.baichen-history-section {
  background: linear-gradient(140deg, #080808 50%, #23262B 100%);
  background-image: url('https://okki-shop.oss-cn-hangzhou.aliyuncs.com/category/427473/3155/62a3785604ae4af58cbc702e99c5f18f/2992582e-c147-40fd-81c6-189d998ccdf9.jpg');
  color: #fff;
  padding: 60px 0 0 0;
  min-height: 500px;
  position: relative;
  overflow: hidden;
}
.baichen-history-title {
  /* text-align: center; */
  margin-bottom: 40px;
  /* padding: 0 120px; */
}

.baichen-history-subtitle {
  margin-top: 18px;
  font-size: 20px;
  color: var(--text-color);
  font-weight: 400;
  letter-spacing: 1px;
}
.baichen-history-timeline {
  position: relative;
  width: 100%;
  margin: 0 auto;
  height: 400px;
}
.baichen-history-curve {
  position: absolute;
  left: 0; 
  top: 0;
  width: 100%;
  height: 340px;
  z-index: 1;
  pointer-events: none;
}
.baichen-history-points {
  position: absolute;
  left: 0; 
  top: 0;
  width: 100%;
  height: 180px;
  z-index: 2;
}
.baichen-history-point {
  position: absolute;
  transform: translateX(-50%) translateY(-50%);
  text-align: center;
  color: #fff;
  transition: color 0.3s;
}
.baichen-history-point .baichen-history-date {
  font-size: 14px;
  margin-bottom: 8px;
  color: #fff;
  opacity: 0.5;
  /* transform: translateY(-45px); */
}
.baichen-history-point .baichen-history-name,
.baichen-history-point .baichen-history-location {
  font-size: 16px;
  font-weight: 400;
  color: #fff;
  opacity: 0.5;
}
.baichen-history-point .baichen-history-name {
  transform: translateY(25px);
}
.baichen-history-point .baichen-history-location {
  transform: translateY(24px);
}
.baichen-history-point::before {
  content: '';
  display: block;
  margin: 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: 4px solid rgba(255, 255, 255, 0.23);
  transition: border-color 0.3s, box-shadow 0.3s;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
}
.baichen-history-point.active::before {
  background: #fff;
}

/* 光圈效果 */
.baichen-history-point::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: all 0.3s ease;
}

/* spark 呼吸动画 */
.baichen-history-point.spark::after {
  animation: breathe 2s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% {
    width: 28px;
    height: 28px;
    opacity: 0.6;
  }
  50% {
    width: 40px;
    height: 40px;
    opacity: 0.3;
  }
}

.baichen-history-point.active::before {
  border-color: #fff;
  opacity: 1;
}
.baichen-history-point.active .baichen-history-location,
.baichen-history-point.active .baichen-history-date,
.baichen-history-point.active .baichen-history-name {
  opacity: 1;
}
@media (max-width: 768px) {
  .baichen-history-point .baichen-history-name, .baichen-history-point .baichen-history-location {
    font-size: 14px;
  }
  .baichen-history-curve,
  .baichen-history-timeline {
    height: 600px;
  }
}

@media (max-width: 576px) {
  .baichen-history-point .baichen-history-name, .baichen-history-point .baichen-history-location {
    font-size: 12px;
  }
  .baichen-history-curve,
  .baichen-history-timeline {
    height: 700px;
  }
}