/* Layout: one reading column on a faint engineering grid; the build steps run as a ruled strip across the page. */
:root {
  color-scheme: light;
  --paper: #f3f6f7;
  --panel: #ffffff;
  --ink: #0f1d2b;
  --ink-soft: #4a5a6b;
  --rule: #d6dee4;
  --grid: rgba(15, 29, 43, 0.045);
  --go: #0b7a6f;          /* "launch" signal: a confident teal-green */
  --go-soft: #dff1ee;
  --marker: #b45309;      /* step numbers, sparingly */
  --display: "Archivo", "Arial Narrow", system-ui, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #0d151d; --panel: #13202b; --ink: #e6edf2; --ink-soft: #9fb0bf; --rule: #24354a;
    --grid: rgba(230, 237, 242, 0.04); --go: #4fd1c0; --go-soft: #10302d; --marker: #f0a35a;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0d151d; --panel: #13202b; --ink: #e6edf2; --ink-soft: #9fb0bf; --rule: #24354a;
  --grid: rgba(230, 237, 242, 0.04); --go: #4fd1c0; --go-soft: #10302d; --marker: #f0a35a;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font: 17px/1.65 var(--body);
}
a { color: var(--go); }
a:focus-visible, .skip:focus { outline: 3px solid var(--marker); outline-offset: 3px; border-radius: 3px; }
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding-inline: 20px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); color: var(--ink); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 12px; }

/* Header */
.top { border-bottom: 1px solid var(--rule); background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(6px);
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; }
.top-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 14px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 800 20px/1 var(--display); color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.mark { width: 22px; height: 22px; border-radius: 4px; background:
  linear-gradient(var(--go), var(--go)) 0 0 / 10px 10px no-repeat,
  linear-gradient(var(--ink), var(--ink)) 12px 0 / 10px 10px no-repeat,
  linear-gradient(var(--ink), var(--ink)) 0 12px / 10px 10px no-repeat,
  linear-gradient(var(--ink), var(--ink)) 12px 12px / 10px 10px no-repeat; }
nav { display: flex; gap: 20px; flex-wrap: wrap; }
nav a { color: var(--ink-soft); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--ink); }

/* Hero */
.hero { padding-block: 72px 48px; display: grid; gap: 18px; }
.eyebrow, .tag, .k { font: 500 12px/1.3 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--go); margin: 0; }
h1 { margin: 0; max-width: 18ch; font: 800 clamp(36px, 6vw, 64px)/1.02 var(--display); letter-spacing: -0.02em; text-wrap: balance; }
h2 { margin: 0 0 14px; font: 800 clamp(26px, 3.4vw, 36px)/1.1 var(--display); letter-spacing: -0.01em; text-wrap: balance; }
h3 { margin: 6px 0 10px; font: 600 21px/1.3 var(--display); }
.lede { margin: 0; max-width: 62ch; font-size: 19px; color: var(--ink-soft); }
.status { margin: 6px 0 0; display: inline-flex; align-items: center; gap: 8px; font: 500 14px/1 var(--mono); color: var(--ink-soft); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--go); box-shadow: 0 0 0 4px var(--go-soft); }

/* Steps strip */
.grid-band { border-block: 1px solid var(--rule); background: var(--panel); }
.steps { list-style: none; margin: 0 auto; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); padding-block: 0; }
.steps li { display: grid; gap: 4px; padding: 22px 18px; border-left: 1px solid var(--rule); align-content: start; }
.steps li:first-child { border-left: 0; padding-left: 0; }
.steps .n { font: 500 13px/1 var(--mono); color: var(--marker); }
.steps strong { font: 600 18px/1.2 var(--display); }
.steps span:last-child { color: var(--ink-soft); font-size: 15px; line-height: 1.45; }

section { scroll-margin-top: 80px; }
.two-engines, .quality, .facts, .contact { padding-block: 64px 0; }
.engines { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.engine { background: var(--panel); border: 1px solid var(--rule); border-radius: 8px; padding: 24px; }
.engine p { margin: 0 0 12px; color: var(--ink-soft); }
.engine p.tag { color: var(--go); }
.engine p:last-child { margin-bottom: 0; }
.intro { margin: 0 0 22px; max-width: 64ch; color: var(--ink-soft); }

.gates { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border-top: 1px solid var(--rule); }
.gates li { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--rule); color: var(--ink-soft); }
.gates .g { font: 600 16px/1.5 var(--display); color: var(--ink); }

.fact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 40px; }
.fact p { margin: 0; color: var(--ink-soft); }
.fact .k { margin-bottom: 8px; }

.contact { padding-bottom: 80px; }
.contact p { margin: 0 0 10px; max-width: 62ch; color: var(--ink-soft); }
.mail a { font: 600 clamp(20px, 3vw, 26px)/1.3 var(--display); text-decoration-thickness: 2px; text-underline-offset: 5px; word-break: break-word; }
.muted { font-size: 15px; }

.foot { border-top: 1px solid var(--rule); background: var(--panel); }
.foot-row { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-block: 22px;
  padding-bottom: calc(22px + env(safe-area-inset-bottom, 0px)); font-size: 14px; color: var(--ink-soft); }
.foot-row p { margin: 0; }

/* Privacy page */
.doc { padding-block: 56px 80px; max-width: 760px; }
.doc h1 { font-size: clamp(32px, 5vw, 48px); margin-bottom: 8px; }
.doc h2 { font-size: 22px; margin-top: 32px; }
.doc p, .doc li { color: var(--ink-soft); max-width: 66ch; }

@media (max-width: 820px) {
  .steps { grid-template-columns: 1fr; }
  .steps li { border-left: 0; border-top: 1px solid var(--rule); padding: 16px 0; grid-template-columns: 36px 1fr; column-gap: 12px; }
  .steps li:first-child { border-top: 0; }
  .steps .n { grid-row: span 2; padding-top: 3px; }
  .engines, .fact-grid { grid-template-columns: 1fr; }
  .gates li { grid-template-columns: 1fr; gap: 2px; }
  .hero { padding-block: 48px 36px; }
}