:root {
  color-scheme: light;
  --ink: #17211d;
  --muted: #46554d;
  --faint: #5e6e65;
  --bg: #f8faf9;
  --bg-deep: #eef3f7;
  --panel: #ffffff;
  --line: #c8d4dc;
  --control-line: #687f90;
  --accent: #2d5f8b;
  --accent-strong: #234f76;
  --accent-hover: #173b5a;
  --signal: #9b4c12;
  --signal-vivid: #c66a25;
  --code-bg: #15212b;
  --code-text: #edf4f8;
  --code-muted: #b9c9d5;
  --code-accent: #a8d5f4;
  --code-signal: #f2bc86;
  --code-line: #3b5367;
  --shadow: 0 18px 50px rgba(23, 33, 29, .12);
  --shell: 1160px;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(circle at 82% 8%, rgba(45, 95, 139, .1), transparent 34rem), var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 3px; }
.skip-link { position: fixed; left: 1rem; top: 1rem; z-index: 1000; padding: .7rem 1rem; background: var(--accent-strong); color: #ffffff; font-weight: 800; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.shell { width: min(calc(100% - 2.5rem), var(--shell)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgba(45, 95, 139, .18); background: rgba(248, 250, 249, .92); backdrop-filter: blur(16px); }
.nav-shell { min-height: 4.5rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; min-height: 2.75rem; color: var(--ink); font-weight: 760; text-decoration: none; letter-spacing: -.02em; }
.brand-wordmark { font-size: 1rem; }
.brand-mark { display: inline-grid; flex: 0 0 2.25rem; width: 2.25rem; height: 2.25rem; place-items: center; }
.brand-mark-color { display: block; width: 2.25rem; height: 2.25rem; }
.brand-mark-forced { display: none; width: 2.25rem; height: 2.25rem; background: CanvasText; -webkit-mask: url("/assets/brand/datum-mark-fc985a12fe365b5b.svg") center / contain no-repeat; mask: url("/assets/brand/datum-mark-fc985a12fe365b5b.svg") center / contain no-repeat; }
nav { display: flex; align-items: center; gap: 1.6rem; }
nav a { display: inline-flex; align-items: center; min-height: 2.75rem; color: var(--muted); font-size: .9rem; font-weight: 650; text-decoration: none; }
nav a:hover { color: var(--ink); }
.nav-cta { padding: .62rem .9rem; border: 1px solid var(--control-line); border-radius: .55rem; background: var(--panel); }
.hero { min-height: 40rem; display: grid; grid-template-columns: 1.3fr .7fr; align-items: center; gap: clamp(3rem, 5vw, 5rem); padding-block: clamp(5rem, 9vw, 7.5rem); }
.eyebrow, .section-kicker { margin: 0 0 1.25rem; color: var(--accent); font-family: var(--mono); font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.status-dot { display: inline-block; width: .55rem; height: .55rem; margin-right: .55rem; border-radius: 50%; background: var(--signal-vivid); box-shadow: 0 0 0 .25rem rgba(198, 106, 37, .14); }
h1, h2, h3, p { overflow-wrap: break-word; }
h1 { max-width: 18ch; margin: 0; font-size: clamp(3.1rem, 5.3vw, 4.75rem); line-height: .98; letter-spacing: -.05em; font-weight: 720; }
.hero-product, .hero-product-name, .hero-product-byline, .hero-product-proposition, .hero-assurance-proposition, .hero-guidance { display: block; }
.hero-product-name { margin-bottom: .55rem; color: var(--accent); font-family: var(--mono); font-size: .18em; font-weight: 760; letter-spacing: .08em; line-height: 1; text-transform: uppercase; }
.hero-product-byline { color: var(--muted); font-size: .28em; font-weight: 650; letter-spacing: -.01em; line-height: 1.1; }
.hero-guidance { margin-top: .32em; }
.hero-product-proposition { color: var(--ink); }
.hero-assurance-proposition { margin-top: .38em; color: var(--accent); font-size: .42em; line-height: 1.12; letter-spacing: -.02em; }
.lede { max-width: 42rem; margin: 2rem 0 0; color: var(--muted); font-size: clamp(1.08rem, 2vw, 1.3rem); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: .35rem; min-height: 3rem; padding: .75rem 1.05rem; border: 1px solid transparent; border-radius: .55rem; font-size: .92rem; font-weight: 760; text-decoration: none; }
.button.primary { background: var(--accent-strong); color: #ffffff; }
.button.primary:hover { background: var(--accent-hover); }
.button.secondary { border-color: var(--control-line); color: var(--ink); background: var(--panel); }
.button.secondary:hover { border-color: var(--accent-strong); background: var(--bg-deep); }
.disclosure { margin: 1.2rem 0 0; color: var(--faint); font-size: .82rem; }
.terminal-card { position: relative; border: 1px solid var(--code-line); border-radius: .85rem; background: var(--code-bg); color: var(--code-text); box-shadow: var(--shadow); overflow: hidden; transform: rotate(1deg); }
.terminal-card::before { content: ""; position: absolute; inset: -1px; pointer-events: none; background: linear-gradient(120deg, rgba(168, 213, 244, .08), transparent 40%); }
.terminal-bar { display: flex; gap: .4rem; padding: .8rem 1rem; border-bottom: 1px solid var(--code-line); }
.terminal-bar span { width: .55rem; height: .55rem; border-radius: 50%; background: #4d687b; }
.terminal-body { padding: 1.4rem; color: var(--code-text); font-family: var(--mono); font-size: clamp(.73rem, 1.3vw, .9rem); }
.terminal-body p { margin: 0 0 .9rem; }
.terminal-title { color: var(--code-accent); font-weight: 700; }
.terminal-facts { margin: 0; }
.terminal-facts div { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: .9rem; color: var(--code-muted); }
.terminal-facts dt, .terminal-facts dd { margin: 0; }
.terminal-facts dd { color: var(--code-accent); }
.terminal-body .result { margin-top: 1.5rem; color: var(--code-signal); }
.problem-band { border-block: 1px solid var(--line); background: var(--bg-deep); padding-block: clamp(4rem, 8vw, 6.5rem); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 9vw, 8rem); }
h2 { margin: 0; font-size: clamp(2.1rem, 4.2vw, 4rem); line-height: 1.08; letter-spacing: -.045em; font-weight: 680; }
.problem-copy p { margin: 0 0 1.25rem; color: var(--muted); font-size: 1.05rem; }
.section { padding-block: clamp(5rem, 10vw, 9rem); scroll-margin-top: 5rem; }
.section-heading { max-width: 52rem; }
.section-heading.compact { max-width: 44rem; }
.section-heading > p:not(.section-kicker) { margin: 1.5rem 0 0; color: var(--muted); font-size: 1.08rem; }
.capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 4rem; border: 1px solid var(--line); background: var(--line); }
.capability-grid article { min-height: 18rem; padding: 2rem; background: var(--panel); }
.card-index { color: var(--accent); font-family: var(--mono); font-size: .75rem; }
.capability-grid h3 { margin: 4rem 0 .8rem; font-size: 1.25rem; }
.capability-grid p { margin: 0; color: var(--muted); }
.text-link { display: inline-block; min-height: 2.75rem; margin-top: 2rem; padding-block: .6rem; color: var(--accent); font-weight: 720; text-underline-offset: .25rem; }
.link-tail { white-space: nowrap; }
.text-link code, .footer-links code { font-family: var(--mono); font-size: .9em; }
.assurance-section { border-block: 1px solid var(--line); background: linear-gradient(135deg, var(--panel), var(--bg-deep)); }
.assurance-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(2rem, 7vw, 6rem); align-items: start; margin-top: 4rem; }
.offer-card { padding: clamp(1.6rem, 4vw, 2.6rem); border: 1px solid #9cafbd; border-radius: .8rem; background: var(--panel); box-shadow: var(--shadow); }
.offer-label { color: var(--signal); font-family: var(--mono); font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.offer-card h3 { margin: .9rem 0 1.5rem; font-size: clamp(1.5rem, 3vw, 2.15rem); line-height: 1.15; }
.check-list { padding: 0; margin: 0; list-style: none; }
.check-list li { position: relative; padding: .85rem 0 .85rem 1.8rem; border-top: 1px solid var(--line); color: var(--muted); }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.process { margin: 0; padding: 0; list-style: none; }
.process-step { display: grid; grid-template-columns: 2.5rem 1fr; gap: 1rem; padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
.process-step > span { display: grid; place-items: center; width: 2.1rem; height: 2.1rem; border: 1px solid #7891a3; border-radius: 50%; color: var(--accent); font-family: var(--mono); font-size: .8rem; }
.process-step h3 { margin: .2rem 0 .4rem; font-size: 1.15rem; }
.process-step p { margin: 0; color: var(--muted); }
.process-summary { align-self: center; margin: 0; padding: 1.5rem 0; border-block: 1px solid var(--line); color: var(--muted); font-size: 1.05rem; }
.boundaries-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(3rem, 9vw, 8rem); align-items: start; }
.exclusion-card { border-left: 2px solid var(--signal-vivid); padding: .2rem 0 .2rem 2rem; }
.exclusion-card h3 { margin: 0 0 1rem; color: var(--signal); font-family: var(--mono); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }
.exclusion-card ul { margin: 0; padding-left: 1.2rem; }
.exclusion-card li { margin: .8rem 0; color: var(--muted); }
.principles { padding-block: clamp(5rem, 10vw, 8rem); border-block: 1px solid var(--line); background: var(--bg-deep); }
.principles h2 { max-width: 19ch; }
.principle-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 3rem; }
.principle-row p { margin: 0; color: var(--muted); }
.principle-row strong { display: block; margin-bottom: .35rem; color: var(--ink); }
.closing { padding-block: clamp(6rem, 12vw, 10rem); text-align: center; }
.closing h2 { max-width: 19ch; margin-inline: auto; }
.closing > p:not(.section-kicker) { max-width: 42rem; margin: 1.5rem auto 2rem; color: var(--muted); font-size: 1.08rem; }
footer { border-top: 1px solid var(--line); padding-block: 3rem; background: var(--bg-deep); }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: start; }
.footer-brand { margin-bottom: 1rem; }
.footer-inner p { max-width: 28rem; margin: 0; color: var(--faint); font-size: .88rem; }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { display: inline-flex; align-items: center; min-height: 2.75rem; color: var(--muted); font-size: .9rem; }
.copyright { grid-column: 1 / -1; padding-top: 2rem; border-top: 1px solid var(--line); }
@media (max-width: 820px) {
  .nav-shell { min-height: 4rem; }
  .brand-mark, .brand-mark-color, .brand-mark-forced { width: 1.875rem; height: 1.875rem; }
  .brand-mark { flex-basis: 1.875rem; }
  nav a:not(.nav-cta) { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 2.5rem; padding-block: 4.5rem; }
  .terminal-card { max-width: 35rem; transform: none; }
  .split, .assurance-layout, .boundaries-grid { grid-template-columns: 1fr; }
  .capability-grid, .principle-row { grid-template-columns: 1fr; }
  .capability-grid article { min-height: 0; padding: 1.25rem; }
  .capability-grid h3 { margin-top: 1.25rem; }
}
@media (max-width: 520px) {
  .shell { width: min(calc(100% - 1.5rem), var(--shell)); }
  .brand-wordmark { font-size: .875rem; }
  .nav-cta { padding: .52rem .7rem; font-size: .78rem; }
  h1 { max-width: 18ch; font-size: clamp(2.25rem, 10.8vw, 2.625rem); line-height: 1; letter-spacing: -.042em; }
  .hero { gap: 2rem; padding-block: 3.75rem; }
  .eyebrow { margin-bottom: .9rem; }
  .hero-product-name { margin-bottom: .45rem; }
  .lede { margin-top: 1.35rem; }
  .hero-actions { margin-top: 1.35rem; }
  .disclosure { margin-top: .9rem; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .problem-band { padding-block: 3.25rem; }
  .section { padding-block: 3.75rem; }
  .capability-grid { margin-top: 3rem; }
  .assurance-layout { margin-top: 2.5rem; }
  .principles { padding-block: 3.75rem; }
  .principles h2 { font-size: 1.9rem; line-height: 1.12; }
  .closing { padding-block: 4rem; }
  .terminal-facts div { display: block; }
  .terminal-facts dd { display: block; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
  .copyright { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}
@media (forced-colors: active) {
  .status-dot { forced-color-adjust: none; }
  .brand-mark-color { display: none; }
  .brand-mark-forced { display: block; forced-color-adjust: none; }
  .button, .nav-cta, .terminal-card, .offer-card { border: 1px solid ButtonText; }
  .terminal-card { background: Canvas; box-shadow: none; }
  .terminal-card * { color: CanvasText !important; }
}