@charset "UTF-8";

/* --------------------------------
  reset
-------------------------------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
ul {
  list-style: none;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  vertical-align: bottom;
}
html {
  font-size: 100%;  /* 100%  16px */
}


/* --------------------------------
  body
-------------------------------- */
body {
  background-color: #fff;
  color: #333;
  font-size: 1.0rem;  /* rem(root em)1.0rem ≒ 16px */
  font-family: sans-serif;
  line-height: 1.8;
}

/* --------------------------------
  header
-------------------------------- */
.header {
  padding: 20px 0;
  background-color: #8be5ec;
  text-align: center;
}
  .header h1 {
    font-size: 1.5rem;
  }
  .header h1::first-line {
    font-size: 1.125rem;
  }
  .btn {
    display: inline-block;
    width: 100%;
    margin-top: 10px;
    border: #fff;
  }
  .btn a {
    padding: 6px 20px;
    border: 2px solid #518f8e;
    color: #518f8e;
    font-weight: 700;
    transition: all .3s;
  }
  .btn a:hover {
    padding: 6px 20px;
    background-color: #fff;
    color: #518f8e;
  }
  
  @media screen and (max-width: 767px) {
    .header h1 {
      white-space: pre-line;
    }
  }



/* ---------------------------------
  main
--------------------------------- */
.container {
  width: min(90%, 960px);
  margin: 0 auto;
  padding: 5rem 0.5rem;
  text-align: center;
  transition: .5s;  /* ボタンには付けない！外側に付ける */
}
  #btn {
    background: #0bd;
    padding: 1rem;
    margin-bottom: 2rem;
    font-size: 1rem;
    color: #fff;
    border-radius: 8px;
    border: 0;
    cursor: pointer;
  }




/* ---------------------------------
  theme
--------------------------------- */
.dark-theme {
  background-color: #000;
  color: #fff;
}

.content{
    text-align: justify;
}

.content li{
    margin: 30px 0;
}

/* --------------------------------
  footer
-------------------------------- */
.footer {
  padding: 10px;
  background-color: #a4ebf0;
  text-align: center;
}