:root{
  --paper:#F5EEE0;
  --paper-raised:#EEE4CE;
  --paper-deep:#E3D5B3;
  --ink:#221C13;
  --ink-soft:#6E6350;
  --ink-faint:#948968;
  --accent:#0E6B5A;
  --accent-ink:#093B31;
  --accent-soft:#DCE9E1;
  --amber:#9A6B18;
  --amber-soft:#EFE1BE;
  --brick:#9A4430;
  --brick-soft:#EFDCD3;
  --line:#D8C9A3;
  --radius:6px;
  --radius-sm:3px;
  --shadow-sm:0 2px 10px rgba(34,28,19,.06);
  --shadow-md:0 10px 30px rgba(34,28,19,.10);
  color-scheme: light;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Hanken Grotesk","Segoe UI",sans-serif;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{
  font-family:"Syne","Hanken Grotesk",sans-serif;
  font-weight:700;
  color:var(--ink);
  text-wrap:balance;
  margin:0;
}
a{color:var(--accent-ink);}
code,.mono{font-family:"IBM Plex Mono",Consolas,monospace;}
::selection{background:var(--accent-soft);}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}

.eyebrow{
  font-family:"IBM Plex Mono",monospace;
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--accent-ink);
  display:block;
  margin-bottom:.6rem;
}

/* corner-tick "blueprint" motif */
.blueprint{position:relative;}
.blueprint::before,.blueprint::after{
  content:"";position:absolute;width:11px;height:11px;
  border-color:var(--ink);border-style:solid;opacity:.3;pointer-events:none;
}
.blueprint::before{top:-1px;left:-1px;border-width:1.5px 0 0 1.5px;}
.blueprint::after{bottom:-1px;right:-1px;border-width:0 1.5px 1.5px 0;}

/* ---------- Topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:20;
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1180px;margin:0 auto;padding:.9rem 2rem;
  display:flex;align-items:center;justify-content:space-between;gap:1.5rem;
}
.brand{display:flex;align-items:center;gap:.55rem;font-family:"Syne",sans-serif;font-weight:700;font-size:1.05rem;letter-spacing:-.01em;text-decoration:none;color:var(--ink);}
.brand .mark{width:20px;height:20px;flex:none;}
.topnav{display:flex;gap:1.5rem;overflow-x:auto;scrollbar-width:none;}
.topnav::-webkit-scrollbar{display:none;}
.topnav a{
  font-family:"IBM Plex Mono",monospace;font-size:.76rem;text-transform:uppercase;letter-spacing:.05em;
  color:var(--ink-soft);text-decoration:none;white-space:nowrap;border-bottom:2px solid transparent;padding-bottom:.15rem;
}
.topnav a:hover{color:var(--accent-ink);border-color:var(--accent);}
.btn{
  font-family:"IBM Plex Mono",monospace;font-size:.78rem;letter-spacing:.03em;
  padding:.55rem 1.1rem;border-radius:var(--radius);border:1px solid var(--ink);
  background:var(--ink);color:var(--paper);cursor:pointer;white-space:nowrap;
  transition:transform .12s ease, background .12s ease, box-shadow .12s ease;
  text-decoration:none;display:inline-flex;align-items:center;gap:.4rem;
}
.btn:hover{background:var(--accent-ink);border-color:var(--accent-ink);box-shadow:var(--shadow-sm);}
.btn:active{transform:translateY(1px);}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn.ghost:hover{background:var(--ink);color:var(--paper);}
.btn.small{padding:.4rem .8rem;font-size:.72rem;}

main{max-width:1180px;margin:0 auto;padding:0 2rem;}
.section{padding:5.5rem 0;}
.section-raised{
  background:var(--paper-raised);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  margin:0 calc(-50vw + 50%);padding-left:calc(50vw - 50%);padding-right:calc(50vw - 50%);
}
.section-head{max-width:62ch;margin-bottom:2.6rem;}
.section-head h2{font-size:clamp(1.6rem,3.4vw,2.1rem);margin-bottom:.7rem;}
.section-head p{color:var(--ink-soft);font-size:1.02rem;margin:0;}

/* ---------- Page breadcrumb (multi-page nav) ---------- */
.page-tabs{display:flex;gap:.5rem;flex-wrap:wrap;padding:1.6rem 0 0;}
.page-tab{
  display:flex;align-items:baseline;gap:.5rem;font-family:"IBM Plex Mono",monospace;font-size:.78rem;
  padding:.6rem 1rem;border:1px solid var(--line);border-radius:var(--radius);color:var(--ink-soft);
  text-decoration:none;background:var(--paper);transition:border-color .15s ease, background .15s ease, color .15s ease;
}
.page-tab .n{color:var(--ink-faint);}
.page-tab:hover{border-color:var(--accent);color:var(--accent-ink);}
.page-tab[aria-current="page"]{background:var(--ink);color:var(--paper);border-color:var(--ink);}
.page-tab[aria-current="page"] .n{color:var(--paper-raised);}

/* ---------- Page hero (sub-pages) ---------- */
.page-hero{padding:2.6rem 0 3.2rem;}
.page-hero h1{font-size:clamp(2rem,4.4vw,2.9rem);line-height:1.06;margin:.9rem 0 1rem;letter-spacing:-.01em;}
.page-hero p.lede{font-size:1.08rem;color:var(--ink-soft);max-width:60ch;margin:0;}

/* ---------- Hero (home) ---------- */
.hero{padding:5.5rem 0 4rem;}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:3rem;align-items:center;}
.hero h1{font-size:clamp(2.5rem,5.4vw,3.8rem);line-height:1.04;margin-bottom:1.3rem;letter-spacing:-.015em;}
.hero h1 em{font-style:normal;color:var(--accent-ink);}
.hero p.lede{font-size:1.18rem;color:var(--ink-soft);max-width:46ch;margin-bottom:1.9rem;}
.hero-ctas{display:flex;gap:.8rem;flex-wrap:wrap;margin-bottom:2rem;}
.hero-facts{display:flex;gap:1.6rem;flex-wrap:wrap;}
.hero-facts div{font-family:"IBM Plex Mono",monospace;font-size:.78rem;color:var(--ink-soft);}
.hero-facts strong{display:block;font-family:"Syne",sans-serif;font-size:1.3rem;color:var(--ink);font-weight:700;}
.hero-visual{display:flex;justify-content:center;}
.hero-visual svg{width:100%;max-width:400px;height:auto;}
.pulse{stroke-dasharray:6 10;animation:dash 3.2s linear infinite;}
@keyframes dash{to{stroke-dashoffset:-160;}}
@media (prefers-reduced-motion:reduce){.pulse{animation:none;}}

/* ---------- Scroll reveal ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease, transform .6s ease;}
.reveal.in{opacity:1;transform:translateY(0);}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none;}}

/* ---------- Demo panel ---------- */
.tabs{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1.4rem;}
.tab{
  font-family:"IBM Plex Mono",monospace;font-size:.78rem;padding:.55rem 1rem;
  border:1px solid var(--line);background:var(--paper);color:var(--ink-soft);
  border-radius:var(--radius);cursor:pointer;
}
.tab[aria-selected="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink);}
.demo-panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1.8rem;box-shadow:var(--shadow-sm);}
.demo-query{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  padding-bottom:1.3rem;margin-bottom:1.5rem;border-bottom:1px dashed var(--line);
}
.demo-query .q{font-family:"IBM Plex Mono",monospace;font-size:.95rem;}
.demo-query .q span{color:var(--ink-faint);}
.demo-actions{display:flex;gap:.6rem;}

.stepper{display:flex;flex-wrap:wrap;align-items:center;gap:0;margin-bottom:1.6rem;}
.step{
  display:flex;flex-direction:column;align-items:center;gap:.35rem;
  padding:.6rem .5rem;min-width:84px;opacity:.35;transition:opacity .25s ease;
}
.step .dot{
  width:34px;height:34px;border-radius:var(--radius-sm);border:1.5px solid var(--ink-soft);
  display:flex;align-items:center;justify-content:center;font-family:"IBM Plex Mono",monospace;
  font-size:.72rem;font-weight:600;background:var(--paper);color:var(--ink-soft);position:relative;
}
.step .name{font-family:"IBM Plex Mono",monospace;font-size:.68rem;color:var(--ink-faint);text-align:center;letter-spacing:.02em;}
.step.tool .dot{border-color:var(--ink-soft);}
.step.llm .dot{border-color:var(--accent);}
.step.gate .dot{border-color:var(--amber);}
.step.active{opacity:1;}
.step.active.tool .dot{background:var(--ink-soft);color:var(--paper);}
.step.active.llm .dot{background:var(--accent);border-color:var(--accent);color:#fff;}
.step.active.gate .dot{background:var(--amber);border-color:var(--amber);color:#fff;}
.step.done{opacity:.9;}
.step.skipped{opacity:.25;}
.step.skipped .name{text-decoration:line-through;}
.step .retry-tag{position:absolute;top:-9px;right:-9px;background:var(--brick);color:#fff;font-size:.55rem;padding:1px 4px;border-radius:2px;}
.connector{width:22px;height:1.5px;background:var(--line);flex:none;margin-bottom:1.35rem;}

.demo-body{display:grid;grid-template-columns:1.4fr 1fr;gap:1.2rem;margin-bottom:1.4rem;}
.console,.state-box{background:var(--ink);border-radius:var(--radius);padding:1rem 1.1rem;min-height:190px;}
.console-head{font-family:"IBM Plex Mono",monospace;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:#B9C9C2;margin-bottom:.6rem;}
.console-lines{font-family:"IBM Plex Mono",monospace;font-size:.82rem;color:#DCE9E1;line-height:1.7;}
.console-lines .ln{opacity:0;animation:fadein .3s ease forwards;}
@keyframes fadein{to{opacity:1;}}
.console-lines .ln::before{content:"› ";color:var(--accent);}
.state-lines{font-family:"IBM Plex Mono",monospace;font-size:.8rem;color:#F0D9A6;white-space:pre-wrap;word-break:break-word;margin:0;}

.answer-panel{
  border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem 1.5rem;
  background:var(--accent-soft);display:none;
}
.answer-panel.show{display:block;}
.answer-panel .badge-row{display:flex;gap:.6rem;margin-bottom:.8rem;flex-wrap:wrap;}
.badge{font-family:"IBM Plex Mono",monospace;font-size:.7rem;padding:.25rem .6rem;border-radius:var(--radius-sm);background:var(--paper);border:1px solid var(--line);}
.badge.pass{color:var(--accent-ink);border-color:var(--accent);}
.badge.warn{color:var(--amber);border-color:var(--amber);}
.answer-text{font-size:1.02rem;}
.answer-text .cite{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--accent-ink);vertical-align:super;}

/* ---------- Node cards ---------- */
.node-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;}
.node-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1.15rem 1.3rem;transition:box-shadow .15s ease, transform .15s ease;}
.node-card:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px);}
.node-card .idx{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--accent-ink);display:block;margin-bottom:.5rem;}
.node-card h3{font-size:1.02rem;margin-bottom:.4rem;}
.node-card p{color:var(--ink-soft);font-size:.92rem;margin:0 0 .6rem;}
.node-card summary{cursor:pointer;font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--ink-faint);letter-spacing:.03em;}
.node-card details[open] summary{color:var(--accent-ink);}
.node-card .detail{font-size:.86rem;color:var(--ink-soft);margin-top:.5rem;line-height:1.55;}

/* ---------- Diagram / tables ---------- */
.diagram-frame{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem;overflow-x:auto;margin-bottom:1.4rem;}
.diagram-frame pre.mermaid{margin:0;min-width:620px;}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);}
table{width:100%;border-collapse:collapse;font-size:.9rem;}
th,td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--line);vertical-align:top;}
th{font-family:"IBM Plex Mono",monospace;font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-faint);background:var(--paper-raised);}
tbody tr:hover{background:var(--paper-raised);}

/* ---------- Stats ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1rem;}
.stat-card{background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.3rem;transition:box-shadow .15s ease, transform .15s ease;}
.stat-card:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px);}
.stat-card .num{font-family:"Syne",sans-serif;font-size:2rem;font-weight:700;color:var(--accent-ink);display:block;}
.stat-card .label{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.03em;display:block;margin:.3rem 0 .4rem;}
.stat-card p{margin:0;font-size:.85rem;color:var(--ink-soft);}

/* ---------- Stack ---------- */
.stack-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;}
.stack-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.1rem;}
.stack-card h3{font-family:"IBM Plex Mono",monospace;font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--accent-ink);margin-bottom:.6rem;font-weight:600;}
.tagrow{display:flex;flex-wrap:wrap;gap:.4rem;}
.tag{font-family:"IBM Plex Mono",monospace;font-size:.72rem;padding:.28rem .55rem;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper-raised);color:var(--ink-soft);}

footer.site-footer{border-top:1px solid var(--line);padding:2.2rem 0 3rem;color:var(--ink-faint);font-size:.85rem;}
.footer-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;margin-bottom:1.4rem;}
.footer-pages{display:flex;gap:1.4rem;flex-wrap:wrap;}
.footer-pages a{font-family:"IBM Plex Mono",monospace;font-size:.76rem;color:var(--ink-soft);text-decoration:none;}
.footer-pages a:hover{color:var(--accent-ink);}
.footer-meta{display:flex;justify-content:space-between;flex-wrap:wrap;gap:.8rem;padding-top:1.2rem;border-top:1px dashed var(--line);}

/* ---------- Try It Yourself ---------- */
.try-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;margin-bottom:1.2rem;}
.try-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1.3rem 1.4rem;}
.try-card h3{font-size:1.02rem;margin-bottom:.4rem;}
.try-card p.desc{color:var(--ink-soft);font-size:.9rem;margin:0 0 1rem;}
.file-row{display:flex;align-items:center;justify-content:space-between;gap:.8rem;padding:.7rem 0;border-top:1px dashed var(--line);}
.file-row:first-of-type{border-top:none;}
.file-row .fname{font-family:"IBM Plex Mono",monospace;font-size:.82rem;}
.file-row .fmeta{display:block;font-size:.74rem;color:var(--ink-faint);margin-top:.15rem;font-family:"Hanken Grotesk",sans-serif;}
.save-note{font-size:.76rem;color:var(--ink-faint);margin-top:.9rem;}

.upload-zone{
  display:block;border:1.5px dashed var(--ink-soft);border-radius:var(--radius);
  padding:1.6rem;text-align:center;cursor:pointer;background:var(--paper-raised);
  transition:border-color .15s ease, background .15s ease;
}
.upload-zone:hover,.upload-zone.drag{border-color:var(--accent);background:var(--accent-soft);}
.upload-zone input{display:none;}
.upload-zone .up-title{font-family:"IBM Plex Mono",monospace;font-size:.85rem;margin-bottom:.3rem;}
.upload-zone .up-sub{font-size:.78rem;color:var(--ink-faint);}

.chunk-summary{
  display:flex;gap:1.6rem;flex-wrap:wrap;margin:1.1rem 0;font-family:"IBM Plex Mono",monospace;font-size:.78rem;color:var(--ink-soft);
}
.chunk-summary strong{display:block;font-family:"Syne",sans-serif;font-size:1.15rem;color:var(--accent-ink);font-weight:700;}
.chunk-list{max-height:280px;overflow-y:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);}
.chunk-item{padding:.7rem .9rem;border-bottom:1px solid var(--line);font-size:.85rem;}
.chunk-item:last-child{border-bottom:none;}
.chunk-item .chead{display:flex;justify-content:space-between;font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--accent-ink);margin-bottom:.3rem;}
.chunk-item .ctext{color:var(--ink-soft);}
.try-error{color:var(--brick);font-size:.85rem;margin-top:.8rem;}

.code-block{
  background:var(--ink);color:#EFE7D4;border-radius:var(--radius);padding:1.2rem 1.3rem;
  font-family:"IBM Plex Mono",monospace;font-size:.84rem;line-height:1.9;position:relative;overflow-x:auto;
}
.code-block #cmdText{white-space:pre;display:block;padding-right:3.5rem;}
.code-block .comment{color:#9C9179;}
.copy-btn{
  position:absolute;top:.7rem;right:.7rem;font-family:"IBM Plex Mono",monospace;font-size:.68rem;
  padding:.3rem .6rem;border-radius:var(--radius-sm);background:transparent;color:#EFE7D4;
  border:1px solid #4A4433;cursor:pointer;
}
.copy-btn:hover{border-color:var(--accent);color:#fff;}

/* ---------- Dataset example cards ---------- */
.example-toolbar{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1.4rem;}
.filter-chip{
  font-family:"IBM Plex Mono",monospace;font-size:.74rem;padding:.4rem .8rem;border-radius:999px;
  border:1px solid var(--line);background:var(--paper);color:var(--ink-soft);cursor:pointer;
}
.filter-chip[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink);}
.example-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1rem;margin-bottom:2rem;}
.example-card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.1rem 1.2rem;transition:box-shadow .15s ease, transform .15s ease;
}
.example-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);}
.example-card .cat{
  font-family:"IBM Plex Mono",monospace;font-size:.66rem;text-transform:uppercase;letter-spacing:.06em;
  color:var(--accent-ink);background:var(--accent-soft);display:inline-block;padding:.2rem .55rem;border-radius:var(--radius-sm);margin-bottom:.6rem;
}
.example-card .cat.fictional{color:var(--amber);background:var(--amber-soft);}
.example-card h4{font-family:"Syne",sans-serif;font-size:.95rem;font-weight:700;margin:0 0 .5rem;}
.example-card .snippet{font-size:.86rem;color:var(--ink-soft);line-height:1.6;margin:0 0 .6rem;}
.example-card .srcline{font-family:"IBM Plex Mono",monospace;font-size:.7rem;color:var(--ink-faint);}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .try-grid{grid-template-columns:1fr;}
  .hero-grid{grid-template-columns:1fr;}
  .hero-visual{order:-1;max-width:260px;margin:0 auto;}
  .demo-body{grid-template-columns:1fr;}
  .topnav{display:none;}
}