.menu-wrapper {
  position: fixed;
  inset: auto 24px 24px auto; /* top right bottom left */
  z-index: 1400;
  color: #f5f5f5;
  isolation: isolate; /* 切断混合上下文，避免背景混色 */
}

.menu {
  padding: 0.5rem;
  background-color: rgba(17, 17, 17, 0.82);
  position: relative;
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  border-radius: 16px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.menu .link {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 70px;
  height: 50px;
  border-radius: 12px;
  position: relative;
  z-index: 1;
  overflow: hidden;
  transform-origin: center left;
  transition: width 0.22s ease-in, background-color 0.22s ease-in, box-shadow 0.22s ease-in;
  text-decoration: none;
  color: inherit;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.menu .link::before {
  position: absolute;
  z-index: -1;
  content: "";
  display: block;
  border-radius: 12px;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transform: translateX(100%);
  transition: transform 0.22s ease-in;
  transform-origin: center right;
  background: linear-gradient(135deg, rgba(255, 127, 80, 0.28), rgba(255, 99, 71, 0.65));
}

.menu .link-icon {
  width: 28px;
  height: 28px;
  display: block;
  flex-shrink: 0;
  left: 18px;
  position: absolute;
  color: inherit;
}

.menu .link-icon svg {
  width: 28px;
  height: 28px;
  display: block;
}

.menu .link-icon svg * {
  stroke: currentColor;
  fill: none;
}

.menu .link-icon svg path[fill]:not([fill="none"]),
.menu .link-icon svg circle[fill]:not([fill="none"]) {
  fill: currentColor;
}

.menu .link-title {
  transform: translateX(100%);
  transition: transform 0.22s ease-in, opacity 0.22s ease-in;
  transform-origin: center right;
  display: block;
  text-align: center;
  text-indent: 28px;
  width: 100%;
  opacity: 0;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.menu .link:hover,
.menu .link:focus-visible {
  outline: 0;
  width: 130px;
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22), 0 8px 18px rgba(0, 0, 0, 0.35);
}

.menu .link:hover::before,
.menu .link:focus-visible::before,
.menu .link:hover .link-title,
.menu .link:focus-visible .link-title {
  transform: translateX(0);
  opacity: 1;
}

@media (max-width: 640px) {
  .menu-wrapper {
    inset: auto 16px 16px auto;
  }

  .menu {
    padding: 0.25rem;
    gap: 0.18rem;
  }

  .menu .link {
    width: 48px;
    height: 40px;
  }

  .menu .link:hover,
  .menu .link:focus-visible {
    width: 96px;
  }

  .menu .link-icon {
    left: 12px;
    width: 20px;
    height: 20px;
  }

  .menu .link-icon svg {
    width: 20px;
    height: 20px;
  }

  .menu .link-title {
    text-indent: 20px;
    font-size: 0.72rem;
  }
}

/* Very small screens: further compact the navigation */
@media (max-width: 400px) {
  .menu-wrapper { inset: auto 10px 10px auto; }
  .menu { padding: 0.18rem; gap: 0.12rem; }
  .menu .link { width: 44px; height: 36px; }
  .menu .link:hover, .menu .link:focus-visible { width: 84px; }
  .menu .link-icon { left: 10px; width: 18px; height: 18px; }
  .menu .link-icon svg { width: 18px; height: 18px; }
  .menu .link-title { text-indent: 18px; font-size: 0.68rem; }
}