/* ============================================================
   Zen AI · Design System
   White, one typeface, lines instead of surfaces.
   Colour is used sparingly: one accent (Flieder) for emphasis,
   one warm tone for "open / pending", a short chart palette.
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root {
  /* ground */
  --bg: #fcfcfc;
  --ink: #000000;
  --muted: #6b6b6b;
  --line: #e4e4e4;
  --soft: #f4f4f6;

  /* accent · Flieder */
  --accent: #6C5CE7;
  --accent-dark: #5546D6;
  --accent-ink: #4B3FBF;
  --accent-soft: #E9E7FB;
  --accent-mist: #ECEDF7;
  --accent-08: rgba(108, 92, 231, .08);
  --accent-12: rgba(108, 92, 231, .16);

  /* warm · open, pending, caution */
  --warm: #F5A64B;
  --warm-dark: #D9822B;
  --warm-08: rgba(245, 166, 75, .14);

  /* chart palette (in order of use) */
  --c1: #6C5CE7;
  --c2: #2F80ED;
  --c3: #E8734A;
  --c4: #19A88A;
  --c5: #C33F8F;
  --c6: #8E5BE0;

  /* type */
  --font: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* layout */
  --col: 880px;
  --gutter: clamp(40px, 12vw, 200px);
  --radius: 6px;

  /* compatibility aliases for imported article graphics */
  --pine: var(--accent);
  --pine-dark: var(--accent-dark);
  --sage: #C7C3F3;
  --mist: var(--accent-mist);
  --gold: var(--warm);
  --gold-dim: var(--warm-dark);
  --text: #111111;
  --dim: var(--muted);
  --card: #ffffff;
}

/* ---------- 2. Base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--bg); color: var(--ink); }
body {
  font-family: var(--font);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 1.5px solid var(--ink); outline-offset: 6px; }
img, svg { max-width: 100%; }
b, strong { font-weight: 500; }

/* ---------- 3. Site frame ---------- */
.links {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0 56px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.links a { display: inline-block; padding: 6px 0; }
.links a:hover, .links a[aria-current] { opacity: 0.45; }

.site-head { padding: 34px var(--gutter) 0; text-align: center; }
.site-foot { padding: 96px var(--gutter) 44px; text-align: center; }
.site-foot .links { gap: 0 60px; }

main { width: 100%; }
.page { padding: 110px var(--gutter) 0; }
.col { max-width: var(--col); margin: 0 auto; }

/* centred, single-idea pages (landing, team) */
.centre {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px var(--gutter);
  text-align: center;
}

/* ---------- 4. Typography ---------- */
.tagline {
  font-size: clamp(20px, 2.1vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 400;
  text-transform: lowercase;
}
.lead { text-align: center; margin-bottom: 140px; }
.lead h1 { margin-bottom: 28px; }
.lead p {
  max-width: 58ch;
  margin: 0 auto;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.55;
  letter-spacing: -0.01em;
}
.index {
  list-style: none;
  margin-top: 44px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 40px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.index a:hover { color: var(--ink); }

.label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.text { max-width: 62ch; font-size: 16px; line-height: 1.65; }
.text p + p { margin-top: 14px; }
.text.centre-text { margin-left: auto; margin-right: auto; text-align: center; }
.note { margin-top: 12px; font-size: 12px; color: var(--muted); max-width: 70ch; line-height: 1.5; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.accent { color: var(--accent); }

/* ---------- 5. Sections ---------- */
.part { padding-top: 40px; margin-bottom: 150px; border-top: 1px solid var(--ink); }
.part-head {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  align-items: baseline;
  margin-bottom: 56px;
}
.part-head .num { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.part-head h2 {
  font-size: clamp(22px, 2.4vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 400;
  text-transform: lowercase;
}
.block { margin-bottom: 88px; }
.block:last-child { margin-bottom: 0; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; margin-top: 40px; }
.pair figure { margin: 0; }

/* ---------- 6. Figures ---------- */
figure { margin: 40px 0 0; }
.shot { position: relative; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.shot img { display: block; width: 100%; height: auto; border-radius: var(--radius); }
.shot.narrow { max-width: 600px; }
.shot.mid { max-width: 760px; }
figcaption { margin-top: 14px; font-size: 13px; line-height: 1.5; color: var(--muted); max-width: 70ch; }
.marker, .legend .n {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 11px;
  line-height: 22px;
  text-align: center;
}
.marker { position: absolute; transform: translate(-50%, -50%); }
.legend {
  list-style: none;
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px 28px;
  font-size: 13px;
  line-height: 1.5;
}
.legend li { display: flex; gap: 10px; align-items: flex-start; }
.legend .n { flex: 0 0 22px; }
.graphic { width: 100%; margin: 40px auto 0; display: block; }
.graphic text { font-family: var(--font); fill: var(--ink); }
.graphic .m { fill: var(--muted); }
.graphic .mono { font-family: var(--mono); }

/* ---------- 7. Lists, rows, tables, figures of numbers ---------- */
.rows { list-style: none; margin-top: 40px; border-top: 1px solid var(--line); }
.rows li {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.55;
}
.rows .k { font-weight: 500; }
.pair .rows li { grid-template-columns: 120px 1fr; gap: 20px; padding: 14px 0; font-size: 13px; }

.kpis { list-style: none; margin-top: 40px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.kpis li { border-top: 1px solid var(--ink); padding-top: 14px; }
.kpis .v { font-size: clamp(24px, 2.6vw, 34px); letter-spacing: -0.03em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.kpis .k { margin-top: 8px; font-size: 13px; color: var(--muted); line-height: 1.45; }

table.data { width: 100%; border-collapse: collapse; margin-top: 30px; font-size: 14px; }
table.data th, table.data td { text-align: left; padding: 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { font-weight: 400; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
table.data td.num { font-family: var(--mono); font-size: 13px; white-space: nowrap; }

/* ---------- 8. Controls ---------- */
input[type=range] { width: 100%; accent-color: var(--ink); }
.bar { display: grid; grid-template-columns: 78px 1fr; align-items: center; gap: 12px; font-size: 12px; }
.bar i { display: block; height: 10px; background: var(--ink); border-radius: 2px; transition: width .25s ease; }
.bar.ref i { background: #c8c8c8; }

/* ============================================================
   9. Article (blog posts, whitepapers)
   ============================================================ */
.post-hero { padding: 96px var(--gutter) 56px; }
.post-hero .inner { max-width: 820px; }
.post-hero .kind {
  display: flex; flex-wrap: wrap; gap: 6px 14px;
  font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted);
}
.post-hero .kind b { font-weight: 400; color: var(--ink); }
.post-hero h1 {
  margin-top: 28px;
  font-size: clamp(26px, 3.2vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 400;
}
.post-hero h1 i { font-style: normal; color: var(--accent); }
.post-hero .abstract { margin-top: 24px; max-width: 66ch; font-size: 16.5px; line-height: 1.65; color: var(--ink); }
.post-hero .tags { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 12px; color: var(--muted); }
.post-hero .tags .warm { color: var(--warm-dark); }

.post-layout {
  padding: 0 var(--gutter) 40px;
  display: grid;
  grid-template-columns: 200px minmax(0, 700px);
  gap: 72px;
  align-items: start;
}
.toc { position: sticky; top: 40px; }
.toc .lbl { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; }
.toc ol { list-style: none; margin-top: 14px; counter-reset: toc; }
.toc li { counter-increment: toc; }
.toc a { display: block; font-size: 13px; color: var(--muted); padding: 6px 0 6px 28px; position: relative; }
.toc a::before { content: counter(toc, decimal-leading-zero); position: absolute; left: 0; font-family: var(--mono); font-size: 11px; color: var(--muted); }
.toc a:hover { color: var(--ink); }
.toc .dl { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 12px; line-height: 1.5; color: var(--muted); }

.article > section { margin-top: 72px; }
.article > section:first-child { margin-top: 8px; }
.kicker { display: flex; align-items: baseline; gap: 16px; margin-bottom: 8px; }
.kicker .no { font-family: var(--mono); font-size: 13px; color: var(--muted); flex-shrink: 0; }
.article h2 { font-size: clamp(22px, 2.4vw, 28px); line-height: 1.25; letter-spacing: -0.02em; font-weight: 400; }
.article h2 i { font-style: normal; color: var(--accent); }
.article h3 { font-size: 17px; font-weight: 500; margin-top: 36px; letter-spacing: -0.01em; }
.article h4 { font-size: 15px; font-weight: 500; }
.article p { margin-top: 16px; font-size: 15.5px; line-height: 1.7; }
.article p.dim { color: var(--muted); }
.article a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line); }
.article a:hover { text-decoration-color: var(--ink); }
.article sub, .article sup { font-size: 70%; }
.article ul.list { margin-top: 16px; list-style: none; }
.article ul.list li { font-size: 15px; line-height: 1.65; padding: 7px 0 7px 24px; position: relative; }
.article ul.list li::before { content: "—"; position: absolute; left: 0; color: var(--muted); }
.article ul.check li::before { content: "✓"; color: var(--accent); }
.article ol { margin-top: 16px; padding-left: 22px; font-size: 15px; line-height: 1.65; }
.article ol li { padding: 4px 0; }
.article .eyebrow { display: inline-block; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-ink); }

/* cards → framed figures */
.article .card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.article .chead {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  font-size: 13px; font-weight: 500;
}
.article .chead .sub { font-weight: 400; color: var(--muted); font-size: 12px; }
.article .cbody { padding: 18px 16px; }
.article .figure { margin-top: 32px; }
.article .figcap { margin-top: 12px; font-size: 12.5px; line-height: 1.5; color: var(--muted); }
.article .figcap b { color: var(--ink); }
.article .card > .figcap { padding: 0 16px 14px; margin-top: 0; }

.chip {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.02em;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--muted);
  white-space: nowrap;
}
.chip.gold { color: var(--warm-dark); border-color: var(--warm-08); background: var(--warm-08); }

.takeaway { margin-top: 28px; border-left: 2px solid var(--accent); padding: 4px 0 4px 22px; }
.takeaway .lbl { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-ink); }
.takeaway p { margin-top: 8px; font-size: 17px; line-height: 1.5; }

.pullq { margin: 40px 0 8px; }
.pullq blockquote {
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.45;
  letter-spacing: -0.01em;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.pullq .who { margin-top: 10px; font-size: 12.5px; color: var(--muted); }

.wp-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 32px; }
.wp-kpis .k { border-top: 1px solid var(--ink); padding-top: 12px; }
.wp-kpis .v { font-size: 26px; letter-spacing: -0.03em; line-height: 1.1; color: var(--accent); font-variant-numeric: tabular-nums; }
.wp-kpis .l { font-size: 12.5px; color: var(--muted); margin-top: 6px; line-height: 1.45; }

.aae { margin-top: 24px; border-top: 1px solid var(--line); }
.aae .row { padding: 16px 0; border-bottom: 1px solid var(--line); }
.aae .lbl { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-ink); }
.aae p { font-size: 14.5px; margin-top: 6px; line-height: 1.6; }
.aae .row.res .val { font-size: 22px; letter-spacing: -0.02em; color: var(--accent); margin-top: 6px; }

.wp-table { margin-top: 28px; overflow-x: auto; }
.wp-table table { width: 100%; border-collapse: collapse; font-size: 14px; }
.wp-table th { text-align: left; font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); font-weight: 400; padding: 12px 12px 12px 0; border-bottom: 1px solid var(--ink); }
.wp-table td { padding: 12px 12px 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; line-height: 1.5; }
.wp-table td .serifv { font-family: var(--mono); font-size: 14px; color: var(--accent); white-space: nowrap; }

.wp-steps { margin-top: 28px; border-top: 1px solid var(--line); }
.wp-step { display: grid; grid-template-columns: 130px 1fr; gap: 22px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.wp-step .when { font-family: var(--mono); font-size: 12px; color: var(--muted); padding-top: 3px; }
.wp-step .when.warn { color: var(--warm-dark); }
.wp-step h4 { font-size: 15px; font-weight: 500; }
.wp-step p { font-size: 14px; color: var(--muted); margin-top: 6px; line-height: 1.6; }

.sysrow, .systems { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.sysitem { font-size: 12.5px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 100px; color: var(--muted); }
.sysitem b { color: var(--ink); }

.codeblock { margin-top: 24px; background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.codeblock .chead { border-bottom: 1px solid var(--line); background: transparent; }
.codeblock pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 12.5px; line-height: 1.65; color: var(--ink); }
.codeblock .cm { color: var(--muted); }
.codeblock .kw { color: var(--accent-ink); }
.codeblock .st { color: var(--warm-dark); }

.promptcard { margin-top: 24px; border-left: 2px solid var(--warm); padding: 4px 0 4px 22px; }
.promptcard .lbl { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--warm-dark); }
.promptcard p { margin-top: 8px; font-size: 15px; line-height: 1.6; }

.vignette { margin-top: 24px; }
.vignette .aae { border-top: none; }

.case { margin-top: 32px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 28px 0; display: grid; grid-template-columns: 1.3fr .7fr; gap: 36px; align-items: center; }
.case blockquote { font-size: clamp(17px, 1.9vw, 20px); line-height: 1.45; letter-spacing: -0.01em; }
.case .who { margin-top: 14px; font-size: 13px; color: var(--muted); }
.case .who b { color: var(--ink); }
.case .nums { display: grid; gap: 14px; }
.case .nums .n { border-left: 2px solid var(--accent); padding-left: 14px; }
.case .nums .v { font-size: 22px; letter-spacing: -0.02em; color: var(--accent); line-height: 1.1; }
.case .nums .l { font-size: 12px; color: var(--muted); margin-top: 2px; }

.ledger .lrow { display: grid; grid-template-columns: 36px 1fr auto; gap: 16px; align-items: start; padding: 14px 0; border-bottom: 1px solid var(--line); }
.ledger .lrow:last-child { border-bottom: none; }
.ledger .avatar { width: 36px; height: 36px; border-radius: 50%; color: #fff; font-size: 11px; font-weight: 500; display: flex; align-items: center; justify-content: center; }
.ledger .info b { display: block; font-size: 14px; font-weight: 500; }
.ledger .info span { display: block; font-size: 13px; color: var(--muted); margin-top: 3px; line-height: 1.5; }
.ledger .kpi { text-align: right; min-width: 100px; }
.ledger .kpi .v { font-family: var(--mono); font-size: 13.5px; color: var(--accent); }
.ledger .kpi .l { font-size: 11.5px; color: var(--muted); margin-top: 2px; }
.sum { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 14px 16px; border-top: 1px solid var(--ink); font-size: 13px; }
.sum .v { font-family: var(--mono); font-size: 15px; color: var(--accent); white-space: nowrap; }

.post-end { padding: 72px var(--gutter) 0; }
.post-end .inner { max-width: 700px; margin-left: calc(200px + 72px); font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 20px; display: flex; flex-wrap: wrap; gap: 8px 32px; }
.post-end a { color: var(--ink); }

/* ---------- 10. Blog index ---------- */
.posts { list-style: none; border-top: 1px solid var(--ink); }
.posts li { border-bottom: 1px solid var(--line); }
.posts a.post { display: grid; grid-template-columns: 160px 1fr; gap: 32px; padding: 28px 0; }
.posts a.post:hover .t { color: var(--accent-ink); }
.posts .meta { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); line-height: 1.7; }
.posts .meta b { display: block; font-weight: 400; color: var(--ink); }
.posts .t { font-size: 18px; line-height: 1.35; letter-spacing: -0.015em; }
.posts .t i { font-style: normal; }
.posts .s { margin-top: 10px; font-size: 14px; line-height: 1.55; color: var(--muted); max-width: 66ch; }
.posts .tg { margin-top: 12px; font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 16px; }
.filters { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 28px; margin-bottom: 36px; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.filters a[aria-current] { color: var(--ink); }

/* ---------- 11. Responsive ---------- */
@media (max-width: 960px) {
  .post-layout { grid-template-columns: 1fr; gap: 40px; }
  .toc { position: static; border-bottom: 1px solid var(--line); padding-bottom: 24px; }
  .post-end .inner { margin-left: 0; }
}
@media (max-width: 820px) {
  :root { --gutter: 20px; }
  .site-head { padding-top: 26px; }
  .links { gap: 6px 26px; font-size: 11px; }
  .page { padding-top: 64px; }
  .lead { margin-bottom: 88px; }
  .part { margin-bottom: 100px; }
  .part-head { grid-template-columns: 1fr; gap: 8px; margin-bottom: 40px; }
  .block { margin-bottom: 64px; }
  .pair { grid-template-columns: 1fr; }
  .rows li { grid-template-columns: 1fr; gap: 6px; }
  .kpis, .wp-kpis { grid-template-columns: 1fr; gap: 20px; }
  .marker, .legend .n { width: 18px; height: 18px; line-height: 18px; font-size: 10px; }
  .site-foot { padding: 64px 20px 32px; }
  .post-hero { padding-top: 56px; }
  .wp-step { grid-template-columns: 1fr; gap: 6px; }
  .case { grid-template-columns: 1fr; }
  .posts a.post { grid-template-columns: 1fr; gap: 10px; }
  .ledger .lrow { grid-template-columns: 36px 1fr; }
  .ledger .kpi { grid-column: 2; text-align: left; }
}