.language-menu { position: relative; flex: 0 0 auto; padding: 0; margin: 0; background: transparent; }
.language-menu summary { display: flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 8px 10px; border: 1px solid var(--line, #dbe0d9); border-radius: 6px; background: var(--canvas, #fafbf7); color: var(--ink, #192521); font-size: 13px; line-height: 1.4; list-style: none; cursor: pointer; white-space: nowrap; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-menu summary:hover { border-color: var(--blue, #2459df); }
.language-links { position: absolute; z-index: 50; right: 0; top: calc(100% + 8px); min-width: 154px; padding: 6px; border: 1px solid var(--line, #dbe0d9); border-radius: 8px; background: #fff; box-shadow: 0 8px 20px #19252112; }
.language-links a { display: block; padding: 12px; font-size: 14px; line-height: 1.4; text-decoration: none; color: var(--ink, #192521); border-radius: 4px; }
.language-links a:hover { background: var(--soft, #f1f3ed); }
.language-links a[aria-current="page"] { background: #edf2ff; color: var(--blue-dark, #1944b8); font-weight: 700; }
.document-nav { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 24px; }
.document-nav>a { font-weight: 650; text-decoration: none; }
html:lang(zh) body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "PingFang TC", "Microsoft YaHei", sans-serif; }
html:lang(zh) h1,html:lang(zh) h2,html:lang(zh) h3 { letter-spacing: 0; line-height: 1.3; }
html:lang(zh) .eyebrow,html:lang(zh) .tag,html:lang(zh) .feature-number { letter-spacing: .06em; }
html:lang(zh) .paper-note strong { font-size: 26px; line-height: 1.45; letter-spacing: 0; }
@media (max-width: 1100px) {
  .nav .desktop-links { display: none; }
  .nav .mobile-menu { display: block; }
}
@media (max-width: 600px) {
  .nav { gap: 8px; padding-left: 16px; padding-right: 16px; }
  .nav .brand { font-size: 20px; gap: 7px; }
  .nav .brand img { width: 30px; height: 30px; }
  .nav-actions { gap: 4px; }
  .nav-actions>.button { display: none; }
  .language-menu summary { font-size: 12px; padding: 8px; }
  html:lang(zh) .hero h1 { font-size: clamp(36px, 8vw, 48px); }
}
@media print { .language-menu,.document-nav { display: none !important; } }