/* 底栏壳层：轨道只位移，圆点/胶囊/细线用真实子节点，不用伪元素 */
.ttb--native {
  width: 100%;
  background: transparent;
}
.ttb {
  order: 999;
  width: 100%;
  flex-shrink: 0;
}
.ttb-ph {
  height: calc(60px + env(safe-area-inset-bottom));
  background: transparent;
  pointer-events: none;
}
.ttb-fixed {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 980;
  background: transparent;
}
.ttb-shell {
  display: flex;
  align-items: center;
  height: 56px;
  margin: 0 8px 4px;
  border: 1px solid;
  border-radius: 22px;
  position: relative;
  overflow: visible;
  box-sizing: border-box;
}
.ttb-shell--plain {
  margin: 0;
  border-radius: 0;
  border-left: none;
  border-right: none;
  border-bottom: none;
  overflow: hidden;
}
.ttb-ind,
.ttb-dot {
  position: absolute;
  left: 0;
  width: 33.333%;
  pointer-events: none;
  background: transparent;
  will-change: transform;
  transition-property: transform;
}
.ttb-ind {
  top: 0;
  height: 100%;
  z-index: 0;
}
.ttb-ind--pill {
  top: 6px;
  height: calc(100% - 12px);
  padding: 0 6px;
  box-sizing: border-box;
}
.ttb-ind-core {
  height: 100%;
  border-radius: 999px;
}
.ttb-ind--line .ttb-ind-core {
  position: absolute;
  left: 28%;
  right: 28%;
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
}
.ttb-dot {
  top: 38px;
  height: 6px;
  z-index: 2;
  display: flex;
  justify-content: center;
}
.ttb-dot-core {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.ttb-item {
  flex: 1;
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}
.ttb-pair {
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.ttb-shell--plain .ttb-pair,
.ttb-shell--line .ttb-pair {
  flex-direction: column;
  gap: 3px;
}
.ttb-ico-wrap {
  position: relative;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  transition: opacity var(--ttb-ms, 320ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1)),
    transform var(--ttb-ms, 320ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1));
}
.ttb-ico {
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  transition: opacity var(--ttb-ms, 220ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1));
}
.ttb-ico--on {
  opacity: 0;
}
.ttb-item.is-on .ttb-ico--on {
  opacity: 1;
}
.ttb-item.is-on .ttb-ico--off {
  opacity: 0;
}
.ttb-item.is-stroke-ok .ttb-ico--off,
.ttb-item.is-stroke-ok .ttb-ico--on {
  opacity: 0;
}
.ttb-cv {
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  opacity: 0;
  pointer-events: none;
}
.ttb-cv.is-show {
  opacity: 1;
}
.ttb-txt {
  font-size: 11px;
  line-height: 1;
  white-space: nowrap;
  transition: opacity var(--ttb-ms, 280ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1)),
    transform var(--ttb-ms, 320ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1)),
    max-width var(--ttb-ms, 320ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1)),
    margin var(--ttb-ms, 320ms) var(--ttb-ease, cubic-bezier(0.32, 0.72, 0, 1));
}
.ttb-shell--pill .ttb-txt {
  max-width: 0;
  margin-left: 0;
  opacity: 0;
  overflow: hidden;
  transform: translate3d(8px, 0, 0);
}
.ttb-shell--pill .is-on .ttb-txt {
  max-width: 3em;
  margin-left: 4px;
  opacity: 1;
  transform: translate3d(0, 0, 0);
}
.ttb-shell--dot .ttb-pair {
  width: 100%;
  height: 100%;
}
.ttb-shell--dot .ttb-ico-wrap {
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -14px;
  margin-top: -14px;
}
.ttb-shell--dot .is-on .ttb-ico-wrap {
  opacity: 0;
  transform: translate3d(0, -8px, 0) scale(0.72);
}
.ttb-shell--dot .ttb-txt {
  position: absolute;
  left: 50%;
  top: 14px;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  transform: translate3d(-50%, 10px, 0);
}
.ttb-shell--dot .is-on .ttb-txt {
  opacity: 1;
  transform: translate3d(-50%, 0, 0);
}
.ttb-safe {
  height: env(safe-area-inset-bottom);
  background: transparent;
}