:root {
  --paper: #f5f0e8;
  --paper-light: #faf6ee;
  --paper-dark: #e8dcc8;
  --ink-deep: #3a2a18;
  --ink-medium: #4a3728;
  --ink-light: #6a5a48;
  --ink-muted: #8b7355;
  --line: #b8a080;
  --line-light: #c4b08a;
  --border: #c4b08a;
  --accent: #7a9a6a;
  --accent-glow: rgba(122, 154, 106, 0.3);
  --font-family: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --node-width: 30px;
  --node-min-height: 58px;
  --level-gap: 80px;
  --sibling-gap: 4px;
  --connector-width: 1.5px;
}

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

body {
  font-family: var(--font-family);
  background: var(--paper);
  color: var(--ink-deep);
  overflow: hidden;
  height: 100vh;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background: linear-gradient(180deg, var(--paper-dark), var(--paper));
  border-bottom: 2px solid var(--border);
  box-shadow: 0 2px 12px rgba(100, 80, 50, 0.1);
}

.header-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--ink-deep);
}

.header-subtitle {
  font-size: 12px;
  color: var(--ink-muted);
  margin-top: 2px;
  letter-spacing: 1px;
}

.search-input {
  font-family: var(--font-family);
  font-size: 14px;
  width: 200px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--paper-light);
  color: var(--ink-medium);
  outline: none;
}

.search-input::placeholder {
  color: var(--ink-muted);
}

.search-input:focus {
  border-color: var(--ink-light);
  box-shadow: 0 0 0 2px rgba(106, 90, 72, 0.15);
}

.canvas-viewport {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding-top: 64px;
  overflow: hidden;
  cursor: grab;
}

.canvas-viewport.is-dragging {
  cursor: grabbing;
}

.canvas-inner {
  transform-origin: 0 0;
  width: max-content;
  padding: 40px 60px 80px;
}

.tree-node {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.person-card {
  width: var(--node-width);
  min-height: var(--node-min-height);
  background: linear-gradient(135deg, var(--paper-light), var(--paper-dark));
  border: 1.5px solid var(--border);
  border-radius: 4px;
  padding: 6px 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
  position: relative;
  z-index: 1;
}

.person-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink-light);
  box-shadow: 0 4px 12px rgba(100, 80, 50, 0.18);
}

.person-card.is-selected {
  border-color: #4a7a3a;
  background: linear-gradient(135deg, #d6e8c8, #c4dab2);
  box-shadow: 0 0 0 3px rgba(74, 122, 58, 0.4), 0 4px 12px rgba(100, 80, 50, 0.2);
}

.person-card.is-root {
  background: linear-gradient(135deg, var(--paper-dark), #ddd0b8);
  border-width: 2px;
  border-color: #b8a070;
  box-shadow: 0 2px 8px rgba(100, 80, 50, 0.15);
}

.person-card.is-match {
  border-color: #c4564a;
  background: linear-gradient(135deg, #fdf0ee, #f8e4e0);
  box-shadow: 0 0 0 2px rgba(196, 86, 74, 0.25);
}

.person-card.is-dimmed {
  opacity: 0.3;
}

.person-name {
  font-size: 13px;
  font-weight: 700;
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 0.05em;
  line-height: 1;
  white-space: nowrap;
  color: var(--ink-medium);
}

.person-card.is-root .person-name {
  font-size: 14px;
  color: var(--ink-deep);
}

.children {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  padding-top: var(--level-gap);
}

.children > .tree-node {
  margin: 0 calc(var(--sibling-gap) / 2);
}

.children > .tree-node.is-leaf {
  margin: 0 1px;
}

/* Vertical line from parent down to horizontal bar */
.children::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: var(--connector-width);
  height: calc(var(--level-gap) / 2);
  background: var(--line);
}

/* Horizontal bar connecting siblings */
.children::after {
  content: "";
  position: absolute;
  top: calc(var(--level-gap) / 2);
  height: var(--connector-width);
  background: var(--line);
  left: var(--branch-left, 50%);
  right: var(--branch-right, 50%);
}

/* Vertical line from horizontal bar down to each child */
.children > .tree-node::before {
  content: "";
  position: absolute;
  top: calc(var(--level-gap) / -2);
  left: 50%;
  transform: translateX(-50%);
  width: var(--connector-width);
  height: calc(var(--level-gap) / 2);
  background: var(--line);
}

/* Single child: one straight vertical line, no horizontal bar */
.children.is-single::after {
  display: none;
}

.children.is-single::before {
  height: var(--level-gap);
}

.children.is-single > .tree-node::before {
  display: none;
}

/* Root node has no upward connector */
#treeRoot > .tree-node::before {
  display: none;
}

/* --- Header center: detail info (inline with header) --- */
.header-center {
  display: flex;
  align-items: center;
  gap: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
  white-space: nowrap;
}

.header-center.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.detail-name {
  font-size: 30px;
  font-weight: 700;
  color: var(--ink-deep);
  margin-right: 4px;
}

.detail-field {
  font-size: 24px;
  color: var(--ink-medium);
}

.detail-label {
  color: var(--ink-muted);
  margin-right: 2px;
}

.detail-path {
  font-size: 20px;
  color: var(--ink-light);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 400px;
}

.detail-close {
  background: none;
  border: none;
  font-size: 28px;
  color: var(--ink-muted);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 3px;
}

.detail-close:hover {
  background: var(--paper-dark);
  color: var(--ink-deep);
}

/* --- Ancestor path highlighting (cards only) --- */
.tree-node.is-ancestor-path > .person-card {
  border-color: #5a8a4a;
  background: linear-gradient(135deg, #e2eeda, #d4e2c8);
  box-shadow: 0 0 0 2px rgba(90, 138, 74, 0.35);
}

/* --- Tooltip --- */
.path-tooltip {
  position: fixed;
  z-index: 200;
  background: var(--ink-deep);
  color: var(--paper-light);
  padding: 6px 10px;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  pointer-events: none;
  opacity: 0;
  transition: opacity 100ms ease;
  max-width: 420px;
}

.path-tooltip.is-visible {
  opacity: 1;
}

.tooltip-line1 {
  font-size: 18px;
  font-weight: 700;
  white-space: nowrap;
}

.tooltip-line2 {
  font-size: 15px;
  color: var(--line-light);
  margin-top: 2px;
  word-break: break-all;
}

/* --- Search count --- */
.search-count {
  font-size: 12px;
  color: var(--ink-muted);
  margin-right: 8px;
}