:root{
  --navy:#0b1626;--navy-2:#13233a;--navy-3:#1f3a5f;
  --ink:#16202e;--ink-2:#3d4757;--muted:#5b6575;
  --line:#dde2ea;--soft:#f4f6f9;--white:#ffffff;
  --amber:#f5a524;--amber-ink:#5a3a00;--amber-soft:#fdf3dc;
  --green:#17663a;--green-soft:#e6f4ea;--red:#a4161a;
  --on-navy:#e8eef7;--on-navy-2:#a9b7cb;
  --radius:12px;--max:1160px;
  --sans:'IBM Plex Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--white);line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy-3)}
a:hover{color:var(--navy)}
code,pre,.mono{font-family:var(--mono)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:16px;background:#fff;padding:8px 12px;z-index:99}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,22,38,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid rgba(255,255,255,.06)}
.nav .wrap{display:flex;align-items:center;gap:24px;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:600;font-size:18px;letter-spacing:-.01em}
.brand:hover{color:#fff}
.brand-mark{width:26px;height:26px}
.brand small{font-weight:400;color:var(--on-navy-2);font-size:14px}
.nav-links{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto;align-items:center}
.nav-links a{color:var(--on-navy);text-decoration:none;font-size:15px;padding:10px 12px;border-radius:8px}
.nav-links a:hover,.nav-links a[aria-current=page]{background:rgba(255,255,255,.08);color:#fff}
.nav-links .btn{margin-left:6px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:16px;padding:12px 20px;border-radius:10px;text-decoration:none;border:1px solid transparent;min-height:44px;line-height:1.2}
.btn-primary{background:var(--amber);color:#1a1200}
.btn-primary:hover{background:#ffb83f;color:#1a1200}
.btn-ghost{border-color:rgba(255,255,255,.28);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08);color:#fff}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--navy-3);color:#fff}
.btn-line{border-color:var(--line);color:var(--ink);background:#fff}
.btn-line:hover{border-color:var(--ink-2);color:var(--ink)}
.nav-links .btn{padding:9px 14px;font-size:15px;min-height:40px}

/* hero */
.hero{background:radial-gradient(1200px 500px at 70% -10%,#1d3557 0%,rgba(29,53,87,0) 60%),var(--navy);color:var(--on-navy);padding:72px 0 0;overflow:hidden}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:500;color:var(--on-navy-2);border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:6px 12px}
.eyebrow b{color:var(--amber);font-weight:600}
.hero h1{font-size:clamp(38px,5.4vw,64px);line-height:1.06;letter-spacing:-.025em;margin:20px 0 18px;color:#fff;font-weight:600;max-width:15ch}
.hero h1 em{font-style:normal;color:var(--amber)}
.hero .lede{font-size:clamp(18px,2vw,21px);color:var(--on-navy);max-width:60ch;margin:0 0 28px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.cta-note{font-size:14px;color:var(--on-navy-2);margin-top:14px}
.cta-note code{color:#fff;background:rgba(255,255,255,.08);padding:2px 6px;border-radius:6px;font-size:13px}
.hero-shot{margin-top:56px;position:relative}
.frame{background:#fff;border-radius:14px 14px 0 0;box-shadow:0 30px 80px rgba(0,0,0,.45);overflow:hidden;border:1px solid rgba(255,255,255,.12);border-bottom:0}
.frame-bar{height:34px;background:#e9edf3;display:flex;align-items:center;gap:7px;padding:0 14px}
.frame-bar i{width:11px;height:11px;border-radius:50%;background:#c6cdd8;display:block}
.frame-bar span{margin-left:12px;font-size:12px;color:var(--muted);font-family:var(--mono);background:#fff;border-radius:6px;padding:3px 10px}
.callout{position:absolute;background:#fff;color:var(--ink);border-radius:10px;padding:10px 14px;font-size:14px;box-shadow:0 10px 30px rgba(0,0,0,.25);max-width:250px;line-height:1.4}
.callout b{display:block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--amber-ink);margin-bottom:2px}
.callout.c1{right:-8px;top:120px}
.callout.c2{left:-8px;bottom:60px}

/* sections */
section{padding:88px 0}
.section-soft{background:var(--soft)}
.kicker{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--navy-3);margin:0 0 10px}
h2{font-size:clamp(30px,3.6vw,44px);line-height:1.12;letter-spacing:-.02em;margin:0 0 16px;font-weight:600;max-width:22ch}
h3{font-size:21px;line-height:1.3;margin:0 0 8px;font-weight:600}
.sub{font-size:19px;color:var(--ink-2);max-width:62ch;margin:0 0 40px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.card p{margin:0;color:var(--ink-2)}
.icon{width:44px;height:44px;border-radius:10px;background:var(--navy);display:grid;place-items:center;margin-bottom:18px}
.icon svg{width:22px;height:22px;stroke:var(--amber);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* contrast */
.versus{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.versus .card h3{display:flex;align-items:center;gap:10px}
.tag{font-size:12px;font-weight:600;padding:3px 9px;border-radius:999px;letter-spacing:.02em}
.tag-grey{background:#eef1f5;color:#3a4556}
.tag-amber{background:var(--amber-soft);color:var(--amber-ink)}
.tag-green{background:var(--green-soft);color:var(--green)}
ul.clean{list-style:none;padding:0;margin:14px 0 0}
ul.clean li{padding:8px 0 8px 28px;position:relative;color:var(--ink-2);border-top:1px solid #eef1f5}
ul.clean li:first-child{border-top:0}
ul.clean li::before{content:"";position:absolute;left:4px;top:17px;width:10px;height:10px;border-radius:50%;background:#c6cdd8}
.versus .good ul.clean li::before{background:var(--amber)}

/* tour */
.tour{display:grid;gap:64px}
.tour-row{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:center}
.tour-row.flip{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.tour-row.flip .tour-text{order:2}
.shot{border-radius:12px;border:1px solid var(--line);box-shadow:0 20px 50px rgba(15,27,45,.14);overflow:hidden;background:#fff}
.step-no{font-family:var(--mono);font-size:13px;color:var(--navy-3);font-weight:500}

/* audience */
.who .card h3{margin-top:4px}
.who .outcome{margin-top:14px;font-weight:500;color:var(--ink)}

/* paths */
.paths{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.path{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;min-height:220px;transition:border-color .15s,transform .15s}
.path:hover{border-color:var(--navy-3);transform:translateY(-2px);color:var(--ink)}
.path .who-for{font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.path p{margin:0;color:var(--ink-2)}
.path .go{margin-top:auto;font-weight:600;color:var(--navy-3)}
.path.here{border-color:var(--amber);background:#fffdf7}

/* honest */
.honest{background:var(--navy);color:var(--on-navy)}
.honest h2{color:#fff}
.honest .sub{color:var(--on-navy-2)}
.honest .card{background:var(--navy-2);border-color:rgba(255,255,255,.08)}
.honest .card h3{color:#fff;font-size:18px}
.honest .card p{color:var(--on-navy-2)}

/* code */
pre{background:var(--navy);color:#e3eaf5;border-radius:10px;padding:18px 20px;overflow-x:auto;font-size:14.5px;line-height:1.6;margin:0}
pre .c{color:#8193ab}
pre .k{color:var(--amber)}
pre .s{color:#9fd8b4}
:not(pre)>code{background:#eef1f5;padding:2px 6px;border-radius:5px;font-size:.88em}
.steps{counter-reset:s;display:grid;gap:28px}
.stepx{display:grid;grid-template-columns:52px minmax(0,1fr);gap:20px}
.stepx::before{counter-increment:s;content:counter(s);width:44px;height:44px;border-radius:50%;background:var(--navy);color:var(--amber);display:grid;place-items:center;font-weight:600;font-size:18px}
.stepx h3{margin-top:8px}
.stepx p{color:var(--ink-2);margin:0 0 12px}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid #eef1f5;vertical-align:top}
th{font-size:13px;color:var(--muted);font-weight:600;background:#fafbfc}
tr:last-child td{border-bottom:0}

/* page header */
.page-hero{background:var(--navy);color:var(--on-navy);padding:64px 0 56px}
.page-hero h1{color:#fff;font-size:clamp(34px,4.6vw,54px);line-height:1.08;letter-spacing:-.02em;margin:16px 0 14px;max-width:20ch;font-weight:600}
.page-hero .lede{font-size:19px;max-width:62ch;color:var(--on-navy);margin:0}
.crumbs{display:flex;gap:8px;flex-wrap:wrap;margin-top:28px}
.crumbs a{font-size:14px;color:var(--on-navy);text-decoration:none;border:1px solid rgba(255,255,255,.16);padding:7px 12px;border-radius:999px}
.crumbs a:hover{background:rgba(255,255,255,.08);color:#fff}

/* diagram */
.chain{display:flex;align-items:center;gap:0;flex-wrap:wrap;margin:8px 0 0}
.rcpt{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;min-width:150px;font-size:14px}
.rcpt b{display:block;font-family:var(--mono);font-size:13px;color:var(--navy-3);margin-bottom:4px}
.rcpt span{display:block;color:var(--muted);font-family:var(--mono);font-size:12px}
.arrow{width:36px;height:2px;background:#9aa6b8;position:relative;margin:0 4px}
.arrow::after{content:"";position:absolute;right:-1px;top:-4px;border-left:8px solid #9aa6b8;border-top:5px solid transparent;border-bottom:5px solid transparent}
.head{background:var(--amber-soft);border-color:#f0d9a6}

/* ladder */
.ladder{display:grid;gap:10px}
.rung{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:16px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px 18px;align-items:start}
.rung h3{font-size:17px;margin:0}
.rung p{margin:0;color:var(--ink-2);font-size:15.5px}

/* cta band */
.band{background:linear-gradient(0deg,var(--navy),#132845);color:#fff;border-radius:18px;padding:52px;display:flex;gap:32px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.band h2{color:#fff;margin:0 0 8px}
.band p{color:var(--on-navy-2);margin:0;max-width:52ch}

/* footer */
footer{background:#08111e;color:var(--on-navy-2);padding:64px 0 40px;font-size:15px}
footer a{color:var(--on-navy);text-decoration:none}
footer a:hover{color:#fff;text-decoration:underline}
.foot-grid{display:grid;grid-template-columns:minmax(0,2fr) repeat(3,minmax(0,1fr));gap:32px}
.foot-grid h4{color:#fff;font-size:14px;margin:0 0 12px;font-weight:600;letter-spacing:.02em}
.foot-grid ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.fine{font-size:13px;color:#7d8ba0;margin-top:40px;border-top:1px solid rgba(255,255,255,.08);padding-top:20px;line-height:1.6}

@media (max-width:900px){
  .grid-3,.paths,.foot-grid{grid-template-columns:minmax(0,1fr)}
  .grid-2,.versus{grid-template-columns:minmax(0,1fr)}
  .tour-row,.tour-row.flip{grid-template-columns:minmax(0,1fr);gap:24px}
  .tour-row.flip .tour-text{order:0}
  .callout{display:none}
  section{padding:64px 0}
  .band{padding:32px}
  .rung{grid-template-columns:minmax(0,1fr);gap:6px}
  .nav-links{margin-left:0;width:100%;padding-bottom:8px}
  .nav .wrap{gap:4px}
}
@media (max-width:520px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .hero{padding-top:48px}
  .nav-links a{padding:8px 9px;font-size:14px}
  .stepx{grid-template-columns:minmax(0,1fr)}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.path{transition:none}}

/* harness diagram */
.harness{position:relative;border:2px solid var(--navy-3);border-radius:18px;padding:44px 24px 24px;background:#fff;margin-top:8px}
.harness-label{position:absolute;top:-15px;left:24px;background:var(--navy);color:#fff;font-size:13px;font-weight:600;padding:6px 14px;border-radius:999px;letter-spacing:.02em}
.harness-label b{color:var(--amber);font-weight:600}
.h-steps{display:flex;align-items:stretch;gap:0}
.h-step{flex:1 1 0;min-width:0;border:1px solid var(--line);border-radius:12px;padding:16px 14px;background:var(--soft);display:flex;flex-direction:column;gap:8px}
.h-step h3{font-size:16px;margin:0}
.h-step .kind{font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.h-step .chip{margin-top:auto;font-size:12.5px;font-family:var(--mono);border-radius:6px;padding:5px 8px;background:#fff;border:1px solid var(--line);color:var(--ink-2)}
.h-step.model{background:var(--amber-soft);border:2px dashed var(--amber)}
.h-step.model .kind{color:var(--amber-ink)}
.h-step.model .chip{border-color:#f0d9a6}
.h-arrow{flex:0 0 28px;display:grid;place-items:center;color:#9aa6b8;font-size:20px}
.h-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:20px;padding-top:18px;border-top:1px dashed var(--line);font-size:15px;color:var(--ink-2)}
.h-foot .pill{font-family:var(--mono);font-size:13px;background:var(--navy);color:#fff;border-radius:8px;padding:6px 10px}
.legend{display:flex;gap:20px;flex-wrap:wrap;margin-top:16px;font-size:14px;color:var(--ink-2)}
.legend span{display:inline-flex;align-items:center;gap:8px}
.sw{width:16px;height:16px;border-radius:4px;border:1px solid var(--line);background:var(--soft);display:inline-block}
.sw.m{background:var(--amber-soft);border:2px dashed var(--amber)}

/* honest-where-it-can't trio */
.trio .card{display:flex;flex-direction:column;gap:12px}
.mini{display:flex;align-items:center;gap:6px;font-family:var(--mono);font-size:13px;flex-wrap:wrap}
.mini i{font-style:normal;border:1px solid var(--line);border-radius:6px;padding:4px 8px;background:var(--soft)}
.mini i.ok{background:var(--green-soft);color:var(--green);border-color:#bfe3cb}
.mini i.am{background:var(--amber-soft);color:var(--amber-ink);border-color:#f0d9a6}
.mini i.rd{background:#fdeaea;color:var(--red);border-color:#f3c4c5}
.mini b{color:#9aa6b8;font-weight:400}

/* governance flow */
.flow{display:grid;grid-template-columns:minmax(0,1fr) 28px minmax(0,1fr) 28px minmax(0,1fr) 28px minmax(0,1.3fr);align-items:center;gap:0}
.f-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;min-height:112px;display:flex;flex-direction:column;justify-content:center;gap:4px}
.f-box h3{font-size:16px;margin:0}
.f-box p{margin:0;font-size:14px;color:var(--ink-2)}
.f-box code{font-size:12.5px}
.f-arrow{text-align:center;color:#9aa6b8;font-size:20px}
.outcomes{display:grid;gap:8px}
.oc{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:14px}
.oc .tag{white-space:nowrap}
.tag-red{background:#fdeaea;color:var(--red)}
.next{margin-top:20px;border:2px dashed #b9c3d1;border-radius:12px;padding:16px 18px;display:flex;gap:14px;align-items:center;flex-wrap:wrap;color:var(--ink-2);font-size:15px;background:#fbfcfd}
.next .tag{background:#eef1f5;color:#3a4556}

@media (max-width:900px){
  .h-steps{flex-direction:column}
  .h-arrow{flex-basis:26px}
  .h-arrow span{display:inline-block;transform:rotate(90deg)}
  .flow{grid-template-columns:minmax(0,1fr)}
  .f-arrow{transform:rotate(90deg);height:28px;line-height:28px}
  .f-box{min-height:0}
  .harness{padding:40px 16px 16px}
}

/* deterministic harness (box around the model) */
.dh{display:flex;align-items:center;gap:0;margin-top:12px}
.dh-arrow{flex:0 0 34px;text-align:center;color:#7f8ea4;font-size:22px}
.dh-node{background:#fff;border:1.5px solid #2f6f73;border-radius:10px;padding:14px 16px;text-align:center;min-width:0}
.dh-node h3{font-size:16px;margin:0}
.dh-node p{margin:4px 0 0;font-size:12.5px;color:var(--muted);line-height:1.45}
.dh-req{border-color:#c9d0db;flex:0 0 120px}
.dh-gate{border-color:var(--amber);border-width:2px;flex:0 0 170px}
.dh-box{flex:1 1 auto;min-width:0;background:#e8f1f1;border:2.5px solid #2f6f73;border-radius:22px;padding:18px 20px;display:flex;flex-direction:column;gap:16px}
.dh-top,.dh-bottom{text-align:center;font-size:13.5px;font-weight:500;color:#245a5d}
.dh-bottom b{font-weight:600}
.dh-row{display:flex;align-items:center}
.dh-row .dh-node{flex:1 1 0}
.dh-llm{flex:1.1 1 0;min-width:0;border:2.5px dashed #b97a2a;background:var(--amber-soft);border-radius:999px;padding:22px 12px;text-align:center;display:flex;flex-direction:column;gap:2px}
.dh-llm b{font-size:24px;color:#9a5d12;letter-spacing:.02em}
.dh-llm span{font-size:13px;color:#9a5d12}
.dh-cards{margin-top:28px}
.dh-card{border-top:4px solid #2f6f73;background:#fff;border-radius:0 0 10px 10px;padding:16px 18px;box-shadow:0 1px 0 var(--line)}
.dh-card.a{border-top-color:#b97a2a}
.dh-card h3{font-size:17px;margin:0 0 4px}
.dh-card p{margin:0;font-size:15px;color:var(--ink-2)}
.dh-note{margin-top:14px;font-size:14px;color:var(--muted)}
@media (max-width:900px){
  .dh,.dh-row{flex-direction:column;align-items:stretch}
  .dh-arrow{flex-basis:30px;line-height:30px}
  .dh-arrow span{display:inline-block;transform:rotate(90deg)}
  .dh-req,.dh-gate{flex-basis:auto}
}