.lang-btn{border:1px solid var(--line);background:var(--surface);height:36px;color:var(--ink);cursor:pointer;border-radius:10px;align-items:center;gap:6px;padding:0 10px;font-weight:800;transition:background .15s,border-color .15s;display:inline-flex}.lang-btn:hover{background:var(--surface-2)}.lang-btn:focus-visible{box-shadow:var(--focus);outline:none}.lang-code{min-width:3.4ch;font-family:var(--mono);letter-spacing:.04em;text-align:left;font-size:13px}.lang-gear{color:var(--ink-3);transition:transform .45s cubic-bezier(.34,1.56,.64,1);display:inline-flex}.lang-btn.switching .lang-gear{color:var(--primary);transform:rotate(180deg)}.lang-btn.switching .lang-code{color:var(--primary)}.lang-scan{z-index:300;pointer-events:none;background:linear-gradient(to bottom, transparent, color-mix(in srgb, var(--primary) 14%, transparent) 88%, var(--primary) 100%);height:140px;box-shadow:0 2px 14px color-mix(in srgb, var(--primary) 60%, transparent);animation:.65s cubic-bezier(.45,0,.55,1) forwards lang-scan;position:fixed;top:0;left:0;right:0}@keyframes lang-scan{0%{transform:translateY(-140px)}85%{opacity:1}to{opacity:0;transform:translateY(100vh)}}@media (prefers-reduced-motion:reduce){.lang-gear{transition:none}}