.slider-captcha {
  width: 300px;
  max-width: 100%;
  user-select: none;
  -webkit-user-select: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.slider-captcha * { box-sizing: border-box; }
.slider-captcha-panel {
  position: relative;
  width: 100%;
  height: 150px;
  background: #f0f2f5;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid #e5e5e5;
}
.slider-captcha-panel img.sc-bg {
  display: block;
  width: 100%;
  height: 150px;
  object-fit: fill;
}
.slider-captcha-panel img.sc-block {
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 42px;
  pointer-events: none;
  z-index: 2;
  box-shadow: 0 0 4px rgba(0,0,0,.35);
}
.slider-captcha-bar {
  position: relative;
  margin-top: 10px;
  height: 40px;
  background: #f7f9fa;
  border: 1px solid #e4e7eb;
  border-radius: 20px;
}
.slider-captcha-bar-text {
  position: absolute;
  left: 0; right: 0; top: 0; bottom: 0;
  line-height: 40px;
  text-align: center;
  color: #889;
  font-size: 13px;
  pointer-events: none;
}
.slider-captcha-track {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 0;
  background: rgba(82, 196, 26, 0.25);
  border-radius: 20px 0 0 20px;
}
.slider-captcha-btn {
  position: absolute;
  left: 0; top: -1px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid #d9d9d9;
  box-shadow: 0 2px 6px rgba(0,0,0,.12);
  cursor: grab;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #555;
  font-size: 16px;
}
.slider-captcha-btn:active { cursor: grabbing; }
.slider-captcha-btn.ok {
  background: #52c41a;
  border-color: #52c41a;
  color: #fff;
}
.slider-captcha-btn.fail {
  background: #ff4d4f;
  border-color: #ff4d4f;
  color: #fff;
}
.slider-captcha-refresh {
  margin-top: 8px;
  font-size: 12px;
  color: #1890ff;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}
.slider-captcha-msg {
  margin-top: 6px;
  font-size: 12px;
  min-height: 16px;
  color: #888;
}
.slider-captcha-msg.err { color: #ff4d4f; }
.slider-captcha-msg.ok { color: #52c41a; }