/* ZillA Technologies site.
   Layout concept: an engineering datasheet. Cool paper ground, deep ink text, rules instead of cards,
   cobalt reserved for the xZane runtime, amber reserved for a device's own safety.
   Display type is a condensed machine-label face; mono carries labels, protocols and schema. */
:root {
  --bg: #F2F4F5;
  --surface: #FFFFFF;
  --sunken: #E7EBEE;
  --ink: #0F1A22;
  --ink-2: #40505C;
  --ink-3: #5A6772;
  --rule: #CBD3D9;
  --rule-strong: #98A5AF;
  --accent: #1B55C9;
  --accent-ink: #FFFFFF;
  --safety: #B26A00;
  --safety-soft: #FFF0CC;
  --safety-ink: #5E3A00;
  --bad: #B3261E;

  --font-display: "Barlow Condensed", "Arial Narrow", Arial, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  color-scheme: light;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0D1317;
    --surface: #141C22;
    --sunken: #10181D;
    --ink: #E8EEF2;
    --ink-2: #B3C0CA;
    --ink-3: #8A98A3;
    --rule: #26323B;
    --rule-strong: #3E4D58;
    --accent: #7AA7FF;
    --accent-ink: #0A1220;
    --safety: #FFB52E;
    --safety-soft: #2B2108;
    --safety-ink: #FFD27A;
    --bad: #FF8A80;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0D1317;
  --surface: #141C22;
  --sunken: #10181D;
  --ink: #E8EEF2;
  --ink-2: #B3C0CA;
  --ink-3: #8A98A3;
  --rule: #26323B;
  --rule-strong: #3E4D58;
  --accent: #7AA7FF;
  --accent-ink: #0A1220;
  --safety: #FFB52E;
  --safety-soft: #2B2108;
  --safety-ink: #FFD27A;
  --bad: #FF8A80;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--font-body);
  -webkit-text-size-adjust: 100%;
}
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
p { margin: 0 0 1em; }
ul { margin: 0 0 1em; padding-left: 1.2em; }
li { margin-block: 0.35em; }
strong { font-weight: 600; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.005em;
  text-wrap: balance;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.9rem, 6.4vw, 4.9rem); line-height: 0.94; font-weight: 700; }
h2 { font-size: clamp(2rem, 4.2vw, 3rem); line-height: 1; }
h3 { font-size: 1.55rem; line-height: 1.1; }

.wrap {
  max-width: 1120px;
  margin-inline: auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.band { padding-block: clamp(44px, 7vw, 84px); }
.band.alt { background: var(--sunken); border-block: 1px solid var(--rule); }
.prose p { max-width: 62ch; }
.lede { font-size: 1.18rem; color: var(--ink-2); max-width: 56ch; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font: 500 0.75rem/1.2 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.eyebrow::before { content: ""; width: 9px; height: 9px; background: var(--accent); flex: none; }

/* Header */
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: var(--bg); border-bottom: 1px solid var(--rule);
}
/* Paints the phone's status-bar inset so content never shows above the sticky header. */
body::before {
  content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px);
  background: var(--bg); z-index: 21;
}
html { scroll-padding-top: 92px; }
@media (max-width: 720px) {
  .site-header nav { width: 100%; }
  .site-header nav ul { flex-wrap: nowrap; overflow-x: auto; gap: 4px 18px; padding-bottom: 2px; -webkit-overflow-scrolling: touch; }
  .site-header nav li { flex: none; }
  html { scroll-padding-top: 112px; }
}
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 10px 28px; padding-block: 14px;
}
.brand {
  font-family: var(--font-display); font-weight: 700; font-size: 1.7rem; line-height: 1;
  color: var(--ink); text-decoration: none; display: inline-flex; gap: 0.35em; align-items: baseline;
}
.brand-x { color: var(--accent); }
.site-header nav ul { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 22px; list-style: none; margin: 0; padding: 0; }
.site-header nav li { margin: 0; }
.site-header nav a:not(.btn) {
  color: var(--ink); text-decoration: none; font-size: 0.95rem; padding-block: 8px; display: inline-block;
  border-bottom: 2px solid transparent;
}
.site-header nav a:not(.btn):hover { border-bottom-color: var(--rule-strong); }
.site-header nav a[aria-current="page"] { border-bottom-color: var(--accent); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 22px;
  background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent); border-radius: 3px;
  font: 600 0.98rem/1 var(--font-body); text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn-ghost:hover { border-color: var(--ink); filter: none; }
.btn-small { min-height: 38px; padding: 0 14px; font-size: 0.9rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* Hero */
.hero { padding-block: clamp(36px, 6vw, 76px) clamp(36px, 5vw, 60px); }
.hero-grid {
  display: grid; gap: 36px 56px; align-items: start;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
}
.hero-grid > * { min-width: 0; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: minmax(0, 1fr); } }

/* Fact strip */
.facts-band { border-block: 1px solid var(--rule-strong); }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); margin: 0; }
.facts > div { padding: 20px 24px 20px 0; min-width: 0; }
.facts dt { font: 500 0.75rem/1.2 var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
.facts dd { margin: 0; color: var(--ink-2); font-size: 0.98rem; }

/* Columns */
.cols { display: grid; gap: 32px 40px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin-top: 32px; }
.cols.two { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.col { border-top: 2px solid var(--ink); padding-top: 14px; min-width: 0; }
.col.safety { border-top-color: var(--safety); }
.col p:last-child { margin-bottom: 0; }
.col p { color: var(--ink-2); }

/* Vertical cards */
.vgrid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); margin-top: 28px; }
.vcard {
  display: flex; flex-direction: column; gap: 6px; padding: 26px; min-width: 0;
  background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; color: var(--ink); text-decoration: none;
}
.vcard:hover { border-color: var(--accent); }
.vcard p { color: var(--ink-2); }
.vcard .go { margin-top: auto; font: 500 0.88rem var(--font-mono); color: var(--accent); }
.aside { margin-top: 24px; color: var(--ink-2); }

/* Code cards */
.code-card { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; min-width: 0; }
.code-head {
  display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 16px;
  border-bottom: 1px solid var(--rule); font: 500 0.72rem/1.2 var(--font-mono); letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-3);
}
.pill { padding: 3px 9px; border: 1px solid currentColor; border-radius: 99px; font: 500 0.7rem/1.2 var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; }
.pill-bad { color: var(--bad); }
.pill-safety { color: var(--safety-ink); background: var(--safety-soft); border-color: var(--safety); }
.code-card pre { margin: 0; padding: 16px; overflow-x: auto; font: 400 0.82rem/1.65 var(--font-mono); color: var(--ink); }
.code-card .c { color: var(--ink-3); }
.code-card .k-bad { color: var(--bad); }
.code-card .k-safety { color: var(--safety-ink); }
figure { margin: 0; }
.cap { font-size: 0.92rem; color: var(--ink-2); margin: 12px 0 0; max-width: 60ch; }
.pair { display: grid; gap: 28px; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); margin-top: 28px; }
.pair > * { min-width: 0; }
.links { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 28px 0 0; font-family: var(--font-mono); font-size: 0.9rem; }
.links li { margin: 0; }

/* Notes and panels */
.note { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 16px 20px; color: var(--ink-2); max-width: 70ch; margin-top: 28px; }
.note strong { color: var(--ink); }
.note.safety { background: var(--safety-soft); border-color: var(--safety); color: var(--safety-ink); }
.note.safety strong { color: var(--safety-ink); }
.panel { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 24px; min-width: 0; }
.panel h3 { margin-bottom: 0.4em; }
.panel ul { margin-bottom: 0; }

/* Use cases */
.cases { display: grid; gap: 28px 36px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin-top: 32px; }
.case { border-top: 1px solid var(--rule-strong); padding-top: 14px; min-width: 0; }
.case h3 { font-size: 1.35rem; }
.case p { color: var(--ink-2); margin-bottom: 0; }

/* Stats */
.stats { display: grid; gap: 24px 36px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 32px 0 8px; }
.stat { border-top: 2px solid var(--ink); padding-top: 12px; min-width: 0; }
.stat .num { font: 700 3.2rem/1 var(--font-display); }
.stat .lab { color: var(--ink-2); font-size: 0.95rem; margin-top: 6px; }
.stat sup a { font-size: 0.75rem; }

/* Pilot */
.tiers { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); margin-top: 28px; }
.tier { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 26px; min-width: 0; }
.tier .name { font: 500 0.75rem/1.2 var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 10px; }
.tier .price { font: 700 3.4rem/1 var(--font-display); margin: 0 0 6px; }
.tier .scope { color: var(--ink-2); margin-bottom: 16px; }
.tier ul { color: var(--ink-2); margin-bottom: 0; }

/* Contact */
.contact-grid { display: grid; gap: 36px 56px; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); align-items: start; }
.contact-grid > * { min-width: 0; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: minmax(0, 1fr); } }
.addr-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 22px; }
.addr { font: 500 0.98rem var(--font-mono); overflow-wrap: anywhere; user-select: all; }

/* Sources and footer */
.sources { font-size: 0.86rem; color: var(--ink-2); margin-top: 28px; max-width: 80ch; }
.sources ol { padding-left: 1.3em; margin: 8px 0 0; }
.site-footer { border-top: 1px solid var(--rule-strong); padding-block: 28px 36px; color: var(--ink-2); font-size: 0.92rem; }
.site-footer p { margin: 0 0 6px; }
.site-footer .fine { color: var(--ink-3); font-size: 0.82rem; max-width: 80ch; }

/* Diagram */
.dg-block { margin-top: 28px; }
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.tab {
  min-height: 42px; padding: 0 16px; border: 1px solid var(--rule-strong); background: transparent; color: var(--ink);
  font: 500 0.85rem/1 var(--font-mono); border-radius: 3px; cursor: pointer;
}
.tab:hover { border-color: var(--ink); }
.tab[aria-selected="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.dg-fig { margin: 0; }
.dg-stage { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 14px; overflow-x: auto; min-height: 220px; }
.dg { display: block; width: 100%; height: auto; color: var(--ink); }
.dg-narrow .dg { max-width: 520px; margin-inline: auto; }
.dg-node { fill: var(--surface); stroke: var(--rule-strong); stroke-width: 1.3; }
.dg-xz { fill: var(--sunken); stroke: var(--accent); stroke-width: 1.6; }
.dg-stage-box, .dg-stg { fill: var(--surface); stroke: var(--rule-strong); stroke-width: 1.2; }
.dg-gate { fill: var(--safety-soft); stroke: var(--safety); stroke-width: 1.7; }
.dg-safe { fill: var(--safety-soft); stroke: var(--safety); stroke-width: 1.4; }
.dg-line { stroke: var(--ink-2); stroke-width: 1.4; fill: none; }
.dg-amber { stroke: var(--safety); stroke-width: 1.7; fill: none; }
.dash { stroke-dasharray: 5 4; }
.dg-t { fill: var(--ink); font: 500 12.5px var(--font-body); }
.dg-s { fill: var(--ink-3); font: 400 10.5px var(--font-mono); }
.dg-h { fill: var(--ink-3); font: 500 11px var(--font-mono); letter-spacing: 0.06em; }
.dg-p { fill: var(--ink-2); font: 500 11px var(--font-mono); }
.dg-ta { fill: var(--safety-ink); font: 500 12px var(--font-body); }
.dg-tas { fill: var(--safety-ink); font: 400 10.5px var(--font-mono); }
.dg-amber-t { fill: var(--safety-ink); font: 500 11px var(--font-mono); }
.mk { fill: var(--ink-2); }
.mk-s { fill: var(--safety); }
.dg-fig figcaption { margin-top: 14px; color: var(--ink-2); font-size: 0.95rem; max-width: 74ch; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }