.balance{--bg:var(--fond);--surface:var(--fond-carte);--ink:var(--texte);--muted:var(--texte-doux);--line:var(--bordure);--pos:var(--bleu-500);--neg:#cc4308;--sph:#1b5fd1;--sph-ink:#fff;--nsph-ink:#fff;--cab:#f2b705;--cab-top:#ffd75e;--cab-side:#c58d00;--ncab:#f08a5d;--ncab-top:#ffb089;--ncab-side:#bd5a2f;--cube-ink:#14213d;--box:#e7edf7;--note:#e0993a;--note-edge:#a8691a;--note-ink:#2a1800;--note-err:#7d1c00;--primary:var(--bleu-900);--on-primary:var(--blanc);background:var(--bg);color:var(--ink);font-family:var(--police);min-height:100vh;padding:20px max(16px, env(safe-area-inset-right,0px)) 36px max(16px, env(safe-area-inset-left,0px));font-size:16px;line-height:1.45}@media (prefers-color-scheme:dark){.balance{--bg:#0e1626;--surface:#162036;--ink:#e8edf7;--muted:#9aa7c2;--line:#2a3654;--pos:#6ba3ff;--neg:#ff8b52;--sph:#6ba3ff;--sph-ink:#0e1626;--nsph-ink:#0e1626;--cab:#f5c542;--cab-top:#ffe08a;--cab-side:#c9972b;--ncab:#ff9a6c;--ncab-top:#ffbf9c;--ncab-side:#c9693a;--box:#4a5b7d;--note:#8a5410;--note-edge:#c98a2e;--note-ink:#fff1d9;--note-err:#ffd2bd;--primary:#e8edf7;--on-primary:#0e1626;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}.balance *{box-sizing:border-box}.balance .wrap{gap:16px;max-width:980px;margin:0 auto;display:grid}.balance h1{text-wrap:balance;margin:0;font-size:clamp(26px,6vw,34px);font-weight:700;line-height:1.1}.balance .sub{color:var(--muted);margin:6px 0 0}.balance .retour{color:var(--pos);font-weight:600;text-decoration:none}.balance button{color:inherit;font-family:inherit}.balance button:focus-visible,.balance input:focus-visible{outline:3px solid var(--pos);outline-offset:2px}.balance .lbl{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-size:12px;font-weight:700}.balance .builder{background:var(--surface);border:1px solid var(--line);border-radius:14px;gap:10px;padding:14px;display:grid}.balance .eqfield{flex-wrap:wrap;gap:10px;display:flex}.balance #eqIn{border:2px solid var(--ink);background:var(--bg);min-width:0;height:52px;color:var(--ink);border-radius:12px;flex:260px;padding:0 14px;font-family:inherit;font-size:24px;font-weight:700}.balance .keys{gap:8px;display:flex}.balance .keys button{border:1px solid var(--note-edge);height:42px;color:var(--ink);background:var(--surface);cursor:pointer;border-radius:10px;flex:1;font-size:20px;font-weight:700}.balance .keys button:disabled{opacity:.45;cursor:default}.balance .keys.eqk{max-width:420px}.balance .examples{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.balance .chip{border:1px solid var(--line);background:var(--bg);font-family:var(--police-mono);cursor:pointer;border-radius:999px;padding:6px 12px;font-size:14px;font-weight:600}.balance .chip:hover{border-color:var(--ink)}.balance .chip:disabled{opacity:.45;cursor:default}.balance .stage{grid-template-columns:minmax(0,1fr) minmax(290px,330px);align-items:start;gap:16px;display:grid}@media (width<=820px){.balance .stage{grid-template-columns:minmax(0,1fr)}}.balance .scene{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden}.balance #host svg{width:100%;height:auto;display:block}.balance .caption{min-height:5.6em;margin:0;padding:4px 16px 14px;font-size:16.5px}.balance .notebook{background:var(--note);color:var(--note-ink);border:1px solid var(--note-edge);border-radius:14px;gap:12px;min-width:0;padding:14px;display:grid}.balance .notebook h2{margin:0;font-size:18px}.balance .notebook .lbl,.balance .notebook .hint{color:var(--note-ink)}.balance .notebook .hint{opacity:.85}.balance .notebook .msg{color:var(--note-err);font-weight:700}.balance .cols{grid-template-columns:minmax(0,1fr) 104px;display:grid}.balance .cols .lbl:last-child{padding-left:13px}.balance .log{display:grid}.balance .row{grid-template-columns:minmax(0,1fr) 104px;min-height:46px;display:grid}.balance .row .eq{color:var(--note-ink);white-space:nowrap;font-variant-numeric:tabular-nums;opacity:.6;align-items:center;padding-right:8px;font-size:17px;font-weight:700;display:flex}.balance .row.cur .eq{opacity:1;font-size:19px}.balance .row .op{border-left:3px solid var(--note-ink);font-family:var(--police-mono);color:var(--note-ink);align-items:center;min-width:0;padding:4px 0 4px 10px;font-size:17px;font-weight:600;display:flex}.balance #opIn{border:2px solid var(--ink);background:var(--surface);width:100%;min-width:0;height:38px;color:var(--ink);font-family:var(--police-mono);border-radius:8px;padding:0 8px;font-size:17px;font-weight:600}.balance .msg{min-height:1.4em;color:var(--neg);margin:0;font-size:15px}.balance .msg.tall{min-height:3em}.balance .btn{border:1px solid var(--line);background:var(--surface);cursor:pointer;border-radius:12px;height:48px;padding:0 18px;font-size:16px;font-weight:700}.balance .btn.primary{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}.balance .btn:disabled{opacity:.45;cursor:default}.balance .btns{flex-wrap:wrap;gap:8px;display:flex}.balance .btns .primary{flex:140px}.balance .hint{color:var(--muted);margin:0;font-size:14px}.balance .rules{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px}.balance .rules h2{margin:0 0 8px;font-size:18px}.balance .rules ul{gap:6px;margin:0;padding-left:18px;display:grid}.balance .stand{fill:var(--muted)}.balance .rail{fill:var(--line);stroke:var(--ink);stroke-width:1.5px}.balance .beam{fill:var(--ink)}.balance .pivot{fill:var(--cab);stroke:var(--ink);stroke-width:2px}.balance .string{stroke:var(--ink);stroke-width:1.4px;opacity:.7}.balance .hook{fill:var(--ink)}.balance .pan{fill:var(--box);stroke:var(--ink);stroke-width:1.5px;stroke-linejoin:round}.balance .sph{fill:var(--sph);stroke:var(--ink);stroke-width:1.5px}.balance .sph-hi{fill:#fff;opacity:.45}.balance .sph-t{text-anchor:middle;fill:var(--sph-ink);font-weight:800}.balance .cub{fill:var(--cab);stroke:var(--ink);stroke-width:1.5px}.balance .cub-top{fill:var(--cab-top);stroke:var(--ink);stroke-width:1.2px;stroke-linejoin:round}.balance .cub-side{fill:var(--cab-side);stroke:var(--ink);stroke-width:1.2px;stroke-linejoin:round}.balance .cub-t{text-anchor:middle;fill:var(--cube-ink);font-weight:800}.balance g[data-neg="1"]>.sph{fill:var(--neg)}.balance g[data-neg="1"]>.sph-t{fill:var(--nsph-ink)}.balance g[data-neg="1"]>.cub{fill:var(--ncab)}.balance g[data-neg="1"]>.cub-top{fill:var(--ncab-top)}.balance g[data-neg="1"]>.cub-side{fill:var(--ncab-side)}.balance .badge{fill:var(--primary)}.balance .badge-t{text-anchor:middle;fill:var(--on-primary);font-weight:800}.balance .k-paren{fill:none;stroke:var(--ink);stroke-width:3.5px;stroke-linecap:round}.balance .cable{stroke:var(--ink);stroke-width:3px}.balance .trolley{fill:var(--cab);stroke:var(--ink);stroke-width:1.5px}.balance .sheave{fill:var(--ink)}.balance .k-body{fill:var(--cab);stroke:var(--ink);stroke-width:1.5px}.balance .k-band{fill:var(--ink);opacity:.8}.balance .k-jaw{fill:var(--ink);stroke:var(--ink);stroke-width:1px;stroke-linejoin:round}.balance .k-pin{fill:var(--box);stroke:var(--ink);stroke-width:1.2px}