:root {
  --sidebar-w: 279px;
  --bg: #f1f5f9;
  --panel: #fff;
  --border: rgba(148, 163, 184, 0.28);
  --text: #0f172a;
  --muted: #64748b;
  --green-dark: #166534;
  --green-mid: #22c55e;
  --green-light: #86efac;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.demo-top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.demo-top h1 { margin: 0; font-size: 14px; font-weight: 700; }
.demo-top p { margin: 2px 0 0; font-size: 12px; color: var(--muted); }
.demo-top a { font-size: 12px; font-weight: 600; color: #166534; text-decoration: none; }

.demo-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 16px 40px;
}

.sidebar-mock {
  width: var(--sidebar-w);
  height: min(560px, calc(100vh - 120px));
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
  font-size: 12px;
}

.ctx-agent-fade {
  flex: 0 0 auto;
  height: 48px;
  background: linear-gradient(135deg, #fde68a 0%, #fbbf24 55%, #fcd34d 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
}

.ctx-agent-fade::after {
  content: "↑ NOTE.md band";
  position: absolute;
  left: 10px;
  bottom: 6px;
  font-size: 9px;
  font-weight: 600;
  color: rgba(120, 53, 15, 0.75);
}

/* ── production-like tree band ── */

.tree-band {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
}

.tree-band-head {
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-mid) 52%, var(--green-light) 100%);
}

.tree-band-toggle {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 9px 12px;
  border: 0;
  background: transparent;
  color: #f0fdf4;
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}

.tree-band-toggle .chevron {
  width: 7px;
  height: 7px;
  border-right: 2px solid rgba(255, 255, 255, 0.95);
  border-bottom: 2px solid rgba(255, 255, 255, 0.95);
  transform: rotate(45deg);
  margin-top: -3px;
  flex-shrink: 0;
}

.tree-band-head-actions {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 7px 8px 7px 0;
}

.head-btn {
  width: 22px;
  height: 22px;
  min-height: 22px;
  flex: 0 0 22px;
  border: 1px solid rgba(22, 101, 52, 0.28);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.42);
  color: #14532d;
  font-size: 10px;
  line-height: 1;
  padding: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.head-btn:hover { background: rgba(255, 255, 255, 0.72); }
.head-btn.is-active {
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.28);
}

.head-btn svg {
  width: 13px;
  height: 13px;
  display: block;
}

.tree-band-panel {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 6px 10px 0;
  background: linear-gradient(
    180deg,
    rgba(134, 239, 172, 0.42) 0%,
    rgba(240, 253, 244, 0.88) 18%,
    rgba(236, 253, 245, 0.42) 62%,
    rgba(255, 255, 255, 0) 100%
  );
}

.panel-zone { flex: 0 0 auto; }

.index-row {
  display: flex;
  align-items: stretch;
  gap: 6px;
}

.index-open {
  flex: 1 1 auto;
  min-width: 0;
  height: 32px;
  padding: 0 10px;
  border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 8px;
  background: #fff;
  color: #166534;
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}

.index-refresh {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 8px;
  background: #fff;
  color: #166534;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  height: 32px;
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid rgba(34, 197, 94, 0.32);
  border-radius: 8px;
  background: #fff;
}

.search-bar:focus-within {
  border-color: #22c55e;
  box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.14);
}

.search-input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 12px;
  outline: none;
}

.search-input::placeholder { color: #94a3b8; }
.search-icon { color: #94a3b8; font-size: 12px; flex-shrink: 0; }

.view-cluster {
  display: flex;
  align-items: stretch;
  height: 28px;
  min-height: 28px;
  border: 1px solid rgba(34, 197, 94, 0.32);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}

.view-btn {
  flex: 1 1 0;
  min-width: 0;
  border: 0;
  background: transparent;
  color: #166534;
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.view-btn + .view-btn { border-left: 1px solid rgba(34, 197, 94, 0.22); }
.view-btn.is-active { background: #dcfce7; color: #15803d; }

.view-cluster--compact {
  height: 22px;
  min-height: 22px;
  border-radius: 4px;
  flex: 0 0 auto;
}

.view-cluster--compact .view-btn {
  width: 22px;
  flex: 0 0 22px;
  font-size: 10px;
}

.view-cluster--compact .view-btn + .view-btn { border-left-width: 1px; }

.panel-tree-wrap {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-tree {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  padding: 12px 10px 10px 12px;
  background: #fff;
  font-family: Tahoma, "Segoe UI", sans-serif;
}

.panel-tree ul { list-style: none; margin: 0; padding: 0; }
.panel-tree li ul { padding-left: 14px; }

.panel-tree-node {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 24px;
  padding: 1px 4px;
  color: #000;
  font-size: 12px;
}

.panel-tree-node.is-active { background: #316ac5; color: #fff; }

.panel-tree-toggle {
  width: 12px;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  padding: 0;
  font-size: 10px;
}

.panel-tree-badge { margin-left: auto; font-size: 10px; }

.panel-hint {
  margin: 4px 10px 0;
  font-size: 10px;
  color: var(--muted);
  line-height: 1.35;
}

.size-badge {
  margin: 0;
  padding: 6px 10px;
  border-radius: 999px;
  background: #f0fdf4;
  border: 1px solid rgba(34, 197, 94, 0.35);
  color: #166534;
  font-size: 11px;
  font-weight: 600;
}

/* variant helpers */

.v-head-modes { margin-right: 2px; }

.v-title-modes {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 8px 7px 0;
}

.v-title-modes .view-cluster--compact { margin-left: auto; }

.v-search-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.v-search-row .search-bar { flex: 1 1 auto; min-width: 0; }

.v-ghost-tools {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 2px 0 0;
}

.v-ghost-btn {
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 6px;
  cursor: pointer;
}

.v-ghost-btn.is-active {
  color: #166534;
  background: rgba(255, 255, 255, 0.65);
  box-shadow: inset 0 -2px 0 #22c55e;
}

.v-settings-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 32px;
  padding: 0 10px;
  border: 1px dashed rgba(34, 197, 94, 0.4);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 11px;
  color: #475569;
}

.v-settings-chip strong { color: #166534; }

.v-settings-popover {
  margin-top: 6px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
}

.v-settings-popover-title {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 700;
}

.v-settings-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  margin-bottom: 6px;
}

.v-mode-dropdown { position: relative; flex: 0 0 auto; }

.v-mode-dropdown-btn {
  height: 32px;
  padding: 0 10px;
  border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 8px;
  background: #fff;
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  color: #166534;
  cursor: pointer;
  white-space: nowrap;
}

.v-mode-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 5;
  min-width: 140px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
  display: none;
}

.v-mode-dropdown.is-open .v-mode-dropdown-menu { display: block; }

.v-mode-dropdown-item {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  text-align: left;
  padding: 6px 8px;
  font: inherit;
  font-size: 11px;
  border-radius: 6px;
  cursor: pointer;
}

.v-mode-dropdown-item.is-active,
.v-mode-dropdown-item:hover { background: #f0fdf4; color: #166534; }

.v-text-tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
}

.v-text-tab {
  border: 0;
  background: transparent;
  padding: 4px 8px;
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  color: #64748b;
  border-radius: 6px;
  cursor: pointer;
}

.v-text-tab.is-active { color: #166534; background: rgba(255, 255, 255, 0.75); }

.v-tree-toolbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 10px 0;
  background: linear-gradient(180deg, rgba(240, 253, 244, 0.5) 0%, #fff 100%);
}

.v-hover-panel { position: relative; }

.v-hover-panel .v-hover-tools {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.2s ease, opacity 0.15s ease;
}

.v-hover-panel:hover .v-hover-tools,
.v-hover-panel:focus-within .v-hover-tools {
  max-height: 40px;
  opacity: 1;
}

.sidebar-footer {
  flex: 0 0 auto;
  border-top: 1px solid var(--border);
  padding: 8px 10px;
  background: #f8fafc;
}

.sidebar-footer-label {
  margin: 0 0 6px;
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #94a3b8;
}

.sidebar-footer .view-cluster { height: 28px; }