.sino-mobile-nav,
.sino-mobile-nav-spacer {
  display: none;
}

@media (max-width: 820px) {
  .sino-mobile-nav-spacer {
    display: block;
    height: calc(74px + env(safe-area-inset-bottom, 0px));
  }

  .sino-mobile-nav {
    display: block;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    padding: 0 10px calc(8px + env(safe-area-inset-bottom, 0px));
    pointer-events: none;
  }

  .sino-mobile-nav__inner {
    pointer-events: auto;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    max-width: 680px;
    margin: 0 auto;
    padding: 8px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.10);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .sino-mobile-nav__item {
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    min-height: 58px;
    padding: 8px 4px;
    color: #6b7280;
    text-decoration: none;
    border-radius: 14px;
    transition: background .18s ease, color .18s ease, transform .18s ease;
  }

  .sino-mobile-nav__item:active {
    transform: scale(0.98);
  }

  .sino-mobile-nav__item svg {
    width: 21px;
    height: 21px;
    display: block;
    fill: currentColor;
  }

  .sino-mobile-nav__label {
    font-size: 11px;
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
  }

  .sino-mobile-nav__item.is-active {
    color: #111827;
    background: #f3f4f6;
  }
}

@media (min-width: 821px) {
  .sino-mobile-nav,
  .sino-mobile-nav-spacer {
    display: none !important;
  }
}