:root{
  --bg:#f0efe9;
  --line:#cbc9c1;
  --ink:#161614;
  --mute:#6c6b64;
  --tag:#8a8880;
  --sim-line:#3b3a35;
  --sim-dim:#b4b2aa;
  --sim-hot:#111110;
  --sim-bad:#a8442f;
  --sim-good:#3f6b52;

  --dark:#171a10;
  --dark-line:#2f3326;
  --dark-ink:#e9e7dd;
  --dark-mute:#9a9c8c;
  --lime:#d8f24b;
}
[data-theme="dark"]{
  --bg:#111110;
  --line:#2c2c28;
  --ink:#eceae3;
  --mute:#918f87;
  --tag:#6e6c65;
  --sim-line:#c9c6bc;
  --sim-dim:#44443d;
  --sim-hot:#f6f3ea;
  --sim-bad:#e0705a;
  --sim-good:#7fc9a1;
}

*{box-sizing:border-box}
html,body{margin:0}
body{
  background:var(--bg);color:var(--ink);
  font:400 16px/1.6 "DM Sans",ui-sans-serif,system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
  transition:background .35s ease,color .35s ease;
}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace}

/* ============ section 1 : cards ============ */
.sec-work{padding:64px 40px 96px;max-width:1720px;margin:0 auto}
.topbar{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:40px}
.eyebrow{
  font:400 11px/1 "JetBrains Mono",ui-monospace,monospace;
  letter-spacing:.16em;text-transform:uppercase;color:var(--tag);
}
.toggle{
  font:400 11px/1 "JetBrains Mono",ui-monospace,monospace;
  letter-spacing:.12em;text-transform:uppercase;color:var(--mute);
  background:transparent;border:1px solid var(--line);border-radius:2px;
  padding:9px 14px;cursor:pointer;transition:color .2s,border-color .2s;
}
.toggle:hover{color:var(--ink);border-color:var(--ink)}

.split{display:grid;grid-template-columns:minmax(280px,1fr) 2.05fr;gap:64px;align-items:start}
.lede{
  font:400 clamp(38px,3.7vw,62px)/1.06 "DM Serif Display",Georgia,serif;
  letter-spacing:-.012em;margin:0;color:var(--ink);
}

.grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}
.card{
  position:relative;display:flex;flex-direction:column;
  border-right:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:26px 30px 30px;min-height:496px;
}
.card:nth-child(2n){border-right:0}
.card:nth-child(n+3){border-bottom:0}

/* fixed height + nowrap on purpose: this block sits above a flex:1 stage, so if
   a changing readout can reflow it, the canvas resizes and the sim resets every
   frame. Keep it dimensionally inert. */
.cardhead{
  display:flex;justify-content:space-between;align-items:flex-start;gap:16px;
  position:relative;z-index:2;height:34px;
}
.num{font:400 12px/1 "JetBrains Mono",ui-monospace,monospace;color:var(--tag);letter-spacing:.08em}
.simmeta{
  text-align:right;font:400 10.5px/1.55 "JetBrains Mono",ui-monospace,monospace;
  letter-spacing:.09em;text-transform:uppercase;
  white-space:nowrap;overflow:hidden;
}
.simname{color:var(--mute);display:block}
.readout{color:var(--tag);display:block}

.stage{position:relative;flex:1;margin:10px -30px 0;min-height:236px}
.stage canvas{display:block;width:100%;height:100%;position:absolute;inset:0}

.meta{position:relative;z-index:2;margin-top:20px}
h2{font:400 34px/1.14 "DM Serif Display",Georgia,serif;margin:0 0 12px;color:var(--ink)}
.desc{margin:0 0 20px;color:var(--mute);font-size:15.5px;max-width:42ch}
.tags{font:400 11px/1 "JetBrains Mono",ui-monospace,monospace;letter-spacing:.13em;text-transform:uppercase;color:var(--tag)}
.tags span{opacity:.5;padding:0 6px}
.legend{
  margin-top:14px;padding-top:12px;border-top:1px solid var(--line);
  font:400 11.5px/1.5 "JetBrains Mono",ui-monospace,monospace;
  color:var(--tag);letter-spacing:.02em;
}
.legend b{color:var(--mute);font-weight:400}

/* ============ shared dark sections ============ */
.dark-sec{background:var(--dark);color:var(--dark-ink);padding:96px 40px}
.dark-inner{max-width:1720px;margin:0 auto}

/* ---- operating principles terminal ---- */
.term-wrap{position:relative;max-width:840px;margin:0 auto}
.term-shadow{position:absolute;inset:44px -40px -28px 40px;background:var(--lime);z-index:0}
.term{
  position:relative;z-index:1;background:#101208;
  border:1px solid var(--dark-line);
  font-family:"JetBrains Mono",ui-monospace,monospace;
}
.term-bar{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 22px;border-bottom:1px solid var(--dark-line);
}
.dots{display:flex;gap:9px}
.dots i{width:10px;height:10px;border-radius:50%;border:1px solid #4a4f3a;display:block;transition:background .25s,border-color .25s}
.term:hover .dots i:nth-child(1){background:#4a4f3a}
.term-file{font-size:13px;color:var(--dark-mute)}

.prow{
  display:flex;align-items:flex-start;gap:22px;
  padding:20px 22px;border-bottom:1px solid var(--dark-line);
  cursor:pointer;background:transparent;border-left:2px solid transparent;
  transition:background .18s ease,border-left-color .18s ease;
  width:100%;text-align:left;color:inherit;font:inherit;
}
.prow:hover,.prow[aria-expanded="true"]{background:#161a0d;border-left-color:var(--lime)}
.pnum{color:var(--lime);font-size:14px;font-weight:700;flex:none;width:22px}
.pbody{flex:1}
.ptitle{font-size:15px;color:var(--dark-ink);letter-spacing:.01em}
.pdetail{
  max-height:0;overflow:hidden;opacity:0;
  transition:max-height .32s ease,opacity .26s ease,margin .32s ease;
  font-size:13px;line-height:1.7;color:var(--dark-mute);margin:0;
}
.prow[aria-expanded="true"] .pdetail{max-height:90px;opacity:1;margin:10px 0 0}
.pcaret{color:#4a4f3a;font-size:13px;flex:none;transition:color .2s,transform .25s}
.prow:hover .pcaret{color:var(--lime)}
.prow[aria-expanded="true"] .pcaret{transform:rotate(90deg);color:var(--lime)}

.term-foot{display:flex;align-items:center;gap:12px;padding:26px 22px;min-height:92px}
.led{width:11px;height:11px;background:var(--lime);flex:none;box-shadow:0 0 10px 2px rgba(216,242,75,.45);animation:blip 2.6s ease-in-out infinite}
@keyframes blip{0%,100%{opacity:1}50%{opacity:.45}}
.term-status{font-size:13.5px;color:var(--dark-mute)}
.caret{display:inline-block;width:8px;height:15px;background:var(--lime);vertical-align:-2px;margin-left:3px;animation:blink 1.1s steps(1) infinite}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:0}}

/* ---- process stepper ---- */
.proc-split{display:grid;grid-template-columns:minmax(240px,.85fr) 2.4fr;gap:56px;align-items:start}
.proc-lede{font:400 clamp(34px,3.2vw,54px)/1.08 "DM Serif Display",Georgia,serif;margin:0;color:var(--dark-ink)}
.proc{border-top:1px solid var(--dark-line)}
.step{
  display:grid;grid-template-columns:150px 1fr;gap:30px;align-items:start;
  padding:30px 0 30px 16px;border-bottom:1px solid var(--dark-line);
  cursor:pointer;position:relative;border-left:2px solid transparent;
  transition:border-left-color .2s ease,padding-left .2s ease;
  width:100%;text-align:left;color:inherit;font:inherit;background:transparent;
}
.step:hover,.step.on{border-left-color:var(--lime);padding-left:24px}
.proc.touched .step:not(:hover):not(.on){opacity:.42}
.step{transition:border-left-color .2s,padding-left .2s,opacity .25s}
.skey{
  font:400 12px/1 "JetBrains Mono",ui-monospace,monospace;
  letter-spacing:.14em;text-transform:uppercase;color:var(--lime);
  display:flex;align-items:center;gap:10px;padding-top:5px;
}
.sbar{flex:1;height:1px;background:var(--dark-line);position:relative;max-width:56px}
.sbar i{position:absolute;inset:0 100% 0 0;background:var(--lime);transition:right .45s ease}
.step:hover .sbar i,.step.on .sbar i{right:0}
.stext{font-size:17px;line-height:1.55;color:#c9cbbc;max-width:62ch}
.sartifacts{
  max-height:0;overflow:hidden;opacity:0;margin:0;
  transition:max-height .34s ease,opacity .28s ease,margin .34s ease;
  font:400 11.5px/1.9 "JetBrains Mono",ui-monospace,monospace;
  letter-spacing:.06em;text-transform:uppercase;color:var(--dark-mute);
}
.step:hover .sartifacts,.step.on .sartifacts{max-height:80px;opacity:1;margin:14px 0 0}
.sartifacts em{color:var(--lime);font-style:normal;padding-right:9px}

.foot{
  margin-top:34px;color:var(--tag);
  font:400 12px/1.7 "JetBrains Mono",ui-monospace,monospace;max-width:82ch;
}

@media (max-width:1100px){
  .split,.proc-split{grid-template-columns:1fr;gap:36px}
  .grid{grid-template-columns:1fr}
  .card{border-right:0}
  .card:nth-child(n+3){border-bottom:1px solid var(--line)}
  .card:last-child{border-bottom:0}
  .step{grid-template-columns:1fr;gap:10px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important}
  .toggle,.card,body,.pdetail,.sartifacts{transition:none}
}