.intro-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .55);
  display: none;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 5vh, 3rem) clamp(1.25rem, 6vw, 3rem);
  overflow-y: auto;
  z-index: 1100
}

.intro-modal {
  background: var(--bg);
  color: var(--fg);
  border-radius: .75rem;
  padding: 1.5rem;
  width: min(620px, 94vw);
  max-height: min(92vh, 720px);
  overflow-y: auto;
  box-shadow: 0 14px 32px rgba(0, 0, 0, .3);
  display: flex;
  flex-direction: column;
  gap: 1.25rem
}

.intro-header h3 {
  font-size: 1.32rem;
  margin: 0 0 .25rem
}

.intro-header p {
  margin: 0;
  color: var(--muted, rgba(255, 255, 255, .78));
  line-height: 1.5
}

.intro-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr))
}

.intro-grid label {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  font-size: .95rem
}

.intro-grid input,
.intro-grid select {
  width: 100%;
  border-radius: .55rem;
  border: 1px solid var(--modal-border, rgba(255, 255, 255, .12));
  background: var(--modal-surface, rgba(0, 0, 0, .15));
  color: inherit;
  padding: .55rem .75rem;
  font-size: .95rem
}

.intro-grid input:focus,
.intro-grid select:focus {
  outline: 2px solid var(--primary, var(--primary-dark));
  outline-offset: 2px
}

.intro-label {
  font-weight: 600
}

.intro-footer {
  display: flex;
  flex-direction: column;
  gap: 1rem
}

.intro-options {
  display: grid;
  gap: .65rem
}

.intro-checkbox {
  display: flex;
  align-items: center;
  gap: .65rem;
  font-size: .95rem
}

.intro-checkbox input[type="checkbox"] {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--primary, var(--primary-dark))
}

.intro-actions {
  display: flex;
  justify-content: flex-end;
  gap: .75rem
}

.intro-backdrop[aria-hidden="true"] {
  display: none
}

.intro-backdrop[aria-hidden="false"] {
  display: flex
}

@media (max-height: 640px) {
  .intro-backdrop {
    align-items: flex-start;
  }
}

@media (min-width: 600px) {
  .intro-footer {
    flex-direction: row;
    align-items: center;
    justify-content: space-between
  }

  .intro-options {
    grid-auto-flow: row;
    grid-template-columns: 1fr;
    justify-items: flex-start;
    gap: .65rem
  }
}