/* Classic Control Lab — fx.css
   Engagement layer: sound toggle, story strip, live machines, hidden faults + multimeter,
   points / timer / leaderboard, challenge-a-friend. Same tokens as engine.css. */
.fx-mute{min-width:48px;font-size:1.15rem;padding-inline:10px}
.fx-mute[aria-pressed="true"]{opacity:.7}
body.fx-flash{animation:fx-flash .45s ease-out 1}
@keyframes fx-flash{0%{box-shadow:inset 0 0 0 100vmax rgba(255,230,140,.55)}100%{box-shadow:inset 0 0 0 100vmax rgba(255,230,140,0)}}
@media (prefers-reduced-motion:reduce){body.fx-flash{animation:none}}

/* ---------- story strip at the top of the task card ---------- */
.bn-story{display:flex;gap:10px;align-items:flex-start;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:6px 0 8px}
.bn-story-ico{font-size:1.7rem;line-height:1.1;flex:none}
.bn-story-b{display:grid;gap:3px;min-width:0}
.bn-story-t{margin:0;line-height:1.75}
.bn-story-a{margin:0;color:var(--accent);font-size:.92rem;line-height:1.6}
.bn-story-a b{color:var(--ink)}

/* ---------- fx bar (timer, points, buttons) ---------- */
.bn-fx{display:grid;gap:10px;min-width:0}
.bn-fx:empty{display:none}
.fx-bar{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:8px 12px;font-size:.9rem}
.fx-bar .fx-clock{font:600 1.05rem var(--font-mono);direction:ltr;unicode-bidi:isolate;min-width:4.5ch}
.fx-bar .fx-clock.over{color:var(--bad)}
.fx-bar .fx-tgt,.fx-bar .fx-best{color:var(--muted)}
.fx-bar .fx-btns{display:flex;gap:6px;flex-wrap:wrap;margin-inline-start:auto}
.fx-bar .btn{min-height:38px;padding:4px 10px;font-size:.88rem}
.fx-pass{border:1px solid var(--good);background:var(--good-soft);border-radius:10px;padding:10px 12px;display:grid;gap:6px}
.fx-pass .fx-pts{font:700 1.3rem var(--font-display);color:var(--good)}
.fx-pass .fx-detail{font-size:.86rem;color:var(--muted)}
.fx-pass .fx-badge-new{display:inline-block;background:var(--accent);color:#fff;border-radius:999px;padding:2px 10px;font-weight:700;font-size:.85rem;margin-inline-end:6px}
.fx-name{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.fx-name input{border:1px solid var(--line);border-radius:8px;padding:6px 10px;min-height:40px;background:var(--panel);min-width:160px}

/* ---------- live machine ---------- */
.bn-machine{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:8px 10px;display:grid;gap:6px;min-width:0}
.bn-machine[hidden]{display:none}
.bn-machine .fx-mh{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.bn-machine .fx-mh h4{margin:0;font-size:.95rem;font-family:var(--font-display)}
.bn-machine .fx-mh .fx-mst{font-size:.84rem;color:var(--muted);margin-inline-start:auto}
.bn-machine .fx-mh .fx-mst.on{color:var(--good);font-weight:700}
.bn-machine .fx-mh button{min-height:32px;padding:2px 8px;font-size:.8rem}
.bn-machine svg{width:100%;height:auto;max-height:230px;display:block;direction:ltr;background:var(--board);border-radius:8px}
.bn-machine.off svg{display:none}
.fx-m text{font-family:var(--font-body);font-size:11px;fill:var(--ink)}
.fx-m .mono{font-family:var(--font-mono)}
.fx-m .lamp{fill:#4b5257}.fx-m .lamp.on{fill:#36e070}
.fx-m .lamp.f{fill:#ff4a3d}
.fx-m .belt{stroke:#2a2d30;stroke-width:3;fill:none;stroke-dasharray:6 6}
.fx-m .water{fill:#4ea0ff;opacity:.75}
.fx-m .ripple{stroke:#cfe9ff;fill:none;stroke-width:1.2;opacity:0}
.fx-m[data-run="1"] .ripple{animation:fx-ripple 1.4s linear infinite}
.fx-m[data-run="1"] .ripple.r2{animation-delay:.7s}
@keyframes fx-ripple{0%{opacity:.9;transform:scale(.4)}100%{opacity:0;transform:scale(1.6)}}
.fx-m .ripple{transform-box:fill-box;transform-origin:center}
.fx-m .spin{transform-box:fill-box;transform-origin:center}
.fx-m .blur{opacity:0}
.fx-m[data-run="1"] .blur{opacity:.35}
.fx-m .needle{transform-box:fill-box;transform-origin:50% 100%;transition:transform .25s linear}
.fx-m .arrow{opacity:.15}.fx-m .arrow.on{opacity:1}
.fx-m .mode{font-weight:700;font-size:12px}
@media (prefers-reduced-motion:reduce){.fx-m .ripple{animation:none}}

/* ---------- hidden fault + multimeter ---------- */
.fx-fault{border:1px solid color-mix(in srgb,var(--warn) 60%,var(--line));background:var(--warn-soft);border-radius:10px;padding:10px 12px;display:grid;gap:8px}
.fx-fault h4{margin:0;font-size:1rem;font-family:var(--font-display)}
.fx-fault .fx-sym{margin:0}
.fx-fault .fx-fbtns{display:flex;gap:6px;flex-wrap:wrap}
.fx-fault .fx-fbtns .btn{min-height:40px}
.fx-fault .fx-fnote{margin:0;font-size:.88rem;color:var(--muted)}
.fx-fault .fx-fnote.bad{color:var(--bad);font-weight:600}
.fx-fault .fx-fnote.good{color:var(--good);font-weight:600}
.fx-fault .fx-explain{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:8px 10px;display:grid;gap:4px}
.fx-fault .fx-explain p{margin:0;line-height:1.7}
.fx-meter{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 12px;align-items:center;background:#1d2226;color:#e9eaec;border-radius:10px;padding:8px 10px;border:2px solid #3b4247}
.fx-meter .lcd{grid-row:1/3;background:#9fb79a;color:#111;font:700 1.35rem var(--font-mono);direction:ltr;unicode-bidi:isolate;border-radius:6px;padding:6px 12px;min-width:7.5ch;text-align:right;border:2px inset #5e6b5c;line-height:1.2}
.fx-meter .lcd small{display:block;font-size:.72rem;font-weight:500;text-align:left}
.fx-meter .modes{display:flex;gap:6px;flex-wrap:wrap}
.fx-meter .modes button{background:#2c3338;border:1px solid #4b5257;color:#e9eaec;border-radius:999px;padding:4px 12px;min-height:34px;cursor:pointer;font-weight:700}
.fx-meter .modes button[aria-pressed="true"]{background:#f0a03c;color:#111;border-color:#f0a03c}
.fx-meter .probes{font-size:.84rem;color:#c8d0d6}
.fx-meter .probes b{color:#ff8a80}.fx-meter .probes b.blk{color:#cfd3d6}
.fx-meter .probes .mono{color:#fff}
.bn.fx-metering .bt-hit{cursor:crosshair}
.bn.fx-picking [data-cell],.bn.fx-picking .bw-hit{cursor:pointer}
.bn.fx-picking .bd-cell{stroke:var(--accent);stroke-dasharray:4 4}
.fx-pick{display:flex;gap:6px;flex-wrap:wrap;align-items:center;background:var(--panel);border:1px solid var(--accent);border-radius:10px;padding:8px 10px}
.fx-pick b{margin-inline-end:6px}

/* ---------- challenge ---------- */
.fx-modal{position:fixed;inset:0;background:rgba(0,0,0,.55);display:grid;place-items:center;z-index:60;padding:16px}
.fx-modal .box{background:var(--panel);color:var(--ink);border-radius:14px;padding:18px;max-width:440px;width:100%;display:grid;gap:12px;border:1px solid var(--line);max-height:90vh;overflow:auto}
.fx-modal h3{margin:0}
.fx-modal label{display:grid;gap:4px;font-size:.9rem}
.fx-modal input{border:1px solid var(--line);border-radius:8px;padding:8px 10px;min-height:42px;background:var(--panel)}
.fx-modal .row{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.fx-modal .res{display:grid;gap:6px}
.fx-modal .res .pl{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:8px 10px}
.fx-modal .res .pl.win{border-color:var(--good);background:var(--good-soft)}
.fx-modal .res .pl .n{font-weight:700}
.fx-modal .res .pl .t{font:600 1rem var(--font-mono);direction:ltr}
.fx-modal textarea{width:100%;min-height:80px;border:1px solid var(--line);border-radius:8px;padding:8px;background:var(--panel);font:inherit}
.fx-turn{border:2px solid var(--accent);background:var(--accent-soft);border-radius:10px;padding:10px 12px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.fx-turn b{font-size:1.05rem}
.fx-turn .fx-tm{font:600 1.05rem var(--font-mono);direction:ltr;margin-inline-start:auto}

/* ---------- hub: leaderboard, badges, points on lesson cards ---------- */
.fx-hub{display:grid;gap:12px}
.fx-hub .fx-top{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center}
.fx-hub .fx-total{font:700 1.5rem var(--font-display);color:var(--accent)}
.fx-hub .fx-total small{font:500 .85rem var(--font-body);color:var(--muted);margin-inline-start:6px}
.fx-badges{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.fx-badges li{border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:.86rem;background:var(--bg);opacity:.5;display:inline-flex;gap:6px;align-items:center}
.fx-badges li.on{opacity:1;border-color:var(--accent);background:var(--accent-soft);font-weight:700}
.fx-lb{width:100%;border-collapse:collapse;font-size:.9rem}
.fx-lb th,.fx-lb td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:start}
.fx-lb tr.me td{background:var(--accent-soft);font-weight:700}
.fx-lb .mono{font-family:var(--font-mono);direction:ltr;unicode-bidi:isolate}
.les .fx-pts,.g-card .fx-pts{display:inline-block;font:700 .78rem var(--font-display);color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:1px 8px;margin-inline-start:6px;white-space:nowrap}