:root {
      --bleu: #2e4487;
      --bleu-fonce: #172654;
      --bleu-clair: #eef2ff;
      --orange: #e07810;
      --orange-clair: #fff4e8;
      --texte: #263044;
      --texte-doux: #667085;
      --fond: #f5f7fb;
      --blanc: #ffffff;
      --bordure: #e3e8f2;
      --ombre: 0 14px 38px rgba(29, 46, 91, .09);
      --rayon: 22px;
      --largeur: 1180px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--texte);
      background: var(--fond);
      font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      line-height: 1.65;
    }
    img { display: block; max-width: 100%; height: auto; }
    a { color: var(--bleu); font-weight: 700; text-decoration: none; }
    a:hover, a:focus { color: var(--orange); text-decoration: underline; }
    :focus-visible { outline: 3px solid rgba(224, 120, 16, .4); outline-offset: 3px; }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 20;
      border-bottom: 1px solid rgba(227, 232, 242, .95);
      background: rgba(255, 255, 255, .94);
      backdrop-filter: blur(14px);
    }
    .topbar-inner {
      width: min(var(--largeur), calc(100% - 32px));
      min-height: 72px;
      margin: auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
    }
    .brand { display: flex; align-items: center; gap: 13px; color: var(--bleu-fonce); }
    .brand:hover { text-decoration: none; }
    .brand-mark {
      width: 42px; height: 42px; border-radius: 14px;
      display: grid; place-items: center;
      color: white; background: var(--bleu);
      font-weight: 900; letter-spacing: -.04em;
    }
    .brand strong { display: block; font-size: .92rem; letter-spacing: .08em; }
    .brand small { display: block; color: var(--texte-doux); font-weight: 500; }
    .menu { margin: 0; padding: 0; display: flex; gap: 8px; list-style: none; }
    .menu a { display: block; padding: 9px 13px; border-radius: 999px; color: #4c5870; font-size: .92rem; }
    .menu a:hover { background: var(--bleu-clair); color: var(--bleu); text-decoration: none; }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 76px 16px 64px;
      background:
        radial-gradient(circle at 87% 15%, rgba(224,120,16,.18), transparent 25%),
        radial-gradient(circle at 5% 90%, rgba(46,68,135,.16), transparent 28%),
        linear-gradient(145deg, #fbfcff 0%, #f2f5fc 100%);
    }
    .hero-inner {
      width: min(var(--largeur), 100%);
      margin: auto;
      display: grid;
      grid-template-columns: 1fr 1.08fr;
      align-items: center;
      gap: 58px;
    }
    .eyebrow {
      display: inline-flex;
      padding: 7px 12px;
      border-radius: 999px;
      background: var(--bleu-clair);
      color: var(--bleu);
      font-size: .78rem;
      font-weight: 800;
      letter-spacing: .12em;
      text-transform: uppercase;
    }
    h1 { margin: 20px 0 17px; color: var(--bleu-fonce); font-size: clamp(2.7rem, 6vw, 5.3rem); line-height: .98; letter-spacing: -.055em; }
    .hero-copy { margin: 0; max-width: 600px; color: var(--texte-doux); font-size: 1.15rem; }
    .hero-actions { margin-top: 28px; display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
    .button {
      display: inline-flex; align-items: center; gap: 9px;
      padding: 13px 20px; border-radius: 999px;
      color: white; background: var(--orange);
      box-shadow: 0 10px 24px rgba(224,120,16,.22);
    }
    .button:hover { color: white; background: #c96508; text-decoration: none; transform: translateY(-1px); }
    .date-note { color: var(--texte-doux); font-size: .92rem; }
    .hero-card {
      position: relative; overflow: hidden;
      min-height: 400px; padding: 38px;
      border-radius: 34px;
      color: white;
      background: linear-gradient(145deg, var(--bleu-fonce), var(--bleu) 63%, #5873c4);
      box-shadow: 0 30px 70px rgba(23,38,84,.22);
    }
    .hero-card::before {
      content: ""; position: absolute; width: 260px; height: 260px; right: -110px; top: -100px;
      border: 42px solid rgba(255,255,255,.08); border-radius: 50%;
    }
    .hero-card-content { position: relative; min-height: 324px; display: flex; flex-direction: column; justify-content: space-between; }
    .month { align-self: flex-start; padding: 7px 12px; border-radius: 999px; background: rgba(255,255,255,.13); font-size: .8rem; font-weight: 800; }
    .hero-card h2 { max-width: 600px; margin: 0 0 14px; font-size: clamp(1.9rem, 4vw, 3.1rem); line-height: 1.08; letter-spacing: -.035em; }
    .hero-card p { margin: 0; color: #e8edff; }

    main { width: min(var(--largeur), calc(100% - 32px)); margin: auto; padding: 72px 0; }
    .section { scroll-margin-top: 95px; margin-bottom: 88px; }
    .section-heading { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 20px; margin-bottom: 28px; }
    .kicker { margin: 0 0 5px; color: var(--orange); font-size: .78rem; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
    .section h2 { margin: 0; color: var(--bleu-fonce); font-size: clamp(2rem, 4vw, 3.35rem); line-height: 1.08; letter-spacing: -.04em; }
    .section-intro { max-width: 450px; margin: 0; color: var(--texte-doux); }

    .cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
    .card {
      position: relative;
      border: 1px solid var(--bordure);
      border-radius: var(--rayon);
      background: var(--blanc);
      box-shadow: 0 3px 10px rgba(29,46,91,.035);
      transition: transform .2s ease, box-shadow .2s ease;
    }
    .card:hover { transform: translateY(-3px); box-shadow: var(--ombre); }
    .event-card { padding: 25px; display: grid; grid-template-columns: 78px 1fr; gap: 20px; }
    .team-logo {
      width: 78px; min-height: 78px; padding: 9px;
      display: grid; place-items: center;
      border-radius: 18px; background: #f8f9fc; border: 1px solid var(--bordure);
    }
    .team-logo img { max-height: 58px; object-fit: contain; }
    .event-card p { margin: 0; }
    .event-card p + p { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--bordure); }
    .event-card strong { color: var(--bleu-fonce); }
    .event-card em { color: #4c5870; }

    .people { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
    .person { padding: 25px; display: flex; align-items: center; gap: 20px; }
    .person img { width: 92px; height: 92px; object-fit: cover; border-radius: 24px; box-shadow: 0 8px 24px rgba(29,46,91,.14); }
    .person h3 { margin: 0 0 5px; color: var(--bleu-fonce); font-size: 1.3rem; }
    .person p { margin: 0; color: var(--texte-doux); }
    .tag { display: inline-block; margin-top: 11px; padding: 5px 10px; border-radius: 999px; color: var(--bleu); background: var(--bleu-clair); font-size: .76rem; font-weight: 800; }

    .agenda { padding: 30px; background: linear-gradient(135deg, var(--blanc), var(--orange-clair)); }
    .agenda-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
    .agenda-item { padding: 2px 0 2px 18px; border-left: 4px solid var(--orange); }
    .agenda-item h3 { margin: 0 0 8px; color: var(--bleu-fonce); }
    .agenda-item p { margin: 0; }

    .site-footer { padding: 62px 16px 34px; color: #dfe6ff; background: var(--bleu-fonce); }
    .footer-inner { width: min(var(--largeur), 100%); margin: auto; display: grid; grid-template-columns: 1.2fr .8fr; gap: 44px; }
    .footer-inner h2 { margin: 0 0 12px; color: white; font-size: 2rem; }
    .footer-inner p { margin: 7px 0; }
    .site-footer a { color: white; }
    .socials { display: flex; flex-wrap: wrap; gap: 10px; align-content: start; justify-content: flex-end; }
    .social-link { padding: 10px 14px; border: 1px solid rgba(255,255,255,.18); border-radius: 999px; }
    .credits { width: min(var(--largeur), 100%); margin: 34px auto 0; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.12); color: #aebadc; font-size: .85rem; }

    @media (max-width: 900px) {
      .topbar-inner { padding: 12px 0; align-items: flex-start; }
      .menu { justify-content: flex-end; flex-wrap: wrap; }
      .hero { padding-top: 48px; }
      .hero-inner { grid-template-columns: 1fr; gap: 38px; }
      .cards, .agenda-grid { grid-template-columns: 1fr; }
      .section-heading { grid-template-columns: 1fr; }
    }
    @media (max-width: 660px) {
      .topbar { position: static; }
      .topbar-inner { display: block; }
      .menu { margin-top: 12px; justify-content: flex-start; gap: 3px; }
      .menu a { padding: 7px 9px; font-size: .78rem; }
      .hero { padding: 44px 16px; }
      .hero-card { min-height: 340px; padding: 26px; border-radius: 25px; }
      .hero-card-content { min-height: 288px; }
      main { padding-top: 52px; }
      .section { margin-bottom: 66px; }
      .event-card { grid-template-columns: 1fr; }
      .team-logo { width: 92px; }
      .people { grid-template-columns: 1fr; }
      .person { align-items: flex-start; }
      .footer-inner { grid-template-columns: 1fr; }
      .socials { justify-content: flex-start; }
    }

/* ==========================================================
   Rubrique Ouvrages
   ========================================================== */
.books {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  gap: 22px;
}

.book-card {
  overflow: hidden;
  min-width: 0;
  height: 100%;
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  align-items: stretch;
}

.book-cover {
  min-height: 100%;
  padding: 20px;
  display: grid;
  place-items: center;
  background: linear-gradient(155deg, var(--bleu-clair), #f9faff);
  border-right: 1px solid var(--bordure);
}

.book-cover img {
  display: block;
  width: 100%;
  max-width: 140px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 16px 32px rgba(23, 38, 84, .20);
}

.book-content {
  min-width: 0;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.book-label {
  margin: 0 0 7px;
  color: var(--orange);
  font-size: .73rem;
  font-weight: 900;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.book-content h3 {
  margin: 0 0 16px;
  color: var(--bleu-fonce);
  font-size: 1.35rem;
  line-height: 1.2;
}

.book-meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 5px 12px;
  margin: 0 0 17px;
  color: var(--texte-doux);
  font-size: .89rem;
}

.book-meta dt {
  color: var(--bleu-fonce);
  font-weight: 800;
}

.book-meta dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}

.book-summary {
  margin: 0 0 18px;
}

.book-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
}

@media (max-width: 1050px) {
  .book-card {
    grid-template-columns: 125px minmax(0, 1fr);
  }

  .book-cover {
    padding: 16px;
  }

  .book-content {
    padding: 20px;
  }
}

@media (max-width: 760px) {
  .books {
    grid-template-columns: 1fr;
  }

  .book-card {
    grid-template-columns: minmax(135px, 180px) minmax(0, 1fr);
  }
}

@media (max-width: 560px) {
  .book-card {
    grid-template-columns: 1fr;
  }

  .book-cover {
    min-height: 235px;
    border-right: 0;
    border-bottom: 1px solid var(--bordure);
  }

  .book-cover img {
    max-width: 145px;
  }

  .book-meta {
    grid-template-columns: 1fr;
    gap: 1px;
  }

  .book-meta dd {
    margin-bottom: 8px;
  }
}

/* ==========================================================
   Logos horizontaux dans les blocs Séminaires et Doctorat
   ========================================================== */
.event-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
}

.event-card .team-logo {
  width: 100%;
  min-height: 105px;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-bottom: 1px solid var(--bordure);
  border-radius: var(--rayon) var(--rayon) 0 0;
  background: linear-gradient(135deg, var(--bleu-clair), #fafbff);
}

.event-card .team-logo img {
  width: auto;
  max-width: min(170px, 70%);
  max-height: 50px;
  object-fit: contain;
}

.event-card > div:not(.team-logo) {
  flex: 1;
  padding: 25px;
}

@media (max-width: 660px) {
  .event-card .team-logo {
    min-height: 90px;
    padding: 15px 20px;
  }

  .event-card .team-logo img {
    max-width: min(200px, 78%);
    max-height: 60px;
  }

  .event-card > div:not(.team-logo) {
    padding: 21px;
  }
}

/* ==========================================================
   Logo institutionnel dans le bandeau supérieur
   ========================================================== */
.brand {
  flex: 0 1 420px;
  min-width: 250px;
}

.brand-logo {
  display: block;
  width: min(390px, 100%);
  height: auto;
  object-fit: contain;
}

@media (max-width: 900px) {
  .topbar-inner {
    align-items: center;
  }

  .brand {
    flex-basis: 340px;
  }

  .brand-logo {
    width: min(330px, 100%);
  }
}

@media (max-width: 660px) {
  .brand {
    min-width: 0;
    width: 100%;
  }

  .brand-logo {
    width: min(360px, 100%);
  }
}