/* ============================================================================
 * Collapsible deep-content section (the pre-footer SEO area).
 *
 * Native <details> rows, all collapsed by default. No JavaScript, keyboard
 * accessible, and the copy stays in the DOM for crawlers.
 * ========================================================================== */

.wb-collapse__list {
  max-width: 60rem;
  margin: clamp(2rem, 4vw, 3rem) auto 0;
  display: grid;
  gap: var(--wb-space-3);
}

.wb-collapse__row {
  background: var(--wb-color-surface);
  border: var(--wb-border-width) solid var(--wb-color-border);
  border-radius: var(--wb-radius-lg);
  overflow: hidden;
  transition: border-color var(--wb-duration-base) var(--wb-ease);
}
.wb-collapse__row:hover { border-color: var(--wb-color-border-strong); }
.wb-collapse__row[open] { border-color: var(--wb-color-brand); }

.wb-collapse__summary {
  display: flex;
  align-items: center;
  gap: var(--wb-space-4);
  padding: var(--wb-space-5) var(--wb-space-6);
  font-size: var(--wb-text-base);
  font-weight: var(--wb-fw-semibold);
  letter-spacing: -0.01em;
  color: var(--wb-color-ink);
  list-style: none;
  cursor: pointer;
}
.wb-collapse__summary::-webkit-details-marker { display: none; }
.wb-collapse__summary:focus-visible {
  outline: var(--wb-focus-width) solid var(--wb-color-focus-ring);
  outline-offset: -3px;
}

.wb-collapse__icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--wb-radius-md);
  background: var(--wb-color-brand-soft);
  color: var(--wb-color-brand);
  transition: background var(--wb-duration-base) var(--wb-ease),
              color var(--wb-duration-base) var(--wb-ease);
}
.wb-collapse__icon svg { width: 1.05rem; height: 1.05rem; }
.wb-collapse__row[open] .wb-collapse__icon {
  background: var(--wb-color-accent);
  color: var(--wb-color-white);
}

.wb-collapse__label { flex: 1 1 auto; }

/* Chevron drawn in CSS */
.wb-collapse__toggle {
  position: relative;
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
}
.wb-collapse__toggle::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.55rem;
  height: 0.55rem;
  margin: -0.4rem 0 0 -0.28rem;
  border-right: 2px solid var(--wb-color-text-muted);
  border-bottom: 2px solid var(--wb-color-text-muted);
  transform: rotate(45deg);
  transition: transform var(--wb-duration-base) var(--wb-ease);
}
.wb-collapse__row[open] .wb-collapse__toggle::before {
  margin-top: -0.12rem;
  transform: rotate(-135deg);
}

.wb-collapse__panel {
  padding: 0 var(--wb-space-6) var(--wb-space-6);
  border-top: var(--wb-border-width) solid var(--wb-color-border-soft);
  padding-top: var(--wb-space-5);
  margin-top: 0;
}
.wb-collapse__heading {
  margin: 0 0 var(--wb-space-4);
  font-size: var(--wb-text-xl);
  font-weight: var(--wb-fw-semibold);
  line-height: var(--wb-lh-snug);
  letter-spacing: -0.02em;
  color: var(--wb-color-ink);
}
.wb-collapse__panel p {
  margin: 0 0 var(--wb-space-4);
  font-size: var(--wb-text-base);
  line-height: var(--wb-lh-relaxed);
  color: var(--wb-color-text-muted);
  max-width: 52rem;
}
.wb-collapse__panel p:last-child { margin-bottom: 0; }
.wb-collapse__panel ul,
.wb-collapse__panel ol {
  margin: 0 0 var(--wb-space-4);
  padding-left: var(--wb-space-5);
  color: var(--wb-color-text-muted);
  line-height: var(--wb-lh-relaxed);
}

/* Gentle reveal — skipped entirely when reduced motion is requested */
@media (prefers-reduced-motion: no-preference) {
  .wb-collapse__row[open] .wb-collapse__panel {
    animation: wb-collapse-in var(--wb-duration-slow) var(--wb-ease-out) both;
  }
}
@keyframes wb-collapse-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.wb-reduce-motion .wb-collapse__row[open] .wb-collapse__panel { animation: none; }

@media (max-width: 560px) {
  .wb-collapse__summary { padding: var(--wb-space-4); gap: var(--wb-space-3); font-size: var(--wb-text-sm); }
  .wb-collapse__panel { padding-inline: var(--wb-space-4); padding-bottom: var(--wb-space-5); }
  .wb-collapse__icon { width: 2rem; height: 2rem; }
}