@font-face{font-family:Rubik;src:url(fonts/rubik-hebrew.woff2) format("woff2");font-weight:300 900;unicode-range:U+0590-05FF,U+200C-2010,U+20AA,U+25CC,U+FB1D-FB4F;font-display:swap}
@font-face{font-family:Rubik;src:url(fonts/rubik-latin.woff2) format("woff2");font-weight:300 900;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;font-display:swap}
:root{--bg:#f4f8fb;--ink:#26304f;--ink2:#3d4770;--soft:#5b6585;--line:#dfe6ef;--card:#fff;--r:18px;
--teal:#2f7565;--teal2:#3f8f7d;--mint:#5fae9c;--teal-t:#e2f4ef;--teal-b:#cfeadf;
--blue:#2f5b93;--blue-t:#e3eefb;--blue-b:#cfdcf2;
--amber:#8a5a12;--amber-t:#fff6e2;--amber-b:#ead7ae;--gold:#c9a35a;
--green:#47703a;--green-t:#e8f3e3;--cyan:#1d6470;--cyan-t:#def3f5;
--ok:#3f7a4a;--ok-t:#e5f2e3;--bad:#b4463a;--bad-t:#fbe9e5;
--sh:0 2px 10px rgba(40,60,110,.06)}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:Rubik,system-ui,sans-serif;color:var(--ink);background:var(--bg);-webkit-tap-highlight-color:transparent;line-height:1.5}
[hidden]{display:none!important}
button{font-family:inherit;cursor:pointer;color:inherit}
.lu{width:1.15em;height:1.15em;vertical-align:-.2em;flex:none}
[data-i]{display:inline-flex}
:focus-visible{outline:3px solid #7a8ff0;outline-offset:2px}

/* enrichment badge (seder-godel amber chip) */
.enrich{display:inline-flex;align-items:center;gap:.35em;background:var(--amber-t);color:var(--amber);border:1px solid var(--amber-b);font-weight:600;border-radius:999px;padding:.2em .8em;font-size:.82rem;white-space:nowrap}
.enrich.big{font-size:.95rem;padding:.3em 1em}

/* INTRO */
.intro{min-height:100%;display:grid;place-items:center;padding:28px 14px;background:#e9eff3 url(img/intro-bg.webp) center/cover no-repeat}
.intro-card{width:min(820px,100%);background:#fff;border-radius:24px;padding:30px clamp(18px,4vw,44px) 26px;box-shadow:var(--sh);border:1px solid #e3e9f2;text-align:center}
.intro h1{font-size:clamp(2.1rem,6vw,3.4rem);margin:.4em 0 .1em;line-height:1.08;color:var(--ink);font-weight:700;letter-spacing:-.01em}
.intro h1 span{color:var(--teal2)}
.lead{font-size:clamp(1.05rem,2.6vw,1.25rem);margin:.4em auto 1em;max-width:34em;color:var(--soft)}
.formula{display:inline-flex;align-items:center;gap:12px;background:#f7fafc;border:1px solid var(--line);border-radius:18px;padding:12px 22px;margin:6px 0 22px;flex-wrap:wrap;justify-content:center}
.f-word{font-weight:700;font-size:clamp(1.25rem,3.4vw,1.75rem);padding:2px 14px;border-radius:12px}
.f-word.d{background:var(--teal-t);color:var(--teal)}.f-word.m{background:var(--amber-t);color:var(--amber)}.f-word.v{background:var(--blue-t);color:var(--blue)}
.f-eq{font-size:1.8rem;font-weight:700;color:var(--ink2)}
.frac{display:flex;flex-direction:column;align-items:center;gap:6px}
.frac .bar{width:100%;height:3px;background:var(--ink);border-radius:3px}
.f-units{font-size:.92rem;font-weight:500;color:var(--soft);width:100%}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mode-btn{border:0;border-radius:18px;padding:18px 16px;display:flex;flex-direction:column;align-items:center;gap:6px;color:#fff;font-size:1.2rem;transition:background .15s}
.mode-btn .lu{width:2.1rem;height:2.1rem}
.mode-btn b{font-weight:700}
.mode-btn small{font-size:.93rem;opacity:.92;font-weight:400}
.mode-btn.explore{background:var(--teal)}.mode-btn.explore:hover{background:#286757}
.mode-btn.challenge{background:var(--ink)}.mode-btn.challenge:hover{background:#1d2540}
.mode-btn.challenge .lu{color:#f0d79a}
.intro-foot{display:flex;justify-content:center;gap:10px;margin-top:18px;flex-wrap:wrap}
.ghost{border:1px solid var(--line);background:#fff;border-radius:999px;padding:.45em 1.1em;font-size:.98rem;font-weight:500;display:inline-flex;gap:.4em;align-items:center;color:var(--ink2)}
.ghost:hover{background:#eef3ff}

/* LAB */
.lab{height:100%;display:flex;flex-direction:column}
.top{display:flex;align-items:center;gap:12px;padding:8px 14px;background:#fff;color:var(--ink);border-bottom:1px solid var(--line);z-index:2}
.top .title{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.top .title b{font-size:1.2rem;font-weight:700}
.icon-btn{border:1px solid var(--line);background:#fff;color:var(--ink2);border-radius:12px;width:42px;height:42px;display:grid;place-items:center;font-size:1.15rem}
.icon-btn:hover{background:#eef3ff}
.tabs{display:flex;gap:6px;margin-inline-start:auto}
.tab{border:1px solid var(--line);background:#fff;color:var(--ink2);padding:7px 14px;border-radius:999px;font-weight:500;font-size:.98rem;display:inline-flex;gap:.4em;align-items:center}
.tab:hover{background:#eef3ff}
.tab.on{background:var(--ink);border-color:var(--ink);color:#fff}
.top-actions{display:flex;gap:8px}
.pill-btn{border:1px solid var(--line);background:#fff;color:var(--ink2);border-radius:999px;padding:0 14px;height:42px;font-weight:500;display:inline-flex;align-items:center;gap:.4em;font-size:.98rem}
.pill-btn:hover{background:#eef3ff}
.lab-body{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 410px;gap:14px;padding:14px}
.stage-col{min-width:0;min-height:0;display:flex;flex-direction:column;gap:10px}
.stage-wrap{flex:1;min-height:0;background:#ece3d5;border-radius:var(--r);border:1px solid #e3e9f2;box-shadow:var(--sh);overflow:hidden;display:flex;align-items:center;justify-content:center}
#stage{width:100%;height:100%;display:block;overflow:visible;touch-action:none;user-select:none;-webkit-user-select:none}
#stage .obj{cursor:grab}
#stage .obj.sel .outline{stroke:var(--ink);stroke-width:5}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:#fff;border-radius:var(--r);padding:10px 12px;border:1px solid #e3e9f2;box-shadow:var(--sh)}
.sel-name{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:1.05rem;margin-inline-end:4px}
.swatch{width:22px;height:22px;border-radius:6px;border:1px solid rgba(38,48,79,.22);flex:none;display:inline-grid;place-items:center;color:#fff;font-size:.8rem;font-weight:700}
.tb{border:1px solid transparent;border-radius:12px;padding:8px 14px;font-weight:500;font-size:.97rem;display:inline-flex;gap:.4em;align-items:center;color:#fff}
.tb:disabled{opacity:.45;cursor:default}
.tb.scale{background:var(--amber-t);color:var(--amber);border-color:var(--amber-b)}
.tb.water{background:var(--blue-t);color:var(--blue);border-color:var(--blue-b)}
.tb.shelf{background:#eef2f7;color:var(--ink2);border-color:var(--line)}
.tb.rod{background:var(--teal-t);color:var(--teal);border-color:var(--teal-b)}.tb.rod.on{background:var(--teal);color:#fff;border-color:var(--teal)}
.tb.reset{background:#fff;color:var(--ink2);border-color:var(--line);margin-inline-start:auto}
.tb:not(:disabled):hover{filter:brightness(.97)}
.hint-drag{font-size:.9rem;color:var(--soft)}

.panel{min-height:0;overflow:auto;display:flex;flex-direction:column;gap:12px;padding-bottom:6px}
.card{flex:none;background:#fff;border-radius:var(--r);border:1px solid #e3e9f2;box-shadow:var(--sh);overflow:hidden}
.card h3{margin:0;padding:10px 14px;font-size:1.03rem;font-weight:700;display:flex;align-items:center;gap:.45em}
.card .in{padding:12px 14px}
.card.mission h3{background:var(--amber-t);color:var(--amber)}
.card.data h3{background:var(--blue-t);color:var(--blue)}
.card.dens h3{background:var(--teal-t);color:var(--teal)}
.card.why h3{background:var(--cyan-t);color:var(--cyan)}
.card.sets h3{background:var(--green-t);color:var(--green)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--line);background:#fff;color:var(--ink2);border-radius:999px;padding:6px 13px;font-weight:500;font-size:.94rem;display:inline-flex;align-items:center;gap:.35em}
.chip:hover{background:#eef3ff}
.chip.on{background:var(--ink);border-color:var(--ink);color:#fff}
.lvl .stars{display:inline-flex;color:var(--gold)}
.lvl .stars .lu{width:.95em;height:.95em}
.lvl.on .stars{color:#f0d79a}
.mission p{margin:.2em 0 .5em;line-height:1.5}
.story{background:var(--amber-t);border-radius:12px;padding:10px 12px;line-height:1.55;font-size:.97rem;border-inline-start:4px solid var(--gold)}
table.dt{width:100%;border-collapse:separate;border-spacing:0 6px;font-size:.95rem}
.dt th{font-size:.8rem;color:var(--soft);font-weight:500;text-align:center;padding:0 3px;line-height:1.2}
.dt td{padding:0 3px;text-align:center;vertical-align:middle}
.dt td.name{text-align:start;font-weight:600;white-space:nowrap}
.dt td.name .nm{display:inline-flex;align-items:center;gap:6px}
.dt input{width:100%;min-width:0;font:inherit;font-size:16px;font-weight:500;text-align:center;padding:7px 2px;border:1px solid #cfd8e4;border-radius:10px;background:#f7fafc;direction:ltr;color:var(--ink)}
.dt input:focus{border-color:var(--blue);background:#fff}
.dt input.ok{border-color:#9cc79a;background:var(--ok-t)}
.dt input.bad{border-color:#e2a597;background:var(--bad-t)}
.idbtn{border:1px dashed var(--mint);background:var(--teal-t);color:var(--teal);border-radius:10px;padding:6px 6px;font-weight:600;font-size:.85rem;width:100%}
.idbtn.picking{background:var(--teal);color:#fff;border-style:solid;animation:pulse 1.4s infinite}
.idbtn.done{border:1px solid #9cc79a;background:var(--ok-t);color:var(--ok);cursor:default}
@keyframes pulse{50%{box-shadow:0 0 0 4px rgba(63,143,125,.18)}}
.msg{margin-top:8px;border-radius:12px;padding:9px 12px;font-size:.95rem;line-height:1.45;display:flex;gap:8px;align-items:flex-start;background:#eef3ff;color:#34407a}
.msg.ok{background:var(--ok-t);color:#2f5d37}.msg.bad{background:var(--bad-t);color:#8a3328}.msg.tip{background:var(--blue-t);color:var(--blue)}
.formula-line{font-size:.88rem;color:var(--soft);margin-top:2px;line-height:1.4}
.dgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:7px}
.dm{border:1px solid var(--line);border-radius:12px;padding:6px 8px;display:flex;align-items:center;gap:7px;background:#f7fafc;text-align:start;font-size:.92rem;font-weight:500;color:var(--ink)}
.dm .v{margin-inline-start:auto;font-weight:700;direction:ltr;color:var(--ink2)}
.dm.water{background:var(--blue-t);border-color:var(--blue-b)}
.dgrid.picking .dm:not(.water){border-color:var(--mint);background:#fff;cursor:pointer}
.dgrid.picking .dm:not(.water):hover{background:var(--teal-t)}
.dm.wrong{animation:shake .4s;border-color:var(--bad)!important;background:var(--bad-t)!important}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.dens-note{font-size:.85rem;color:var(--soft);margin:8px 0 0}
.why .in{line-height:1.55}
.why .big{font-weight:700;font-size:1.05rem}
.qopts{display:grid;gap:8px;margin-top:8px}
.qopt{border:1px solid var(--amber-b);background:#fffaf0;border-radius:12px;padding:10px 12px;font-weight:500;font-size:1rem;text-align:start;color:var(--ink)}
.qopt:hover{background:var(--amber-t)}
.qopt.bad{border-color:#e2a597;background:var(--bad-t)}
.qopt.ok{border-color:#9cc79a;background:var(--ok-t)}

/* modals */
.modal{position:fixed;inset:0;background:rgba(38,48,79,.45);display:grid;place-items:center;padding:14px;z-index:20}
.modal-card{background:#fff;border-radius:22px;max-width:860px;width:100%;max-height:92vh;overflow:auto;padding:22px;position:relative;box-shadow:0 10px 30px rgba(38,48,79,.18)}
.modal-card h2{margin:0 0 14px;display:flex;gap:.4em;align-items:center;color:var(--ink);font-weight:700}
.modal-card h2 .lu{color:var(--teal2)}
.close{position:absolute;top:12px;left:12px;border:1px solid var(--line);background:#fff;color:var(--ink2);border-radius:12px;width:40px;height:40px;display:grid;place-items:center;font-size:1.15rem}
.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
.ic{border-radius:16px;padding:12px 14px;line-height:1.55}
.ic h3{margin:0 0 4px;font-size:1.03rem;display:flex;gap:.4em;align-items:center;font-weight:700}
.ic p{margin:0;color:#424b6b}
.ic.c1{background:var(--amber-t)}.ic.c1 h3{color:var(--amber)}
.ic.c2{background:var(--teal-t)}.ic.c2 h3{color:var(--teal)}
.ic.c3{background:var(--blue-t)}.ic.c3 h3{color:var(--blue)}
.ic.c4{background:var(--cyan-t)}.ic.c4 h3{color:var(--cyan)}
.ic.c5{background:var(--green-t)}.ic.c5 h3{color:var(--green)}
.win{text-align:center;max-width:520px}
.win .bigstars{display:flex;justify-content:center;gap:10px;margin:8px 0;color:#e3e9f2}
.win .bigstars .lu{width:54px;height:54px}
.win .bigstars .lit{color:var(--gold);animation:pop .45s backwards}
.win .bigstars .lit:nth-child(2){animation-delay:.12s}.win .bigstars .lit:nth-child(3){animation-delay:.24s}
@keyframes pop{0%{transform:scale(.4);opacity:0}100%{transform:scale(1);opacity:1}}
.win h2{justify-content:center;font-size:1.6rem}
.win p{font-size:1.06rem;line-height:1.55;color:#424b6b}
.win .row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:12px}
.win .tb{font-size:1.03rem;padding:10px 18px}
.tb.go{background:var(--teal);border-color:var(--teal)}.tb.again{background:#fff;color:var(--ink2);border-color:var(--line)}
#confetti{position:fixed;inset:0;pointer-events:none;z-index:30;overflow:hidden}
#confetti i{position:absolute;top:-14px;width:7px;height:11px;border-radius:2px;animation:fall ease-in forwards;opacity:.9}
@keyframes fall{to{transform:translateY(60vh) rotate(260deg);opacity:0}}

/* responsive */
@media (max-width:1100px){.lab-body{grid-template-columns:minmax(0,1fr) 360px}}
@media (max-width:900px){
  .lab{height:auto;min-height:100%}
  .lab-body{grid-template-columns:1fr;padding:10px;gap:10px}
  .stage-wrap{flex:none}
  #stage{height:auto}
  .panel{overflow:visible}
  .top{flex-wrap:wrap;gap:8px;padding:8px 10px}
  .top .title b{font-size:1.08rem}
  .top .title{flex:1;min-width:0;flex-direction:column;align-items:flex-start;gap:3px}
  .tabs{order:5;width:100%;margin:0}
  .tab{flex:1;justify-content:center;padding:7px 6px;font-size:.94rem}
  .top-actions{margin-inline-start:auto}
}
@media (max-width:560px){
  .modes{grid-template-columns:1fr}
  .top .title .enrich{font-size:.74rem}
  .pill-btn .t{display:none}
  .pill-btn{padding:0 11px}
  .tb{padding:8px 10px;font-size:.9rem}
  .hint-drag{display:none}
  .dt{font-size:.88rem}
  .dt th{font-size:.72rem}
  .intro{padding:16px 10px;align-items:start}
}

.mloupe{display:none}
@media (max-width:900px){
  .stage-col{position:relative}
  .mloupe{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--teal-b);border-radius:var(--r);padding:6px 12px;font-size:.95rem;font-weight:500;color:var(--teal);line-height:1.3}
  .mloupe svg{width:96px;height:96px;display:block;flex:none}
  .mloupe br{display:none}
}

/* challenge step bar (9554770e) */
.tab .tab-n{font-size:.74rem;font-weight:600;background:var(--amber-t);color:var(--amber);border:1px solid var(--amber-b);border-radius:999px;padding:0 7px;line-height:1.5;white-space:nowrap}
.tab.on .tab-n{background:#fff;color:var(--ink);border-color:#fff}
.mini-steps{display:flex;gap:6px;margin-top:4px}
.mini-steps i{font-style:normal;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:.85rem;font-weight:700;background:rgba(255,255,255,.14);border:1.5px solid rgba(255,255,255,.55)}
.mini-steps i:first-child{background:#fff;color:var(--ink);border-color:#fff}
.stepbar{flex:none;background:#fff;border:1px solid #e3e9f2;border-radius:var(--r);box-shadow:var(--sh);padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.stepbar[hidden]{display:none}
.sb-head{display:flex;align-items:center;gap:6px 12px;flex-wrap:wrap}
.sb-head b{font-size:1.06rem;font-weight:700;display:inline-flex;gap:.4em;align-items:center;color:var(--ink)}
.sb-sub{color:var(--teal);font-weight:600;font-size:.98rem}
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;list-style:none;margin:0;padding:0}
.step{width:100%;height:100%;display:flex;align-items:center;gap:10px;border:2px solid var(--line);background:#fff;color:var(--ink2);border-radius:14px;padding:8px 10px;font:inherit;text-align:start;cursor:pointer;min-height:58px}
.step:hover{border-color:#b9c4d6}
.step .n{flex:none;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:1.1rem;background:#eef2f7;color:var(--ink2);border:2px solid #cfd8e4}
.step .n .lu{width:20px;height:20px}
.step .lb{display:flex;flex-direction:column;min-width:0;line-height:1.2}
.step .lb b{font-weight:600;font-size:1rem;display:inline-flex;gap:.3em;align-items:center}
.step .lb small{font-size:.8rem;color:var(--soft);font-weight:500}
.step .st{display:inline-flex;color:var(--gold);margin-top:2px}.step .st .lu{width:.95em;height:.95em}
.step.done{border-color:var(--teal-b);background:var(--teal-t)}
.step.done .n{background:var(--mint);border-color:var(--mint);color:#fff}
.step.on{border-color:var(--ink);background:var(--ink);color:#fff}
.step.on .n{background:#fff;border-color:#fff;color:var(--ink)}
.step.on.done .n{background:var(--mint);border-color:var(--mint);color:#fff}
.step.on .lb small{color:#fff;font-weight:600}
.step.on .st{color:#f0d79a}
.sb-next{display:flex;align-items:center;justify-content:center;gap:.5em;width:100%;border:0;border-radius:12px;background:var(--teal);color:#fff;font:inherit;font-weight:700;font-size:1.04rem;padding:11px 14px;cursor:pointer}
.sb-next:hover{background:#286757}
.win-left{font-size:1.25rem;font-weight:700;color:var(--teal);margin:-4px 0 10px}
.win-steps{display:flex;justify-content:center;gap:10px;list-style:none;margin:0 0 6px;padding:0}
.win-steps li{display:flex;flex-direction:column;align-items:center;gap:3px;min-width:58px}
.win-steps .n{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:700;background:#eef2f7;color:var(--ink2);border:2px solid #cfd8e4}
.win-steps .n .lu{width:18px;height:18px}
.win-steps .done .n{background:var(--mint);border-color:var(--mint);color:#fff}
.win-steps .next .n{background:var(--ink);border-color:var(--ink);color:#fff}
.win-steps small{font-size:.8rem;color:var(--soft)}
.win .next-big{display:flex;width:100%;justify-content:center;margin-top:14px;font-size:1.15rem;padding:13px 18px;font-weight:700}
@media (max-width:560px){
  .stepbar{padding:8px}
  .steps{gap:5px}
  .step{flex-direction:column;justify-content:flex-start;gap:4px;padding:7px 3px;text-align:center;min-height:0}
  .step .n{width:32px;height:32px;font-size:1rem}
  .step .lb{align-items:center}
  .step .lb b{font-size:.82rem}
  .step .lb small{font-size:.72rem}
  .sb-next{font-size:.96rem}
  .tab .tab-n{font-size:.68rem;padding:0 5px}
  .win-steps{gap:4px}.win-steps li{min-width:0;flex:1}
}
.step .st .lu{fill:currentColor}

.intro-foot{flex-wrap:wrap}