:root{
  color-scheme: light;
  --paper:#F4F6F2;
  --paper-raised:#FFFFFF;
  --ink:#1B2621;
  --muted:#5B6960;
  --pine:#1F5D4C;
  --pine-soft:#E4EEE8;
  --copper:#A85B2E;
  --copper-soft:#F3E5DA;
  --rule:#D8DED4;
  --rule-strong:#B9C4BB;
  --mono-chip:#EBEFE9;
  --code-bg:#182019;
  --code-ink:#DCE6DF;
  --code-muted:#7C8C81;
  --code-accent:#8FD6B4;
  --shadow: 0 1px 2px rgba(27,38,33,.04), 0 8px 24px -12px rgba(27,38,33,.12);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme: dark;
    --paper:#0F1512;
    --paper-raised:#161E19;
    --ink:#E8EDE7;
    --muted:#93A398;
    --pine:#5BC29C;
    --pine-soft:#17261F;
    --copper:#E4935A;
    --copper-soft:#2A2019;
    --rule:#223028;
    --rule-strong:#324338;
    --mono-chip:#182019;
    --code-bg:#0B0F0D;
    --code-ink:#DCE6DF;
    --code-muted:#5E6E64;
    --code-accent:#7BC7A2;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px -12px rgba(0,0,0,.5);
  }
}
:root[data-theme="dark"]{
  color-scheme: dark;
  --paper:#0F1512;
  --paper-raised:#161E19;
  --ink:#E8EDE7;
  --muted:#93A398;
  --pine:#5BC29C;
  --pine-soft:#17261F;
  --copper:#E4935A;
  --copper-soft:#2A2019;
  --rule:#223028;
  --rule-strong:#324338;
  --mono-chip:#182019;
  --code-bg:#0B0F0D;
  --code-ink:#DCE6DF;
  --code-muted:#5E6E64;
  --code-accent:#7BC7A2;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px -12px rgba(0,0,0,.5);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto;} *{animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important;} }

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'IBM Plex Sans', ui-sans-serif, system-ui, sans-serif;
  font-size:16px;
  line-height:1.65;
  padding:0 20px;
}
h1,h2,h3{ font-family:'IBM Plex Serif', Georgia, serif; font-weight:600; text-wrap:balance; color:var(--ink); margin:0; }
a{color:var(--pine); text-decoration:none;}
a:hover{text-decoration:underline;}
a:focus-visible, button:focus-visible{outline:2px solid var(--copper); outline-offset:2px; border-radius:2px;}
.mono{ font-family:'IBM Plex Mono', ui-monospace, 'SF Mono', Consolas, monospace; font-variant-numeric:tabular-nums; }
.wrap{max-width:920px; margin:0 auto;}
.wrap-narrow{max-width:760px; margin:0 auto;}

/* ---------- nav ---------- */
nav.top{
  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(--rule);
}
nav.top .inner{
  max-width:920px; margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
}
nav.top .brand{ font-family:'IBM Plex Mono', monospace; font-weight:600; font-size:15px; color:var(--ink); display:flex; align-items:center; gap:8px; }
nav.top .brand .glyph{color:var(--pine);}
nav.top .links{ display:flex; gap:22px; font-size:13.5px; }
nav.top .links a{ color:var(--muted); }
nav.top .links a:hover{ color:var(--ink); text-decoration:none; }
nav.top .gh{ font-family:'IBM Plex Mono', monospace; font-size:13px; padding:6px 12px; border:1px solid var(--rule-strong); border-radius:5px; color:var(--ink) !important; }
nav.top .gh:hover{ border-color:var(--pine); text-decoration:none; }
@media (max-width:720px){ nav.top .links{display:none;} }

/* ---------- hero ---------- */
.hero{ padding-block:64px 20px; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:'IBM Plex Mono', monospace; font-size:12px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--muted); margin-bottom:20px;
}
.eyebrow .dot{ width:7px; height:7px; border-radius:50%; background:var(--pine); box-shadow:0 0 0 3px var(--pine-soft); }
h1.title{ font-size:clamp(2.6rem, 6.4vw, 4rem); letter-spacing:-.015em; max-width:14ch; }
.tagline{ max-width:56ch; color:var(--muted); font-size:1.15rem; margin-top:18px; }
.hero-ctas{ display:flex; gap:12px; margin-top:30px; flex-wrap:wrap; }
.btn{
  font-family:'IBM Plex Mono', monospace; font-size:13.5px; font-weight:500;
  padding:11px 20px; border-radius:6px; display:inline-flex; align-items:center; gap:8px;
  border:1px solid transparent;
}
.btn-primary{ background:var(--pine); color:#F4F6F2 !important; }
.btn-primary:hover{ background:color-mix(in srgb, var(--pine) 85%, black); text-decoration:none; }
.btn-ghost{ border-color:var(--rule-strong); color:var(--ink) !important; }
.btn-ghost:hover{ border-color:var(--pine); text-decoration:none; }

.hero-stats{ display:flex; gap:28px 40px; flex-wrap:wrap; margin-top:44px; padding-top:28px; border-top:1px solid var(--rule); }
.hero-stats .s .n{ font-family:'IBM Plex Mono', monospace; font-size:1.5rem; font-weight:600; color:var(--pine); }
.hero-stats .s .l{ font-size:12px; color:var(--muted); margin-top:2px; }

/* ---------- tree diagram ---------- */
.diagram{ margin-top:52px; }
.diagram svg{ width:100%; height:auto; display:block; }
.diagram-cap{ text-align:center; font-size:12.5px; color:var(--muted); margin-top:10px; font-family:'IBM Plex Mono', monospace; }

/* ---------- sections ---------- */
section{ padding-block:52px; }
section + section{ border-top:1px solid var(--rule); }
.kicker{ font-family:'IBM Plex Mono', monospace; font-size:11.5px; letter-spacing:.09em; text-transform:uppercase; color:var(--copper); margin-bottom:10px; display:block; }
h2{ font-size:1.7rem; margin-bottom:14px; }
p.dek{ color:var(--muted); margin-top:-4px; margin-bottom:22px; max-width:64ch; }
section > p{ max-width:70ch; }

code.inline{ font-family:'IBM Plex Mono', monospace; background:var(--mono-chip); border-radius:3px; padding:.12em .38em; font-size:.88em; }

pre{
  background:var(--code-bg); color:var(--code-ink);
  border-radius:8px; padding:18px 20px; overflow-x:auto;
  font-family:'IBM Plex Mono', monospace; font-size:13.5px; line-height:1.7;
  box-shadow:var(--shadow);
}
pre .c{ color:var(--code-muted); }
pre .k{ color:var(--code-accent); }
.code-label{ font-family:'IBM Plex Mono', monospace; font-size:11px; letter-spacing:.06em; text-transform:uppercase; color:var(--muted); margin-bottom:8px; }

/* feature triad */
.triad{ display:grid; grid-template-columns:repeat(3,1fr); gap:0; margin-top:28px; border-top:1px solid var(--rule); }
.triad > div{ padding:22px 22px 22px 0; border-right:1px solid var(--rule); }
.triad > div:last-child{ border-right:none; }
.triad .num{ font-family:'IBM Plex Mono', monospace; color:var(--copper); font-size:13px; }
.triad h3{ font-family:'IBM Plex Sans',sans-serif; font-size:1.02rem; font-weight:600; margin:8px 0 8px; }
.triad p{ font-size:.92rem; color:var(--muted); margin:0; }
@media (max-width:720px){ .triad{grid-template-columns:1fr;} .triad>div{border-right:none; border-bottom:1px solid var(--rule); padding:18px 0;} }

/* module grid */
.modules{ display:grid; grid-template-columns:1fr 1fr; gap:6px 24px; margin-top:16px; font-size:.88rem; }
.modules div{ display:flex; justify-content:space-between; gap:10px; padding:6px 0; border-bottom:1px dashed var(--rule); }
.modules .path{ font-family:'IBM Plex Mono', monospace; color:var(--ink); }
.modules .what{ color:var(--muted); text-align:right; }
@media (max-width:620px){ .modules{grid-template-columns:1fr;} }

/* extras table */
table{ width:100%; border-collapse:collapse; margin-top:8px; font-size:.92rem; }
caption{ text-align:left; font-size:.85rem; color:var(--muted); margin-bottom:8px; caption-side:top; }
th, td{ text-align:left; padding:9px 12px; border-bottom:1px solid var(--rule); }
th{ font-family:'IBM Plex Mono', monospace; font-size:11px; letter-spacing:.05em; text-transform:uppercase; color:var(--muted); font-weight:500; }
td.num, th.num{ text-align:right; font-family:'IBM Plex Mono', monospace; font-variant-numeric:tabular-nums; }
tr.hl td{ color:var(--pine); font-weight:600; }
.table-scroll{ overflow-x:auto; }

.callout{ background:var(--pine-soft); border-left:3px solid var(--pine); padding:14px 16px; font-size:.92rem; color:var(--ink); margin-top:16px; border-radius:0 4px 4px 0; }
.callout.warn{ background:var(--copper-soft); border-left-color:var(--copper); }

/* chart */
.chart-wrap{ margin-top:20px; }
.chart-wrap svg{ width:100%; height:auto; display:block; }
.legend{ display:flex; gap:20px; margin-top:10px; font-size:12px; color:var(--muted); flex-wrap:wrap; }
.legend span{ display:inline-flex; align-items:center; gap:6px; }
.legend i{ width:10px; height:10px; border-radius:2px; display:inline-block; }

/* timeline */
.timeline{ list-style:none; margin:26px 0 0; padding:0; position:relative; }
.timeline::before{ content:""; position:absolute; left:19px; top:6px; bottom:6px; width:1px; background:var(--rule-strong); }
.phase{ position:relative; padding-left:52px; padding-bottom:28px; }
.phase:last-child{ padding-bottom:0; }
.phase .num{
  position:absolute; left:0; top:0; width:38px; height:38px; border-radius:50%;
  background:var(--paper-raised); border:1px solid var(--rule-strong);
  display:flex; align-items:center; justify-content:center;
  font-family:'IBM Plex Mono', monospace; font-size:13px; color:var(--pine); font-weight:600;
}
.phase h3{ font-family:'IBM Plex Sans', sans-serif; font-size:1rem; font-weight:600; margin-bottom:4px; }
.phase p{ margin:0; color:var(--muted); font-size:.94rem; max-width:66ch; }
.phase .hash{ font-family:'IBM Plex Mono', monospace; font-size:11.5px; color:var(--copper); margin-left:8px; }

ul.plain{ margin:10px 0 0; padding-left:0; list-style:none; }
ul.plain li{ position:relative; padding-left:20px; margin-bottom:12px; color:var(--ink); font-size:.95rem; max-width:70ch; }
ul.plain li::before{ content:"—"; position:absolute; left:0; color:var(--copper); }

footer{
  padding-block:44px 60px; margin-top:12px; border-top:1px solid var(--rule);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:16px;
}
footer .col{ font-size:13px; color:var(--muted); }
footer .col a{ color:var(--muted); }
footer .col a:hover{ color:var(--pine); }

/* ---------- badge row (hero + footer trust signals) ---------- */
.badges{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:22px; }
.badges img{ height:20px; display:block; border-radius:3px; }
.badge{
  display:inline-flex; align-items:center; gap:6px;
  font-family:'IBM Plex Mono', monospace; font-size:11.5px; font-weight:500;
  padding:5px 10px; border-radius:20px; border:1px solid var(--rule-strong);
  color:var(--muted); background:var(--paper-raised);
}
.badge .dot{ width:6px; height:6px; border-radius:50%; background:var(--pine); }

/* ---------- copy-to-clipboard install pill ---------- */
.install-pill{
  display:inline-flex; align-items:center; gap:14px;
  background:var(--code-bg); color:var(--code-ink);
  font-family:'IBM Plex Mono', monospace; font-size:14px;
  padding:12px 8px 12px 18px; border-radius:8px; box-shadow:var(--shadow);
}
.install-pill .cmd{ color:var(--code-accent); }
.install-pill button{
  font-family:'IBM Plex Mono', monospace; font-size:11.5px; cursor:pointer;
  background:transparent; border:1px solid var(--code-muted); color:var(--code-ink);
  border-radius:5px; padding:6px 10px; line-height:1;
}
.install-pill button:hover{ border-color:var(--code-accent); color:var(--code-accent); }

/* ---------- comparison table (this vs. typical vector-RAG) ---------- */
table.cmp th.this, table.cmp td.this{ color:var(--pine); font-weight:600; background:var(--pine-soft); }
table.cmp td.this{ font-weight:500; }
table.cmp caption{ margin-bottom:12px; }

/* ---------- problem strip (4-up value props) ---------- */
.valueprops{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; margin-top:28px; border-top:1px solid var(--rule); border-left:1px solid var(--rule); }
.valueprops > div{ padding:20px; border-right:1px solid var(--rule); border-bottom:1px solid var(--rule); }
.valueprops .vp-stat{ font-family:'IBM Plex Mono', monospace; font-size:1.35rem; font-weight:600; color:var(--pine); }
.valueprops .vp-label{ font-size:.86rem; color:var(--muted); margin-top:6px; }
@media (max-width:820px){ .valueprops{grid-template-columns:1fr 1fr;} }
@media (max-width:480px){ .valueprops{grid-template-columns:1fr;} }

/* ---------- iteration proof cards (before -> after, verified) ---------- */
.iter-cards{ display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-top:26px; }
.iter-card{
  border:1px solid var(--rule-strong); border-radius:10px; padding:18px 18px 16px;
  background:var(--paper-raised); box-shadow:var(--shadow);
  display:flex; flex-direction:column; gap:10px;
}
.iter-card .iter-num{ font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--copper); letter-spacing:.06em; text-transform:uppercase; }
.iter-card h4{ font-family:'IBM Plex Sans', sans-serif; font-size:.98rem; font-weight:600; margin:0; }
.iter-card .iter-desc{ font-size:.85rem; color:var(--muted); flex:1; }
.iter-card .iter-move{
  display:flex; align-items:baseline; gap:8px; font-family:'IBM Plex Mono', monospace;
  font-size:1.05rem; font-weight:600; padding-top:10px; border-top:1px dashed var(--rule);
}
.iter-card .iter-move .before{ color:var(--muted); font-weight:400; text-decoration:line-through; font-size:.92rem; }
.iter-card .iter-move .after{ color:var(--pine); }
.iter-card .iter-verified{
  font-family:'IBM Plex Mono', monospace; font-size:10.5px; color:var(--pine);
  display:flex; align-items:center; gap:5px;
}
.iter-card .iter-verified::before{ content:"✓"; }
@media (max-width:820px){ .iter-cards{grid-template-columns:1fr;} }
footer .brand{ font-family:'IBM Plex Mono', monospace; font-weight:600; color:var(--ink); margin-bottom:8px; }