/* Relionaut — actranio.com
   Design language derived from tetral.ai: warm paper/ink dual palette,
   4px radius, light-weight display type, tracked section labels,
   hairline editorial grids, dark code windows. */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #f9f9f6;
  --ink: #17190f;
  --muted: #55534c;
  --faint: #6b6a5f;
  --border: rgba(23, 25, 15, .16);
  --border-soft: rgba(23, 25, 15, .09);
  --panel: rgba(23, 25, 15, .028);
  --link: #17190f;
  --code-bg: #101109;
  --code-ink: #e8e6dc;
  --code-border: #2e2f26;
  --code-muted: #8f8e80;
  --code-accent: #c8a878;
  --code-blue: #9db8d4;
  --green-border: #3a4a40; --green-ink: #2f4a3c;
  --amber-border: #4a4030; --amber-ink: #6b5424;
  --blue-border:  #33404e; --blue-ink:  #33506e;
  --sans: "Geist", -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --display: "Schibsted Grotesk", "Geist", -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121310;
    --ink: #e8e6dc;
    --muted: #a3a295;
    --faint: #8f8e80;
    --border: rgba(232, 230, 220, .18);
    --border-soft: rgba(232, 230, 220, .10);
    --panel: rgba(232, 230, 220, .035);
    --link: #e8e6dc;
    --green-border: #3a4a40; --green-ink: #9dc3ad;
    --amber-border: #4a4030; --amber-ink: #d4b878;
    --blue-border:  #33404e; --blue-ink:  #9db8d4;
  }
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--sans); background: var(--bg); color: var(--ink);
  font-size: 15.5px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 24px; }
a { color: var(--link); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--border); }
a:hover { text-decoration-color: var(--ink); }
code, pre { font-family: var(--mono); font-size: .84em; }
code.inline { background: var(--panel); border: 1px solid var(--border-soft); border-radius: 4px; padding: 1px 6px; color: var(--ink); white-space: nowrap; }

/* ---------- nav ---------- */
nav { border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; background: var(--bg); }
nav .wrap { display: flex; align-items: center; gap: 26px; height: 58px; }
nav .brand { font-family: var(--display); font-weight: 600; font-size: 1rem; text-decoration: none; letter-spacing: -.01em; display: flex; align-items: center; }
nav .brand svg.mark { margin-right: 8px; flex: none; }
nav .links { display: flex; gap: 20px; margin-left: auto; align-items: center; }
nav .links a { color: var(--muted); font-size: 12.5px; text-decoration: none; letter-spacing: .04em; text-transform: uppercase; padding: 8px 0; }
nav .links a:hover { color: var(--ink); }
nav .links a.gh { border: 1px solid var(--border); border-radius: 4px; padding: 5px 12px; color: var(--ink); }
nav .links a.gh:hover { background: var(--panel); }

/* ---------- hero with corner ticks ---------- */
.hero { position: relative; padding: 88px 0 64px; border-bottom: 1px solid var(--border); }
.hero .tick { position: absolute; width: 14px; height: 14px; }
.hero .tick.bl { left: 24px; bottom: 18px; border-left: 1px solid var(--faint); border-bottom: 1px solid var(--faint); }
.hero .tick.br { right: 24px; bottom: 18px; border-right: 1px solid var(--faint); border-bottom: 1px solid var(--faint); }
.hero h1 {
  font-family: var(--display); font-weight: 500; letter-spacing: -.02em;
  font-size: clamp(42px, 6.5vw, 58px); line-height: 1.16; max-width: 21ch;
}
.hero h1 em { font-style: normal; border-bottom: 3px solid var(--code-accent); }
.hero p.sub { color: var(--muted); font-size: 16.5px; max-width: 58ch; margin-top: 20px; }
.cta { display: flex; gap: 10px; margin-top: 30px; flex-wrap: wrap; }
.cta a { border-radius: 4px; padding: 10px 18px; font-size: 14px; font-weight: 500; text-decoration: none; }
.cta a.primary { background: var(--ink); color: var(--bg); }
.cta a.primary:hover { opacity: .85; }
.cta a.ghost { border: 1px solid var(--border); color: var(--ink); }
.cta a.ghost:hover { background: var(--panel); }

/* badges: tinted hairline pills (tetral style) */
.badges { display: flex; gap: 8px; margin-top: 26px; flex-wrap: wrap; }
.badge {
  font-family: var(--mono); font-size: 11px; letter-spacing: .02em;
  border: 1px solid var(--border); border-radius: 4px; padding: 3px 9px; color: var(--muted);
}
.badge.green { border-color: var(--green-border); color: var(--green-ink); }
.badge.amber { border-color: var(--amber-border); color: var(--amber-ink); }
.badge.blue  { border-color: var(--blue-border);  color: var(--blue-ink); }

/* ---------- sections ---------- */
section { padding: 64px 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }
.section-label {
  font-size: 11.5px; font-weight: 500; letter-spacing: .14em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 14px;
}
section h2 { font-family: var(--display); font-weight: 500; letter-spacing: -.015em; font-size: clamp(24px, 3.4vw, 30px); line-height: 1.2; margin-bottom: 10px; }
section p.lead { color: var(--muted); max-width: 62ch; margin-bottom: 30px; font-size: 15.5px; }

/* hairline editorial grid */
.grid { display: grid; border: 1px solid var(--border); border-radius: 4px; overflow: hidden; background: var(--border); gap: 1px; }
.grid.cols3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.grid.cols2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr)); }
.cell { background: var(--bg); padding: 22px 20px; }
.cell h3 { font-family: var(--display); font-weight: 600; font-size: .98rem; margin-bottom: 7px; letter-spacing: -.01em; }
.cell p { color: var(--muted); font-size: .9rem; line-height: 1.6; }
.cell .ico { font-size: 1.15rem; display: block; margin-bottom: 10px; }

/* code windows */
pre {
  background: var(--code-bg); color: var(--code-ink); border: 1px solid var(--code-border);
  border-radius: 4px; padding: 16px 18px; overflow-x: auto; line-height: 1.6; font-size: .82rem;
}
pre .c { color: var(--code-muted); }
pre .k { color: var(--code-blue); }
pre .s { color: var(--code-accent); }

/* kernel/host duo */
.duo { display: grid; gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); }
.duo .half { background: var(--bg); padding: 24px 22px; }
.duo .half h3 { font-family: var(--mono); font-size: .9rem; font-weight: 500; margin-bottom: 4px; }
.duo .half.core h3 { color: var(--green-ink); }
.duo .half.host h3 { color: var(--blue-ink); }
.duo .half p { color: var(--muted); font-size: .9rem; }
.portlist { list-style: none; margin-top: 14px; display: grid; gap: 8px; }
.portlist li { display: flex; gap: 10px; align-items: baseline; font-size: .88rem; border-top: 1px solid var(--border-soft); padding-top: 8px; }
.portlist code { color: var(--ink); font-weight: 500; white-space: nowrap; font-size: .8rem; }
.portlist span.d { color: var(--muted); font-size: .84rem; }

/* tables */
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
th { color: var(--faint); font-weight: 500; font-size: 11.5px; letter-spacing: .09em; text-transform: uppercase; white-space: nowrap; }
td code { color: var(--ink); font-size: .8rem; }

/* autonomy spectrum */
.spectrum { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; margin-top: 26px; }
.spectrum .lvl { background: var(--bg); padding: 16px 14px; font-size: .86rem; color: var(--muted); }
.spectrum .lvl b { display: block; font-size: 11px; letter-spacing: .09em; text-transform: uppercase; color: var(--faint); margin-bottom: 6px; font-weight: 500; }
.spectrum .lvl.here { background: var(--panel); }
.spectrum .lvl.here b { color: var(--green-ink); }
.spectrum .lvl.here { outline: 1px solid var(--green-border); outline-offset: -1px; }

/* subpage header */
.pagehead { padding: 64px 0 40px; border-bottom: 1px solid var(--border); }
.pagehead h1 { font-family: var(--display); font-weight: 500; letter-spacing: -.02em; font-size: clamp(34px, 5vw, 46px); line-height: 1.18; }
.pagehead p { color: var(--muted); max-width: 62ch; margin-top: 12px; font-size: 15.5px; }

/* numbered steps */
.steps { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; border-top: 1px solid var(--border); }
.step { display: flex; gap: 18px; padding: 26px 0; border-bottom: 1px solid var(--border); }
.step .n {
  flex: none; font-family: var(--mono); font-size: .8rem; color: var(--faint);
  border: 1px solid var(--border); border-radius: 4px; width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center; margin-top: 2px;
}
.step .body { flex: 1; min-width: 0; }
.step .body h3 { font-family: var(--display); font-weight: 600; font-size: 1.05rem; letter-spacing: -.01em; }
.step .body p { color: var(--muted); font-size: .92rem; margin: 6px 0 12px; max-width: 68ch; }

/* footer */
footer { border-top: 1px solid var(--border); padding: 30px 0 44px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; color: var(--faint); font-size: .82rem; }
footer .wrap a { color: var(--muted); }
footer .wrap svg.mark { vertical-align: -4px; }
footer .wrap .sep { margin-left: auto; }
@media (max-width: 720px) { footer .wrap .sep { margin-left: 0; } }


/* ---------- tables: horizontal scroll on small screens ---------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-wrap table { min-width: 560px; }

/* ---------- mobile ---------- */
@media (max-width: 640px) {
  nav .wrap { gap: 14px; height: 54px; }
  nav .brand { font-size: .95rem; }
  nav .brand svg.mark { width: 18px; height: 18px; margin-right: 6px; }
  nav .links { gap: 12px; }
  nav .links a { font-size: 11px; letter-spacing: .02em; }
  nav .links a.gh { padding: 4px 9px; }

  .hero { padding: 56px 0 44px; }
  .hero h1 { font-size: clamp(30px, 8.6vw, 38px); }
  .hero p.sub { font-size: 15px; margin-top: 14px; }
  .hero .tick { display: none; }
  .cta a { padding: 9px 15px; font-size: 13.5px; }
  .badge { font-size: 10.5px; }

  section { padding: 44px 0; }
  section h2 { font-size: clamp(21px, 6vw, 25px); }
  section p.lead { font-size: 14.5px; }

  .pagehead { padding: 44px 0 28px; }
  .pagehead h1 { font-size: clamp(28px, 7.6vw, 34px); }

  .cell { padding: 16px 14px; }
  .duo .half { padding: 18px 16px; }
  .portlist li { gap: 8px; }

  pre { font-size: .78rem; padding: 13px 14px; }

  .step { gap: 12px; padding: 20px 0; }
  .step .n { width: 28px; height: 28px; font-size: .7rem; }
  .step .body h3 { font-size: .98rem; }
  .step .body p { font-size: .88rem; }

  .spectrum .lvl { padding: 12px; font-size: .8rem; }
}