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

    :root {
      --ink:    #0e0e0e;
      --paper:  #f5f2ec;
      --accent: #b5342a;
      --muted:  #5a5650;
      --light:  #8a8480;
      --rule:   #d6d0c4;
      --serif:  'Cormorant Garamond', Georgia, serif;
      --mono:   'DM Mono', monospace;
    }

    html { scroll-behavior: smooth; }
    [id] { scroll-margin-top: 90px; }

    body {
      background: var(--paper);
      color: var(--ink);
      font-family: var(--serif);
      font-size: 20px;
      line-height: 1.75;
      overflow-x: hidden;
    }

    /* NAV */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      display: flex; justify-content: space-between; align-items: center;
      padding: 1.4rem 4rem;
      background: var(--paper);
      border-bottom: 1px solid var(--rule);
      transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .nav-hidden { transform: translateY(-100%); }
    .nav-logo { font-family: var(--mono); font-size: .75rem; letter-spacing: .18em; text-transform: uppercase; color: var(--ink); font-weight: 400; }
    .nav-links { display: flex; gap: 2.5rem; list-style: none; }
    .nav-links a { font-family: var(--mono); font-size: .65rem; letter-spacing: .14em; text-transform: uppercase; text-decoration: none; color: var(--muted); transition: color .2s; }
    .nav-links a:hover { color: var(--accent); }

    /* HERO */
    #hero {
      min-height: 100vh; padding-top: 80px;
      display: flex; flex-direction: column; justify-content: center; align-items: center;
      padding: 8rem 4rem 0;
      border-bottom: 1px solid var(--rule);
      background: #edeae2;
      text-align: center;
    }
    .hero-label { font-family: var(--mono); font-size: .65rem; letter-spacing: .22em; text-transform: uppercase; color: var(--accent); margin-bottom: 3rem; text-align: center; }
    .hero-title { font-size: clamp(3.2rem, 6vw, 6.5rem); font-weight: 300; line-height: 1.1; letter-spacing: -.01em; max-width: 22ch; color: var(--ink); margin-bottom: 2rem; text-align: center; margin-left: auto; margin-right: auto; }
    .hero-title em { font-style: italic; color: var(--accent); font-weight: 300; }
    .hero-title strong { font-weight: 300; font-style: italic; color: var(--accent); }
    .hero-bridge {
      font-size: 1.25rem; font-weight: 400; color: var(--ink);
      max-width: 62ch; line-height: 1.85; margin-bottom: 5rem;
      border-left: none; padding-left: 0;
      text-align: center; margin-left: auto; margin-right: auto;
      font-style: italic;
    }
    .hero-pillars { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--rule); width: 100%; max-width: 1100px; margin-top: 4rem; }
    .pillar { padding: 2.5rem 2.5rem 2.5rem 0; border-right: 1px solid var(--rule); }
    .pillar:last-child { border-right: none; padding-left: 2.5rem; }
    .pillar:nth-child(2) { padding-left: 2.5rem; }
    .pillar-num { font-family: var(--mono); font-size: .58rem; letter-spacing: .2em; color: var(--muted); margin-bottom: .5rem; }
    .pillar-title { font-size: 1.1rem; font-weight: 400; color: var(--ink); margin-bottom: .8rem; font-style: normal; }
    .pillar-text { font-size: 1.05rem; font-weight: 400; font-style: italic; line-height: 1.6; color: var(--ink); }

    /* SECTIONS */
    .section-wrap { padding: 8rem 4rem; max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; align-items: flex-start; }
    .section-label { font-family: var(--mono); font-size: .85rem; letter-spacing: .22em; text-transform: uppercase; color: var(--accent); margin-bottom: 3.5rem; display: flex; align-items: center; gap: 1rem; }
    .section-label::after { content: ''; display: block; height: 1px; width: 2.5rem; background: var(--accent); }

    .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 6rem; align-items: start; }
    .headline-lg { font-size: clamp(2.2rem, 3.5vw, 3.4rem); font-weight: 300; line-height: 1.2; color: var(--ink); }
    .headline-lg strong { font-weight: 600; }
    .body-text { font-size: 1.25rem; font-weight: 300; color: var(--ink); line-height: 2; max-width: 60ch; width: 100%; text-align: left; }
    .body-text p + p { margin-bottom: 1.6rem; }

    /* PROBLÈME */
    #probleme { border-top: 1px solid var(--rule); }

    /* MÉCANISME */
    #mecanisme { background: var(--paper); color: var(--ink); border-top: 1px solid var(--rule); }
    #mecanisme .section-wrap { max-width: 1200px; padding: 8rem 4rem; }
    #mecanisme .section-label { color: var(--accent); }
    #mecanisme .section-label::after { background: var(--accent); }
    .mec-inner { width: 100%; }
    .mec-headline { font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 300; line-height: 1.25; margin-bottom: 5rem; max-width: 58ch; color: var(--ink); }
    .mec-headline em { font-style: italic; color: #c97a74; }
    .mec-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--rule); }
    .mcard { background: var(--paper); padding: 3rem 2.5rem; border: 1px solid var(--rule); transition: background .2s; }
    .mcard:hover { background: #edeae2; }
    .mcard-tag { font-family: var(--mono); font-size: .8rem; letter-spacing: .18em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.5rem; }
    .mcard-title { font-size: 1.7rem; font-weight: 400; margin-top: .5rem; margin-bottom: 1.4rem; line-height: 1.3; color: var(--ink); }
    .mcard-body { font-size: 1.25rem; font-weight: 300; color: var(--ink); line-height: 1.85; }

    /* MESURE */
    #mesure { border-top: 1px solid var(--rule); }
    .mesure-intro { font-size: 1.25rem; font-weight: 300; color: var(--ink); max-width: 60ch; line-height: 2; margin-bottom: 4rem; }
    .indicators { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
    .indicator { background: var(--paper); padding: 3rem; transition: background .2s; }
    .indicator:hover { background: #edeae2; }
    .indicator-num { font-family: var(--mono); font-size: 2.5rem; font-weight: 300; color: var(--accent); line-height: 1; margin-bottom: 1.5rem; }
    .indicator-title { font-size: 1.7rem; font-weight: 400; color: var(--ink); margin-top: .5rem; margin-bottom: 1.2rem; line-height: 1.3; }
    .indicator-body { font-size: 1.25rem; font-weight: 300; color: var(--ink); line-height: 1.95; }
    .indicator-signal { display: inline-block; margin-top: 1.5rem; font-family: var(--mono); font-size: .75rem; letter-spacing: .15em; text-transform: uppercase; color: var(--accent); border-bottom: 1px solid var(--accent); padding-bottom: .15rem; }
    .mesure-conclusion { margin-top: 3rem; font-size: 1.1rem; font-style: italic; font-weight: 300; color: var(--muted); max-width: 70ch; line-height: 1.85; border-left: 2px solid var(--accent); padding-left: 1.5rem; }

    /* RESPONSABILITÉ */
    #responsabilite { border-top: 1px solid var(--rule); }
    .resp-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--rule); margin-top: 2rem; }
    .resp-col { padding: 4rem 3.5rem; }
    .resp-col:first-child { border-right: 1px solid var(--rule); }
    .resp-role { font-family: var(--mono); font-size: .6rem; letter-spacing: .2em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.5rem; }
    .resp-title { font-size: 2rem; font-weight: 300; line-height: 1.2; margin-bottom: 1.5rem; color: var(--ink); }
    .resp-body { font-size: 1.25rem; font-weight: 300; color: var(--ink); line-height: 2; }
    .resp-verdict { display: inline-block; margin-top: 2rem; font-family: var(--mono); font-size: .62rem; letter-spacing: .15em; text-transform: uppercase; color: var(--accent); border-bottom: 1px solid var(--accent); padding-bottom: .2rem; }

    /* HISTOIRE */
    #histoire { border-top: 1px solid var(--rule); }
    .histoire-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 4rem; align-items: start; max-width: 1000px; }
    .histoire-left { position: sticky; top: 8rem; }
    .histoire-name { font-size: 2.2rem; font-weight: 300; line-height: 1.15; margin-top: 1rem; margin-bottom: 1.5rem; color: var(--ink); }
    .histoire-name em { font-style: italic; color: var(--accent); }
    .histoire-meta { font-family: var(--mono); font-size: .62rem; letter-spacing: .12em; text-transform: uppercase; color: var(--light); line-height: 2.2; }
    .histoire-body { font-size: 1.25rem; font-weight: 300; line-height: 2.05; color: var(--ink); max-width: 60ch; width: 100%; text-align: left; }
    .histoire-body p + p { margin-bottom: 2rem; }
    .pull-quote { margin: 3rem 0; padding: 2rem 2.5rem; border-left: 3px solid var(--accent); background: rgba(181,52,42,.04); font-size: 1.35rem; font-style: italic; font-weight: 400; line-height: 1.7; color: var(--ink); }

    /* STADES */
    #stades { background: #eeebe3; border-top: 1px solid var(--rule); }
    #stades .section-wrap { max-width: 100%; padding: 8rem 4rem; }
    .stades-inner { max-width: 1400px; margin: 0 auto; }
    .stades-headline { font-size: clamp(1.6rem, 2.5vw, 2.3rem); font-weight: 300; margin-bottom: 4rem; max-width: 60ch; line-height: 1.3; color: var(--ink); }
    .stages { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
    .stage { background: #eeebe3; padding: 2.5rem 2rem; transition: background .2s; }
    .stage:hover { background: var(--paper); }
    .stage-num { font-family: var(--mono); font-size: 1.8rem; font-weight: 300; margin-bottom: 1rem; line-height: 1; }
    .stage-name { font-family: var(--mono); font-size: .78rem; letter-spacing: .15em; text-transform: uppercase; color: var(--accent); margin-bottom: 1rem; }
    .stage-quote { font-size: 1rem; font-style: italic; color: var(--ink); margin-bottom: .8rem; line-height: 1.5; }
    .stage-desc { font-size: 1rem; font-weight: 300; color: var(--ink); line-height: 1.75; }

    /* INVITATION */
    #invitation { border-top: 1px solid var(--rule); text-align: center; display: flex; flex-direction: column; align-items: center; }
    .invitation-eyebrow { font-family: var(--mono); font-size: .62rem; letter-spacing: .22em; text-transform: uppercase; color: var(--light); margin-bottom: 2rem; }
    .invitation-title { font-size: clamp(2.2rem, 4vw, 3.8rem); font-weight: 300; line-height: 1.15; max-width: 24ch; margin: 0 auto 2rem; color: var(--ink); }
    .invitation-title em { font-style: italic; color: var(--accent); }
    .invitation-sub { font-size: 1.25rem; font-weight: 300; color: var(--ink); max-width: 60ch; margin: 0 auto 3.5rem; line-height: 2; }
    .btn { display: inline-block; font-family: var(--mono); font-size: .65rem; letter-spacing: .2em; text-transform: uppercase; text-decoration: none; color: var(--paper); background: var(--ink); padding: 1.2rem 3rem; border: 1px solid var(--ink); transition: background .25s, color .25s; }
    .btn:hover { background: var(--accent); color: var(--paper); border-color: var(--accent); }
    .cta-row { display: flex; align-items: center; gap: 1.5rem; justify-content: center; flex-wrap: wrap; }
    .linkedin-link { display: inline-flex; align-items: center; gap: .6rem; font-family: var(--mono); font-size: .68rem; letter-spacing: .15em; text-transform: uppercase; text-decoration: none; color: var(--ink); border: 1px solid var(--ink); padding: 1.2rem 2rem; transition: color .2s, border-color .2s; }
    .linkedin-link:hover { color: var(--accent); border-color: var(--accent); }
    .phone-link { display: inline-flex; align-items: center; gap: .6rem; margin-top: 1.5rem; font-family: var(--mono); font-size: .8rem; letter-spacing: .15em; color: var(--muted); text-decoration: none; transition: color .2s; }
    .phone-link:hover { color: var(--accent); }

    /* FOOTER */
    footer { border-top: 1px solid var(--rule); padding: 2.5rem 4rem; display: flex; justify-content: space-between; align-items: center; }
    .footer-copy { font-family: var(--mono); font-size: .58rem; letter-spacing: .12em; text-transform: uppercase; color: var(--light); }

    /* REVEAL */
    .reveal { opacity: 0; transform: translateY(20px); transition: opacity .75s ease, transform .75s ease; }
    .reveal.visible { opacity: 1; transform: none; }

    /* RESPONSIVE */
    @media (max-width: 960px) {
      nav { padding: 1.2rem 2rem; }
      .nav-links { display: none; }
      #hero { padding: 7rem 2rem 0; }
      .hero-pillars { grid-template-columns: 1fr; }
      .pillar, .pillar:nth-child(2), .pillar:last-child { padding: 2rem 0; border-right: none; border-top: 1px solid var(--rule); }
      .section-wrap { padding: 5rem 2rem; }
      .two-col, .histoire-grid, .resp-grid, .indicators { grid-template-columns: 1fr; }
      .resp-col:first-child { border-right: none; border-bottom: 1px solid var(--rule); }
      .histoire-left { position: static; }
      .mec-cards, .stages { grid-template-columns: 1fr; }
      #mecanisme .section-wrap, #stades .section-wrap { padding: 5rem 2rem; }
      footer { flex-direction: column; gap: 1rem; }
    }

    @media (min-width: 1600px) {
      .body-text, .histoire-body {
        font-size: 1.4rem;
        max-width: 68ch;
      }
    }
    @media (max-width: 1024px) {
      .section-wrap { padding: 5rem 1.5rem; }
      .hero-title { font-size: clamp(2.5rem, 8vw, 4rem); }
    }
    @media (max-width: 600px) {
      body { font-size: 18px; }
      .hero-bridge { text-align: left; padding-left: 1rem; border-left: 2px solid var(--accent); }
    }

    /* Hero schema */
    .hero-schema { width: 100%; max-width: 1100px; padding: 2.5rem 0 3rem; border-top: 1px solid var(--rule); margin-top: 0; }
    .schema-row { display: flex; align-items: center; justify-content: center; gap: 3rem; flex-wrap: wrap; }
    .schema-item { display: flex; align-items: center; gap: 1rem; }
    .schema-cause { font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
    .schema-effect { font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink); font-weight: 400; }
    .schema-arrow { color: var(--accent); flex-shrink: 0; }
    .schema-separator { width: 1px; height: 2rem; background: var(--rule); }
    /* Histoire verdict */
    .histoire-verdict { font-size: 1.3rem; font-style: italic; font-weight: 400; color: var(--accent); margin: 4rem 0; padding: 2rem 2rem; border-left: 3px solid var(--accent); background: rgba(181,52,42,.04); line-height: 1.7; }

    .resp-col-receiver { background: #f0ece4; }
    .resp-icon { color: var(--accent); margin-bottom: 1rem; }
    .resp-function { font-family: var(--mono); font-size: .62rem; letter-spacing: .25em; text-transform: uppercase; color: var(--accent); margin-bottom: .5rem; font-weight: 400; }

    .tooltip-trigger { position: relative; cursor: help; border-bottom: 1px dashed var(--accent); }
    .tooltip-box { display: none; position: absolute; bottom: 130%; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--paper); font-size: .8rem; font-style: normal; font-weight: 300; line-height: 1.6; padding: 1rem 1.2rem; width: 280px; border-radius: 2px; z-index: 200; pointer-events: none; letter-spacing: 0; }
    .tooltip-trigger:hover .tooltip-box, .tooltip-trigger.tooltip-active .tooltip-box { display: block; }
    .tooltip-box::after { content: ""; position: absolute; top: 100%; left: 50%; transform: translateX(-50%); border: 6px solid transparent; border-top-color: var(--ink); }