html{
  font-size: 10px;
  line-height: 1.6;
}

body{
  font-size: 1.6rem;
  min-height: 100vh;
  min-height: 100dvh;
  min-height: 100svh;
}

header{
  background: linear-gradient(70deg, #223B80, #7db4e6);
  position: sticky;
  top: 0;
  margin-bottom: 10px;
}

footer{
  background: linear-gradient(70deg, #223B80, #7db4e6);
  position: sticky;
  top: 100vh;
  margin-top: 10px;
  text-align: center;
}

footer p{
  font-size: 1.4rem;
  font-weight: bold;
  color: #ffffff;
  padding: 10px;
}

h1{
  color: #ffffff;
  font-size: 3.2rem;
  font-weight: bold;
  padding: 5px 10px;
}

h3{
  font-size: 2.0rem;
  font-weight: bold;
  padding: 5px 10px;
  margin-left:10px;
  border-left: solid 5px #223B80;
}

h4{
  color: #ffffff;
  font-size: 1.8rem;
  font-weight: bold;
  max-width: 600px;
  padding: 5px 15px;
  margin: 10px;
  border-radius: 6px;
  background: linear-gradient(70deg, #223B80, #7db4e6);
}

div.introduce{
  margin: 10px;
}

div.intrduce p{
  font-size: 1.6rem;
}

div.comment{
  border-left: 5px solid #223B80;
  padding: 5px 10px;
  margin-bottom: 10px;
}

div.notice{
  border-left: 5px solid #223B80;
}

div.notice p{
  margin: 5px 10px;
}

button.btn{
  line-height: 1.4;
}

a.btn{
  line-height: 3.0;
}

.btn{
  font-weight: bold;
  padding: 5px 10px;
  margin: 5px 10px;
}

.btn-border {
  border: 1px solid #cccccc;
  border-radius: 6px;
  background: #ffffff;
}

.btn-border:hover {
  color: #ffffff;
  background: linear-gradient(70deg, #223B80, #7db4e6);
  border: 1px solid #ffffff;
}

.btn2{
  width: 94%;
  font-weight: bold;
  padding: 5px 10px;
  margin: 5px 10px;
}

.btn-border2 {
  color: #ffffff;
  border: 1px solid #ffffff;
  border-radius: 6px;
  background: linear-gradient(70deg, #223B80, #7db4e6);
}

.btn-border2:hover {
  color: #ff0000;
  background: #ffffff;
  border: 1px solid #cccccc;
}

div.select-block {
  margin:10px;
  border-left: 5px solid  #223B80;
  font-weight: bold;
}

div.questionzone {
  max-width: 600px;
  margin: 10px;
  padding: 10px;
  border: 2px solid #cccccc;
  border-radius: 6px;
}

div.none {
  display: none;
}

label {
  padding: 10px;
}

option{
  margin: 0px 10px;
}

select {
  font-weight: normal;
  line-height: 1.4;
  padding: 5px 10px;
  border: solid 1px #000000;
  border-radius: 6px;
  margin-left: 10px;
}

p#questionMax{
  margin-bottom: 10px;
  text-align: right;
  border-bottom: solid 1px #cccccc;
}

.label {
  font-size: 1.4rem;
  font-weight: bold;
  border-left: solid 5px #223B80;
  padding-left: 10px;
}

.text {
  margin-left: 20px;
  margin-bottom: 10px;
}

p#answertext{
  font-weight: bold;
  color: #ff0000;
}

img{
  width: 99%;
  margin-bottom: 10px;
}

div.container{
  margin-bottom: 10px;
}

/* 暗記の仕方の説明 */
details {
  max-width: 600px;
  margin: 20px 10px;
  padding: 0.5em 0.5em 0;
}

summary {
  font-weight: bold;
  color: #ffffff;
  background: linear-gradient(70deg, #223B80, #7db4e6);
  border-radius: 6px;
  margin: -0.5em -0.5em 0;
  padding: 5px 10px;
}

details[open] {
  padding: 0.5em;
}

details[open] summary {
  border-bottom: 1px solid #cccccc;
  margin-bottom: 0.5em;
}

details ol{
  counter-reset: item;
  list-style-type: none;
  padding-left: 0;
}

details ol li{
  text-indent: -1.3em;
  padding-left: 1.3em;
  margin-bottom: 5px;
}

details ol li:before {
  counter-increment: item;
  content: counter(item)'.';
  /* 以下は自由に装飾... */
  padding-right: .5em;
  font-weight: bold;
  color: #223B80;
}

details ul{
  list-style-type: none;
  padding-left: 0;
}

details ul li{
  margin-bottom: 5px;
}

details p{
  margin-top: 10px;
  border-top: 2px solid #cccccc;
  padding: 10px 5px;
}

/* 正解・不正解を選択するラジオボタン */
.RadioInput {
  padding: 8px 8px;
  display: flex;
  align-items: center;
  cursor: pointer;
}
.RadioInput:hover {
  background: rgba(0,0,0,0.05);
}
.RadioInput-Input {
  opacity: 0;
  width: 0;
  margin: 0;
}
.RadioInput-Input:focus + .RadioInput-DummyInput {
  border: solid 1px #333333;
  background: #EEEEEE;
}
.RadioInput-Input:checked + .RadioInput-DummyInput {
  border: solid 1px #333333;
}
.RadioInput-Input:checked + .RadioInput-DummyInput::before {
  content: "";
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #333333;
}
.RadioInput-DummyInput {
  position: relative;
  top: 0;
  left: 0;
  display: block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: solid 1px #888;
}
.RadioInput-LabelText {
  margin-left: 12px;
  display: block;
  font-size: 1.4rem;
  font-weight: bold;
}