/* =========================================================
   THE COGNITIVE BOARD — Main stylesheet
   Tech avant-gardiste · cognitive aesthetic
   ========================================================= */

/* --- Reset & base --------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; height: auto; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
a { color: inherit; text-decoration: none; }

/* --- Design tokens -------------------------------------- */
:root {
  --paper: #F5F3EE;
  --vellum: #FBFAF6;
  --ink: #0A0E1A;
  --graphite: #3C3D3F;
  --trace: #D8D5CD;
  --trace-soft: rgba(10, 14, 26, 0.08);
  --cognitive: #1E2BFF;
  --cognitive-deep: #0F1A8A;
  --ember: #FF4E20;

  --font-display: "Newsreader", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-hero: clamp(2.8rem, 6vw, 5.2rem);
  --fs-display: clamp(2rem, 4vw, 3.4rem);
  --fs-h2: clamp(1.6rem, 3vw, 2.4rem);
  --fs-h3: 1.35rem;
  --fs-lead: clamp(1.1rem, 1.4vw, 1.35rem);
  --fs-body: 1.05rem;
  --fs-meta: 0.78rem;
  --fs-stat: clamp(3.5rem, 8vw, 6rem);

  --rail: clamp(20px, 4vw, 56px);
  --max-w: 1240px;
  --max-prose: 720px;
  --section-y: clamp(80px, 12vw, 160px);

  --ease: cubic-bezier(.2, .8, .2, 1);
}

/* --- Body ----------------------------------------------- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  font-feature-settings: "ss01", "cv11";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: var(--cognitive); color: var(--paper); }

/* --- Focus ---------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--cognitive);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- Type ----------------------------------------------- */
h1, h2, h3, h4, .display { font-family: var(--font-display); font-weight: 400; letter-spacing: -0.01em; line-height: 1.08; }
h1 { font-size: var(--fs-hero); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-display); }
h3 { font-size: var(--fs-h2); }
h4 { font-family: var(--font-body); font-size: var(--fs-h3); font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; }

.lead {
  font-family: var(--font-body);
  font-size: var(--fs-lead);
  line-height: 1.55;
  color: var(--graphite);
  max-width: 56ch;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--cognitive);
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--cognitive);
}

.meta {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

em, i { font-style: italic; }
strong, b { font-weight: 600; color: var(--ink); }

p { max-width: var(--max-prose); }

/* --- Layout primitives ---------------------------------- */
.wrap { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 var(--rail); }
.section { padding: var(--section-y) 0; position: relative; }
.section--tight { padding: clamp(48px, 8vw, 96px) 0; }

.section + .section { border-top: 1px solid var(--trace-soft); }

.divider {
  display: block;
  height: 1px;
  background: var(--trace);
  border: 0;
  margin: 0;
}

/* --- Skip to content ------------------------------------ */
.skip {
  position: absolute;
  left: -9999px;
  top: 8px;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 14px;
  z-index: 999;
  border-radius: 4px;
}
.skip:focus { left: 8px; }

/* --- Header --------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 243, 238, 0.85);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--trace-soft);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}
.brand {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  position: relative;
}
.brand-mark svg { width: 100%; height: 100%; display: block; }

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 32px);
}
.nav-links a {
  font-size: 0.94rem;
  position: relative;
  padding: 4px 0;
  color: var(--ink);
  transition: color 200ms var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--cognitive);
  transition: right 250ms var(--ease);
}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after { right: 0; }
.nav-links a[aria-current="page"] { color: var(--cognitive); }

.lang-switch {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 6px 10px;
  border: 1px solid var(--trace);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}
.lang-switch:hover { border-color: var(--cognitive); color: var(--cognitive); }

.nav-toggle { display: none; }

/* Mobile nav */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--trace);
    border-radius: 999px;
  }
  .nav-toggle svg { width: 18px; height: 18px; }
  .nav-links {
    position: fixed;
    inset: 64px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    align-items: flex-start;
    padding: 32px var(--rail);
    gap: 18px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform 280ms var(--ease), opacity 220ms var(--ease);
    border-bottom: 1px solid var(--trace-soft);
  }
  .nav.is-open .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { font-size: 1.4rem; font-family: var(--font-display); }
}

/* --- Hero ----------------------------------------------- */
.hero {
  padding-top: clamp(80px, 14vw, 160px);
  padding-bottom: clamp(80px, 14vw, 160px);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: end;
}
.hero h1 { max-width: 14ch; }
.hero .lead { margin-top: 28px; max-width: 48ch; }
.hero-aside { display: flex; flex-direction: column; gap: 16px; align-self: end; }
.hero-aside .meta { color: var(--graphite); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* Hero ambient glyph */
.hero-glyph {
  position: absolute;
  right: calc(var(--rail) * -1);
  top: 30%;
  width: clamp(280px, 38vw, 520px);
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}
.hero > .wrap { position: relative; z-index: 1; }

/* --- Buttons -------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.96rem;
  letter-spacing: 0;
  transition: transform 200ms var(--ease), background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
  border: 1px solid transparent;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--cognitive); }
.btn-ghost { border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn .arrow { transition: transform 220ms var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }

/* --- Stat block ----------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(24px, 4vw, 64px);
}
@media (max-width: 980px) { .stats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .stats { grid-template-columns: 1fr; } }

.stat { border-top: 1px solid var(--ink); padding-top: 20px; }
.stat-num {
  font-family: var(--font-display);
  font-size: var(--fs-stat);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.stat-num sup {
  font-size: 0.42em;
  vertical-align: top;
  margin-left: 2px;
  color: var(--cognitive);
}
.stat-label {
  margin-top: 14px;
  font-size: 0.98rem;
  line-height: 1.45;
  max-width: 32ch;
  color: var(--graphite);
}
.stat-source {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--graphite);
  opacity: 0.7;
}

/* --- Section heading ------------------------------------ */
.section-head {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(40px, 6vw, 96px);
  margin-bottom: clamp(48px, 6vw, 88px);
  align-items: end;
}
.section-head h2 { max-width: 12ch; }
.section-head .lead { max-width: 56ch; }

@media (max-width: 860px) {
  .section-head { grid-template-columns: 1fr; gap: 24px; }
}

/* --- Manifesto block ------------------------------------ */
.manifesto {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 24ch;
}
.manifesto p + p { margin-top: 1em; }
.manifesto em { color: var(--cognitive); font-style: italic; }

.manifesto-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 96px);
}
.manifesto-grid .body p + p { margin-top: 1.2em; }
@media (max-width: 860px) { .manifesto-grid { grid-template-columns: 1fr; } }

/* --- Cards (services, frameworks) ----------------------- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--trace);
  border: 1px solid var(--trace);
}
.cards--three { grid-template-columns: repeat(3, 1fr); }
.cards--four { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 980px) { .cards, .cards--three, .cards--four { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .cards, .cards--three, .cards--four { grid-template-columns: 1fr; } }

.card {
  background: var(--paper);
  padding: clamp(28px, 3.4vw, 44px);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 280px;
  transition: background 220ms var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-left: 2px solid transparent;
  transition: border-color 220ms var(--ease);
  pointer-events: none;
}
.card:hover { background: var(--vellum); }
.card:hover::before { border-left-color: var(--cognitive); }

.card-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--cognitive);
}
.card h4 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 500; line-height: 1.2; }
.card p { font-size: 0.98rem; color: var(--graphite); line-height: 1.55; }
.card ul { display: flex; flex-direction: column; gap: 8px; font-size: 0.95rem; color: var(--graphite); }
.card ul li { padding-left: 20px; position: relative; }
.card ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.65em;
  width: 8px; height: 1px;
  background: var(--cognitive);
}

.card-footer {
  margin-top: auto;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* --- Inline link ---------------------------------------- */
.link {
  color: var(--ink);
  border-bottom: 1px solid var(--cognitive);
  padding-bottom: 1px;
  transition: color 200ms var(--ease);
}
.link:hover { color: var(--cognitive); }

/* --- Pull quote / Quote --------------------------------- */
.pullquote {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 32ch;
  position: relative;
  padding-left: 24px;
  border-left: 2px solid var(--cognitive);
}
.pullquote cite {
  display: block;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: var(--fs-meta);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--graphite);
}

/* --- Insight cards -------------------------------------- */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--trace);
  border: 1px solid var(--trace);
}
@media (max-width: 980px) { .insights-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .insights-grid { grid-template-columns: 1fr; } }
.insight {
  background: var(--paper);
  padding: clamp(28px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background 220ms var(--ease);
}
.insight:hover { background: var(--vellum); }
.insight h4 { font-family: var(--font-display); font-weight: 500; font-size: 1.4rem; line-height: 1.25; }
.insight p { font-size: 0.96rem; color: var(--graphite); }
.insight .meta { margin-top: auto; }

/* --- Footer --------------------------------------------- */
.site-footer {
  background: var(--ink);
  color: rgba(245, 243, 238, 0.78);
  padding: clamp(60px, 9vw, 120px) 0 40px;
  margin-top: clamp(80px, 12vw, 160px);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: clamp(32px, 4vw, 64px);
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(245, 243, 238, 0.12);
}
@media (max-width: 860px) { .footer-top { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-top { grid-template-columns: 1fr; } }

.footer-top h5 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: rgba(245, 243, 238, 0.5);
  margin-bottom: 18px;
  font-weight: 500;
}
.footer-top ul { display: flex; flex-direction: column; gap: 10px; font-size: 0.96rem; }
.footer-top a:hover { color: var(--paper); border-bottom: 1px solid var(--cognitive); }

.footer-brand .brand { font-size: 1.5rem; color: var(--paper); margin-bottom: 16px; }
.footer-brand p { max-width: 38ch; color: rgba(245, 243, 238, 0.6); font-size: 0.96rem; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 28px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(245, 243, 238, 0.4);
}

.sister-sites {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sister-sites a {
  font-family: var(--font-display);
  font-size: 1.15rem;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  opacity: 0.85;
}
.sister-sites a.coming::after {
  content: "Bientôt";
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 3px 8px;
  background: rgba(245, 243, 238, 0.06);
  border-radius: 999px;
  color: rgba(245, 243, 238, 0.5);
}
[lang="en"] .sister-sites a.coming::after { content: "Soon"; }

/* --- Animations ----------------------------------------- */
[data-animate] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
  will-change: opacity, transform;
}
[data-animate].is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  [data-animate] { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* --- Article prose -------------------------------------- */
.prose {
  max-width: var(--max-prose);
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--ink);
}
.prose > * + * { margin-top: 1.2em; }
.prose h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); margin-top: 1.6em; }
.prose h3 { font-size: 1.45rem; margin-top: 1.4em; font-family: var(--font-display); font-weight: 500; }
.prose blockquote {
  padding-left: 24px;
  border-left: 2px solid var(--cognitive);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.3rem;
  line-height: 1.4;
  color: var(--ink);
  margin: 1.6em 0;
}
.prose ul, .prose ol { padding-left: 1.4em; }
.prose ul li { list-style: none; position: relative; padding-left: 12px; }
.prose ul li::before { content: ""; position: absolute; left: -12px; top: 0.75em; width: 6px; height: 1px; background: var(--cognitive); }
.prose ol { list-style: decimal; }
.prose ol li { padding-left: 4px; }
.prose a { color: var(--ink); border-bottom: 1px solid var(--cognitive); }
.prose a:hover { color: var(--cognitive); }

/* --- Page header (sub-pages) ---------------------------- */
.page-header {
  padding-top: clamp(60px, 10vw, 120px);
  padding-bottom: clamp(40px, 6vw, 80px);
  border-bottom: 1px solid var(--trace-soft);
}
.page-header h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); max-width: 16ch; }
.page-header .lead { margin-top: 28px; }

/* --- Form ----------------------------------------------- */
.contact-form { display: grid; gap: 24px; max-width: 560px; }
.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--graphite);
}
.contact-form input,
.contact-form textarea {
  font: inherit;
  font-family: var(--font-body);
  font-size: 1rem;
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink);
  background: var(--vellum);
  border: 1px solid var(--trace);
  border-radius: 4px;
  padding: 14px 16px;
  transition: border-color 200ms var(--ease);
}
.contact-form input:focus,
.contact-form textarea:focus { outline: none; border-color: var(--cognitive); }
.contact-form textarea { min-height: 160px; resize: vertical; }

/* --- Utilities ------------------------------------------ */
.text-center { text-align: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--trace);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--graphite);
}

/* --- Section accent rail -------------------------------- */
.section--feature {
  background: var(--vellum);
}

/* --- Cognitive mark (logo) ------------------------------ */
.cog-mark { color: var(--cognitive); }