/* Real Numbers: protected lesson data is rendered into this existing Mathematics shell. */
.rn-lesson{margin:28px 0}.rn-board{display:flex;flex-wrap:wrap;gap:8px}.rn-board span{background:var(--accent-soft);border-radius:999px;padding:7px 11px;font-size:.78rem;font-weight:700}.rn-diagnostic,.rn-interaction,.rn-retrieval{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;margin:22px 0}.rn-diagnostic h3,.rn-interaction h3{margin:8px 0 14px!important;font-size:1.35rem!important}.rn-diagnostic button,.rn-inputs button,.rn-interaction button{border:1px solid var(--accent);border-radius:999px;background:#fff;padding:9px 13px;margin:4px;cursor:pointer}.rn-diagnostic button:hover,.rn-inputs button:hover,.rn-interaction button:hover{background:var(--accent-soft)}.rn-interaction textarea{display:block;width:100%;border:1px solid var(--line);border-radius:10px;padding:10px;margin:7px 0 12px}.rn-interaction [data-reveal]:disabled{opacity:.45;cursor:not-allowed}.rn-tree{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}.rn-tree div{display:grid;gap:9px;text-align:center;padding:15px;background:var(--accent-soft);border-radius:12px}.rn-tree span{border-top:1px solid var(--accent);padding-top:8px}.rn-inputs{display:flex;gap:10px;flex-wrap:wrap;align-items:end}.rn-inputs label{display:grid;gap:5px;font-weight:700}.rn-inputs input{width:90px;border:1px solid var(--line);border-radius:8px;padding:9px}.rn-proof li{margin:10px 0}.rn-proof select{max-width:100%;padding:8px}.good{color:#17613d;font-weight:700}.repair{color:#8a4b1f;font-weight:700}@media(max-width:560px){.rn-tree{grid-template-columns:1fr}.rn-inputs label,.rn-inputs input{width:100%}.rn-inputs{display:grid;grid-template-columns:1fr 1fr}.rn-inputs button{grid-column:1/-1}.rn-diagnostic,.rn-interaction,.rn-retrieval{padding:17px}}
/* Return-visit revision uses the lesson panel, with no speed score or game chrome. */
.rn-revision{margin:26px 0}.rn-revision>h3{margin:10px 0 8px!important;font-size:2rem!important}.revision-controls,.revision-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.revision-controls{background:var(--accent-soft);padding:16px;border-radius:14px}.revision-controls button,.revision-actions button{border:1px solid var(--accent);border-radius:999px;padding:9px 13px;background:#fff;cursor:pointer}.revision-controls output{font-weight:700;margin-left:auto}.revision-step{background:#fff;border:1px solid var(--line);border-radius:16px;padding:21px;margin:18px 0}.revision-step h4{margin:5px 0 12px;font:1.25rem var(--serif)}.revision-step textarea{display:block;width:100%;border:1px solid var(--line);border-radius:10px;padding:10px;margin:7px 0 12px}.revision-step [data-revision-repair],.revision-step [data-revision-solution]{margin-top:13px;padding:13px;border-radius:10px;background:var(--accent-soft)}.revision-record{font-size:.82rem;color:var(--muted)}@media(max-width:560px){.revision-controls,.revision-actions{display:grid;grid-template-columns:1fr}.revision-controls output{margin:0}.revision-controls button,.revision-actions button{width:100%}.rn-revision>h3{font-size:1.65rem!important}}

.mathematics [hidden]{display:none!important}