:root{color-scheme:dark;font-family:Inter,system-ui,sans-serif;background:#0b1020;color:#f5f7ff}body{margin:0}.layout{max-width:880px;margin:0 auto;padding:24px;display:grid;gap:16px}.card{background:#151d33;border:1px solid #2a3558;border-radius:12px;padding:16px}.hidden{display:none}label{display:grid;gap:6px;margin-bottom:12px}input,select,button{font:inherit}button{background:#4f7cff;color:#fff;border:0;border-radius:8px;padding:10px 14px;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}.muted{color:#9aa7cc}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;word-break:break-all}pre{white-space:pre-wrap;background:#0d1326;padding:12px;border-radius:8px}video{width:100%;max-height:360px;background:#000}dl{display:grid;grid-template-columns:160px 1fr;gap:8px}