:root{--bg:#f4f8fb;--ink:#26304f;--ink2:#3d4770;--soft:#5b6585;--line:#dfe6ef;--mint:#5fae9c;--mintdk:#2f7565;--okbg:#e5f5ef;--okb:#bfe3d4;--okt:#2c6a5b;--warnbg:#fff6e2;--warnt:#8a5a12;--warnb:#ead7ae;--badbg:#fdecea;--badt:#9a3412;--infobg:#e3eefb;--infot:#2f5b93;--moose:#a0612b;--wolf:#3d5a80;--forest:#4f7a3a}
@font-face{font-family:Rubik;src:url(fonts/rubik-regular.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:Rubik;src:url(fonts/rubik-medium.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:Rubik;src:url(fonts/rubik-bold.woff2) format("woff2");font-weight:700;font-display:swap}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0}
body{font-family:Rubik,system-ui,sans-serif;color:var(--ink);background:#eef4f7 linear-gradient(180deg,#e4eef5 0%,#f2f6f8 40%,#eef3ec 100%) fixed;font-size:16.5px;line-height:1.5;min-height:100vh}
main{max-width:1340px;margin:0 auto;padding:12px 14px 10px;display:flex;flex-direction:column;gap:12px;min-height:100vh}
.i{width:1.15em;height:1.15em;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.2em;flex:none}
.card{background:#fff;border:1px solid #e3e9f2;border-radius:18px;box-shadow:0 2px 10px rgba(40,60,110,.06)}
.top{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.94);border:1px solid #e3e9f2;border-radius:18px;padding:8px 12px;flex-wrap:wrap}
.hb{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 12px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--ink2);font:inherit;font-weight:500;font-size:15px;text-decoration:none;cursor:pointer;white-space:nowrap}
.hb:hover{border-color:#c9d4e3}
.tt{flex:1;min-width:180px}
.tt h1{margin:0;font-size:23px;line-height:1.2}
.kick{margin:0;color:var(--mintdk);font-weight:500;font-size:14.5px}
.dur{display:inline-flex;align-items:center;gap:6px;white-space:nowrap;background:var(--okbg);border:1px solid var(--okb);color:var(--okt);border-radius:999px;padding:5px 12px;font-weight:500;font-size:15px}
.tabs{display:flex;gap:8px;flex-wrap:wrap}
.tab{font:inherit;display:inline-flex;align-items:center;gap:8px;min-height:46px;padding:0 16px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink2);font-weight:500;font-size:15.5px;cursor:pointer}
.tab .n{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:#e8edf4;color:var(--ink);font-size:13.5px;font-weight:700}
.tab.on{background:var(--ink);border-color:var(--ink);color:#fff}
.tab.on .n{background:#fff;color:var(--ink)}
.tab.done .n{background:var(--mint);color:#fff}
.tab:disabled{opacity:.5;cursor:default}
.btn{font:inherit;font-weight:500;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 20px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--mintdk);cursor:pointer;font-size:17px}
.btn.pri{background:var(--mint);border-color:var(--mint);color:#fff}
.btn.pri:active{background:var(--mintdk)}
.btn:disabled{opacity:.45;cursor:default}
.btn:focus-visible,.opt:focus-visible,.tab:focus-visible,.hb:focus-visible,.wch:focus-visible,textarea:focus-visible{outline:3px solid var(--mint);outline-offset:2px}
.start{max-width:980px;width:100%;margin:2vh auto 0;overflow:hidden;display:grid;grid-template-columns:1.1fr 1fr}
.start .art{position:relative;min-height:340px;background:#cfdde6}
.start .art canvas{position:absolute;inset:0;width:100%;height:100%}
.start .txt{padding:24px 24px 22px;display:flex;flex-direction:column;gap:10px}
.start h2{margin:2px 0 0;font-size:27px;line-height:1.25}
.start p{margin:0;color:var(--ink2)}
.steps{margin:4px 0 6px;padding:0;list-style:none;counter-reset:s;display:flex;flex-direction:column;gap:6px}
.steps li{counter-increment:s;font-size:15.5px;color:var(--ink2);display:flex;align-items:center;gap:8px}
.steps li::before{content:counter(s);display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--ink);color:#fff;font-size:13px;font-weight:700;flex:none}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.tlink{color:var(--soft);font-size:15px;display:inline-flex;align-items:center;gap:6px;text-decoration:none;border-bottom:1px solid transparent}
.tlink:hover{border-color:var(--soft)}
.lab{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(330px,1fr);gap:12px;align-items:stretch}
.stage{padding:10px;display:flex;flex-direction:column;gap:8px}
.isl{position:relative;border-radius:14px;overflow:hidden;background:#c9d9e3;aspect-ratio:2.4/1}
.isl canvas{position:absolute;inset:0;width:100%;height:100%}
.yr{position:absolute;top:10px;right:12px;background:rgba(255,255,255,.92);border-radius:12px;padding:2px 12px;font-weight:700;font-size:26px;color:var(--ink);font-variant-numeric:tabular-nums}
.cnt{position:absolute;bottom:10px;right:12px;display:flex;gap:8px;flex-wrap:wrap}
.cc{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.94);border-radius:999px;padding:3px 12px;font-weight:500;font-size:15.5px}
.cc b{font-size:19px;font-variant-numeric:tabular-nums}
.cc .dot{width:12px;height:12px;border-radius:50%}
.leg{position:absolute;top:12px;left:12px;background:rgba(255,255,255,.9);border-radius:10px;padding:3px 10px;font-size:13.5px;color:var(--ink2)}
.grw{position:relative;height:290px}
.grw canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:pan-y}
.gtip{position:absolute;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:10px;padding:4px 10px;font-size:14.5px;box-shadow:0 2px 10px rgba(40,60,110,.12);white-space:nowrap}
.side{padding:16px 18px;display:flex;flex-direction:column;gap:10px}
.side h2{margin:0;font-size:22px;line-height:1.3}
.sp{margin:0;color:var(--ink2)}
.say{display:flex;gap:10px;align-items:flex-start;background:var(--infobg);color:#24456f;border-radius:14px;padding:10px 12px}
.av{flex:none;width:42px;height:42px;border-radius:50%;background:#2f5b93;color:#fff;display:grid;place-items:center;font-weight:700;font-size:17px}
.say .who{font-weight:700;font-size:14.5px;display:block}
.q{font-weight:700;margin:4px 0 0;font-size:17.5px}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{font:inherit;text-align:right;min-height:48px;padding:10px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;font-size:16px;display:flex;align-items:center;gap:10px}
.opt:hover:not(:disabled){border-color:#b9c7d8}
.opt.sel{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.opt.ok{background:var(--okbg);border-color:var(--okb);color:var(--okt)}
.opt.bad{background:var(--badbg);border-color:#f3c9c2;color:var(--badt)}
.opt:disabled{cursor:default}
.fb{border-radius:14px;padding:10px 12px;font-size:15.5px;display:flex;gap:8px;align-items:flex-start}
.fb.ok{background:var(--okbg);color:var(--okt);border:1px solid var(--okb)}
.fb.tip{background:var(--warnbg);color:var(--warnt);border:1px solid var(--warnb)}
.fb.info{background:var(--infobg);color:var(--infot)}
.fb .i{margin-top:.2em}
.ctl{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto;padding-top:4px}
.wpick{display:flex;gap:8px;flex-wrap:wrap}
.wch{font:inherit;min-width:64px;min-height:52px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:700;font-size:19px;cursor:pointer;padding:2px 12px;line-height:1.15}
.wch.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.wch small{display:block;font-weight:400;font-size:12.5px}
.res{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.rb{border-radius:14px;padding:8px 10px;background:#f6f8fb;border:1px solid var(--line)}
.rb .l{font-size:13.5px;color:var(--soft);display:flex;gap:5px;align-items:center}
.rb b{font-size:21px;font-variant-numeric:tabular-nums}
.rb.good{background:var(--okbg);border-color:var(--okb)}
.rb.warn{background:var(--warnbg);border-color:var(--warnb)}
.runs{font-size:14.5px;color:var(--soft);margin:0}
textarea{font:inherit;font-size:16px;width:100%;min-height:110px;border-radius:14px;border:1px solid #cfd8e5;padding:10px 12px;resize:vertical;color:var(--ink)}
.sum{display:flex;flex-direction:column;gap:8px;margin:0;padding:0;list-style:none}
.sum li{display:flex;gap:10px;align-items:flex-start;background:#f6f8fb;border-radius:14px;padding:10px 12px}
.sum li .i{color:var(--mintdk);margin-top:.2em}
.foot{margin-top:auto;display:flex;align-items:center;gap:12px;flex-wrap:wrap;color:var(--soft);font-size:14px;padding:6px 4px}
.foot a{color:var(--ink2)}
.foot .fbk{display:inline-flex;align-items:center;gap:6px;text-decoration:none;font-weight:500}
.cred{flex:1;min-width:260px}
details.a11y summary{cursor:pointer}
@media (max-width:980px){.lab{grid-template-columns:1fr}}
@media (max-width:760px){.start{grid-template-columns:1fr}.start .art{min-height:210px}}
@media (max-width:560px){main{padding:8px 8px}.tt h1{font-size:20px}.hb .lbl{display:none}.hb{padding:0 10px}.tab{padding:0 12px;font-size:14.5px}.tab .t{display:none}.tab.on .t{display:inline}.grw{height:250px}.yr{font-size:21px}.cc{font-size:14px}.cc b{font-size:16.5px}.leg{display:none}.rb b{font-size:18px}.start .txt{padding:18px}.start h2{font-size:23px}.dur{font-size:14px}}
body.proj{font-size:19px}
body.proj .tt h1{font-size:28px}
body.proj .side h2{font-size:26px}
body.proj .opt{font-size:19px}
.qd{display:flex;flex-direction:column;gap:2px;background:#f6f8fb;border:1px solid #e6ebf2;border-radius:14px;padding:8px 12px}
.qd .qq{font-size:14.5px;color:var(--soft)}
.qd .qa{font-weight:500;color:var(--okt);display:flex;gap:6px;align-items:center}
.qd .qo{font-size:14.5px;color:var(--ink2)}
@media (min-width:981px){.lab{height:calc(100vh - 160px);min-height:540px}.stage{height:100%}.isl{aspect-ratio:auto;flex:0 0 44%}.grw{flex:1;height:auto;min-height:220px}.side{height:100%;overflow-y:auto;scrollbar-gutter:stable}}
.glegend{position:absolute;top:2px;left:50%;transform:translateX(-50%);font-size:13.5px;color:var(--ink2);background:rgba(255,255,255,.9);border-radius:999px;padding:1px 10px;white-space:nowrap}
@media (max-width:560px){.glegend{top:auto;bottom:-2px;font-size:12.5px}.grw{margin-bottom:14px}}
.cc.mdl{font-size:12.5px;color:#5b6585;background:#f1f4f8}
.wpick.w2{display:grid;grid-template-columns:1fr 1fr}
.wpick.w2 .wch{font-size:15.5px;padding:8px 10px;text-align:center}
@media (max-width:980px){.isl{aspect-ratio:1.7/1}}

/* שני מסלולים */
.tracks{display:flex;flex-direction:column;gap:8px;margin-top:2px}
.tracks h3{margin:0;font-size:16px;color:var(--ink)}
.tpair{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.trc{font:inherit;text-align:right;display:flex;align-items:center;gap:10px;min-height:76px;padding:10px 12px;border-radius:14px;border:1.5px solid var(--line);background:#fff;color:var(--ink);cursor:pointer}
.trc:hover,.trc.on{border-color:var(--mint)}
.trc.on{background:#f3faf7}
.trc:focus-visible{outline:3px solid var(--mint);outline-offset:2px}
.trc .ti{width:28px;height:28px;color:var(--mintdk)}
.trc .tb{display:flex;flex-direction:column;gap:1px;min-width:0}
.trc b{font-size:16.5px}
.trc .tl{font-size:14px;color:var(--ink2);line-height:1.3}
.trc .tm{font-size:13.5px;color:var(--mintdk);font-weight:500}
.tnote{font-size:13.5px!important;color:var(--soft)!important}
.steps li.adv small{color:var(--soft);font-size:13px}
.trk{font:inherit;display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 12px;border-radius:999px;border:1px solid var(--okb);background:#fff;color:var(--mintdk);font-weight:500;font-size:14.5px;cursor:pointer;white-space:nowrap}
.trk:hover{border-color:var(--mint)}
.trk .sw{width:.95em;height:.95em;opacity:.7}
.trline{display:flex;align-items:center;gap:6px;font-size:14.5px;color:var(--soft);margin:6px 0 0}
.endsum .ctl{margin-top:8px}
.nq{display:flex;flex-direction:column;gap:6px}
.numrow{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.numrow .num{font:inherit;font-size:18px;width:110px;min-height:48px;border-radius:14px;border:1px solid #cfd8e5;padding:6px 12px;text-align:center;color:var(--ink);direction:ltr}
.numrow .num:focus-visible{outline:3px solid var(--mint);outline-offset:2px}
.numrow .unit{color:var(--ink2);font-weight:500}
.wpick.w3{grid-template-columns:repeat(5,1fr)}
.wpick.w3 .wch{padding:8px 4px}
@media (max-width:560px){.tpair{grid-template-columns:1fr}.trc{min-height:68px}.trk{padding:0 10px}}

/* tracks-depth v1 (shared look for the 10 bio sims; Nov 11) — adapted to .start.card grid + .trc cards */
.start{--trkbg:url(img/lab-bg.webp?v=1);position:relative;isolation:isolate;display:block;border:0;padding:170px 18px 18px;box-shadow:0 2px 6px rgba(20,40,60,.08),0 18px 40px rgba(20,40,60,.16)}
.start::before{content:"";position:absolute;inset:-8px;z-index:-2;background:var(--trkbg) center 30%/cover no-repeat;filter:saturate(1.05)}
.start::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(255,255,255,0) 0%,rgba(255,255,255,.08) 22%,rgba(246,249,248,.70) 48%,rgba(246,249,248,.90) 70%,rgba(246,249,248,.94) 100%)}
.start .art{display:none!important}
.start .txt{background:rgba(255,255,255,.82);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:16px;padding:18px 20px;box-shadow:0 6px 18px rgba(20,40,60,.14)}
.tracks h3{font-size:19px;font-weight:700}
.tpair{gap:14px}
.trc{position:relative;border:1px solid rgba(255,255,255,.9);border-radius:18px;padding:14px 16px;min-height:88px;gap:14px;
  background:linear-gradient(165deg,#ffffff 0%,#f8fbfa 60%,#eff5f3 100%);
  box-shadow:0 1px 2px rgba(20,40,60,.08),0 10px 24px rgba(20,40,60,.14);transition:transform .18s ease,box-shadow .18s ease,border-color .18s}
.trc:hover,.trc.on,.trc[aria-pressed="true"]{transform:translateY(-3px);box-shadow:0 2px 4px rgba(20,40,60,.10),0 16px 34px rgba(20,40,60,.20);border-color:var(--trkacc,#3f9a86)}
.trc.on{background:linear-gradient(165deg,#ffffff 0%,#f3faf7 60%,#e8f4ef 100%)}
.trc .ti{width:58px;height:58px;padding:14px;box-sizing:border-box;flex:none;border-radius:16px;stroke-width:2.1;box-shadow:inset 0 -3px 0 rgba(0,0,0,.06),0 4px 10px rgba(20,40,60,.12)}
.trc[data-track="basic"] .ti{background:linear-gradient(145deg,#e9f6f0,#bfe3d4);color:#2a6f60}
.trc[data-track="adv"]{--trkacc:#c98a3a}
.trc[data-track="adv"] .ti{background:linear-gradient(145deg,#fdf1e2,#f3cf9f);color:#9a5a12}
.trc[data-track="adv"] .tm{color:#9a5a12}
.trc b{font-size:18.5px}
.tnote{color:#4a5470!important}
@media (max-width:760px){.start{grid-template-columns:none}}
@media (max-width:560px){.start{padding:150px 10px 10px}.start .txt{padding:16px}.trc{min-height:78px}.trc .ti{width:50px;height:50px;padding:12px}}
.start::before{bottom:auto;height:420px;background-position:center 58%;-webkit-mask-image:linear-gradient(180deg,#000 55%,transparent 100%);mask-image:linear-gradient(180deg,#000 55%,transparent 100%)}
.start{background:#eef4f6}
@media (max-width:560px){.start::before{height:330px}}
@media (prefers-reduced-motion:reduce){.trc{transition:none}.trc:hover{transform:none}}

/* ===== rich experience v4 (Nov 12): lab picture, Gause, glass tubes, modern graph, enlarge ===== */
.start{--trkbg:url(img/lab-bg.webp?v=1)}
.start::before{background-position:center 62%}
.start .sg{position:absolute;top:18px;left:4%;height:190px;width:auto;z-index:-1;filter:drop-shadow(0 6px 10px rgba(60,40,20,.25));pointer-events:none}
@media (max-width:560px){.start .sg{height:150px;top:8px}}
.stage{padding:10px;gap:6px;background:linear-gradient(180deg,#ffffff,#f7faf9)}
.isl{background:#e9dcc4;box-shadow:inset 0 0 0 1px rgba(80,60,30,.10),0 6px 18px rgba(60,40,20,.14);border-radius:16px}
@media (min-width:981px){.isl{flex:0 0 56%;aspect-ratio:auto}.grw{min-height:180px}}
.yr{top:10px;right:12px;background:rgba(255,255,255,.88);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);box-shadow:0 3px 10px rgba(60,40,20,.18);border-radius:14px;padding:3px 14px}
.cnt{bottom:8px;right:auto;left:10px;gap:6px}
.cc{background:rgba(255,255,255,.9);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);box-shadow:0 2px 8px rgba(60,40,20,.16);padding:3px 12px 3px 8px}
.cc img{width:26px;height:26px;margin-inline-end:2px}
.cc img:not([src]){visibility:hidden}
.leg{top:auto;bottom:10px;left:auto;right:12px;background:rgba(255,255,255,.82);font-size:13px}
.gbub{position:absolute;z-index:2;background:#fff;color:var(--ink);border-radius:16px 16px 4px 16px;padding:7px 12px 8px;font-size:15.5px;line-height:1.35;box-shadow:0 6px 18px rgba(40,30,15,.22);pointer-events:none;transform-origin:100% 100%}
.gbub b{display:block;font-size:12.5px;color:var(--mintdk);font-weight:700}
.gbub::after{content:"";position:absolute;right:-6px;bottom:6px;border:7px solid transparent;border-left-color:#fff;border-bottom-color:#fff;transform:rotate(-20deg)}
.gbub.pop{animation:gpop .35s ease-out}
@keyframes gpop{from{opacity:0;transform:scale(.85) translateY(6px)}to{opacity:1;transform:none}}
.bigb{position:absolute;top:10px;left:10px;z-index:3;display:inline-flex;align-items:center;gap:6px;font:inherit;font-weight:500;font-size:15px;min-height:40px;padding:0 14px;border-radius:12px;border:1px solid rgba(255,255,255,.9);background:rgba(255,255,255,.88);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);color:var(--mintdk);box-shadow:0 3px 10px rgba(60,40,20,.18);cursor:pointer}
.bigb:hover{background:#fff}.bigb:focus-visible{outline:3px solid var(--mint);outline-offset:2px}
.bigctl{position:absolute;bottom:52px;left:50%;transform:translateX(-50%);z-index:3}
.bigctl .btn{box-shadow:0 6px 18px rgba(40,30,15,.25)}
.gleg{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;padding:2px 4px 0}
.gleg .lc{display:inline-flex;align-items:center;gap:4px;font-weight:500;font-size:15px;padding:2px 12px 2px 6px;border-radius:999px;background:color-mix(in srgb,var(--c) 12%,#fff);border:1px solid color-mix(in srgb,var(--c) 35%,#fff);color:#26304f}
.gleg .lc img{width:26px;height:26px}
.gleg .ly{font-size:14px;color:#4a5470;margin-inline-start:auto}
.gleg .lsrc{display:inline-flex;align-items:center;gap:4px;font-size:13px;color:#5b6585;background:#f1f4f8;border-radius:999px;padding:2px 10px}
.say{background:linear-gradient(160deg,#eef5ff,#e3eefb);box-shadow:0 2px 8px rgba(40,60,110,.08)}
img.av{width:52px;height:52px;border-radius:50%;object-fit:cover;background:#e3eefb;box-shadow:0 0 0 3px #fff,0 3px 8px rgba(40,60,110,.2);padding:0}
/* enlarged reality view */
body.big{overflow:hidden}
body.big .isl{position:fixed;inset:10px;z-index:60;aspect-ratio:auto;flex:none;height:auto;border-radius:18px;box-shadow:0 0 0 100vmax rgba(20,28,40,.55),0 20px 60px rgba(0,0,0,.4)}
body.big .side,body.big .grw,body.big .gleg{visibility:hidden}
body.big .gbub{font-size:19px;padding:10px 16px}
body.big .gbub b{font-size:14px}
body.big .yr{font-size:30px}
body.big .cc{font-size:17px}body.big .cc b{font-size:21px}body.big .cc img{width:32px;height:32px}
body.big .leg{display:block}
@media (max-width:980px){.isl{aspect-ratio:1.55/1}}
@media (max-width:560px){.gbub{font-size:13.5px;padding:5px 9px 6px;border-radius:12px 12px 3px 12px}.gbub b{font-size:11.5px}
  .bigb{min-height:36px;padding:0 10px;font-size:14px;top:8px;left:8px}.yr{top:8px;right:8px}
  .cc{padding:2px 9px 2px 5px}.cc img{width:22px;height:22px}.gleg .ly{display:none}.gleg .lc{font-size:14px}
  .isl{aspect-ratio:1.25/1}
  body.big .isl{inset:6px}body.big .gbub{font-size:16px}}
@media (orientation:portrait) and (max-width:560px){body.big .isl{inset:6px}}
@media (prefers-reduced-motion:reduce){.gbub.pop{animation:none}}
.proj .gbub{font-size:19px}
@media (orientation:portrait) and (max-width:760px){body.big .isl{inset:auto 6px;top:50%;transform:translateY(-50%);aspect-ratio:.82/1}}
@media (max-width:560px){body.big .leg{display:none}}