:root{
  --paper:#faf9f7; --panel:#f3f1ec; --ink:#141312; --text:#4b4842; --muted:#8b857c;
  --line:#e4e0d8; --line-2:#efece5; --accent:#9a5238; --accent-d:#7d422c; --accent-soft:#f6ece7;
  --serif:"Instrument Serif",Georgia,"Times New Roman",serif;
  --sans:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --side:248px;
  color-scheme:light;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:2rem}
body{background:var(--paper);color:var(--text);font-family:var(--sans);font-size:.97rem;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
p{max-width:40rem}
p+p{margin-top:.9rem}
strong{color:var(--ink);font-weight:600}
em{font-style:italic}

/* ---------- shell ---------- */
.shell{display:grid;grid-template-columns:var(--side) minmax(0,1fr);min-height:100vh}
aside{border-right:1px solid var(--line);background:var(--paper);position:sticky;top:0;height:100vh;overflow-y:auto;padding:1.75rem 0 3rem}
aside::-webkit-scrollbar{width:6px}
aside::-webkit-scrollbar-thumb{background:#e0dbd2;border-radius:3px}
.mark{display:block;padding:0 1.5rem 1.75rem;font-family:var(--serif);font-size:1.75rem;line-height:1;color:var(--ink);letter-spacing:.01em}
.mark span{display:block;font-family:var(--mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-top:.5rem}
nav.side h4{font-family:var(--mono);font-size:.63rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:500;padding:1.25rem 1.5rem .4rem}
nav.side a{display:block;padding:.32rem 1.5rem;font-size:.885rem;color:var(--text);border-left:2px solid transparent}
nav.side a:hover{color:var(--ink);background:var(--line-2)}
nav.side a[aria-current]{color:var(--ink);font-weight:500;border-left-color:var(--accent);background:var(--line-2)}
nav.side .soon{color:#b3ada3;pointer-events:none}
nav.side .soon::after{content:" ·";}
.side-foot{margin-top:2rem;padding:1.25rem 1.5rem 0;border-top:1px solid var(--line);font-size:.78rem;color:var(--muted)}
.side-foot a{border-bottom:1px solid var(--line)}
.side-foot a:hover{color:var(--ink)}

main{min-width:0}
.inner{max-width:62rem;padding:3.5rem 3.5rem 5rem}

/* mobile bar */
.bar{display:none;position:sticky;top:0;z-index:40;background:rgba(250,249,247,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);padding:.85rem 1.25rem;align-items:center;justify-content:space-between}
.bar .m{font-family:var(--serif);font-size:1.3rem;color:var(--ink)}
.bar button{font:inherit;font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;background:none;border:1px solid var(--line);border-radius:6px;padding:.4rem .7rem;color:var(--ink);cursor:pointer}

/* ---------- page head ---------- */
.phead{border-bottom:1px solid var(--line);padding-bottom:2rem;margin-bottom:2.75rem}
.kicker{font-family:var(--mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:1.1rem}
h1{font-family:var(--serif);font-weight:400;font-size:clamp(2.5rem,5.5vw,4rem);line-height:1.02;letter-spacing:-.01em;color:var(--ink);margin-bottom:1rem;max-width:20ch}
.dek{font-size:1.15rem;line-height:1.55;max-width:36rem;color:var(--text)}
.meta{display:flex;gap:1.5rem;flex-wrap:wrap;margin-top:1.5rem;font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

section{padding:2.75rem 0;border-top:1px solid var(--line-2)}
section:first-of-type{border-top:0;padding-top:0}
h2{font-family:var(--serif);font-weight:400;font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.15;color:var(--ink);margin-bottom:.85rem;max-width:26ch}
h3{font-size:1rem;font-weight:600;color:var(--ink);margin-bottom:.3rem}
h4{font-size:.9rem;font-weight:600;color:var(--ink);margin-bottom:.25rem}
.lede{font-size:1.05rem;max-width:38rem}
.small{font-size:.9rem}
.note{font-size:.85rem;color:var(--muted);margin-top:1.25rem;max-width:40rem}
.eyebrow{font-family:var(--mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:.85rem}

/* ---------- status ---------- */
.st{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.11em;text-transform:uppercase;padding:.24rem .5rem;border-radius:4px;white-space:nowrap;border:1px solid transparent;line-height:1.4}
.st::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor;flex:none}
.st.built{background:#e8efe9;color:#2c5b3d}
.st.current{background:#e8efe9;color:#2c5b3d}
.st.tested{background:#e8efe9;color:#2c5b3d}
.st.dev{background:#f7eedc;color:#87611a}
.st.explored{background:#e9edf2;color:#3f5670}
.st.planned{background:transparent;border-color:var(--line);color:var(--muted)}
.st.proposed{background:transparent;border:1px dashed #d5cfc5;color:var(--muted)}
.st.future{background:var(--panel);color:var(--muted)}
.st.open{background:var(--accent-soft);color:var(--accent-d)}
.st.concept{background:var(--panel);color:var(--text)}

/* ---------- grids ---------- */
.grid{display:grid;gap:1.5rem;margin-top:2rem}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid p{font-size:.92rem}

.card{border:1px solid var(--line);border-radius:10px;padding:1.25rem 1.35rem;background:#fff}
.card .k{font-family:var(--mono);font-size:.64rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-bottom:.55rem}
.card p{font-size:.91rem}
.card .top{display:flex;justify-content:space-between;align-items:flex-start;gap:.75rem;margin-bottom:.5rem}
a.card{display:block;transition:border-color .18s,background .18s}
a.card:hover{border-color:#cfc9be;background:#fffdfa}
a.card h3::after{content:" →";color:var(--accent)}
.panel{background:var(--panel);border-radius:10px;padding:1.25rem 1.35rem}
.panel .k{font-family:var(--mono);font-size:.64rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-bottom:.5rem}
.panel p{color:var(--ink);font-size:.95rem}

.quote{border-left:2px solid var(--accent);padding:.35rem 0 .35rem 1.35rem;margin:1.75rem 0;max-width:38rem}
.quote p{font-family:var(--serif);font-size:1.4rem;line-height:1.3;color:var(--ink)}

/* ---------- lists ---------- */
.rows{list-style:none;border-top:1px solid var(--line);max-width:52rem;margin-top:1.75rem}
.rows>li{display:grid;grid-template-columns:2.75rem 1fr;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.rows .n{font-family:var(--mono);font-size:.7rem;color:var(--muted);padding-top:.2rem}
.rows p{font-size:.92rem}
.defs{list-style:none;max-width:52rem;margin-top:1.75rem}
.defs>li{display:grid;grid-template-columns:12rem 1fr;gap:1.5rem;padding:.95rem 0;border-bottom:1px solid var(--line)}
.defs>li:first-child{border-top:1px solid var(--line)}
.defs .t{color:var(--ink);font-weight:600;font-size:.93rem}
.defs p{font-size:.92rem}
.bullets{list-style:none;max-width:40rem;margin-top:1rem;font-size:.94rem}
.bullets li{padding:.22rem 0 .22rem 1.15rem;position:relative}
.bullets li::before{content:"";position:absolute;left:0;top:.85rem;width:5px;height:1px;background:#c8c2b6}
.qs{list-style:none;max-width:42rem;margin-top:1rem}
.qs li{padding:.6rem 0;border-bottom:1px solid var(--line-2);font-size:.94rem;color:var(--ink)}

/* ---------- table ---------- */
.tw{overflow-x:auto;margin-top:1.75rem;border:1px solid var(--line);border-radius:10px;background:#fff}
table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:34rem}
th{text-align:left;font-family:var(--mono);font-size:.64rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);font-weight:500;padding:.85rem 1.1rem;border-bottom:1px solid var(--line)}
td{padding:.8rem 1.1rem;border-bottom:1px solid var(--line-2);vertical-align:top}
tr:last-child td{border-bottom:0}
td:first-child{color:var(--ink);font-weight:500}

/* ---------- timeline ---------- */
.tl{list-style:none;margin-top:2rem;max-width:52rem}
.tl>li{display:grid;grid-template-columns:8.5rem 1fr;gap:1.75rem;padding:1.5rem 0;border-top:1px solid var(--line)}
.tl .when{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--muted);text-transform:uppercase;padding-top:.2rem}
.tl h3{margin-bottom:.35rem;font-size:1.02rem}
.tl p{font-size:.92rem}
.tl .tags{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.65rem}

/* ---------- lanes ---------- */
.lanes{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem;margin-top:2rem}
.lane{border:1px solid var(--line);border-radius:10px;padding:1.15rem 1.25rem;background:#fff}
.lane>.st{margin-bottom:.9rem}
.lane ul{list-style:none;font-size:.89rem}
.lane li{padding:.3rem 0 .3rem .9rem;position:relative;border-bottom:1px solid var(--line-2)}
.lane li:last-child{border-bottom:0}
.lane li::before{content:"";position:absolute;left:0;top:.85rem;width:4px;height:4px;border-radius:50%;background:#cdc7bb}

/* ---------- flow / diagram ---------- */
.flow{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;margin-top:1.75rem}
.flow .s{font-family:var(--mono);font-size:.75rem;border:1px solid var(--line);border-radius:6px;padding:.45rem .7rem;background:#fff;color:var(--ink)}
.flow .s.hl{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-d)}
.flow .a{color:#c0b9ac}
figure{margin:2rem 0 0}
figure svg{width:100%;height:auto;display:block}
figcaption{font-size:.83rem;color:var(--muted);margin-top:.9rem}
.diagram{border:1px solid var(--line);border-radius:10px;background:#fff;padding:1.75rem 1.5rem;overflow-x:auto}
.diagram svg{min-width:560px}

/* ---------- empty ---------- */
.empty{border:1px dashed #d9d3c9;border-radius:10px;padding:1.25rem 1.35rem;margin-top:1.75rem;max-width:44rem;background:var(--panel)}
.empty .k{color:var(--ink);font-weight:600;font-size:.9rem;margin-bottom:.3rem}
.empty p{font-size:.88rem;color:var(--muted);max-width:none}

/* ---------- related / footer ---------- */
.related{margin-top:3.5rem;padding-top:1.75rem;border-top:1px solid var(--line)}
.related .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:.8rem}
.related a{display:inline-block;font-size:.87rem;border:1px solid var(--line);border-radius:999px;padding:.32rem .8rem;margin:0 .4rem .4rem 0;transition:border-color .18s}
.related a:hover{border-color:var(--accent);color:var(--accent-d)}
.pfoot{margin-top:3.5rem;padding-top:1.5rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.85rem;color:var(--muted)}
.pfoot a:hover{color:var(--ink)}

@media(max-width:900px){
  .shell{grid-template-columns:1fr}
  aside{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:0 0 1.25rem;display:none}
  aside.open{display:block}
  .mark{display:none}
  .bar{display:flex}
  .inner{padding:2rem 1.25rem 3.5rem}
  .g2,.g3,.g4,.lanes{grid-template-columns:1fr}
  .defs>li,.tl>li{grid-template-columns:1fr;gap:.3rem}
  .tl .when{padding-top:0}
  h1{font-size:clamp(2.1rem,9vw,2.8rem)}
}