:root{
  --bg:#0f1720;
  --panel:#0b1220;
  --muted:#9aa6b2;
  --accent:#06b6d4;
  --surface:#071026;
  --lang-bg:#0b1724;
  --code-bg:#02060a;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;color:#e6eef6;background:var(--bg);-webkit-font-smoothing:antialiased}
.container{display:flex;gap:8px;padding:10px;height:100vh}
.langs{display:flex;flex-direction:column;gap:8px;width:84px;align-items:stretch}
.lang-btn{background:linear-gradient(180deg,var(--lang-bg),#04111a);border:1px solid rgba(255,255,255,0.04);color:var(--muted);padding:8px;border-radius:8px;display:flex;flex-direction:column;align-items:center;gap:6px;font-size:12px;cursor:pointer;min-height:64px}
.lang-btn.active{outline:2px solid rgba(6,182,212,0.16);color:#e6f9fb;background:linear-gradient(180deg,#042b30,#022028)}
.lang-abbr{font-weight:700;font-size:14px;color:var(--accent)}
.panel{flex:1;display:flex;flex-direction:column;gap:8px;background:linear-gradient(180deg,var(--surface),#041025);padding:10px;border-radius:10px;border:1px solid rgba(255,255,255,0.03)}
pre{flex:1;margin:0;padding:12px;border-radius:8px;background:linear-gradient(180deg,var(--code-bg),#00111a);overflow:auto;color:#dff7fb;font-size:13px;line-height:1.45}
.controls{display:flex;gap:8px;align-items:center;justify-content:flex-end;padding-top:4px}
button,select{background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--muted);padding:8px 10px;border-radius:8px;cursor:pointer}
button:active{transform:translateY(1px)}
.code-line{white-space:pre}
@media (max-width:520px){
  .container{padding:8px;gap:6px}
  .langs{flex-direction:row;width:auto;overflow:auto;height:72px;align-items:flex-end}
  .lang-btn{min-width:64px;flex:0 0 auto;flex-direction:row;padding:8px 10px}
  .lang-abbr{font-size:12px}
}