body.has-banner {
  --banner-height: 40px;
}

.banner {
  width: 100%;
  height: var(--banner-height);
  box-sizing: border-box;
  /* 以博客主色蓝 #007bff 为起点的渐变，兼顾参考图风格 */
  background: linear-gradient(90deg, #007bff 0%, #5b6ee1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  z-index: 9;
}

.banner-slide {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: calc(100% - 2em);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
  border-radius: 0;
  animation: banner-fade-in 0.5s ease;
}

.banner-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

.banner-arrow {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* 覆盖全局 a:hover 的背景与变色规则，条幅内链接保持自身配色 */
.banner a.banner-slide:hover {
  background-color: transparent;
  color: inherit;
  text-decoration: underline;
}

@keyframes banner-fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 首页：头部 40 + 条幅 + 底部 40，主体高度同步缩减 */
body.has-banner .layout-container.home {
  height: calc(100% - 80px - var(--banner-height));
}

/* 详情页：主体高度让出条幅空间 */
body.has-banner .layout-container {
  height: calc(100% - var(--banner-height));
}

/* 详情页右上角固定圆形导航按钮下移，避免压住条幅 */
body.has-banner .nav-container {
  top: var(--banner-height);
}

@media screen and (max-width: 768px) {
  body.has-banner {
    --banner-height: 36px;
  }

  .banner-slide {
    font-size: 13px;
  }

  .banner-arrow {
    width: 14px;
    height: 14px;
  }
}

@media print {
  .banner {
    display: none !important;
  }

  body.has-banner .layout-container,
  body.has-banner .layout-container.home {
    height: auto;
  }
}