@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600&display=swap");

:root{
  --bg:#101416;
  --panel:#171d1f;
  --panel-2:#1d2528;
  --text:#f2f0e9;
  --muted:#b7c0c2;
  --line:#374246;
  --accent:#ffa56f;
  --accent-2:#8cc9ff;
  --wrap:min(1240px,calc(100% - 48px));
  --surface:var(--panel);
  --surface2:var(--panel-2);
  --ink:var(--text);
  --blue:var(--accent-2);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:"DM Sans",system-ui,sans-serif;line-height:1.6}
a{color:inherit}
button,input,select{font:inherit}
button,select{color:inherit}
.skip{position:fixed;left:16px;top:-80px;background:var(--accent);color:#101416;padding:10px 14px;z-index:100}
.skip:focus{top:16px}
:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
.wrap{width:var(--wrap);margin-inline:auto}
.site-header{height:82px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:28px;padding-inline:max(24px,calc((100vw - 1240px)/2));position:sticky;top:0;background:rgba(16,20,22,.94);backdrop-filter:blur(12px);z-index:30}
.brand{text-decoration:none;font-family:"Space Grotesk";font-size:1.05rem}
.brand span{color:var(--accent)}
.site-header nav{margin-left:auto;display:flex;gap:24px}
.site-header nav a{text-decoration:none;color:var(--muted);font-size:.88rem}
.site-header nav a:hover{color:var(--text)}
.hero{min-height:690px;display:grid;grid-template-columns:1.08fr .92fr;gap:70px;align-items:center;padding-block:70px}
.eyebrow{color:var(--accent);font-size:.75rem;letter-spacing:.15em;text-transform:uppercase;font-weight:700}
h1,h2,h3{font-family:"Space Grotesk";font-weight:500;line-height:1.05}
h1{font-size:clamp(3.4rem,7vw,7rem);letter-spacing:-.06em;margin:.25em 0}
h1 em{font-style:normal;color:var(--accent)}
h2{font-size:clamp(2.4rem,4.5vw,4.8rem);letter-spacing:-.05em;margin:.2em 0}
h3{font-size:1.45rem}
.lead{font-size:1.22rem;color:var(--muted);max-width:720px}
.callout{margin-top:30px;border-left:2px solid var(--accent);padding:18px 20px;background:var(--panel);display:grid;gap:8px;max-width:640px}
.callout code{font-size:1.05rem;color:var(--accent-2)}
.callout span{color:var(--muted);font-size:.85rem}
.state-visual{border:1px solid var(--line);min-height:500px;background:linear-gradient(145deg,var(--panel),var(--bg));display:grid;place-items:center;position:relative}
.sphere{width:min(340px,70vw);aspect-ratio:1;border:1px solid var(--line);border-radius:50%;position:relative}
.equator{position:absolute;left:5%;right:5%;top:50%;height:24%;border:1px solid var(--line);border-radius:50%;transform:translateY(-50%)}
.axis{position:absolute;top:-7%;bottom:-7%;left:50%;width:1px;background:var(--line)}
.north,.south{position:absolute;left:50%;transform:translateX(-50%);font-weight:700}
.north{top:-34px}
.south{bottom:-34px}
.center{position:absolute;left:50%;top:50%;width:10px;height:10px;border-radius:50%;background:var(--text);transform:translate(-50%,-50%)}
.state-arrow{position:absolute;left:50%;top:50%;width:4px;height:42%;background:var(--accent);transform-origin:50% 100%;transform:translate(-50%,-100%) rotate(90deg)}
.state-arrow::after{content:"";position:absolute;top:-1px;left:50%;width:14px;height:14px;border-top:3px solid var(--accent);border-right:3px solid var(--accent);transform:translate(-50%,-10%) rotate(-45deg)}
.visual-caption{position:absolute;left:20px;right:20px;bottom:18px;display:flex;justify-content:space-between;color:var(--muted);font-size:.82rem}
.section{padding-block:95px;border-top:1px solid var(--line)}
.section-heading{display:flex;justify-content:space-between;gap:40px;align-items:flex-end;margin-bottom:42px}
.section-heading>p{max-width:480px;color:var(--muted)}
.model-grid{display:grid;grid-template-columns:.9fr 1.1fr;border:1px solid var(--line)}
.controls,.probability-panel{padding:42px}
.controls{border-right:1px solid var(--line)}
.controls label{display:flex;justify-content:space-between;align-items:center}
input[type="range"]{width:100%;accent-color:var(--accent);margin:22px 0}
.presets{display:flex;gap:8px;flex-wrap:wrap}
.presets button,.experiment-controls button{border:1px solid var(--line);background:transparent;padding:11px 14px;cursor:pointer}
.presets button:hover,.experiment-controls button:hover{border-color:var(--accent)}
.state-values{margin:32px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.state-values div{background:var(--panel-2);padding:16px}
.state-values dt{font-size:.75rem;color:var(--muted)}
.state-values dd{margin:4px 0 0;font-family:"Space Grotesk";font-size:1.25rem}
.probability-row{margin-bottom:36px}
.probability-row>div:first-child{display:flex;justify-content:space-between;margin-bottom:10px}
.probability-row strong{font-size:1.2rem}
.track{height:18px;border:1px solid var(--line);background:var(--bg);overflow:hidden}
.track>div{height:100%;background:var(--accent);transition:width .18s ease}
.track.second>div{background:var(--accent-2)}
.probability-row small{display:block;margin-top:8px;color:var(--muted)}
.description{margin-top:44px;font-size:1.08rem;color:var(--muted)}
.experiment{background:var(--panel)}
.experiment-grid{display:grid;grid-template-columns:.7fr 1.3fr;gap:40px}
.experiment-controls{display:grid;align-content:start;gap:12px}
.experiment-controls select{background:var(--bg);border:1px solid var(--line);padding:12px}
.experiment-controls .primary{background:var(--accent);color:#101416;border-color:var(--accent);font-weight:700}
.results{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}
.results div{padding:28px;border-bottom:1px solid var(--line)}
.results div:nth-child(odd){border-right:1px solid var(--line)}
.results div:nth-last-child(-n+2){border-bottom:0}
.results span{display:block;color:var(--muted);font-size:.8rem}
.results strong{font-family:"Space Grotesk";font-size:2rem}
.limits-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.limits-grid article{border-top:1px solid var(--line);padding-top:22px}
.limits-grid li{margin:.7em 0;color:var(--muted)}
.footnote{color:var(--muted);margin-top:36px;border-left:2px solid var(--accent);padding-left:16px}
footer{border-top:1px solid var(--line);padding-block:28px;display:flex;gap:28px;flex-wrap:wrap;color:var(--muted);font-size:.82rem}
footer a{text-decoration:none}
@media(max-width:850px){
  :root{--wrap:min(100% - 30px,720px)}
  .site-header nav{display:none}
  .hero,.model-grid,.experiment-grid{grid-template-columns:1fr}
  .hero{padding-block:50px}
  .controls{border-right:0;border-bottom:1px solid var(--line)}
  .section-heading{display:block}
}
@media(max-width:560px){
  .state-values{grid-template-columns:1fr}
  .results,.limits-grid{grid-template-columns:1fr}
  .results div:nth-child(odd){border-right:0}
  .results div:nth-last-child(-n+2){border-bottom:1px solid var(--line)}
  .results div:last-child{border-bottom:0}
  .controls,.probability-panel{padding:24px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}

.experiment-controls input[type=number]{background:var(--bg);border:1px solid var(--line);padding:12px;color:var(--text);min-height:44px}
.convergence-chart{display:block;width:100%;height:240px;margin-top:22px;border:1px solid var(--line);background:#0b1216;border-radius:10px}
.results{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:560px){.convergence-chart{height:220px}.site-header{height:68px}.site-header+.portfolio-nav{top:68px}}


/* General pure-state controls */
.controls select{width:100%;min-height:44px;margin:8px 0 18px;background:var(--bg);color:var(--text);border:1px solid var(--line);border-radius:7px;padding:9px 10px}
.state-arrow{transition:transform .16s ease,height .16s ease;box-shadow:0 0 14px #ffa56f66}
.sphere{background:radial-gradient(circle at 42% 36%,#22313a55,transparent 55%),linear-gradient(145deg,#121d22,#0a1014)}
.sphere::before{content:"";position:absolute;inset:10%;border:1px dashed #8cc9ff38;border-radius:50%;transform:rotate(63deg) scaleY(.36)}
.state-values dd{overflow-wrap:anywhere}
@media(max-width:560px){.presets button{flex:1 1 42%;min-height:44px}.visual-caption{font-size:.72rem}}

:root[data-theme=light]{--bg:#eef2ed;--panel:#f9fbf7;--panel-2:#e3ebe6;--text:#182e2d;--muted:#475f5d;--line:#b9ccc3;--accent:#945022;--accent-2:#22667a}
:root[data-theme=light] .site-header{background:rgba(245,249,243,.95)}
:root[data-theme=light] .state-visual{background:var(--panel)}
.site-header>[data-theme-toggle]{margin-left:auto;flex-shrink:0}

/* Parent-owned display size; render resolution follows the measured chart. */
.convergence-chart{width:100%;height:auto;aspect-ratio:15/8;min-width:0;max-width:100%}