/* ─── Serendipitous Meetups button ─── */
#meetup-btn {
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid rgba(0, 159, 212, .4);
  background: rgba(0, 159, 212, .12);
  color: var(--accent-2);
  font-size: .78rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: all .2s;
  flex-shrink: 0;
}

#meetup-btn:hover {
  background: rgba(0, 159, 212, .25);
  border-color: rgba(0, 159, 212, .7);
  box-shadow: 0 4px 16px rgba(0, 159, 212, .3);
  transform: translateY(-1px);
}

/* ─── Overlay ─── */
#meetup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 15, 35, .45);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  z-index: 2100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s;
}

#meetup-overlay.open {
  opacity: 1;
  pointer-events: all;
}

/* ─── Panel ─── */
#meetup-panel {
  background: rgba(19, 41, 75, 0.38);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  border: 1px solid rgba(80, 130, 200, .25);
  border-radius: 16px;
  width: min(96vw, 960px);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .06);
  overflow: hidden;
}

/* ─── Header with inline topic bar ─── */
#meetup-hdr {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#meetup-hdr h2 {
  font-size: .88rem;
  font-weight: 700;
  white-space: nowrap;
}

#meetup-topic-bar {
  flex: 1;
  display: flex;
  gap: 6px;
  min-width: 0;
}

#meetup-topic-bar .clearable-input-wrap {
  flex: 1;
  min-width: 0;
}

#meetup-expertise-input {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding: 6px 30px 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: .76rem;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}

#meetup-expertise-input:focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 2px rgba(0, 159, 212, .2);
}

#meetup-match-summary {
  font-size: .68rem;
  color: var(--text-dim);
  white-space: nowrap;
}

#meetup-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1rem;
  padding: 4px 6px;
  border-radius: 6px;
  transition: color .15s;
  flex-shrink: 0;
}

#meetup-close:hover {
  color: var(--text);
}

/* ─── Empty state (before first search) ─── */
#meetup-empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  text-align: center;
  gap: 6px;
}

#meetup-empty-state[hidden],
#meetup-day-tabs[hidden],
#meetup-body[hidden] {
  display: none !important;
}

.meetup-empty-hero {
  font-size: 2.5rem;
  margin-bottom: 4px;
}

.meetup-empty-title {
  font-size: .88rem;
  font-weight: 600;
  color: var(--text);
}

.meetup-empty-sub {
  font-size: .72rem;
  color: var(--text-dim);
  max-width: 320px;
}

/* Day tabs */
#meetup-day-tabs {
  display: flex;
  gap: 6px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  flex-shrink: 0;
}

#meetup-day-tabs::-webkit-scrollbar {
  display: none;
}

.meetup-day-tab {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: .72rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all .15s;
  position: relative;
}

.meetup-day-tab:hover {
  border-color: var(--accent-2);
  color: var(--text);
}

.meetup-day-tab.active {
  background: var(--accent-2);
  border-color: var(--accent-2);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0, 159, 212, .35);
}

.meetup-day-tab .meetup-tab-count {
  display: inline-block;
  background: rgba(255, 255, 255, .2);
  border-radius: 8px;
  padding: 0 5px;
  font-size: .6rem;
  margin-left: 4px;
}

.meetup-day-tab.active .meetup-tab-count {
  background: rgba(255, 255, 255, .3);
}

/* ─── Body: timeline + map ─── */
#meetup-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Timeline column */
#meetup-timeline {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

#meetup-timeline::-webkit-scrollbar {
  width: 4px;
}

#meetup-timeline::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.meetup-period {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.meetup-period-label {
  font-size: .78rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(44, 78, 138, .3);
}

.meetup-period-label span {
  font-size: .65rem;
  font-weight: 400;
  color: var(--text-dim);
}

.meetup-clusters {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ─── Cluster card ─── */
.meetup-cluster-card {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  cursor: pointer;
  transition: all .18s;
  display: flex;
  gap: 12px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.meetup-cluster-card:hover {
  border-color: var(--accent-2);
  background: rgba(0, 159, 212, .06);
  transform: translateX(2px);
}

.meetup-cluster-card.hot {
  border-left: 3px solid #ff6b3d;
}

.meetup-cluster-card.warm {
  border-left: 3px solid var(--accent-2);
}

.meetup-cluster-card.cool {
  border-left: 3px solid #6b8fd4;
}

.meetup-cluster-heat {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  flex-shrink: 0;
  position: relative;
}

.meetup-cluster-card.hot .meetup-cluster-heat {
  background: rgba(255, 107, 61, .18);
  box-shadow: 0 0 12px rgba(255, 107, 61, .25);
}

.meetup-cluster-card.warm .meetup-cluster-heat {
  background: rgba(0, 159, 212, .15);
  box-shadow: 0 0 10px rgba(0, 159, 212, .2);
}

.meetup-cluster-card.cool .meetup-cluster-heat {
  background: rgba(107, 143, 212, .15);
}

@keyframes meetup-pulse {
  0%, 100% { transform: scale(1); opacity: .6; }
  50% { transform: scale(1.35); opacity: 0; }
}

.meetup-cluster-card.hot .meetup-cluster-heat::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid rgba(255, 107, 61, .4);
  animation: meetup-pulse 2s ease-in-out infinite;
}

.meetup-cluster-info {
  flex: 1;
  min-width: 0;
}

.meetup-cluster-name {
  font-size: .75rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 3px;
}

.meetup-cluster-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.meetup-cluster-domain-row {
  margin-top: 3px;
}

.meetup-cluster-tag {
  font-size: .6rem;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(44, 78, 138, .4);
  color: var(--text-dim);
  white-space: nowrap;
}

.meetup-cluster-tag.floor-tag {
  background: rgba(0, 159, 212, .15);
  color: var(--accent-2);
  font-weight: 600;
}

.meetup-cluster-tag.count-tag {
  background: rgba(255, 95, 5, .12);
  color: var(--accent);
  font-weight: 600;
}

.meetup-cluster-arrow {
  color: var(--text-dim);
  font-size: .8rem;
  flex-shrink: 0;
  transition: transform .15s;
}

.meetup-cluster-card:hover .meetup-cluster-arrow {
  transform: translateX(3px);
  color: var(--accent-2);
}

/* ─── Mini-map column ─── */
#meetup-map-col {
  width: 240px;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  padding: 12px;
  gap: 8px;
}

#meetup-minimap {
  flex: 1;
  position: relative;
  border-radius: 10px;
  background: rgba(11, 25, 44, .6);
  border: 1px solid rgba(44, 78, 138, .3);
  overflow: hidden;
  min-height: 200px;
}

#meetup-minimap-floors {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  padding: 10px 12px;
}

.meetup-mm-floor {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .6rem;
  color: var(--text-dim);
  font-weight: 600;
  padding: 5px 6px;
  border-bottom: 1px dashed rgba(44, 78, 138, .2);
  border-radius: 6px;
  cursor: pointer;
  transition: background .15s, color .15s, box-shadow .15s;
  user-select: none;
}

.meetup-mm-floor:last-child {
  border-bottom: none;
}

.meetup-mm-floor:hover {
  background: rgba(44, 78, 138, .25);
  color: var(--text);
}

.meetup-mm-floor.active {
  background: rgba(0, 159, 212, .15);
  color: var(--accent-2);
  box-shadow: inset 0 0 0 1px rgba(0, 159, 212, .35);
}

.meetup-mm-floor.active .meetup-mm-floor-label {
  color: var(--accent-2);
}

.meetup-mm-floor.active .meetup-mm-count {
  color: var(--accent-2);
}

.meetup-mm-floor-label {
  width: 28px;
  text-align: right;
  flex-shrink: 0;
}

.meetup-mm-bar-wrap {
  flex: 1;
  height: 14px;
  background: rgba(44, 78, 138, .15);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.meetup-mm-bar {
  height: 100%;
  border-radius: 4px;
  transition: width .4s ease;
  min-width: 0;
}

.meetup-mm-bar.hot {
  background: linear-gradient(90deg, rgba(255, 107, 61, .6), rgba(255, 107, 61, .3));
}

.meetup-mm-bar.warm {
  background: linear-gradient(90deg, rgba(0, 159, 212, .5), rgba(0, 159, 212, .25));
}

.meetup-mm-bar.cool {
  background: linear-gradient(90deg, rgba(107, 143, 212, .4), rgba(107, 143, 212, .2));
}

.meetup-mm-count {
  font-size: .55rem;
  color: var(--text-dim);
}

#meetup-minimap-dots {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.meetup-mm-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all .3s ease;
}

.meetup-mm-dot.hot {
  background: #ff6b3d;
  box-shadow: 0 0 8px rgba(255, 107, 61, .5);
}

.meetup-mm-dot.warm {
  background: var(--accent-2);
  box-shadow: 0 0 6px rgba(0, 159, 212, .4);
}

.meetup-mm-dot.cool {
  background: #6b8fd4;
  box-shadow: 0 0 4px rgba(107, 143, 212, .3);
}

#meetup-map-legend {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.meetup-legend-item {
  font-size: .6rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}

.meetup-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.meetup-dot.hot { background: #ff6b3d; }
.meetup-dot.warm { background: var(--accent-2); }
.meetup-dot.cool { background: #6b8fd4; }

/* ─── Cluster detail drawer ─── */
#meetup-cluster-detail {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#meetup-cluster-detail.hidden {
  display: none;
}

#meetup-cluster-hdr {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#meetup-cluster-back {
  padding: 5px 12px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: .7rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}

#meetup-cluster-back:hover {
  border-color: var(--accent-2);
  color: var(--accent-2);
}

#meetup-cluster-title {
  flex: 1;
  font-size: .82rem;
  font-weight: 700;
}

#meetup-cluster-papers {
  flex: 1;
  overflow-y: auto;
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#meetup-cluster-papers::-webkit-scrollbar {
  width: 4px;
}

#meetup-cluster-papers::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.meetup-paper-card {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  transition: background .15s;
}

.meetup-paper-card:hover {
  background: rgba(44, 78, 138, .4);
}

.meetup-paper-title {
  font-size: .73rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 4px;
}

.meetup-paper-authors {
  font-size: .62rem;
  color: var(--text-dim);
  margin-bottom: 5px;
  line-height: 1.3;
}

.meetup-paper-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.meetup-paper-tag {
  font-size: .58rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(44, 78, 138, .4);
  color: var(--text-dim);
}

.meetup-paper-add-btn {
  margin-left: auto;
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid rgba(0, 159, 212, .4);
  background: rgba(0, 159, 212, .1);
  color: var(--accent-2);
  font-size: .62rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}

.meetup-paper-add-btn:hover {
  background: rgba(0, 159, 212, .22);
}

.meetup-paper-add-btn.added {
  border-color: rgba(100, 200, 100, .4);
  background: rgba(100, 200, 100, .1);
  color: #7dc87d;
  cursor: default;
}

/* ─── Cluster actions ─── */
#meetup-cluster-actions {
  display: flex;
  gap: 10px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

#meetup-add-cluster-btn {
  flex: 1;
  padding: 9px 16px;
  border-radius: 10px;
  border: 1px solid rgba(0, 159, 212, .4);
  background: rgba(0, 159, 212, .12);
  color: var(--accent-2);
  font-size: .78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .15s;
}

#meetup-add-cluster-btn:hover {
  background: rgba(0, 159, 212, .22);
}

#meetup-navigate-btn {
  padding: 9px 16px;
  border-radius: 10px;
  border: none;
  background: var(--accent-2);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .15s;
}

#meetup-navigate-btn:hover {
  background: #0089b8;
  box-shadow: 0 4px 14px rgba(0, 159, 212, .4);
}

/* ─── Empty state ─── */
.meetup-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-dim);
  font-size: .78rem;
}

.meetup-empty-icon {
  font-size: 2rem;
  margin-bottom: 8px;
  display: block;
}

/* ─── Responsive ─── */
@media (max-width: 700px) {
  #meetup-body {
    flex-direction: column;
  }
  #meetup-map-col {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 160px;
    flex-direction: row;
    padding: 8px 12px;
  }
  #meetup-minimap {
    min-height: 120px;
  }
  #meetup-panel {
    max-height: 95vh;
  }
}