*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d1117;
  --surface: #111827;
  --border: #1f2937;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --sidebar-width: 220px;
}

html, body { height: 100%; background: var(--bg); color: var(--text); font-family: system-ui, sans-serif; font-size: 13px; }

#app { display: flex; height: 100vh; }

#sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
}

#sidebar > div { padding: 12px; border-bottom: 1px solid var(--border); }

.section-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 10px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

#search {
  width: 100%;
  background: #1f2937;
  border: 1px solid #374151;
  border-radius: 4px;
  padding: 5px 8px;
  color: var(--text);
  font-size: 12px;
  outline: none;
}
#search:focus { border-color: #4b5563; }

#filter-chips { display: flex; flex-wrap: wrap; gap: 4px; }

.chip {
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 10px;
  cursor: pointer;
  border: 1px solid transparent;
  user-select: none;
  transition: opacity 0.15s;
}
.chip.off { opacity: 0.35; }

.community-entry {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  margin-bottom: 2px;
  transition: background 0.15s;
}
.community-entry:hover { background: #1f2937; }
.community-entry.active { background: #1f2937; }

.community-swatch { width: 10px; height: 10px; border-radius: 2px; flex-shrink: 0; }
.community-name { flex: 1; }
.community-count { color: var(--text-dim); font-size: 10px; }

.legend-entry { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }
.legend-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

#graph-container { flex: 1; position: relative; overflow: hidden; }
#graph { width: 100%; height: 100%; }

#error-message {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--text-muted);
  text-align: center;
  font-size: 14px;
}

#tooltip {
  position: fixed;
  background: #1f2937;
  border: 1px solid #374151;
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 12px;
  pointer-events: none;
  display: none;
  max-width: 220px;
  z-index: 100;
}
#tooltip .tt-name { font-weight: 600; margin-bottom: 4px; }
#tooltip .tt-row { color: var(--text-muted); margin-bottom: 2px; }
#tooltip .tt-neighbors { color: var(--text-dim); margin-top: 6px; font-size: 11px; line-height: 1.4; }