/* ReqPOOL TRANSFORM Knowledge Core — monochrome editorial design */

:root {
  --ink: #000;
  --paper: #fff;
  --grey-1: #f6f6f6;
  --grey-2: #e6e6e6;
  --grey-3: #9a9a9a;
  --grey-4: #555;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max: 1140px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

a { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--grey-4); }

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--ink);
  background: var(--paper);
  position: sticky; top: 0; z-index: 50;
}
.site-header .bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand:hover { color: var(--ink); }
.brand .logo {
  display: block; height: 20px; width: auto; box-sizing: content-box;
  background: var(--ink); padding: 5px 10px;
}
.brand .sub {
  font-size: 11px; text-transform: uppercase; letter-spacing: .18em; color: var(--grey-4);
}
.site-nav { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.site-nav a {
  font-size: 13px; text-transform: uppercase; letter-spacing: .12em;
  text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent;
}
.site-nav a:hover, .site-nav a[aria-current="true"] { border-bottom-color: var(--ink); color: var(--ink); }
.lang-switch {
  font-size: 12px; letter-spacing: .12em; text-transform: uppercase;
  border: 1px solid var(--ink); padding: 5px 12px; text-decoration: none;
}
.lang-switch:hover { background: var(--ink); color: var(--paper); }

/* mobile navigation (CSS-only hamburger) */
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-burger { display: none; cursor: pointer; padding: 10px 2px; margin-left: auto; }
.nav-burger span {
  display: block; width: 26px; height: 2px; background: var(--ink);
  margin: 6px 0; transition: transform .2s, opacity .2s;
}

/* ---------- Hero ---------- */

.hero { padding: 84px 0 64px; border-bottom: 1px solid var(--grey-2); }
.kicker {
  font-size: 12px; text-transform: uppercase; letter-spacing: .22em;
  color: var(--grey-4); margin-bottom: 22px;
}
.kicker .num { color: var(--ink); font-weight: 700; margin-right: 10px; }
h1 {
  font-family: var(--serif); font-weight: 400; font-size: clamp(38px, 6vw, 64px);
  line-height: 1.08; letter-spacing: -.01em; max-width: 20ch;
}
.hero .subtitle {
  font-family: var(--serif); font-size: clamp(20px, 2.6vw, 26px); line-height: 1.35;
  color: var(--grey-4); margin-top: 18px; max-width: 34ch;
}
.hero .lead { font-size: 19px; max-width: 62ch; margin-top: 28px; }
.hero .actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block; background: var(--ink); color: var(--paper);
  font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
  padding: 13px 26px; text-decoration: none; border: 1px solid var(--ink);
}
.btn:hover { background: var(--paper); color: var(--ink); }
.btn.ghost { background: var(--paper); color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }

/* ---------- Sections ---------- */

section { padding: 64px 0; border-bottom: 1px solid var(--grey-2); }
section:last-of-type { border-bottom: 0; }
h2 {
  font-family: var(--serif); font-weight: 400; font-size: clamp(28px, 3.6vw, 38px);
  line-height: 1.15; margin-bottom: 10px; max-width: 28ch;
}
.section-label {
  font-size: 12px; text-transform: uppercase; letter-spacing: .2em; color: var(--grey-4);
  margin-bottom: 14px;
}
.section-intro { font-size: 18px; max-width: 64ch; color: var(--grey-4); margin-bottom: 36px; }
h3 { font-family: var(--sans); font-weight: 700; font-size: 18px; margin-bottom: 6px; }

/* ---------- Infographic: chevron flow ---------- */

.flow { margin: 36px 0 8px; }
.flow svg { width: 100%; height: auto; display: block; }
.flow a { text-decoration: none; }
.flow a:hover polygon { fill-opacity: .88; }
.flow-caption { font-size: 13px; color: var(--grey-3); margin-top: 10px; }

/* anchors must not hide under the sticky header */
section[id] { scroll-margin-top: 84px; }

/* ---------- Infographic: numbered stepper ---------- */

.stepper { counter-reset: step; display: grid; gap: 0; margin-top: 36px; }
.step {
  display: grid; grid-template-columns: 92px 1fr; gap: 28px;
  padding: 30px 0; border-top: 1px solid var(--grey-2); position: relative;
}
.step:last-child { border-bottom: 1px solid var(--grey-2); }
.step .no {
  font-family: var(--serif); font-size: 46px; line-height: 1; color: var(--ink);
}
.step .no::after {
  content: ""; display: block; width: 34px; height: 3px; background: var(--ink); margin-top: 12px;
}
.step h3 { font-size: 19px; }
.step p { color: var(--grey-4); max-width: 68ch; }

/* horizontal mini-stepper infographic */
.rail { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin: 40px 0 8px; }
.rail .node { position: relative; padding: 26px 14px 0 0; }
.rail .node::before {
  content: attr(data-n); display: inline-grid; place-items: center;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--ink); color: var(--paper);
  font-family: var(--serif); font-size: 19px;
}
.rail .node::after {
  content: ""; position: absolute; top: 48px; left: 52px; right: 0; height: 1px; background: var(--ink);
}
.rail .node:last-child::after { display: none; }
.rail .node b { display: block; font-size: 14px; letter-spacing: .02em; margin-top: 14px; line-height: 1.4; }

/* ---------- Cards ---------- */

.grid { display: grid; gap: 28px; margin-top: 36px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { border-top: 3px solid var(--ink); padding-top: 18px; }
.card .idx { font-family: var(--serif); font-size: 30px; margin-bottom: 8px; display: block; }
.card p { color: var(--grey-4); font-size: 15.5px; }
.card a.more { font-size: 13px; text-transform: uppercase; letter-spacing: .12em; text-decoration: none;
  border-bottom: 1px solid var(--ink); display: inline-block; margin-top: 12px; }

/* phase cards on overview */
.phase-card { border: 1px solid var(--grey-2); padding: 26px; display: flex; flex-direction: column; text-decoration: none; transition: border-color .15s; }
.phase-card:hover { border-color: var(--ink); color: var(--ink); }
.phase-card .num { font-family: var(--serif); font-size: 15px; color: var(--grey-3); }
.phase-card .name { font-family: var(--serif); font-size: 26px; margin: 6px 0 10px; }
.phase-card p { font-size: 15px; color: var(--grey-4); flex: 1; }
.phase-card .go { margin-top: 16px; font-size: 12px; text-transform: uppercase; letter-spacing: .14em; }

/* ---------- Tables ---------- */

.tbl-wrap { overflow-x: auto; margin-top: 36px; }
table.matrix { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 720px; }
table.matrix th {
  text-align: left; font-size: 11.5px; text-transform: uppercase; letter-spacing: .14em;
  color: var(--grey-4); font-weight: 600; padding: 12px 18px 12px 0;
  border-bottom: 2px solid var(--ink);
}
table.matrix td { padding: 16px 18px 16px 0; border-bottom: 1px solid var(--grey-2); vertical-align: top; }
table.matrix td.name { font-weight: 700; white-space: nowrap; }
table.matrix td .src { display: block; font-size: 13px; color: var(--grey-3); margin-top: 4px; }
table.matrix td.phase { font-family: var(--serif); font-size: 18px; white-space: nowrap; }
.chip {
  display: inline-block; border: 1px solid var(--ink); padding: 2px 10px; margin: 2px 6px 2px 0;
  font-size: 12.5px; letter-spacing: .02em; white-space: nowrap;
}

/* ---------- Lists ---------- */

ul.ticks, ol.plain { list-style: none; margin-top: 26px; }
ul.ticks li {
  padding: 13px 0 13px 34px; border-bottom: 1px solid var(--grey-2); position: relative;
  max-width: 74ch;
}
ul.ticks li::before {
  content: ""; position: absolute; left: 2px; top: 21px; width: 14px; height: 8px;
  border-left: 2px solid var(--ink); border-bottom: 2px solid var(--ink); transform: rotate(-45deg);
}
ul.dashes { list-style: none; margin-top: 20px; }
ul.dashes li { padding: 8px 0 8px 26px; position: relative; max-width: 74ch; }
ul.dashes li::before { content: ""; position: absolute; left: 0; top: 19px; width: 14px; height: 2px; background: var(--ink); }

/* two-column definition rows (features) */
.feature { display: grid; grid-template-columns: minmax(200px, 280px) 1fr; gap: 24px; padding: 22px 0; border-top: 1px solid var(--grey-2); }
.feature:last-child { border-bottom: 1px solid var(--grey-2); }
.feature h3 { font-size: 16.5px; }
.feature p { color: var(--grey-4); font-size: 15.5px; max-width: 68ch; }

/* links list */
.reflist { margin-top: 30px; }
.ref { padding: 18px 0; border-top: 1px solid var(--grey-2); max-width: 76ch; }
.ref:last-child { border-bottom: 1px solid var(--grey-2); }
.ref a { font-weight: 700; font-size: 16px; }
.ref p { font-size: 14.5px; color: var(--grey-4); margin-top: 4px; }
.ref .url { font-size: 13px; color: var(--grey-3); word-break: break-all; }

/* ---------- Callouts ---------- */

.panel { background: var(--grey-1); border-left: 4px solid var(--ink); padding: 28px 32px; margin-top: 36px; max-width: 860px; }
.panel h3 { margin-bottom: 8px; }
.panel p { color: var(--grey-4); }
.panel .btn { margin-top: 18px; }

.gate-box { border: 2px solid var(--ink); padding: 30px 34px; margin-top: 36px; max-width: 860px; }
.gate-box h3 { text-transform: uppercase; font-size: 14px; letter-spacing: .16em; margin-bottom: 4px; }
.gate-box .gate-note { font-size: 14.5px; color: var(--grey-4); margin-bottom: 8px; }

/* ---------- Phase navigation ---------- */

.phase-nav { display: flex; justify-content: space-between; gap: 20px; padding: 40px 0; }
.phase-nav a { text-decoration: none; max-width: 46%; }
.phase-nav .dir { font-size: 11px; text-transform: uppercase; letter-spacing: .16em; color: var(--grey-4); display: block; margin-bottom: 6px; }
.phase-nav .t { font-family: var(--serif); font-size: 22px; border-bottom: 1px solid var(--ink); }
.phase-nav .next { text-align: right; margin-left: auto; }

/* ---------- Stat band ---------- */

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; margin-top: 40px; }
.stat .v { font-family: var(--serif); font-size: 56px; line-height: 1; }
.stat .l { font-size: 13.5px; color: var(--grey-4); margin-top: 8px; max-width: 26ch; }

/* ---------- Platform layer infographic ---------- */

.layers { margin-top: 40px; max-width: 860px; }
.layer { border: 1px solid var(--ink); padding: 18px 24px; margin-bottom: 10px; display: flex; justify-content: space-between; gap: 18px; align-items: baseline; flex-wrap: wrap; }
.layer.core { background: var(--ink); color: var(--paper); }
.layer .l-name { font-weight: 700; font-size: 16px; }
.layer .l-desc { font-size: 13.5px; color: var(--grey-4); }
.layer.core .l-desc { color: var(--grey-2); }

/* ---------- Suite lifecycle blueprint infographic ---------- */

.bp { margin-top: 44px; }
.bp-entries { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: stretch; }
.bp-col { display: flex; flex-direction: column; align-items: center; }
.bp-entry { width: 100%; padding: 22px 26px; border: 1px solid var(--ink); }
.bp-entry.dark { background: var(--ink); color: var(--paper); }
.bp-elabel { display: block; font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--grey-3); }
.bp-ename { display: block; font-family: var(--serif); font-size: 30px; line-height: 1.1; margin: 4px 0 8px; }
.bp-entry p { font-size: 14px; line-height: 1.5; color: var(--grey-4); }
.bp-entry.dark p { color: var(--grey-2); }
.bp-line { width: 1px; height: 26px; background: var(--ink); flex: none; }

.bp-card { position: relative; width: 100%; border: 1px solid var(--grey-2); padding: 24px 28px; background: var(--paper); }
.bp-card.bp-grow { flex: 1; }
.bp-card .c { position: absolute; width: 11px; height: 11px; border: 2px solid var(--ink); }
.bp-card .c.tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.bp-card .c.tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.bp-card .c.bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.bp-card .c.br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.bp-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 8px; }
.bp-num { font-family: var(--serif); font-size: 30px; line-height: 1; color: var(--grey-3); }
.bp-head h3 { font-size: 20px; margin: 0; }
.bp-head a { text-decoration: none; border-bottom: 1px solid var(--ink); }
.bp-head a:hover { color: var(--grey-4); }
.bp-desc { font-size: 14.5px; line-height: 1.55; color: var(--grey-4); }
.bp-bullets { list-style: none; margin: 0; }
.bp-bullets li { position: relative; padding: 3px 0 3px 18px; font-size: 14.5px; line-height: 1.5; color: var(--grey-4); }
.bp-bullets li::before { content: ""; position: absolute; left: 0; top: 13px; width: 10px; height: 2px; background: var(--ink); }
.bp-kpi { border-left: 2px solid var(--ink); padding-left: 12px; margin: 12px 0 2px; }
.bp-kpi span { font-size: 11px; font-weight: 700; letter-spacing: .16em; }
.bp-kpi p { font-size: 13.5px; color: var(--grey-4); }
.bp-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.bp-tool { background: var(--ink); color: var(--paper); font-size: 12.5px; font-weight: 700; padding: 6px 14px; text-decoration: none; white-space: nowrap; }
.bp-tool:hover { background: var(--paper); color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.bp-tool.soon { background: var(--paper); color: var(--grey-4); border: 1px dashed var(--grey-3); font-weight: 400; }
.bp-sub { border-left: 2px solid var(--ink); padding-left: 14px; margin: 12px 0 16px; }
.bp-sub b { font-size: 15px; }
.bp-sub p { font-size: 14px; line-height: 1.5; color: var(--grey-4); margin: 2px 0 0; }
.bp-sub .bp-tools { margin-top: 8px; }

.bp-gate { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 2px 0; }
.bp-diamond { width: 30px; height: 30px; border: 1.5px solid var(--ink); transform: rotate(45deg); display: grid; place-items: center; background: var(--paper); }
.bp-diamond i { transform: rotate(-45deg); font-style: normal; font-weight: 700; font-size: 12px; font-family: var(--serif); }
.bp-glabel { font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--grey-4); text-align: center; max-width: 32ch; }

.bp-merge { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 18px; margin: 38px 0; }
.bp-merge::before, .bp-merge::after { content: ""; height: 1px; background: var(--ink); }
.bp-merge span { font-size: 12px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; text-align: center; }
.bp-main { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; }
.bp-main .bp-card { width: 100%; }
.bp-loop { text-align: center; font-size: 13.5px; color: var(--grey-4); margin-top: 28px; }

@media (max-width: 860px) {
  .bp-entries { grid-template-columns: 1fr; gap: 0; }
  .bp-col + .bp-col { margin-top: 30px; }
  .bp-card { padding: 20px; }
  .bp-merge span { letter-spacing: .1em; }
}

/* ---------- Footer ---------- */

.site-footer { border-top: 1px solid var(--ink); margin-top: 40px; padding: 44px 0 60px; font-size: 14px; }
.site-footer .cols { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; }
.site-footer .conf { text-transform: uppercase; letter-spacing: .14em; font-size: 11.5px; margin-bottom: 14px; }
.site-footer p { color: var(--grey-4); max-width: 64ch; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { text-decoration: none; border-bottom: 1px solid var(--grey-3); }

/* ---------- Download rows ---------- */

.dl-row { display: grid; grid-template-columns: 64px 1fr auto; gap: 22px; align-items: center; padding: 22px 0; border-top: 1px solid var(--grey-2); }
.dl-row:last-child { border-bottom: 1px solid var(--grey-2); }
.dl-row .pdf-ico { width: 46px; height: 58px; border: 2px solid var(--ink); position: relative; display: grid; place-items: end center; padding-bottom: 6px; font-size: 10px; font-weight: 700; letter-spacing: .08em; }
.dl-row .pdf-ico::before { content: ""; position: absolute; top: -2px; right: -2px; border: 8px solid transparent; border-top-color: var(--paper); border-right-color: var(--paper); }
.dl-row h3 { font-size: 17px; }
.dl-row p { font-size: 14px; color: var(--grey-4); }
.dl-row .btn { padding: 10px 18px; font-size: 12px; }

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  /* header: brand left, burger right, nav as collapsible full-width panel */
  .site-header .bar { flex-wrap: wrap; gap: 12px; padding: 12px 0; }
  .nav-burger { display: block; }
  .site-nav {
    display: none; width: 100%; flex-direction: column; align-items: stretch;
    gap: 0; padding: 4px 0 14px;
  }
  .nav-toggle:checked ~ .site-nav { display: flex; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
  .site-nav a {
    font-size: 14px; padding: 14px 2px; border-top: 1px solid var(--grey-2);
    border-bottom: 0;
  }
  .site-nav a:hover, .site-nav a[aria-current="true"] { border-bottom: 0; font-weight: 700; }
  .site-nav .lang-switch {
    margin-top: 14px; align-self: flex-start; padding: 8px 18px;
    border: 1px solid var(--ink);
  }
  section[id] { scroll-margin-top: 70px; }

  /* phase chevron flow: scroll instead of shrink */
  .flow { overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 6px; }
  .flow svg { min-width: 880px; }

  .step { grid-template-columns: 64px 1fr; gap: 18px; }
  .step .no { font-size: 34px; }
  .feature { grid-template-columns: 1fr; gap: 6px; }
  .site-footer .cols { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 44px; }
  section { padding: 48px 0; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .brand .sub { display: none; }
  .hero .lead { font-size: 17px; }
  .stat .v { font-size: 44px; }

  /* mini-stepper: vertical with connecting line */
  .rail { grid-template-columns: 1fr; margin: 30px 0 4px; }
  .rail .node {
    display: grid; grid-template-columns: 44px 1fr; align-items: center;
    gap: 16px; padding: 12px 0;
  }
  .rail .node::before { grid-row: 1; }
  .rail .node::after {
    top: 56px; bottom: -12px; left: 21px; right: auto; width: 1px; height: auto;
  }
  .rail .node b { margin-top: 0; font-size: 15px; }

  /* download rows: button on its own line */
  .dl-row { grid-template-columns: 48px 1fr; gap: 16px; }
  .dl-row .pdf-ico { width: 40px; height: 50px; }
  .dl-row .btn { grid-column: 1 / -1; justify-self: start; }

  /* prev/next: stacked */
  .phase-nav { flex-direction: column; gap: 26px; }
  .phase-nav a { max-width: 100%; }
  .phase-nav .next { text-align: left; margin-left: 0; }

  /* suite layer diagram + panels */
  .layer { flex-direction: column; gap: 4px; }
  .panel { padding: 22px 20px; }
  .gate-box { padding: 22px 20px; }

  .btn { padding: 12px 20px; }
  table.matrix { font-size: 14px; }
}

@media print {
  .site-header, .site-footer, .phase-nav, .actions { display: none; }
  body { font-size: 12pt; }
  a { text-decoration: none; }
}