/* 样式表 */
body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: #f0f2f5;
  margin: 0;
  padding: 30px 20px 60px;
}

.container {
  max-width: 1100px;
  margin: auto;
  position: relative;
}

.timeline-note {
  margin: 10px 4px 0;
  font-size: 12px;
  color: #7f8897;
  line-height: 1.4;
}

.timeline-note a {
  color: inherit;
  text-decoration: underline;
}

.timeline-note a:visited {
  color: inherit;
}

.repo-note {
  position: absolute;
  right: 8px;
  bottom: -4px;
  margin: 0;
  z-index: 30;
}

.repo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  color: #5f6877;
  text-decoration: none;
  transition: transform 0.15s ease, color 0.15s ease;
}

.repo-link:visited {
  color: inherit;
}

.repo-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
  flex-shrink: 0;
}

.repo-link:hover {
  transform: translateY(-1px);
  color: #2e3746;
}

@media (max-width: 640px) {
  .repo-note {
    right: 6px;
    bottom: -2px;
  }
}

h1 {
  text-align: center;
  font-size: 32px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 30px;
  letter-spacing: 4px;
}

/* ── Timeline wrapper ── */
.timeline {
  display: flex;
  flex-direction: column;
  position: relative;
  --axis-line-x: 102px;
  --metric-width: 56px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
  padding-bottom: 22px;
  overflow: hidden;
}

.y-ruler {
  position: absolute;
  left: var(--axis-line-x);
  right: auto;
  width: 12px;
  pointer-events: none;
  z-index: 2;
}

.y-ruler-line {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: #9ea8b5;
}

.y-tick {
  position: absolute;
  right: 0;
  height: 1px;
  background: #b9c1cb;
}

.y-tick.minor {
  width: 4px;
  background: #c3cad3;
}

.y-tick.medium {
  width: 8px;
  background: #8e98a6;
}

.y-tick.major {
  width: 13px;
  background: #111111;
}

/* ── Column widths (shared by header + all rows) ── */
.col-time {
  width: 90px;
  flex-shrink: 0;
  text-align: right;
  padding-right: 18px;
  font-size: 13px;
  color: #888;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.col-label {
  width: 200px;
  flex-shrink: 0;
  padding: 0 10px 0 20px;
  font-size: 14px;
  color: #333;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: 6px;
}

.col-bar {
  flex: 1;
  padding: 0 30px 0 8px;
  position: relative;
}

.axis-col-header {
  padding-left: 8px;
  padding-right: 30px;
}

/* ── Header row ── */
.timeline-header {
  display: flex;
  align-items: flex-end;
  background: #f8f9fb;
  border-bottom: 2px solid #e0e4ea;
  padding: 10px 0 6px;
}

.col-header {
  font-size: 12px;
  font-weight: 600;
  color: #999;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.global-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  transition: color 0.18s ease;
}

.global-toggle-label:hover,
.global-toggle-label:focus-visible {
  color: #58667a;
}

.global-toggle-label:focus-visible {
  outline: none;
}

.global-toggle-text {
  position: relative;
}

.global-toggle-text::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  border-bottom: 1px dashed rgba(88, 102, 122, 0.26);
}

.global-toggle-hint {
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  color: #8e99a9;
  background: #f4f6f8;
  border: 1px solid #e1e6ec;
  border-radius: 999px;
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  white-space: nowrap;
  text-transform: none;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.global-toggle-label:hover .global-toggle-hint,
.global-toggle-label:focus-visible .global-toggle-hint {
  color: #5f6e81;
  border-color: #cfd7e1;
  background: #eef2f6;
}

/* Tick mark ruler in header bar column */
.tick-wrap {
  position: relative;
  height: 34px;
  width: 100%;
  overflow: visible;
}

.tick-label {
  position: absolute;
  transform: translateX(-50%);
  font-size: 11px;
  color: #888;
  top: 0;
  white-space: nowrap;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.3;
}

.tick-label::after {
  content: '';
  display: block;
  width: 1px;
  height: 10px;
  background: #9ea6b0;
  margin-top: 3px;
}

.tick-label.terminal-tick {
  font-weight: 700;
  color: #4d5564;
}

.tick-label.terminal-tick::after {
  width: 2px;
  height: 14px;
  background: #6a7586;
}

.tick-minor {
  position: absolute;
  transform: translateX(-50%);
  top: 20px;
  width: 1px;
  height: 4px;
  background: #c7cdd4;
}

/* ── Rows ── */
.row {
  display: flex;
  align-items: center;
  min-height: 44px;
  transition: background 0.15s;
}

.row .col-label,
.row .col-bar {
  border-bottom: none;
}

.row:hover {
  background: transparent;
}

.dynasty-row {
  min-height: 48px;
  background: transparent;
}

.dynasty-row .col-label,
.dynasty-row .col-bar {
  border-bottom: none;
}

.dynasty-row:hover {
  background: transparent;
}

.subdynasty-row .col-time {
  color: #7f8897;
}

.subdynasty-label {
  padding-left: 34px;
}

.subdynasty-row .dynasty-name-text {
  font-size: 14px;
  font-weight: 600;
  color: #2d3b4f;
}

.emperor-row .col-time {
  font-size: 12px;
  color: #aaa;
}

.emperor-row .col-label {
  padding-left: 34px;
  font-size: 13px;
  color: #555;
}

.marker-row {
  min-height: 36px;
}

.marker-row .col-time,
.marker-row .marker-label {
  color: #6b7380;
  font-weight: 500;
}

.marker-row .col-time {
  font-size: 13px;
}

.bar-cell-inner {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
}

.bar-track-wrap {
  position: relative;
  flex: 1;
  min-width: 0;
}

.bar-value {
  position: absolute;
  top: 50%;
  transform: translate(6px, -50%);
  font-size: 12px;
  color: #5f6877;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  white-space: nowrap;
}

.bar-value.inside {
  transform: translate(calc(-100% - 6px), -50%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

/* ── Labels ── */
.dynasty-name-text {
  font-size: 15px;
  font-weight: 700;
  color: #1a1a2e;
  letter-spacing: 2px;
}

.emperor-label {
  letter-spacing: 0.5px;
}

/* ── Toggle button ── */
.toggle-btn {
  background: none;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  color: #888;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}

.toggle-btn:hover {
  background: #e0e4ea;
  color: #333;
}

/* ── Bar track (the grey rail) ── */
.bar-track {
  position: relative;
  height: 20px;
  background: #eef0f4;
  border-radius: 10px;
  overflow: hidden;
  width: 100%;
}

.dynasty-row .bar-track {
  height: 22px;
}

/* ── Bars ── */
.bar {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  border-radius: 10px;
  transition: filter 0.15s;
}

.bar:hover {
  filter: brightness(1.12);
  cursor: pointer;
}

.dynasty-bar {
  opacity: 0.85;
}

.emperor-bar {
  opacity: 0.72;
}

/* ── Tooltip ── */
.tooltip {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  background: rgba(20, 20, 40, 0.92);
  color: #f0f2f5;
  padding: 12px 14px;
  border-radius: 8px;
  max-width: 300px;
  font-size: 13px;
  line-height: 1.5;
  display: none;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.tooltip h4 {
  margin: 0 0 6px;
  font-size: 15px;
  color: #fff;
}

.tooltip p {
  margin: 4px 0;
}

.tooltip ul {
  padding-left: 16px;
  margin: 4px 0 0;
}

.tooltip li {
  margin-bottom: 2px;
}

/* ── Color palette ── */
.green    { background: #52a447; }
.orange   { background: #d67c2a; }
.purple   { background: #7b52c2; }
.blue     { background: #3574d4; }
.teal     { background: #2a9d8f; }
.yellow   { background: #c89a00; }
.red      { background: #c0392b; }
.gray     { background: #5a6268; }
.darkblue { background: #234b8a; }