@import url('./elements-experiments.css');
:root{color-scheme:dark;--bg:#08111f;--panel:#101e31;--panel2:#14263c;--line:#2a3d55;--ink:#edf4ff;--muted:#a5b7ce;--mint:#78edca;--gold:#ffdb93;--violet:#bbafff;--radius:18px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:14px}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 80% 0,#172640 0,transparent 45%),var(--bg);color:var(--ink);line-height:1.55}button,input,select,textarea{font:inherit}button,select,.button-link{min-height:36px;border:1px solid var(--line);border-radius:9px;background:#142338;color:var(--ink);padding:7px 11px}button{cursor:pointer}button:hover,.button-link:hover{border-color:var(--mint);background:#193348}button:disabled{opacity:.5;cursor:default}button[aria-pressed=true],button[aria-selected=true]{border-color:var(--mint);background:#173b3c;color:#a4ffe3}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible,canvas:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #ffe5a3;outline-offset:3px}input[type=range]{accent-color:var(--mint);width:100%;min-width:0;min-height:32px;cursor:pointer}input[type=search],input[type=number],textarea{background:#0c1828;border:1px solid var(--line);border-radius:8px;color:var(--ink);padding:9px 11px;min-width:0}textarea{width:100%;resize:vertical}input[type=radio],input[type=checkbox]{accent-color:var(--mint)}a{color:#99dfef;text-underline-offset:3px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:31px;letter-spacing:-1.1px;line-height:1.15;margin:0}h2{font-size:22px;line-height:1.25;margin-bottom:10px}h3{font-size:18px;line-height:1.35;margin-bottom:12px}h4{font-size:16px;line-height:1.3;margin-bottom:8px}p{margin-bottom:12px}small,.quiet,.model-note{color:var(--muted)}.quiet{font-size:13px}.model-note{font-size:12px;line-height:1.5;margin:10px 0}.eyebrow,.mini-label{font-size:10px;font-weight:750;letter-spacing:1.2px;color:var(--mint);text-transform:uppercase;margin-bottom:5px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}.skip{position:fixed;top:-80px;left:12px;background:var(--gold);color:#07111d;padding:12px;z-index:200}.skip:focus{top:8px}.site-header{height:58px;display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:1600px;padding:0 28px;margin:auto;border-bottom:1px solid #1f3146}.brand{display:flex;gap:7px;align-items:center;text-decoration:none;color:var(--ink)}.brand strong{font-size:18px;letter-spacing:-.5px}.brand span{font-size:9px;letter-spacing:1.4px;color:var(--mint);border-left:1px solid var(--line);padding-left:8px;margin-left:3px}.site-header nav{display:flex;gap:10px;align-items:center;font-size:12px}.site-header nav>a{text-decoration:none}.site-header nav button{min-height:30px;padding:3px 9px;background:transparent}.site-header select{font-size:12px;padding:4px;min-height:30px}main{max-width:1600px;margin:auto;padding:0 28px 28px}.hero{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:22px 0 17px}.hero h1 em{font-style:normal;font-size:15px;letter-spacing:0;font-weight:400;color:var(--muted);display:inline-block;margin-left:12px}.hero-actions{display:flex;align-items:end;gap:8px}.hero-actions label{font-size:10px;color:var(--muted)}.hero-actions select{display:block;font-size:12px;min-height:32px;padding:4px 8px}.hero-actions button{font-size:12px;min-height:32px}.workspace-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;padding:5px;background:#0b1727;border:1px solid var(--line);border-radius:12px;margin-bottom:20px;position:sticky;top:0;z-index:20;box-shadow:0 8px 18px #08111f77}.workspace-tabs button{border-color:transparent;background:transparent;border-radius:7px;font-size:13px;font-weight:650;display:flex;gap:8px;justify-content:center;align-items:center;padding:9px}.workspace-tabs button[aria-selected=true]{background:#19333e;color:#9cf0d4;border-color:#36594e}.workspace-tabs button>span:first-child{font-size:19px;line-height:1}.count{font-size:10px;background:#244738;border-radius:20px;padding:1px 6px}.curiosity-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.curiosity-heading h2{font-size:14px;font-weight:600;margin-bottom:8px}.curiosity-heading>span{font-size:11px;color:var(--muted)}.object-launchers{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-bottom:17px}.object-launchers button{text-align:left;display:flex;align-items:center;gap:10px;background:linear-gradient(130deg,#18314a,#111d30);padding:10px 12px;min-height:57px}.object-launchers .object-icon{display:flex;align-items:center;justify-content:center;background:#233d54;border:1px solid #32516b;border-radius:12px;width:32px;height:32px;flex-shrink:0;color:var(--gold);font-size:22px}.object-launchers strong{font-size:12px;font-weight:600}.object-launchers small{display:block;font-size:10px;line-height:1.25}.explore-toolbar{display:flex;align-items:end;gap:10px;margin-bottom:12px}.explore-toolbar>label:not(.search-label){font-size:10px;color:var(--muted)}.explore-toolbar select{display:block;min-height:36px;max-width:200px}.search-label{display:flex;align-items:center;gap:4px;flex:1;background:#0c1828;border:1px solid var(--line);border-radius:9px;padding-left:10px}.search-label>span{font-size:23px;color:var(--mint)}.search-label input{border:0;background:transparent;width:100%;min-height:37px;outline-offset:-2px}.segmented{display:flex;gap:3px}.segmented button{font-size:11px;padding:7px 9px}.explore-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:16px;align-items:start}.table-panel,.element-panel,.world-card,.inquiry-card,.builder-play,.cosmic-panel,.origin-story{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(145deg,#142338,#101c2d);padding:16px;min-width:0}.table-topline{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11px;color:var(--muted);min-height:30px;margin-bottom:8px}.table-topline p{margin:0}.table-topline label{display:flex;gap:8px;align-items:center}.table-topline input{width:90px}.table-topline button{font-size:10px;min-height:26px;padding:2px 6px}.table-scroll{overflow:auto;padding:3px 3px 10px;perspective:1100px;scrollbar-color:#49657b #0a1625}.periodic-table{display:grid;grid-template-columns:repeat(18,minmax(34px,1fr));grid-template-rows:17px repeat(7,48px) 9px repeat(2,48px);gap:4px;min-width:700px;transform-origin:center center;transition:transform .25s}.periodic-table.is-depth{transform:rotateX(11deg) rotateY(var(--tilt,-8deg));padding:4px 0 8px}.periodic-table .element-cell{position:relative;background:var(--cell-bg);border:1px solid var(--cell-border);color:var(--cell-color);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;border-radius:5px;min-width:0;padding:3px 1px;min-height:0;font-size:8px;line-height:1.2;transition:filter .12s,transform .12s;box-shadow:0 2px 5px #0003}.element-cell .cell-z{position:absolute;left:4px;top:3px;font-size:7px}.element-cell .cell-symbol{font-size:17px;font-weight:750;margin-top:7px;letter-spacing:-.5px}.element-cell .cell-name{font-size:6px;max-width:95%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.element-cell.selected{outline:2px solid #fff4cf;outline-offset:1px;z-index:2;filter:brightness(1.18)}.element-cell.is-filtered{opacity:.13;filter:grayscale(.7)}.element-cell:hover{transform:translateY(-3px);filter:brightness(1.3);z-index:3}.group-number{align-self:center;text-align:center;font-size:9px;color:#8199b5}.block-label{font-size:9px;align-self:center;text-align:center;color:var(--muted)}.table-footer{display:flex;justify-content:space-between;font-size:10px;color:var(--muted);padding:5px 0 10px}.legend{display:flex;gap:5px;flex-wrap:wrap;border-top:1px solid #283c51;padding-top:12px}.legend button{font-size:9px;min-height:27px;background:#0e1b2b;padding:4px 7px;display:flex;align-items:center;gap:5px}.legend i{width:7px;height:7px;display:inline-block;border-radius:2px;background:var(--legend-color)}.legend button[aria-pressed=true]{border-color:var(--mint)}.table-panel .model-note{font-size:10px;margin-bottom:0}.periodic-table.is-cards{grid-template-columns:repeat(5,minmax(0,1fr));grid-template-rows:none;grid-auto-rows:80px;min-width:0;transform:none;gap:8px}.is-cards .element-cell{grid-column:auto!important;grid-row:auto!important}.is-cards .group-number,.is-cards .block-label{display:none}.is-cards .cell-symbol{font-size:24px}.is-cards .cell-name{font-size:10px}.is-cards .cell-z{font-size:9px;top:5px;left:7px}.is-cards .is-filtered{display:none}.table-scroll:has(.is-cards){max-height:560px}.element-heading{display:flex;align-items:center;gap:12px}.element-heading>div:nth-child(2){flex:1;min-width:0}.element-heading h2{font-size:23px;margin:0;overflow-wrap:anywhere}.element-heading>div>span{color:var(--muted);font-size:10px}.element-heading .eyebrow{font-size:8px;letter-spacing:.8px}.element-symbol{display:flex;flex-direction:column;justify-content:center;align-items:center;width:58px;height:65px;border:1px solid;border-radius:10px;flex-shrink:0}.element-symbol small{color:inherit;font-size:10px;align-self:flex-start;padding-left:8px}.element-symbol strong{font-size:30px;line-height:1}.element-heading>button{padding:3px 8px;min-height:28px}.atom-stage,.builder-stage,.world-stage,.cosmic-stage{position:relative;overflow:hidden;background:radial-gradient(ellipse at center,#183347,#0b1729 75%);border-radius:12px}.atom-stage{height:170px;margin:12px 0 7px}.atom-stage canvas,.builder-stage canvas,.world-stage canvas,.cosmic-stage canvas{width:100%;height:100%;display:block;touch-action:pan-y;cursor:grab}.scene-tools{position:absolute;right:8px;top:8px;display:flex;gap:3px;z-index:2}.scene-tools button{width:29px;height:29px;min-height:0;line-height:1;font-size:15px;background:#0a1627d9;padding:3px;color:#d5e8ef}.atom-controls{justify-content:space-between}.atom-controls button{font-size:10px;padding:5px 7px;min-height:28px}.particle-counts{display:flex;gap:8px;justify-content:space-between;color:var(--muted);font-size:10px;margin-top:12px}.particle-counts b{color:var(--ink);font-size:12px}.element-use{font-size:12px;margin-top:12px}.origin-badges{display:flex;flex-wrap:wrap;gap:5px;margin:8px 0}.origin-badges button{color:var(--origin-color);border-color:var(--origin-color);background:#0b1929;font-size:9px;padding:4px 7px;min-height:26px}.inspector-actions{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.inspector-actions button{font-size:11px;flex:1}.primary-button{background:var(--mint);color:#082722;border-color:var(--mint);font-weight:700}.primary-button:hover{color:#082722;background:#a8ffe4}.element-detail{margin-top:14px;font-size:12px}.element-detail summary{cursor:pointer;color:var(--muted)}dl{margin:10px 0}dl>div{display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid #26384d;padding:7px 0}dt{color:var(--muted)}dd{margin:0;text-align:right}.text-button{border:0;background:transparent;padding:5px 1px;min-height:28px;color:#a9d9dc;font-size:11px}#narrateElement{margin-top:7px}.investigation-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}.investigation-heading h2{font-size:17px;margin:0}.context-pill{font-size:11px;color:#b8eadd;background:#163332;padding:5px 10px;border-radius:20px;margin:0}.experiment-tools{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin:14px 0}.experiment-tools button{display:flex;align-items:center;justify-content:center;gap:6px;font-size:12px;min-height:45px}.experiment-tools button>span{font-size:19px;color:var(--mint)}.matter-layout,.builder-layout,.origins-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(280px,1fr);gap:16px;align-items:start}.world-topline{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.world-topline select{font-weight:600}.world-topline button{font-size:11px;min-height:30px}.schematic-label{font-size:9px;letter-spacing:.7px;color:#9cafc5}.world-card h3{font-size:19px;margin-bottom:12px}.world-stage{height:300px}.scale-controls{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:10px}.scale-controls button{font-size:11px;min-height:40px;padding:6px}.scale-controls span{border:1px solid #456376;border-radius:50%;width:18px;height:18px;font-size:9px;display:inline-flex;justify-content:center;align-items:center;margin-right:5px}.world-options{display:flex;gap:20px;align-items:center;margin-top:15px}.world-options>label{flex:1;font-size:11px;color:var(--muted)}.world-options select{display:block;width:100%;margin-top:5px}.world-card>.quiet{font-size:12px}.world-card .inspector-actions a{flex:1;font-size:11px;align-self:center;text-align:center}.inquiry-card>label{display:block;font-size:12px;margin:12px 0 6px}.inquiry-card>button{margin-top:9px;margin-right:4px;font-size:12px}.inquiry-card h3{font-size:20px}.inquiry-card>p{font-size:12px}.inquiry-card fieldset{padding:12px 0 0;border:0;margin:8px 0}.inquiry-card legend{font-size:12px;font-weight:650;margin-bottom:6px}.choice{display:flex;align-items:start;gap:7px;margin:7px 0;font-size:12px}.choice input{margin:4px 0 0;flex-shrink:0}.feedback{background:#0e2b33;border:1px solid #2b5053;border-radius:9px;padding:10px 12px;color:#c5eddf;font-size:12px;min-height:38px;margin-top:12px}.feedback:empty{display:none}.builder-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.builder-header h3{font-size:17px;margin:0}.builder-header button{font-size:11px}.builder-play{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:14px 20px}.builder-visual{min-width:0}.builder-result{display:flex;align-items:center;gap:12px;min-height:63px}.builder-result h4{font-size:18px;margin:0}.builder-result p{font-size:11px;color:var(--muted);margin:3px 0}.isotope-notation{display:flex;align-items:center;font-size:36px;color:var(--gold)}.isotope-notation>span{display:flex;flex-direction:column;font-size:14px;line-height:1.4;margin-right:4px}.isotope-notation>sup{font-size:14px;align-self:start;margin-top:4px}.builder-stage{height:230px}.particle-control{padding:11px 0;border-bottom:1px solid var(--line)}.particle-control label{display:flex;justify-content:space-between;font-size:13px;font-weight:600}.particle-control output{font-size:18px;color:var(--mint);line-height:1.2}.builder-controls>button{width:100%;font-size:12px;margin-top:10px}.builder-equations{font-size:11px;color:var(--muted);margin-top:13px}.builder-equations p{display:flex;justify-content:space-between;gap:8px;margin:4px 0}.builder-equations strong{font-size:14px;color:var(--ink)}.builder-play>.feedback,.builder-play>.model-note{grid-column:1/-1;margin:0}.inquiry-card>select{width:100%}#builderSteps{padding:0;list-style:none;counter-reset:steps}#builderSteps li{padding:10px 10px 10px 38px;border-left:2px solid var(--line);position:relative;margin:6px 0;font-size:12px;background:#0e1b2a;border-radius:0 7px 7px 0}#builderSteps li:before{counter-increment:steps;content:counter(steps);position:absolute;left:10px;color:var(--muted)}#builderSteps li.active{border-color:var(--mint);background:#16343a}#builderSteps li.done{border-color:#5ca588;color:#a2cbb9}#builderSteps li.done:before{content:'✓';color:var(--mint)}.section-intro{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:16px}.section-intro h2{font-size:22px}.section-intro p{font-size:13px;color:var(--muted);margin-bottom:0}.section-intro button{font-size:12px}.context-banner{padding:9px 13px;background:#183139;border-left:3px solid var(--mint);border-radius:7px;font-size:12px;line-height:1.5}.context-banner.is-unrelated{border-color:var(--gold);background:#302b28;color:#f3dfba}.origin-menu{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-bottom:16px}.origin-menu button{display:flex;align-items:center;gap:10px;text-align:left;border-left:3px solid var(--origin-color);font-size:11px;padding:7px 11px;min-height:39px}.origin-menu button>span{font-size:21px;color:var(--origin-color)}.cosmic-title{display:flex;align-items:center;justify-content:space-between;gap:12px}.cosmic-title h3{margin-bottom:10px;font-size:19px}.cosmic-stage{height:280px}.cosmic-step{display:flex;align-items:start;gap:12px;margin-top:13px;min-height:76px}.cosmic-step>span{font-size:11px;color:var(--gold);white-space:nowrap;padding-top:3px}.cosmic-step p{font-size:13px;margin:0}.stage-controls{display:flex;gap:8px;align-items:center;margin:8px 0 14px}.stage-controls>label{flex:1}.stage-controls>button{min-height:32px;font-size:11px;padding:5px 9px}#originBlurb{font-size:13px;color:var(--muted)}.origin-examples>div{display:flex;gap:5px;flex-wrap:wrap;margin-top:7px}.origin-examples button{min-height:27px;min-width:32px;font-size:11px;padding:3px 6px}.stellar-scenarios{margin-top:18px;border-top:1px solid var(--line);padding-top:12px;font-size:12px}.stellar-scenarios summary{font-weight:650;color:#bdd8e7;cursor:pointer}.stellar-scenarios label{display:block;font-size:11px;margin-top:12px}.stellar-scenarios select{max-width:100%;margin:6px 0 12px;font-size:12px}.stellar-scenarios button{font-size:12px}.story-title{display:flex;align-items:center;gap:12px}.story-title>span{font-size:35px;color:var(--gold)}.story-title h3{margin:0;font-size:18px}#elementStory{font-size:13px;margin:15px 0}.reaction-card{border-top:1px solid var(--line);padding-top:15px;margin-top:15px}.reaction-card h4{margin:4px 0 10px}.reaction-equation{display:flex;flex-wrap:wrap;align-items:center;gap:6px;background:#0b182a;padding:13px 9px;border-radius:10px;font-size:15px;color:#ffe0a2}.nuclide{display:inline-flex;align-items:center;gap:2px;font-weight:650}.nuclide>span{display:inline-flex;flex-direction:column;font-size:8px;line-height:1.2}.nuclide .multiplicity{font-size:12px;margin-right:3px}.ledger{font-size:11px}.ledger dd{font-weight:650}.reaction-card>label{display:block;font-size:12px;margin:14px 0 7px}.reaction-card select{width:100%;font-size:12px;white-space:normal}.reaction-card>button{margin-top:10px;font-size:12px}.process-note{font-size:12px;margin:15px 0;color:var(--muted)}.process-note summary{color:#bdd8e7;cursor:pointer}.process-note p{margin-top:10px}#originEvidence{font-size:12px;width:100%}.notebook-actions{display:flex;flex-wrap:wrap;gap:6px}.notebook-summary{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}.notebook-summary span{background:#15363a;padding:8px 13px;border:1px solid #305358;border-radius:10px;color:#b5f1d7;font-size:12px}#notebookEntries{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.notebook-entry{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px}.notebook-entry h3{font-size:19px;margin-bottom:5px}.notebook-entry>small{font-size:10px}.notebook-entry dt{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--mint);margin-top:13px}.notebook-entry dd{font-size:13px;text-align:left;margin-top:3px;white-space:pre-wrap;overflow-wrap:anywhere}.notebook-entry label{display:block;font-size:11px;margin:12px 0 6px}.notebook-entry .entry-actions{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.entry-actions button{font-size:11px}.notebook-empty{text-align:center;padding:70px 20px;border:1px dashed var(--line);border-radius:var(--radius);background:#122036}.notebook-empty p{color:var(--muted);max-width:600px;margin:0 auto 20px}.science-details{margin-top:28px;border:1px solid var(--line);border-radius:12px;background:#0f1c2d;padding:14px 18px}.science-details summary{font-size:12px;color:#b5c7db;cursor:pointer}.science-content{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:20px}.science-content h3{font-size:16px}.science-content p,.science-content li{font-size:12px;color:var(--muted)}.science-content ul{padding-left:18px}.science-content li{margin:6px 0}.button-link{display:inline-block;font-size:12px;text-decoration:none}footer{display:flex;gap:15px;align-items:center;justify-content:space-between;font-size:11px;max-width:1600px;margin:auto;padding:0 28px 25px;color:var(--muted)}footer p{margin:0}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#c1ffe7;border:1px solid #7ce9b8;color:#10372c;padding:12px 20px;box-shadow:0 8px 30px #0007;border-radius:12px;max-width:min(90vw,600px);z-index:150;font-size:13px}.empty-state{padding:45px 18px;text-align:center;color:var(--muted)}dialog{background:#122338;color:var(--ink);border:1px solid #486078;border-radius:18px;width:min(650px,94vw);max-height:85vh;padding:24px}dialog::backdrop{background:#020713cc;backdrop-filter:blur(4px)}.dialog-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px}.dialog-heading h2{margin:0}.dialog-heading button{font-size:23px;min-height:33px;padding:0 10px}dialog p,dialog li{font-size:13px;color:var(--muted)}.help-steps{padding-left:23px}.help-steps li{margin:14px 0}#glossaryList dt{font-size:14px;color:var(--mint);font-weight:650;margin:14px 0 4px}#glossaryList dd{text-align:left;font-size:13px;color:var(--muted)}.compare-table{width:100%;border-collapse:collapse;font-size:12px}.compare-table th,.compare-table td{padding:11px 8px;text-align:left;border-bottom:1px solid var(--line)}.compare-table th{color:var(--mint)}.compare-table th:first-child{width:35%}.noscript{padding:25px;border:2px solid var(--gold);background:#30291d;color:var(--ink);margin:20px}.learning-note{font-size:12px;color:var(--muted)}body[data-level=start] .advanced-only{display:none}body[data-level=advanced] .advanced-only{display:block}
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@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
/* Leave room for the sticky workspace tabs when moving keyboard focus. */
html{scroll-padding-block-start:76px}
main :is(button,input,select,textarea,summary,canvas,[tabindex]),main [role=tabpanel]{scroll-margin-block-start:8px}
.mobile-element-bar{display:none}
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/* Phone controls stay beside their models, with larger touch hit areas. */
@media screen and (max-width:760px){
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}
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