:root {
    --bg: #0b0f14;
    --bg-elevated: #121820;
    --bg-strip: #0e131a;
    --fg: #f4f6f8;
    --fg-muted: #93a1ae;
    --border: #1c242e;
    --border-card: #1c242e;
    --accent: #22d3ee;
    --accent-fg: #0b0f14;
    --accent-soft: rgba(34, 211, 238, 0.14);
    --font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
    --font-body: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-body);
    line-height: 1.5;
  }
  a { text-decoration: none; color: inherit; }
  img, svg { display: block; max-width: 100%; }
  .wrap { max-width: 1040px; margin: 0 auto; }
  .section-pad { padding-left: 64px; padding-right: 64px; }
  .eyebrow {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 0.82rem;
    letter-spacing: 0.08em;
  }

  /* ---------- Header ---------- */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 20px 64px;
    background: rgba(11, 15, 20, 0.88);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
  }
  .logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2.15rem;
    letter-spacing: -0.01em;
    white-space: nowrap;
  }
  .logo span { color: var(--accent); }
  .nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
  }
  .nav-link {
    color: var(--fg-muted);
    font-size: 0.9rem;
    transition: color 0.15s ease;
  }
  .nav-link:hover { color: var(--fg); }
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 14px 28px;
    border-radius: 6px;
    transition: transform 0.15s ease, opacity 0.15s ease, border-color 0.15s ease;
  }
  .btn-sm { font-size: 0.85rem; padding: 10px 20px; }
  .btn-primary { background: var(--accent); color: var(--accent-fg); }
  .btn-primary:hover { transform: translateY(-1px); opacity: 0.92; }
  .btn-outline { border: 1px solid var(--border); color: var(--fg); }
  .btn-outline:hover { border-color: var(--accent); }

  /* ---------- Hero ---------- */
  .hero {
    position: relative;
    padding: 120px 64px 100px;
    overflow: hidden;
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
    background-size: 28px 28px;
    opacity: 0.6;
    pointer-events: none;
  }
  .hero-inner { position: relative; }
  .hero h1 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.4rem, 5vw, 4rem);
    line-height: 1.06;
    letter-spacing: -0.02em;
    margin: 20px 0 24px;
  }
  .hero p {
    font-size: 1.15rem;
    line-height: 1.6;
    color: var(--fg-muted);
    max-width: 560px;
    margin: 0 0 36px;
  }
  .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

  /* ---------- Profil ---------- */
  .profil {
    padding: 80px 64px;
    border-top: 1px solid var(--border);
  }
  .profil .wrap {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 48px;
  }
  .profil h2 {
    font-size: 1.3rem;
    line-height: 1.55;
    margin: 0 0 20px;
    font-weight: 500;
  }
  .profil p.body { font-size: 1rem; line-height: 1.75; color: var(--fg-muted); margin: 0; }

  /* ---------- Parcours / stats ---------- */
  .parcours {
    padding: 56px 64px;
    background: var(--bg-strip);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
  .stats-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }
  .stat-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2.2rem;
    color: var(--accent);
  }
  .stat-label { font-size: 0.95rem; color: var(--fg-muted); margin-top: 6px; }

  /* ---------- Expertises ---------- */
  .expertises { padding: 100px 64px; }
  .expertises-head { max-width: 640px; margin: 0 0 56px; }
  .expertises-head h2 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.7rem, 3vw, 2.3rem);
    margin: 16px 0 0;
  }
  .expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-card);
    border-radius: 10px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: border-color 0.15s ease, transform 0.15s ease;
  }
  .card:hover { border-color: var(--accent); transform: translateY(-2px); }
  .card-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--accent-soft);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .card-icon svg { stroke: var(--accent); }
  .card h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; margin: 0; }
  .card p { font-size: 0.95rem; line-height: 1.6; color: var(--fg-muted); margin: 0; }

  /* ---------- FAQ ---------- */
  .faq {
    padding: 100px 64px;
    border-top: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(18, 24, 32, 0.2) 0%, rgba(11, 15, 20, 0.95) 100%);
  }
  .faq-head { max-width: 760px; margin: 0 0 44px; }
  .faq-head h2 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.7rem, 3vw, 2.3rem);
    margin: 16px 0 0;
  }
  .faq-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .faq-item {
    background: var(--bg-elevated);
    border: 1px solid var(--border-card);
    border-radius: 10px;
    padding: 22px 24px;
  }
  .faq-item h3 {
    margin: 0 0 10px;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: var(--font-display);
  }
  .faq-item p {
    margin: 0;
    color: var(--fg-muted);
    font-size: 0.95rem;
    line-height: 1.65;
  }

  /* ---------- Faits cles / GEO ---------- */
  .facts {
    padding: 72px 64px;
    background: var(--bg-strip);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
  .facts-head {
    max-width: 760px;
    margin: 0 0 28px;
  }
  .facts-head h2 {
    margin: 14px 0 0;
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 2.6vw, 2rem);
    line-height: 1.2;
  }
  .facts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .fact {
    background: var(--bg-elevated);
    border: 1px solid var(--border-card);
    border-radius: 10px;
    padding: 18px;
  }
  .fact h3 {
    margin: 0 0 8px;
    font-size: 0.98rem;
    font-weight: 600;
    font-family: var(--font-display);
  }
  .fact p {
    margin: 0;
    color: var(--fg-muted);
    font-size: 0.9rem;
    line-height: 1.6;
  }

  /* ---------- Contact ---------- */
  .contact {
    position: relative;
    padding: 100px 64px;
    border-top: 1px solid var(--border);
    overflow: hidden;
  }
  .contact::before {
    content: "";
    position: absolute;
    top: -120px;
    right: -120px;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: var(--accent-soft);
    filter: blur(60px);
    pointer-events: none;
  }
  .contact-inner { position: relative; max-width: 640px; }
  .contact h2 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.7rem, 3vw, 2.3rem);
    margin: 16px 0 20px;
  }
  .contact p { font-size: 1.05rem; line-height: 1.7; color: var(--fg-muted); margin: 0 0 32px; }
  .mail-btn:hover { opacity: 0.85; transform: translateY(-1px); }
  .mail-btn svg { stroke: var(--accent-fg); }

  /* ---------- Footer ---------- */
  .site-footer {
    padding: 32px 64px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
  }
  .site-footer .copy { font-family: var(--font-mono); font-size: 0.8rem; color: var(--fg-muted); }
  .site-footer .legal { font-size: 0.8rem; color: var(--fg-muted); }

  /* ---------- Retour en haut ---------- */
  .back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 46px;
    height: 46px;
    border-radius: 999px;
    background: var(--accent);
    color: var(--accent-fg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    border: 1px solid transparent;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    z-index: 30;
    transition: transform 0.15s ease, opacity 0.15s ease;
  }
  .back-to-top:hover {
    transform: translateY(-2px);
    opacity: 0.92;
  }

  /* ---------- Responsive ---------- */
  @media (max-width: 760px) {
    .nav-links { display: none; }
    .section-pad,
    .site-header,
    .hero,
    .profil,
    .parcours,
    .expertises,
    .faq,
    .facts,
    .contact,
    .site-footer { padding-left: 24px; padding-right: 24px; }
    .hero { padding-top: 88px; padding-bottom: 64px; }
    .profil .wrap { grid-template-columns: 1fr; gap: 20px; }
    .stats-strip { grid-template-columns: 1fr; }
    .expertise-grid { grid-template-columns: 1fr; }
    .facts-grid { grid-template-columns: 1fr; }
    .back-to-top {
      right: 16px;
      bottom: 16px;
    }
  }