:root{color-scheme:light;--ink:#202631;--muted:#596474;--line:#d5dee5;--teal:#126d87;--green:#197448;--red:#ad304b}
*{box-sizing:border-box;letter-spacing:0}
button,input,select,textarea{max-width:100%}
body{margin:0;background:#fff;color:var(--ink);font:16px/1.5 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.breadcrumbs,.app-header,main,footer{width:100%;max-width:1280px;margin-inline:auto}
a{color:var(--teal);text-underline-offset:3px}button,input,select{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}.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}
button{border:1px solid var(--line);border-radius:4px;background:#fff;color:var(--ink);min-height:40px;cursor:pointer;padding:8px 10px;display:inline-flex;align-items:center;justify-content:center;gap:8px}
button:hover{background:#edf5f7}button:disabled{opacity:.45;cursor:default}button svg{width:20px;height:20px;flex-shrink:0}
:where(button,a,input,select,[tabindex]):focus-visible{outline:3px solid #0865cd;outline-offset:3px}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:6px;padding:10px 24px;font-size:13px;border-bottom:1px solid var(--line)}
.app-header{padding:14px 24px;display:flex;justify-content:space-between;align-items:center;gap:12px}.app-header>div{display:flex;align-items:baseline;gap:14px}h1{font-size:26px;line-height:1.2;margin:0}.role-label{font-size:12px;color:var(--muted)}
.related-tools{display:flex;flex-wrap:wrap;gap:4px 16px;font-size:13px;max-width:100%}
main{padding:0 24px 16px}.model-tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-bottom:1px solid var(--line);margin-bottom:16px;gap:4px}
.model-tabs button{border:0;border-radius:0;border-bottom:3px solid transparent;display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:10px 14px}
.model-tabs span{font-size:12px;color:var(--muted)}.model-tabs strong{font-size:17px;font-weight:600}.model-tabs button[aria-pressed=true]{background:#edf6f8;border-bottom-color:var(--teal)}
.workspace{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:24px;align-items:start}.plot-area{min-width:0}.plot-heading{min-height:52px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:8px;flex-wrap:wrap}
#formula{font:600 24px/1.3 system-ui,sans-serif;overflow-wrap:anywhere;min-width:0}.tools{display:flex;gap:4px}.tools button{width:40px;padding:8px}
#graph{width:100%;height:auto;aspect-ratio:1;min-height:0;position:relative;border:1px solid var(--line);overflow:hidden;touch-action:none;background:#fff}
.graph-frame{display:grid;grid-template-columns:minmax(0,1fr) 42px;gap:4px;min-height:0}
.zoom-control{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;color:var(--muted)}
.zoom-control svg{width:17px;height:17px}.zoom-control output{font-size:11px;white-space:nowrap}
#zoom-scale{writing-mode:vertical-lr;direction:rtl;appearance:auto;width:32px;height:150px;max-height:55%;margin:0;accent-color:var(--teal);cursor:pointer;touch-action:none}
.JXGtext{font-family:system-ui,sans-serif!important}.plot-bottom{display:flex;align-items:center;flex-wrap:wrap;gap:10px 20px;font-size:13px;padding:10px 0;color:var(--muted)}.plot-bottom label{display:flex;align-items:center;gap:6px;min-height:30px}input[type=checkbox]{accent-color:var(--teal);width:16px;height:16px}
.controls{border-left:1px solid var(--line);padding-left:24px;min-width:0}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:40px}h2{font-size:15px;margin:0}.section-heading button{border:0;padding:6px;min-height:34px;width:34px}
.control-tabs{display:flex;min-width:0;flex:1}.control-tabs button{flex:1;width:auto;padding:5px 4px;font-size:12px;white-space:nowrap;border-bottom:2px solid transparent;border-radius:0}
.control-tabs button[aria-pressed=true]{border-bottom-color:var(--teal);background:#edf6f8;font-weight:600}
.point-options{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:6px;margin:6px 0}
.point-options select{min-width:0;min-height:32px;font-size:12px;padding:3px;border:1px solid var(--line);border-radius:4px;background:white;color:var(--ink)}
.point-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:12px}.point-table th{font-weight:500;text-align:left;color:var(--muted)}
.point-table th:first-child{width:44px}.point-table th:last-child{width:32px}.point-table thead svg{width:14px;height:14px}.point-table tbody th{color:var(--ink);white-space:nowrap}
.point-selection{vertical-align:middle;margin:0 5px 0 0}.point-table td{padding:2px}.point-table input[type=text]{width:100%;min-height:30px;padding:3px 5px;font:inherit;text-align:right;border:1px solid var(--line);border-radius:4px}
.point-table button{width:28px;min-height:30px;padding:4px;border:0}.point-table button svg{width:16px;height:16px}.point-table .is-locked{background:#f1f4f6}.point-table input:disabled{color:var(--muted)}
.snap-control{display:flex;align-items:center;gap:6px;font-size:12px;min-height:28px}#special-description{font-size:13px;margin:8px 0}
.parameter{display:grid;grid-template-columns:24px minmax(0,1fr) 68px;gap:10px;align-items:center;margin:12px 0}.parameter label{font:italic 20px Georgia,serif}.parameter input[type=range]{width:100%;accent-color:var(--teal);min-height:36px;margin:0;cursor:pointer}
.parameter input[type=text],#probe{border:1px solid var(--line);border-radius:4px;width:100%;padding:6px 8px;min-height:38px;text-align:right;background:#fff}.parameter input[aria-invalid=true],#probe[aria-invalid=true]{border-color:var(--red)}
.facts{border-top:1px solid var(--line);padding-top:12px;font-size:14px}.facts p{margin:4px 0}.facts strong{color:var(--green);font-weight:600}#expanded:empty{display:none}
#probe-form{display:grid;grid-template-columns:30px 70px minmax(0,1fr);align-items:center;gap:8px;margin:14px 0;font-size:14px}#probe-value{overflow-wrap:anywhere}.primary{background:var(--teal);color:white;border-color:var(--teal);width:100%;font-weight:600}.primary:hover{background:#105d73}
.memory{border-top:1px solid var(--line);margin-top:20px;padding-top:10px}#memory-count{color:var(--muted);font-weight:400}#empty-memory{font-size:13px;color:var(--muted)}#memory-list{list-style:none;margin:6px 0;padding:0}.memory-item{padding:8px 0;border-bottom:1px solid #e9eef1;display:flex;align-items:center;gap:8px}.memory-formula{font-size:13px;flex:1;min-width:0;overflow-wrap:anywhere}.swatch{width:18px;border-top:3px dashed var(--green);flex-shrink:0}.memory-item button{min-height:32px;width:30px;padding:5px;border:0}.memory-item svg{width:17px;height:17px}.memory-item.is-hidden .memory-formula{color:var(--muted);text-decoration:line-through}
#feedback{font-size:13px;color:var(--teal);min-height:20px;margin:10px 0}.error{font-size:13px;color:var(--red);margin:4px 0}.error:empty{display:none}footer{border-top:1px solid var(--line);padding:12px 24px;color:var(--muted);font-size:12px}footer p{margin:0 0 5px}
@media(max-width:999px){.model-tabs{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:800px){.workspace{grid-template-columns:minmax(0,1fr);gap:10px}.controls{border-left:0;border-top:1px solid var(--line);padding:10px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:18px}.memory{margin:0;border:0;padding:0}#feedback{grid-column:1/-1}.model-tabs strong{font-size:14px}.model-tabs button{padding:8px}.model-tabs span{font-size:11px}.app-header>div{display:block}.role-label{display:block;margin-top:4px}}
@media(max-width:520px){main{padding:0 12px 12px}.breadcrumbs,.app-header,footer{padding-left:12px;padding-right:12px}.app-header{align-items:flex-start}.app-header>a{font-size:12px;max-width:95px}h1{font-size:23px}.model-tabs{grid-template-columns:repeat(2,minmax(0,1fr));gap:2px;margin-bottom:8px}.model-tabs strong{font-size:15px}.controls{grid-template-columns:1fr}.memory{border-top:1px solid var(--line);padding-top:8px}#formula{font-size:20px}.plot-heading{gap:6px}.tools{margin-left:auto}.plot-bottom{gap:4px 10px}.parameter{grid-template-columns:24px minmax(0,1fr) 76px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media(min-width:801px){.controls{position:sticky;top:12px;max-height:calc(100dvh - 24px);overflow-y:auto}}
.app-header{flex-wrap:wrap}.prototype-note{flex-basis:100%;margin:0;font-size:12px;color:var(--muted)}
@media(max-width:520px){.related-tools{flex-basis:100%;font-size:12px;gap:4px 12px}}
@media(min-width:1000px){
  .breadcrumbs{flex-shrink:0;padding:5px 20px}
  .app-header{flex-shrink:0;padding:7px 20px;gap:3px 12px}h1{font-size:24px}
  main{padding:0 20px 6px}
  .model-tabs{flex-shrink:0;margin-bottom:8px}.model-tabs button{padding:5px 12px;gap:0}.model-tabs strong{font-size:16px}
  .workspace{gap:16px}
  .plot-heading{flex-shrink:0;min-height:40px;padding-bottom:4px;gap:6px}#formula{font-size:21px}
  .tools button{width:32px;min-height:32px;padding:5px}
  .plot-bottom{flex-shrink:0;padding:3px 0;gap:4px 16px}.plot-bottom label{min-height:26px}
  .controls{padding-left:16px}
  .parameters{flex-shrink:0}.section-heading{min-height:34px}
  .parameter{margin:6px 0;gap:8px}.parameter input[type=text]{min-height:36px;padding:4px 8px}
  .facts{padding-top:4px}.facts p{margin:2px 0}
  #probe-form{margin:8px 0}.primary{min-height:38px;padding:6px 10px}
  .memory{margin-top:10px;padding-top:4px}
  .memory .section-heading{flex-shrink:0}#empty-memory{margin:6px 0}
  #memory-list{margin:2px 0 0}.memory-item{padding:4px 0}
  #feedback{flex-shrink:0;margin:6px 0 0}#feedback:empty{display:none}
  footer{flex-shrink:0;display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 8px;padding:6px 20px}footer p{margin:0}
}