:root[data-theme=paper]{--bg:#faf8f3;--bg-2:#f3efe6;--card:#fffdf8;--ink:#1d1d1d;--ink-2:#5a5751;--accent:#b71c1c;--accent-deep:#8e1414;--line:#e2ddd2;--line-strong:#b9b2a4;--ink-3:#6b6a63;--fn-t:#1e6b3a;--fn-pd:#8a6d1a;--fn-d:#b71c1c;--fn-m:#4a5a80;--key-natural:#fffdf8;--key-sharp:#1d1d1d;--key-highlight:var(--accent);--key-hint:#f6c544;--key-correct:#388e3c;--key-wrong:#c62828;--focus-ring:2px solid var(--accent);--shadow-overlay:0 8px 28px rgba(29,29,29,.12);--radius:4px;--font-head:var(--font-source-serif),Georgia,serif;--font-body:var(--font-source-sans),system-ui,sans-serif}[data-surface=theory]{--surface-bg:#edeae3;--surface-card:#f3efe6;--surface-rule:rgba(29,29,29,.12);--surface-rule-strong:rgba(29,29,29,.24);--surface-ink:#1d1d1d;--surface-ink-soft:#52514c;--surface-ink-faint:#6b6a63;background-color:#edeae3}:root[data-theme=night]{--bg:#1c1917;--bg-2:#252220;--card:#2d2926;--ink:#ede8df;--ink-2:#9a9389;--accent:#b71c1c;--accent-deep:#d32f2f;--line:#3d3733;--line-strong:#5a5148;--ink-3:#9a9389;--fn-t:#6bbf88;--fn-pd:#d0ad4a;--fn-d:#ef6a63;--fn-m:#8fa2cc;--key-natural:#ede8df;--key-sharp:#1c1917;--key-highlight:var(--accent);--key-hint:#f6c544;--key-correct:#388e3c;--key-wrong:#c62828;--focus-ring:2px solid var(--accent);--shadow-overlay:0 8px 28px rgba(0,0,0,.45);--radius:4px;--font-head:var(--font-source-serif),Georgia,serif;--font-body:var(--font-source-sans),system-ui,sans-serif}