body{
  margin:0;
  background:#f1f3f4;
  font-family:Roboto, Arial, sans-serif;
}

.captcha-container{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
}

.captcha-box{
  width:400px;
  background:#fff;
  border:1px solid #dadce0;
  border-radius:8px;
  padding:20px;
  box-shadow:0 2px 8px rgba(0,0,0,.1);
}

.captcha-box.wide{
  width:500px;
}

.captcha-header{
  margin-bottom:15px;
}

.captcha-title{
  font-size:16px;
  font-weight:500;
  margin-bottom:4px;
}

.captcha-sub{
  font-size:13px;
  color:#5f6368;
}

.captcha-choice{
  display:flex;
  gap:15px;
}

.captcha-option{
  flex:1;
  border:1px solid #dadce0;
  border-radius:6px;
  padding:15px;
  text-align:center;
  text-decoration:none;
  color:#202124;
  transition:.2s;
}

.captcha-option:hover{
  background:#f8f9fa;
}

.emoji{
  font-size:26px;
  margin-bottom:8px;
}

.captcha-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:6px;
  margin-bottom:15px;
}

.captcha-tile{
  border:1px solid #dadce0;
  padding:0;
  cursor:pointer;
  aspect-ratio:1/1;
  background:#eee;
}

.captcha-tile img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.captcha-tile.selected{
  outline:3px solid #1a73e8;
  outline-offset:-3px;
}

.captcha-actions{
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.captcha-back{
  text-decoration:none;
  color:#5f6368;
  font-size:13px;
}

.captcha-confirm{
  background:#1a73e8;
  border:none;
  color:white;
  padding:8px 16px;
  border-radius:4px;
  cursor:pointer;
}

.captcha-confirm:hover{
  background:#1669c1;
}

.captcha-btn-row{
  display:flex;
  gap:10px;
  margin-top:8px;
}

.captcha-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:8px 16px;
  border-radius:4px;
  font-size:14px;
  text-decoration:none;
  cursor:pointer;
  border:1px solid #dadce0;
  transition:.15s;
}

.captcha-btn.primary{
  background:#1a73e8;
  border-color:#1a73e8;
  color:#fff;
}

.captcha-btn.primary:hover{
  background:#1669c1;
}

.captcha-btn.secondary{
  background:#fff;
  color:#202124;
}

.captcha-btn.secondary:hover{
  background:#f1f3f4;
}