:root { color-scheme:light; --black:#000; --white:#fff; --muted:#505050; --paper:#f7f7f7; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; scroll-padding-top:24px; }
body { margin:0; color:var(--black); background:var(--white); font-family:Arial,Helvetica,sans-serif; font-size:16px; line-height:1.6; }
a { color:inherit; text-decoration:none; }
a:hover { text-decoration:underline; text-underline-offset:5px; }
button,input,select { font:inherit; }
button { cursor:pointer; }
:focus-visible { outline:3px solid var(--black); outline-offset:4px; }
.skip { position:fixed; top:-100px; left:12px; background:white; padding:12px; z-index:10; }
.skip:focus { top:10px; }
.wrap { max-width:1200px; margin:auto; padding-inline:48px; }
header { max-width:1200px; padding:20px 48px; margin:auto; display:flex; align-items:center; justify-content:space-between; gap:24px; border-bottom:1px solid #000; }
.brand { font-size:28px; font-weight:800; letter-spacing:-1.5px; display:inline-flex; align-items:center; gap:3px; }
.mark { font-size:29px; margin-right:7px; }
.dot { color:var(--black); }
nav { display:flex; flex-wrap:wrap; align-items:center; gap:8px 24px; font-size:14px; }
nav a { display:inline-flex; align-items:center; min-height:44px; }
nav .active{color:#000;text-decoration:underline;text-decoration-color:var(--black);text-underline-offset:6px}
.mono,.eyebrow,small,dt { font-family:ui-monospace,SFMono-Regular,Consolas,monospace; font-size:12px; letter-spacing:.5px; }
.eyebrow { font-weight:600; display:flex; flex-wrap:wrap; align-items:center; gap:10px; margin-bottom:20px; }
.signal { display:inline-block; width:7px; height:7px; background:var(--black); flex-shrink:0; }
.edition { margin-left:auto; color:var(--muted); }
h1 { font-size:clamp(42px,6vw,80px); line-height:1.08; letter-spacing:-.045em; font-weight:500; margin:28px 0; }
h1 em { font-family:Georgia,'Times New Roman',serif; font-weight:400; }
h2 { font-size:clamp(30px,3.2vw,44px); line-height:1.16; letter-spacing:-.035em; font-weight:500; margin:0 0 20px; }
h3 { font-size:21px; line-height:1.3; letter-spacing:-.02em; font-weight:600; }
p { color:var(--muted); font-size:16px; max-width:65ch; }
.hero { padding-top:36px; padding-bottom:28px; }
.hero-bottom { display:flex; justify-content:space-between; align-items:center; gap:24px; }
.hero-bottom p { font-size:18px; }
.hero-actions { display:flex; flex-wrap:wrap; align-items:flex-start; flex-direction:column; gap:10px; }
.button,.outline-button { display:inline-flex; align-items:center; justify-content:center; gap:12px; width:fit-content; max-width:100%; min-height:44px; padding:10px 16px; border:1px solid #000; border-radius:0; font-size:14px; font-weight:600; line-height:1.5; text-align:center; white-space:normal; }
.button { background:var(--black); color:#fff; border-color:var(--black); font-size:19px; font-weight:700; line-height:1.25; }
.button:hover { background:var(--black); color:#fff; border-color:#000; text-decoration:none; }
.button span { color:inherit; }
.button:focus-visible { outline:3px solid #000; outline-offset:4px; }
.button:active { background:var(--black); color:#fff; box-shadow:inset 0 0 0 2px #000; }
.button:disabled,.button[aria-disabled="true"] { background:#505050; color:#fff; border-color:#505050; opacity:1; cursor:not-allowed; box-shadow:none; }
.outline-button { background:white; color:black; margin:0; }
.outline-button:hover { background:var(--paper); }
.text-link { display:inline-flex; align-items:center; min-height:44px; font-size:14px; text-decoration:underline; text-underline-offset:4px; }
.hero-note { margin-top:16px; }
.section { padding-block:48px; border-top:1px solid #000; scroll-margin-top:16px; }
.section-top { display:flex; flex-wrap:wrap; justify-content:space-between; gap:12px; align-items:center; margin-bottom:24px; }
.section-top .eyebrow { margin:0; }
.split { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr); gap:48px; align-items:start; }
.split>p { margin-top:0; }
.steps,.principles,.models { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:28px; margin-top:24px; }
.steps article { border-top:1px solid #000; padding-top:18px; }
.models article { border:1px solid #000; padding:20px; }
.model-symbol { font-family:Georgia,serif; font-size:28px; }
.models small { display:block; }
.steps h3 { margin:12px 0; }
.steps p,.principles p,.roadmap p { font-size:16px; }
.step-number{color:#000;border-left:2px solid var(--black);padding-left:8px}
.paths { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:24px; margin:16px 0; }
.paths article { border-top:1px solid #000; }
.paths h3 { font-size:19px; }
.paths p { font-size:15px; }
.status { border:1px solid black; padding:5px 8px; display:inline-block; font:12px monospace; letter-spacing:.5px; }
.planned { border-style:dashed; color:var(--muted); }
.help,small { font-size:14px; line-height:1.6; margin:0; color:var(--muted); letter-spacing:0; }
.preview-section { background:var(--paper); border-top:1px solid black; border-bottom:1px solid black; }
.preview-section .section { border:0; }
.demo { display:grid; grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr); border:1px solid black; margin-top:24px; background:white; }
form { padding:24px; border-right:1px solid black; display:flex; flex-direction:column; align-items:stretch; gap:10px; min-width:0; }
.demo-label { margin-bottom:12px; }
label { font-size:15px; font-weight:600; margin-top:9px; }
select,input { background:white; border:1px solid black; border-radius:0; padding:10px; color:black; width:100%; min-width:0; min-height:44px; }
form .button { margin-top:14px; align-self:flex-start; }
.receipt { padding:24px; min-width:0; }
.receipt-top { display:flex; flex-wrap:wrap; justify-content:space-between; gap:10px; border-bottom:1px solid black; padding-bottom:16px; }
.receipt h3 { font-size:28px; margin:20px 0 3px; }
.receipt>p { margin-top:0; }
.receipt dl { display:grid; grid-template-columns:minmax(0,130px) minmax(0,1fr); gap:18px 14px; margin:24px 0; }
dt { color:var(--muted); }
dd { margin:0; font:14px/1.65 monospace; overflow-wrap:anywhere; }
.receipt-bottom { display:flex; gap:9px; align-items:center; border-top:1px solid black; padding-top:16px; margin-bottom:14px; font:14px/1.6 monospace; }
.paper { border:1px solid black; padding:24px; }
.paper pre { font:14px/1.8 monospace; white-space:pre-wrap; overflow-wrap:anywhere; margin:24px 0; }
.paper pre span { font-weight:bold; }
.principles>article>span { color:var(--black); font-size:26px; }
.roadmap { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); margin-top:24px; border-top:1px solid black; border-left:1px solid black; }
.roadmap>div,.roadmap>article { border-right:1px solid black; border-bottom:1px solid black; padding:24px; }
.faq-grid { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1.3fr); gap:40px; }
details { border-top:1px solid #000; }
details:last-child { border-bottom:1px solid #000; }
summary { cursor:pointer; padding:16px 20px 16px 0; min-height:44px; font-size:16px; }
details p { font-size:16px; margin:0 0 20px; }
.start { text-align:center; }
.start .eyebrow { justify-content:center; }
.start p { margin:0 auto 20px; }
.cta-actions { display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:12px 24px; }
.start>.button,.start>.outline-button { margin:6px; vertical-align:middle; }
.start .help { margin:12px auto 0; }
footer { border-top:1px solid black; padding-block:24px; display:flex; flex-wrap:wrap; justify-content:space-between; align-items:center; gap:16px; }
footer p { font-size:14px; }
.wizard { display:grid; grid-template-columns:minmax(0,220px) minmax(0,1fr); border:1px solid #000; margin-top:24px; }
.wizard aside { padding:24px; border-right:1px solid #000; }
.wizard ol { padding-left:20px; font-size:14px; line-height:2.4; margin:20px 0; }
.wizard li[aria-current] { color:#000; font-weight:bold; text-decoration:underline; text-decoration-color:var(--black); text-underline-offset:6px; }
.wizard li.complete { color:var(--muted); }
.wizard-content { padding:28px; display:flex; flex-direction:column; align-items:stretch; min-width:0; }
.wizard-content h3 { font-size:28px; margin-bottom:5px; }
.wizard-example { white-space:pre-line; overflow-wrap:anywhere; font:14px/1.8 monospace; border-left:3px solid var(--black); padding:16px; margin:20px 0; background:var(--paper); }
.wizard-actions { display:flex; flex-wrap:wrap; justify-content:space-between; gap:12px; margin-top:16px; }
button:disabled { opacity:.5; cursor:default; }
#wizard-options label { display:block; margin:15px 0 8px; }
#wizard-error { font-size:14px; color:#000; font-weight:bold; }
#early-form { border:1px solid black; }
.guide-intro h1 { font-size:clamp(36px,5vw,60px); }
.guide-nav { margin-top:24px; }
/* Allow grid and flex children to shrink without clipping meaningful content. */
article,.split>div,.hero-actions { min-width:0; }
h1,h2,h3,.mono,.eyebrow,small,summary,.button,.outline-button { overflow-wrap:anywhere; }
@media(max-width:1024px) {
 .wrap { padding-inline:32px; }
 header { padding-inline:32px; }
 .paths { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .split { gap:32px; }
 .receipt dl { grid-template-columns:minmax(0,1fr); gap:6px; }
 .receipt dd { margin-bottom:12px; }
}
@media(max-width:768px) {
 .hero-bottom { flex-direction:column; align-items:flex-start; gap:12px; }
 .desktop { display:none; }
 .split,.faq-grid,.demo { grid-template-columns:minmax(0,1fr); gap:20px; }
 .demo { gap:0; }
 form { border-right:0; border-bottom:1px solid black; }
 .wizard { grid-template-columns:minmax(0,1fr); }
 .wizard aside { border-right:0; border-bottom:1px solid #000; }
 .wizard ol { display:flex; gap:8px 16px; flex-wrap:wrap; list-style:none; padding:0; line-height:1.8; margin:16px 0; }
}
@media(max-width:560px) {
 .wrap { padding-inline:20px; }
 header { padding:16px 20px; flex-wrap:wrap; gap:8px; }
 header nav { width:100%; justify-content:space-between; gap:8px; }
 .hero { padding-top:28px; }
 .edition { margin-left:0; }
 .section { padding-block:36px; }
 .diagram-note { position:static; }
 .hero-actions { width:100%; }
 .hero-actions .button { align-self:flex-start; }
 .cta-actions { flex-direction:column; }
 .cta-actions .button { width:fit-content; }
 .paper,.receipt,form,.wizard-content,.wizard aside { padding:20px; }
 footer p { width:100%; margin:0; }
}
@media(prefers-reduced-motion:reduce) {
 html { scroll-behavior:auto; }
 *,*::before,*::after { animation:none!important; transition:none!important; }
}

/* Architecture uses live HTML text; no image/font downloads or fixed-width canvas. */
.architecture { margin:28px 0 0; max-width:100%; }
.architecture-layer { border:1px solid #000; padding:16px 20px; min-width:0; }
.architecture-layer h2 { font-size:18px; font-weight:600; letter-spacing:0; margin:0 0 8px; }
.architecture-layer p { margin:6px 0 0; font-size:15px; }
.architecture-heading { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:8px; }
.architecture-heading h2 { font-size:25px; margin:0; }
.skeptic-layer { border-left:3px solid var(--black); background:var(--paper); }
.architecture-items { list-style:none; padding:0; margin:8px 0 0; display:flex; flex-wrap:wrap; gap:8px 24px; font-size:15px; }
.architecture-arrow { text-align:center; font-size:22px; line-height:1.4; color:#000; }
.capability-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:12px 20px; list-style:none; padding:0; margin:14px 0 0; }
.capability-grid strong { display:block; font-size:15px; font-weight:600; }
.capability-grid span { display:block; color:var(--muted); font-size:14px; line-height:1.5; }
.architecture figcaption { font-size:14px; line-height:1.6; color:var(--muted); margin-top:12px; max-width:80ch; }
.guide-architecture { margin-top:32px; }
.guide-architecture>h3 { margin:0 0 16px; }
@media(max-width:768px) { .capability-grid { grid-template-columns:repeat(2,minmax(0,1fr)); } }
@media(max-width:560px) {
 .architecture-layer { padding:14px 16px; }
 .capability-grid { gap:10px 16px; }
 .architecture-items { gap:6px 16px; }
}

@media(max-width:360px) { .capability-grid { grid-template-columns:minmax(0,1fr); } }

/* Homepage-only architecture treatment; guide diagrams retain their existing layout. */
.premium-architecture { margin-top:40px; }
.premium-architecture .architecture-layer { border:0; padding:0; background:#fff; }
.premium-architecture .layer-label { font:600 12px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace; letter-spacing:1px; color:var(--muted); margin-bottom:10px; }
.premium-architecture .architecture-layer h2 { font-size:23px; letter-spacing:-.025em; margin-bottom:16px; }
.premium-architecture .skeptic-layer { border:1px solid #dedede; border-top:3px solid var(--black); border-radius:12px; padding:24px; box-shadow:0 8px 28px #00000006; }
.premium-architecture .architecture-heading h2 { font-size:34px; margin:0; }
.architecture-dot { color:var(--black); }
.premium-architecture .architecture-subtitle { font-size:17px; margin:8px 0 24px; }
.premium-architecture .architecture-items { display:grid; gap:12px; margin:0; }
.premium-architecture .knowledge-cards { grid-template-columns:repeat(4,minmax(0,1fr)); }
.premium-architecture .model-cards { grid-template-columns:repeat(3,minmax(0,1fr)); }
.premium-architecture li { min-width:0; overflow-wrap:anywhere; }
.premium-architecture .architecture-items li { display:flex; align-items:center; gap:12px; border:1px solid #e5e5e5; border-radius:8px; padding:16px; background:#fafafa; }
.premium-architecture .architecture-items strong { display:block; font-size:16px; }
.premium-architecture .architecture-items span { display:block; font-size:14px; color:var(--muted); }
.architecture-icon { display:block; width:24px; height:24px; flex:0 0 24px; color:#000; }
.premium-architecture .architecture-arrow { display:flex; justify-content:center; padding:16px 0; }
.premium-architecture .architecture-arrow .architecture-icon { height:32px; color:var(--black); }
.premium-architecture .capability-grid { gap:12px; margin:0; }
.premium-architecture .capability-grid li { border:1px solid #e5e5e5; border-radius:8px; padding:18px; display:flex; flex-direction:column; gap:12px; }
.premium-architecture .capability-grid strong { font-size:16px; margin-bottom:8px; }
.premium-architecture .capability-grid span { font-size:14px; color:#505050; border-left:2px solid #b9b9b9; padding-left:8px; }
.premium-architecture .capability-grid p { font-size:15px; line-height:1.5; margin:12px 0 0; }
.premium-architecture figcaption { margin-top:18px; }
@media(max-width:768px) {
 .premium-architecture .knowledge-cards { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .premium-architecture .model-cards { grid-template-columns:minmax(0,1fr); }
}
@media(max-width:560px) {
 .premium-architecture .skeptic-layer { padding:18px; }
 .premium-architecture .capability-grid { grid-template-columns:minmax(0,1fr); }
 .premium-architecture .capability-grid li { flex-direction:row; gap:12px; padding:16px; }
 .premium-architecture .architecture-items li { padding:12px; gap:8px; }
}
@media(max-width:360px) { .premium-architecture .knowledge-cards { grid-template-columns:minmax(0,1fr); } }

input { accent-color:var(--black); }
::selection { background:#000; color:#fff; }