*{box-sizing:border-box}
:root{--ink:#0f172a;--muted:#64748b;--card:#fff;--accent:#22c55e;--ring:rgba(34,197,94,.35)}
html,body{margin:0;padding:0;background:transparent;color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial}
.wrap{max-width:980px;margin:0 auto;padding:16px}
.card{background:var(--card);padding:16px; margin-bottom:14px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.row.between{justify-content:space-between}
.btn{border:1px solid var(--accent);background:var(--accent);color:#fff;border-radius:12px;padding:10px 14px;cursor:pointer;font-weight:600}
.btn.ghost{background:#fff;color:var(--accent)}
.btn:focus{outline:none;box-shadow:0 0 0 4px var(--ring)}
.hidden{display:none}
.title-row{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.how-title{font-size:2.1rem;line-height:1;cursor:pointer}
.speaker{height:32px;width:32px;object-fit:contain;cursor:pointer}
.how-list{font-size:1.35rem;line-height:1.5;margin:0 0 12px 22px}
.progress{flex:1;min-width:180px;height:12px;background:#f1f5f9;border-radius:999px;overflow:hidden;border:1px solid #e5e7eb}
.bar{height:100%;width:0;background:linear-gradient(90deg,#86efac,#22c55e)}
.stats{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.divider{color:#cbd5e1}
.cards{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;margin-top:16px}
.numcard{background:#fff;border:2px solid #e5e7eb;border-radius:16px;padding:24px;text-align:center;font-size:2.8rem;font-weight:800;min-height:96px;display:grid;place-items:center}
.symbol-choices{display:grid;grid-template-columns:1fr;gap:8px}
.sym{border:2px solid #e5e7eb;background:#fff;border-radius:12px;padding:14px 18px;font-size:1.6rem;cursor:pointer}
.sym:focus{outline:none;box-shadow:0 0 0 4px var(--ring)}
.sym.active{border-color:#a7f3d0;box-shadow:0 0 0 4px var(--ring)}
/* Scenes */
.scene{position:fixed;inset:0;display:none;place-items:center;background:transparent;z-index:9999}
.scene.show{display:grid}
.scene-card{background:#fff;border:2px solid #e5e7eb;border-radius:18px;padding:28px 22px;max-width:560px;text-align:center;box-shadow:0 10px 30px rgba(0,0,0,.08)}
.scene-card.good{border-color:#bbf7d0;background:#f0fdf4}
.scene-card.bad{border-color:#fecaca;background:#fef2f2}
.scene-title{font-size:1.6rem;font-weight:800;margin-bottom:6px}
.scene-sub{color:#475569}
@media (max-width:700px){
  .cards{grid-template-columns:1fr;gap:10px}
  .symbol-choices{grid-template-columns:repeat(3,1fr)}
  .numcard{font-size:2.2rem;padding:18px}
}