:root {
    color-scheme: light;
    --white: #FFFFFF;
    --grey: #EFEFEF;
    --ink: #0F1011;
    --blue: #3800F0;
    --muted: #646D76;
    --rule: #0F1011;
    --display: "Poppins", "Helvetica Neue", Arial, sans-serif;
    --body: "Geist", -apple-system, "Segoe UI", Arial, sans-serif;
    --wrap: 1080px;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--white);
    color: var(--ink);
    font-family: var(--body);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  h1, h2, h3, p, ul { margin: 0; }
  ul { padding: 0; list-style: none; }
  a { color: inherit; }
  :focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

  .wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 20px; }
  section { padding-block: clamp(48px, 8vw, 96px); }
  .grey { background: var(--grey); }

  /* type */
  .display {
    font-family: var(--display);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -0.02em;
    text-wrap: balance;
  }
  .h2 { font-size: clamp(1.9rem, 4.4vw, 2.75rem); }
  .kicker { font-size: 0.82rem; color: var(--muted); }
  .lead { font-size: clamp(1.02rem, 1.5vw, 1.15rem); max-width: 56ch; }
  .muted { color: var(--muted); }
  .blue { color: var(--blue); }

  /* buttons */
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 12px;
    padding: 16px 26px;
    font: 500 1rem/1 var(--body);
    text-decoration: none;
    border: 2px solid var(--ink); border-radius: 0;
    transition: background .15s ease, color .15s ease;
  }
  .btn svg { width: 18px; height: 18px; flex: none; }
  .btn-dark { background: var(--ink); color: var(--white); }
  .btn-dark:hover { background: var(--blue); border-color: var(--blue); }
  .btn-line { background: transparent; color: var(--ink); }
  .btn-line:hover { background: var(--ink); color: var(--white); }

  /* hero */
  .hero { background: var(--grey); padding-block: 40px clamp(48px, 8vw, 88px); }
  .hero h1 { font-size: clamp(2.6rem, 7.4vw, 5.4rem); margin-block: 40px 24px; max-width: 14ch; }
  .hero h1 span { color: var(--blue); display: block; }
  .hero .lead { margin-bottom: 32px; }
  .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

  /* signature band */
  .band {
    background: var(--blue); color: var(--white);
    padding-block: clamp(28px, 5vw, 48px);
  }
  .band a { display: flex; align-items: center; justify-content: space-between; gap: 24px; text-decoration: none; }
  .band .display { font-size: clamp(2.8rem, 10.5vw, 7.4rem); line-height: 0.98; letter-spacing: -0.035em; }
  .band svg { width: clamp(36px, 6vw, 64px); height: clamp(36px, 6vw, 64px); flex: none; }

  /* facts */
  .facts { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 28px 48px; }
  .facts .display { font-size: clamp(1.4rem, 2.6vw, 1.9rem); max-width: 14ch; }
  .facts ul { display: flex; flex-wrap: wrap; gap: 24px 48px; }
  .facts li { text-align: center; }
  .facts .big { display: block; font-family: var(--display); font-weight: 700; font-size: clamp(2.4rem, 5.5vw, 3.6rem); line-height: 1; color: var(--blue); letter-spacing: -0.03em; }
  .facts .lbl { font-size: 0.85rem; color: var(--ink); }

  /* problem */
  .split { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(28px, 6vw, 80px); align-items: start; }
  .rows li { padding-block: 22px; border-top: 2px solid var(--rule); }
  .rows li:last-child { border-bottom: 2px solid var(--rule); }
  .rows strong { display: block; font-family: var(--display); font-weight: 600; font-size: 1.1rem; line-height: 1.3; margin-bottom: 4px; }
  .rows p { color: var(--muted); font-size: 0.97rem; }
  .pivot { margin-top: 24px; max-width: 42ch; }

  /* reasoning diagram */
  .flow-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(28px, 6vw, 80px); align-items: center; }
  .flow { background: var(--white); border-bottom: 3px solid var(--blue); padding: clamp(20px, 3vw, 32px); }
  .flow-title { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 20px; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); font-weight: 500; }
  .node {
    display: block; padding: 12px 12px;
    border: 2px solid var(--ink);
    font-family: var(--display); font-weight: 600; font-size: 0.86rem; line-height: 1.25; text-align: center;
  }
  .node.root { background: var(--blue); border-color: var(--blue); color: var(--white); font-size: 0.98rem; }
  .node.act { background: var(--ink); color: var(--white); }
  .row { display: grid; gap: 8px; }
  .row.r3 { grid-template-columns: repeat(3, 1fr); }
  .row.r4 { grid-template-columns: repeat(2, 1fr); }
  .ask { display: flex; align-items: center; gap: 12px; padding-block: 14px; font-weight: 500; font-size: 0.9rem; color: var(--blue); }
  .ask::before { content: ""; width: 2px; height: 26px; background: var(--blue); flex: none; margin-left: 18px; }
  .flow-foot { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--grey); font-size: 0.85rem; color: var(--muted); }

  /* contenu */
  .cases { display: flex; flex-wrap: wrap; gap: 8px; margin-block: 24px 36px; }
  .cases li { background: var(--white); border-bottom: 3px solid var(--blue); padding: 9px 14px; font-weight: 500; font-size: 0.92rem; }
  .decisions li { display: grid; grid-template-columns: 56px 1fr; gap: 4px 12px; padding-block: 22px; border-top: 2px solid var(--rule); align-items: baseline; }
  .decisions li:last-child { border-bottom: 2px solid var(--rule); }
  .decisions .n { font-family: var(--display); font-weight: 600; font-size: 2rem; line-height: 1; letter-spacing: -0.03em; }
  .decisions .q { font-family: var(--display); font-weight: 600; font-size: clamp(1.1rem, 2.2vw, 1.35rem); line-height: 1.3; }
  .decisions .a { grid-column: 2; color: var(--muted); font-size: 0.95rem; }

  .decisions .core { display: inline-block; margin-left: 10px; padding: 3px 9px; background: var(--blue); color: var(--white); font: 500 0.72rem/1.4 var(--body); letter-spacing: 0.06em; text-transform: uppercase; font-style: normal; vertical-align: middle; }

  /* formateur */
  .stats li { display: grid; grid-template-columns: minmax(96px, 150px) 1fr; gap: 16px; align-items: center; padding-block: 18px; border-top: 2px solid var(--rule); }
  .stats li:last-child { border-bottom: 2px solid var(--rule); }
  .stats .big { font-family: var(--display); font-weight: 700; font-size: clamp(2rem, 4.5vw, 2.9rem); line-height: 1; color: var(--blue); letter-spacing: -0.03em; }
  .stats .lbl { font-size: 0.92rem; }
  .quotes { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 5vw, 64px); margin-top: clamp(40px, 6vw, 72px); }
  .quote { margin: 0; padding: 28px 0 0; border-top: 2px solid var(--rule); }
  .quote blockquote { margin: 0; font-family: var(--display); font-weight: 600; font-size: clamp(1.25rem, 2.6vw, 1.75rem); line-height: 1.35; letter-spacing: -0.01em; text-wrap: pretty; }
  .quote figcaption { margin-top: 16px; font-size: 0.9rem; color: var(--muted); }

  /* fit */
  .fit { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 5vw, 64px); margin-top: 36px; }
  .fit h3 { font-family: var(--display); font-weight: 700; font-size: 1.25rem; letter-spacing: -0.01em; margin-bottom: 14px; }
  .fit li { display: grid; grid-template-columns: 24px 1fr; gap: 12px; padding-block: 13px; border-top: 2px solid var(--rule); }
  .fit li svg { width: 20px; height: 20px; margin-top: 3px; }
  .fit .yes svg { color: var(--blue); }
  .fit .no svg, .fit .no li { color: var(--muted); }

  /* choices */
  .choices { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 36px; align-items: stretch; }
  .card { background: var(--white); border-bottom: 3px solid var(--blue); padding: clamp(22px, 3.5vw, 40px); display: flex; flex-direction: column; gap: 6px; }
  .card .tag { font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); font-weight: 500; }
  .card h3 { font-family: var(--display); font-weight: 700; font-size: clamp(1.6rem, 3vw, 2.1rem); letter-spacing: -0.02em; line-height: 1.1; }
  .card .meta { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }
  .price { font-family: var(--display); font-weight: 700; font-size: clamp(3.4rem, 8vw, 5rem); line-height: 1; color: var(--blue); letter-spacing: -0.04em; margin-block: 14px 0; font-variant-numeric: tabular-nums; white-space: nowrap; }
  .price small { font-size: 0.9rem; letter-spacing: 0; color: var(--muted); font-weight: 500; margin-left: 8px; font-family: var(--body); }
  .inc { margin-block: 12px 4px; }
  .inc li { display: grid; grid-template-columns: 24px 1fr; gap: 10px; padding-block: 10px; border-top: 1px solid var(--grey); font-size: 0.96rem; }
  .inc svg { width: 20px; height: 20px; color: var(--blue); margin-top: 2px; }
  .info { display: grid; grid-template-columns: 24px 1fr; gap: 12px; padding: 14px; background: var(--grey); font-size: 0.9rem; margin-block: 10px 6px; }
  .info svg { width: 22px; height: 22px; color: var(--blue); }
  .card .btn { margin-top: auto; align-self: flex-start; }
  .card.solo { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 5vw, 64px); }
  .card.solo > div { display: flex; flex-direction: column; gap: 6px; }
  .card.solo .inc { margin-top: 0; }
  .card.solo .btn { margin-top: 20px; white-space: nowrap; }
  .price small { white-space: normal; }
  .topbar { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px 20px; padding: 20px; background: var(--ink); color: var(--white); text-decoration: none; text-align: center; }
  .topbar .tb-title { font-family: var(--display); font-weight: 700; font-size: clamp(1.1rem, 2.4vw, 1.45rem); letter-spacing: -0.01em; }
  .topbar .tb-meta { padding: 5px 12px; background: var(--blue); font-weight: 600; font-size: 0.95rem; }
  .topbar strong { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 1.05rem; }
  .topbar svg { width: 20px; height: 20px; }
  .topbar:hover strong { text-decoration: underline; text-underline-offset: 4px; }
  .card .spacer { flex: 1; min-height: 16px; }
  .dm { font-size: 0.85rem; color: var(--muted); margin-top: 12px; }
  .card p.desc { margin-block: 12px 4px; }

  /* appel d'info */
  .call {
    display: flex; align-items: center; justify-content: space-between; gap: 16px 24px; flex-wrap: wrap;
    margin-top: 16px; padding: 22px clamp(22px, 3.5vw, 40px);
    background: var(--white); border-bottom: 3px solid var(--blue);
    text-decoration: none;
  }
  .call h3 { font-family: var(--display); font-weight: 700; font-size: 1.25rem; letter-spacing: -0.01em; line-height: 1.2; }
  .call p { color: var(--muted); font-size: 0.95rem; margin-top: 2px; }
  .call .go { display: inline-flex; align-items: center; gap: 10px; font-weight: 500; white-space: nowrap; }
  .call .go svg { width: 20px; height: 20px; }
  .call:hover .go { color: var(--blue); }

  /* faq */
  .faq { max-width: 860px; margin-top: 28px; counter-reset: q; }
  .faq details { border-top: 2px solid var(--rule); counter-increment: q; }
  .faq details:last-child { border-bottom: 2px solid var(--rule); }
  .faq summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: 56px 1fr 24px; align-items: baseline; gap: 12px; padding-block: 20px; font-family: var(--display); font-weight: 600; font-size: 1.05rem; line-height: 1.35; }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::before { content: counter(q); font-size: 2rem; font-weight: 600; line-height: 1; letter-spacing: -0.03em; }
  .faq summary::after { content: "+"; font-size: 1.5rem; line-height: 1; justify-self: end; }
  .faq details[open] summary::after { content: "–"; }
  .faq details p { padding: 0 36px 22px 68px; color: var(--muted); max-width: 64ch; }

  /* final */
  .final { text-align: left; }
  .final .display { font-size: clamp(2rem, 5vw, 3.4rem); max-width: 16ch; }
  .final .hero-actions { margin-top: 28px; }

  footer { padding-block: 28px; border-top: 2px solid var(--ink); }
  footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; font-size: 0.85rem; color: var(--muted); }

  @media (max-width: 860px) {
    .split, .flow-wrap, .fit, .choices, .quotes, .card.solo { grid-template-columns: 1fr; }
    .facts ul { width: 100%; justify-content: space-between; gap: 20px; }
    .facts li { text-align: left; }
  }
  @media (max-width: 460px) {
    .btn { width: 100%; }
    .card .btn { align-self: stretch; }
    .row.r3 { grid-template-columns: 1fr; }
    .faq summary { grid-template-columns: 36px 1fr 20px; }
    .faq details p { padding-left: 48px; padding-right: 0; }
    .decisions li { grid-template-columns: 40px 1fr; }
    .stats li { grid-template-columns: 1fr; gap: 4px; }
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .btn { transition: none; }
  }