:root{--ink:#e8f4f2;--muted:#8499a0;--muted-2:#536a72;--line:rgba(145,190,191,.15);--line-strong:rgba(145,190,191,.27);--bg:#07151b;--panel:#0b2028;--panel-2:#0e2730;--teal:#62e1ca;--teal-deep:#1c9e98;--yellow:#f2ca74;--coral:#fa927e;--blue:#87bfff;--violet:#c3a4ff;--mono:'DM Mono',monospace;--sans:'Space Grotesk','Noto Sans SC',sans-serif;--shadow:0 24px 60px rgba(0,0,0,.3)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:14px}body{overflow-x:hidden}.is-hidden{display:none!important}.noise{position:fixed;inset:0;pointer-events:none;opacity:.025;z-index:20;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E")}.intro-screen{min-height:100vh;position:relative;overflow:hidden;display:grid;place-items:center;background:#07151b}.intro-screen:before{content:"";position:absolute;inset:0;background:linear-gradient(116deg,rgba(8,28,35,.94),rgba(7,21,27,.6) 55%,rgba(10,34,38,.92)),radial-gradient(circle at 70% 43%,rgba(62,166,153,.17),transparent 28%);}.intro-starfield{position:absolute;inset:0;overflow:hidden}.intro-starfield span{position:absolute;width:2px;height:2px;background:#b8eee3;border-radius:50%;opacity:.55;animation:twinkle 3.8s ease-in-out infinite}.intro-starfield span:nth-child(1){left:11%;top:20%;animation-delay:-1s}.intro-starfield span:nth-child(2){left:24%;top:73%;animation-delay:-2.4s}.intro-starfield span:nth-child(3){left:78%;top:19%;animation-delay:-.6s}.intro-starfield span:nth-child(4){left:83%;top:74%;animation-delay:-3s}.intro-starfield span:nth-child(5){left:61%;top:11%;animation-delay:-1.8s}.intro-starfield span:nth-child(6){left:42%;top:84%;animation-delay:-.3s}.intro-starfield span:nth-child(7){left:92%;top:47%;animation-delay:-2s}.intro-copy{position:relative;z-index:2;width:min(620px,calc(100% - 48px));margin-left:-38%;animation:fade-up 1.1s ease both}.eyebrow,.section-label,.panel-kicker,.stat-label,.formula-label{font-family:var(--mono);font-size:10px;letter-spacing:.15em;color:var(--muted);text-transform:uppercase}.eyebrow{display:flex;align-items:center;gap:9px;color:#98c7c2}.eyebrow-dot,.signal-dot,.live-dot{display:inline-block;border-radius:50%;background:var(--teal);box-shadow:0 0 0 4px rgba(98,225,202,.12),0 0 15px rgba(98,225,202,.65)}.eyebrow-dot{width:6px;height:6px}.intro-copy h1{font-size:clamp(64px,10vw,126px);line-height:.9;letter-spacing:-.055em;margin:27px 0 21px;font-weight:600}.intro-lead{font-size:18px;color:#b0c6c5;letter-spacing:.04em;margin:0 0 38px}.intro-sequence{display:flex;align-items:center;gap:13px;font-family:var(--mono);font-size:11px;color:var(--muted)}.intro-sequence i{width:14px;height:14px;color:#66838a}.intro-sequence .active{color:var(--teal)}.primary-button,.ghost-button,.icon-button,.nav-item{font-family:inherit;cursor:pointer;border:0;color:var(--ink)}button{font-family:inherit}.primary-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--teal);color:#05201f;border-radius:4px;padding:12px 18px;font-weight:600;font-size:13px;transition:transform .2s,box-shadow .2s,background .2s}.primary-button:hover{transform:translateY(-2px);box-shadow:0 9px 22px rgba(98,225,202,.2);background:#8ff1dd}.primary-button:disabled{opacity:.35;cursor:not-allowed;transform:none;box-shadow:none}.primary-button svg,.ghost-button svg,.icon-button svg,.nav-item svg{width:16px;height:16px}.intro-button{margin-top:38px;padding:14px 22px}.intro-molecule{position:absolute;z-index:1;right:10%;top:50%;width:min(480px,42vw);aspect-ratio:1;transform:translateY(-50%);animation:float 9s ease-in-out infinite}.intro-nucleus{position:absolute;inset:28%;display:flex;align-items:center;justify-content:center;gap:4%;filter:drop-shadow(0 0 25px rgba(98,225,202,.38))}.intro-nucleus b{display:grid;place-items:center;width:31%;aspect-ratio:1;border-radius:50%;font-size:clamp(18px,3vw,34px);font-weight:500}.intro-nucleus b:first-child,.intro-nucleus b:last-child{background:#18363d;border:1px solid rgba(135,191,255,.58);color:#a8d3ff}.intro-nucleus b:nth-child(2){background:#1d4b4a;border:1px solid rgba(98,225,202,.68);color:#b6fff0;transform:scale(1.23);z-index:2}.intro-orbit{position:absolute;border:1px solid rgba(116,223,207,.2);border-radius:50%;inset:7%;transform:rotate(58deg) scaleY(.47);animation:orbit-spin 17s linear infinite}.orbit-b{inset:13%;transform:rotate(-63deg) scaleY(.44);animation-direction:reverse;border-color:rgba(242,202,116,.21);animation-duration:23s}.intro-electron{position:absolute;width:11px;height:11px;border-radius:50%;background:var(--yellow);box-shadow:0 0 21px 4px rgba(242,202,116,.57)}.e1{left:19%;top:33%;animation:electron-a 7s linear infinite}.e2{right:15%;top:55%;background:var(--teal);box-shadow:0 0 21px 4px rgba(98,225,202,.57);animation:electron-b 9s linear infinite}.e3{left:48%;bottom:11%;background:var(--coral);box-shadow:0 0 21px 4px rgba(250,146,126,.45);animation:electron-c 8s linear infinite}.intro-caption{position:absolute;bottom:34px;right:54px;z-index:2;display:flex;gap:12px;align-items:center;font-family:var(--mono);font-size:10px;color:var(--muted)}.intro-caption strong{color:var(--teal);font-weight:400}.app-shell{min-height:100vh;background:#07151b}.topbar{height:72px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 30px;gap:36px;background:rgba(7,21,27,.92);position:relative;z-index:5}.brand-lockup{display:flex;align-items:center;gap:11px;min-width:185px}.brand-mark{display:flex;align-items:flex-end;gap:3px;width:22px;height:22px}.brand-mark span{display:block;width:5px;border-radius:3px;background:var(--teal)}.brand-mark span:nth-child(1){height:11px;opacity:.48}.brand-mark span:nth-child(2){height:19px}.brand-mark span:nth-child(3){height:15px;opacity:.72}.brand-name{font-size:15px;font-weight:600;letter-spacing:.06em}.brand-sub{font-family:var(--mono);color:var(--muted);font-size:8px;letter-spacing:.16em;margin-top:2px}.main-nav{display:flex;height:100%;gap:22px}.nav-item{background:transparent;color:var(--muted);display:flex;gap:8px;align-items:center;padding:0 5px;border-bottom:2px solid transparent;position:relative;font-size:13px}.nav-item.active{color:var(--ink);border-color:var(--teal)}.nav-item.active svg{color:var(--teal)}.top-actions{margin-left:auto;display:flex;align-items:center;gap:18px}.signal{font-family:var(--mono);font-size:9px;color:var(--muted);display:flex;gap:8px;align-items:center;letter-spacing:.08em}.signal-dot{width:5px;height:5px}.icon-button{display:grid;place-items:center;background:transparent;color:var(--muted);width:34px;height:34px;border-radius:4px;transition:color .2s,background .2s}.icon-button:hover{color:var(--ink);background:rgba(145,190,191,.1)}.avatar{display:grid;place-items:center;width:28px;height:28px;background:#16353a;border:1px solid var(--line-strong);color:var(--teal);font-family:var(--mono);font-size:10px;border-radius:50%}.workspace{display:grid;grid-template-columns:220px minmax(440px,1fr) 270px;min-height:calc(100vh - 72px)}.panel-edge{background:rgba(10,31,39,.76)}.levels-panel{border-right:1px solid var(--line);padding:27px 18px 16px;display:flex;flex-direction:column}.panel-kicker{display:flex;justify-content:space-between;color:#78949b;font-size:9px}.panel-kicker span{color:var(--muted-2)}.level-progress{height:2px;background:#1a343c;margin:15px 0 20px}.level-progress-fill{height:100%;background:var(--teal);width:10%;transition:width .3s}.level-list{display:flex;flex-direction:column;gap:4px}.level-item{border:1px solid transparent;background:transparent;color:var(--muted);padding:10px 10px;display:grid;grid-template-columns:26px 1fr auto;align-items:center;text-align:left;gap:7px;border-radius:3px;cursor:pointer;transition:background .2s,border .2s,color .2s}.level-item:hover{background:rgba(145,190,191,.07);color:var(--ink)}.level-item.active{background:#123038;border-color:rgba(98,225,202,.26);color:var(--ink)}.level-item.completed .level-number{color:var(--teal)}.level-number{font-family:var(--mono);font-size:10px;color:var(--muted-2)}.level-name{font-size:12px;font-weight:500}.level-formula{font-family:var(--mono);font-size:9px;color:var(--muted-2)}.level-item.active .level-formula{color:#85b3b2}.level-check{width:14px;height:14px;color:var(--teal)}.levels-footer{display:flex;gap:8px;align-items:flex-start;margin-top:auto;padding:15px 8px 0;border-top:1px solid var(--line);font-size:10px;color:var(--muted-2);line-height:1.5}.levels-footer svg{width:14px;flex:none;color:var(--teal-deep)}.lab-column{padding:28px 30px 22px;min-width:0;display:flex;flex-direction:column}.lab-heading{display:flex;justify-content:space-between;align-items:flex-end;margin:0 0 15px}.section-label{color:#77969b}.lab-heading h2{font-size:25px;letter-spacing:-.03em;margin:6px 0 0;font-weight:500}.heading-meta{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:11px;padding-bottom:3px}.live-dot{width:5px;height:5px}.experiment-stage{position:relative;min-height:500px;flex:1;border:1px solid var(--line-strong);border-radius:5px;background:#0a222b;overflow:hidden;isolation:isolate;box-shadow:var(--shadow)}.experiment-stage:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 47%,rgba(61,157,151,.1),transparent 34%),linear-gradient(125deg,rgba(5,16,23,.35),transparent 45%,rgba(12,51,55,.18));z-index:-1}.stage-grid{position:absolute;inset:0;opacity:.42;background-image:linear-gradient(rgba(107,157,160,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(107,157,160,.06) 1px,transparent 1px);background-size:54px 54px;mask-image:linear-gradient(to bottom,transparent,black 25%,black 75%,transparent)}.stage-grid:after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(175,233,219,.36) .75px,transparent .75px);background-size:31px 31px;opacity:.35}.stage-crosshair{position:absolute;width:20px;height:20px;border-color:rgba(98,225,202,.35);border-style:solid;opacity:.7}.crosshair-a{left:25px;top:25px;border-width:1px 0 0 1px}.crosshair-b{right:25px;bottom:25px;border-width:0 1px 1px 0}.stage-coordinates{position:absolute;left:25px;bottom:21px;display:flex;gap:16px;font-family:var(--mono);font-size:9px;color:var(--muted-2);letter-spacing:.05em}.stage-coordinates span:last-child{color:#527880}.stage-hint{position:absolute;top:20px;right:20px;display:flex;align-items:center;gap:7px;color:#709097;font-size:10px;opacity:.8;transition:opacity .3s}.stage-hint svg{width:13px;height:13px}.stage-hint.hidden{opacity:0}.bond-layer,.atom-layer{position:absolute;inset:0}.bond{position:absolute;height:3px;transform-origin:0 50%;background:rgba(98,225,202,.85);box-shadow:0 0 13px rgba(98,225,202,.5);border-radius:4px;z-index:1;pointer-events:none;animation:bond-in .55s cubic-bezier(.2,.9,.25,1.2) both}.bond:after{content:"";position:absolute;inset:-3px 0;background:rgba(98,225,202,.25);filter:blur(5px);border-radius:4px}.bond.double{height:2px;background:rgba(242,202,116,.85)}.bond.double:before{content:"";position:absolute;left:0;right:0;top:5px;height:2px;background:rgba(242,202,116,.56);box-shadow:0 0 9px rgba(242,202,116,.35);border-radius:4px}.atom{position:absolute;width:74px;height:74px;border-radius:50%;display:grid;place-items:center;cursor:grab;touch-action:none;user-select:none;z-index:2;transition:box-shadow .3s,transform .2s;animation:atom-float 6s ease-in-out infinite}.atom:active{cursor:grabbing;transform:scale(1.06);z-index:4}.atom.dragging{animation:none;box-shadow:0 0 0 1px rgba(255,255,255,.28),0 0 36px rgba(98,225,202,.44);transform:scale(1.06)}.atom-core{position:absolute;inset:10px;border-radius:50%;display:grid;place-items:center;border:1px solid currentColor;background:rgba(8,32,39,.88);box-shadow:inset 0 0 20px currentColor,0 0 18px rgba(0,0,0,.24)}.atom-symbol{position:relative;z-index:1;font-size:22px;font-weight:600;letter-spacing:-.06em}.atom-name{position:absolute;bottom:-19px;font-family:var(--mono);font-size:8px;letter-spacing:.1em;color:var(--muted);opacity:.9}.electron-ring{position:absolute;inset:0;border-radius:50%;pointer-events:none}.electron-dot{position:absolute;width:8px;height:8px;border-radius:50%;background:currentColor;box-shadow:0 0 12px 2px currentColor}.electron-slot{position:absolute;width:10px;height:10px;border:1px solid currentColor;border-radius:50%;background:rgba(7,21,27,.88);box-shadow:0 0 10px currentColor}.atom-h{color:var(--blue);width:68px;height:68px}.atom-h .electron-dot{right:4px;top:13px}.atom-o{color:var(--coral);width:82px;height:82px}.atom-o .electron-slot:nth-child(1){left:6px;top:22px}.atom-o .electron-slot:nth-child(2){right:6px;bottom:21px}.atom-c{color:var(--yellow);width:94px;height:94px}.atom-c .electron-slot:nth-child(1){top:1px;left:42px}.atom-c .electron-slot:nth-child(2){right:1px;top:42px}.atom-c .electron-slot:nth-child(3){bottom:1px;left:42px}.atom-c .electron-slot:nth-child(4){left:1px;top:42px}.atom-n{color:var(--violet);width:86px;height:86px}.atom-n .electron-slot:nth-child(1){top:3px;left:38px}.atom-n .electron-slot:nth-child(2){right:7px;bottom:17px}.atom-n .electron-slot:nth-child(3){left:7px;bottom:17px}.atom-f,.atom-cl{color:#7fe0a8}.atom-f .electron-slot,.atom-cl .electron-slot{right:5px;top:24px}.atom-cl{width:88px;height:88px}.atom-stable .atom-core{box-shadow:inset 0 0 24px currentColor,0 0 25px currentColor}.atom-stable .electron-slot{background:currentColor;box-shadow:0 0 12px currentColor}.lab-footer{display:flex;justify-content:space-between;align-items:center;padding-top:18px}.footer-stat{display:flex;align-items:center;gap:12px;min-width:220px}.stat-label{font-size:9px}.stability-track{height:5px;width:130px;background:#18333a;border-radius:5px;overflow:hidden}.stability-track div{height:100%;width:0;background:var(--teal);border-radius:5px;transition:width .35s cubic-bezier(.2,.8,.2,1);box-shadow:0 0 10px rgba(98,225,202,.6)}.footer-stat strong{font-family:var(--mono);font-size:11px;color:var(--teal);font-weight:400}.footer-actions{display:flex;gap:9px}.ghost-button{display:inline-flex;align-items:center;gap:8px;background:transparent;color:var(--muted);border:1px solid var(--line-strong);border-radius:4px;padding:10px 13px;font-size:12px;transition:all .2s}.ghost-button:hover{color:var(--ink);border-color:rgba(145,190,191,.48);background:rgba(145,190,191,.06)}.next-button{padding:10px 14px;font-size:12px}.inspector-panel{border-left:1px solid var(--line);padding:27px 19px 18px;display:flex;flex-direction:column}.inspector-header{display:flex;justify-content:space-between;align-items:center}.readout-status{font-family:var(--mono);font-size:9px;color:var(--muted);display:flex;gap:6px;align-items:center}.readout-status span{width:5px;height:5px;border-radius:50%;background:var(--yellow);box-shadow:0 0 9px var(--yellow)}.readout-status.ready{color:var(--teal)}.readout-status.ready span{background:var(--teal);box-shadow:0 0 9px var(--teal)}.formula-display{padding:27px 0 21px;border-bottom:1px solid var(--line)}.formula-label{display:block;margin-bottom:8px}.formula-display strong{font-size:44px;font-weight:500;letter-spacing:-.06em;color:#eaf6f2}.formula-underline{height:2px;background:var(--teal);width:26px;margin-top:16px;box-shadow:0 0 9px rgba(98,225,202,.5)}.atom-readouts{padding:20px 0;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:10px}.readout-row{display:grid;grid-template-columns:35px 1fr auto;align-items:center;gap:8px}.readout-symbol{font-size:13px;font-weight:600}.readout-name{color:var(--muted);font-size:11px}.readout-balance{font-family:var(--mono);font-size:10px;color:var(--muted)}.readout-balance.good{color:var(--teal)}.mini-bar{height:3px;background:#1a363d;grid-column:2/4;border-radius:3px;overflow:hidden;margin-top:-4px}.mini-bar div{height:100%;background:var(--teal);transition:width .35s}.rule-note{display:flex;gap:9px;margin:19px 0 0;padding:12px 11px;background:rgba(24,66,68,.33);border:1px solid rgba(98,225,202,.14);border-radius:3px}.rule-note svg{width:15px;height:15px;color:var(--yellow);flex:none;margin-top:1px}.rule-note strong{font-size:11px;font-weight:500}.rule-note p{font-size:10px;color:#89a9aa;line-height:1.5;margin:5px 0 0}.target-card{margin-top:auto;padding-top:19px;border-top:1px solid var(--line)}.target-card-top{display:flex;justify-content:space-between;align-items:center}.target-count{font-family:var(--mono);font-size:10px;color:var(--teal)}.target-card>strong{display:block;font-size:17px;font-weight:500;margin-top:10px}.target-card>p{font-size:11px;color:var(--muted);margin:6px 0 13px;line-height:1.45}.target-tags{display:flex;gap:5px;flex-wrap:wrap}.target-tags span{font-family:var(--mono);font-size:9px;color:#7faaa8;border:1px solid var(--line-strong);border-radius:2px;padding:4px 6px}.collection-view{padding:50px max(30px,6vw) 60px;max-width:1250px;margin:auto}.collection-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:34px}.collection-heading h2{font-size:36px;font-weight:500;letter-spacing:-.045em;margin:9px 0 7px}.collection-heading p{margin:0;color:var(--muted);font-size:13px}.collection-count{display:flex;align-items:baseline;gap:7px;color:var(--muted);font-family:var(--mono);font-size:10px}.collection-count strong{color:var(--teal);font-size:38px;font-weight:400;line-height:1}.collection-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(225px,1fr));gap:14px}.collection-card{min-height:230px;border:1px solid var(--line);background:#0b2028;padding:18px;position:relative;overflow:hidden;transition:transform .25s,border .25s}.collection-card:hover{transform:translateY(-3px);border-color:rgba(98,225,202,.4)}.collection-card.discovered{border-color:rgba(98,225,202,.24)}.collection-card.locked{opacity:.6}.collection-card .card-index{font-family:var(--mono);font-size:9px;color:var(--muted-2)}.collection-card .card-visual{height:92px;display:grid;place-items:center;position:relative}.card-visual .mini-atom{position:absolute;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#173a40;border:1px solid currentColor;font-size:10px;font-weight:600;box-shadow:0 0 18px currentColor}.card-visual .mini-bond{height:2px;background:rgba(98,225,202,.5);position:absolute;width:30px;transform-origin:center}.collection-card h3{font-size:16px;font-weight:500;margin:4px 0 3px}.collection-card .card-formula{font-family:var(--mono);color:var(--teal);font-size:11px}.collection-card p{font-size:10px;line-height:1.5;color:var(--muted);margin:12px 0 0}.locked-mark{position:absolute;right:15px;top:15px;color:var(--muted-2)}.locked-mark svg{width:13px}.discovery-modal{position:fixed;inset:0;z-index:30;display:grid;place-items:center;padding:20px}.modal-backdrop{position:absolute;inset:0;background:rgba(1,10,14,.78);backdrop-filter:blur(8px)}.discovery-card{position:relative;z-index:1;width:min(480px,100%);background:#0c252d;border:1px solid rgba(98,225,202,.35);box-shadow:0 35px 100px rgba(0,0,0,.55);padding:29px 30px 26px;animation:modal-in .5s cubic-bezier(.16,.9,.2,1.15)}.modal-close{position:absolute;right:14px;top:14px}.discovery-overline{display:flex;align-items:center;gap:9px;font-family:var(--mono);font-size:9px;color:var(--teal);letter-spacing:.08em}.discovery-icon{display:grid;place-items:center;width:24px;height:24px;border:1px solid rgba(98,225,202,.4);border-radius:50%}.discovery-icon svg{width:13px}.discovery-visual{height:145px;margin:16px 0 15px;position:relative;display:grid;place-items:center}.discovery-visual .visual-atom{position:absolute;width:53px;height:53px;border-radius:50%;display:grid;place-items:center;background:#13343c;border:1px solid currentColor;font-size:15px;font-weight:600;box-shadow:0 0 25px currentColor}.discovery-visual .visual-bond{position:absolute;width:57px;height:3px;background:rgba(98,225,202,.76);box-shadow:0 0 12px rgba(98,225,202,.6);transform-origin:center}.discovery-copy .section-label{margin-bottom:7px}.discovery-copy h2{font-size:30px;font-weight:500;letter-spacing:-.04em;margin:0}.discovery-formula{font-family:var(--mono);font-size:14px;color:var(--teal);margin-top:5px}.discovery-copy p{font-size:12px;line-height:1.65;color:#9cb5b5;margin:17px 0 16px}.discovery-fact{display:flex;gap:14px;border-top:1px solid var(--line);padding-top:13px;font-size:11px;color:var(--muted)}.discovery-fact strong{font-weight:400;color:#c5d8d3}.full-button{width:100%;margin-top:23px}.toast{position:fixed;left:50%;bottom:27px;transform:translate(-50%,20px);z-index:50;display:flex;align-items:center;gap:8px;padding:10px 14px;background:#16343a;border:1px solid rgba(98,225,202,.3);color:#b6d1cf;border-radius:3px;font-size:11px;opacity:0;pointer-events:none;transition:all .25s}.toast.visible{opacity:1;transform:translate(-50%,0)}.toast svg{width:14px;color:var(--teal)}
@keyframes twinkle{0%,100%{opacity:.25;transform:scale(.7)}50%{opacity:.8;transform:scale(1.35)}}@keyframes fade-up{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes float{0%,100%{transform:translateY(-50%) translate(0,0)}50%{transform:translateY(-50%) translate(0,-14px)}}@keyframes orbit-spin{to{transform:rotate(418deg) scaleY(.47)}}@keyframes electron-a{to{transform:translate(130px,120px)}}@keyframes electron-b{to{transform:translate(-140px,-60px)}}@keyframes electron-c{to{transform:translate(80px,-110px)}}@keyframes atom-float{0%,100%{margin-top:0;transform:rotate(0)}50%{margin-top:-7px;transform:rotate(2deg)}}@keyframes bond-in{from{opacity:0;transform:scaleX(0) rotate(var(--angle))}to{opacity:1;transform:scaleX(1) rotate(var(--angle))}}@keyframes modal-in{from{opacity:0;transform:translateY(20px) scale(.97)}to{opacity:1;transform:none}}@media(max-width:1100px){.workspace{grid-template-columns:190px minmax(400px,1fr) 245px}.lab-column{padding-left:20px;padding-right:20px}.topbar{padding:0 20px}}@media(max-width:840px){.workspace{grid-template-columns:1fr;display:block}.levels-panel{border-right:0;border-bottom:1px solid var(--line);padding:15px 20px}.level-list{display:grid;grid-template-columns:repeat(5,1fr);gap:4px}.level-item{grid-template-columns:1fr;justify-items:center;padding:8px 2px}.level-item .level-name,.level-item .level-formula,.levels-footer{display:none}.level-number{font-size:10px}.level-check{position:absolute;margin-left:24px;margin-top:-11px}.lab-column{padding:20px}.experiment-stage{min-height:470px}.inspector-panel{border-left:0;border-top:1px solid var(--line);padding:22px 20px;display:grid;grid-template-columns:1fr 1fr;gap:20px}.inspector-header,.formula-display,.rule-note,.target-card{grid-column:1/3}.atom-readouts{border-bottom:0;padding:0}.target-card{margin-top:0}.intro-copy{margin-left:0;width:min(520px,calc(100% - 48px));text-align:center}.intro-copy .eyebrow,.intro-sequence{justify-content:center}.intro-molecule{opacity:.35;right:-15%;width:450px}.intro-caption{right:20px;bottom:18px}}@media(max-width:560px){.topbar{height:62px;padding:0 14px;gap:12px}.brand-lockup{min-width:auto}.brand-sub,.signal{display:none}.main-nav{gap:6px}.nav-item{font-size:11px;padding:0 4px}.top-actions{gap:4px}.workspace{min-height:calc(100vh - 62px)}.level-list{grid-template-columns:repeat(5,1fr)}.lab-column{padding:16px 12px}.lab-heading{align-items:flex-start}.lab-heading h2{font-size:20px}.heading-meta{font-size:9px;max-width:105px;text-align:right}.experiment-stage{min-height:390px}.stage-coordinates{left:14px;bottom:12px;font-size:8px}.stage-coordinates span:first-child{display:none}.stage-hint{top:13px;right:13px;font-size:9px}.atom{transform:scale(.82)}.atom:active,.atom.dragging{transform:scale(.89)}.lab-footer{align-items:flex-start;gap:15px;flex-direction:column}.footer-stat{width:100%;justify-content:space-between}.stability-track{flex:1}.footer-actions{width:100%}.footer-actions button{flex:1}.inspector-panel{display:block}.atom-readouts{padding:18px 0;border-bottom:1px solid var(--line)}.target-card{margin-top:20px}.collection-view{padding:28px 16px}.collection-heading{align-items:flex-start;gap:18px;flex-direction:column;margin-bottom:22px}.collection-heading h2{font-size:30px}.collection-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.collection-card{min-height:205px;padding:13px}.collection-card .card-visual{height:75px}.collection-card p{font-size:9px}.discovery-card{padding:24px 20px}.intro-copy h1{font-size:68px}.intro-lead{font-size:15px}}
@keyframes burst{0%{opacity:0;transform:scale(.4)}30%{opacity:1}100%{opacity:0;transform:scale(1.7)}}
.intro-screen.leaving{animation:intro-out .65s ease forwards}
.success-burst{position:absolute;inset:0;display:grid;place-items:center;pointer-events:none;opacity:0}
.success-burst.active{opacity:1}
.success-burst span{position:absolute;width:90px;height:90px;border:1px solid rgba(98,225,202,.8);border-radius:50%;animation:burst .9s ease-out both}
.success-burst span:nth-child(2){width:150px;height:150px;animation-delay:.09s;border-color:rgba(242,202,116,.6)}
.success-burst span:nth-child(3){width:230px;height:230px;animation-delay:.16s;border-color:rgba(98,225,202,.4)}
.success-burst span:nth-child(4){width:320px;height:320px;animation-delay:.22s;border-color:rgba(135,191,255,.25)}
@keyframes intro-out{to{opacity:0;transform:scale(1.025)}}

/* Casual puzzle pass: softer paper, clearer level path, and a playful touch target. */
.app-shell{--app-ink:#21434a;--app-muted:#779094;--app-line:#d8ebe4;--app-line-strong:#bddbd3;--app-panel:#ffffff;--app-mint:#59cdb5;--app-coral:#f58b79;--app-yellow:#f6c965;background:#eef8f4;color:var(--app-ink)}
.app-shell .topbar{height:68px;background:#fff;border-bottom:1px solid var(--app-line);box-shadow:0 3px 16px rgba(53,106,101,.08);color:var(--app-ink)}
.app-shell .brand-name{color:#1e4148}.app-shell .brand-sub,.app-shell .nav-item,.app-shell .signal{color:var(--app-muted)}.app-shell .nav-item.active{color:var(--app-ink);border-color:var(--app-coral)}.app-shell .nav-item.active svg{color:var(--app-coral)}.app-shell .signal-dot{background:var(--app-mint);box-shadow:0 0 0 4px rgba(89,205,181,.12),0 0 13px rgba(89,205,181,.42)}.app-shell .avatar{background:#fff5d9;border-color:#f0d890;color:#9c7620}
.app-shell .workspace{background:#eef8f4}.app-shell .panel-edge{background:transparent}.app-shell .levels-panel{border-right:0;padding:24px 14px 14px}.app-shell .levels-panel .panel-kicker{color:#78969a;padding:0 6px}.app-shell .level-progress{height:7px;border-radius:10px;background:#dcefe9;margin:12px 6px 17px}.app-shell .level-progress-fill{background:var(--app-coral);border-radius:10px;box-shadow:0 2px 8px rgba(245,139,121,.28)}
.app-shell .level-list{gap:7px}.app-shell .level-item{min-height:47px;background:rgba(255,255,255,.65);border:1px solid transparent;border-radius:8px;color:#6c8588;padding:8px 10px;box-shadow:0 2px 6px rgba(41,106,99,.03);transition:transform .2s,background .2s,border .2s,box-shadow .2s}.app-shell .level-item:hover{background:#fff;color:var(--app-ink);transform:translateX(2px)}.app-shell .level-item.active{background:#fff;border-color:#f2c978;color:var(--app-ink);box-shadow:0 5px 14px rgba(208,165,67,.14);transform:translateX(3px)}.app-shell .level-item.locked{background:rgba(255,255,255,.34);color:#a1b5b5;cursor:not-allowed;box-shadow:none}.app-shell .level-item.locked:hover{transform:none}.app-shell .level-number{color:#9bb0af}.app-shell .level-item.active .level-number{color:#c38d1a}.app-shell .level-item.completed .level-number{color:#39ad98}.app-shell .level-formula{color:#91a7a6}.app-shell .level-check{color:#43bd9e}.app-shell .level-lock{width:13px;color:#a9bdbb}.app-shell .levels-footer{color:#8da7a5;border-top-color:var(--app-line)}
.app-shell .lab-column{padding:24px 23px 20px}.app-shell .section-label,.app-shell .panel-kicker{color:#78979a}.app-shell .lab-heading h2{font-size:27px;color:#21434a}.app-shell .heading-meta{color:#739092}.app-shell .live-dot{background:var(--app-mint);box-shadow:0 0 0 4px rgba(89,205,181,.14),0 0 10px rgba(89,205,181,.45)}
.app-shell .experiment-stage{min-height:500px;border:1px solid #cfe6de;border-radius:8px;background:#f9fffc;box-shadow:0 12px 30px rgba(44,105,99,.11)}.app-shell .experiment-stage:before{background:radial-gradient(circle at 50% 45%,rgba(89,205,181,.1),transparent 34%),linear-gradient(125deg,rgba(255,255,255,.5),transparent 55%,rgba(246,201,105,.06))}.app-shell .stage-grid{opacity:.55;background-image:linear-gradient(rgba(105,173,159,.1) 1px,transparent 1px),linear-gradient(90deg,rgba(105,173,159,.1) 1px,transparent 1px);mask-image:linear-gradient(to bottom,transparent,black 15%,black 85%,transparent)}.app-shell .stage-grid:after{background-image:radial-gradient(rgba(71,152,137,.3) .75px,transparent .75px)}.app-shell .stage-crosshair,.app-shell .stage-coordinates{display:none}.app-shell .stage-hint{top:17px;right:18px;padding:8px 10px;border-radius:20px;background:#ecf8f3;color:#6a9590;opacity:1}.app-shell .stage-hint.hidden{opacity:0;transform:translateY(-5px)}
.app-shell .bond-pair{position:absolute;width:40px;height:40px;z-index:1;pointer-events:none;animation:pair-in .45s cubic-bezier(.2,.85,.25,1.2) both}.app-shell .electron-pair{position:absolute;left:50%;top:50%;display:flex;gap:5px;transform:translate(-50%,-50%);padding:4px 5px;border:1px solid rgba(238,176,57,.55);border-radius:20px;background:rgba(255,249,218,.78);box-shadow:0 3px 10px rgba(223,166,46,.2)}.app-shell .electron-pair:nth-child(2){transform:translate(-50%,-50%) translateY(12px)}.app-shell .electron-pair i{width:8px;height:8px;border-radius:50%;background:#f4bb4d;box-shadow:0 0 8px 2px rgba(246,188,74,.8);animation:shared-pulse 1.8s ease-in-out infinite}.app-shell .electron-pair i:nth-child(2){background:#ff977d;box-shadow:0 0 8px 2px rgba(245,139,121,.58);animation-delay:-.7s}.app-shell .double-pair .electron-pair{padding-inline:4px}
.app-shell .atom{transition:box-shadow .25s,filter .25s;filter:saturate(.96)}.app-shell .atom-core{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:2px;background:#fff;box-shadow:inset 0 0 14px currentColor,0 4px 12px rgba(38,91,87,.15);border-width:2px}.app-shell .atom-symbol{font-size:23px;line-height:1;color:currentColor}.app-shell .atom-name{position:static;display:block;line-height:1;color:currentColor;opacity:.74;font-family:var(--sans);font-size:10px;letter-spacing:0}.app-shell .electron-ring{animation:orbit-electrons 6.5s linear infinite;transform-origin:50% 50%}.app-shell .atom:nth-child(3n) .electron-ring{animation-duration:8.3s;animation-direction:reverse}.app-shell .atom:nth-child(4n) .electron-ring{animation-duration:5.4s}.app-shell .atom.dragging,.app-shell .atom.group-dragging{filter:saturate(1.18) brightness(1.05)}.app-shell .atom.splitting{animation:split-charge .22s ease-in-out infinite alternate;filter:saturate(1.3) brightness(1.08);z-index:5}.app-shell .atom-stable .atom-core{box-shadow:inset 0 0 17px currentColor,0 5px 16px rgba(38,91,87,.14)}
.app-shell .lab-footer{padding-top:16px}.app-shell .stability-track{height:8px;background:#d9eee8;border-radius:10px}.app-shell .stability-track div{background:var(--app-mint);box-shadow:0 0 10px rgba(89,205,181,.45)}.app-shell .footer-stat strong{color:#35aa92}.app-shell .ghost-button{border-color:#c3ddd6;background:#fff;color:#668285;border-radius:8px}.app-shell .ghost-button:hover{border-color:#a8d1c7;background:#f6fcf9;color:var(--app-ink)}.app-shell .primary-button{background:var(--app-coral);color:#fff;border-radius:8px;box-shadow:0 5px 12px rgba(245,139,121,.2)}.app-shell .primary-button:hover{background:#f17b68;box-shadow:0 8px 16px rgba(245,139,121,.25)}.app-shell .next-button{background:#f6c965;color:#6f5415;box-shadow:0 5px 12px rgba(246,201,101,.22)}.app-shell .next-button:hover{background:#f2bd47}
.app-shell .inspector-panel{border-left:1px solid var(--app-line);background:rgba(255,255,255,.68);padding:24px 17px 18px}.app-shell .formula-display{border-color:var(--app-line);padding:23px 0 18px}.app-shell .formula-display strong{color:#21434a}.app-shell .formula-underline{background:var(--app-coral);box-shadow:none;border-radius:3px}.app-shell .atom-readouts{border-color:var(--app-line)}.app-shell .readout-name{color:#789092}.app-shell .readout-balance{color:#94aaa8}.app-shell .readout-balance.good{color:#35aa92}.app-shell .mini-bar{background:#dcefe9}.app-shell .mini-bar div{background:var(--app-mint)}.app-shell .rule-note{background:#fff8df;border-color:#f4df99}.app-shell .rule-note svg{color:#d59d21}.app-shell .rule-note p{color:#8b7d58}.app-shell .target-card{border-color:var(--app-line)}.app-shell .target-tags span{border-color:#c5ded7;background:#fff;color:#6e8b8b;border-radius:5px}.app-shell .target-count{color:#35aa92}
.app-shell .collection-view{padding-top:42px}.app-shell .collection-card{border-color:#d3e8e1;border-radius:8px;background:#fff;box-shadow:0 6px 16px rgba(41,106,99,.06)}.app-shell .collection-card:hover{border-color:#f0cf78;box-shadow:0 9px 20px rgba(41,106,99,.1)}.app-shell .collection-card .card-formula{color:#35aa92}.app-shell .collection-card p{color:#789092}
@keyframes orbit-electrons{to{transform:rotate(360deg)}}@keyframes shared-pulse{0%,100%{transform:scale(.85);opacity:.76}50%{transform:scale(1.15);opacity:1}}@keyframes pair-in{from{opacity:0;transform:scale(.2)}to{opacity:1;transform:scale(1)}}@keyframes split-charge{from{transform:scale(1.04) rotate(-2deg)}to{transform:scale(1.09) rotate(2deg)}}
@media(max-width:840px){.app-shell .topbar{height:64px}.app-shell .levels-panel{padding:12px 14px 10px}.app-shell .level-item{min-height:44px}.app-shell .lab-column{padding:17px 14px}.app-shell .inspector-panel{background:rgba(255,255,255,.72)}}
@media(max-width:560px){.app-shell .lab-heading h2{font-size:22px}.app-shell .experiment-stage{min-height:410px}.app-shell .atom-core{box-shadow:inset 0 0 11px currentColor,0 3px 8px rgba(38,91,87,.13)}.app-shell .stage-hint{font-size:9px}.app-shell .levels-panel{padding-inline:9px}.app-shell .level-item{border-radius:7px}.app-shell .footer-actions button{border-radius:8px}}
 .app-shell .level-item .level-check,.app-shell .level-item .level-lock{grid-column:3;grid-row:1;justify-self:end;margin:0}
 .app-shell .electron-pair{padding:0;border:0;background:transparent;box-shadow:none;gap:4px}
 .app-shell .electron-pair i{width:8px;height:8px}
.visual-bond{display:none!important}.visual-shared-pair{position:absolute;width:24px;height:24px;display:grid;place-items:center;z-index:3;pointer-events:none;animation:shared-pop .42s cubic-bezier(.2,.9,.2,1.2) both}.visual-electron-set{display:flex;gap:4px;align-items:center;justify-content:center}.visual-electron-set:nth-child(2){margin-top:7px}.visual-electron-set i{display:block;width:7px;height:7px;border-radius:50%;background:#f4bb4d;box-shadow:0 0 8px 2px rgba(246,188,74,.72);animation:shared-pulse 1.8s ease-in-out infinite}.visual-electron-set i:nth-child(2){background:#ff977d;box-shadow:0 0 8px 2px rgba(245,139,121,.55);animation-delay:-.7s}.double-shared{height:30px}@keyframes shared-pop{from{opacity:0;transform:scale(.2)}to{opacity:1;transform:scale(1)}}
.app-shell .synthesize-button{background:var(--app-mint);color:#124b43;box-shadow:0 5px 12px rgba(89,205,181,.22)}.app-shell .synthesize-button:hover{background:#47bda6}.app-shell .synthesize-button:disabled{background:#d9eee8;color:#91aaa5;box-shadow:none}.unknown-naming{display:flex;flex-direction:column;gap:7px;margin-top:16px}.unknown-naming label{font-size:11px;color:#9ab5b5}.unknown-naming input{width:100%;border:1px solid rgba(98,225,202,.32);border-radius:5px;background:rgba(255,255,255,.05);color:#e8f4f2;padding:9px 10px;font:inherit;outline:none}.unknown-naming input:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(98,225,202,.12)}.app-shell .unknown-naming input{background:#fff;border-color:#cfe6de;color:#21434a}.app-shell .unknown-naming label{color:#789092}

/* Covalent electron regions: fixed width along A-B, growing only perpendicular to A-B. */
.app-shell .bond-pair{
  width:28px;
  height:17px;
  transform:translate(-50%,-50%) rotate(var(--bond-angle,0rad));
  transform-origin:center;
  animation:bond-region-in .45s cubic-bezier(.2,.85,.25,1.2) both;
}
.app-shell .bond-pair .electron-pair{
  position:absolute;
  left:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  width:24px;
  height:12px;
  gap:4px;
  padding:0;
  border:0;
  border-radius:0;
  background:transparent;
  box-shadow:none;
  transform:translate(-50%,-50%) !important;
}
.app-shell .bond-pair .electron-pair i{width:8px;height:8px;flex:0 0 8px}

.app-shell .visual-shared-pair{
  width:26px;
  transform:rotate(var(--bond-angle,0rad));
  transform-origin:center;
  animation:visual-region-in .42s cubic-bezier(.2,.9,.2,1.2) both;
}
.app-shell .visual-shared-pair .visual-electron-set{
  position:absolute;
  left:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  width:24px;
  height:12px;
  gap:4px;
  margin:0 !important;
  transform:translate(-50%,-50%);
}
.app-shell .visual-shared-pair .visual-electron-set i{width:7px;height:7px;flex:0 0 7px}
@keyframes bond-region-in{from{opacity:0;transform:translate(-50%,-50%) rotate(var(--bond-angle,0rad)) scale(.25)}to{opacity:1;transform:translate(-50%,-50%) rotate(var(--bond-angle,0rad)) scale(1)}}
@keyframes visual-region-in{from{opacity:0;transform:rotate(var(--bond-angle,0rad)) scale(.25)}to{opacity:1;transform:rotate(var(--bond-angle,0rad)) scale(1)}}

.discovery-fact span{flex:none;white-space:nowrap}
.discovery-fact strong{line-height:1.6}

/* Keep the atom's outer coordinate as its true center; the idle motion happens inside it. */
.app-shell .atom{
  margin:0 !important;
  --atom-scale:1;
  transform:translate(-50%,-50%);
  animation:atom-brownian 8.7s cubic-bezier(.45,.05,.55,.95) infinite;
}
.app-shell .atom:nth-child(3n+1){animation-duration:9.8s;animation-delay:-2.3s}
.app-shell .atom:nth-child(3n+2){animation-duration:8.1s;animation-delay:-5.1s;animation-direction:reverse}
.app-shell .atom:nth-child(3n){animation-duration:10.6s;animation-delay:-3.7s}
.app-shell .atom.dragging,.app-shell .atom.group-dragging{
  animation:none;
  transform:translate(-50%,-50%) scale(1.06);
}
.app-shell .atom.dragging.split-charging,
.app-shell .atom.group-dragging.split-charging{
  animation:split-charge-ramp 1.5s linear both;
  transform:translate(-50%,-50%) scale(var(--charge-scale,1.06));
  filter:saturate(1.2) brightness(1.06);
  z-index:5;
}
.app-shell .atom.group-dragging.split-charging:not(.dragging){animation-name:split-charge-ramp-linked}
.app-shell .atom.splitting{animation:split-charge-centered .22s ease-in-out infinite alternate}
.app-shell .atom.splitting:not(.dragging){animation-name:split-charge-linked;animation-duration:.19s}
.app-shell .atom-core{animation:atom-core-breathe 7.9s ease-in-out infinite}
.app-shell .atom.dragging .atom-core,.app-shell .atom.group-dragging .atom-core,.app-shell .atom.splitting .atom-core{animation:none}
@keyframes atom-brownian{
  0%,100%{transform:translate(-50%,-50%) translate(0,0) scale(var(--atom-scale)) rotate(-.25deg)}
  13%{transform:translate(-50%,-50%) translate(1.4px,-2px) scale(var(--atom-scale)) rotate(.45deg)}
  31%{transform:translate(-50%,-50%) translate(-1.4px,-3.2px) scale(var(--atom-scale)) rotate(-.7deg)}
  48%{transform:translate(-50%,-50%) translate(-2.6px,0) scale(var(--atom-scale)) rotate(.15deg)}
  67%{transform:translate(-50%,-50%) translate(.7px,2.6px) scale(var(--atom-scale)) rotate(.65deg)}
  82%{transform:translate(-50%,-50%) translate(2.6px,-.7px) scale(var(--atom-scale)) rotate(-.4deg)}
}
@keyframes atom-core-breathe{0%,100%{transform:scale(1)}24%{transform:scale(1.018)}61%{transform:scale(.992)}82%{transform:scale(1.012)}}
@keyframes split-charge-ramp{
  0%,12%{transform:translate(-50%,-50%) translate(0,0) scale(var(--charge-scale,1.06)) rotate(0)}
  20%{transform:translate(-50%,-50%) translate(.2px,-.1px) scale(var(--charge-scale,1.06)) rotate(.12deg)}
  29%{transform:translate(-50%,-50%) translate(-.35px,.15px) scale(var(--charge-scale,1.06)) rotate(-.2deg)}
  39%{transform:translate(-50%,-50%) translate(.6px,-.25px) scale(var(--charge-scale,1.06)) rotate(.35deg)}
  50%{transform:translate(-50%,-50%) translate(-.9px,.4px) scale(var(--charge-scale,1.06)) rotate(-.5deg)}
  61%{transform:translate(-50%,-50%) translate(1.25px,-.55px) scale(var(--charge-scale,1.06)) rotate(.7deg)}
  72%{transform:translate(-50%,-50%) translate(-1.65px,.7px) scale(var(--charge-scale,1.06)) rotate(-.9deg)}
  82%{transform:translate(-50%,-50%) translate(2.1px,-.85px) scale(var(--charge-scale,1.06)) rotate(1.1deg)}
  91%{transform:translate(-50%,-50%) translate(-2.5px,1px) scale(var(--charge-scale,1.06)) rotate(-1.3deg)}
  100%{transform:translate(-50%,-50%) translate(2.9px,-1.15px) scale(var(--charge-scale,1.06)) rotate(1.5deg)}
}
@keyframes split-charge-ramp-linked{
  0%,12%{transform:translate(-50%,-50%) translate(0,0) scale(var(--charge-scale,1.06)) rotate(0)}
  20%{transform:translate(-50%,-50%) translate(-.2px,.1px) scale(var(--charge-scale,1.06)) rotate(-.12deg)}
  29%{transform:translate(-50%,-50%) translate(.35px,-.15px) scale(var(--charge-scale,1.06)) rotate(.2deg)}
  39%{transform:translate(-50%,-50%) translate(-.6px,.25px) scale(var(--charge-scale,1.06)) rotate(-.35deg)}
  50%{transform:translate(-50%,-50%) translate(.9px,-.4px) scale(var(--charge-scale,1.06)) rotate(.5deg)}
  61%{transform:translate(-50%,-50%) translate(-1.25px,.55px) scale(var(--charge-scale,1.06)) rotate(-.7deg)}
  72%{transform:translate(-50%,-50%) translate(1.65px,-.7px) scale(var(--charge-scale,1.06)) rotate(.9deg)}
  82%{transform:translate(-50%,-50%) translate(-2.1px,.85px) scale(var(--charge-scale,1.06)) rotate(-1.1deg)}
  91%{transform:translate(-50%,-50%) translate(2.5px,-1px) scale(var(--charge-scale,1.06)) rotate(1.3deg)}
  100%{transform:translate(-50%,-50%) translate(-2.9px,1.15px) scale(var(--charge-scale,1.06)) rotate(-1.5deg)}
}
@keyframes split-charge-centered{from{transform:translate(-50%,-50%) translate(-2px,1px) scale(var(--charge-scale,1.06)) rotate(-2deg)}to{transform:translate(-50%,-50%) translate(2px,-1px) scale(var(--charge-scale,1.06)) rotate(2deg)}}
@keyframes split-charge-linked{from{transform:translate(-50%,-50%) translate(2px,-1px) scale(var(--charge-scale,1.06)) rotate(2deg)}to{transform:translate(-50%,-50%) translate(-2px,1px) scale(var(--charge-scale,1.06)) rotate(-2deg)}}
@media(max-width:560px){
  .app-shell .atom{--atom-scale:.82;--charge-scale:.89;transform:translate(-50%,-50%) scale(.82);animation-name:atom-brownian}
  .app-shell .atom.dragging,.app-shell .atom.group-dragging{transform:translate(-50%,-50%) scale(.89)}
}

/* One atom/electron visual language is shared by the lab, result, and collection. */
.atom-visual .atom-core{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:2px;background:#fff;box-shadow:inset 0 0 14px currentColor,0 4px 12px rgba(38,91,87,.15);border-width:2px}
.atom-visual .atom-symbol{font-size:23px;line-height:1;color:currentColor}
.atom-visual .atom-name{position:static;display:block;line-height:1;color:currentColor;opacity:.74;font-family:var(--sans);font-size:10px;letter-spacing:0}
.atom-visual .electron-ring{animation:orbit-electrons 6.5s linear infinite;transform-origin:50% 50%}
.atom-visual.atom-stable .atom-core{box-shadow:inset 0 0 17px currentColor,0 5px 16px rgba(38,91,87,.14)}

.bond-pair{position:absolute;width:28px;height:17px;z-index:1;pointer-events:none;transform:translate(-50%,-50%) rotate(var(--bond-angle,0rad));transform-origin:center;animation:bond-region-in .45s cubic-bezier(.2,.85,.25,1.2) both}
.bond-pair .electron-pair{position:absolute;left:50%;display:flex;align-items:center;justify-content:center;width:24px;height:12px;gap:4px;padding:0;border:0;border-radius:0;background:transparent;box-shadow:none;transform:translate(-50%,-50%)!important}
.bond-pair .electron-pair i{width:8px;height:8px;flex:0 0 8px;border-radius:50%;color:var(--bond-electron-a,#f4bb4d);background:currentColor;box-shadow:0 0 8px 2px currentColor;animation:shared-pulse 1.8s ease-in-out infinite}
.bond-pair .electron-pair i:nth-child(2){color:var(--bond-electron-b,#ff977d);background:currentColor;box-shadow:0 0 8px 2px currentColor;animation-delay:-.7s}

.molecule-model{position:relative;overflow:hidden}
.molecule-model .molecule-atom{margin:0!important;cursor:default;touch-action:auto;transition:none;animation:none;transform:translate(-50%,-50%) scale(var(--molecule-scale,1));transform-origin:center}
.molecule-model .molecule-atom:active{transform:translate(-50%,-50%) scale(var(--molecule-scale,1))}
.molecule-model .molecule-atom .atom-core{animation:none}
.molecule-model .molecule-bond{animation:none;transform:translate(-50%,-50%) rotate(var(--bond-angle,0rad)) scale(var(--molecule-scale,1))}

/* Level selection is a dedicated view; the lab only contains the active experiment. */
.app-shell .levels-view{min-height:calc(100vh - 68px);padding:46px max(24px,6vw) 38px;background:#eef8f4}
.levels-view-inner{width:min(1080px,100%);margin:0 auto}
.levels-view-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:22px}
.levels-view-heading h1{margin:7px 0 8px;font-size:36px;font-weight:500;line-height:1.1;color:#21434a}
.levels-view-heading p{margin:0;color:#779094;font-size:13px}
.level-summary{display:flex;align-items:baseline;gap:7px;flex:none;color:#779094;font-family:var(--mono);font-size:10px}
.level-summary strong{color:#f58b79;font-size:38px;font-weight:400;line-height:1}
.levels-view .level-progress{height:7px;margin:0 0 24px;border-radius:10px;background:#dcefe9;overflow:hidden}
.levels-view .level-progress-fill{height:100%;border-radius:10px;background:#f58b79;box-shadow:0 2px 8px rgba(245,139,121,.28)}
.levels-view .level-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.levels-view .level-item{position:relative;display:grid;grid-template-columns:44px minmax(0,1fr) auto;grid-template-rows:1fr auto;gap:12px 15px;align-items:start;min-height:116px;padding:18px;text-align:left;border:1px solid #d3e8e1;border-radius:8px;background:#fff;color:#21434a;box-shadow:0 5px 15px rgba(41,106,99,.05);transition:transform .2s,border-color .2s,box-shadow .2s}
.levels-view .level-item:not(.locked):hover{transform:translateY(-2px);border-color:#efc96d;box-shadow:0 9px 20px rgba(41,106,99,.09)}
.levels-view .level-item.active{border-color:#efc96d;background:#fff;box-shadow:0 8px 20px rgba(208,165,67,.12);transform:none}
.levels-view .level-item.locked{cursor:not-allowed;background:rgba(255,255,255,.5);color:#9bafaf;box-shadow:none}
.levels-view .level-number{grid-column:1;grid-row:1/3;display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:#ecf8f3;color:#55aa9b;font-size:12px}
.levels-view .level-item.active .level-number{background:#fff4d7;color:#b48118}
.levels-view .level-item.locked .level-number{background:#edf3f0;color:#a9b8b6}
.levels-view .level-copy{grid-column:2;grid-row:1;display:flex;min-width:0;flex-direction:column;gap:5px}
.levels-view .level-name{display:block;font-size:17px;font-weight:600;line-height:1.2}
.levels-view .level-subtitle{overflow:hidden;color:#789092;font-size:11px;line-height:1.4;text-overflow:ellipsis;white-space:nowrap}
.levels-view .level-formula{display:block;grid-column:3;grid-row:1;color:#35aa92;font-family:var(--mono);font-size:16px}
.levels-view .level-item.locked .level-formula{color:#9eb2af}
.levels-view .level-state{grid-column:2/4;grid-row:2;display:flex;align-items:center;justify-content:flex-end;gap:6px;color:#789092;font-size:10px}
.levels-view .level-state svg{width:13px;height:13px}
.levels-view .level-item:not(.locked) .level-state{color:#35aa92}
.levels-view .levels-footer{display:flex;justify-content:center;margin-top:25px;padding:0;border:0;color:#789092}
.levels-view .levels-footer svg{color:#59cdb5}
.app-shell .levels-view .level-state .level-check,.app-shell .levels-view .level-state .level-lock{position:static;grid-column:auto;grid-row:auto;justify-self:auto;margin:0}

.app-shell .workspace{grid-template-columns:minmax(0,1fr);min-height:calc(100vh - 68px)}
.lab-heading-main{display:flex;align-items:flex-start;gap:12px;min-width:0}
.lab-title-stack{min-width:0}
.app-shell .back-to-levels{width:36px;height:36px;flex:none;border:1px solid #c3ddd6;background:#fff;color:#668285;border-radius:8px}
.app-shell .back-to-levels:hover{border-color:#a8d1c7;background:#f6fcf9;color:#21434a}
.app-shell .inspector-panel{justify-content:flex-start;padding-top:31px}
.app-shell .inspector-panel .atom-readouts{padding:0 0 20px;border-bottom:1px solid var(--app-line)}
.app-shell .inspector-panel .rule-note{margin-top:18px}

@media(max-width:840px){
  .app-shell .levels-view{min-height:calc(100vh - 64px);padding:34px 22px 30px}
  .app-shell .workspace{display:block;min-height:calc(100vh - 64px)}
  .app-shell .inspector-panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,1fr);gap:18px;border-top:1px solid var(--app-line);border-left:0;padding:20px 14px}
  .app-shell .inspector-panel .atom-readouts{padding:0;border:0}
  .app-shell .inspector-panel .rule-note{margin:0}
}
@media(max-width:620px){
  .levels-view-heading{align-items:flex-start;margin-bottom:18px}
  .levels-view-heading h1{font-size:30px}
  .levels-view-heading p{max-width:250px;font-size:11px;line-height:1.5}
  .level-summary{flex-wrap:wrap;justify-content:flex-end;width:64px}
  .level-summary strong{font-size:31px}
  .levels-view .level-list{grid-template-columns:1fr;gap:9px}
  .levels-view .level-item{min-height:106px;padding:15px}
}
@media(max-width:560px){
  .app-shell .levels-view{min-height:calc(100vh - 62px);padding:27px 14px 24px}
  .app-shell .inspector-panel{display:block;padding:18px 14px}
  .app-shell .inspector-panel .atom-readouts{padding-bottom:17px;border-bottom:1px solid var(--app-line)}
  .app-shell .inspector-panel .rule-note{margin-top:15px}
  .lab-heading-main{gap:9px}
  .app-shell .back-to-levels{width:34px;height:34px}
}

/* Electron accounting: the dots show the atom's original outer-shell electrons;
   the compact counter shows the current shared-electron progress. */
.atom .electron-status{
  position:absolute;
  top:-15px;
  left:50%;
  z-index:5;
  transform:translateX(-50%);
  min-width:32px;
  padding:3px 6px;
  border:1px solid rgba(79,139,130,.28);
  border-radius:999px;
  background:rgba(255,255,255,.94);
  color:#779092;
  font:500 10px/1 var(--mono);
  text-align:center;
  box-shadow:0 3px 7px rgba(41,106,99,.08);
  pointer-events:none;
}
.atom .electron-status.good{color:#24977f;border-color:#9fd7c8;background:#effbf5}
.atom .electron-ring{z-index:3;overflow:visible}
.atom .electron-dot{position:absolute;display:block;width:8px;height:8px;border-radius:50%;background:currentColor;box-shadow:0 0 11px 2px currentColor;}
.atom-core{z-index:2}
.app-shell .bond-pair{pointer-events:auto;cursor:pointer}
.molecule-model .electron-status{top:-9px;min-width:20px;padding:2px 3px;font-size:7px;}
.empty-collection{grid-column:1/-1;margin:0;padding:32px;color:#789092;font-size:12px;text-align:center}

/* Keep the workspace frame fixed while scaling the interactive scene inside it. */
.stage-scene{position:absolute;inset:0;z-index:2;scale:var(--stage-zoom,1);transform-origin:50% 50%;transition:scale .2s ease}
.stage-scene .bond-layer{z-index:4;pointer-events:none}
.stage-scene .atom-layer{z-index:3}
.stage-scene .bond-pair{z-index:5;pointer-events:auto}
.stage-scene .bond-pair.drag-updating{animation:none}
.stage-hint,.stage-coordinates{z-index:5}
.stage-zoom-controls{position:static;display:flex;align-items:center;gap:8px;width:max-content;margin-top:9px;padding:5px 8px;border:1px solid #c3ddd6;border-radius:6px;background:#f6fcf9;box-shadow:none}
.stage-zoom-controls button{display:grid;place-items:center;width:25px;height:25px;padding:0;border:0;border-radius:4px;background:transparent;color:#668285;cursor:pointer}
.stage-zoom-controls button:hover{background:#ecf8f3;color:#21434a}
.stage-zoom-controls button svg{width:14px;height:14px}
.stage-zoom-controls input{width:150px;height:4px;accent-color:#62e1ca;cursor:pointer}
.stage-zoom-controls span{min-width:35px;color:#668285;font:500 10px/1 var(--mono);text-align:right}
.molecule-model{overflow:visible}
.app-shell .electron-ring{animation:electron-orbit 16s linear infinite;transform-origin:50% 50%}
.molecule-model .electron-ring{animation-duration:20s}
@keyframes electron-orbit{to{transform:rotate(360deg)}}

/* Keep the electron counter inside the atom, directly above its symbol. */
.atom .electron-status{top:0;min-width:30px;padding:2px 4px;border-radius:4px;font-size:9px;line-height:1}
.molecule-model .electron-status{top:1px;min-width:24px;padding:1px 3px;border-radius:3px;font-size:7px}
.atom .electron-status.complete,.molecule-model .electron-status{display:none}

@media(max-width:560px){
  .stage-zoom-controls{gap:6px;padding:5px 7px}
  .stage-zoom-controls input{width:105px}
}

/* Align every level to one scan line, then keep the active hint beside its title. */
.levels-view .level-list{grid-template-columns:1fr;gap:8px}
.levels-view .level-item{
  grid-template-columns:44px minmax(132px,180px) minmax(0,1fr) 84px 72px;
  grid-template-rows:auto;
  min-height:76px;
  gap:16px;
  align-items:center;
  justify-items:stretch;
  padding:15px 18px;
}
.levels-view .level-number{grid-column:1;grid-row:1;justify-self:center}
.levels-view .level-copy{display:contents}
.levels-view .level-name{grid-column:2;grid-row:1;min-width:0;margin:0;padding:0}
.levels-view .level-subtitle{grid-column:3;grid-row:1;min-width:0;margin:0;padding:0}
.levels-view .level-formula{grid-column:4;grid-row:1;text-align:right}
.levels-view .level-state{grid-column:5;grid-row:1;justify-content:flex-end;white-space:nowrap}

.lab-heading{display:grid;grid-template-columns:minmax(0,1fr);gap:10px;align-items:stretch;margin-bottom:15px}
.lab-heading-main{align-items:center}
.lab-title-stack{flex:1}
.lab-title-row{display:flex;align-items:baseline;gap:16px;min-width:0}
.lab-heading .lab-title-row h2{flex:none;max-width:45%;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lab-title-row .heading-meta{flex:1;min-width:0;max-width:none;padding:0;text-align:left}
.lab-title-row .heading-meta span:last-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lab-heading .stage-zoom-controls{width:100%;margin:0}
.lab-heading .stage-zoom-controls input{flex:1;min-width:0;width:auto}

@media(max-width:620px){
  .levels-view .level-item{grid-template-columns:40px minmax(0,1fr) auto;grid-template-rows:auto auto;min-height:94px;gap:7px 12px;padding:14px}
  .levels-view .level-number{grid-column:1;grid-row:1/3}
  .levels-view .level-copy{grid-column:2;grid-row:1;display:flex;gap:5px}
  .levels-view .level-formula{grid-column:3;grid-row:1}
  .levels-view .level-state{grid-column:2/4;grid-row:2}
  .lab-title-row{gap:8px}
  .lab-heading .lab-title-row h2{max-width:48%}
  .lab-title-row .heading-meta{flex:1 1 0}
}

/* Keep mobile browsers from adding their own long-press feedback before split mode is ready. */
.stage-scene .atom{
  -webkit-touch-callout:none;
  -webkit-user-select:none;
  user-select:none;
  -webkit-tap-highlight-color:transparent;
}

/* Collection details: quiet cards, a dedicated molecule viewport, and readable science notes. */
.levels-view-heading h1,.collection-heading h2{margin-top:0}
.collection-card[type="button"]{width:100%;appearance:none;color:#21434a;font:inherit;text-align:left;cursor:pointer}
.collection-card[type="button"]:focus-visible{outline:3px solid rgba(89,205,181,.35);outline-offset:2px;border-color:#59cdb5}
.collection-card-open{position:absolute;top:14px;right:14px;display:grid;place-items:center;width:28px;height:28px;border:1px solid #d3e8e1;border-radius:6px;background:#f5fbf8;color:#6e918d;transition:color .2s,border-color .2s,background .2s}
.collection-card-open svg{width:14px;height:14px}
.collection-card[type="button"]:hover .collection-card-open{border-color:#efc96d;background:#fff8df;color:#aa7b17}

.discovery-modal{color:#21434a}
.discovery-modal .modal-backdrop{background:rgba(15,42,47,.56);backdrop-filter:blur(7px)}
.discovery-card{width:min(520px,100%);max-height:calc(100vh - 32px);overflow-y:auto;padding:26px 28px 24px;border:1px solid #cfe6de;border-radius:8px;background:#fff;color:#21434a;box-shadow:0 28px 80px rgba(22,67,67,.28)}
.discovery-card .modal-close{position:absolute;top:12px;right:12px;z-index:4;border:1px solid #d3e8e1;background:#fff;color:#6e898a}
.discovery-card .modal-close:hover{border-color:#efc96d;background:#fff8df;color:#8c691a}
.discovery-visual{position:relative;display:block;height:180px;margin:10px 0 15px;overflow:hidden;border:1px solid #dceee8;border-radius:7px;background:#f7fcfa}
.discovery-model{position:absolute;inset:0;transform:scale(var(--detail-zoom,1));transform-origin:50% 50%;transition:transform .18s ease}
.discovery-model.molecule-model{overflow:visible}
.discovery-copy h2{margin:0;color:#21434a;font-size:30px;font-weight:600;letter-spacing:0}
.discovery-formula{margin-top:5px;color:#35aa92;font-size:14px}
.discovery-copy p{margin:15px 0;color:#668285;font-size:12px;line-height:1.7}
.discovery-fact{display:grid;grid-template-columns:auto minmax(0,1fr);gap:14px;padding-top:14px;border-top:1px solid #dcebe7;color:#789092;font-size:11px}
.discovery-fact strong{color:#355b60;font-weight:500;line-height:1.65}
.discovery-card .unknown-naming label{color:#789092}
.discovery-card .unknown-naming input{border-color:#cfe6de;background:#fff;color:#21434a}
.discovery-card .full-button{margin-top:20px;border-radius:7px;background:#59cdb5;color:#164a43}
.discovery-zoom-controls{display:flex;align-items:center;gap:8px;margin:0 0 17px;padding:6px 8px;border:1px solid #d3e8e1;border-radius:7px;background:#f7fcfa}
.discovery-zoom-controls .icon-button{width:32px;height:32px;flex:none;color:#668285}
.discovery-zoom-controls .icon-button:hover{background:#e8f6f1;color:#21434a}
.discovery-zoom-controls input{min-width:0;flex:1;height:4px;accent-color:#59cdb5;cursor:pointer}
.discovery-zoom-controls span{min-width:40px;color:#668285;font:500 10px/1 var(--mono);text-align:right}
.discovery-modal.collection-detail .discovery-card{width:min(680px,100%)}
.discovery-modal.collection-detail .discovery-visual{height:260px;margin-top:7px}

@media(max-width:560px){
  .discovery-modal{padding:10px}
  .discovery-card{max-height:calc(100vh - 20px);padding:20px 16px 18px}
  .discovery-card .modal-close{top:8px;right:8px}
  .discovery-modal.collection-detail .discovery-visual{height:220px;margin-top:12px}
  .discovery-copy h2{font-size:25px}
  .discovery-zoom-controls{gap:5px;padding:5px 6px}
}