/* ===========================================================================
   Bspec Support — Release Notes feed
   A chronological accordion of sent release-update emails. Blue "Platform"
   accent to match the BlueStep Platform Support section. Namespaced under
   .bsReleaseNotes so it can't collide with the host page (which runs jQuery).
   =========================================================================== */

.bsReleaseNotes {
  --bsr-accent: #0063A6;
  --bsr-tint: #e6f0f8;
  --bsr-ink: #1f2937;
  --bsr-muted: #6b7280;
  --bsr-border: #e2e6ea;
  --bsr-card: #ffffff;
  --bsr-bg: #f4f5f7;
  width: 100%;
  max-width: 900px;
  margin: 20px auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--bsr-ink);
  font-family: system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  box-sizing: border-box;
  padding: 0 16px;
}
.bsReleaseNotes * { box-sizing: border-box; }

/* --- one release (a <details> card) --- */
.bsReleaseNotes .bsr-item {
  background: var(--bsr-card);
  border: 1px solid var(--bsr-border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.bsReleaseNotes .bsr-item[open] {
  border-color: var(--bsr-accent);
  box-shadow: 0 1px 4px rgba(0, 99, 166, .12);
}

/* --- clickable summary row --- */
.bsReleaseNotes .bsr-sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  border-left: 3px solid transparent;
}
.bsReleaseNotes .bsr-item[open] .bsr-sum { border-left-color: var(--bsr-accent); }
.bsReleaseNotes .bsr-sum::-webkit-details-marker { display: none; }
.bsReleaseNotes .bsr-sum:hover { background: var(--bsr-tint); }

.bsReleaseNotes .bsr-sum-main {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.bsReleaseNotes .bsr-subject {
  font-size: 15px;
  font-weight: 650;
  line-height: 1.35;
  color: var(--bsr-ink);
}
.bsReleaseNotes .bsr-date {
  font-size: 12.5px;
  color: var(--bsr-muted);
  font-variant-numeric: tabular-nums;
}

.bsReleaseNotes .bsr-chev {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  color: var(--bsr-accent);
  transition: transform .18s ease;
}
.bsReleaseNotes .bsr-item[open] .bsr-chev { transform: rotate(90deg); }

/* --- expanded email preview --- */
.bsReleaseNotes .bsr-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--bsr-border);
}
.bsReleaseNotes .bsr-frame {
  width: 100%;
  height: 620px;
  margin-top: 12px;
  border: 1px solid var(--bsr-border);
  border-radius: 8px;
  background: #ffffff;
  display: block;
}

/* --- empty state --- */
.bsReleaseNotes .bsr-empty {
  margin: 0;
  padding: 28px 16px;
  text-align: center;
  color: var(--bsr-muted);
  background: var(--bsr-card);
  border: 1px dashed var(--bsr-border);
  border-radius: 10px;
}

@media (max-width: 600px) {
  .bsReleaseNotes .bsr-frame { height: 70vh; }
}
@media (prefers-reduced-motion: reduce) {
  .bsReleaseNotes .bsr-item,
  .bsReleaseNotes .bsr-chev { transition: none; }
}