:root{--bg:#f8fafc;--bg-elev:#fff;--fg:#0f172a;--fg-muted:#475569;--fg-subtle:#64748b;--border:#e2e8f0;--border-strong:#cbd5e1;--accent:#4338ca;--accent-hover:#3730a3;--focus:#2563eb;--shadow-sm:0 1px 2px #0f172a0f, 0 1px 3px #0f172a0a;--shadow-md:0 4px 12px #0f172a14, 0 2px 4px #0f172a0a;--shadow-lg:0 12px 32px #0f172a1f, 0 4px 8px #0f172a0d;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--tone-emerald-bg:#ecfdf5;--tone-emerald-fg:#047857;--tone-amber-bg:#fffbeb;--tone-amber-fg:#b45309;--tone-grass-bg:#f0fdf4;--tone-grass-fg:#15803d;--tone-sky-bg:#eff6ff;--tone-sky-fg:#1d4ed8;--tone-rose-bg:#fff1f2;--tone-rose-fg:#be123c;--tone-violet-bg:#f5f3ff;--tone-violet-fg:#6d28d9;--tone-indigo-bg:#eef2ff;--tone-indigo-fg:#4338ca;--tone-crimson-bg:#fef2f2;--tone-crimson-fg:#b91c1c;--tone-ochre-bg:#fffbeb;--tone-ochre-fg:#a16207;--tone-rust-bg:#fff7ed;--tone-rust-fg:#c2410c;--tone-teal-bg:#f0fdfa;--tone-teal-fg:#0f766e;--tone-gold-bg:#fefce8;--tone-gold-fg:#ca8a04;--tone-berry-bg:#fff1f5;--tone-berry-fg:#9f1239;--tone-purple-bg:#faf5ff;--tone-purple-fg:#7c3aed;--tone-cyan-bg:#ecfeff;--tone-cyan-fg:#0891b2;--tone-midnight-bg:#eef2ff;--tone-midnight-fg:#1e3a8a;--tone-slate-bg:#f1f5f9;--tone-slate-fg:#475569;--tone-plum-bg:#fdf4ff;--tone-plum-fg:#86198f;--ok-fg:#047857;--ok-bg:#d1fae5;--err-fg:#be123c;--err-bg:#ffe4e6;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;--font-mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}[data-theme=dark]{--bg:#0b1120;--bg-elev:#131b2e;--fg:#e2e8f0;--fg-muted:#94a3b8;--fg-subtle:#64748b;--border:#1e293b;--border-strong:#334155;--accent:#a5b4fc;--accent-hover:#c7d2fe;--shadow-sm:0 1px 2px #0006;--shadow-md:0 4px 12px #0006;--shadow-lg:0 12px 32px #00000080;--tone-emerald-bg:#022c22;--tone-emerald-fg:#6ee7b7;--tone-amber-bg:#2a1a04;--tone-amber-fg:#fcd34d;--tone-grass-bg:#052e16;--tone-grass-fg:#86efac;--tone-sky-bg:#0c1e3c;--tone-sky-fg:#93c5fd;--tone-rose-bg:#2a0a13;--tone-rose-fg:#fda4af;--tone-violet-bg:#1e1b3a;--tone-violet-fg:#c4b5fd;--tone-indigo-bg:#1e1b4b;--tone-indigo-fg:#a5b4fc;--tone-crimson-bg:#2a0a0a;--tone-crimson-fg:#f87171;--tone-ochre-bg:#2a2207;--tone-ochre-fg:#eab308;--tone-rust-bg:#2a1505;--tone-rust-fg:#fb923c;--tone-teal-bg:#042f2e;--tone-teal-fg:#2dd4bf;--tone-gold-bg:#2a2207;--tone-gold-fg:#facc15;--tone-berry-bg:#2a0a13;--tone-berry-fg:#fb7185;--tone-purple-bg:#1a1033;--tone-purple-fg:#a78bfa;--tone-cyan-bg:#083344;--tone-cyan-fg:#22d3ee;--tone-midnight-bg:#0a1733;--tone-midnight-fg:#93c5fd;--tone-slate-bg:#1e293b;--tone-slate-fg:#94a3b8;--tone-plum-bg:#2a0a2e;--tone-plum-fg:#e9aefc;--ok-fg:#6ee7b7;--ok-bg:#042f1f;--err-fg:#fda4af;--err-bg:#2a0a13}.topbar{justify-content:space-between;align-items:center;gap:16px;width:100%;padding:12px clamp(14px,3vw,24px);display:flex}.brand{color:var(--fg);letter-spacing:-.01em;white-space:nowrap;align-items:center;gap:10px;font-size:15px;font-weight:700;text-decoration:none;display:inline-flex}.brand:hover{color:var(--accent);text-decoration:none}.brand-mark{color:var(--accent);display:inline-flex}.brand-text{line-height:1}.brand-sep{color:var(--fg-subtle);margin:0 2px;font-weight:500}.brand-game{color:var(--fg-muted);white-space:nowrap;font-weight:600}.icon-button{background:var(--bg-elev);border:1px solid var(--border);cursor:pointer;width:40px;height:40px;color:var(--fg-muted);border-radius:999px;justify-content:center;align-items:center;padding:0;transition:background .15s,color .15s,border-color .15s,transform .15s;display:inline-flex}.icon-button:hover{color:var(--fg);border-color:var(--border-strong);transform:translateY(-1px)}.icon-button:focus-visible{outline:2px solid var(--focus);outline-offset:3px}[data-theme=light] .icon-moon,:root:not([data-theme=dark]) .icon-moon,[data-theme=dark] .icon-sun{display:none}.modal-backdrop{z-index:100;overscroll-behavior:contain;background:#0f172a8c;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.modal-backdrop[hidden],.modal-backdrop.hidden{display:none}.modal{background:var(--bg-elev);color:var(--fg);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);width:100%;max-width:560px;max-height:calc(100vh - 32px);font-family:var(--font-sans);padding:24px;position:relative;overflow-y:auto}.modal h2{letter-spacing:-.01em;color:var(--fg);margin:0 0 8px;font-size:1.25rem}.modal p{color:var(--fg-muted);line-height:1.55}.modal-close-x{width:32px;height:32px;color:var(--fg-muted);cursor:pointer;background:0 0;border:none;border-radius:999px;font-size:22px;line-height:1;transition:background .15s,color .15s;position:absolute;top:12px;right:12px}.modal-close-x:hover{background:var(--bg);color:var(--fg)}.modal-close-x:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.arcade-footer{color:var(--fg-subtle);text-align:center;border-top:1px solid var(--border);background:var(--bg);font-size:.9rem;font-family:var(--font-sans);padding:16px clamp(14px,3vw,24px)}.arcade-footer a{color:var(--fg-muted);font-weight:600;text-decoration:none}.arcade-footer a:hover{color:var(--accent);text-decoration:underline}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--fg);font-family:var(--font-sans,system-ui, sans-serif);min-height:100vh;margin:0}.container{max-width:720px;margin:0 auto;padding:16px 16px 64px}.game-head{border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;padding-bottom:12px;display:flex}.theme-line{flex-direction:column;gap:2px;display:flex}.theme-label{letter-spacing:.16em;text-transform:uppercase;color:var(--fg-subtle);font-size:10px;font-weight:600}.theme-name{color:var(--accent);letter-spacing:.02em;font-size:22px;font-weight:700}.scorebox{align-items:center;gap:16px;display:flex}.score-main,.stat{flex-direction:column;align-items:flex-end;line-height:1.1;display:flex}.score-label,.stat-label{letter-spacing:.12em;text-transform:uppercase;color:var(--fg-subtle);font-size:10px}.score-value{color:var(--accent);font-variant-numeric:tabular-nums;font-size:24px;font-weight:700}.stat-value{color:var(--fg-muted);font-variant-numeric:tabular-nums;font-size:15px}.instructions{color:var(--fg-muted);background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius-md);margin:0 0 18px;padding:12px 14px;font-size:13px;line-height:1.5}.instructions strong{color:var(--accent)}.cross-wrap{justify-content:center;margin-bottom:18px;display:flex}.cross{grid-template-rows:auto auto auto;justify-items:center;gap:10px;width:100%;max-width:460px;display:grid}.cross-mid{justify-content:center;align-items:stretch;gap:10px;width:100%;display:flex}.arm{background:var(--bg-elev-2,var(--bg-elev));border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;min-width:92px;min-height:64px;color:var(--fg);flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:12px 10px;font-family:inherit;transition:border-color .12s,transform 80ms,background .12s;display:flex}.arm:hover{border-color:var(--accent)}.arm:active{transform:translateY(1px)}.arm.is-active{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent) inset}.arm.is-solved{background:color-mix(in srgb, var(--accent) 14%, var(--bg-elev));border-color:var(--accent)}.arm-target{letter-spacing:.06em;font-size:16px;font-weight:700}.arm-prog{color:var(--fg-subtle);font-variant-numeric:tabular-nums;font-size:12px}.arm.is-solved .arm-prog{color:var(--accent);font-weight:700}.arm-n,.arm-s{width:120px}.center-cell{background:var(--accent);color:var(--bg-elev,#fff);border-radius:var(--radius-md);justify-content:center;align-items:center;min-width:110px;min-height:64px;padding:10px 14px;display:flex}.center-word{letter-spacing:.08em;font-size:22px;font-weight:800}.panel{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);margin-bottom:18px;padding:16px}.arm-editor-head{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.arm-editor-head h2{margin:0;font-size:15px;font-weight:700}.chip-btn{border:1px solid var(--border);color:var(--fg-muted);cursor:pointer;background:0 0;border-radius:999px;padding:4px 12px;font-family:inherit;font-size:13px}.chip-btn:hover{border-color:var(--accent);color:var(--accent)}.chain{flex-wrap:wrap;align-items:center;gap:6px;min-height:32px;margin-bottom:14px;display:flex}.chain-word{font-family:var(--font-mono,monospace);background:var(--bg-elev-2,var(--bg));border:1px solid var(--border);letter-spacing:.05em;text-transform:uppercase;border-radius:6px;padding:4px 9px;font-size:16px;font-weight:700}.chain-word.is-target{background:var(--accent);color:var(--bg-elev,#fff);border-color:var(--accent)}.chain-goal{font-family:var(--font-mono,monospace);border:1px dashed var(--accent);color:var(--accent);letter-spacing:.05em;text-transform:uppercase;opacity:.8;border-radius:6px;padding:4px 9px;font-size:16px;font-weight:700}.chain-arrow{color:var(--fg-subtle);font-size:14px}.entry-row{flex-wrap:wrap;gap:8px;display:flex}.word-input{background:var(--bg-elev-2,var(--bg));border:1px solid var(--border);min-width:0;font-family:var(--font-mono,monospace);color:var(--fg);text-transform:uppercase;letter-spacing:.08em;border-radius:8px;flex:140px;padding:10px 12px;font-size:18px;font-weight:700}.word-input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.btn{background:var(--accent);color:var(--bg-elev,#fff);cursor:pointer;border:none;border-radius:8px;padding:10px 18px;font-family:inherit;font-size:14px;font-weight:700;transition:filter .12s,transform 80ms}.btn:hover:not(:disabled){filter:brightness(1.08)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.secondary{color:var(--fg-muted);border:1px solid var(--border);background:0 0}.btn.secondary:hover:not(:disabled){color:var(--accent);border-color:var(--accent)}.btn.ghost{color:var(--accent);border:1px dashed var(--accent);background:0 0}.entry-feedback{min-height:1.3em;color:var(--fg-muted);margin-top:10px;font-size:13px}.entry-feedback.good{color:var(--accent)}.entry-feedback.bad{color:#dc2626}[data-theme=dark] .entry-feedback.bad{color:#f87171}.arm-hint-row{flex-wrap:wrap;align-items:center;gap:12px;margin-top:12px;display:flex}.hint-pool{color:var(--fg-subtle);font-size:12px}.endgame{text-align:center;border-radius:var(--radius-md);background:color-mix(in srgb, var(--accent) 12%, var(--bg-elev));border:1px solid var(--accent);margin-bottom:18px;padding:22px 18px}.endgame h2{color:var(--accent);margin:0 0 8px;font-size:22px}.final-score{color:var(--fg-muted);margin-bottom:4px;font-size:15px}.final-score strong{color:var(--accent);font-variant-numeric:tabular-nums;font-size:20px}.endgame-detail{color:var(--fg-subtle);margin-bottom:10px;font-size:13px}.arm-results{border-top:1px solid color-mix(in srgb, var(--accent) 25%, transparent);border-bottom:1px solid color-mix(in srgb, var(--accent) 25%, transparent);flex-direction:column;gap:5px;margin:8px 0 10px;padding:8px 4px;display:flex}.arm-result-row{align-items:center;gap:10px;font-size:13px;display:flex}.arm-result-dir{width:14px;color:var(--fg-subtle);letter-spacing:.1em;font-size:11px;font-weight:700}.arm-result-word{letter-spacing:.05em;text-align:left;flex:1;font-weight:700}.arm-result-diff{font-variant-numeric:tabular-nums;font-size:12px;font-weight:600}.arm-result-diff.at{color:var(--accent)}.arm-result-diff.over{color:var(--fg-muted)}.arm-result-diff.under{color:#22c55e}[data-theme=dark] .arm-result-diff.under{color:#4ade80}.endgame-stats{color:var(--fg-subtle);margin-bottom:14px;font-size:12px}.opt-details{text-align:left;border:1px solid var(--border);border-radius:var(--radius-md);margin:0 0 14px;overflow:hidden}.opt-details summary{cursor:pointer;color:var(--accent);-webkit-user-select:none;user-select:none;padding:9px 12px;font-size:13px;font-weight:600;list-style:none}.opt-details summary::-webkit-details-marker{display:none}.opt-details[open] summary{border-bottom:1px solid var(--border)}.opt-arms{flex-direction:column;gap:16px;padding:12px;display:flex}.opt-arm-label{margin-bottom:8px;font-size:13px}.opt-arm-label strong{font-size:14px}.opt-tag{letter-spacing:.04em;font-size:11px;font-weight:700}.opt-tag.at{color:var(--accent)}.opt-tag.over{color:var(--fg-muted)}.opt-tag.under{color:#22c55e}[data-theme=dark] .opt-tag.under{color:#4ade80}.opt-sublabel{color:var(--fg-subtle);letter-spacing:.12em;text-transform:uppercase;margin-bottom:5px;font-size:10px;font-weight:700}.opt-chain{min-height:auto;margin-bottom:10px}.actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.mode-toggle{border:1px solid var(--border);border-radius:8px;display:inline-flex;overflow:hidden}.mode-btn{color:var(--fg-muted);cursor:pointer;background:0 0;border:none;padding:8px 16px;font-family:inherit;font-size:13px;font-weight:600}.mode-btn.active{background:var(--accent);color:var(--bg-elev,#fff)}.help-ops{margin:6px 0 12px;padding-left:20px;line-height:1.7}.help-ops strong{color:var(--accent)}@media (width<=480px){.container{padding:12px 12px 48px}.game-head{gap:8px}.theme-name{font-size:18px}.score-value{font-size:20px}.arm{min-width:80px;padding:10px 8px}.arm-n,.arm-s{width:104px}.center-cell{min-width:92px}.center-word{font-size:18px}.word-input{font-size:16px}}