/* Homepage disclosures. The unenhanced source remains fully readable. */
.site-section[data-section-collapsible] .section-heading {
  margin-bottom: 0;
}

.site-section[data-section-open="false"] {
  padding-top: 1.4rem;
  padding-bottom: 1.4rem;
}

.section-toggle {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.75rem;
  width: 100%;
  min-height: 44px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  line-height: inherit;
  text-align: left;
  cursor: pointer;
}

.section-toggle:hover {
  color: var(--accent);
  background: color-mix(in srgb, var(--ink) 4%, transparent);
}

.section-toggle:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 6px;
}

.section-toggle__indicator {
  position: relative;
  flex: 0 0 1.1rem;
  width: 1.1rem;
  height: 1.1rem;
  margin-right: 0.2rem;
  color: var(--ink);
}

/* Keep this geometry local: native topic indicators intentionally repeat it
 * so independently cached component styles never depend on a newer main.css. */
.section-toggle__indicator::before,
.section-toggle__indicator::after {
  position: absolute;
  top: calc(50% - 0.75px);
  left: 0;
  width: 100%;
  height: 0;
  border-top: 1.5px solid currentColor;
  content: "";
}

.section-toggle__indicator::after {
  transform: rotate(90deg);
  transition: transform 150ms ease;
}

.section-toggle[aria-expanded="true"] .section-toggle__indicator::after {
  transform: rotate(0deg);
}

.section-content {
  margin-top: 2.5rem;
}

.section-content[data-has-introduction="true"] {
  margin-top: 1.1rem;
}

.section-content > .section-heading__introduction {
  margin: 0 0 1.1rem;
}

.section-content > [data-section-introduction-last] {
  margin-bottom: 2.5rem;
}

/* A brief, quiet viewport hint: no heading decoration or layout changes. */
.viewport-collapse-hint {
  position: fixed;
  left: max(0.6rem, env(safe-area-inset-left));
  bottom: max(0.6rem, env(safe-area-inset-bottom));
  z-index: 10;
  max-width: calc(100vw - 1.2rem);
  padding: 0.15rem 0.3rem;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--modern);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: normal;
  line-height: 1.4;
  white-space: pre-wrap;
  pointer-events: none;
  user-select: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 0s linear 300ms;
}

.viewport-collapse-hint[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transition: none;
}

@media (prefers-reduced-motion: reduce) {
  .section-toggle__indicator::after {
    transition: none;
  }

  .viewport-collapse-hint {
    transition: none;
  }
}

@media print {
  .site-section[data-section-collapsible] {
    padding: 1.2cm 0;
  }

  .section-content[hidden] {
    display: block !important;
  }

  .section-toggle {
    color: inherit;
  }

  .section-toggle__indicator {
    display: none;
  }

  .viewport-collapse-hint {
    display: none !important;
  }
}