:root{
  --bg:#0a0d13; --bg2:#0d1119;
  --surface:rgba(24,30,42,.62); --surface-solid:#141a25; --surface2:rgba(32,40,55,.55);
  --ink:#e9eef7; --muted:#9aa7ba; --faint:#697587;
  --hairline:rgba(255,255,255,.08); --hairline-2:rgba(255,255,255,.14);
  --accent:#7aa2ff; --draft:#e0a64e;
  --serif:ui-serif,"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --radius:18px; --ease:cubic-bezier(.16,1,.3,1);
  --shadow:0 24px 60px -28px rgba(0,0,0,.78);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--sans); font-size:16px; line-height:1.6;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  min-height:100vh; overflow-x:hidden;
}
.ambient{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(120vw 80vh at 14% -8%, rgba(122,162,255,.16), transparent 60%),
    radial-gradient(100vw 70vh at 92% 8%, rgba(217,177,78,.10), transparent 55%),
    radial-gradient(120vw 90vh at 70% 110%, rgba(182,146,255,.12), transparent 60%),
    linear-gradient(180deg,var(--bg2),var(--bg));
}
.vignette{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(120vw 100vh at 50% 30%, transparent 40%, rgba(0,0,0,.5) 100%);}
.skip{position:absolute;left:-999px;top:0;background:var(--surface-solid);
  color:var(--ink);padding:10px 16px;border-radius:8px;z-index:50}
.skip:focus{left:16px;top:16px}
a{color:inherit}
button{font-family:inherit}

/* ---- shell ---- */
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
header.top{position:sticky;top:0;z-index:30;
  backdrop-filter:blur(18px) saturate(130%);
  background:linear-gradient(180deg,rgba(10,13,19,.86),rgba(10,13,19,.5));
  border-bottom:1px solid var(--hairline)}
.top .wrap{display:flex;align-items:center;gap:18px;height:68px}
.brand{display:flex;align-items:baseline;gap:12px;cursor:pointer;border:0;background:none;color:inherit;padding:0}
.brand .mark{font-family:var(--serif);font-size:21px;font-weight:600;letter-spacing:.2px}
.brand .mark .em{color:var(--accent)}
.brand .sub{font-size:11px;letter-spacing:2.4px;text-transform:uppercase;color:var(--faint)}
.spacer{flex:1}
.topnav-link{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--muted);padding:8px 15px;border:1px solid var(--hairline);border-radius:999px;text-decoration:none;white-space:nowrap;transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease)}
.topnav-link:hover{color:var(--ink);border-color:var(--hairline-2);background:var(--surface)}
.topnav-link .tn-go{color:var(--accent);margin-left:1px;transition:transform .2s var(--ease)}
.topnav-link:hover .tn-go{transform:translateX(3px)}
@media(max-width:520px){.topnav-link{padding:7px 11px;font-size:12px}}
.chip{display:inline-flex;align-items:center;gap:7px;font-size:11.5px;
  letter-spacing:.6px;padding:6px 12px;border-radius:999px;border:1px solid var(--hairline-2)}
.chip .dot{width:7px;height:7px;border-radius:50%;background:currentColor}
.chip.draft{color:var(--draft);border-color:rgba(224,166,78,.4);
  background:rgba(224,166,78,.08)}
.chip.tone{color:var(--accent);border-color:color-mix(in oklab,var(--accent) 45%,transparent);
  background:color-mix(in oklab,var(--accent) 12%,transparent)}

/* ---- hero ---- */
.hero{padding:64px 0 26px}
.hero .eyebrow{font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.hero h1{font-family:var(--serif);font-weight:600;line-height:1.04;margin:0;
  font-size:clamp(2.6rem,1.4rem+4.4vw,4.6rem);letter-spacing:-.5px}
.hero h1 .accent{background:linear-gradient(120deg,var(--accent),#b692ff);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lede{font-size:clamp(1.05rem,.96rem+.5vw,1.3rem);color:var(--muted);
  max-width:62ch;margin:22px auto 0}
.statbar{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.stat{padding:16px 20px;border-radius:14px;background:var(--surface);
  border:1px solid var(--hairline);box-shadow:inset 0 1px 0 rgba(255,255,255,.05);min-width:120px}
.stat b{display:block;font-family:var(--serif);font-size:1.9rem;line-height:1}
.stat span{font-size:11.5px;letter-spacing:.8px;text-transform:uppercase;color:var(--faint)}
.safety-note{margin-top:24px;font-size:13.5px;color:var(--faint);max-width:74ch;
  padding-left:14px;border-left:2px solid var(--hairline-2)}

/* ---- glass panels ---- */
.glass{position:relative;background:linear-gradient(158deg,rgba(255,255,255,.055),rgba(255,255,255,.012));
  backdrop-filter:blur(16px) saturate(120%);border:1px solid var(--hairline);
  border-radius:var(--radius);box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.06)}
.glass::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;pointer-events:none;
  background:linear-gradient(160deg,color-mix(in oklab,var(--accent) 40%,transparent),transparent 38%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;opacity:.7}

/* ---- domain grid ---- */
.section-h{font-family:var(--serif);font-size:1.5rem;margin:48px 0 4px;font-weight:600}
.section-sub{color:var(--muted);margin:0 0 26px;font-size:14.5px}
.domain-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;padding-bottom:20px}
.domain-card{--accent:#7aa2ff;text-align:left;cursor:pointer;border:1px solid var(--hairline);
  background:var(--surface);border-radius:var(--radius);padding:22px 22px 20px;
  color:inherit;position:relative;overflow:hidden;transition:transform .4s var(--ease),border-color .4s,box-shadow .4s}
.domain-card::after{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--accent);opacity:.85}
.domain-card:hover{transform:translateY(-4px);border-color:color-mix(in oklab,var(--accent) 50%,var(--hairline));
  box-shadow:0 30px 60px -30px color-mix(in oklab,var(--accent) 40%,#000)}
.domain-card:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.domain-card h3{font-family:var(--serif);font-size:1.32rem;margin:0 0 8px;font-weight:600}
.domain-card p{margin:0 0 16px;color:var(--muted);font-size:13.6px;line-height:1.55}
.domain-card .meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.pill{font-size:11.5px;letter-spacing:.4px;padding:5px 11px;border-radius:999px;
  background:color-mix(in oklab,var(--accent) 14%,transparent);
  border:1px solid color-mix(in oklab,var(--accent) 35%,transparent);color:var(--ink)}
.pill.ghost{background:transparent;border-color:var(--hairline);color:var(--faint)}
.req-tag{font-size:10px;letter-spacing:1.4px;text-transform:uppercase;color:var(--faint)}

/* ---- domain rail (sub-nav) ---- */
.rail{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 30px}
.rail button{--accent:#7aa2ff;cursor:pointer;border:1px solid var(--hairline);background:var(--surface);
  color:var(--muted);border-radius:999px;padding:8px 15px;font-size:13px;display:flex;gap:8px;align-items:center;
  transition:.25s var(--ease)}
.rail button .dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}
.rail button[aria-current="true"]{color:var(--ink);border-color:color-mix(in oklab,var(--accent) 55%,transparent);
  background:color-mix(in oklab,var(--accent) 12%,transparent)}
.rail button:hover{color:var(--ink)}

/* ---- module cards ---- */
.mod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px}
.mod-card{--accent:#7aa2ff;text-align:left;cursor:pointer;color:inherit;border:1px solid var(--hairline);
  background:var(--surface);border-radius:var(--radius);padding:22px;position:relative;overflow:hidden;
  transition:transform .4s var(--ease),border-color .4s,box-shadow .4s;min-height:180px;display:flex;flex-direction:column}
.mod-card:hover{transform:translateY(-4px);border-color:color-mix(in oklab,var(--accent) 50%,var(--hairline));
  box-shadow:0 30px 60px -32px color-mix(in oklab,var(--accent) 45%,#000)}
.mod-card:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.mod-card .kicker{font-size:11px;letter-spacing:1.6px;text-transform:uppercase;color:var(--accent);margin-bottom:9px}
.mod-card h3{font-family:var(--serif);font-size:1.28rem;margin:0 0 10px;font-weight:600;line-height:1.2}
.mod-card .snippet{color:var(--muted);font-size:13.4px;line-height:1.5;flex:1}
.mod-card .foot{display:flex;gap:8px;align-items:center;margin-top:16px;flex-wrap:wrap}
.src-chip{font-size:10.5px;letter-spacing:.5px;padding:4px 9px;border-radius:6px;border:1px solid var(--hairline);color:var(--faint)}
.src-chip.guide{color:var(--accent);border-color:color-mix(in oklab,var(--accent) 40%,transparent)}
.src-chip.video{color:#5fd2c2;border-color:rgba(95,210,194,.4)}

/* ---- reader ---- */
.reader-head{padding:40px 0 8px}
.back{background:none;border:0;color:var(--muted);cursor:pointer;font-size:13.5px;display:inline-flex;gap:8px;align-items:center;padding:6px 0;margin-bottom:18px}
.back:hover{color:var(--ink)}
.reader-head h1{font-family:var(--serif);font-weight:600;font-size:clamp(2rem,1.3rem+2.4vw,3.1rem);margin:6px 0 14px;line-height:1.08}
.reader-meta{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.reader{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:26px;padding:18px 0 80px;align-items:start}
.col-rail{position:sticky;top:88px;display:flex;flex-direction:column;gap:18px}
.panel{padding:24px;margin-bottom:18px}
.panel .eyebrow{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--accent);margin-bottom:14px;display:flex;align-items:center;gap:9px}
.panel .eyebrow::before{content:"";width:18px;height:2px;background:var(--accent);border-radius:2px}
.panel h2{font-family:var(--serif);font-weight:600;font-size:1.45rem;margin:0 0 14px}
.lead-concept{font-size:1.18rem;line-height:1.6;color:var(--ink);font-family:var(--serif)}
ul.pearls{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:11px}
ul.pearls li{position:relative;padding-left:24px;color:var(--ink);font-size:14.6px;line-height:1.55}
ul.pearls li::before{content:"";position:absolute;left:0;top:9px;width:9px;height:9px;border-radius:3px;
  background:color-mix(in oklab,var(--accent) 80%,transparent);box-shadow:0 0 0 4px color-mix(in oklab,var(--accent) 16%,transparent)}
ul.pearls.danger li::before{background:#ff7a8a;box-shadow:0 0 0 4px rgba(255,122,138,.16)}
ul.pearls.check li::before{content:"✓";background:none;box-shadow:none;color:var(--accent);font-size:13px;top:1px;font-weight:700}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:12.5px;padding:6px 11px;border-radius:8px;background:var(--surface2);border:1px solid var(--hairline)}

/* pause & think */
.pause{padding:22px 24px;border-left:3px solid var(--accent);
  background:linear-gradient(120deg,color-mix(in oklab,var(--accent) 9%,transparent),transparent)}
.pause .eyebrow{color:var(--accent)}
.pause .q{font-family:var(--serif);font-size:1.16rem;margin:6px 0 14px}

/* quiz */
.quiz{display:flex;flex-direction:column;gap:14px}
.qcard{padding:18px 20px;border-radius:14px;background:var(--surface2);border:1px solid var(--hairline)}
.qcard .qtype{font-size:10px;letter-spacing:1.4px;text-transform:uppercase;color:var(--faint)}
.qcard .qq{font-weight:600;margin:6px 0 12px;font-size:15px}
.reveal-btn{cursor:pointer;border:1px solid color-mix(in oklab,var(--accent) 40%,transparent);
  background:color-mix(in oklab,var(--accent) 10%,transparent);color:var(--ink);
  padding:8px 14px;border-radius:9px;font-size:13px;transition:.2s}
.reveal-btn:hover{background:color-mix(in oklab,var(--accent) 18%,transparent)}
.answer{margin-top:13px;padding-top:13px;border-top:1px dashed var(--hairline-2);display:none}
.answer.show{display:block}
.answer .a{color:var(--ink);font-weight:600;margin-bottom:6px}
.answer .ex{color:var(--muted);font-size:13.4px}
.answer .ev{margin-top:8px;font-size:10.5px;letter-spacing:.6px;text-transform:uppercase;color:var(--faint)}

/* tables */
.tbl-wrap{overflow-x:auto;border-radius:12px;border:1px solid var(--hairline)}
table{border-collapse:collapse;width:100%;font-size:13.6px}
caption{caption-side:top;text-align:left;color:var(--faint);font-size:12px;padding:10px 12px 8px;letter-spacing:.4px}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--hairline);vertical-align:top}
thead th{background:color-mix(in oklab,var(--accent) 10%,transparent);color:var(--ink);font-weight:600;
  border-bottom:1px solid color-mix(in oklab,var(--accent) 30%,transparent)}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(255,255,255,.03)}

/* visuals */
.visual{margin:0 0 16px;border-radius:14px;overflow:hidden;border:1px solid var(--hairline);background:rgba(0,0,0,.18)}
.visual svg{display:block;width:100%;height:auto}
.visual figcaption{font-size:12px;color:var(--faint);padding:10px 14px;border-top:1px solid var(--hairline)}

/* further reading */
details.deep{border:1px solid var(--hairline);border-radius:14px;background:var(--surface2);overflow:hidden}
details.deep summary{cursor:pointer;padding:16px 20px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
details.deep summary::-webkit-details-marker{display:none}
details.deep summary .hint{font-size:11px;color:var(--faint);font-weight:400}
details.deep[open] summary{border-bottom:1px solid var(--hairline)}
details.deep .body{padding:16px 20px;font-size:13.6px;color:var(--muted)}
details.deep .body code{font-family:var(--mono);font-size:12px;background:rgba(255,255,255,.05);padding:2px 6px;border-radius:5px;color:var(--ink)}
.q-list{display:flex;flex-direction:column;gap:8px;margin-top:10px}

/* provenance / side rail */
.prov h4{font-family:var(--serif);margin:0 0 12px;font-size:1.05rem}
.prov .row{display:flex;justify-content:space-between;font-size:13px;padding:7px 0;border-bottom:1px solid var(--hairline)}
.prov .row:last-child{border-bottom:0}
.prov .row span:last-child{color:var(--muted)}
.review-flags{margin-top:12px;font-size:12.5px;color:var(--draft)}
.review-flags li{margin-bottom:5px}
.warn-banner{font-size:12.8px;color:var(--draft);background:rgba(224,166,78,.08);
  border:1px solid rgba(224,166,78,.3);border-radius:12px;padding:13px 16px}

footer.foot{padding:40px 0 60px;color:var(--faint);font-size:12.5px;border-top:1px solid var(--hairline);margin-top:30px}

/* motion — pure CSS entrance; content is ALWAYS visible (never JS-gated to
   hidden), so nothing can disappear if a script or observer fails. */
@keyframes nrft-in{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.reveal{animation:nrft-in .55s var(--ease) both}
.domain-grid .reveal:nth-child(2),.mod-grid .reveal:nth-child(2){animation-delay:.05s}
.domain-grid .reveal:nth-child(3),.mod-grid .reveal:nth-child(3){animation-delay:.1s}
.domain-grid .reveal:nth-child(n+4),.mod-grid .reveal:nth-child(n+4){animation-delay:.15s}
.col-main .reveal:nth-child(2){animation-delay:.06s}
.col-main .reveal:nth-child(3){animation-delay:.12s}
.col-main .reveal:nth-child(n+4){animation-delay:.18s}

@media (max-width:960px){
  .reader{grid-template-columns:1fr}
  .col-rail{position:static}
}
@media (max-width:560px){
  .wrap{padding:0 18px}
  .hero{padding:42px 0 18px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1!important;transform:none!important}
  .ambient{background:linear-gradient(180deg,var(--bg2),var(--bg))}
}