.portal-header {
  height: 57px;
  padding: 0;
  background: linear-gradient(to right, #00be16, #03c71a, #04c11a, #02c719, #03b918, #04c31a, #00be16);
}

.logo-slot {
  position: relative;
  display: grid;
  height: 55px;
  place-items: center;
  overflow: hidden;
  flex: 0 0 auto;
}

.logo-slot img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* 保持原图比例，禁止手机端把 Logo 强制压扁。 */
  object-fit: contain;
}

.logo-slot span {
  color: #ecffed;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  opacity: .7;
}

.logo-left { width: 208px; }
.logo-left img { object-position: left center; }
.logo-right { width: 95px; }
.logo-right img { object-position: right center; }

@media (max-width: 600px) {
  .portal-header { height: 57px; padding: 0; }
  .logo-left { width: min(208px, calc(100vw - 102px)); }
}