.presentation-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 30px 18px;
}

.presentation-card {
  background: white;
  border-radius: 14px;
  margin-bottom: 22px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.presentation-card summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 70px 22px 24px;
  position: relative;
  font-family: "Roboto", Arial, sans-serif;
  font-size: 28px;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, #004080, #0066cc);
  user-select: none;
}

.presentation-card summary::-webkit-details-marker {
  display: none;
}

.presentation-card summary::marker {
  content: "";
}

/* Fermé : > */
.presentation-card summary::after {
  content: "›";
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  transition: none;
}

/* Ouvert : v */
.presentation-card[open] summary::after {
  content: "⌄";
  transform: translateY(-50%);
  font-size: 30px;
  font-weight: 700;
}

.presentation-content {
  padding: 24px;
  background: #ffffff;
}

.presentation-content p {
  margin: 0 0 18px;
  font-size: 20px;
  line-height: 1.8;
  color: #333;
  text-align: justify;
}

.presentation-content p:last-child {
  margin-bottom: 0;
}

/* Mobile */
@media (max-width: 768px) {
  .presentation-wrapper {
    padding: 18px 10px;
  }

  .presentation-card summary {
    font-size: 22px;
    padding: 18px 56px 18px 18px;
  }

  .presentation-card summary::after {
    right: 18px;
    font-size: 30px;
  }

  .presentation-card[open] summary::after {
    font-size: 26px;
  }

  .presentation-content {
    padding: 18px;
  }

  .presentation-content p {
    font-size: 18px;
    line-height: 1.7;
    text-align: left;
  }
}