/* Colours and type follow humanbehaviour.ai (vol.01 tokens), so the two sites read as one firm. */
:root {
  --abyss: #050913;
  --deep: #0B1226;
  --tide: #14213D;
  --horizon: #2D3854;
  --ascent: #6E7B9C;
  --mist: #BDC4D2;
  --aurora-deep: #B47820;
  --aurora: #E8A23B;
  --aurora-glow: #FFD37A;
  --chalk: #ECE3CB;
  --paper: #F5EFE2;
  --paper-deep: #EBE3D0;
  --ink: #1A1A1A;
  --ink-soft: #4A4A4A;
  --ink-faint: #7A7468;
  --oxblood: #A0381A;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter Tight", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, Menlo, monospace;

  --measure: 68ch;
  --gutter: clamp(16px, 5vw, 72px);
  --radius: 1px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
strong, b { font-weight: inherit; } /* hbai voice: no bold; emphasis is italic + aurora */
em { font-style: italic; color: var(--oxblood); }
.deep em { color: var(--aurora); }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--aurora); color: var(--abyss); padding: 8px 12px; z-index: 10; }
:focus-visible { outline: 2px solid var(--aurora); outline-offset: 3px; }

.staging {
  background: var(--oxblood); color: var(--paper);
  font: 500 12px/1.4 var(--mono); letter-spacing: .04em;
  text-align: center; padding: 6px 16px;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: var(--measure); }

/* Header: sticky, so the CTA is always one tap away */
html { scroll-behavior: smooth; scroll-padding-top: 128px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
.top { position: sticky; top: 0; z-index: 5; background: var(--deep); color: var(--chalk); border-bottom: 1px solid var(--horizon); }
.top .bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 14px; padding-bottom: 14px; }
.brand { font: 400 18px/1.2 var(--serif); text-decoration: none; }
.brand span { display: block; font: 400 11px/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ascent); margin-top: 2px; }
.nav { display: flex; gap: 24px; font-size: 14px; }
.nav a { text-decoration: none; color: var(--mist); white-space: nowrap; }
.nav a:hover { color: var(--aurora-glow); }
.top .btn { padding: 10px 16px; font-size: 14px; white-space: nowrap; }
.nav-row { display: none; }
@media (max-width: 860px) {
  .bar .nav { display: none; }
  .brand { font-size: 16px; }
  .nav-row { display: block; border-top: 1px solid var(--horizon); }
  .nav-row .nav { overflow-x: auto; padding: 10px var(--gutter); gap: 20px; scrollbar-width: none; }
  .nav-row .nav::-webkit-scrollbar { display: none; }
}
@media (max-width: 400px) { .top .btn { padding: 9px 12px; font-size: 13px; } .brand span { display: none; } }

/* Sections */
.deep { background: var(--deep); color: var(--chalk); }
.abyss { background: var(--abyss); color: var(--chalk); }
.warm { background: var(--paper-deep); }
section { padding: clamp(56px, 9vw, 104px) 0; }

.eyebrow { font: 400 12px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 16px; }
.deep .eyebrow, .abyss .eyebrow { color: var(--ascent); }

h1, h2, h3 { font-family: var(--serif); font-weight: 400; margin: 0; }
h1 { font-size: clamp(36px, 6.4vw, 72px); line-height: .98; letter-spacing: -.01em; max-width: 16ch; }
h2 { font-size: clamp(30px, 4.4vw, 46px); line-height: 1.05; max-width: 22ch; margin-bottom: 20px; }
h3 { font-size: 22px; line-height: 1.2; margin-bottom: 8px; }
p { margin: 0 0 16px; }
.lede { font: 400 clamp(19px, 2.2vw, 23px)/1.45 var(--serif); max-width: 40ch; color: var(--ink-soft); }
.deep .lede { color: var(--mist); }
.hero { padding-top: clamp(32px, 7vw, 88px); padding-bottom: clamp(48px, 8vw, 96px); }
.hero .lede { margin-top: 20px; }
.hero .ctas { margin-top: 28px; }

/* Buttons */
.ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.btn {
  display: inline-block; text-decoration: none; padding: 13px 20px; border-radius: var(--radius);
  font: 500 15px/1.2 var(--sans); border: 1px solid var(--aurora); background: var(--aurora); color: var(--abyss);
}
.btn:hover { background: var(--aurora-glow); border-color: var(--aurora-glow); }
.btn.ghost { background: transparent; color: inherit; border-color: currentColor; }
.btn.ghost:hover { color: var(--aurora-deep); }
.deep .btn.ghost:hover, .abyss .btn.ghost:hover { color: var(--aurora-glow); }

/* Grids */
.grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin-top: 32px; }
.card { border-top: 1px solid var(--ink-faint); padding-top: 18px; }
.deep .card, .abyss .card { border-color: var(--horizon); }
.card p { color: var(--ink-soft); margin: 0; }
.deep .card p, .abyss .card p { color: var(--mist); }
.num { font: 400 12px/1 var(--mono); color: var(--aurora-deep); letter-spacing: .08em; display: block; margin-bottom: 12px; }
.deep .num, .abyss .num { color: var(--aurora); }

/* SCAN board */
.scan { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1px; background: var(--horizon); border: 1px solid var(--horizon); margin-top: 32px; }
.scan div { background: var(--tide); padding: 24px; }
.scan .letter { font: 400 48px/1 var(--serif); color: var(--aurora); }
.scan h3 { margin-top: 12px; color: var(--chalk); }
.scan .how { font: 400 12px/1.4 var(--mono); color: var(--ascent); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 12px; }
.scan p { color: var(--mist); margin: 0; font-size: 15px; }

/* Steps (guide) */
.steps { list-style: none; padding: 0; margin: 32px 0 0; counter-reset: s; }
.steps > li { counter-increment: s; border-top: 1px solid var(--paper-deep); padding: 28px 0 12px; display: grid; grid-template-columns: 64px 1fr; gap: 8px 16px; }
.steps > li::before { content: counter(s, decimal-leading-zero); font: 400 13px/1.8 var(--mono); color: var(--aurora-deep); }
.steps > li > * { grid-column: 2; }
.steps ul { margin: 0 0 12px; padding-left: 20px; color: var(--ink-soft); }
@media (max-width: 560px) { .steps > li { grid-template-columns: 1fr; } .steps > li > * { grid-column: 1; } }

/* Example */
.example { display: grid; gap: 0; margin-top: 32px; }
.example div { border-left: 1px solid var(--aurora-deep); padding: 0 0 28px 24px; }
.example div:last-child { padding-bottom: 0; }

/* Quote */
blockquote { margin: 40px 0 0; font: italic 400 clamp(24px, 3.2vw, 34px)/1.25 var(--serif); max-width: 30ch; color: var(--chalk); }
blockquote footer { font: 400 13px/1.5 var(--mono); font-style: normal; color: var(--ascent); margin-top: 16px; }

/* Table */
.table-wrap { overflow-x: auto; margin-top: 28px; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 14px 12px; border-bottom: 1px solid var(--paper-deep); }
th { font: 400 12px/1.4 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-faint); }
td:first-child { font-family: var(--serif); font-size: 18px; }

/* FAQ */
details { border-top: 1px solid var(--ink-faint); padding: 18px 0; }
details:last-of-type { border-bottom: 1px solid var(--ink-faint); }
summary { cursor: pointer; font: 400 20px/1.3 var(--serif); list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-family: var(--mono); color: var(--aurora-deep); }
details[open] summary::after { content: "–"; }
details p { margin: 12px 0 0; color: var(--ink-soft); max-width: var(--measure); }

/* Article body */
.prose { max-width: var(--measure); }
.prose h2 { margin-top: 56px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.note { border-left: 2px solid var(--aurora-deep); padding: 4px 0 4px 18px; color: var(--ink-soft); margin: 28px 0; }

/* Footer */
.foot { background: var(--abyss); color: var(--mist); font-size: 14px; padding: 64px 0 32px; }
.foot .cols { display: grid; gap: 32px; grid-template-columns: 2fr 1fr 1fr; }
@media (max-width: 760px) { .foot .cols { grid-template-columns: 1fr 1fr; } .foot .about { grid-column: 1 / -1; } }
.foot h4 { font: 400 11px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ascent); margin: 0 0 14px; font-weight: 400; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: 10px; }
.foot a { color: var(--chalk); text-decoration: none; }
.foot a:hover { color: var(--aurora-glow); }
.foot .btn, .foot .btn:hover { color: var(--abyss); }
.foot .about p { margin: 0 0 12px; max-width: 36ch; }
.foot .about .brand { color: var(--chalk); display: inline-block; margin-bottom: 14px; }
.foot .legal { border-top: 1px solid var(--horizon); margin-top: 48px; padding-top: 20px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--ascent); }