:root {
      --bg: #07111f;
      --bg2: #0b1d33;
      --card: rgba(255,255,255,0.075);
      --line: rgba(120,190,255,0.28);
      --text: #f4f8ff;
      --muted: #b7c7dd;
      --blue: #40b8ff;
      --violet: #9c6bff;
      --orange: #ff9d3d;
      --green: #4dffbd;
      --shadow: 0 24px 80px rgba(0,0,0,.36);
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at top left, rgba(64,184,255,.22), transparent 34%),
        radial-gradient(circle at bottom right, rgba(156,107,255,.22), transparent 34%),
        linear-gradient(135deg, var(--bg), var(--bg2));
      min-height: 100vh;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
      background-size: 44px 44px;
      mask-image: linear-gradient(to bottom, rgba(0,0,0,.85), transparent 92%);
    }

    a { color: inherit; text-decoration: none; }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(18px);
      background: rgba(5,13,24,.72);
      border-bottom: 1px solid var(--line);
    }

    .nav {
      max-width: 1180px;
      margin: auto;
      padding: 16px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: flex;
      flex-direction: column;
      line-height: 1.1;
      font-weight: 800;
      letter-spacing: .6px;
    }

    .brand span:last-child {
      color: var(--muted);
      font-size: 12px;
      font-weight: 500;
      margin-top: 4px;
    }

    .navlinks {
      display: flex;
      flex-wrap: wrap;
      justify-content: flex-end;
      gap: 10px;
      font-size: 13px;
      color: var(--muted);
    }

    .navlinks a {
      border: 1px solid rgba(255,255,255,.12);
      border-radius: 999px;
      padding: 8px 12px;
      background: rgba(255,255,255,.04);
    }

    .navlinks a:hover { border-color: var(--blue); color: white; }

    .container {
      max-width: 1180px;
      margin: auto;
      padding: 58px 22px 34px;
      position: relative;
    }

    .hero {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 28px;
      align-items: stretch;
    }

    .panel {
      border: 1px solid var(--line);
      background: linear-gradient(145deg, rgba(255,255,255,.10), rgba(255,255,255,.045));
      box-shadow: var(--shadow);
      border-radius: 30px;
      padding: 32px;
      position: relative;
      overflow: hidden;
    }

    .panel::after {
      content: "";
      position: absolute;
      width: 220px;
      height: 220px;
      right: -80px;
      top: -80px;
      background: radial-gradient(circle, rgba(64,184,255,.30), transparent 70%);
    }

    .badge {
      display: inline-flex;
      gap: 8px;
      align-items: center;
      border: 1px solid rgba(64,184,255,.42);
      background: rgba(64,184,255,.10);
      color: #dff4ff;
      padding: 9px 14px;
      border-radius: 999px;
      font-size: 13px;
      margin-bottom: 22px;
    }

    h1 {
      font-size: clamp(38px, 7vw, 78px);
      line-height: .92;
      margin: 0 0 22px;
      letter-spacing: -2px;
    }

    .gradient {
      background: linear-gradient(90deg, var(--blue), var(--violet), var(--orange));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    .lead {
      color: var(--muted);
      font-size: 18px;
      line-height: 1.65;
      max-width: 780px;
      margin: 0 0 26px;
    }

    .cta-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 16px;
      padding: 13px 18px;
      font-weight: 700;
      border: 1px solid rgba(255,255,255,.16);
      background: rgba(255,255,255,.08);
      transition: .2s ease;
    }

    .btn.primary {
      background: linear-gradient(135deg, rgba(64,184,255,.95), rgba(156,107,255,.95));
      color: #06101d;
      border: none;
    }

    .btn:hover { transform: translateY(-2px); }

    .radar {
      min-height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 22px;
    }

    .orb {
      aspect-ratio: 1/1;
      width: min(100%, 360px);
      margin: auto;
      border-radius: 50%;
      border: 1px solid rgba(64,184,255,.36);
      background:
        radial-gradient(circle, rgba(77,255,189,.22) 0 5%, transparent 6%),
        repeating-radial-gradient(circle, rgba(64,184,255,.12) 0 2px, transparent 2px 46px),
        conic-gradient(from 120deg, transparent, rgba(64,184,255,.38), transparent, rgba(156,107,255,.32), transparent);
      box-shadow: inset 0 0 60px rgba(64,184,255,.12), 0 0 80px rgba(64,184,255,.16);
      position: relative;
      animation: pulse 5s ease-in-out infinite;
    }

    .orb::before, .orb::after {
      content: "";
      position: absolute;
      inset: 16%;
      border-radius: 50%;
      border: 1px dashed rgba(255,255,255,.24);
    }

    .orb::after {
      inset: 32%;
      border-color: rgba(255,157,61,.36);
    }

    @keyframes pulse {
      0%,100% { transform: scale(1); filter: brightness(1); }
      50% { transform: scale(1.02); filter: brightness(1.18); }
    }

    .metrics {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .metric {
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,.06);
      border: 1px solid rgba(255,255,255,.10);
      text-align: center;
    }

    .metric strong { display: block; font-size: 22px; color: var(--green); }
    .metric span { font-size: 11px; color: var(--muted); }

    .section-title {
      margin: 52px 0 20px;
      display: flex;
      justify-content: space-between;
      gap: 18px;
      align-items: end;
    }

    .section-title h2 {
      margin: 0;
      font-size: clamp(28px, 4vw, 44px);
      letter-spacing: -1px;
    }

    .section-title p {
      margin: 0;
      color: var(--muted);
      max-width: 480px;
      line-height: 1.55;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }

    .card {
      border: 1px solid rgba(255,255,255,.13);
      background: var(--card);
      border-radius: 24px;
      padding: 22px;
      min-height: 215px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: .22s ease;
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at top right, rgba(64,184,255,.18), transparent 45%);
      opacity: .65;
    }

    .card:hover {
      transform: translateY(-5px);
      border-color: rgba(64,184,255,.55);
      background: rgba(255,255,255,.095);
    }

    .card > * { position: relative; z-index: 1; }

    .kicker {
      color: var(--orange);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 1.4px;
      text-transform: uppercase;
    }

    .card h3 {
      margin: 12px 0 10px;
      font-size: 23px;
    }

    .card p {
      color: var(--muted);
      line-height: 1.55;
      margin: 0 0 18px;
    }

    .mini-link {
      color: #dff4ff;
      font-weight: 700;
      font-size: 14px;
    }

    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: 18px;
    }

    .step {
      padding: 18px;
      border-radius: 20px;
      background: rgba(255,255,255,.055);
      border: 1px solid rgba(255,255,255,.11);
    }

    .step strong { color: var(--blue); display: block; margin-bottom: 8px; }
    .step span { color: var(--muted); font-size: 14px; line-height: 1.45; }

    footer {
      margin-top: 54px;
      padding: 28px 0 12px;
      border-top: 1px solid var(--line);
      color: var(--muted);
      display: flex;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
      font-size: 14px;
    }

    @media (max-width: 900px) {
      .hero { grid-template-columns: 1fr; }
      .grid { grid-template-columns: 1fr 1fr; }
      .timeline { grid-template-columns: 1fr 1fr; }
      .section-title { align-items: start; flex-direction: column; }
      .nav { align-items: flex-start; flex-direction: column; }
      .navlinks { justify-content: flex-start; }
    }

    @media (max-width: 620px) {
      .container { padding-top: 34px; }
      .panel { padding: 24px; border-radius: 24px; }
      .grid, .timeline, .metrics { grid-template-columns: 1fr; }
      h1 { letter-spacing: -1px; }
      .lead { font-size: 16px; }
    }

    /* RETOUR HAUT */

#backToTop {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 52px;
  height: 52px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, #061426, #0f4c81);
  color: white;
  font-size: 1.4rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(6,20,38,0.28);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 9999;
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.05);
}

#backToTop.show {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 768px) {

  #backToTop {
    width: 46px;
    height: 46px;
    bottom: 18px;
    right: 18px;
    font-size: 1.2rem;
  }

}