/* ============ HT+ Builder 2.0 — Notification Center (Phase 4) ============ */
#htbn { position: fixed; left: 18px; bottom: 18px; z-index: 99990; font-size: 14px; }
#htbn-bell {
  position: relative; width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid rgba(0,0,0,.12); background: #fff; color: #1a1a1a;
  box-shadow: 0 4px 14px rgba(0,0,0,.18); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
#htbn-bell:hover { transform: translateY(-1px); }
#htbn-badge {
  position: absolute; top: -4px; right: -4px; min-width: 18px; height: 18px;
  border-radius: 9px; background: #d33; color: #fff; font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; padding: 0 4px;
}
#htbn-panel {
  position: absolute; left: 0; bottom: 56px; width: 330px; max-width: calc(100vw - 36px);
  background: #fff; color: #1a1a1a; border: 1px solid rgba(0,0,0,.1); border-radius: 12px;
  box-shadow: 0 12px 34px rgba(0,0,0,.22); overflow: hidden;
}
.htbn-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid rgba(0,0,0,.08); }
.htbn-head b { font-size: 15px; }
.htbn-headacts { display: flex; gap: 8px; align-items: center; }
.htbn-headacts button { border: 0; background: none; color: #0668a5; cursor: pointer; font-size: 12px; padding: 2px 4px; }
#htbn-gear { font-size: 15px; color: #666; }
.htbn-prefs { padding: 10px 14px; border-bottom: 1px solid rgba(0,0,0,.08); background: #fafafa; display: grid; gap: 6px; }
.htbn-prefs label { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 13px; }
.htbn-list { max-height: 340px; overflow-y: auto; }
.htbn-item { display: flex; gap: 10px; padding: 11px 14px; border-bottom: 1px solid rgba(0,0,0,.05); text-decoration: none; color: inherit; }
a.htbn-item:hover { background: #f6f9fc; }
.htbn-item.read { opacity: .62; }
.htbn-ic { flex: 0 0 auto; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; }
.htbn-ic-price_drop { background: #e7f6ec; color: #1c7c3c; }
.htbn-ic-back_in_stock { background: #e8f1fb; color: #0b62a8; }
.htbn-ic-upgrade_rec { background: #fdf3e2; color: #b06d0a; }
.htbn-bd { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.htbn-t { font-weight: 700; font-size: 13px; }
.htbn-n { font-size: 13px; color: #333; overflow: hidden; text-overflow: ellipsis; }
.htbn-p { font-size: 13px; }
.htbn-p s { color: #999; }
.htbn-d { font-size: 11px; color: #999; }
.htbn-empty { padding: 26px 18px; text-align: center; color: #555; }
.htbn-empty span { font-size: 12px; color: #999; }
@media (max-width: 640px) {
  #htbn { left: 12px; bottom: 76px; }
}
/* dark-mode friendliness if the site theme sets it */
@media (prefers-color-scheme: dark) {
  body.htx-dark #htbn-bell, body.htx-dark #htbn-panel { background: #1e2126; color: #eee; border-color: rgba(255,255,255,.14); }
  body.htx-dark a.htbn-item:hover { background: #262b31; }
  body.htx-dark .htbn-prefs { background: #23272c; }
  body.htx-dark .htbn-n { color: #ccc; }
}