:root{
  --bg:#EEF1F4; --surface:#E3E8EE; --ink:#16233B; --muted:#56637A;
  --accent:#0F7C7A; --trace:#16233B; --trace-soft:rgba(22,35,59,.18); --rule:#C9D1DB;
  --serif:"Literata", Georgia, "Times New Roman", serif;
  --sans:"Schibsted Grotesk", "Helvetica Neue", Arial, sans-serif;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0E1A2B; --surface:#15243A; --ink:#E4E9F0; --muted:#9AA8BD;
    --accent:#4FC2B8; --trace:#4FC2B8; --trace-soft:rgba(79,194,184,.18); --rule:#26374F;
  }
}
:root[data-theme="dark"]{
  --bg:#0E1A2B; --surface:#15243A; --ink:#E4E9F0; --muted:#9AA8BD;
  --accent:#4FC2B8; --trace:#4FC2B8; --trace-soft:rgba(79,194,184,.18); --rule:#26374F;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-behavior:smooth;scroll-padding-top:calc(env(safe-area-inset-top,0px) + 4.5rem)}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--serif);font-size:1.125rem;line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:var(--accent);text-underline-offset:.2em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

.wrap{max-width:46rem;margin:0 auto;padding:0 1.5rem}

/* Navigation */
nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:3.75rem}
.brand{font-family:var(--sans);font-weight:800;font-size:1rem;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
nav ul{display:flex;gap:1.25rem;list-style:none;margin:0;padding:0;overflow-x:auto;scrollbar-width:none}
nav ul::-webkit-scrollbar{display:none}
nav ul a{font-family:var(--sans);font-weight:500;font-size:.9rem;color:var(--muted);text-decoration:none;white-space:nowrap}
nav ul a:hover{color:var(--ink)}
@media (max-width:40rem){.brand{display:none} nav .wrap{justify-content:flex-start}}

/* Hero */
header.hero{padding:4.5rem 0 1rem}
h1{font-family:var(--sans);font-weight:800;font-size:clamp(2.75rem,8vw,4.5rem);line-height:1;letter-spacing:-.035em;margin:0 0 1.25rem}
.lede{font-size:1.3rem;line-height:1.55;max-width:36rem;margin:0 0 .75rem}
.affil{font-family:var(--sans);font-size:.95rem;color:var(--muted);margin:0}

.scope{margin:2.5rem auto 0;max-width:62rem;padding:0 1.5rem}
.scope-frame{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);position:relative}
canvas{display:block;width:100%;height:190px}
.scope-controls{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem 1.5rem;padding:.9rem 0 0;font-family:var(--sans);font-size:.9rem;color:var(--muted)}
.scope-controls label{display:flex;align-items:center;gap:.75rem;flex:1 1 18rem}
.scope-controls output{font-weight:700;color:var(--ink);min-width:4.5rem;font-variant-numeric:tabular-nums}
input[type=range]{flex:1;accent-color:var(--accent);min-width:8rem}
.scope-note{margin:.35rem 0 0;font-family:var(--sans);font-size:.85rem;color:var(--muted)}

/* Sections */
section{padding:4rem 0 0}
h2{font-family:var(--sans);font-weight:700;font-size:1.75rem;letter-spacing:-.02em;line-height:1.2;margin:0 0 1.25rem}
h3{font-family:var(--sans);font-weight:700;font-size:1.1rem;letter-spacing:-.01em;margin:0 0 .35rem}
p{margin:0 0 1.1rem}

.axes{margin:0;padding:0;list-style:none;border-top:1px solid var(--rule)}
.axes li{padding:1.4rem 0;border-bottom:1px solid var(--rule)}
.axes p{margin:0;color:var(--ink)}

.methods{background:var(--surface);padding:1.25rem 1.5rem;border-radius:6px;margin-top:1.75rem}
.methods p{margin:0;font-size:1rem}

.teach{list-style:none;padding:0;margin:0}
.teach li{padding:.55rem 0 .55rem 1.25rem;position:relative}
.teach li::before{content:"";position:absolute;left:0;top:1.3em;width:.5rem;height:2px;background:var(--accent)}

.profiles{display:flex;flex-wrap:wrap;gap:.75rem;margin:1.5rem 0 0;padding:0;list-style:none}
.profiles a{display:inline-block;font-family:var(--sans);font-weight:500;font-size:.95rem;padding:.55rem 1rem;border:1px solid var(--rule);border-radius:999px;text-decoration:none;color:var(--ink)}
.profiles a:hover{border-color:var(--accent);color:var(--accent)}

.pubs{padding-left:1.25rem;margin:1.5rem 0 0}
.pubs li{margin-bottom:.9rem;font-size:1rem}

address{font-style:normal}
footer{margin-top:5rem;padding:2rem 0 3rem;border-top:1px solid var(--rule);font-family:var(--sans);font-size:.85rem;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem}
.theme-toggle{background:none;border:1px solid var(--rule);color:var(--muted);font:inherit;padding:.3rem .8rem;border-radius:999px;cursor:pointer}
.theme-toggle:hover{color:var(--ink);border-color:var(--ink)}

nav ul a[aria-current="page"]{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:.45em;text-decoration-thickness:2px}
.links{display:flex;flex-wrap:wrap;gap:.5rem .75rem;margin:1.75rem 0 0;padding:0;list-style:none}
.links a{display:inline-block;font-family:var(--sans);font-weight:500;font-size:.9rem;padding:.45rem .9rem;border:1px solid var(--rule);border-radius:999px;text-decoration:none;color:var(--ink)}
.links a:hover{border-color:var(--accent);color:var(--accent)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:1rem;margin-top:1.5rem}
.card{display:block;padding:1.25rem;border:1px solid var(--rule);border-radius:8px;text-decoration:none;color:var(--ink);background:var(--bg)}
.card:hover{border-color:var(--accent)}
.card h3{margin-bottom:.4rem}
.card p{margin:0;font-size:.95rem;color:var(--muted);line-height:1.5}
.card span{display:inline-block;margin-top:.75rem;font-family:var(--sans);font-size:.85rem;color:var(--accent)}
.page-head{padding:4rem 0 0}
.page-head h1{font-size:clamp(2.25rem,6vw,3.25rem)}
.book{background:var(--surface);padding:1.25rem 1.5rem;border-radius:6px;margin-top:1.5rem}
.book p{margin:0;font-size:1rem}

.scope-controls .end{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em}
.iaf-state{flex-basis:100%;margin:0;font-weight:700;color:var(--ink);transition:color .2s}
.iaf-state[data-slow="1"]{color:var(--accent)}