/* ===== 拼图滑块验证码（状态覆盖在图上） ===== */
.slider-captcha {
  margin: 0.3rem 0;
  user-select: none;
  -webkit-user-select: none;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', sans-serif;
}

.slider-captcha-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.slider-captcha-header .label {
  font-size: 0.72rem;
  color: var(--gray-500, #6b7280);
  font-weight: 500;
}

.slider-captcha-header .refresh-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.7rem;
  color: var(--gray-400, #9ca3af);
  padding: 0 4px;
  border-radius: 4px;
  transition: color 0.2s;
  line-height: 1.5;
}

.slider-captcha-header .refresh-btn:hover {
  color: var(--primary, #4f46e5);
}

/* 拼图容器 */
.puzzle-container {
  position: relative;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  background: #f0f2f5;
  border: 1px solid #e5e7eb;
  transition: border-color 0.3s;
}

.puzzle-bg {
  display: block;
  width: 100%;
  height: auto;
}

/* 可拖动的拼图碎片 */
.puzzle-piece {
  position: absolute;
  cursor: grab;
  z-index: 5;
  touch-action: none;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.puzzle-piece:active {
  cursor: grabbing;
  filter: drop-shadow(0 3px 8px rgba(0,0,0,0.28));
}

.puzzle-piece.dragging {
  filter: drop-shadow(0 4px 12px rgba(37, 99, 235, 0.35));
}

/* 状态文字覆盖在拼图底部 */
.puzzle-hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 4px 10px;
  text-align: center;
  color: rgba(255,255,255,0.75);
  font-size: 0.72rem;
  pointer-events: none;
  z-index: 2;
  background: linear-gradient(transparent, rgba(0,0,0,0.3));
  text-shadow: 0 1px 2px rgba(0,0,0,0.25);
  transition: opacity 0.3s;
}

.puzzle-hint.hint-passed {
  color: #fff;
  font-weight: 600;
  background: linear-gradient(transparent, rgba(34,197,94,0.4));
}

.puzzle-hint.hint-failed {
  color: #fca5a5;
  font-weight: 500;
  background: linear-gradient(transparent, rgba(239,68,68,0.3));
}

/* 通过状态 */
.slider-captcha.passed .puzzle-container {
  border-color: #22c55e;
}

.slider-captcha.passed .puzzle-piece {
  cursor: default;
  pointer-events: none;
  filter: drop-shadow(0 1px 3px rgba(34, 197, 94, 0.3));
}

/* 失败状态 */
.slider-captcha.failed .puzzle-container {
  border-color: #ef4444;
  animation: captchaShake 0.4s ease;
}
@keyframes captchaShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* 加载状态 */
.slider-captcha.loading .puzzle-piece {
  pointer-events: none;
}