/* ============================================================
   fabius — landing
   Apple structural target · one accent · white canvas
   ============================================================ */
@font-face{
  font-family:"Inter var";
  src:url("/assets/inter.woff2") format("woff2");
  font-weight:100 900; font-display:swap; font-style:normal;
}

:root{
  /* color */
  --canvas:#ffffff;
  --canvas-alt:#f6f5fb;        /* faint violet off-white — the section divider */
  --canvas-ink:#0c0b12;        /* dark band */
  --ink:#17161c;               /* near-black text, not pure black */
  --ink-2:#3b3a45;
  --muted:#6c6b78;
  --faint:#6f6e7a;
  --hairline:#ececf3;
  --hairline-2:#e3e2ee;
  --primary:#7a3dff;           /* the one interactive accent */
  --primary-strong:#6322e8;    /* hover / focus */
  --primary-ink:#5b27d6;       /* accent text on white (AA) */
  --primary-lite:#9b6bff;      /* lighter accent — gradients only */
  --lav:#c9b6ff;
  --chart-base:#e2dfee;        /* neutral bar/track tone */
  --tint:#f3eeff;              /* accent wash */
  --tint-2:#ece3ff;
  --on-primary:#ffffff;
  /* data-viz secondary palette — cool + warm, used only in charts (AA-checked) */
  --c-teal:#14a596;            /* cool secondary — control arm + family-lift bars (graphical 3.0+) */
  --c-teal-ink:#0a6f65;        /* teal text/labels (AA) */
  --c-teal-wash:#e2f4f1;       /* faint teal — halos / icon backgrounds */
  --c-amber:#cf7a1a;           /* warm accent — gain arrows + the knee/threshold (graphical 3.0+) */
  --c-amber-ink:#9a5a10;       /* amber text/labels (AA) */
  --c-amber-wash:#f8edda;      /* faint amber — halos / icon backgrounds */

  /* type */
  --sans:"Inter var","Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono","Menlo","Consolas",monospace;

  /* space */
  --wrap:1120px;
  --gut:24px;
  --sec:clamp(80px,11vw,136px);

  /* radius */
  --r-s:12px; --r-m:18px; --r-l:26px; --r-pill:999px;

  /* shadow — the single elevation, reserved for imagery/cards */
  --shadow:0 1px 2px rgba(20,16,40,.04), 0 18px 50px -22px rgba(58,36,120,.30);
  --shadow-sm:0 1px 2px rgba(20,16,40,.05), 0 8px 24px -16px rgba(58,36,120,.28);

  --ease:cubic-bezier(.4,0,.2,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0; background:var(--canvas); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.55;
  font-weight:400; letter-spacing:-0.011em;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3{margin:0;font-weight:600;letter-spacing:-0.03em;line-height:1.05;color:var(--ink)}
p{margin:0}
a{color:inherit;text-decoration:none}
em{font-style:normal;color:var(--ink);font-weight:600}
code{font-family:var(--mono);font-size:.92em}
img{display:block;max-width:100%}
::selection{background:var(--tint-2);color:var(--primary-ink)}
:focus-visible{outline:2.5px solid var(--primary);outline-offset:3px;border-radius:6px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px;z-index:100}
.skip:focus{left:12px;top:12px}

/* ── buttons ─────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font:inherit;font-weight:540;font-size:15px;letter-spacing:-0.01em;
  padding:11px 20px;border-radius:var(--r-pill);cursor:pointer;
  border:1px solid transparent;white-space:nowrap;
  transition:transform .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease), color .22s var(--ease);
}
.btn.primary{background:var(--primary);color:var(--on-primary);box-shadow:0 1px 2px rgba(30,16,70,.16)}
.btn.primary:hover{background:var(--primary-strong);transform:translateY(-1px);box-shadow:0 6px 16px -6px rgba(122,61,255,.55)}
.btn.ghost{background:#fff;color:var(--ink);border-color:var(--hairline-2)}
.btn.ghost:hover{border-color:var(--lav);background:var(--tint);color:var(--primary-ink);transform:translateY(-1px)}
.btn:active{transform:translateY(0) scale(.975)}
.btn.lg{font-size:16px;padding:14px 26px}

.text-link{color:var(--primary-ink);font-weight:540;font-size:15px;display:inline-block;transition:color .15s var(--ease)}
.text-link:hover{color:var(--primary-strong)}

/* ── nav ─────────────────────────────────────────────────── */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
  border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(255,255,255,.78);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);border-bottom-color:var(--hairline)}
.nav-in{height:66px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:9px;font-weight:600;letter-spacing:-0.03em;font-size:18px}
.brand-mark{width:24px;height:24px;color:var(--primary);flex:none}
.brand-name{color:var(--ink)}
.nav-links{display:flex;gap:4px;margin-inline:auto}
.nav-links a{color:var(--ink-2);font-size:14.5px;font-weight:480;padding:10px 12px;border-radius:9px;transition:color .15s,background .15s}
.nav-links a:hover{color:var(--ink);background:var(--canvas-alt)}
.nav-links a[aria-current]{color:var(--primary-ink);font-weight:600;background:var(--tint)}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-cta .btn{padding:9px 17px;font-size:14px}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--hairline-2);border-radius:11px;background:#fff;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{width:18px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s var(--ease),opacity .2s}
.nav-toggle[aria-expanded=true] span:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded=true] span:last-child{transform:translateY(-3.5px) rotate(-45deg)}
.mobile-menu{display:none;flex-direction:column;gap:4px;padding:14px var(--gut) 22px}
.mobile-menu a{padding:13px 12px;border-radius:11px;font-size:16px;color:var(--ink);font-weight:480}
.mobile-menu a:hover{background:var(--canvas-alt)}
.mobile-menu .btn{margin-top:6px;width:100%}

/* ── hero ────────────────────────────────────────────────── */
.hero{position:relative;padding:148px 0 92px;text-align:center;overflow:hidden;isolation:isolate}
.hero-in{position:relative;z-index:2;max-width:880px}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:13.5px;font-weight:500;color:var(--ink-2);
  background:#fff;border:1px solid var(--hairline-2);border-radius:var(--r-pill);padding:7px 8px 7px 14px;
  box-shadow:var(--shadow-sm);margin-bottom:30px;transition:border-color .2s,transform .2s var(--ease)}
.eyebrow:hover{border-color:var(--lav);transform:translateY(-1px)}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 4px var(--tint)}
.eyebrow .arrow{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--tint);color:var(--primary-ink);font-size:13px}
.hero-title{font-size:clamp(36px,10.4vw,108px);letter-spacing:-0.045em;line-height:.96;margin-bottom:26px}
.hero-title .line{display:block}
.hero-title .accent{color:var(--primary);background:linear-gradient(95deg,var(--primary),var(--primary-lite) 60%,var(--primary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:clamp(17px,2.1vw,21px);line-height:1.5;color:var(--muted);max-width:640px;margin:0 auto 36px;font-weight:420}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
.hero-cmd{display:inline-flex;align-items:center;gap:14px;background:var(--canvas-ink);color:#eceaf6;border-radius:14px;
  padding:7px 7px 7px 18px;font-family:var(--mono);font-size:14.5px;box-shadow:var(--shadow)}
.hero-cmd code{color:#f3f1fb}
.hero-cmd .muted{color:#8b86a8;margin-right:4px}
.copy{font-family:var(--sans);font-size:13px;font-weight:540;color:#fff;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.16);border-radius:9px;padding:13px 16px;cursor:pointer;transition:background .15s,transform .15s var(--ease)}
.copy:hover{background:rgba(255,255,255,.2)}
.copy:active{transform:scale(.95)}
.copy.done{background:var(--primary);border-color:var(--primary)}
.hero-fade{position:absolute;inset:auto 0 0 0;height:160px;background:linear-gradient(to top,#fff,transparent);z-index:1;pointer-events:none}

/* hero swarm — living walkers */
.swarm{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden}

/* ── walking beetles (built by main.js into .swarm / .core-walk) ── */
.walker{position:absolute;top:var(--lane,40%);left:0;width:var(--size,60px);color:var(--lav);opacity:var(--op,.4);
  --seam:var(--canvas);animation:cross var(--dur,28s) linear var(--delay,0s) infinite}
.walker.rtl{animation-direction:reverse}
.walker-bob{animation:bob var(--bd,2s) ease-in-out infinite;transform-origin:center}
.wb{width:100%;height:auto;display:block;rotate:90deg}
.walker.rtl .wb{rotate:-90deg}
/* each leg hinges at its own hip (--ox/--oy) so the foot swings but the body join never detaches;
   tripod gait = la / lb swing in opposite phase, smoothly coordinated */
.wb .leg{transform-box:view-box;transform-origin:var(--ox,60px) var(--oy,92px)}
.wb .la{animation:stepA var(--ld,.6s) ease-in-out infinite}
.wb .lb{animation:stepB var(--ld,.6s) ease-in-out infinite}
.walker.no-legs .leg{animation:none}
@keyframes cross{from{transform:translateX(-16vw)}to{transform:translateX(116vw)}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-3.5px)}}
@keyframes stepA{0%,100%{transform:rotate(-8deg)}50%{transform:rotate(8deg)}}
@keyframes stepB{0%,100%{transform:rotate(8deg)}50%{transform:rotate(-8deg)}}
@media (prefers-reduced-motion:reduce){.walker{animation:none;opacity:calc(var(--op,.4) * .8)}.walker-bob,.wb .leg{animation:none}}

/* ── trust strip ─────────────────────────────────────────── */
.strip{border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);background:var(--canvas-alt)}
.strip-in{display:flex;align-items:center;justify-content:center;gap:18px;flex-wrap:wrap;
  padding:18px var(--gut);font-size:13.5px;color:var(--muted);font-weight:480}
.strip-in i{width:4px;height:4px;border-radius:50%;background:var(--lav);flex:none}

/* ── section heads ───────────────────────────────────────── */
.sec-head{max-width:680px;margin:0 0 56px}
.eyebrow-text{font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--primary-ink);margin-bottom:16px}
.eyebrow-text .eb-n{font-family:var(--mono);color:var(--lav);margin-right:9px;font-weight:700;letter-spacing:0}
.sec-title{font-size:clamp(30px,4.4vw,46px);letter-spacing:-0.035em;margin-bottom:18px}
.sec-lede{font-size:clamp(16px,1.9vw,19px);color:var(--muted);line-height:1.55;font-weight:420}
.sec-lede code,.idea-body code,.install-sub code,.install-note code{font-family:var(--mono);font-size:.86em;background:var(--tint);color:var(--primary-ink);padding:2px 6px;border-radius:6px}

/* ── the explainer (video) ───────────────────────────────── */
.demo{padding:var(--sec) 0;background:var(--canvas);position:relative}
.demo-head{max-width:720px;margin-inline:auto;margin-bottom:44px;text-align:center}
.demo-emblem{width:56px;height:56px;color:var(--primary);display:block;margin:0 auto 24px}
.demo-frame{position:relative;max-width:980px;margin-inline:auto;aspect-ratio:16/9;border-radius:var(--r-l);overflow:hidden;background:var(--canvas-ink);border:1px solid var(--hairline);box-shadow:var(--shadow);isolation:isolate}
.demo-frame.playing::before{content:"";position:absolute;inset:-3px;z-index:-1;background:radial-gradient(58% 58% at 50% 38%,rgba(123,61,255,.30),transparent 70%);filter:blur(40px)}
.demo-video{width:100%;height:100%;object-fit:cover;display:block;cursor:pointer}
.demo-toggle{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:84px;height:84px;border-radius:50%;border:1px solid rgba(255,255,255,.30);background:rgba(18,14,28,.46);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:#fff;display:grid;place-items:center;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .3s var(--ease),background .2s var(--ease)}
.demo-frame.show-controls .demo-toggle{opacity:1;pointer-events:auto}
.demo-toggle:hover{background:rgba(123,61,255,.52)}
.demo-toggle:active{transform:translate(-50%,-50%) scale(.95)}
.demo-toggle:focus-visible{outline:2px solid #fff;outline-offset:4px}
.demo-toggle svg{width:34px;height:34px;fill:currentColor}
.demo-toggle .ic-play{margin-left:3px}
.demo-toggle .ic-pause{display:none}
.demo-frame.playing .demo-toggle .ic-play{display:none}
.demo-frame.playing .demo-toggle .ic-pause{display:block;margin-left:0}
@media (max-width:560px){.demo-toggle{width:64px;height:64px}.demo-toggle svg{width:26px;height:26px}}

/* ── the one idea ────────────────────────────────────────── */
.idea{padding:var(--sec) 0;text-align:center;background:
  radial-gradient(120% 80% at 50% -10%, var(--tint) 0%, transparent 55%), var(--canvas)}
.idea-in{max-width:760px;margin-inline:auto}
.idea-title{font-size:clamp(28px,4.6vw,50px);letter-spacing:-0.035em;line-height:1.08;margin-bottom:26px}
.idea-title .u{text-decoration:underline;text-decoration-color:var(--lav);text-decoration-thickness:3px;text-underline-offset:5px}
.idea-title .accent{color:var(--primary)}
.idea-body{font-size:clamp(17px,2vw,20px);color:var(--muted);line-height:1.6;margin-bottom:28px;font-weight:420}
.idea-foot{font-size:15px;color:var(--faint);max-width:560px;margin-inline:auto;font-style:italic}

/* ── what changes ────────────────────────────────────────── */
.changes{padding:var(--sec) 0;background:var(--canvas-alt);border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline)}
.cmp{display:flex;flex-direction:column;gap:0;border:1px solid var(--hairline-2);border-radius:var(--r-l);overflow:hidden;background:#fff;box-shadow:var(--shadow-sm)}
.cmp-row{display:grid;grid-template-columns:.8fr 1.3fr 1.5fr;gap:24px;padding:20px 28px;align-items:center;border-top:1px solid var(--hairline)}
.cmp-row:first-child{border-top:0}
.cmp-h{background:var(--canvas);font-size:13px;font-weight:600;letter-spacing:.02em;text-transform:uppercase;color:var(--faint);padding-block:16px}
.cmp-h .cmp-f{color:var(--primary-ink)}
.cmp-k{font-weight:560;color:var(--ink);letter-spacing:-0.02em}
.cmp-row span{font-size:15.5px;color:var(--muted);line-height:1.45}
.cmp-row .cmp-f{color:var(--ink);font-weight:480;position:relative;padding-left:26px}
.cmp-row:not(.cmp-h) .cmp-f::before{content:"";position:absolute;left:0;top:7px;width:16px;height:16px;border-radius:50%;
  background:var(--c-teal-wash) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a6f65' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/11px no-repeat}

/* ── architecture ────────────────────────────────────────── */
.arch{padding:var(--sec) 0}
.flow{display:flex;flex-direction:column;align-items:center;gap:0;max-width:760px;margin-inline:auto}
.flow-node{border-radius:var(--r-m);padding:14px 26px;font-weight:540;letter-spacing:-0.02em;text-align:center}
.flow-node.prompt{background:var(--canvas-alt);border:1px solid var(--hairline-2);color:var(--ink-2);font-family:var(--mono);font-size:14px}
.flow-node.router{display:flex;align-items:center;gap:16px;background:var(--canvas-ink);color:#fff;padding:18px 30px;box-shadow:var(--shadow);text-align:left}
.flow-node.router .fn-mark{width:34px;height:34px;color:var(--lav);flex:none}
.flow-node.router b{font-size:18px;font-weight:600}
.flow-node.router small{display:block;color:#a7a2c4;font-size:12.5px;font-weight:430;font-family:var(--mono);margin-top:3px;letter-spacing:0}
.flow-node.result{background:var(--primary);color:#fff;box-shadow:0 14px 34px -14px rgba(122,61,255,.8);font-size:16px}
.flow-conn{height:36px;width:2px;background:linear-gradient(var(--hairline-2),var(--lav));position:relative}
.flow-conn span{position:absolute;bottom:-1px;left:50%;transform:translateX(-50%);width:7px;height:7px;border-right:2px solid var(--lav);border-bottom:2px solid var(--lav);rotate:45deg}
.flow-spec{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;max-width:560px;margin-bottom:14px}
.chip{font-family:var(--mono);font-size:13px;color:var(--ink-2);background:#fff;border:1px solid var(--hairline-2);
  border-radius:var(--r-pill);padding:8px 15px;transition:border-color .15s,color .15s,transform .15s var(--ease)}
.chip:hover{border-color:var(--lav);color:var(--primary-ink);transform:translateY(-2px)}
.flow-core{font-size:14px;color:var(--muted);background:var(--tint);border:1px dashed var(--lav);border-radius:var(--r-pill);padding:11px 22px;text-align:center}
.flow-core b{color:var(--primary-ink);font-family:var(--mono);font-weight:600;font-size:13.5px}
/* dispatch — ONE precise choreographed cycle (4s, gated by .flow.in):
   prompt sends → signal travels → router activates → splits & fans out to the specialists
   → through the lean core → converges to the result. Each step is timed in sequence. */
.flow-node.prompt::after{content:"";display:inline-block;width:7px;height:1em;margin-left:7px;vertical-align:-2px;background:var(--lav);border-radius:1px}
@media (prefers-reduced-motion:no-preference){
  .flow-node.prompt::after{animation:blink 1.15s step-end infinite}
  /* a glowing signal dot travels each connector at its moment in the sequence */
  .flow.in .flow-conn::after{content:"";position:absolute;left:50%;top:0;width:8px;height:8px;margin-left:-4px;border-radius:50%;
    background:var(--primary);box-shadow:0 0 11px 2px rgba(122,61,255,.75);opacity:0;animation:travel 4s var(--ease) infinite}
  .flow.in .flow-conn:nth-child(2)::after{animation-delay:.4s}
  .flow.in .flow-conn:nth-child(4)::after{animation-delay:1.05s}
  .flow.in .flow-conn:nth-child(7)::after{animation-delay:2.5s}
  /* nodes activate in order */
  .flow.in .flow-node.prompt{animation:promptAct 4s var(--ease) infinite}
  .flow.in .flow-node.router{animation:routerAct 4s var(--ease) infinite;animation-delay:.6s}
  .flow.in .flow-core{animation:coreAct 4s var(--ease) infinite;animation-delay:2.15s}
  .flow.in .flow-node.result{animation:resGlow 4s var(--ease) infinite;animation-delay:2.85s}
  /* THE SPLIT — chips fan out in a fast staggered wave */
  .flow.in .chip{animation:chipWave 4s var(--ease) infinite}
  .flow.in .chip:nth-child(1){animation-delay:1.40s}
  .flow.in .chip:nth-child(2){animation-delay:1.50s}
  .flow.in .chip:nth-child(3){animation-delay:1.60s}
  .flow.in .chip:nth-child(4){animation-delay:1.70s}
  .flow.in .chip:nth-child(5){animation-delay:1.80s}
  .flow.in .chip:nth-child(6){animation-delay:1.90s}
  .flow.in .chip:nth-child(7){animation-delay:2.00s}
}
@keyframes travel{0%{top:-3px;opacity:0}10%{opacity:1}14%{top:33px;opacity:1}18%,100%{top:33px;opacity:0}}
@keyframes promptAct{
  0%,100%{border-color:var(--hairline-2);background:var(--canvas-alt);color:var(--ink-2)}
  3%{border-color:var(--lav);background:var(--tint);color:var(--primary-ink)}
  12%{border-color:var(--hairline-2);background:var(--canvas-alt);color:var(--ink-2)}
}
@keyframes routerAct{
  0%,100%{box-shadow:var(--shadow)}
  4%{box-shadow:0 0 0 4px var(--tint),0 18px 40px -12px rgba(122,61,255,.55)}
  14%{box-shadow:var(--shadow)}
}
@keyframes chipWave{
  0%,100%{border-color:var(--hairline-2);color:var(--ink-2);transform:translateY(0);box-shadow:none}
  4%{border-color:var(--lav);color:var(--primary-ink);transform:translateY(-3px);box-shadow:0 8px 18px -10px rgba(122,61,255,.55)}
  16%{border-color:var(--hairline-2);color:var(--ink-2);transform:translateY(0);box-shadow:none}
}
@keyframes coreAct{
  0%,100%{border-color:var(--lav);box-shadow:none}
  5%{border-color:var(--primary);box-shadow:0 6px 18px -8px rgba(122,61,255,.5)}
  16%{border-color:var(--lav);box-shadow:none}
}
@keyframes resGlow{
  0%,100%{box-shadow:0 14px 34px -14px rgba(122,61,255,.75);transform:translateY(0)}
  5%{box-shadow:0 0 0 6px var(--tint),0 20px 46px -10px rgba(122,61,255,.95);transform:translateY(-2px)}
  20%{box-shadow:0 14px 34px -14px rgba(122,61,255,.75);transform:translateY(0)}
}

/* ── nine skills grid ────────────────────────────────────── */
.skills{padding:var(--sec) 0;background:var(--canvas-alt);border-top:1px solid var(--hairline)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:#fff;border:1px solid var(--hairline-2);border-radius:var(--r-l);padding:26px 24px;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--lav);border-color:color-mix(in srgb, var(--acc,#7a3dff) 42%, var(--hairline-2))}
.card.lead{background:linear-gradient(160deg,#fff,var(--tint));border-color:var(--lav)}
.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.card-ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;flex:none;
  background:var(--tint);background:color-mix(in srgb, var(--acc,#7a3dff) 13%, #fff);
  color:var(--acc,#7a3dff);transition:transform .35s var(--ease)}
.card-ic svg{width:32px;height:34px;display:block}
.card:hover .card-ic{transform:scale(1.07)}
.card-tag{font-size:11.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--faint)}
.card h3{font-size:18px;font-family:var(--mono);font-weight:600;letter-spacing:-0.02em;margin-bottom:9px;color:var(--ink)}
.card p{font-size:14.5px;color:var(--muted);line-height:1.5}
.latin{margin-top:34px;text-align:center;font-size:13.5px;color:var(--faint);font-style:italic;line-height:1.7}

/* ── charts (tokenized, data-ink) ────────────────────────── */
.chart{width:100%;height:auto;display:block}
.chart text{font-family:var(--mono)}
.c-grid{stroke:var(--hairline);stroke-width:1}
.c-axis{fill:var(--faint);font-size:11px}
.c-xlab{fill:var(--muted);font-size:12.5px}
.c-base{fill:var(--chart-base)}.c-ctl{fill:var(--c-teal)}.c-fab{fill:var(--primary)}
.c-val{fill:var(--ink);font-size:14.5px;font-weight:700;letter-spacing:-0.01em;font-family:var(--sans)}
.c-val-sm{fill:var(--faint);font-size:11.5px;font-weight:540;font-family:var(--sans)}
.c-region{fill:var(--faint);font-size:11px;font-style:italic;letter-spacing:.02em}
.c-range{stroke:var(--lav);stroke-width:1.5}
.c-range-lab{fill:var(--primary-ink);font-size:11px;font-weight:600;font-family:var(--sans)}
.c-knee-halo{fill:var(--c-amber);opacity:.18}
.bench-chart rect.c-base,.bench-chart rect.c-ctl,.bench-chart rect.c-fab{transform-box:fill-box;transform-origin:50% 100%;transform:scaleY(0);transition:transform .9s var(--ease)}
.bench-figure.in .bench-chart rect{transform:scaleY(1)}
.c-shade{fill:var(--tint);opacity:.6}
.c-area{fill:var(--tint);opacity:.7}
.c-line{fill:none;stroke:var(--primary);stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:820;stroke-dashoffset:820;transition:stroke-dashoffset 1.5s var(--ease)}
.ladder-fig.in .c-line{stroke-dashoffset:0}
.c-knee{stroke:var(--c-amber);stroke-width:1.5;stroke-dasharray:4 5;opacity:.6}
.c-knee-dot{fill:#fff;stroke:var(--c-amber);stroke-width:3}
.c-knee-lab{fill:var(--c-amber-ink);font-size:12px;font-weight:600;font-family:var(--sans)}
.c-pt-fab{fill:var(--primary)}.c-pt{fill:var(--faint)}
.c-axtitle{fill:var(--faint);font-size:11px;text-transform:uppercase;letter-spacing:.08em}
/* benchmark gain arrows */
.c-gain{stroke:var(--c-amber);stroke-width:1.6}
.c-gain-h{fill:none;stroke:var(--c-amber);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.c-gain-l{fill:var(--c-amber-ink);font-size:11px;font-weight:700;font-family:var(--sans)}
/* cross-family bars */
.c-famtrack{fill:var(--canvas-alt)}
.c-fam{fill:var(--c-teal);transform-box:fill-box;transform-origin:0 50%;transform:scaleX(0);transition:transform .9s var(--ease)}
.fam-figure.in .c-fam{transform:scaleX(1)}
.c-famlab{fill:var(--ink);font-size:13px;font-weight:600;font-family:var(--mono)}
.c-famval{fill:var(--c-teal-ink);font-size:12.5px;font-weight:700;font-family:var(--sans)}
/* value-gate */
.c-engage{fill:var(--c-teal);opacity:.1}
.c-zero{stroke:var(--hairline-2);stroke-width:1.5}
.c-region2{fill:var(--c-teal-ink);font-size:12px;font-weight:600;font-family:var(--sans);letter-spacing:.03em}
.gate-chart .c-line{stroke-dasharray:none;stroke-dashoffset:0}
.fig-title{font-size:clamp(17px,2.1vw,21px);font-weight:600;letter-spacing:-0.02em;color:var(--ink);margin-bottom:22px;line-height:1.3}
.fig-note{font-size:12.5px;color:var(--faint);font-style:italic;margin-top:14px;max-width:460px}
.bench-figure,.ladder-fig{margin:0;background:#fff;border:1px solid var(--hairline-2);border-radius:var(--r-l);padding:clamp(22px,3vw,34px);box-shadow:var(--shadow-sm)}
.chart-legend{display:flex;gap:20px;justify-content:flex-start;flex-wrap:wrap;margin-top:16px;font-size:13px;color:var(--muted);font-family:var(--sans)}
.chart-legend span{display:inline-flex;align-items:center;gap:7px}
.chart-legend span::before{content:"";width:11px;height:11px;border-radius:3px}
.lg-base::before{background:var(--chart-base)}.lg-ctl::before{background:var(--c-teal)}.lg-fab::before{background:var(--primary)}
.chart-legend small{color:var(--c-teal-ink);font-size:11.5px;font-weight:600;margin-left:5px}

/* ── core band (dark signature) ──────────────────────────── */
.core{position:relative;background:var(--canvas-ink);color:#fff;padding:clamp(96px,13vw,156px) 0;overflow:hidden;isolation:isolate;text-align:center}
.core-grid{position:absolute;inset:0;z-index:0;
  background-image:linear-gradient(rgba(155,107,255,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(155,107,255,.10) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:radial-gradient(125% 85% at 50% 50%,#000 28%,transparent 76%);
  mask-image:radial-gradient(125% 85% at 50% 50%,#000 28%,transparent 76%)}
.core-walk{position:absolute;inset:0;z-index:1;pointer-events:none}
.core-in{position:relative;z-index:2}
.core-kicker{font-family:var(--mono);font-size:11.5px;letter-spacing:.34em;color:#9b8fd6;margin-bottom:34px}
.core-wordmark{display:block;width:min(540px,74vw);height:auto;margin:0 auto 30px;color:#fff;
  filter:drop-shadow(0 0 24px rgba(122,61,255,.55))}
.core-tag{font-size:clamp(14px,1.9vw,17px);letter-spacing:.06em;color:var(--lav);margin-bottom:20px;font-weight:500;text-transform:lowercase}
.core-sub{max-width:540px;margin:0 auto;color:#b6b0d6;font-size:clamp(15px,1.8vw,17px);line-height:1.62;font-weight:420}

/* ── benchmark ───────────────────────────────────────────── */
.bench{padding:var(--sec) 0}
.bench-line{max-width:780px;font-size:clamp(16px,1.9vw,19px);color:var(--ink-2);line-height:1.6;margin-bottom:22px;font-weight:420}
.bench-line strong{color:var(--ink);font-weight:580}

/* ── research ────────────────────────────────────────────── */
.research{padding:var(--sec) 0;background:var(--canvas-alt);border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline)}
.research-in{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}
.research-pts{list-style:none;padding:0;margin:26px 0 30px;display:flex;flex-direction:column;gap:16px}
.research-pts li{position:relative;padding-left:26px;font-size:15.5px;color:var(--muted);line-height:1.55}
.research-pts li b{color:var(--ink);font-weight:560}
.research-pts li code{font-family:var(--mono);font-size:.82em;background:#fff;border:1px solid var(--hairline-2);padding:1px 6px;border-radius:6px;color:var(--primary-ink)}
.research-pts li::before{content:"";position:absolute;left:0;top:8px;width:13px;height:13px;border-radius:50%;background:var(--c-teal);box-shadow:0 0 0 4px var(--c-teal-wash)}
.research-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ── the decision (math) ─────────────────────────────────── */
.math{padding:var(--sec) 0}
.formula-band{text-align:center;margin-bottom:30px;padding:clamp(30px,5vw,50px) 24px;
  background:radial-gradient(120% 110% at 50% 0%,var(--tint) 0%,var(--canvas-alt) 72%);border:1px solid var(--hairline);border-radius:var(--r-l)}
.formula{font-size:clamp(21px,4.3vw,40px);letter-spacing:-0.01em;color:var(--ink);font-weight:480;line-height:1.4}
.formula .bb{font-weight:560}
.formula .m-op{color:var(--muted);margin:0 .1em}
.formula .t-skip{color:var(--muted)}
.formula .t-act{color:var(--primary)}
.formula i{font-style:italic}
.formula .m-then{color:var(--primary-ink);font-weight:600;white-space:nowrap}
.formula-key{display:flex;gap:8px 30px;justify-content:center;flex-wrap:wrap;margin-top:24px;font-size:13px;color:var(--muted)}
.formula-key span{display:inline-flex;align-items:baseline;gap:7px}
.formula-key b{color:var(--ink);font-weight:600;font-family:var(--mono);font-size:.88em}
.math-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:24px;align-items:stretch}
.gate-fig,.math-work{margin:0;background:#fff;border:1px solid var(--hairline-2);border-radius:var(--r-l);padding:clamp(22px,3vw,30px);box-shadow:var(--shadow-sm)}
.math-work{display:flex;flex-direction:column}
.work-q{font-size:16px;font-weight:600;color:var(--ink);margin-bottom:18px;letter-spacing:-0.02em}
.work-steps{list-style:none;padding:0;margin:0 0 18px;display:flex;flex-direction:column}
.work-steps li{display:flex;justify-content:space-between;gap:16px;align-items:baseline;border-top:1px solid var(--hairline);padding:11px 0;font-size:14.5px}
.work-steps li:first-child{border-top:0;padding-top:2px}
.ws-k{color:var(--muted)}
.ws-v{font-family:var(--mono);color:var(--ink);font-weight:540;white-space:nowrap;font-size:13px}
.work-bar{display:flex;flex-direction:column;gap:9px;margin:auto 0 18px}
.wb-row{display:flex;align-items:center;gap:12px;font-size:13px}
.wb-lab{color:var(--muted);width:72px;flex:none}
.wb-track{flex:1;height:12px;background:var(--canvas-alt);border-radius:6px;overflow:hidden}
.wb-fill{display:block;height:100%;border-radius:6px;transform-origin:left;transform:scaleX(0);transition:transform 1s var(--ease)}
.math-work.in .wb-fill{transform:scaleX(1)}
.wb-before{background:var(--lav)}
.wb-after{background:var(--primary)}
.wb-row b{font-family:var(--mono);font-weight:700;color:var(--ink);width:38px;text-align:right;flex:none}
.work-concl{font-size:14.5px;color:var(--ink-2);line-height:1.55}
.work-concl b{color:var(--primary-ink)}
.work-rule{font-family:var(--mono);font-size:11.5px;color:var(--faint)}

/* ── any tool ────────────────────────────────────────────── */
.tools{padding:var(--sec) 0}
.tool-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:0 48px}
.tool-list li{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:16px 4px;border-top:1px solid var(--hairline)}
.tool-list li span{font-weight:540;font-size:16px;color:var(--ink);letter-spacing:-0.02em}
.tool-list li small{color:var(--muted);font-size:13.5px}
.tool-list li small code{font-family:var(--mono);font-size:.95em;color:var(--primary-ink)}

/* ── install ─────────────────────────────────────────────── */
.install{padding:var(--sec) 0;border-top:1px solid var(--hairline)}
.install-in{position:relative;text-align:center;max-width:720px;margin-inline:auto;
  background:radial-gradient(120% 90% at 50% 0%, var(--tint) 0%, #fff 60%);
  border:1px solid var(--hairline-2);border-radius:var(--r-l);padding:clamp(40px,6vw,68px) clamp(24px,5vw,56px);box-shadow:var(--shadow-sm)}
.install-mark{width:60px;height:60px;color:var(--primary);margin-bottom:24px}

/* ── FAQ ──────────────────────────────────────────────────── */
.faq{padding:var(--sec) 0;background:var(--canvas)}
.faq-list{max-width:760px;display:flex;flex-direction:column;gap:12px}
.faq-item{border:1px solid var(--hairline);border-radius:var(--r-m);background:#fff;overflow:hidden;transition:border-color .2s var(--ease),background .2s var(--ease)}
.faq-item[open]{border-color:var(--hairline-2);background:var(--canvas-alt)}
.faq-item summary{cursor:pointer;list-style:none;position:relative;padding:20px 56px 20px 24px;font-size:clamp(16px,1.9vw,18px);font-weight:560;color:var(--ink)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{background:var(--canvas-alt);color:var(--primary-ink)}
.faq-item summary::after{content:"+";position:absolute;right:24px;top:50%;transform:translateY(-50%);font-size:24px;font-weight:400;line-height:1;color:var(--primary)}
.faq-item[open] summary::after{content:"−"}
.faq-item summary:focus-visible{outline:2px solid var(--primary);outline-offset:-2px;border-radius:var(--r-m)}
.faq-a{padding:0 24px 22px;color:var(--muted);line-height:1.62;font-size:clamp(15px,1.8vw,17px)}
.faq-a code{font-family:var(--mono);font-size:.86em;background:var(--tint);color:var(--primary-ink);padding:2px 6px;border-radius:6px}
.faq-a a{color:var(--primary-ink);font-weight:500}
.install-title{font-size:clamp(28px,4vw,42px);letter-spacing:-0.035em;margin-bottom:14px}
.install-sub{font-size:17px;color:var(--muted);line-height:1.55;max-width:520px;margin:0 auto 30px;font-weight:420}
.install-cmds{display:flex;flex-direction:column;gap:10px;margin-bottom:28px;text-align:left}
.cmd{display:flex;align-items:center;gap:14px;background:var(--canvas-ink);border-radius:13px;padding:6px 6px 6px 18px;
  font-family:var(--mono);font-size:14px;box-shadow:var(--shadow-sm)}
.cmd code{color:#f3f1fb;flex:1;overflow-x:auto;white-space:nowrap}
.cmd .muted{color:#7d78a0;margin-right:12px;font-weight:600}
.install-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:22px}
.install-note{font-size:13.5px;color:var(--faint)}

/* ── footer ──────────────────────────────────────────────── */
.foot{border-top:1px solid var(--hairline);padding:56px 0 40px;background:var(--canvas-alt)}
.foot-in{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;margin-bottom:34px}
.foot-brand{max-width:340px}
.foot-brand p{margin-top:14px;font-size:14px;color:var(--muted);line-height:1.5}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px;align-content:start}
.foot-links a{font-size:14.5px;color:var(--ink-2);font-weight:480;transition:color .15s}
.foot-links a:hover{color:var(--primary-ink)}
.foot-base{display:flex;gap:8px 26px;flex-wrap:wrap;padding-top:24px;border-top:1px solid var(--hairline);
  font-size:13px;color:var(--faint)}

/* ── micro-motion (tasteful, reduced-motion gated) ───────── */
@media (prefers-reduced-motion:no-preference){
  .hero-cmd code::after{content:"";display:inline-block;width:8px;height:1.05em;margin-left:6px;vertical-align:-2px;background:var(--lav);border-radius:1px;animation:blink 1.15s step-end infinite}
  .eyebrow .dot{animation:dotPulse 2.6s ease-in-out infinite}
  .install-mark{transition:transform .6s var(--ease)}
  .install-in:hover .install-mark{transform:rotate(90deg)}
}
@keyframes blink{0%,50%{opacity:1}50.01%,100%{opacity:0}}
@keyframes dotPulse{0%,100%{box-shadow:0 0 0 4px var(--tint)}50%{box-shadow:0 0 0 7px rgba(122,61,255,.14)}}

/* ── reveal ──────────────────────────────────────────────── */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
}

/* ── responsive ──────────────────────────────────────────── */
@media (max-width:900px){
  .nav-links{display:none}
  .nav-cta{display:flex;margin-inline-start:auto;gap:8px}
  .nav-cta .btn.ghost{display:none}
  .nav-cta .btn.primary{padding:9px 16px;font-size:13.5px}
  .nav-toggle{display:flex;margin-inline-start:10px}
  .nav.open{background:#fff;backdrop-filter:none;border-bottom-color:var(--hairline)}
  .nav.open .mobile-menu{display:flex}
  .research-in{grid-template-columns:1fr;gap:36px}
  .math-grid{grid-template-columns:1fr;gap:18px}
  .flow{max-width:100%}
  .flow-node,.flow-spec,.flow-core{max-width:100%}
  .flow-node.router{padding:16px 20px;gap:13px}
  .flow-node.router small{font-size:11.5px;word-break:break-word}
  .grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  body{font-size:16px}
  .hero{padding:124px 0 72px}
  .cmp-row{grid-template-columns:1fr;gap:6px;padding:18px 20px}
  /* keep column headers in the a11y tree on mobile, hidden visually */
  .cmp-h{position:absolute;width:1px;height:1px;padding:0;margin:-1px;border:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
  .cmp-k{font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--primary-ink)}
  .cmp-row .cmp-f{padding-left:26px}
  .grid{grid-template-columns:1fr}
  .tool-list{grid-template-columns:1fr;gap:0}
  .tool-list li{flex-wrap:wrap;gap:2px 16px}
  .tool-list li small{flex-basis:100%}
  .foot-base{flex-direction:column;gap:6px}
  .strip-in{gap:10px 14px;font-size:12.5px}
  .core-kicker{font-size:10px;letter-spacing:.18em}
}
@media (max-width:380px){
  .hero-cmd{font-size:12.5px;padding-left:14px}
}