/**
 * LibZen Panel — column panels, nested cards, lists, horizontal stack.
 * Theme tokens: --libzen-panel, --libzen-surface, --libzen-border, --libzen-accent, etc.
 */

:root {
  --libzen-panel: var(--panel, #1a2332);
  --libzen-surface: var(--surface, #243044);
  --libzen-surface-hover: var(--surface-hover, #2a3850);
  --libzen-bg: var(--bg, #151c28);
  --libzen-border: var(--border, #2d3a4f);
  --libzen-text: var(--text, #e2e8f0);
  --libzen-text-muted: var(--text-muted, #94a3b8);
  --libzen-highlight: var(--highlight, #f1f5f9);
  --libzen-accent: var(--accent, #3b82f6);
}

/* —— Workspace: main slot (map) + panel stack —— */
.libzen-pn-workspace {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  --libzen-main-min-width: 200px;
}

.libzen-pn-main-slot {
  flex: 1 1 0;
  min-width: var(--libzen-main-min-width, 200px);
  position: relative;
  overflow: hidden;
}

.libzen-pn-stack-host {
  flex: 0 0 auto;
  height: 100%;
  display: flex;
  overflow: hidden;
}

/* —— Horizontal stack —— */
.libzen-pn-stack {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  height: 100%;
  flex-shrink: 0;
  position: relative;
}

.libzen-pn-stack-unit {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  height: 100%;
  flex-shrink: 0;
}

.libzen-pn-stack-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  flex-shrink: 0;
  overflow: hidden;
}

.libzen-pn-stack-panel > .libzen-pn-panel {
  flex: 1;
  width: 100%;
  min-width: 0;
}

.libzen-pn-resize-handle {
  position: relative;
  flex: 0 0 6px;
  width: 6px;
  cursor: col-resize;
  touch-action: none;
  z-index: 20;
  background: transparent;
}

.libzen-pn-resize-handle::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 2px;
  width: 2px;
  background: transparent;
  transition: background 0.15s;
  pointer-events: none;
}

.libzen-pn-resize-handle:hover::after,
.libzen-pn-resize-handle.libzen-pn-resize-handle-active::after {
  background: var(--libzen-accent);
}

body.libzen-pn-resize-active {
  cursor: col-resize;
  user-select: none;
}

/* —— Column panel —— */
.libzen-pn-panel {
  background: var(--libzen-panel);
  border-left: 1px solid var(--libzen-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: 100%;
  color: var(--libzen-text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.libzen-pn-panel-header {
  padding: 16px;
  border-bottom: 1px solid var(--libzen-border);
  flex-shrink: 0;
}

.libzen-pn-panel-header-collapsed {
  padding: 10px 16px;
}

.libzen-pn-panel-header-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
}

.libzen-pn-panel-header-collapsed .libzen-pn-panel-header-row {
  margin-bottom: 0;
}

.libzen-pn-panel-header-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  min-width: 0;
  padding: 0;
  background: transparent;
  border: none;
  text-align: left;
  gap: 8px;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.libzen-pn-panel-header-toggle:hover {
  background: transparent;
}

.libzen-pn-panel-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  color: var(--libzen-highlight);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.libzen-pn-panel-header-collapsed .libzen-pn-panel-title {
  font-size: 16px;
}

.libzen-pn-panel-collapsed .libzen-pn-panel-toolbar,
.libzen-pn-panel-collapsed .libzen-pn-panel-scroll {
  display: none;
}

.libzen-pn-panel-drag-handle {
  cursor: grab;
  color: var(--libzen-text-muted);
  font-size: 16px;
  padding: 4px;
  user-select: none;
  flex-shrink: 0;
}

.libzen-pn-panel-drag-handle:active {
  cursor: grabbing;
}

.libzen-pn-panel-toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.libzen-pn-panel-toolbar[hidden] {
  display: none;
}

.libzen-pn-panel-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

/* —— Nested card panel —— */
.libzen-pn-card {
  position: relative;
  width: 100%;
  box-sizing: border-box;
  background: var(--libzen-bg);
  border: 1px solid var(--libzen-border);
  border-radius: 10px;
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s, opacity 0.15s;
}

.libzen-pn-card-unchecked {
  opacity: 0.55;
}

.libzen-pn-card-unchecked .libzen-pn-card-header {
  opacity: 0.85;
}

.libzen-pn-card-drop-before,
.libzen-pn-card-drop-after {
  border-color: var(--libzen-accent);
}

.libzen-pn-card-drop-before::before,
.libzen-pn-card-drop-after::after {
  content: '';
  position: absolute;
  left: 10px;
  right: 10px;
  height: 3px;
  background: var(--libzen-accent);
  border-radius: 2px;
  pointer-events: none;
  z-index: 2;
}

.libzen-pn-card-drop-before::before {
  top: 0;
}

.libzen-pn-card-drop-after::after {
  bottom: 0;
}

.libzen-pn-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  user-select: none;
  background: var(--libzen-surface);
}

.libzen-pn-card-header:hover {
  background: var(--libzen-surface-hover);
}

.libzen-pn-card-header-text {
  flex: 1;
  min-width: 0;
  width: 100%;
}

.libzen-pn-card-header-trailing {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex-shrink: 0;
}

.libzen-pn-card-grip,
.libzen-pn-list-grip {
  color: var(--libzen-text-muted);
  font-size: 14px;
  line-height: 1;
  cursor: grab;
  flex-shrink: 0;
  padding: 2px;
}

.libzen-pn-card-grip:active,
.libzen-pn-list-grip:active {
  cursor: grabbing;
}

.libzen-pn-card-title {
  font-weight: 600;
  font-size: 14px;
}

.libzen-pn-card-leading-slot {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

/* Second-row / expanded-body summary (e.g. leg drive · distance · stop). */
.libzen-pn-card-summary {
  margin: 0;
  font-size: 12px;
  color: var(--libzen-text-muted);
  font-variant-numeric: tabular-nums;
  line-height: 1.35;
}

.libzen-pn-card-body {
  padding: 12px;
  border-top: 1px solid var(--libzen-border);
  /* Match inset content areas (drop zones, lists) — not page --bg. */
  background: var(--libzen-surface);
}

.libzen-pn-card-body[hidden] {
  display: none;
}

.libzen-pn-card-title[hidden],
.libzen-pn-card-oneline[hidden] {
  display: none !important;
}

/* Nested cards inside a parent body (e.g. itinerary legs in a trip section). */
.libzen-pn-card-body-host {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.libzen-pn-card-body-host > .libzen-pn-card {
  margin-bottom: 0;
  background: transparent;
  border-color: var(--libzen-border);
}

.libzen-pn-card-body-host > .libzen-pn-card .libzen-pn-card-header {
  background: transparent;
}

.libzen-pn-card-body-host > .libzen-pn-card .libzen-pn-card-header:hover {
  background: var(--libzen-surface-hover);
}

.libzen-pn-card-body-host > .libzen-pn-card .libzen-pn-card-body {
  background: transparent;
}

.libzen-pn-card-body-host > .libzen-pn-card:not(.libzen-pn-card-collapsed) > .libzen-pn-card-body {
  padding: 8px 12px;
}

.libzen-pn-card-body-host > .libzen-pn-card:last-child {
  margin-bottom: 0;
}

.libzen-pn-card-collapsed .libzen-pn-card-header {
  padding-top: 6px;
  padding-bottom: 6px;
}

.libzen-pn-checkbox-row input {
  cursor: pointer;
  accent-color: var(--libzen-accent);
}

.libzen-pn-collapse-chevron {
  display: inline-block;
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-right: 2px solid var(--libzen-text-muted);
  border-bottom: 2px solid var(--libzen-text-muted);
  transform: rotate(45deg);
  margin-top: -3px;
  transition: transform 0.15s ease;
}

.libzen-pn-collapse-chevron.libzen-pn-is-collapsed {
  transform: rotate(-45deg);
  margin-top: 0;
  margin-left: 1px;
}

.libzen-pn-card-header-trailing .libzen-pn-collapse-chevron {
  width: 10px;
  height: 10px;
  border-color: var(--libzen-text);
  opacity: 0.85;
}

.libzen-pn-card-oneline {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.libzen-pn-card-oneline-title {
  flex-shrink: 0;
  font-weight: 600;
  font-size: 13px;
}

.libzen-pn-card-oneline-sep {
  flex-shrink: 0;
  color: var(--libzen-text-muted);
  font-size: 12px;
}

.libzen-pn-card-oneline-route {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 12px;
  color: var(--libzen-text-muted);
}

.libzen-pn-card-selected {
  border-color: var(--libzen-accent);
  box-shadow: 0 0 0 1px var(--libzen-accent);
}

/* —— Form helpers inside panel body —— */
.libzen-pn-field-label {
  display: block;
  font-size: 11px;
  color: var(--libzen-text-muted);
  margin-bottom: 4px;
}

.libzen-pn-field-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.libzen-pn-field-row input[type='text'] {
  flex: 1;
  min-width: 0;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--libzen-border);
  border-radius: 6px;
  background: var(--libzen-bg);
  color: var(--libzen-text);
  font: inherit;
  box-sizing: border-box;
}

.libzen-pn-field-row input:focus {
  outline: none;
  border-color: var(--libzen-accent);
}

.libzen-pn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border: none;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  box-sizing: border-box;
}

.libzen-pn-btn-primary {
  width: 100%;
  background: var(--libzen-accent);
  color: #fff;
  margin-bottom: 12px;
}

.libzen-pn-btn-primary:hover {
  filter: brightness(1.08);
}

.libzen-pn-btn-icon {
  min-width: 36px;
  height: 34px;
  padding: 0;
  background: var(--libzen-surface);
  border: 1px solid var(--libzen-border);
  color: var(--libzen-text);
}

.libzen-pn-btn-icon:hover {
  background: var(--libzen-surface-hover);
}

/* —— Reorderable list rows —— */
.libzen-pn-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.libzen-pn-list-dashed {
  border: 2px dashed var(--libzen-border);
  border-radius: 8px;
  padding: 8px;
}

.libzen-pn-list-empty {
  font-size: 12px;
  color: var(--libzen-text-muted);
  margin: 0;
  text-align: center;
}

.libzen-pn-list-row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--libzen-surface);
  border: 1px solid var(--libzen-border);
  border-radius: 8px;
  padding: 8px 10px;
}

.libzen-pn-list-row-content {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.libzen-pn-list-row-label {
  font-weight: 500;
  font-size: 13px;
}

.libzen-pn-list-row-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.libzen-pn-list-row-actions button {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  font-size: 14px;
  opacity: 0.85;
}

.libzen-pn-list-row-actions button:hover {
  opacity: 1;
}

.libzen-pn-list-drop-before,
.libzen-pn-list-drop-after {
  border-color: var(--libzen-accent);
}

.libzen-pn-list-drop-before::before,
.libzen-pn-list-drop-after::after {
  content: '';
  position: absolute;
  left: 8px;
  right: 8px;
  height: 2px;
  background: var(--libzen-accent);
  border-radius: 1px;
  pointer-events: none;
}

.libzen-pn-list-drop-before::before {
  top: -1px;
}

.libzen-pn-list-drop-after::after {
  bottom: -1px;
}