@charset "utf-8";
/* CSS Document */


.base-ban {
  position: relative;
  width: 100%;
}

.banner {
  position: relative;
  width: 100%;
  height: 750px;
  overflow: hidden;
  background: #111;
}

/* 轨道：flex 横排所有 slide，用 transform 位移，性能最好 */
.b-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  transition: transform .8s cubic-bezier(.25, .8, .25, 1);
  will-change: transform;
}

.b-img a {
  display: block;
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  background-size: cover !important;
  background-position: center center !important;
  background-repeat: no-repeat;
}

/* 底部圆点 */
.b-list {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  z-index: 3;
  margin: 0;
  padding: 0;
}

.b-list span {
  display: block;
  width: 14px;
  height: 14px;
  margin: 0 6px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, .7);
  background: transparent;
  cursor: pointer;
  box-sizing: border-box;
  transition: background-color .3s, border-color .3s, transform .3s;
}

.b-list span:hover {
  border-color: #fff;
}

.b-list span.spcss {
  background: #8604ab;
  border-color: #8604ab;
  transform: scale(1.2);
}

/* 左右箭头：纯 CSS 画，不依赖图片 */
.bar-left,
.bar-right {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, .15);
  border-radius: 50%;
  cursor: pointer;
  text-decoration: none;
  transition: background-color .3s;
}

.bar-left { left: 40px; }
.bar-right { right: 40px; }

.bar-left:hover,
.bar-right:hover {
  background: rgba(255, 255, 255, .4);
}

.bar-left em,
.bar-right em {
  display: block;
  width: 12px;
  height: 12px;
  border-top: 2px solid #fff;
  border-right: 2px solid #fff;
}

.bar-left em {
  transform: rotate(-135deg);
  margin-left: 5px;
}

.bar-right em {
  transform: rotate(45deg);
  margin-right: 5px;
}

/* 响应式 */
@media (max-width: 1024px) {
  .banner { height: 600px; }
  .bar-left { left: 20px; }
  .bar-right { right: 20px; }
  .bar-left,
  .bar-right { width: 48px; height: 48px; }
  .b-list { bottom: 30px; }
}

@media (max-width: 767px) {
  .banner {
    height: 60vh;
    min-height: 360px;
  }
  .bar-left { left: 12px; }
  .bar-right { right: 12px; }
  .bar-left,
  .bar-right { width: 40px; height: 40px; }
  .bar-left em,
  .bar-right em { width: 10px; height: 10px; }
  .b-list {
    bottom: 20px;
  }
  .b-list span {
    width: 10px;
    height: 10px;
    margin: 0 4px;
  }
}