:root{--bg:#f6f6f3;--text:#1c1d1f;--muted:#5d6166;--line:#e2e2dd;--accent:#0f766e;--on-accent:#fff;color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{--bg:#121314;--text:#e7e7e4;--muted:#a2a5aa;--line:#2d2f33;--accent:#4fd1c5;--on-accent:#06231f}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg);color:var(--text);font:16px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding:24px 16px}
main{width:100%;max-width:420px}
.opt{display:flex;align-items:center;gap:14px;width:100%;margin:0 0 14px;padding:18px 20px;border:0;border-radius:14px;background:var(--accent);color:var(--on-accent);font:inherit;font-size:1.1rem;text-align:left;cursor:pointer}
.opt:disabled{opacity:.6;cursor:wait}
.flag{font-size:1.9rem;line-height:1}
.fail{display:none;text-align:center}
.fail button{padding:10px 16px;border-radius:10px;border:1px solid var(--line);background:transparent;color:var(--text);font:inherit;cursor:pointer}
body.is-fail .opts,body.is-fail .topics{display:none !important}
body.is-fail .fail{display:block}
.topics{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.topic{display:flex;flex-direction:column;align-items:center;gap:10px;padding:22px 12px;border:2px solid var(--accent);border-radius:16px;background:transparent;color:var(--text);font:inherit;font-size:1rem;cursor:pointer;text-align:center}
.topic .pic{width:72px;height:72px;color:var(--accent)}
.topic .pic svg{width:100%;height:100%}
.opts{display:none}
.back{display:block;margin:4px auto 0;padding:8px 14px;border:0;background:transparent;color:var(--muted);font:inherit;cursor:pointer}
body.is-step2 .topics{display:none}
body.show-games .opts[data-for=games],body.show-ai .opts[data-for=ai],body.only-games .opts[data-for=games],body.only-ai .opts[data-for=ai]{display:block}
body.only-games .back,body.only-ai .back{display:none}
footer{margin-top:28px;font-size:.8rem;color:var(--muted)}
footer p{margin:4px 0}
footer a{color:var(--muted)}
.test{position:fixed;top:0;left:0;right:0;background:#b45309;color:#fff;text-align:center;font-size:.8rem;padding:4px}