:root{--ink:#163345;--muted:#607382;--border:#dce5ec;--paper:#fff;--back:#f3f6fa;--purple:#8254c7;--teal:#078a76;--soft-teal:#e4f4ee;--shadow:0 8px 30px #16334508;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--back);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,select,input[type=checkbox],input[type=range],summary{cursor:pointer}button{color:var(--ink);border:1px solid var(--border);background:white;transition:background .15s,transform .15s}button:hover{background:#edf3f6}button:active{transform:translateY(1px)}button:focus-visible,input:focus-visible,select:focus-visible,canvas:focus-visible,summary:focus-visible{outline:3px solid #48afa0;outline-offset:3px}button:disabled{opacity:.4;cursor:default}a{color:inherit}button,input,select{border-radius:8px}select{background:#fff;border:1px solid var(--border);padding:9px 11px;width:100%;color:var(--ink)}.topbar{padding:20px 5vw;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);background:#fff}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:19px;font-weight:650;letter-spacing:-.3px}.brand-sub{display:block;font-size:9px;letter-spacing:2.2px;font-weight:600;color:var(--muted);margin-top:3px}.top-actions{display:flex;gap:10px;align-items:center}.author{font-size:13px;margin-right:10px;color:var(--muted)}.quiet-button{padding:9px 12px;font-size:12px;font-weight:550}.intro{display:flex;justify-content:space-between;align-items:center;margin:30px 0 22px}.eyebrow{font-size:10px;letter-spacing:1.7px;font-weight:700;color:var(--teal);margin:0 0 8px}h1{margin:0;font-size:clamp(23px,2.4vw,34px);font-weight:600;letter-spacing:-1px}.intro p:not(.eyebrow){font-size:14px;color:var(--muted);margin:9px 0 0}.numerical-badge{display:flex;gap:7px;align-items:center;font-size:11px;color:#52697a;background:#e8eef4;padding:8px 12px;border-radius:20px;white-space:nowrap}.numerical-badge span{width:6px;height:6px;border-radius:50%;background:#8093a1}main{max-width:1530px;padding:0 5vw;margin:auto}.workspace{display:grid;grid-template-columns:285px minmax(0,1fr);gap:18px;align-items:start}.controls,.visual-panel,.chart-panel,.probe-panel,.about{background:var(--paper);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}.control-section{padding:20px;border-bottom:1px solid #e9eef3}h2{font-size:13px;font-weight:650;margin:0 0 13px;letter-spacing:-.1px}.segmented{display:flex;padding:4px;background:#edf2f6;border-radius:10px;gap:2px}.segmented button{flex:1;border:0;background:transparent;padding:10px 4px;font-size:11px;font-weight:650;border-radius:7px}.segmented button.active{background:white;box-shadow:0 2px 5px #1c334412}.segmented span{display:block;font-size:9px;font-weight:500;color:var(--muted);margin-top:2px}.field-label{display:block;font-size:10px;font-weight:550;color:var(--muted);margin:15px 0 6px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-heading h2{margin:0}.icon-button{width:28px;height:28px;border-radius:50%;font-size:10px;background:#f0f6f5;border:0;color:var(--teal)}.power-value{display:flex;align-items:center;gap:13px;margin:13px 0 9px}.power-value input{font-size:30px;font-weight:500;letter-spacing:-1px;max-width:118px;width:118px;padding:0 2px;background:transparent;border:0;color:var(--ink)}.power-value span{font-size:10px;color:var(--muted);line-height:1.4}.power-value input::-webkit-inner-spin-button{opacity:.35}input[type=range]{accent-color:var(--teal);width:100%;margin:10px 0}.range-labels{display:flex;justify-content:space-between;font-size:10px;font-weight:550}.range-labels small{display:block;color:var(--muted);font-size:9px;font-weight:400;margin-top:3px}.quick-powers{display:flex;gap:5px;margin-top:15px;flex-wrap:wrap}.quick-powers button{min-width:27px;padding:6px 4px;font-size:10px;border:0;background:#f0f4f7;border-radius:5px}.quick-powers button.chosen{background:var(--ink);color:#fff}.toggle-row{display:flex;align-items:center;gap:10px;font-size:11px;margin:14px 0}.toggle-row input{accent-color:var(--teal);margin:0;width:14px;height:14px}.toggle-row small{display:block;font-size:9px;color:var(--muted);margin-top:4px}.key{display:inline-block;width:10px;height:10px;border-radius:50%;flex-shrink:0}.key.atomic{background:var(--purple)}.key.hull{background:var(--teal)}.toggle-row.simple{color:#445d6e}.two-fields{display:flex;gap:10px}.two-fields>div{flex:1;min-width:0}.two-fields select{font-size:10px;padding:8px 7px}.vertex-details summary{font-size:11px;font-weight:650;list-style:none}.vertex-details summary:before{content:"+";margin-right:8px;color:var(--teal)}.vertex-details[open] summary:before{content:"−"}.vertex-details summary span{font-size:9px;color:var(--muted);float:right;font-weight:400}.vertex-row{display:flex;align-items:center;gap:5px;margin:12px 0}.vertex-row button{border:0;background:#e8eef4;font-size:10px;width:22px;height:25px;padding:0}.vertex-row button.selected{background:var(--ink);color:white}.vertex-row input{min-width:0;width:65px;padding:6px 4px;border:1px solid var(--border);font-size:10px}.vertex-axis-labels{display:flex;justify-content:space-around;font-size:9px;color:var(--muted);margin:14px 0 0 26px}.small-note{font-size:10px;color:var(--muted);line-height:1.65;margin:12px 0 0}.control-footer{padding:15px;display:flex;gap:6px;justify-content:center}.control-footer button{font-size:10px;padding:8px}.canvas-toolbar{height:54px;display:flex;align-items:center;justify-content:space-between;padding:0 19px;border-bottom:1px solid #e9eef3;gap:8px}.canvas-toolbar>div:first-child{display:flex;gap:14px;align-items:center}.canvas-toolbar #shape-label{font-size:12px;font-weight:650}.canvas-toolbar #canvas-hint{font-size:10px;color:var(--muted)}.view-buttons{display:flex;gap:5px}.view-buttons button{font-size:10px;padding:6px 8px;border:0;background:#eff3f7}.canvas-wrap{position:relative;height:540px;min-height:420px;background:radial-gradient(ellipse at center,#fff 30%,#f8fafc 100%)}#geometry{display:block;width:100%;height:100%;touch-action:none;cursor:grab}#geometry.dragging{cursor:grabbing}#calculation-status{position:absolute;top:16px;left:18px;color:#6a7d8a;font-size:10px;background:#ffffffdd;border:1px solid #e8eef3;padding:7px 10px;border-radius:20px;pointer-events:none;max-width:85%}#calculation-status.warning{color:#996628;border-color:#ead6b0;background:#fff8e9ee}.canvas-help{position:absolute;bottom:16px;left:19px;font-size:10px;color:#83929d;pointer-events:none}.center-readouts{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px;padding:20px;border-top:1px solid #e9eef3;background:#fcfdff}.readout{display:flex;gap:9px;min-width:0;align-items:flex-start}.readout .key{margin-top:3px;width:8px;height:8px}.readout h3{font-size:10px;font-weight:550;color:var(--muted);margin:0 0 9px}.readout h3 span{font-weight:400;opacity:.7;margin-left:6px}.readout output{font-size:11px;font-variant-numeric:tabular-nums;white-space:nowrap}.distance output{font-size:16px;color:#294b5f}.below-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(270px,1fr);gap:18px;margin-top:18px}.chart-panel,.probe-panel{padding:21px}.chart-panel .section-heading p{font-size:10px;color:var(--muted);margin:7px 0 0}.chart-panel select{width:115px;font-size:10px;padding:8px}.chart-panel canvas{display:block;width:100%;height:190px;margin-top:12px;cursor:crosshair;touch-action:none}.probe-panel h2{font-size:16px;margin:0 0 9px}.probe-panel>p:not(.eyebrow){font-size:11px;line-height:1.65;color:var(--muted);margin-top:0}.probe-panel .probe-row{display:flex;justify-content:space-between;gap:10px;font-size:11px;border-bottom:1px solid #edf1f5;padding:12px 0}.probe-row output{font-variant-numeric:tabular-nums;color:var(--muted);font-size:10px}.probe-row output.positive{color:var(--teal)}.probe-row output.negative{color:#b84957}.probe-panel #probe-note{font-size:10px;margin-top:12px}.about{margin:18px 0 24px;padding:20px 23px}.about summary{list-style:none;font-size:12px;font-weight:550}.about summary span{float:right;color:var(--teal);font-size:17px}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:25px}.about-grid h2{font-size:14px}.about p{font-size:12px;line-height:1.8;color:var(--muted)}.about .equation{font-family:Cambria,Georgia,serif;font-size:16px;text-align:center;color:var(--ink);background:#f7f9fb;padding:8px;border-radius:8px}.about .credit{padding-top:16px;border-top:1px solid var(--border);font-size:11px}footer{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:10px;color:var(--muted);padding-bottom:25px}footer a{text-decoration:none}#toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);padding:13px 20px;background:var(--ink);color:white;font-size:12px;border-radius:9px;box-shadow:0 6px 18px #0002;z-index:10}[hidden]{display:none!important}
@media(min-width:1500px){main{padding:0 45px}.canvas-wrap{height:590px}.controls{min-height:725px}}@media(max-width:1100px){main{padding:0 3vw}.topbar{padding:16px 3vw}.workspace{grid-template-columns:255px 1fr;gap:12px}.control-section{padding:17px}.center-readouts{gap:10px;padding:16px}.readout output{font-size:10px}.canvas-toolbar{padding:0 12px}#canvas-hint{display:none}.view-buttons{gap:2px}.view-buttons button{padding:6px}.distance output{font-size:13px}}@media(max-width:820px){.workspace{grid-template-columns:1fr}.controls{display:grid;grid-template-columns:1fr 1fr}.control-section{border-right:1px solid #e9eef3}.vertex-details{grid-column:1/3}.control-footer{grid-column:1/3}.visual-panel{grid-row:1}.canvas-wrap{height:460px}.intro{margin-top:23px}.numerical-badge{font-size:9px;padding:7px}.below-grid{grid-template-columns:1fr}.author{display:none}.about-grid{grid-template-columns:1fr;gap:15px}.top-actions button{font-size:10px}.center-readouts{grid-template-columns:1fr 1fr}.readout.distance{grid-column:1/3}.distance h3,.distance output{display:inline;margin-right:8px}.brand{font-size:16px}}@media(max-width:450px){.top-actions #export-png{display:none}.brand img{width:31px;height:31px}.intro{align-items:flex-start;gap:10px}.numerical-badge{display:none}.canvas-wrap{height:405px}.view-buttons button{font-size:9px}.canvas-toolbar{height:49px}.canvas-toolbar #shape-label{font-size:11px}.controls{grid-template-columns:1fr 1fr}.control-section{padding:14px}.segmented button{font-size:10px}.power-value input{font-size:27px;max-width:88px}.power-value span{display:none}.toggle-row{font-size:10px;gap:7px}.toggle-row small{font-size:8px}.two-fields{flex-direction:column;gap:0}.vertex-details{padding:15px}.chart-panel,.probe-panel{padding:16px}.readout output{font-size:10px}.center-readouts{padding:15px}.topbar{gap:8px}.about{padding:17px}.about summary{font-size:11px}footer{font-size:9px}.canvas-help{font-size:9px}}
.etc-panel{background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:23px;margin-top:18px}.etc-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.etc-heading h2{font-size:19px;margin-bottom:7px}.etc-heading p:not(.eyebrow){font-size:12px;color:var(--muted);margin:0;line-height:1.5}.etc-options{display:flex;gap:12px;min-width:380px}.etc-options>div{flex:1}.etc-options .field-label{margin:0 0 6px}.etc-options select{font-size:11px}.etc-results{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:22px}.etc-card{border:1px solid #e5ebef;border-radius:10px;overflow:hidden}.etc-card h3{font-size:12px;font-weight:600;margin:0;padding:13px 15px;background:#f7fafb}.etc-card h3 .key{width:8px;height:8px;margin-right:6px}.etc-card table{width:100%;border-collapse:collapse;font-size:11px;font-variant-numeric:tabular-nums}.etc-card th{text-align:right;color:var(--muted);font-size:10px;font-weight:500;padding:11px 15px;border-bottom:1px solid #edf1f4}.etc-card th:first-child{text-align:left}.etc-card td{padding:12px 15px;text-align:right;border-bottom:1px solid #edf1f4}.etc-card tr:last-child td{border:0}.etc-card td:first-child{text-align:left;white-space:nowrap}.etc-card td:first-child .key{width:7px;height:7px;margin-right:7px}.etc-card a{text-decoration:none;font-weight:600}.etc-card a:hover{text-decoration:underline}.etc-footnote{display:flex;gap:24px;justify-content:space-between;align-items:center;margin-top:16px}.etc-footnote p,.etc-method p{font-size:10px;color:var(--muted);line-height:1.7;margin:0}.etc-footnote a{font-size:11px;white-space:nowrap;color:var(--teal)}.etc-identity{font-size:11px;background:#eaf5ef;color:#186c59;padding:10px 14px;border-radius:7px}.etc-method{margin-top:15px;padding-top:13px;border-top:1px solid var(--border)}.etc-method summary{font-size:11px;color:var(--muted)}.etc-method p{margin-top:10px}.etc-panel #etc-empty{margin:20px 0 5px;line-height:1.7}
@media(max-width:1100px){.etc-options{min-width:320px}.etc-card th,.etc-card td{padding:11px}}@media(max-width:820px){.etc-heading{display:block}.etc-options{margin-top:16px;min-width:0}.etc-results{gap:12px}.etc-footnote{display:block}.etc-footnote a{display:inline-block;margin-top:10px}}@media(max-width:580px){.etc-panel{padding:17px}.etc-results{grid-template-columns:1fr}.etc-heading h2{font-size:17px}.etc-heading p:not(.eyebrow){font-size:11px}.etc-options{gap:10px}.etc-options select{font-size:10px}.etc-card th,.etc-card td{padding:12px}}
.etc-status{display:block;font-size:9px;font-weight:500;margin:5px 0 0 14px;white-space:normal;max-width:110px;line-height:1.3}.etc-status.failure{color:#a43033}.etc-status.proved{color:#187563}.etc-status.sampled{color:#697782}.etc-witness-button{display:block;font-size:9px;margin:5px 0 0 14px;padding:3px 6px}.etc-response-note{font-size:11px;color:var(--muted);line-height:1.7;margin:16px 0 0}.etc-witness{padding:14px;background:#fff3ee;border:1px solid #efdbd4;border-radius:8px;margin-top:16px}.etc-witness p{font-size:11px;line-height:1.7;margin:0 0 10px}.etc-witness button{font-size:10px;padding:7px 9px;margin-right:7px}[hidden]{display:none!important}