.flex,
.flex-row,
.flex-column,
.flex-center-xy,
.flex-center-between,
.flex-top-between {
  display: flex;
}
.flex-row {
  flex-direction: row;
}
.flex-column {
  flex-direction: column;
}
.flex-left {
  justify-content: flex-start;
}
.flex-center,
.flex-center-xy {
  justify-content: center;
}
.flex-right {
  justify-content: flex-end;
}
.flex-space-between,
.flex-center-between,
.flex-top-between {
  justify-content: space-between;
}
.flex-space-around {
  justify-content: space-around;
}
.flex-top,
.flex-top-between {
  align-items: flex-start;
}
.flex-middle,
.flex-center-xy,
.flex-center-between {
  align-items: center;
}
.flex-bottom {
  align-items: flex-end;
}
.flex-stretch {
  align-items: stretch;
}
.flex-nowrap {
  flex-wrap: nowrap;
}
.flex-wrap {
  flex-wrap: wrap;
}
.flex-full {
  flex: 1;
}
.date-picker {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
}
.mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1;
  display: none;
}
.mask.fade-in {
  animation: fadeIn ease 0.3s forwards;
  display: block;
}
.picker-head {
  height: 50px;
  line-height: 50px;
  padding: 0 12px;
  background: #f6f6f6;
  border-radius: 12px 12px 0 0;
}
.picker-container {
  position: relative;
  z-index: 2;
  background: #fff;
  border-radius: 12px 12px 0 0;
  transform: translateY(100%);
  transition: transform 0.3s;
  animation: slideUp ease 0.3s forwards;
}
.picker-container.slide-up {
  transform: translateY(0);
}
.title {
  font-weight: bold;
}
.cancel {
  color: rgba(0,0,0,0.9);
}
.confirm {
  color: #1976d2;
}
.picker-timer {
  padding: 8px 12px;
}
.timer-input {
  border: 1rpx solid #b6b6b6;
  border-radius: 6px;
  padding: 6px 12px;
  text-align: center;
  font-size: 12px;
  color: #999;
}
.timer-input.active {
  color: #1976d2;
  border: 1rpx solid #1976d2;
}
.timer-tips {
  margin: 0 10px;
  font-size: 12px;
  color: #a3a3a3;
}
.picker-view {
  width: 100%;
  height: 280px;
}
.picker-view-column {
  line-height: 44px;
  text-align: center;
  font-size: 14px;
}