align-items: center;

  &::before {
    content: attr(x-index);
    background-color: var(--pico-primary-background);
    color: var(--pico-primary);
    padding-inline: .3rem;
    border-radius: 50%;
    text-align: center;
    height: 1.5rem;
    width: 1.5rem;
    flex: 0 0 1.5rem;
    font-size: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
  }
  .quiz_content {
    padding-inline-start: .25rem;
  }
  .quiz_answer:empty {
    background-color: yellow;

    &:after {
      content: '\003f';
      display: inline-block;
      width: 1rem;
      color: yellow;
    }
  }

  &.correct::after {
    content: '\2713';
    display: inline-block;
    color: green;
    margin-inline-start: .5rem;
  }

  &:not(.correct):not(:has(.quiz_answer:empty))::after {
    content: '\2717';
    display: inline-block;
    color: red;
    margin-inline-start: .5rem;
  }
}

#timer {
  display: flex;
  align-items: center;
  margin-block-end: .5rem;

  .part {
    margin-inline: .25rem;
  }

  #minutes {
    display: inline-flex;

    &::after {
      content: '分';
      margin-inline-start: .125rem;
    }
  }

  #seconds {
    display: inline-flex;

    &::after {
      content: '秒';
      margin-inline-start: .125rem;
    }
  }
}