.portfolio-return {
  position: fixed;
  top: 18px;
  right: 20px;
  z-index: 9999;
  display: inline-flex;
  gap: 8px;
  align-items: center;
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.84);
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.2);
  color: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.portfolio-return::before {
  color: #60a5fa;
  content: "←";
  font-size: 17px;
}

.portfolio-return:hover,
.portfolio-return:focus-visible {
  border-color: rgba(96, 165, 250, 0.7);
  background: rgba(15, 23, 42, 0.96);
  outline: none;
}