.qq-overview {
  width: 100%;
  background: #f5f5f7;
  padding: 52px 20px;
  box-sizing: border-box;
}

.qq-overview * {
  box-sizing: border-box;
}

.qq-overview__inner {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: center;
}


/* ================================
   每一项
================================ */

.qq-overview__item {
  position: relative;
  text-align: center;
  padding: 10px 20px;
}


/* PC端分隔线 */
.qq-overview__item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  width: 1px;
  height: 70%;
  background: #d8d8dc;
}


/* ================================
   数字
================================ */

.qq-overview__number {
  position: relative;
  margin-bottom: 12px;
  line-height: 1;
  white-space: nowrap;

  transition:
    transform .35s cubic-bezier(.22,.61,.36,1);
}


/* 蓝色动态短线 */
.qq-overview__number::after {
  content: "";
  position: absolute;

  left: 50%;
  bottom: -10px;

  width: 46px;
  height: 2px;

  background: #0072e7;

  transform:
    translateX(-50%)
    scaleX(0);

  transform-origin: center;

  opacity: 0;

  transition:
    transform .38s cubic-bezier(.22,.61,.36,1),
    opacity .25s ease;
}


.qq-counter {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -1.5px;
  color: #111111;

  transition:
    color .3s ease;
}


.qq-unit {
  margin-left: 3px;
  font-size: 25px;
  font-weight: 700;
  color: #0072e7;

  transition:
    transform .3s ease;
}


/* ================================
   描述
================================ */

.qq-overview__label {
  font-size: 14px;
  line-height: 1.5;
  color: #666666;
  letter-spacing: 0.1px;

  transition:
    color .3s ease,
    transform .35s ease;
}


/* ================================
   PC Hover 动效
================================ */

@media (hover:hover) and (pointer:fine) {

  /* 数字整体轻微上浮 */
  .qq-overview__item:hover .qq-overview__number {
    transform: translateY(-5px);
  }

  /* 主数字变品牌蓝 */
  .qq-overview__item:hover .qq-counter {
    color: #0072e7;
  }

  /* 蓝线从中间展开 */
  .qq-overview__item:hover .qq-overview__number::after {
    transform:
      translateX(-50%)
      scaleX(1);

    opacity: 1;
  }

  /* 描述稍微加深并下移一点 */
  .qq-overview__item:hover .qq-overview__label {
    color: #333333;
    transform: translateY(2px);
  }

}


/* ================================
   Tablet
================================ */

@media (max-width: 900px) {

  .qq-overview {
    padding: 44px 18px;
  }

  .qq-counter {
    font-size: 40px;
  }

  .qq-unit {
    font-size: 22px;
  }

}


/* ================================
   Mobile
================================ */

@media (max-width: 600px) {

  .qq-overview {
    padding: 32px 14px;
  }

  .qq-overview__inner {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 26px;
  }

  .qq-overview__item {
    padding: 8px 10px;
  }

  /* 取消PC竖线 */
  .qq-overview__item:not(:last-child)::after {
    display: none;
  }

  /* 手机中间竖线 */
  .qq-overview__item:nth-child(odd)::after {
    content: "";
    display: block;
    position: absolute;
    right: 0;
    top: 10%;
    width: 1px;
    height: 80%;
    background: #d8d8dc;
  }

  /* 手机上下分隔线 */
  .qq-overview__item:nth-child(1)::before,
  .qq-overview__item:nth-child(2)::before {
    content: "";
    position: absolute;
    left: 10%;
    bottom: -13px;
    width: 80%;
    height: 1px;
    background: #e1e1e5;
  }

  /* 手机不显示hover蓝线 */
  .qq-overview__number::after {
    display: none;
  }

  .qq-counter {
    font-size: 32px;
    letter-spacing: -0.8px;
  }

  .qq-unit {
    font-size: 19px;
  }

  .qq-overview__label {
    max-width: 140px;
    margin: 0 auto;
    font-size: 12px;
    line-height: 1.4;
  }

}


/* ================================
   极小屏幕
================================ */

@media (max-width: 360px) {

  .qq-counter {
    font-size: 28px;
  }

  .qq-unit {
    font-size: 17px;
  }

  .qq-overview__label {
    font-size: 11px;
  }

}