/* AITIA demo — guided story. Causis Research visual system: warm paper, soft-black + crimson, DM Sans / Cormorant. */
:root {
  --bg:#FAF8F4; --bg2:#F3EEE6; --panel:#FCFAF6; --panel2:#FFFFFF; --line:#E5E0D7;
  --ink:#1A1A1A; --ink-dim:#5A5754; --ink-faint:#938C82;
  --law:#1A1A1A;          /* equation text — ink (Causis black) */
  --engine:#8B1A2F;       /* the brand accent — Causis crimson */
  --bad:#b06a4f18; --bad-ink:#A8674C;   /* fooled / wrong — muted clay */
  --good:#8B1A2F;         /* verified = the brand recovers it (crimson) */
  --accent:#8B1A2F;
  --mono:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --sans:"DM Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --serif:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --shadow:0 1px 2px rgba(26,26,26,.04), 0 14px 34px rgba(26,26,26,.05);
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0; background-color:var(--bg);
  background-image:radial-gradient(rgba(26,26,26,.045) 1px, transparent 1px);
  background-size:24px 24px; background-attachment:fixed;
  color:var(--ink); font-family:var(--sans); font-weight:400; line-height:1.6; -webkit-font-smoothing:antialiased;
}
a { color:var(--engine); }
.wrap { max-width:760px; margin:0 auto; padding:0 24px; }

/* ---------- top bar + bottom bar (Causis chrome, full-width unlike the 760px content) ---------- */
.topbar { position:sticky; top:0; z-index:50; border-bottom:.5px solid #E0DDD8; background:rgba(250,248,244,.82); backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px); }
.topbar-in, .botbar-in { max-width:1400px; margin:0 auto; padding-left:clamp(20px,4vw,56px); padding-right:clamp(20px,4vw,56px); }
.topbar-in { display:flex; align-items:center; justify-content:space-between; min-height:64px; }
.brand { display:flex; align-items:center; gap:8px; }
.brand-mark { width:28px; height:28px; display:block; flex:0 0 auto; }
.brand-name { font-family:var(--sans); font-weight:400; font-size:26px; line-height:1; letter-spacing:-.05em; color:#1A1A1A; white-space:nowrap; }
.brand-tag { font-family:var(--mono); font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--ink-faint); border:1px solid var(--line); border-radius:999px; padding:5px 13px; white-space:nowrap; }
.botbar { border-top:.5px solid var(--line); background:var(--bg2); }
.botbar-in { display:flex; align-items:center; justify-content:space-between; gap:16px 24px; flex-wrap:wrap; padding-top:26px; padding-bottom:30px; }
.brand-name-sm { font-size:20px; }
.botbar-legal { font-family:var(--mono); font-size:11px; letter-spacing:.07em; color:var(--ink-faint); }
@media (max-width:560px) { .brand-name { font-size:22px; } }

/* ---------- hero ---------- */
header.hero { padding:18vh 0 12vh; text-align:center; }
.hero .mark { font-family:var(--mono); letter-spacing:.5em; color:var(--engine); font-size:13px; text-transform:uppercase; }
.hero h1 { font-size:clamp(34px,6vw,62px); line-height:1.06; margin:.35em 0 .3em; font-weight:300; letter-spacing:-.025em; }
.hero h1 em { color:var(--engine); font-style:normal; }
.hero p.sub { font-size:clamp(16px,2.4vw,21px); color:var(--ink-dim); max-width:580px; margin:0 auto; font-weight:400; }
.hero .scrollcue { margin-top:48px; color:var(--ink-faint); font-size:13px; font-family:var(--mono); animation:bob 2.4s ease-in-out infinite; }
@keyframes bob { 0%,100%{transform:translateY(0)} 50%{transform:translateY(7px)} }

/* ---------- scene scaffold ---------- */
.scene { padding:11vh 0; border-top:1px solid var(--line); opacity:0; transform:translateY(22px); transition:opacity .7s ease, transform .7s ease; }
.scene.in { opacity:1; transform:none; }
.kicker { display:flex; align-items:baseline; justify-content:space-between; gap:12px; font-family:var(--mono); font-size:12px; letter-spacing:.28em; text-transform:uppercase; color:var(--ink-faint); }
.kicker b { color:var(--engine); font-weight:600; }
.thread { flex:0 0 auto; font-family:var(--mono); font-size:10px; letter-spacing:.1em; text-transform:uppercase; padding:3px 9px; border-radius:999px; border:1px solid var(--line); color:var(--ink-faint); background:#fff; }
.thread.causal { color:var(--engine); border-color:#8b1a2f3d; background:#8b1a2f0c; }
.thread.stream { color:var(--ink); border-color:#1a1a1a26; background:#1a1a1a08; }
.thread.both { color:var(--ink-dim); }
.scene h2 { font-size:clamp(26px,3.6vw,38px); margin:.25em 0 .2em; letter-spacing:-.02em; font-weight:300; }
.takeaway { font-family:var(--serif); font-style:italic; font-weight:500; font-size:24px; line-height:1.4; color:var(--ink); margin:.1em 0 .55em; max-width:660px; }
.claim { font-size:16px; color:var(--ink-dim); margin:0 0 26px; max-width:620px; }
.gloss { color:var(--ink-faint); font-size:13px; font-style:italic; margin-top:7px; }
.gloss b { color:var(--ink-dim); font-weight:600; font-style:normal; }
.sketch { display:flex; gap:18px; align-items:center; margin-top:14px; flex-wrap:wrap; }
.sketch .scurve { width:190px; flex:0 0 auto; height:auto; }
.sketch .gloss { flex:1 1 240px; margin:0; }
.buildblocks { color:var(--ink-dim); font-size:13.5px; max-width:600px; margin:14px auto 0; line-height:1.6; }
.buildblocks b { color:var(--ink); font-weight:600; }
.etymon { font-family:var(--mono); font-size:12.5px; letter-spacing:.04em; color:var(--ink-faint); margin-top:12px; }
.etymon .gk { color:var(--engine); font-family:var(--serif); font-style:italic; font-size:17px; letter-spacing:0; }
.namestory { color:var(--ink-dim); font-size:14px; max-width:610px; margin:0 auto 16px; line-height:1.65; }
.namestory b { color:var(--ink); font-weight:600; } .namestory .gk { color:var(--engine); font-family:var(--serif); font-style:italic; font-size:16px; } .namestory em { color:var(--engine); font-style:normal; }
.values { display:flex; gap:11px; flex-wrap:wrap; justify-content:center; margin-top:30px; }
.value { font-family:var(--mono); font-size:12.5px; color:var(--ink-dim); border:1px solid var(--line); border-radius:999px; padding:8px 15px; background:#fff; }
.value b { color:var(--engine); font-weight:600; }
.caption { margin-top:22px; color:var(--ink-dim); font-size:15px; }
.caption b { color:var(--ink); font-weight:600; }
.fromcase { font-family:var(--mono); font-size:12px; letter-spacing:.02em; color:var(--ink-faint); margin:6px 0 2px; }
.fromcase b { color:var(--ink-dim); font-weight:600; }
.handoff { text-align:center; font-family:var(--mono); font-size:13px; letter-spacing:.06em; color:var(--engine); margin-top:28px; }
.mr-slider { margin:14px 0; }
.mr-slider label { display:block; font-size:13px; color:var(--ink-dim); margin-bottom:7px; }
.mr-slider label b { color:var(--engine); font-family:var(--mono); font-weight:600; }
.mr-slider input[type=range] { width:100%; accent-color:var(--engine); cursor:pointer; }
.mr-read { margin-top:16px; font-size:14px; color:var(--ink-dim); border-top:1px solid var(--line); padding-top:13px; }
.mr-read b { color:var(--ink); font-family:var(--mono); font-weight:600; }
.mr-meta { margin-top:8px; font-family:var(--mono); font-size:11px; letter-spacing:.01em; color:var(--ink-faint); line-height:1.55; }
.mr-meta b { color:var(--ink-dim); font-weight:600; }
.mr-panel { margin-top:16px; font-family:var(--mono); font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-faint); }
.mr-reads { display:flex; flex-wrap:wrap; gap:6px; margin-top:8px; }
.mr-chip { font-family:var(--mono); font-size:12px; color:var(--ink); border:1px solid #8b1a2f3d; border-radius:6px; padding:3px 9px; background:#8b1a2f0c; }
.mr-chip.miss { color:var(--ink-faint); font-style:italic; border-color:var(--line); background:transparent; }

/* ---------- stage / cards ---------- */
.stage { background:var(--panel); border:1px solid var(--line); border-radius:16px; padding:22px; box-shadow:var(--shadow); }
.row { display:flex; gap:14px; flex-wrap:wrap; }
.card { flex:1 1 200px; background:var(--panel2); border:1px solid var(--line); border-radius:12px; padding:16px; min-width:0; box-shadow:0 1px 2px rgba(26,26,26,.04); }
.card h3 { margin:0 0 4px; font-size:14px; letter-spacing:.01em; font-weight:600; }
.card .who { font-family:var(--mono); font-size:11px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-faint); }
.eq { font-family:var(--mono); font-size:15px; color:var(--law); background:#FBF8F1; border:1px solid var(--line); border-radius:8px; padding:11px 13px; overflow-x:auto; white-space:nowrap; }
.eq.small { font-size:13px; white-space:normal; word-break:break-word; }
.eq .x { color:var(--bad-ink); font-weight:600; text-decoration:underline; text-decoration-color:#a8674c88; text-underline-offset:3px; } /* a fooled / spurious term */
.eq .hill { color:var(--engine); }
.muted { color:var(--ink-faint); font-size:13px; }

/* badges */
.badge { display:inline-flex; align-items:center; gap:6px; font-family:var(--mono); font-size:12px; padding:3px 9px; border-radius:999px; border:1px solid var(--line); }
.badge.ok { color:var(--good); border-color:#8b1a2f3d; background:#8b1a2f0f; }
.badge.no { color:var(--bad-ink); border-color:#a8674c40; background:var(--bad); }
.badge.dim { color:var(--ink-faint); }
.arrow { align-self:center; color:var(--engine); font-size:26px; flex:0 0 auto; }

/* metric chips */
.metrics { display:flex; gap:10px; flex-wrap:wrap; margin-top:14px; }
.metric { background:#FBF8F1; border:1px solid var(--line); border-radius:10px; padding:9px 13px; }
.metric .v { font-family:var(--mono); font-size:19px; color:var(--ink); }
.metric .v.good { color:var(--good); } .metric .v.bad { color:var(--bad-ink); }
.metric .k { font-size:11px; color:var(--ink-faint); letter-spacing:.03em; }

button.run { margin-top:18px; font-family:var(--mono); font-size:12px; letter-spacing:.12em; text-transform:uppercase; color:#fff;
  background:var(--engine); border:0; border-radius:8px; padding:12px 22px; cursor:pointer; transition:filter .2s, opacity .2s; }
button.run:hover { filter:brightness(1.1); } button.run:disabled { opacity:.4; cursor:default; }
.lab-ctrl { display:flex; gap:10px; flex-wrap:wrap; }
.lab-ctrl .run { margin-top:0; }
.run.lab-ghost { background:transparent; color:var(--engine); border:1px solid #8b1a2f3d; }
.run.lab-ghost:hover { background:#8b1a2f0f; filter:none; }
.lab-stats { font-family:var(--mono); font-size:13px; color:var(--ink-dim); }
.lab-stats b { color:var(--ink); font-weight:600; }
canvas { display:block; width:100%; height:auto; border-radius:10px; }
.loading { display:flex; align-items:center; justify-content:center; gap:12px; min-height:140px; color:var(--ink-faint); font-family:var(--mono); font-size:13px; letter-spacing:.05em; }
.spinner { width:20px; height:20px; border:2px solid #8b1a2f33; border-top-color:var(--engine); border-radius:50%; animation:spin .8s linear infinite; flex:0 0 auto; }
@keyframes spin { to { transform:rotate(360deg); } }

/* use cases */
.usegrid { display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.use { background:var(--panel2); border:1px solid var(--line); border-radius:12px; padding:16px; box-shadow:0 1px 2px rgba(26,26,26,.04); }
.use h3 { margin:0 0 6px; font-size:15px; font-weight:600; color:var(--ink); letter-spacing:-.01em; }
.use p { margin:0; font-size:13.5px; color:var(--ink-dim); line-height:1.55; }
@media (max-width:560px) { .usegrid { grid-template-columns:1fr; } }

/* origin / lineage */
.lineage .strands { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.strand { border:1px solid var(--line); border-top-width:3px; border-radius:12px; padding:15px 16px; background:var(--panel2); box-shadow:0 1px 2px rgba(26,26,26,.04); }
.strand.causal { border-top-color:var(--engine); }
.strand.stream { border-top-color:var(--ink); }
.strand-name { font-family:var(--mono); font-size:13px; letter-spacing:.06em; font-weight:600; color:var(--ink); }
.strand.causal .strand-name { color:var(--engine); }
.strand-sub { font-size:12px; color:var(--ink-faint); margin-top:3px; }
.strand-do { font-size:13px; color:var(--ink-dim); margin-top:10px; line-height:1.5; }
.weave { width:100%; height:46px; display:block; margin:0; overflow:visible; }
.weave path { fill:none; stroke-width:1.5; }
.weave .w-causal { stroke:var(--engine); }
.weave .w-stream { stroke:var(--ink); }
.aitia-node { text-align:center; max-width:440px; margin:0 auto; padding:14px 18px; border:1px solid var(--line); border-radius:12px; background:#FBF8F1; }
.aitia-node b { display:block; font-family:var(--mono); letter-spacing:.42em; color:var(--engine); font-size:15px; }
.aitia-node span { display:block; font-size:12.5px; color:var(--ink-dim); margin-top:6px; }
@media (max-width:560px) { .lineage .strands { grid-template-columns:1fr; } .weave { height:30px; } }

/* model card */
.modelcard { display:flex; flex-direction:column; gap:28px; }
.mc-spec { display:grid; grid-template-columns:120px 1fr; gap:13px 22px; margin:0; }
.mc-spec dt { font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint); padding-top:2px; }
.mc-spec dd { margin:0; font-size:15px; color:var(--ink-dim); line-height:1.5; }
.mc-spec dd b { color:var(--ink); font-weight:600; }
.mc-block h3 { font-family:var(--mono); font-size:11px; letter-spacing:.18em; text-transform:uppercase; color:var(--engine); font-weight:600; margin:0 0 13px; padding-bottom:9px; border-bottom:1px solid var(--line); }
.mc-p { margin:0; font-size:15px; color:var(--ink-dim); line-height:1.6; max-width:640px; }
.mc-p b { color:var(--ink); font-weight:600; }
.mc-list { list-style:none; margin:0; padding:0; display:grid; gap:11px; }
.mc-list li { font-size:15px; color:var(--ink-dim); line-height:1.5; padding-left:18px; position:relative; }
.mc-list li::before { content:""; position:absolute; left:0; top:9px; width:5px; height:5px; background:var(--engine); border-radius:1px; }
.mc-list li b { color:var(--ink); font-weight:600; }
@media (min-width:560px) { .mc-list.two { grid-template-columns:1fr 1fr; gap:11px 26px; } }
.mc-meta { font-family:var(--mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-faint); padding-top:18px; border-top:1px solid var(--line); }
@media (max-width:560px) { .mc-spec { grid-template-columns:1fr; gap:4px 0; } .mc-spec dd { margin-bottom:10px; } }

/* SEE law stream */
.lawstream .eq { font-size:16px; transition:color .3s; }
.nbar { display:flex; align-items:center; gap:10px; margin-top:6px; font-family:var(--mono); font-size:12px; color:var(--ink-faint); }
.nbar .track { flex:1; height:5px; background:#ECE5DA; border-radius:3px; overflow:hidden; }
.nbar .fill { height:100%; width:0; background:linear-gradient(90deg,var(--engine),var(--ink)); transition:width .5s ease; }

footer { text-align:center; padding:8vh 0 12vh; color:var(--ink-faint); font-size:13px; border-top:1px solid var(--line); }
footer .eqn { font-family:var(--mono); color:var(--ink-dim); }
.legend { display:flex; gap:16px; flex-wrap:wrap; font-size:12px; color:var(--ink-dim); margin-top:10px; font-family:var(--mono); }
.legend i { display:inline-block; width:18px; height:3px; border-radius:2px; vertical-align:middle; margin-right:6px; }