/* Shared top bar for stand-alone pages (/calculator/, /macro/): back-to-home link + the site language dropdown.
   Colours match the main site header. No inline styles (site CSP: style-src 'self'). */
.sitebar{background:#080c18;border-bottom:1px solid rgba(255,255,255,.08)}
.sitebar-in{max-width:1180px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding-right:20px}
.sitebar a{display:inline-flex;align-items:center;gap:6px;padding:12px 20px;color:#94a3b8;font-size:14px;font-weight:500;text-decoration:none;transition:color .3s ease}
.sitebar a:hover,.sitebar a:focus-visible{color:#f1f5f9}
.lang-select{position:relative}
.lang-select select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding:6px 28px 6px 12px;font-size:13px;font-weight:600;font-family:inherit;border:1px solid rgba(255,255,255,.08);border-radius:6px;background:rgba(255,255,255,.06);color:#f1f5f9;cursor:pointer;min-width:100px;width:auto}
.lang-select::after{content:"";position:absolute;right:12px;top:50%;width:6px;height:6px;border-right:2px solid #94a3b8;border-bottom:2px solid #94a3b8;transform:translateY(-70%) rotate(45deg);pointer-events:none}
.lang-select select option{background:#0d1224;color:#f1f5f9}
html[lang="en"] .sb-zh{display:none}
html:not([lang="en"]) .sb-en{display:none}