/* GaP — Graph-as-Policy · light engineering-document theme
   Archivo (display) · IBM Plex Sans (body) · IBM Plex Mono (labels)          */

:root{
  --bg:#f6f7f9; --bg2:#eef0f3; --panel:#ffffff; --panel2:#f2f4f6;
  --border:#e2e5ea; --border2:#cdd3da;
  --text:#161a20; --sub:#525a65; --faint:#8b929c;
  --ok:#2e7d32; --ok-bright:#57b05b; --fail:#c0392b; --tool:#2c6fb0; --router:#c8841a;
  --dark:#12161d; --dark2:#1b212a; --dark-border:#39424e;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --sans:"IBM Plex Sans",system-ui,sans-serif;
  --disp:"Archivo",var(--sans);
  --wrap:1160px;
  --shadow:0 8px 30px -12px rgba(22,26,32,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);
  font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;position:relative;
  background-image:radial-gradient(1100px 460px at 75% -120px,#ffffff 0%,transparent 60%);}
a{color:var(--ok);text-decoration:none}
a:hover{text-decoration:underline}
.mono{font-family:var(--mono)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 4vw}
h1,h2,h3{font-family:var(--disp);margin:0}
em{font-style:italic}
code{font-family:var(--mono);font-size:.9em;background:var(--panel2);border:1px solid var(--border);border-radius:6px;padding:1px 7px}

/* ── nav ─────────────────────────────────────────────────────────────── */
#topnav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:26px;
  padding:10px 4vw;background:rgba(246,247,249,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--disp);font-weight:900;
  font-size:20px;color:var(--text);letter-spacing:.5px}
.brand:hover{text-decoration:none}
.navlinks{display:flex;gap:20px;margin-left:auto}
.navlinks a{color:var(--sub);font-family:var(--mono);font-size:13.5px}
.navlinks a:hover{color:var(--text);text-decoration:none}
.navgh{font-family:var(--mono);font-size:13.5px;border:1px solid var(--border2);
  border-radius:9px;padding:6px 14px;color:var(--text);background:var(--panel)}
.navgh:hover{border-color:var(--ok);text-decoration:none}

/* ── spine (control-flow line down the page) ─────────────────────────── */
.spine{position:absolute;top:0;bottom:0;width:2px;left:calc(50% - 580px - 34px);
  background:linear-gradient(180deg,transparent 0,var(--ok) 340px,var(--ok) calc(100% - 400px),transparent);
  opacity:.22;pointer-events:none}
@media (max-width:1290px){.spine{display:none}}

/* ── hero ────────────────────────────────────────────────────────────── */
.hero{padding-top:64px;text-align:left}
.hero h1{font-size:clamp(36px,4.4vw,64px);font-weight:900;letter-spacing:-.8px;
  line-height:1.05;font-stretch:110%}
.tagline{font-size:clamp(17px,1.6vw,21px);color:var(--sub);max-width:880px;margin:14px 0 0}
.tagline em{color:var(--text);font-style:normal;border-bottom:2.5px solid var(--ok-bright)}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{font-family:var(--mono);font-size:12.5px;color:var(--sub);
  border:1px solid var(--border2);background:var(--panel);border-radius:9px;padding:4px 12px;white-space:nowrap}
.chip-green{color:#1f6b24;border-color:#9ccc9f;background:#eef7ee}
.chip-amber{color:#8a5f10;border-color:#e0c48a;background:#faf3e3}
.authors{margin-top:34px;max-width:1050px}
.authors p{margin:0;color:#39404a;font-size:15.5px;line-height:1.75}
.authors sup{color:var(--faint);font-size:.72em}
.authors .affil{color:var(--faint);margin-top:8px;font-size:14px}
.logos{display:flex;align-items:center;flex-wrap:wrap;gap:34px;margin-top:28px}
.logos img{display:block}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{font-family:var(--mono);font-size:14px;color:var(--text);border:1px solid var(--border2);
  background:var(--panel);border-radius:11px;padding:10px 18px;cursor:pointer;transition:.18s}
.btn:hover{border-color:var(--ok);transform:translateY(-1px);text-decoration:none}
.btn-primary{background:#eef7ee;border-color:#9ccc9f;color:#1f6b24}
.btn-disabled{opacity:.45;cursor:not-allowed;pointer-events:none}
.btn-mini{padding:4px 12px;font-size:12.5px;border-radius:8px;background:transparent;color:#606770;border-color:var(--border2)}
.btn-mini:hover{border-color:var(--ok);color:var(--ok)}
.splash{margin:44px 0 0}
.splash video{width:100%;display:block;border-radius:18px;border:1px solid var(--border2);
  box-shadow:0 30px 70px -24px rgba(22,26,32,.35)}
figcaption,.caption{color:var(--faint);font-size:14px;margin-top:12px}
.caption a{color:var(--sub);text-decoration:underline}

/* ── sections / lane titles ──────────────────────────────────────────── */
section.wrap{padding-top:96px;padding-bottom:10px;position:relative}
.lane-title{position:relative;margin-bottom:22px}
.lane-title .dot{position:absolute;left:-41px;top:14px;width:12px;height:12px;border-radius:50%;
  background:var(--bg);border:3px solid var(--ok)}
@media (max-width:1290px){.lane-title .dot{display:none}}
.lt-chip{display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:1.5px;
  text-transform:uppercase;color:#1f6b24;border:1px solid #9ccc9f;background:#eef7ee;
  border-radius:8px;padding:4px 12px;margin-bottom:14px}
.lane-title h2{font-size:clamp(30px,3.6vw,46px);font-weight:800;letter-spacing:-.6px;font-stretch:105%}
.lead{color:var(--sub);max-width:940px;font-size:17.5px}
.lead b{color:var(--text)}

/* ── cards ───────────────────────────────────────────────────────────── */
.triple{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}
.quad{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:34px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:22px 24px;
  box-shadow:var(--shadow)}
.card h3{font-size:19px;font-weight:700;margin:12px 0 8px}
.card p{margin:0;color:var(--sub);font-size:15.5px}
.card-hl{border-color:#9ccc9f;background:linear-gradient(180deg,#f3faf3,var(--panel))}
.callout{margin-top:26px;border-left:3px solid var(--router);background:var(--panel);
  border-radius:0 14px 14px 0;padding:18px 24px;color:var(--sub);font-size:15.5px;max-width:1020px;
  box-shadow:var(--shadow)}
.callout b{color:var(--text)}

/* ── prompt (kept dark — the terminal moment) + artifact cards ───────── */
.prompt-card{display:flex;align-items:center;gap:16px;margin-top:34px;
  background:var(--dark2);border:1px solid var(--dark-border);border-radius:14px;padding:18px 22px}
.prompt-card .chip-green{color:#b4e0b6;border-color:#3c6b3f;background:#16241a}
.ptext{font-size:clamp(16px,2vw,23px);color:#eef1f5}
.cursor{display:inline-block;width:11px;height:1.25em;background:#78c87c;vertical-align:text-bottom;
  animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.statusline{color:var(--sub);font-size:14.5px;margin:14px 0 0 6px}
.statusline::first-letter{color:var(--ok)}
.artifact{background:#fff;border-radius:18px;margin-top:22px;overflow:hidden;
  border:1px solid var(--border2);box-shadow:0 24px 60px -26px rgba(22,26,32,.28)}
.artifact-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 18px;border-bottom:1px solid var(--border);background:var(--panel2)}
.asrc{font-size:12.5px;color:#7a8089}
#graph-svg-holder{padding:10px 14px 4px}
#graph-svg-holder svg{width:100%;height:auto;display:block}
.legend{display:flex;flex-wrap:wrap;gap:20px;padding:10px 18px 14px;font-size:12.5px;color:#5b616b}
.legend .sw{display:inline-block;width:14px;height:11px;border:1.6px solid;border-radius:4px;
  vertical-align:-1px;margin-right:7px}
.legend .sw.line{height:3px;border:none;border-radius:2px;vertical-align:2px}
.tip{position:fixed;z-index:80;background:#14181e;color:#e8ecf1;border:1px solid var(--dark-border);
  border-radius:9px;padding:8px 12px;font-size:12.5px;pointer-events:none;max-width:320px;
  box-shadow:0 10px 30px rgba(0,0,0,.35)}
.tip b{color:#9fd4a2}

/* graph svg element styles */
.g-lane{fill:#fbfbfd;stroke:#c8c8d0;stroke-width:1.4}
.g-lane-t{font-family:var(--mono);font-size:15px;fill:#6a6a74}
.g-node rect{stroke-width:2}
.g-node text{font-family:var(--mono);text-anchor:middle;pointer-events:none}
.g-node .nm{font-size:14.5px;fill:#1c1c22;font-weight:600}
.g-node .sb{font-size:10.5px;fill:#555560}
.g-node{cursor:pointer}
.g-node:hover rect,.g-node.sel rect{filter:brightness(.93)}
.g-node.sel rect{stroke-width:3.5}
.g-edge{fill:none;stroke-linecap:round}
.gv{opacity:0;transform:translateY(7px);transition:opacity .45s ease,transform .45s ease}
.gv.on{opacity:1;transform:none}

/* node inspector */
.detail{border-top:1px solid var(--border);background:var(--panel2);padding:18px 22px;display:none}
.detail.open{display:block}
.detail-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.detail-head .nchip{font-family:var(--mono);font-weight:600;font-size:15px;border-radius:9px;
  padding:5px 14px;border:2px solid}
.detail-head .tchip{font-family:var(--mono);font-size:12px;color:#6a707a;background:#fff;
  border:1px solid var(--border2);border-radius:8px;padding:3px 10px}
.detail-close{margin-left:auto}
.detail h4{font-family:var(--mono);font-size:12px;letter-spacing:1px;text-transform:uppercase;
  color:#8a919b;margin:16px 0 8px}
.kv{display:grid;grid-template-columns:max-content 1fr;gap:6px 18px;font-family:var(--mono);
  font-size:13px;overflow-x:auto}
.kv .k{color:#4a5563}
.kv .v{color:#20242b;word-break:break-all}
.kv .v .ref{color:var(--tool)}
.detail pre{background:#fff;border:1px solid var(--border);border-radius:10px;padding:14px 16px;
  font-size:12.5px;line-height:1.5;max-height:340px;overflow:auto;margin:0;color:#282e36}
.detail .hint{color:#8a919b;font-size:13px;margin:8px 0 0}

/* ── split sim|real ──────────────────────────────────────────────────── */
.split{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:44px}
.vidpanel{position:relative;margin:0}
.vidpanel video{width:100%;display:block;border-radius:16px;border:1px solid var(--border2);
  box-shadow:var(--shadow)}
.vidpanel.small{max-width:560px}
.corner-chip{position:absolute;z-index:2;top:14px;left:14px;font-family:var(--mono);font-size:12px;letter-spacing:1px;
  background:rgba(14,17,22,.82);border:1px solid #39424e;color:#cfe3f7;
  border-radius:8px;padding:4px 11px}
.corner-chip.chip-greenish{color:#b4e0b6;border-color:#3c6b3f}

/* ── self-learning (simple) ──────────────────────────────────────────── */
.figcard{background:#fff;border-radius:16px;padding:14px;margin:0;border:1px solid var(--border2);
  box-shadow:var(--shadow)}
.figcard img{width:100%;display:block;border-radius:8px}
.figcard figcaption{color:#6c727c;padding:10px 6px 2px}
.figcard.wide{margin-top:36px}

/* ── benchmark grid ──────────────────────────────────────────────────── */
.bench-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:40px}
.bcard{background:var(--panel);border:1px solid var(--border);border-radius:18px;overflow:hidden;
  transition:border-color .2s,box-shadow .2s;box-shadow:var(--shadow)}
.bcard:hover{border-color:var(--border2);box-shadow:0 16px 44px -18px rgba(22,26,32,.28)}
.bmedia{aspect-ratio:16/9.6;background:#0b0d10;overflow:hidden}
.bmedia video{width:100%;height:100%;object-fit:cover;display:block}
.bmeta{display:flex;align-items:center;gap:12px;padding:16px 20px 0}
.bnum{font-family:var(--mono);color:var(--ok);font-size:13px}
.bmeta h3{font-size:19px;font-weight:700;margin-right:auto}
.bcard p{color:var(--sub);font-size:14.5px;margin:8px 0 0;padding:0 20px 18px}
.btabs{display:flex;flex-wrap:wrap;gap:6px;padding:12px 14px 0}
.btab{font-family:var(--mono);font-size:12px;background:transparent;color:var(--sub);
  border:1px solid var(--border2);border-radius:8px;padding:5px 11px;cursor:pointer}
.btab.active{color:#1f6b24;border-color:#9ccc9f;background:#eef7ee}
.statstack{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-content:start}
.stat{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:20px 20px;
  box-shadow:var(--shadow)}
.stat b{display:block;font-family:var(--disp);font-size:44px;font-weight:900;color:var(--ok);line-height:1}
.stat span{color:var(--sub);font-size:13.5px;line-height:1.45;display:block;margin-top:8px}

/* variation clips */
.varrow{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.varrow figure{margin:0;background:var(--panel);border:1px solid var(--border);border-radius:14px;
  overflow:hidden;box-shadow:var(--shadow)}
.varrow video{width:100%;display:block;background:#fff}
.varrow figcaption{padding:10px 14px 12px;font-size:13px}

/* ── results tables ──────────────────────────────────────────────────── */
.rtabs{display:flex;flex-wrap:wrap;gap:8px;margin:36px 0 0}
.rtab{font-family:var(--mono);font-size:13px;background:var(--panel);color:var(--sub);
  border:1px solid var(--border2);border-radius:9px;padding:8px 16px;cursor:pointer}
.rtab.active{color:#1f6b24;border-color:#9ccc9f;background:#eef7ee}
.rpanel{margin-top:18px}
.tnote{font-family:var(--mono);color:var(--faint);font-size:12.5px;max-width:900px}
.tscroll{overflow-x:auto;border:1px solid var(--border);border-radius:14px;background:var(--panel);
  box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:640px}
th,td{text-align:left;padding:11px 16px;border-bottom:1px solid var(--border);white-space:nowrap}
th{font-family:var(--mono);font-size:12px;letter-spacing:.4px;color:var(--faint);text-transform:uppercase}
tbody tr:last-child td{border-bottom:none}
tr.hl td{background:#edf6ee}
tr.hl td:first-child{color:#1f6b24;font-weight:600}
td b{color:var(--text)}
.findings{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:40px}
.find{display:flex;gap:14px;background:var(--panel);border:1px solid var(--border);
  border-radius:14px;padding:16px 18px;box-shadow:var(--shadow)}
.find span{color:var(--ok);font-size:17px}
.find p{margin:0;color:var(--sub);font-size:14.5px}
.find b{color:var(--text)}

/* ── bibtex / footer ─────────────────────────────────────────────────── */
#bibtex .artifact pre{margin:0;padding:20px 24px;font-family:var(--mono);font-size:13px;
  line-height:1.55;color:#333a44;overflow-x:auto}
footer{margin-top:110px;border-top:1px solid var(--border);background:var(--bg2);padding:44px 0 60px}
footer .logos{gap:28px;opacity:.85;margin-top:6px}
footer p{color:var(--faint);font-size:13.5px;margin:20px 0 0}
footer a{color:var(--sub)}
.faint{opacity:.7}

/* ── reveal on scroll ────────────────────────────────────────────────── */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease var(--d,0s),transform .7s ease var(--d,0s)}
.reveal.in{opacity:1;transform:none}

/* ── responsive ──────────────────────────────────────────────────────── */
@media (max-width:980px){
  .triple,.quad,.bench-grid,.findings,.split,.varrow{grid-template-columns:1fr}
  .navlinks{display:none}
  .hero{padding-top:44px}
  section.wrap{padding-top:70px}
  .statstack{grid-template-columns:1fr 1fr}
  .logos{gap:22px}
  .logos img{height:auto;max-height:40px;max-width:26vw;object-fit:contain}
  .kv{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  .reveal{transition:none;opacity:1;transform:none}
  .gv{transition:none}
  .cursor{animation:none}
  html{scroll-behavior:auto}
}