/* 玻璃质感导航（Telegram 风格滑动指示器） */
.index_nav {
  padding: 12px 0 4px;
}

.index_nav .max_w1200 .nav-ul.nav-glass {
  position: relative;
  display: flex;
  align-items: stretch;
  padding: 4px;
  margin: 0;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.42);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.58);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.72);
  overflow: hidden;
}

.index_nav .max_w1200 .nav-ul.nav-glass .nav-indicator {
  position: absolute;
  top: 4px;
  left: 4px;
  bottom: 4px;
  z-index: 0;
  border-radius: 12px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.55) 0%,
    rgba(255, 255, 255, 0.38) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.65);
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.72);
  width: calc((100% - 8px) / var(--tab-count, 3));
  transform: translateX(calc(var(--active-index, 0) * 100%));
  transition: transform 0.38s cubic-bezier(0.34, 1.2, 0.64, 1);
  pointer-events: none;
}

.index_nav .max_w1200 .nav-ul.nav-glass .nav-li {
  flex: 1 1 0;
  min-width: 0;
  position: relative;
  z-index: 1;
  float: none;
  padding: 0;
}

.index_nav .max_w1200 .nav-ul.nav-glass .nav-li .nav-item {
  display: block;
  width: 100%;
  line-height: 48px;
  font-size: 16px;
  font-weight: 500;
  color: rgba(51, 51, 51, 0.55);
  text-align: center;
  text-decoration: none !important;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0 8px;
  white-space: nowrap;
  transition: color 0.25s ease;
}

.index_nav .max_w1200 .nav-ul.nav-glass .nav-li.active .nav-item {
  color: #1a1a1a;
  font-weight: 600;
}

/* 兼容旧 ul/li 结构（若仍有引用） */
.index_nav .max_w1200 ul {
  background: rgba(255, 255, 255, 0.75);
}

@media (max-width: 768px) {
  .index_nav {
    padding: 8px 0 2px;
  }

  .index_nav .max_w1200 .nav-ul.nav-glass {
    border-radius: 14px;
    padding: 3px;
  }

  .index_nav .max_w1200 .nav-ul.nav-glass .nav-indicator {
    top: 3px;
    left: 3px;
    bottom: 3px;
    border-radius: 11px;
    width: calc((100% - 6px) / var(--tab-count, 3));
    transform: translateX(calc(var(--active-index, 0) * 100%));
  }

  .index_nav .max_w1200 .nav-ul.nav-glass .nav-li .nav-item {
    line-height: 40px;
    font-size: 13px;
    padding: 0 4px;
  }
}