.header-return > .shell { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.public-languages { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
.header-return .public-languages a { justify-content: center; min-width: 36px; padding-inline: 8px; text-decoration: none; border-radius: 4px; }
.header-return .public-languages a[aria-current="page"] { color: var(--cream, #fffdf8); background: var(--forest, #173d32); }
.header-return .public-languages a:hover { color: var(--cream, #fffdf8); background: var(--terracotta, #a54d35); text-decoration: none; }
.public-languages a:focus-visible { outline: 2px solid var(--terracotta, #a54d35); outline-offset: 2px; }
html[lang="zh-Hans"] { font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; }
html[lang="zh-Hans"] h1, html[lang="zh-Hans"] h2, html[lang="zh-Hans"] h3 { font-family: "Noto Serif SC", "Songti SC", "SimSun", serif; }