:root{--paper:#f4f7f9;--white:#fff;--ink:#172c3c;--muted:#657789;--line:#e0e7ed;--blue:#2763e7;--mint:#59d9bd;--apricot:#ffae79;--lilac:#b2a0ed;--display:'Avenir Next','Trebuchet MS',sans-serif;--body:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;--mono:ui-monospace,'SFMono-Regular',Consolas,monospace;color-scheme:light;font-family:var(--body);color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.36}a{color:inherit;text-decoration:none}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,canvas:focus-visible{outline:3px solid #437afa;outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:var(--display)}h2{font-size:23px;font-weight:650;letter-spacing:-.65px}h3{font-size:17px}p{line-height:1.65}button{border:0;background:none}::selection{background:#bcd1ff}.skip-link{position:fixed;top:-80px;left:20px;z-index:200;background:white;padding:14px;border-radius:8px}.skip-link:focus{top:10px}
.site-header{height:104px;padding:0 max(28px,calc((100vw - 1240px)/2));display:flex;align-items:center;gap:50px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.8)}.brand{display:flex;align-items:center;gap:12px;font-family:var(--display);font-size:17px;font-weight:750;letter-spacing:-.7px;line-height:1.02}.brand>span>span{display:block;font-size:26px;line-height:1.1}.brand .brand-dot{display:inline;color:var(--blue)}.brand-symbol{width:43px;height:43px;fill:none;stroke:var(--blue);stroke-width:1.8}.brand-symbol circle{fill:var(--blue);stroke:none}.site-header nav{display:flex;align-items:center;gap:34px;margin-left:auto;font-size:13px;font-weight:550;white-space:nowrap}.site-header nav a{position:relative;display:flex;align-items:center;gap:7px;height:104px;color:var(--muted)}.site-header nav a[aria-current]{color:var(--blue)}.site-header nav a[aria-current]:after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--blue)}.nav-counter{font-size:10px;background:#e9effa;color:#5876a7;padding:2px 5px;border-radius:4px}.notebook-dot{width:6px;height:6px;border-radius:50%;background:var(--blue)}.notebook-dot[hidden]{display:none}.help-button{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:14px;color:#778995}.help-button>span{font-family:var(--body);font-size:12px}.help-button:hover{color:var(--blue)}
main{max-width:1240px;margin:0 auto;padding:43px 0 42px;min-height:calc(100vh - 220px)}main:focus{outline:none}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:32px}.eyebrow{font-family:var(--mono);font-size:9px;font-weight:500;letter-spacing:1.6px;color:#708192;line-height:1.5}.page-heading .eyebrow{margin-bottom:11px;color:#74879a}h1{font-size:48px;line-height:1.18;letter-spacing:-2px;font-weight:650}.heading-spark{display:inline-block;color:var(--blue);font-weight:400;font-size:33px;margin-left:15px;vertical-align:middle;transform:rotate(12deg)}.page-description{font-size:14px;color:var(--muted);margin-top:12px;line-height:1.6}.level-switch{display:flex;align-items:center;gap:3px;padding:4px;border:1px solid var(--line);border-radius:9px;flex-shrink:0;margin-top:20px;background:#edf1f5}.level-switch button{padding:10px 13px;font-size:11px;font-weight:550;border-radius:6px;color:#6b7c8b;white-space:nowrap}.level-switch button[aria-pressed=true]{background:#fff;box-shadow:0 1px 4px #172c3c0c;color:var(--ink)}.level-switch button span{margin-left:5px;color:var(--blue)}.lab-tabs{display:flex;gap:30px;align-items:center;border-bottom:1px solid var(--line);margin-bottom:25px;height:49px}.lab-tabs>a{height:100%;display:flex;align-items:center;gap:9px;font-size:13px;color:#748494;position:relative;padding:0 3px 16px}.lab-tabs>a>span{font-size:20px}.lab-tabs>a.selected{color:var(--blue);font-weight:600}.lab-tabs>a.selected:after{content:'';height:2px;background:var(--blue);position:absolute;left:0;right:0;bottom:-1px}.tabs-note{margin-left:auto;font-size:11px;color:#8996a3;padding-bottom:13px}
.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) 323px;gap:24px;align-items:start}.chamber{position:relative;border-radius:13px;overflow:hidden;background:#142a3a;color:#edf6ff;display:flex;flex-direction:column;min-height:570px}.chamber-top{position:absolute;left:23px;right:18px;top:18px;display:flex;align-items:center;justify-content:space-between;z-index:2;font-size:11px;color:#c0d2df}.chamber-top>span{display:flex;gap:8px;align-items:center}.live-dot{width:5px;height:5px;background:var(--mint);border-radius:100%;box-shadow:0 0 9px #59d9bd66}.expand-button{width:30px;height:30px;border:1px solid #9bbbd331;border-radius:6px;color:#a7bfce;font-size:19px}.expand-button:hover{background:#ffffff12}.model-badge{position:absolute;top:68px;left:23px;z-index:1;font-size:9px;color:#91b1c8;letter-spacing:.15px;border:1px solid #7a9cb32c;padding:5px 8px;border-radius:4px;pointer-events:none}#lab-canvas{display:block;width:100%;height:420px;cursor:grab;touch-action:none}#lab-canvas.dragging{cursor:grabbing}.chamber-caption{display:flex;justify-content:center;gap:6px;font-size:9px;color:#91aabd;margin-top:-18px;padding-bottom:18px;pointer-events:none}.drag-icon{font-size:13px}.chamber-stats{margin:0 24px;display:grid;grid-template-columns:1.15fr 1fr 1fr;border-top:1px solid #8aa9c222;padding:19px 0 17px;gap:16px}.chamber-stats>div{border-right:1px solid #8aa9c222}.chamber-stats>div:last-child{border:0}.chamber-stats span{display:block;font-size:10px;color:#96adbd;margin-bottom:7px}.chamber-stats strong{display:block;font-family:var(--mono);font-size:23px;font-weight:450;letter-spacing:-.7px}.chamber-stats>div:first-child strong{font-family:var(--display);font-size:22px;letter-spacing:-.5px}.chamber-bottom{display:flex;align-items:center;border-top:1px solid #8aa9c222;margin:0 24px;padding:12px 0 16px;gap:12px}.stage-button{color:#a5bdcf;font-size:11px;padding:6px 0;display:flex;align-items:center;gap:5px}.stage-button:hover{color:white}.save-button{margin-left:auto;color:#c6dded}.stage-expanded{position:fixed;inset:20px;z-index:80;min-height:0;box-shadow:0 0 0 50px #172c3ce6}.stage-expanded #lab-canvas{height:calc(100vh - 200px)}.stage-expanded .chamber-caption{margin-top:0}.stage-expanded .chamber-stats{margin-top:auto}
.lab-sidebar{display:flex;flex-direction:column;gap:17px}.controls-panel{border:1px solid var(--line);border-radius:12px;background:var(--white);padding:23px 22px 18px}.controls-panel h2{font-size:22px;margin:9px 0 8px}.muted{color:var(--muted);font-size:12px;line-height:1.7}.particle-controls{display:flex;flex-direction:column;gap:21px;margin:26px 0 23px}.particle-row{display:flex;align-items:center;gap:10px}.particle-icon{height:28px;width:28px;border-radius:50%;display:grid;place-items:center;font-size:17px;flex-shrink:0}.particle-icon.p{background:#fff0e6;color:#d68658}.particle-icon.n{background:#ecebff;color:#8c85d3;font-size:12px}.particle-icon.e{background:#dcf6ef;color:#329e86}.particle-label{font-size:12px;font-weight:550;line-height:1.4}.particle-label small{display:block;font-size:9px;color:#8c98a4;font-weight:400;margin-top:3px}.stepper{margin-left:auto;display:flex;align-items:center;gap:8px}.stepper button{width:28px;height:30px;border:1px solid var(--line);border-radius:6px;font-size:16px;color:#748491;background:#fff}.stepper button:hover:not(:disabled){background:#edf3ff;color:var(--blue);border-color:#c7d8ff}.stepper output{font-family:var(--mono);font-size:15px;min-width:23px;text-align:center}.reset-actions{display:flex;justify-content:space-between;border-top:1px solid #edf0f3;padding-top:13px}.text-button{padding:4px 0;color:#6c8091;font-size:11px;text-align:left;line-height:1.5}.text-button:hover{color:var(--blue)}.element-card{background:#e9f0ff;border:1px solid #d9e5fb;border-radius:12px;padding:18px 21px}.element-card-top{display:flex;justify-content:space-between;font-family:var(--mono);font-size:10px;color:#6083b9}.element-card-main{display:flex;align-items:center;gap:17px;margin:8px 0 14px}.element-card-main>strong{font-family:var(--display);font-size:58px;font-weight:550;color:#3265b6;line-height:1.1;letter-spacing:-3px;min-width:47px}.element-card-main h2{font-size:20px;color:#294f83;margin-bottom:3px}.element-card-main div>span{font-size:10px;color:#6581aa}.stability-line{display:flex;align-items:center;gap:7px;border-top:1px solid #d8e4f7;padding-top:12px;color:#486e96;font-size:10px}.stability-indicator{height:5px;width:5px;border-radius:50%;background:#85a1be;flex-shrink:0}.stability-indicator[data-kind=stable]{background:#43aa8e}.stability-indicator[data-kind=radioactive]{background:#d59a57}.element-card>p{font-size:9px;color:#6c85a6;line-height:1.6;margin-top:7px}.orbital-picker{display:grid;grid-template-columns:repeat(5,1fr);gap:5px;margin:24px 0 20px}.orbital-picker button{border:1px solid var(--line);border-radius:6px;font-family:var(--mono);font-size:12px;padding:10px 0}.orbital-picker button[aria-pressed=true]{color:var(--blue);border-color:#a5c2ff;background:#eef4ff}.controls-panel h3{font-size:17px;margin-bottom:7px}.slider-field{margin-top:22px}.slider-field label{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:10px}.slider-field label span{font-family:var(--mono);color:var(--ink);font-size:10px}input[type=range]{width:100%;accent-color:var(--blue);height:20px;cursor:pointer;margin:0}.quantum-note{padding:20px 21px;background:#e8f4f1;border:1px solid #d6e9e3;border-radius:12px;position:relative}.quantum-note h3{font-size:17px;margin:0 0 9px}.quantum-note>p{font-size:11px;color:#4e776f;line-height:1.7}.note-star{position:absolute;top:15px;right:17px;color:#66a293;font-size:22px}.phase-legend{display:flex;gap:22px;font-family:var(--mono);font-size:11px;margin:15px 0 8px;color:#3c6860}.phase-legend span{display:flex;gap:7px;align-items:center}.phase-legend i{width:7px;height:7px;border-radius:100%}.positive-phase{background:#34ad95}.negative-phase{background:#ed9d71}.quantum-note .microcopy{font-size:9px}
.periodic-section{margin-top:35px}.section-heading{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:20px}.section-heading h2{margin-top:7px;font-size:23px}.section-aside{font-size:10px;color:#8593a1}.periodic-table{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));grid-template-rows:repeat(4,70px);gap:5px;position:relative}.element-cell{border:1px solid #dce4ec;border-radius:5px;padding:6px 5px;background:#ecf0f5;text-align:left;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between;color:#5c708b;min-width:0}.element-cell small{font-size:8px;font-family:var(--mono)}.element-cell strong{font-size:20px;font-family:var(--display);line-height:1.1;font-weight:550;letter-spacing:-1px}.element-cell>span{font-size:7px;white-space:nowrap;max-width:100%;overflow:hidden}.element-cell.nonmetal{background:#e4efee;color:#4a7f77;border-color:#d4e4e0}.element-cell.noble-gas{background:#ece7f7;color:#8876a9;border-color:#e3dcf0}.element-cell.halogen{background:#e5f2f6;color:#5d8a9d;border-color:#d5e7ee}.element-cell.alkali-metal{background:#f9ece5;color:#ae8366;border-color:#eddfd5}.element-cell.alkaline-earth-metal{background:#f5efdf;color:#9a8955;border-color:#ece3c9}.element-cell.metalloid{background:#e9eddd;color:#7d8e5d;border-color:#dfe4cb}.element-cell.post-transition-metal{background:#e7edf5;color:#718caf;border-color:#dce4ef}.element-cell[aria-pressed=true]{background:#2763e7!important;color:#fff!important;border-color:#2763e7;box-shadow:0 3px 9px #2763e723;transform:translateY(-2px)}.element-cell:hover:not([aria-pressed=true]){border-color:#729aeb;transform:translateY(-2px)}.periodic-tip{grid-column:4/12;grid-row:1/3;display:flex;gap:13px;align-items:center;padding-left:14px;color:#8d9caa;font-size:11px}.periodic-tip>span{font-size:25px;transform:rotate(-15deg);color:#96a9bd}.periodic-tip strong{font-weight:550;color:#567392}.section-footnote{font-size:10px;color:#82919f;margin-top:13px;line-height:1.7}.explanation{display:flex;gap:18px;border:1px solid var(--line);border-radius:10px;padding:23px 25px;background:#fff;margin-top:30px;align-items:flex-start}.explanation-icon{width:30px;height:30px;background:#edf2fb;color:#6590cd;display:grid;place-items:center;border-radius:50%;font-family:Georgia,serif;font-size:18px;flex-shrink:0}.explanation h2{font-size:17px;letter-spacing:-.3px;margin-bottom:9px}.explanation p{font-size:11px;color:#6c7f8d;line-height:1.85;max-width:1040px}.explanation .microcopy{font-size:9px;margin-top:7px;color:#8a97a2}.explanation .model-detail{font-weight:550;color:#527f78;margin-top:8px}.continue-strip{display:flex;align-items:center;gap:17px;margin-top:30px;padding:23px 26px;border-radius:10px;background:#e9eef9}.continue-symbol{color:#597fc6;font-size:37px}.continue-strip h2{font-size:18px}.continue-strip p{font-size:11px;color:#798ba1;margin-top:4px}.continue-strip>a{margin-left:auto;flex-shrink:0}.outline-button,.primary-button{display:inline-flex;align-items:center;justify-content:center;gap:18px;padding:12px 17px;border-radius:7px;font-size:11px;font-weight:550;line-height:1.4}.outline-button{border:1px solid #cdd9e8;background:transparent;color:#41618a}.outline-button:hover{background:#ffffff7a;border-color:#92b1db}.primary-button{background:var(--blue);color:white;border:1px solid transparent}.primary-button:hover{background:#1d54ce}.primary-button:focus-visible{outline-color:#99b6f9}.site-footer{max-width:1240px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding:24px 0 30px;gap:20px;font-size:10px;color:#8c99a4}.site-footer button{font-size:10px}
.mission-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:42px}.mission-card{padding:25px 25px 27px;background:#fff;border:1px solid var(--line);border-radius:12px;display:flex;flex-direction:column;align-items:start}.mission-card-top{display:flex;align-items:center;justify-content:space-between;width:100%;margin-bottom:33px}.mission-number{font-family:var(--mono);color:#9eb8dd;font-size:32px;font-weight:300;letter-spacing:-2px}.small-badge{font-size:9px;padding:5px 8px;border-radius:5px;background:#edf3f8;color:#7d8e9d}.mission-tag{font-family:var(--mono);text-transform:uppercase;font-size:9px;letter-spacing:1.3px;color:#477ccd;margin-bottom:12px}.mission-card h2{font-size:24px;line-height:1.2;margin-bottom:15px}.mission-card>p{font-size:13px;margin-bottom:13px}.mission-card>p.muted{font-size:11px;margin-bottom:28px}.mission-card .primary-button{margin-top:auto;width:100%;justify-content:space-between}.mission-banner{padding:23px 26px;border:1px solid #dce4c7;background:#f2f5e9;border-radius:10px;margin-bottom:24px}.mission-banner-title{display:flex;align-items:center;gap:11px}.mission-emblem{font-size:34px;color:#799252}.mission-banner-title h2{font-size:19px;margin:5px 0}.mission-banner .eyebrow{font-size:8px;color:#83946c}.mission-banner-title .icon-button{margin-left:auto}.mission-banner>p{font-size:12px;color:#6a7856;margin:10px 0 14px}.mission-banner fieldset{border:0;padding:0;margin:15px 0}.mission-banner legend{font-size:13px;font-weight:550;margin-bottom:13px}.hypothesis{display:inline-flex;align-items:center;gap:6px;font-size:11px;margin:0 21px 10px 0;cursor:pointer;line-height:1.6}.hypothesis input{accent-color:var(--blue);width:16px;height:16px;margin:0}.mission-actions{display:flex;gap:20px;align-items:center}.mission-banner .mission-feedback{margin:14px 0 0;font-size:12px;color:#8d7247}.mission-feedback:empty{display:none}.mission-banner .mission-feedback.success{color:#377a62}.icon-button{width:30px;height:30px;border-radius:5px;color:#95a3ac;font-size:22px;display:grid;place-items:center;flex-shrink:0}.icon-button:hover{background:#172c3c09;color:var(--ink)}
.modules-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:38px}.module-card{display:flex;flex-direction:column;align-items:start;border:1px solid var(--line);background:#fff;border-radius:12px;padding:24px 22px;min-height:282px}.module-card-top{display:flex;align-items:center;justify-content:space-between;width:100%;margin-bottom:28px;gap:10px}.module-icon{background:var(--module-color);width:45px;height:45px;display:grid;place-items:center;border-radius:12px;font-size:28px;color:#496477}.module-card .small-badge{font-size:8px;padding:4px 5px}.module-card .eyebrow{font-size:8px;letter-spacing:.4px;margin-bottom:7px}.module-card h2{font-size:21px;margin-bottom:10px;line-height:1.2}.module-card>p:not(.eyebrow){font-size:11px;color:var(--muted);margin-bottom:22px}.module-card>a,.module-card>button{margin-top:auto;font-size:11px;color:var(--blue)}.text-link:hover{text-decoration:underline}.notebook-toolbar{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:var(--muted);padding-bottom:24px;border-bottom:1px solid var(--line);gap:16px}.empty-state{text-align:center;padding:65px 10px 80px}.empty-symbol{display:block;font-size:65px;color:#9cb6dd;margin-bottom:14px}.empty-state h2{font-size:28px;margin-bottom:14px}.empty-state p{font-size:13px;color:var(--muted);margin-bottom:25px}.notebook-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:25px}.notebook-entry{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px}.entry-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:20px}.entry-type{font-size:10px;color:#8195a9}.notebook-entry h2{font-size:22px;margin-bottom:10px}.notebook-entry p{font-size:12px;color:var(--muted)}.notebook-entry blockquote{margin:18px 0;border-left:2px solid #c6d9f6;padding:0 0 0 12px;font-size:13px;line-height:1.7;overflow-wrap:anywhere;white-space:pre-wrap}.notebook-entry time{font-family:var(--mono);font-size:9px;color:#95a3af;display:block;margin-top:20px}
dialog{border:1px solid var(--line);border-radius:15px;padding:36px;max-width:590px;width:calc(100vw - 32px);max-height:85vh;color:var(--ink);box-shadow:0 20px 100px #172c3c40}dialog::backdrop{background:#172c3c99;backdrop-filter:blur(4px)}dialog h2{font-size:28px;letter-spacing:-.8px;line-height:1.2;margin:10px 26px 20px 0}dialog p{font-size:12px;margin-bottom:15px;color:#627788}dialog .eyebrow{font-size:9px;margin-bottom:10px}dialog .dialog-close{position:absolute;right:17px;top:14px;width:32px;height:32px;font-size:24px;color:#8a9da9}dialog .microcopy{font-size:10px}dialog a:not(.primary-button){color:var(--blue)}.help-steps{padding-left:20px;font-size:12px;color:#627788;line-height:1.85}.help-steps li{margin-bottom:13px;padding-left:4px}.sources-list{padding-left:16px;font-size:11px;line-height:2.3;margin:20px 0}.note-label{display:flex;justify-content:space-between;font-size:12px;margin:24px 0 10px}.note-label>span{font-size:10px;color:#8a99a6}textarea{width:100%;resize:vertical;border:1px solid var(--line);border-radius:7px;padding:12px;font-size:12px;line-height:1.7;min-height:95px;color:var(--ink);margin-bottom:18px}textarea::placeholder{color:#9ba9b5}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;pointer-events:none;max-width:calc(100vw - 32px);width:max-content;background:#254354;color:#fff;padding:14px 22px;border-radius:9px;font-size:12px;box-shadow:0 6px 30px #172c3c26;z-index:150;transition:opacity .15s,transform .15s}.toast.visible{opacity:1;transform:translate(-50%,0)}
@media(min-width:1550px){main{padding-top:52px}.page-heading{margin-bottom:38px}.chamber{min-height:600px}#lab-canvas{height:450px}}
@media(max-width:1320px){main,.site-footer{margin-left:32px;margin-right:32px}.site-header{padding:0 32px}.lab-layout{grid-template-columns:minmax(0,1fr) 305px;gap:22px}.controls-panel{padding:23px 18px 18px}.element-cell>span{font-size:6px}.modules-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:1050px){.site-header{gap:25px}.site-header nav{gap:23px}.help-button>span{display:none}.help-button{width:25px;height:25px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center}.lab-layout{grid-template-columns:minmax(0,1fr) 285px;gap:18px}h1{font-size:42px}.page-heading{align-items:start}.level-switch{margin-top:30px}.level-switch button{font-size:10px;padding:9px 10px}.tabs-note{font-size:9px}.chamber-stats{gap:10px;margin:0 18px}.chamber-stats strong{font-size:21px}.chamber-stats>div:first-child strong{font-size:19px}.chamber-stats span{font-size:8px}.chamber-bottom{margin:0 18px}.stage-button{font-size:10px}.periodic-table{gap:4px;grid-template-rows:repeat(4,62px)}.element-cell{padding:4px 3px}.element-cell strong{font-size:17px}.element-cell>span{display:none}.periodic-tip{font-size:10px}.mission-grid{gap:15px}.mission-card{padding:21px}.mission-card h2{font-size:21px}.notebook-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){main{padding-top:30px}.site-header{height:85px;padding:0 24px;gap:20px}.site-header nav{gap:18px;font-size:11px}.site-header nav a{height:85px}.brand{font-size:13px;gap:8px}.brand>span>span{font-size:22px}.brand-symbol{width:36px}.page-heading{flex-wrap:wrap;gap:15px;margin-bottom:22px}.level-switch{margin-top:0}.lab-layout{grid-template-columns:minmax(0,1fr) 265px;gap:15px}.controls-panel{padding:20px 15px 17px}.controls-panel h2{font-size:19px}.particle-row{gap:6px}.particle-label{font-size:11px}.particle-label small{font-size:8px}.stepper{gap:4px}.stepper button{width:26px}.particle-icon{width:23px;height:23px}.chamber{min-height:545px}#lab-canvas{height:395px}.chamber-stats>div:first-child strong{font-size:17px}.chamber-stats strong{font-size:19px}.chamber-stats{grid-template-columns:1.2fr 1fr .8fr}.chamber-bottom{gap:8px}.save-button{font-size:9px}.tabs-note{display:none}.module-card{padding:22px 18px}.modules-grid{grid-template-columns:repeat(2,1fr)}.mission-grid{grid-template-columns:1fr}.mission-card{display:grid;grid-template-columns:1fr 1fr;column-gap:25px}.mission-card-top{grid-column:1/-1;margin-bottom:20px}.mission-card .mission-tag{grid-column:1}.mission-card h2{grid-column:1}.mission-card>p{grid-column:2;grid-row:2/4}.mission-card>p.muted{grid-column:2;grid-row:4/6}.mission-card .primary-button{grid-column:1;margin-top:10px}.continue-strip{padding:22px 20px;gap:12px}.continue-strip h2{font-size:16px}.continue-strip p{font-size:10px}.continue-strip .outline-button{font-size:10px;padding:10px 12px;gap:10px}.site-footer{font-size:9px}}
@media(max-width:650px){.site-header{height:auto;min-height:106px;flex-wrap:wrap;padding:17px 20px 0;gap:0}.brand{margin-bottom:14px}.help-button{margin-left:auto;margin-bottom:16px}.site-header nav{order:3;width:100%;justify-content:space-between;gap:12px;font-size:11px;margin:0}.site-header nav a{height:38px;padding-bottom:10px}.nav-counter{font-size:8px}.brand-symbol{width:32px;height:32px}.brand{font-size:12px}.brand>span>span{font-size:19px}.site-header nav a[aria-current]:after{height:2px}main,.site-footer{margin-left:20px;margin-right:20px}main{padding-top:29px;padding-bottom:30px}h1{font-size:36px;letter-spacing:-1.5px}.heading-spark{font-size:26px;margin-left:10px}.page-heading .eyebrow{font-size:7px;letter-spacing:1.15px;margin-bottom:10px}.page-description{font-size:12px;margin-top:10px;max-width:360px}.page-heading{gap:18px;margin-bottom:20px}.level-switch{width:100%;max-width:330px}.level-switch button{flex:1;font-size:10px;padding:9px 12px}.lab-tabs{gap:27px;height:43px;margin-bottom:18px}.lab-tabs>a{font-size:12px;gap:7px;padding-bottom:13px}.lab-tabs>a>span{font-size:18px}.lab-layout{display:flex;flex-direction:column;gap:17px}.chamber{width:100%;min-height:480px}#lab-canvas{height:333px}.chamber-top{left:18px;right:15px;top:15px;font-size:10px}.model-badge{left:18px;top:57px;font-size:8px}.chamber-stats{margin:0 18px;grid-template-columns:1.1fr 1fr .6fr;padding:16px 0 15px;gap:12px}.chamber-stats>div:first-child strong{font-size:20px}.chamber-stats strong{font-size:21px}.chamber-stats span{font-size:9px}.chamber-bottom{margin:0 18px;padding:10px 0 14px}.chamber-caption{font-size:8px;margin-top:-12px;padding-bottom:15px}.stage-button{font-size:10px}.save-button{font-size:10px}.stage-expanded{inset:10px}.stage-expanded #lab-canvas{height:calc(100dvh - 195px)}.lab-sidebar{width:100%;gap:15px}.controls-panel{padding:22px}.controls-panel h2{font-size:23px}.controls-panel>.muted{font-size:12px}.desktop-only{display:none}.particle-controls{margin:22px 0 20px;gap:19px}.particle-icon{width:30px;height:30px;font-size:18px}.particle-row{gap:12px}.particle-label{font-size:13px}.particle-label small{font-size:9px}.stepper{gap:12px}.stepper button{width:34px;height:34px}.stepper output{min-width:24px;font-size:17px}.text-button{font-size:11px}.element-card{padding:18px 22px}.element-card-main>strong{font-size:60px}.element-card-main h2{font-size:22px}.element-card-main{margin:5px 0 12px;gap:20px}.stability-line{font-size:11px}.element-card>p{font-size:10px}.element-card-main div>span{font-size:11px}.periodic-section{margin-top:29px}.section-heading{gap:12px;align-items:center;margin-bottom:18px}.section-heading h2{font-size:21px;margin-top:5px}.section-heading .eyebrow{font-size:8px;letter-spacing:.9px}.section-aside{font-size:8px;max-width:62px;line-height:1.5;text-align:right}.periodic-scroll{overflow-x:auto;padding:2px 1px 12px;scrollbar-width:thin;scrollbar-color:#c5d3e3 transparent}.periodic-table{min-width:690px;grid-template-rows:repeat(4,59px);gap:4px}.periodic-tip{font-size:10px;padding-left:5px}.element-cell strong{font-size:18px}.element-cell small{font-size:7px}.section-footnote{font-size:9px;margin-top:10px}.explanation{padding:20px 18px;gap:12px;margin-top:24px}.explanation h2{font-size:17px}.explanation p{font-size:11px}.explanation .microcopy{font-size:9px}.explanation-icon{width:26px;height:26px;font-size:16px}.continue-strip{flex-wrap:wrap;padding:22px 18px;margin-top:24px;gap:12px}.continue-symbol{font-size:29px}.continue-strip>div{flex:1}.continue-strip h2{font-size:16px}.continue-strip p{font-size:10px}.continue-strip>a{margin-left:41px}.site-footer{flex-direction:column;align-items:start;gap:8px;padding:20px 0 24px;font-size:9px}.site-footer button{font-size:9px}.orbital-picker{gap:8px;margin:22px 0}.orbital-picker button{font-size:15px;padding:12px 0}.quantum-note{padding:22px}.quantum-note>p{font-size:12px}.quantum-note h3{font-size:20px}.slider-field label{font-size:12px}.slider-field label span{font-size:11px}.mission-grid{margin-top:28px;gap:16px}.mission-card{display:flex;padding:25px}.mission-card-top{margin-bottom:25px}.mission-card h2{font-size:25px}.mission-card>p{font-size:13px}.mission-card>p.muted{font-size:12px}.mission-card .primary-button{margin-top:4px;font-size:12px}.mission-banner{padding:20px 18px}.mission-banner-title h2{font-size:18px}.mission-banner>p{font-size:12px}.hypothesis{display:flex;margin-bottom:13px;font-size:12px;gap:9px}.mission-banner legend{line-height:1.6}.mission-actions{gap:15px}.mission-actions .primary-button{padding:11px 12px;font-size:10px}.mission-actions .text-button{font-size:10px}.mission-banner .mission-feedback{font-size:11px}.modules-grid{grid-template-columns:1fr;margin-top:25px;gap:16px}.module-card{padding:24px;min-height:260px}.module-card h2{font-size:25px}.module-card>p:not(.eyebrow){font-size:12px}.module-card-top{margin-bottom:24px}.module-card .eyebrow{font-size:9px}.module-card .small-badge{font-size:9px;padding:6px 8px}.module-card>a,.module-card>button{font-size:12px}.notebook-toolbar{align-items:start;font-size:10px;line-height:1.7}.notebook-toolbar .outline-button{font-size:10px;white-space:nowrap;padding:10px 12px}.notebook-grid{grid-template-columns:1fr;gap:15px}.empty-state{padding:43px 0 50px}.empty-state h2{font-size:24px}.empty-state p{font-size:12px}dialog{padding:28px 24px}dialog h2{font-size:25px}dialog p{font-size:12px}.help-steps{font-size:12px}.toast{font-size:11px;padding:13px 17px;bottom:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

.scale-note{font-size:9px;color:#728595;line-height:1.7;margin-top:8px}.compact-table-note{display:none}
@media(max-width:650px){.periodic-table{min-width:0;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(4,58px);gap:4px}.periodic-table .element-cell{grid-column:var(--compact-column)!important;padding:5px}.periodic-tip{grid-column:2/8;grid-row:1;font-size:8px;padding-left:8px;gap:8px;pointer-events:none;padding-right:34px}.periodic-tip>span{font-size:18px}.compact-table-note{display:block;font-size:8px;color:#7d8f9f;line-height:1.7;margin-top:4px}.scale-note{font-size:10px}.periodic-scroll{overflow-x:visible;padding-bottom:0}}

/* Scientific workspaces share the existing visual system. */
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.notebook-actions{display:flex;gap:10px;align-items:center}.import-label{cursor:pointer}.import-label:has(+input:focus-visible){outline:3px solid #437afa;outline-offset:4px}.series-data{font-size:10px;max-height:250px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere}.notebook-entry h2{overflow-wrap:anywhere}.notebook-entry details{margin-top:15px;font-size:12px}.notebook-entry details summary{cursor:pointer;color:#3f6599}.stepper input[type=number]{width:45px;text-align:center;font-family:var(--mono);font-size:15px;padding:4px 0;border:0;border-bottom:1px solid #c8d5e4;color:var(--ink);background:#f8faff;appearance:textfield;-moz-appearance:textfield}.stepper input::-webkit-inner-spin-button,.stepper input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.stepper{gap:5px}.particle-row{gap:8px}.particle-label{font-size:11px}.particle-label small{font-size:8px}.controls-panel .particle-controls{gap:21px}.atom-analysis{display:grid;grid-template-columns:1.1fr 1fr;gap:22px;margin-top:25px}.analysis-card{background:white;border:1px solid var(--line);border-radius:12px;padding:25px;min-width:0}.analysis-card h2{font-size:22px;margin:8px 0 15px}.analysis-card p{font-size:12px;color:#526b7f;line-height:1.8}.analysis-card .small-badge{display:inline-block;color:#4f6e9a;background:#eaf1fc;font-size:10px;padding:6px 9px}.analysis-card .configuration-text{font-family:var(--mono);font-size:19px;font-weight:550;color:#2b507e;margin:17px 0;overflow-wrap:anywhere;line-height:1.65}.shell-occupations{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:18px}.shell-occupations>span{display:flex;flex-direction:column;align-items:center;background:#f0f5fa;border:1px solid #dce7f2;border-radius:8px;padding:9px;min-width:58px}.shell-occupations strong{font-family:var(--mono);font-size:20px;margin:6px 0;color:#365e93}.shell-occupations small{font-size:9px;color:#667f93}.analysis-card details{border-top:1px solid var(--line);padding-top:13px;margin:18px 0}.analysis-card summary{cursor:pointer;font-size:12px;color:#3765a6;line-height:1.7}.analysis-card .configuration-full{font-size:12px;overflow-wrap:anywhere;font-family:var(--mono);margin:14px 0}.subshell-occupations{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px 20px;margin-bottom:15px}.subshell-occupations>div{display:flex;gap:8px;align-items:center;font:10px var(--mono)}.subshell-occupations label{min-width:22px}.subshell-occupations meter{width:100%;height:11px;min-width:25px;accent-color:var(--blue)}.subshell-occupations span{min-width:33px;color:#668099}.analysis-card .microcopy{font-size:10px;line-height:1.75;margin-top:10px}.analysis-card .model-detail{font-size:11px;margin-top:15px;color:#647c8c}.analysis-card>a{font-size:11px;margin-top:13px;display:inline-block;color:#3264b2}.isotope-browser>label{display:block;font-size:12px;margin-bottom:9px}.isotope-browser>label span{color:#70879b}.isotope-browser select,.table-toolbar select,.table-toolbar input{width:100%;border:1px solid #cbd9e8;background:#fbfdff;color:#284457;border-radius:7px;padding:11px;font-size:12px;min-width:0}.nuclear-summary{display:grid;grid-template-columns:.8fr 1.2fr;gap:15px;margin:22px 0}.nuclear-summary span{display:block;font-size:10px;color:#6b8296}.nuclear-summary strong{display:block;font-family:var(--mono);font-size:17px;line-height:1.6;margin-top:9px;overflow-wrap:anywhere;color:#32567d}.table-toolbar{display:flex;align-items:end;gap:15px;margin-top:22px}.table-toolbar>label{flex:1;font-size:11px;color:#536e84;line-height:1.6}.table-toolbar>label>input,.table-toolbar>label>select{display:block;margin-top:7px}.table-toolbar>label:first-child{flex:1.3}.table-toolbar button{height:40px;white-space:nowrap}.table-status{font-size:11px;color:#6a8295;margin:14px 0;min-height:20px}.full-table-scroll{overflow-x:auto;padding:3px 2px 12px;scrollbar-width:thin;scrollbar-color:#9eb8dc transparent}.periodic-table.full-periodic{grid-template-columns:repeat(18,minmax(43px,1fr));grid-template-rows:repeat(7,68px) 18px repeat(2,68px);min-width:920px;gap:5px}.full-periodic .element-cell{grid-column:auto;padding:6px 5px;min-width:0}.full-periodic .element-cell[hidden]{display:none}.full-periodic .periodic-tip{grid-column:4/12;grid-row:1/3;font-size:11px;line-height:1.7;pointer-events:none}.f-block-label{align-self:center;font-size:11px;color:#6c8399;padding-left:8px}.full-periodic .transition-metal{background:#f6e8e7;color:#a06c72;border-color:#ead7d6}.full-periodic .lanthanide{background:#e9e4f7;color:#8370ab;border-color:#ddd6ec}.full-periodic .actinide{background:#f0e5ef;color:#a0769c;border-color:#e7d6e6}.full-periodic .unknown{background:#ecedf2;color:#758294}.periodic-table.full-periodic.filtered{grid-template-columns:repeat(auto-fill,minmax(100px,1fr));grid-template-rows:none;grid-auto-rows:85px;min-width:0;gap:9px}.full-periodic.filtered .element-cell{grid-column:auto!important;grid-row:auto!important;padding:10px}.full-periodic.filtered .element-cell>span{display:block;font-size:11px;white-space:normal}.full-periodic.filtered .periodic-tip,.full-periodic.filtered .f-block-label{display:none}.full-periodic.filtered .element-cell strong{font-size:24px}.active-modules{grid-template-columns:repeat(3,1fr)}
.research-catalog{margin-top:48px}.research-catalog>h2{font-size:28px;margin:9px 0 12px}.research-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:24px}.research-card{padding:24px;background:#fff;border:1px solid var(--line);border-radius:12px;display:flex;flex-direction:column;align-items:start}.research-card h3{font-size:21px;margin:18px 0 13px;line-height:1.35}.research-card p{font-size:13px;color:#526d80;line-height:1.8;margin-bottom:25px}.research-card .outline-button{margin-top:auto}.research-card .small-badge{font-size:9px}.research-panel{background:#edf4f1;border:1px solid #cbded6;border-radius:12px;padding:25px;margin-bottom:25px;max-width:100%;min-width:0}.research-title{display:flex;align-items:center;justify-content:space-between;gap:20px}.research-title h2{font-size:24px;margin:7px 0 13px}.research-panel>p{font-size:13px;line-height:1.8;color:#4e6d61;margin:10px 0 18px}.research-panel .eyebrow{color:#537f6b;font-size:9px}.evidence-checklist{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.evidence-checklist span{background:#fff9;border:1px solid #c8dacf;border-radius:5px;font-size:11px;padding:7px 9px;color:#5b776a}.evidence-checklist .met{color:#216b4f;background:#d4eee1;border-color:#9acdb2}.research-actions{display:flex;flex-wrap:wrap;align-items:center;gap:15px;margin-bottom:15px}.research-panel .microcopy{font-size:10px;color:#617f70}.trial-table-scroll{overflow:auto;max-width:100%;margin:20px 0 24px;border-radius:7px;border:1px solid #cfdfd7;background:white}.trial-table{border-collapse:collapse;width:100%;min-width:530px;text-align:left;font-size:11px}.trial-table caption{text-align:left;padding:12px;font-weight:550;font-size:12px;color:#3c6654;background:#f9fcfa}.trial-table th{background:#edf4f0;font-size:10px;color:#536c60;font-weight:550}.trial-table th,.trial-table td{padding:11px 12px;border-bottom:1px solid #dce8e1;line-height:1.8;vertical-align:top}.trial-table tr:last-child td{border-bottom:0}.research-panel fieldset{padding:0;border:0;margin:20px 0}.research-panel legend{font-weight:550;font-size:14px;margin-bottom:15px;line-height:1.7}.research-panel .hypothesis{display:flex;font-size:12px;margin:0 0 13px;align-items:start;gap:9px}.research-panel .hypothesis input{margin-top:3px;flex-shrink:0}.research-panel .research-feedback{font-size:13px;color:#926633;line-height:1.9;margin-top:18px}.research-panel .research-feedback.success{color:#246948}.research-feedback:empty{display:none}
@media(max-width:1050px){.atom-analysis{grid-template-columns:1fr 1fr}.analysis-card{padding:22px}.research-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.active-modules{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.atom-analysis{grid-template-columns:1fr;gap:17px}.analysis-card{padding:22px}.analysis-card h2{font-size:22px}.analysis-card .configuration-text{font-size:20px}.analysis-card p{font-size:12px}.analysis-card .model-detail{font-size:12px}.shell-occupations{gap:6px}.shell-occupations>span{min-width:57px}.stepper input[type=number]{width:41px;font-size:17px;padding:5px 0}.particle-label{font-size:12px}.particle-label small{font-size:9px}.stepper{gap:5px}.stepper button{width:30px}.particle-row{gap:8px}.table-toolbar{flex-wrap:wrap;gap:12px}.table-toolbar>label,.table-toolbar>label:first-child{flex:1 1 100%}.table-toolbar button{font-size:11px;height:38px}.periodic-table.full-periodic{grid-template-columns:repeat(18,44px);grid-template-rows:repeat(7,59px) 14px repeat(2,59px);min-width:878px;gap:5px}.periodic-table.full-periodic .element-cell{grid-column:auto;padding:5px}.periodic-table.full-periodic .periodic-tip{grid-column:4/12;grid-row:1/3;padding:0;font-size:10px}.f-block-label{font-size:9px;line-height:1.7}.periodic-table.full-periodic.filtered{grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:none;grid-auto-rows:82px;min-width:0}.periodic-table.full-periodic.filtered .element-cell{grid-column:auto!important;padding:9px}.full-periodic.filtered .element-cell>span{font-size:10px}.full-table-scroll{overflow-x:auto!important;padding-bottom:12px}.active-modules{grid-template-columns:1fr}.notebook-toolbar{flex-wrap:wrap}.notebook-actions{flex-wrap:wrap;gap:10px}.notebook-actions>.outline-button{font-size:11px;padding:11px}.research-card-grid{grid-template-columns:1fr}.research-card{padding:23px}.research-catalog>h2{font-size:25px}.research-panel{padding:20px 17px}.research-title h2{font-size:22px}.research-panel>p{font-size:12px}.research-actions{gap:12px}.research-actions>.primary-button{width:100%;font-size:12px}.research-actions>.text-button{font-size:11px}.evidence-checklist span{font-size:10px}.research-panel .hypothesis{font-size:12px}.research-panel .research-feedback{font-size:12px}.trial-table{font-size:10px}}

.element-position { color: var(--muted); font-size: 13px; margin: 10px 0; }
.table-selection-summary { padding: 12px 16px; border-left: 2px solid var(--mint); color: var(--ink); background: rgba(115,230,202,.045); font-size: 14px; margin: 18px 0; }