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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-overlay: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --border: #30363d;
  --border-dim: #21262d;
  --accent: #d57455;
  --blue: #1f6feb;
  --sidebar-width: 260px;
  --panel-width: 340px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
}

/* ── Layout ────────────────────────────────── */
.app-container {
  display: flex;
  height: 100vh;
}

/* ── Sidebar ───────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  height: 100vh;
  overflow: hidden;
}

.sidebar-header {
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  height: 56px;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon { font-size: 20px; }
.logo-text { font-size: 15px; font-weight: 700; color: var(--text-primary); }

.sidebar-section-title {
  padding: 14px 20px 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 4px 10px;
}

.sidebar-loading {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 10px;
  color: var(--text-muted);
  font-size: 13px;
}

/* Session cards in sidebar */
.session-card {
  display: block;
  width: 100%;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 4px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.session-card:hover {
  background: var(--bg-overlay);
  border-color: var(--border);
  color: var(--text-primary);
}

.session-card.active {
  background: rgba(31, 111, 235, 0.15);
  border-color: var(--blue);
  color: var(--text-primary);
}

.session-card-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 3px;
  color: inherit;
}

.session-card-detail {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.session-card.active .session-card-detail { color: var(--text-secondary); }

/* Sidebar footer */
.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--bg-primary);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.15s;
  border: 1px solid transparent;
}

.sidebar-link:hover {
  background: var(--bg-overlay);
  color: var(--text-primary);
  border-color: var(--border);
}

.link-icon { font-size: 15px; flex-shrink: 0; }

/* ── Main content ──────────────────────────── */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Top bar */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
  height: 56px;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.page-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  font-weight: 400;
}

/* ── Content area (flow + detail panel) ────── */
.content-area {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* ── Flow container ────────────────────────── */
.flow-container {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: margin-right 0.25s ease;
}

.empty-state {
  color: var(--text-muted);
  font-size: 13px;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}
.loading-state {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 13px;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── SVG Flow ──────────────────────────────── */
.flow-svg { max-width: 100%; max-height: 100%; }

.flow-node { cursor: pointer; }
.flow-node rect { transition: all 0.15s; }
.flow-node:hover rect { filter: brightness(1.3); stroke: var(--text-primary); stroke-width: 2; }
.flow-node.dimmed rect { opacity: 0.2; }
.flow-node.dimmed text { opacity: 0.2; }
.flow-node.selected rect { stroke: var(--text-primary); stroke-width: 2.5; filter: brightness(1.2); }

.tree-edge { transition: opacity 0.15s; }
.tree-edge.dimmed { opacity: 0.06; }

.comm-edge { transition: all 0.15s; }
.comm-edge.highlighted { stroke-opacity: 1 !important; stroke-width: 2.5 !important; }
.comm-edge.dimmed { stroke-opacity: 0.05 !important; }

/* ── Detail Panel (right side) ─────────────── */
.detail-panel {
  width: 0;
  min-width: 0;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.25s ease, min-width 0.25s ease;
  flex-shrink: 0;
}

.detail-panel.open {
  width: var(--panel-width);
  min-width: var(--panel-width);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-title {
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.panel-close {
  background: none;
  border: 1px solid transparent;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.panel-close:hover {
  background: var(--bg-overlay);
  border-color: var(--border);
  color: var(--text-primary);
}

.panel-meta {
  padding: 12px 16px;
  font-size: 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-dim);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  flex-shrink: 0;
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

/* ── Accordion ─────────────────────────────── */
.accordion {
  border-bottom: 1px solid var(--border-dim);
}

.accordion-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  transition: all 0.15s;
  user-select: none;
}

.accordion-header:hover {
  background: var(--bg-overlay);
  color: var(--text-primary);
}

.accordion-chevron {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.accordion.open .accordion-chevron {
  transform: rotate(90deg);
}

.accordion-count {
  margin-left: auto;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.accordion-body {
  display: none;
  padding: 0 16px 12px;
}

.accordion.open .accordion-body {
  display: block;
}

/* ── Panel content items ───────────────────── */
.interaction-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 12px;
  color: var(--text-primary);
}

.interaction-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.interaction-name {
  font-weight: 600;
}

.interaction-count {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.comm-item {
  padding: 6px 0;
  border-bottom: 1px solid var(--border-dim);
}

.comm-item:last-child {
  border-bottom: none;
}

.comm-direction {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.comm-agent {
  font-weight: 600;
}

.comm-preview {
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.comm-type-badge {
  display: inline-block;
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--bg-overlay);
  color: var(--text-muted);
  margin-left: 6px;
}

.task-item {
  font-size: 12px;
  color: var(--text-primary);
  padding: 5px 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.task-status { font-size: 11px; flex-shrink: 0; }
.status-completed { color: #3fb950; }
.status-in_progress { color: #d29922; }
.status-pending { color: var(--text-muted); }

.task-subject {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tool-badge {
  display: inline-block;
  background: var(--bg-overlay);
  color: var(--text-secondary);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 11px;
  margin: 2px;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.empty-section {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
  padding: 4px 0;
}

.comm-item.has-popup { cursor: default; }
.comm-item.has-popup:hover { background: var(--bg-overlay); border-radius: 4px; }

/* ── Message popup ─────────────────────────── */
.message-popup {
  display: none;
  position: fixed;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  max-width: 380px;
  max-height: 280px;
  overflow-y: auto;
  z-index: 300;
  pointer-events: none;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-primary);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.message-popup.visible { display: block; }

.no-sessions { color: var(--text-muted); font-size: 13px; padding: 12px; }