.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid #dce1ed;
  border-radius: 999px;
  background: #f5f7fc;
  white-space: nowrap;
}

.language-switch button {
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #5e6980;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.25;
}

.language-switch button[aria-pressed="true"] {
  background: #fff;
  color: #405ba5;
  box-shadow: 0 1px 5px #405ba522;
}

html[lang="zh-CN"] body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "DM Sans", sans-serif;
}

html[lang="zh-CN"] h1,
html[lang="zh-CN"] h2,
html[lang="zh-CN"] h3 {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Manrope, sans-serif;
  letter-spacing: normal;
}

@media (max-width: 980px) {
  #menu { display: block; }
  .mobile-section {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-left: auto;
    margin-right: 20px;
    font-size: 13px;
    color: #4d5e94;
  }
  .mobile-section::before {
    content: "";
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #5268b9;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 20px 24px;
    background: #fffffff5;
    border-bottom: 1px solid #e8e3ef;
    align-items: flex-start;
    gap: 16px;
  }
  .nav-links.open { display: flex; flex-direction: column; }
}

@media (max-width: 640px) {
  .language-switch button { font-size: 14px; padding: 8px 15px; }
  html[lang="zh-CN"] .hero h1 { font-size: 27px; line-height: 1.4; }
}