:root{
  --ink:#14243a;--muted:#617084;--paper:#f4f5f1;--surface:#fff;--panel:#e9ece8;
  --line:#cfd5d2;--strong-line:#99a5a2;--accent:#e05a3f;--accent-dark:#b43b27;
  --navy:#0d1d31;--navy-2:#122a46;--cyan:#4ec6ca;--gold:#e5a93f;
  --positive:#ef725e;--negative:#5288d8;--special:#9a72c7;--success:#2f8b68;
  font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);background:var(--paper);font-synthesis:none
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);line-height:1.55}
button,input,select,textarea{font:inherit}
button,select,input[type=range]{cursor:pointer}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid rgba(224,90,63,.35);outline-offset:3px}
.skip-link{position:fixed;z-index:100;top:12px;left:12px;padding:10px 14px;background:var(--surface);color:var(--ink);transform:translateY(-160%)}
.skip-link:focus{transform:none}
.topbar{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1360px)/2));border-bottom:1px solid var(--line);background:rgba(244,245,241,.94)}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:760;letter-spacing:-.02em;text-decoration:none}
.brand svg{width:36px;height:36px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}.brand svg circle{fill:var(--accent);stroke:none}
.model-badge,.state{padding:5px 9px;border:1px solid var(--strong-line);font-size:.72rem;font-weight:750;letter-spacing:.055em;text-transform:uppercase}
main{max-width:1360px;margin:0 auto;padding:0 24px}
.intro{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(360px,.85fr);gap:8vw;align-items:end;padding:78px 0 58px}
h1,h2,h3,p{margin-top:0}
h1{max-width:780px;margin-bottom:0;font-size:clamp(3rem,6vw,5.6rem);line-height:.98;letter-spacing:-.04em;text-wrap:balance}
.intro-copy{max-width:590px}.intro-copy>p:first-child{font-size:1.05rem;line-height:1.78}
.scope-note{margin:24px 0 0;padding-top:18px;border-top:1px solid var(--strong-line);color:var(--muted);font-size:.85rem}.scope-note strong{display:block;margin-bottom:4px;color:var(--ink)}
.lab{display:grid;grid-template-columns:310px minmax(0,1fr);min-height:860px;border:1px solid var(--strong-line);background:var(--surface)}
.control-panel{padding:24px;border-right:1px solid var(--strong-line);background:var(--panel)}
.panel-heading,.structure-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.panel-heading{margin-bottom:26px}.panel-heading h2,.structure-head h2{margin:0;font-size:1.08rem;letter-spacing:-.015em}
.state[data-state=running]{border-color:var(--success);color:var(--success)}.state[data-state=paused]{border-color:var(--gold);color:#8b5e07}
.field{display:block;margin-top:18px}.field>span:first-child{display:flex;justify-content:space-between;gap:16px;margin-bottom:7px;font-size:.78rem;font-weight:760}
.field small{display:block;margin-top:6px;color:var(--muted);font-size:.7rem;line-height:1.45}.field span small{display:inline;margin:0;font-weight:500}
select,textarea{width:100%;border:1px solid var(--strong-line);border-radius:0;background:var(--surface);color:var(--ink)}
select{height:42px;padding:0 36px 0 11px}textarea{min-height:72px;padding:10px 11px;resize:vertical;font-family:"SFMono-Regular",Consolas,monospace;font-size:.8rem;line-height:1.5;text-transform:uppercase}
.range-field>span output{font-variant-numeric:tabular-nums;color:var(--accent-dark)}
input[type=range]{width:100%;height:4px;margin:10px 0 4px;accent-color:var(--accent)}
.control-divider{margin:24px 0 0;border-top:1px solid var(--strong-line)}
.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:24px}
.button{min-height:42px;padding:0 12px;border:1px solid var(--ink);border-radius:0;font-size:.76rem;font-weight:760;transition:background .18s ease,color .18s ease,border-color .18s ease}
.button.primary{background:var(--ink);color:#fff}.button.primary:hover{background:var(--accent);border-color:var(--accent)}
.button.secondary{background:transparent;color:var(--ink)}.button.secondary:hover{background:var(--surface)}
.button.quiet{border-color:var(--strong-line);background:transparent;color:var(--muted)}.button.quiet:hover{border-color:var(--ink);color:var(--ink)}
.button:disabled{cursor:not-allowed;opacity:.45}.button.full{width:100%;margin-top:8px}
.error{min-height:20px;margin:12px 0 0;color:#9f2819;font-size:.72rem;font-weight:700}
.workspace{min-width:0;padding:24px;background:var(--surface)}
.structure-head{min-height:52px}.structure-head p{margin:4px 0 0;color:var(--muted);font-size:.78rem}
.legend{display:flex;justify-content:flex-end;gap:11px;flex-wrap:wrap;max-width:500px;color:var(--muted);font-size:.68rem}
.legend span{display:flex;align-items:center;gap:5px}.legend i{width:9px;height:9px;border-radius:50%;background:var(--cyan)}
.legend i[data-type=hydrophobic]{background:var(--gold)}.legend i[data-type=positive]{background:var(--positive)}.legend i[data-type=negative]{background:var(--negative)}.legend i[data-type=special]{background:var(--special)}
.structure-stage{position:relative;height:475px;margin-top:14px;overflow:hidden;background:var(--navy)}
.structure-stage::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 50% 45%,rgba(78,198,202,.08),transparent 58%)}
canvas{display:block;width:100%;height:100%}
.tooltip{position:absolute;z-index:4;pointer-events:none;padding:7px 9px;border:1px solid rgba(255,255,255,.35);background:rgba(8,20,36,.94);color:#fff;font-size:.7rem;box-shadow:0 8px 24px rgba(0,0,0,.24)}
.metrics{display:grid;grid-template-columns:repeat(5,1fr);margin:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);border-left:1px solid var(--line)}
.metrics div{min-width:0;padding:15px 14px;border-right:1px solid var(--line)}.metrics div:last-child{border-right:0}
.metrics dt{color:var(--muted);font-size:.68rem;font-weight:700}.metrics dd{margin:2px 0 0;font-size:1.25rem;font-weight:760;font-variant-numeric:tabular-nums;letter-spacing:-.02em}.metrics small{color:var(--muted);font-size:.62rem}
.analysis-grid{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(240px,1fr);gap:1px;margin-top:22px;background:var(--strong-line);border:1px solid var(--strong-line)}
figure{min-width:0;margin:0;padding:16px;background:var(--surface)}figure canvas{height:180px;margin-top:12px}
figcaption{display:flex;justify-content:space-between;gap:20px}figcaption strong{font-size:.82rem}figcaption span{max-width:300px;color:var(--muted);font-size:.68rem;text-align:right}
.reading{display:grid;grid-template-columns:minmax(280px,.72fr) minmax(0,1.28fr);gap:7vw;padding:96px 0}
.reading-title h2{font-size:2.25rem;line-height:1.08;letter-spacing:-.035em}
.tabs{display:flex;flex-direction:column;align-items:stretch;margin-top:40px;border-top:1px solid var(--strong-line)}
.tab{display:flex;align-items:center;min-height:48px;padding:0;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--muted);text-align:left;font-size:.8rem;font-weight:720}
.tab::after{content:"";width:8px;height:8px;margin-left:auto;border-top:1px solid;border-right:1px solid;transform:rotate(45deg)}
.tab.active{color:var(--accent-dark)}
.reading-body{max-width:780px}.tab-panel h3{max-width:650px;margin-bottom:22px;font-size:1.65rem;line-height:1.25;letter-spacing:-.025em}.tab-panel>p{max-width:72ch;color:#3f4e61;line-height:1.85}
.equation{white-space:nowrap;font-family:"SFMono-Regular",Consolas,monospace;color:var(--ink)}
.formula-list,.comparison{margin-top:34px;border-top:2px solid var(--ink)}
.formula-list>div,.comparison>div{display:grid;grid-template-columns:150px minmax(0,1fr);gap:24px;padding:15px 0;border-bottom:1px solid var(--line);font-size:.82rem}.formula-list span,.comparison span{color:var(--muted)}
.experiment-list{margin:30px 0 0;padding:0;border-top:2px solid var(--ink);list-style:none}.experiment-list li{display:grid;grid-template-columns:120px minmax(0,1fr);gap:24px;padding:17px 0;border-bottom:1px solid var(--line);font-size:.84rem}.experiment-list span{color:var(--muted)}
footer{display:flex;justify-content:space-between;gap:30px;padding:26px max(24px,calc((100vw - 1360px)/2));border-top:1px solid var(--strong-line);color:var(--muted);font-size:.7rem}footer p{margin:0}
@media(max-width:1050px){
  .intro{grid-template-columns:1fr;gap:28px}.intro-copy{max-width:760px}.lab{grid-template-columns:280px minmax(0,1fr)}
  .metrics{grid-template-columns:repeat(3,1fr)}.metrics div:nth-child(3){border-right:0}.metrics div:nth-child(n+4){border-top:1px solid var(--line)}
  .analysis-grid{grid-template-columns:1fr}.structure-stage{height:430px}.legend{max-width:340px}
}
@media(max-width:760px){
  .topbar{height:62px;padding:0 15px}.brand{font-size:.88rem}.brand svg{width:30px;height:30px}.model-badge{display:none}
  main{padding:0 15px}.intro{padding:46px 0 34px}.intro h1{font-size:2.75rem}.intro-copy>p:first-child{font-size:.95rem}
  .lab{display:block;border-right:0;border-left:0}.control-panel{border-right:0;border-bottom:1px solid var(--strong-line)}
  .workspace{padding:18px 0}.structure-head{display:block;padding:0 16px}.legend{justify-content:flex-start;margin-top:14px}.structure-stage{height:390px;margin-top:16px}
  .metrics{grid-template-columns:repeat(2,1fr);border-right:0;border-left:0}.metrics div,.metrics div:nth-child(3){border-right:1px solid var(--line);border-top:1px solid var(--line)}.metrics div:nth-child(even){border-right:0}.metrics div:first-child,.metrics div:nth-child(2){border-top:0}.metrics div:last-child{grid-column:1/-1;border-right:0}
  .analysis-grid{margin-top:18px;border-right:0;border-left:0}figure{padding:16px}figcaption{display:block}figcaption span{display:block;margin-top:4px;text-align:left}
  .reading{grid-template-columns:1fr;gap:38px;padding:70px 0}.reading-title h2{font-size:2rem}.tabs{margin-top:28px}.formula-list>div,.comparison>div,.experiment-list li{grid-template-columns:1fr;gap:5px}
  footer{display:block;padding:24px 15px}footer p+p{margin-top:8px}.structure-stage::before{display:none}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}