/* 総合設定（文字色他) */
*{
  box-sizing: border-box;
  margin:0;
  padding:0;
  color: rgb(72,72,72);
}

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

a {
  text-decoration: none;
}

a:hover{
  text-decoration: normal;
}

/* ビデオタグ内に、高さを等倍比に、横余剰表示部をトリミングする。 */
div.top_video_wrapper video{
  /* 動画フレームを全てカバーする設定 */
  object-fit: cover;
  /* 中心を真ん中に、両端をトリミングする。 */
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
}

div#login_form{
  font-family: Agenda-Light, Agenda Light, Agenda, Arial Narrow, sans-serif;
  font-weight:100;
  background: rgba(0,0,0,0.3);
  color: white;
  padding: 2rem;
  /* width: 33%; */
  width: 90%;
  margin:2rem;
  float: right;
  font-size: 1.2rem;
}

div#login_form p{
  color: #fff;
}

div#login_form h1 {
  font-size: 3rem;
  color: #fff;
  text-transform: uppercase;
  margin-top: 0;
  letter-spacing: .3rem;
}

div.inner_link{
  margin-top: 8px;
  margin-bottom: 8px;
}

/* ビデオの設定 */
div.top_video_wrapper video {
  position: fixed;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: -100;
  transform: translateX(-50%) translateY(-50%);
  background: url('//demosthenes.info/assets/images/polina.jpg') no-repeat;
  background-size: cover;
  transition: 1s opacity;
}

input.form_textbox{
  display: block;
  width: 80%;
  padding: .4rem;
  border: none;
  margin: 1rem auto;
  font-size: 1.3rem;
  background: rgba(255,255,255,0.23);
  color: #fff;
  border-radius: 3px;
  cursor: pointer;
  transition: .3s background;
}

input.form_textbox:hover {
  background: rgba(0,0,0,0.5);
}

input::placeholder {
	color: #fff;
}

div.submit_btn_wrapper{
  width: 100%;
  display: flex;
  justify-content: center;
}

input#login_submit_btn{
  font-size: 1.3em;
  /* width: 100%; */
  width: 295px;
  height: 35px;
  margin: 1rem auto;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,0.23);
  background: rgba(255,255,255,0.23);
  color: #fff;
  cursor: pointer;
}

input#login_submit_btn:hover {
  background: rgba(0,0,0,0.5);
}

#login_form button {
  display: block;
  width: 80%;
  padding: .4rem;
  border: none;
  margin: 1rem auto;
  font-size: 1.2rem;
  background: rgba(255,255,255,0.23);
  color: #fff;
  border-radius: 3px;
  cursor: pointer;
  transition: .3s background;
}

#login_form button:hover {
   background: rgba(0,0,0,0.5);
}

a {
  display: inline-block;
  color: #fff;
  text-decoration: none;
  background:rgba(0,0,0,0.5);
  padding: .5rem;
  transition: .6s background;
}

a:hover{
  background:rgba(0,0,0,0.9);
}

div.form_wrapper{
  margin-top: 12px;
  margin-bottom: 12px;
}

/* タブレットの設定 */
@media (min-width: 744px) {
  div#login_form{
    width: 50%;
  }

  input#login_submit_btn{
    width: 260px;
  }
}

/* パソコンの設定 */
@media (min-width: 1128px) {
  div#login_form{
    width: 33%;
  }

  input#login_submit_btn{
    width: 280px;
  }
}