:root {
    --brand-dark: #0F043C;
    --brand-dark-2: #1B0F52;
    --accent: #D32E33;
    --accent-deep: #A62327;
    --accent-on-dark: #FF8A8E;
    --info: #1E88E5;
    --info-strong: #0D5DB0;
    --info-on-dark: #7FC4FF;

    --ink: #1B1638;
    --ink-2: #3C3C3C;
    --muted: #6E6A85;
    --muted-2: #9994AD;

    --line: #E5E2EE;
    --line-2: #EFECF5;
    --paper: #FAF8F2;
    --paper-2: #F5F0E8;
    --gray: #F1F1F1;
    --white: #FFFFFF;

    --serif: 'Newsreader', Georgia, serif;
    --sans: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'IBM Plex Mono', ui-monospace, monospace;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    font-family: var(--sans);
    background: var(--paper);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
  }
  ::selection { background: var(--accent); color: #FFFFFF; }
  p { text-wrap: pretty; }
  h1, h2, h3 { text-wrap: balance; }

  @keyframes jn-cue { 0% { transform: scaleY(0); transform-origin: top; } 45% { transform: scaleY(1); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }
  @keyframes jn-blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }

  [data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
  [data-reveal].in { opacity: 1; transform: translateY(0); }
  @media (prefers-reduced-motion: reduce) {
    [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
  }

  .wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
  .wrap-narrow { max-width: 760px; margin: 0 auto; }
  section, header.cover { padding: clamp(70px, 9vw, 120px) 28px; }

  .eyebrow {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    margin: 0 0 20px;
    display: block;
  }
  .eyebrow.on-dark { color: var(--accent-on-dark); }
  .eyebrow.on-light { color: var(--accent-deep); }

  .tiret {
    display: inline-block;
    width: 30px; height: 6px;
    border-radius: 3px;
    background: var(--accent);
    margin-right: 16px;
    transform: translateY(-6px);
    flex-shrink: 0;
  }
  .tiret.on-dark { background: var(--accent-on-dark); }

  .section-head { display: flex; align-items: baseline; gap: 22px; margin-bottom: 4px; }
  .section-num {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(40px, 4.4vw, 64px);
    line-height: 1;
    color: var(--muted-2);
    opacity: .5;
    flex-shrink: 0;
  }
  .section-num.on-dark { color: rgba(255,255,255,0.28); }

  h2.h-title {
    margin: 0;
    font-family: var(--sans);
    font-weight: 800;
    font-size: clamp(32px, 3.6vw, 50px);
    line-height: 1.05;
    letter-spacing: -0.02em;
  }
  .on-dark-title { color: #FFFFFF; }
  .on-light-title { color: var(--ink); }

  .lead { font-size: 19px; line-height: 1.68; }
  .lead.on-dark { color: rgba(255,255,255,0.85); }
  .lead.on-light { color: var(--ink-2); }

  em.mark { font-style: normal; }
  em.mark.on-dark { box-shadow: inset 0 -0.45em rgba(255,138,142,0.3); }
  em.mark.on-light { box-shadow: inset 0 -0.45em rgba(211,46,51,0.16); }

  #progress-track { position: fixed; top: 0; left: 0; right: 0; height: 4px; background: rgba(15,4,60,0.08); z-index: 90; }
  #progress-bar { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-deep)); transition: width .1s linear; }

  #floating-nav {
    position: fixed; right: 16px; top: 50%; transform: translateY(-50%); z-index: 80;
    display: none; flex-direction: column; align-items: flex-end; gap: 12px;
    padding: 14px 14px 16px 18px; border-radius: 10px;
    background: transparent; border: 1px solid transparent;
    transition: background .25s, border-color .25s, box-shadow .25s;
  }
  #floating-nav.is-visible { display: flex; }
  #floating-nav.is-hover { background: rgba(15,4,60,0.96); border-color: rgba(255,138,142,0.25); box-shadow: 0 12px 32px rgba(0,0,0,0.35); }
  .nav-head { display: flex; align-items: baseline; gap: 10px; }
  .nav-title { font-family: var(--mono); font-size: 10px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--accent-on-dark); opacity: 0; transition: opacity .25s; }
  #floating-nav.is-hover .nav-title { opacity: 1; }
  .nav-pct { font-family: var(--mono); font-size: 11px; color: #9994AD; }
  .nav-track { position: relative; display: flex; flex-direction: column; gap: 10px; align-items: stretch; }
  .nav-rail { position: absolute; right: 3px; top: 6px; bottom: 6px; width: 2px; background: rgba(153,148,173,0.35); }
  .nav-rail-fill { width: 100%; height: 0%; background: var(--accent); transition: height .15s linear; }
  .nav-item { display: flex; align-items: center; justify-content: flex-end; gap: 12px; text-decoration: none; }
  .nav-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: #9994AD; white-space: nowrap; opacity: 0; transition: opacity .25s, color .25s; }
  #floating-nav.is-hover .nav-label { opacity: 1; }
  .nav-item.active .nav-label { opacity: 1 !important; color: var(--accent-on-dark); }
  .nav-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(153,148,173,0.55); display: block; position: relative; z-index: 1; transition: transform .25s, background .25s; }
  .nav-item.active .nav-dot { background: var(--accent); transform: scale(1.5); }

  header.cover {
    position: relative; overflow: hidden; min-height: 94vh;
    display: flex; flex-direction: column;
    background: var(--brand-dark); color: #FFFFFF;
    padding-bottom: 0;
  }
  header.cover .grid-bg {
    position: absolute; inset: 0; pointer-events: none;
    background-image:
      linear-gradient(rgba(255,138,142,0.06) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,138,142,0.06) 1px, transparent 1px);
    background-size: 56px 56px;
  }
  .cover-topbar {
    position: relative; max-width: 1180px; width: 100%; margin: 0 auto;
    padding: 34px 28px 0; display: flex; align-items: center; justify-content: space-between;
    gap: 20px; flex-wrap: wrap;
  }
  .cover-brand { display: flex; align-items: center; gap: 14px; }
  .cover-brand img { height: 34px; display: block; }
  .cover-brand span { font-family: var(--mono); font-size: 13px; letter-spacing: 0.18em; color: var(--info-on-dark); text-transform: uppercase; }
  .cover-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em; color: rgba(255,255,255,0.5); text-transform: uppercase; }

  .cover-main {
    position: relative; flex: 1; display: flex; align-items: center;
    max-width: 1180px; width: 100%; margin: 0 auto;
    padding: 48px 28px; gap: 40px; flex-wrap: wrap;
  }
  .cover-copy { flex: 1.3 1 480px; min-width: 300px; }
  .cover-copy .eyebrow { color: var(--info-on-dark); margin-bottom: 26px; font-size: 13px; letter-spacing: 0.24em; }
  .cover-copy h1 {
    margin: 0; font-family: var(--sans); font-weight: 900;
    font-size: clamp(36px, 4.6vw, 62px); line-height: 1.02; letter-spacing: -0.03em; color: #FFFFFF;
  }
  .cover-copy h1 .hl { color: var(--accent-on-dark); }
  .cover-copy .dek { margin: 30px 0 0; font-family: var(--serif); font-style: italic; font-size: clamp(19px, 2.2vw, 25px); color: rgba(255,255,255,0.82); font-weight: 500; }
  .cover-copy .byline { margin: 40px 0 0; font-family: var(--mono); font-size: 13px; letter-spacing: 0.14em; color: rgba(255,255,255,0.45); }
  .cover-copy .authors { margin: 14px 0 0; font-family: var(--mono); font-size: 13px; letter-spacing: 0.04em; color: rgba(255,255,255,0.55); }
  .cover-copy .authors a { color: var(--info-on-dark); text-decoration: none; border-bottom: 1px solid rgba(127,196,245,0.35); }
  .cover-copy .authors a:hover { border-bottom-color: var(--info-on-dark); }

  .stack { flex: 1 1 340px; min-width: 300px; max-width: 460px; font-family: var(--mono); }
  .stack-card { border: 1px solid rgba(127,196,245,0.4); border-radius: 8px; background: rgba(27,15,82,0.85); box-shadow: 0 30px 80px rgba(0,0,0,0.4); overflow: hidden; }
  .stack-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid rgba(127,196,245,0.25); }
  .stack-dot { width: 10px; height: 10px; border-radius: 50%; display: block; }
  .stack-body { padding: 22px; display: grid; gap: 10px; }
  .stack-row { border: 1px solid rgba(127,196,245,0.28); border-radius: 6px; padding: 14px 16px; background: rgba(255,255,255,0.03); }
  .stack-row.key { border-color: rgba(255,138,142,0.55); background: rgba(255,138,142,0.08); }
  .stack-row .k { display: block; font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--info-on-dark); margin-bottom: 6px; }
  .stack-row.key .k { color: var(--accent-on-dark); }
  .stack-row .v { font-size: 13px; line-height: 1.5; color: rgba(255,255,255,0.78); }
  .stack-arrow { text-align: center; color: rgba(255,255,255,0.3); font-size: 13px; line-height: 1; }
  .stack-out { border-top: 1px dashed rgba(255,255,255,0.18); padding-top: 14px; margin-top: 4px; font-size: 12px; line-height: 1.6; color: #9994AD; }
  .stack-out b { color: #FFFFFF; font-weight: 600; }
  .caret { display: inline-block; width: 8px; height: 13px; background: var(--info-on-dark); vertical-align: -2px; margin-left: 6px; animation: jn-blink 1.1s steps(1) infinite; }

  .scroll-cue { position: relative; display: flex; flex-direction: column; align-items: center; gap: 12px; padding-bottom: 30px; }
  .scroll-cue span { font-family: var(--mono); font-size: 11px; letter-spacing: 0.28em; text-transform: uppercase; color: rgba(255,255,255,0.45); }
  .scroll-cue .cue-line { width: 1px; height: 52px; background: rgba(255,255,255,0.14); position: relative; overflow: hidden; }
  .scroll-cue .cue-line div { position: absolute; inset: 0; background: var(--accent); animation: jn-cue 2.2s ease-in-out infinite; }

  section.bg-paper { background: var(--paper); }
  section.bg-white { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  section.bg-paper2 { background: var(--paper-2); }
  section.bg-dark { background: var(--brand-dark); color: #FFFFFF; }

  .callout { margin: 44px 0 0; padding: 28px 32px; border-left: 3px solid var(--accent); background: rgba(211,46,51,0.045); }
  .callout.on-dark { background: rgba(255,138,142,0.06); border-left-color: var(--accent-on-dark); }
  .callout p.label { margin: 0 0 10px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.26em; text-transform: uppercase; color: var(--accent-deep); }
  .callout.on-dark p.label { color: var(--accent-on-dark); }
  .callout p.body { margin: 0; font-size: 19px; line-height: 1.62; }

  /* Trois couches */
  .layers-grid { margin: clamp(44px, 5vw, 64px) 0 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 16px; }
  .layer-card { border: 1px solid var(--line); border-top: 3px solid var(--info); border-radius: 8px; padding: 30px 32px; background: var(--white); }
  .layer-card.key { border-color: rgba(211,46,51,0.4); border-top-color: var(--accent); background: rgba(211,46,51,0.035); }
  .layer-card .role { margin: 0 0 14px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--info-strong); }
  .layer-card.key .role { color: var(--accent-deep); }
  .layer-card h3 { margin: 0 0 12px; font-family: var(--sans); font-weight: 800; font-size: 22px; line-height: 1.2; color: var(--ink); }
  .layer-card p { margin: 0; font-size: 16px; line-height: 1.6; color: var(--ink-2); }
  .chain { margin: 34px auto 0; max-width: 900px; background: var(--brand-dark-2); border-radius: 8px; padding: 22px 28px; font-family: var(--mono); font-size: clamp(12px, 1.5vw, 15px); line-height: 1.9; color: #FFFFFF; text-align: center; }
  .chain .c1 { color: var(--info-on-dark); }
  .chain .c2 { color: var(--accent-on-dark); }
  .chain .sep { color: rgba(255,255,255,0.35); padding: 0 6px; }

  /* Tâches */
  .task-list { margin-top: clamp(44px, 5vw, 64px); display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 12px; }
  .task { border: 1px solid rgba(255,255,255,0.16); border-left: 3px solid var(--info-on-dark); border-radius: 6px; padding: 22px 24px; background: rgba(255,255,255,0.03); }
  .task h3 { margin: 0 0 8px; font-family: var(--mono); font-size: 14px; letter-spacing: 0.04em; color: #FFFFFF; font-weight: 600; }
  .task p { margin: 0; font-size: 15px; line-height: 1.55; color: rgba(255,255,255,0.72); }
  .task p .gain { color: var(--accent-on-dark); }

  /* Flux AVANT / MAINTENANT */
  .flow { margin-top: 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); padding: 28px 30px 24px; }
  .flow:first-of-type { margin-top: clamp(44px, 5vw, 60px); }
  .flow-title { margin: 0 0 4px; font-family: var(--sans); font-weight: 800; font-size: 21px; color: var(--ink); }
  .flow-tools { margin: 0 0 22px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; color: var(--muted); }
  .flow-row { display: grid; grid-template-columns: 116px 1fr; gap: 18px; align-items: center; margin-bottom: 10px; }
  .flow-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); }
  .flow-label.now { color: var(--accent-deep); }
  .flow-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); gap: 8px; }
  .step { border-radius: 6px; padding: 13px 15px; font-size: 14px; line-height: 1.35; }
  .step.human { background: var(--gray); border: 1px solid var(--line); color: var(--ink-2); }
  .step.agent { background: var(--brand-dark); border: 1px solid var(--brand-dark); color: #FFFFFF; }
  .step .who { display: block; margin-top: 8px; font-family: var(--mono); font-size: 9px; letter-spacing: 0.18em; text-transform: uppercase; opacity: 0.62; }
  .flow-legend { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line-2); font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--muted); }
  .flow-legend span { display: inline-flex; align-items: center; gap: 8px; }
  .sw { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
  .sw.human { background: var(--gray); border: 1px solid var(--line); }
  .sw.agent { background: var(--brand-dark); }
  .flow-note { margin: 16px 0 0; font-family: var(--serif); font-style: italic; font-size: 16px; line-height: 1.6; color: var(--muted); }
  @media (max-width: 640px) {
    .flow-row { grid-template-columns: 1fr; gap: 8px; }
  }

  /* Comparatif 2 colonnes */
  .compare-grid { margin: clamp(44px, 5vw, 60px) 0 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
  .compare-card { border: 1px solid var(--line); border-radius: 8px; padding: 30px 32px; background: var(--white); position: relative; }
  .compare-card.chosen { border: 1px solid rgba(211,46,51,0.45); background: rgba(211,46,51,0.04); }
  .compare-card .badge { position: absolute; top: -11px; left: 24px; font-family: var(--mono); font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase; color: #FFFFFF; background: var(--accent-deep); padding: 4px 10px; border-radius: 3px; font-weight: 600; }
  .compare-card .name { margin: 0 0 20px; font-family: var(--mono); font-size: 13px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--muted); }
  .compare-card.chosen .name { color: var(--accent-deep); }
  .compare-card ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
  .compare-card li { display: flex; gap: 12px; font-size: 16px; line-height: 1.55; color: var(--ink-2); }
  .compare-card li::before { content: "—"; color: var(--muted-2); flex-shrink: 0; }
  .compare-card.chosen li::before { color: var(--accent); }

  /* Étapes de démarrage */
  .start-grid { margin-top: clamp(44px, 5vw, 60px); display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 14px; }
  .start-card { border: 1px solid var(--line); border-radius: 8px; padding: 28px 30px; background: var(--white); }
  .start-card .num { margin: 0 0 14px; font-family: var(--serif); font-weight: 400; font-size: 38px; line-height: 1; color: var(--accent); }
  .start-card h3 { margin: 0 0 12px; font-family: var(--sans); font-weight: 700; font-size: 19px; line-height: 1.25; color: var(--ink); }
  .start-card p { margin: 0; font-size: 16px; line-height: 1.6; color: var(--ink-2); }

  section.citation { background: var(--brand-dark); padding: clamp(80px, 10vw, 140px) 28px; }
  .citation-inner { max-width: 1020px; margin: 0 auto; text-align: center; }
  .citation-label { margin: 0 0 30px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.55); }
  .citation-quote { margin: 0; font-family: var(--serif); font-style: italic; font-weight: 500; font-size: clamp(26px, 3.6vw, 46px); line-height: 1.28; color: #FFFFFF; }
  .citation-quote em { font-style: italic; color: var(--accent-on-dark); box-shadow: inset 0 -0.35em rgba(255,138,142,0.25); }

  .about-asi { margin-top: 64px; padding-top: 44px; border-top: 1px solid rgba(255,255,255,0.14); }
  .about-asi .label { margin: 0 0 24px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--accent-on-dark); }
  .about-asi .claim { margin: 0 0 22px; font-family: var(--sans); font-weight: 800; font-size: 21px; line-height: 1.3; color: #FFFFFF; }
  .about-asi .kpis { display: flex; gap: 34px; margin-bottom: 24px; flex-wrap: wrap; }
  .about-asi .kpis .num { margin: 0; font-family: var(--serif); font-weight: 400; font-size: 36px; line-height: 1; color: var(--accent-on-dark); }
  .about-asi .kpis .desc { margin: 8px 0 0; font-size: 14px; color: rgba(255,255,255,0.6); }
  .about-asi p.body { margin: 18px 0 0; font-size: 17px; line-height: 1.65; color: rgba(255,255,255,0.8); }
  .about-asi .fall { margin: 18px 0 0; font-family: var(--sans); font-weight: 800; font-size: 18px; color: #FFFFFF; }

  .page-footer { margin-top: 56px; padding-top: 26px; border-top: 1px solid rgba(255,255,255,0.14); display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
  .page-footer p { margin: 0; font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: rgba(255,255,255,0.4); }

  @media (max-width: 1239px) { #floating-nav { display: none !important; } }