:root {
  color-scheme: dark;
  --bg: #0b0f0e;
  --surface: #121816;
  --border: #24302c;
  --border-strong: #384840;
  --text: #e7eee9;
  --muted: #9aa8a1;
  --accent: #c6f25a;
  --warning: #e6b84f;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --shell: 72rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 18px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; transition: color 180ms ease; }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
code { font-family: var(--mono); color: var(--accent); font-size: .9em; }
.shell { width: min(calc(100% - 3rem), var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; top: .75rem; left: .75rem; z-index: 100; padding: .6rem .9rem; background: var(--accent); color: var(--bg); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: absolute; inset: 0 0 auto; z-index: 10; border-bottom: 1px solid rgba(56,72,64,.55); }
.header-inner { min-height: 4.75rem; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 2rem; }
.wordmark { display: inline-flex; align-items: center; gap: .7rem; width: max-content; font: 600 1rem/1 var(--mono); letter-spacing: -.02em; }
.wordmark span, .footer-mark { width: .52rem; height: .52rem; background: var(--accent); display: inline-block; }
nav { display: flex; gap: 1.75rem; color: var(--muted); font: 500 .75rem/1 var(--mono); }
nav a:hover, footer a:hover { text-decoration: underline; text-underline-offset: .3rem; }
.status-link { justify-self: end; display: flex; align-items: center; gap: .6rem; color: var(--muted); font: 500 .74rem/1 var(--mono); }
.status-link span { width: .45rem; height: .45rem; border-radius: 50%; background: var(--warning); box-shadow: 0 0 0 4px rgba(230,184,79,.1); }

.hero { min-height: 100svh; display: grid; align-items: center; padding: 9rem 0 5rem; overflow: hidden; background-image: linear-gradient(rgba(36,48,44,.16) 1px, transparent 1px), linear-gradient(90deg, rgba(36,48,44,.14) 1px, transparent 1px); background-size: 4rem 4rem; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(27rem, .97fr); gap: clamp(3rem, 6vw, 6rem); align-items: center; }
.eyebrow, .section-index { margin: 0 0 1.5rem; color: var(--accent); font: 600 .72rem/1.4 var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.eyebrow i { padding: 0 .55rem; color: var(--border-strong); font-style: normal; }
h1 { max-width: 11ch; margin: 0; font: 600 clamp(3.2rem, 6.5vw, 6rem)/.96 var(--sans); letter-spacing: -.065em; }
.lead { max-width: 62ch; margin: 2rem 0 0; color: #c7d1cb; font-size: 1.08rem; }
.lead-secondary { max-width: 62ch; margin: .85rem 0 0; color: var(--muted); font-size: .94rem; }
.hero-actions { margin-top: 2.1rem; display: flex; align-items: center; gap: 1.6rem; font: 500 .78rem/1.3 var(--mono); color: var(--muted); }
.primary-link { display: inline-flex; gap: .85rem; align-items: center; padding-bottom: .35rem; color: var(--text); border-bottom: 1px solid var(--accent); }

.terminal { min-width: 0; border: 1px solid var(--border-strong); background: rgba(18,24,22,.96); box-shadow: 1.25rem 1.25rem 0 rgba(0,0,0,.24); font-family: var(--mono); transform: translateY(1rem); }
.terminal-bar { height: 2.65rem; display: flex; align-items: center; gap: .45rem; padding: 0 1rem; border-bottom: 1px solid var(--border); background: #0f1412; }
.terminal-bar span { width: .52rem; height: .52rem; border-radius: 50%; background: var(--border-strong); }
.terminal-bar strong { margin-left: auto; margin-right: auto; color: var(--muted); font-size: .68rem; font-weight: 500; transform: translateX(-1rem); }
.terminal-body { padding: 1.55rem; overflow: hidden; color: #acb9b2; font-size: clamp(.68rem, 1vw, .82rem); line-height: 1.75; }
.terminal-body p { margin: 0; white-space: nowrap; }
.terminal-body b, .terminal-body em { color: var(--accent); font-style: normal; font-weight: 600; }
.terminal-body strong { color: var(--text); font-weight: 500; }
.terminal-body q, .terminal dd { color: #d5ddd8; }
.terminal-section { padding-top: 1.2rem; color: var(--accent); }
.terminal dl { display: grid; grid-template-columns: 5.6rem 1fr; margin: 0; }
.terminal dt { color: var(--muted); }
.terminal dd { margin: 0; white-space: nowrap; }
.terminal mark { padding: .08rem .35rem; background: rgba(230,184,79,.12); color: var(--warning); }
.cursor { display: inline-block; width: .5em; height: 1.05em; margin-left: .25rem; vertical-align: -.14em; background: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.section { border-top: 1px solid var(--border); padding: clamp(5.5rem, 10vw, 9rem) 0; }
.section-heading { max-width: 43rem; margin-bottom: 3.5rem; }
.section-heading h2, .status-section h2 { margin: 0; font-size: clamp(2.3rem, 4.5vw, 4rem); line-height: 1.03; letter-spacing: -.05em; }
.section-heading > p:last-child { max-width: 48ch; margin: 1.25rem 0 0; color: var(--muted); }
.problem-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--border); border-left: 1px solid var(--border); }
.problem-grid article { min-height: 16rem; padding: 2rem; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.problem-grid article > span, .model-list > li > span { color: var(--accent); font: 600 .68rem/1 var(--mono); }
h3 { margin: 2.8rem 0 .8rem; font-size: 1.18rem; letter-spacing: -.025em; }
.problem-grid p, .principles-grid p { max-width: 48ch; margin: 0; color: var(--muted); font-size: .9rem; }
.section-close { margin: 2rem 0 0; color: var(--accent); font: 500 .8rem/1.5 var(--mono); text-align: right; }

.model-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 1rem 6rem; align-items: start; }
.sticky-heading { position: sticky; top: 3rem; }
.model-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--border); }
.model-list li { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; padding: 2rem 0; border-bottom: 1px solid var(--border); }
.model-list h3 { margin: -.35rem 0 .65rem; }
.model-list p { max-width: 51ch; margin: 0; color: var(--muted); font-size: .9rem; }
.model-note { grid-column: 2; margin: 1.5rem 0 0; padding-left: 4rem; color: var(--muted); font-size: .75rem; }

.scope-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.scope-card { padding: 2rem; border: 1px solid var(--border); background: var(--surface); }
.scope-label { display: flex; align-items: center; gap: .7rem; margin: 0 0 2rem; font: 600 .74rem/1 var(--mono); }
.scope-label span { width: .55rem; height: .55rem; border-radius: 50%; background: var(--accent); }
.out-scope .scope-label span { background: var(--warning); }
.scope-card ul { margin: 0; padding: 0; list-style: none; }
.scope-card li { position: relative; padding: .85rem 0 .85rem 1.4rem; border-top: 1px solid var(--border); color: #c7d1cb; font-size: .88rem; }
.scope-card li::before { content: "+"; position: absolute; left: 0; color: var(--accent); font-family: var(--mono); }
.out-scope li::before { content: "−"; color: var(--warning); }

.principles-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--border); }
.principles-grid article { padding: 0 2rem 2.5rem 0; border-bottom: 1px solid var(--border); }
.principles-grid article:not(:nth-child(3n + 1)) { padding-left: 2rem; border-left: 1px solid var(--border); }
.principles-grid h3 { max-width: 18ch; margin-top: 2.5rem; }

.status-section { background: var(--surface); }
.status-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 8vw, 8rem); }
.status-lead { margin: 2rem 0 1rem; color: #c7d1cb; font-size: 1.05rem; }
.status-lead + p { color: var(--muted); font-size: .9rem; }
.status-lead + p + p { color: var(--muted); font-size: .9rem; }
.source-links { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.source-link { display: inline-block; margin-top: 1.5rem; border-bottom: 1px solid var(--accent); font: 500 .8rem/2 var(--mono); }
.metadata { margin: 0; align-self: center; border-top: 1px solid var(--border-strong); font: .72rem/1.5 var(--mono); }
.metadata div { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; padding: .85rem 0; border-bottom: 1px solid var(--border); }
.metadata dt { color: var(--accent); }
.metadata dd { margin: 0; color: #bdc8c2; }

footer { border-top: 1px solid var(--border); padding: 2rem 0; color: var(--muted); font: .68rem/1.5 var(--mono); }
.footer-inner { display: grid; grid-template-columns: 1fr auto 1fr; gap: 2rem; align-items: center; }
.footer-inner p { margin: 0; }
.footer-inner p:first-child { display: flex; align-items: center; gap: .65rem; color: var(--text); }
.footer-links { justify-self: end; display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1.25rem; }
.footer-mark { width: .4rem; height: .4rem; }

@media (max-width: 920px) {
  .header-inner { grid-template-columns: 1fr auto; }
  nav { grid-column: 1 / -1; grid-row: 2; padding: 1rem 0; border-top: 1px solid var(--border); justify-content: space-between; }
  .site-header { background: rgba(11,15,14,.94); }
  .hero { padding-top: 11rem; }
  .hero-grid, .model-layout, .status-grid { grid-template-columns: 1fr; }
  .terminal { max-width: 38rem; transform: none; }
  .sticky-heading { position: static; }
  .model-note { grid-column: 1; }
  .principles-grid { grid-template-columns: repeat(2, 1fr); }
  .principles-grid article:not(:nth-child(3n + 1)) { padding-left: 0; border-left: 0; }
  .principles-grid article:nth-child(even) { padding-left: 2rem; border-left: 1px solid var(--border); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .shell { width: min(calc(100% - 2.5rem), var(--shell)); }
  .header-inner { gap: 1rem; min-height: 4rem; }
  .status-link { font-size: .64rem; }
  nav { gap: .5rem; overflow-x: auto; font-size: .64rem; }
  .hero { min-height: auto; padding: 10rem 0 4.5rem; }
  h1 { font-size: clamp(2.85rem, 14vw, 4rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .terminal { margin-right: -.65rem; box-shadow: .65rem .65rem 0 rgba(0,0,0,.24); }
  .terminal-body { overflow-x: auto; }
  .section { padding: 5rem 0; }
  .section-heading { margin-bottom: 2.5rem; }
  .problem-grid, .scope-grid, .principles-grid { grid-template-columns: 1fr; }
  .problem-grid article { min-height: 0; }
  .principles-grid article, .principles-grid article:nth-child(even), .principles-grid article:not(:nth-child(3n + 1)) { padding-left: 0; border-left: 0; }
  .model-list li { grid-template-columns: 2rem 1fr; }
  .model-note { padding-left: 3rem; }
  .footer-inner { grid-template-columns: 1fr; gap: .6rem; }
  .footer-links { justify-self: start; justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor { animation: none; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}

@media print {
  .site-header { position: static; }
  .hero { min-height: auto; }
  .cursor { display: none; }
}