/* Optimum page styles */
.optimum-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.25rem 1.25rem;
}

.optimum-hero h1 {
  margin: 0 0 0.75rem 0;
}

.optimum-lead {
  font-size: 1.125rem;
  line-height: 1.65;
  margin: 0 0 0.75rem 0;
}

.optimum-sublead {
  margin: 0;
  opacity: 0.9;
  line-height: 1.65;
}

.optimum-hero-media {
  padding-top: 0.5rem;
}

.optimum-diagram {
  background: rgba(0,0,0,0.03);
  border-radius: 18px;
  padding: 1.25rem;
  overflow: hidden;
}

.optimum-diagram img,
.optimum-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.optimum-two-col {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .optimum-two-col {
    grid-template-columns: 1fr 1fr;
  }
}

.optimum-block {
  background: rgba(0,0,0,0.03);
  border-radius: 18px;
  padding: 1.25rem;
}

.optimum-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .optimum-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.optimum-card {
  background: #fff;
  border-radius: 18px;
  padding: 1.25rem;
  border: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.optimum-card__header h3 {
  margin: 0.5rem 0 0.5rem 0;
  font-size: 1.1rem;
}

.optimum-card__lead {
  margin: 0 0 0.75rem 0;
  line-height: 1.6;
  opacity: 0.92;
}

.optimum-kernvraag {
  opacity: 0.75;
  font-weight: 600;
}

.optimum-chip {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: rgba(0,0,0,0.06);
}

.optimum-chip--value {
  background: rgba(0,0,0,0.06);
}

.optimum-chip--both {
  background: rgba(0,0,0,0.06);
}

/* Collapsible details */
.optimum-details {
  border-top: 1px solid rgba(0,0,0,0.08);
  padding-top: 0.75rem;
}

.optimum-details summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

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

.optimum-details summary::after {
  content: "▾";
  float: right;
  opacity: 0.75;
}

.optimum-details[open] summary::after {
  content: "▴";
}

.optimum-details__body {
  margin-top: 0.75rem;
  line-height: 1.65;
  opacity: 0.95;
}

/* kleiner + gecentreerd diagram */
.optimum-diagram--sm {
  max-width: 500px;   /* pas aan: 560 / 640 / 720 */
  margin: 0 auto;
}

/* als je ook minder padding wilt */
.optimum-diagram {
  padding: 0.9rem;
}