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

body {
  font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  background: #e8ecf0;
  color: #2c3e50;
  overflow: hidden;
  height: 100vh;
}

#app {
  display: flex;
  height: 100vh;
  flex-direction: column;
}

/* ─── Header ─── */
header {
  background: linear-gradient(135deg, #d5dbe3 0%, #e8ecf0 100%);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #b0b8c0;
  z-index: 10;
  flex-shrink: 0;
}

header h1 {
  font-size: 18px;
  font-weight: 600;
  background: linear-gradient(90deg, #2c3e50, #34495e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

#controls {
  display: flex;
  gap: 16px;
  align-items: center;
}

#controls label {
  font-size: 13px;
  color: #5a6a7a;
}

#controls select, #controls input {
  background: #f5f7f9;
  color: #2c3e50;
  border: 1px solid #b0b8c0;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
}

#controls select[multiple] {
  height: 28px;
}

/* ─── Main Layout ─── */
#main {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ─── Visualization ─── */
#vis-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#vis-container svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ─── Detail Panel ─── */
#detail-panel {
  width: 0;
  background: #f0f2f5;
  border-left: 1px solid #b0b8c0;
  overflow-y: auto;
  transition: width 0.3s ease;
  flex-shrink: 0;
}

#detail-panel h2 {
  font-size: 16px;
  margin-bottom: 16px;
  color: #2c3e50;
}

#detail-panel .field-label {
  color: #7f8c8d;
  display: inline-block;
  min-width: 80px;
}

#detail-panel .field-value {
  color: #8e44ad;
}

#detail-panel .close-btn {
  float: right;
  background: none;
  border: none;
  color: #7f8c8d;
  cursor: pointer;
  font-size: 18px;
}

#detail-panel .close-btn:hover {
  color: #2c3e50;
}

#detail-panel.open {
  width: 380px;
  padding: 20px;
}

#detail-panel h2 {
  font-size: 16px;
  margin-bottom: 16px;
  color: #64b5f6;
}

#detail-panel .field {
  margin-bottom: 10px;
  font-size: 13px;
  line-height: 1.6;
}

#detail-panel .field-label {
  color: #8a9bb5;
  display: inline-block;
  min-width: 80px;
}

#detail-panel .field-value {
  color: #8e44ad;
}

#detail-panel .close-btn {
  float: right;
  background: none;
  border: none;
  color: #8a9bb5;
  cursor: pointer;
  font-size: 18px;
}

#detail-panel .close-btn:hover {
  color: #e0e6ed;
}

/* ─── Tooltip ─── */
.tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid #b0b8c0;
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.5;
  z-index: 100;
  max-width: 350px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.tooltip .tt-title {
  font-size: 14px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 6px;
}

.tooltip .tt-label {
  color: #7f8c8d;
  min-width: 60px;
}

.tooltip .tt-value {
  color: #2c3e50;
}

.tooltip .tt-title {
  font-size: 14px;
  font-weight: 600;
  color: #64b5f6;
  margin-bottom: 6px;
}

.tooltip .tt-row {
  display: flex;
  gap: 6px;
  margin-bottom: 3px;
}

.tooltip .tt-label {
  color: #8a9bb5;
  min-width: 60px;
}

.tooltip .tt-value {
  color: #e0e6ed;
}

/* ─── Search Panel (左上) ─── */
#search-panel {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 30;
  background: rgba(240, 242, 245, 0.92);
  border: 1px solid #b0b8c0;
  border-radius: 6px;
  padding: 10px 12px;
  z-index: 20;
  min-width: 220px;
  max-width: 260px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
#search-panel .sp-header {
  font-size: 12px;
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 6px;
}
#search-panel .sp-row {
  margin-bottom: 4px;
}
#search-panel .sp-row select {
  width: 100%;
  font-size: 11px;
  padding: 3px 6px;
  border: 1px solid #c0c8d0;
  border-radius: 3px;
  background: #f8f9fb;
  color: #2c3e50;
}
#search-panel .sp-row input {
  width: 100%;
  font-size: 11px;
  padding: 3px 6px;
  border: 1px solid #c0c8d0;
  border-radius: 3px;
  background: #f8f9fb;
  color: #2c3e50;
  outline: none;
}
#search-panel .sp-row input:focus,
#search-panel .sp-row select:focus {
  border-color: #42a5f5;
}
#search-panel .sp-count {
  font-size: 10px;
  color: #7f8c8d;
  margin: 4px 0;
}
#search-panel .sp-list {
  max-height: 260px;
  overflow-y: auto;
  font-size: 11px;
}
#search-panel .sp-list .sp-item {
  padding: 4px 6px;
  cursor: pointer;
  border-radius: 3px;
  border-bottom: 1px solid #e8ecf0;
  line-height: 1.4;
  color: #2c3e50;
}
#search-panel .sp-list .sp-item:hover {
  background: #d5e8f5;
}
#search-panel .sp-list .sp-item .sp-item-name {
  font-weight: 500;
}
#search-panel .sp-list .sp-item .sp-item-meta {
  font-size: 10px;
  color: #7f8c8d;
}

/* ─── Legend ─── */
#legend {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #b0b8c0;
  border-radius: 6px;
  padding: 12px 16px;
  z-index: 10;
}

#legend .legend-title {
  font-size: 12px;
  color: #7f8c8d;
  margin-bottom: 8px;
}

#legend .legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 12px;
  cursor: pointer;
  color: #2c3e50;
}

#legend .legend-item:hover {
  color: #2980b9;
}

#legend .legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

#legend .legend-color.gender-m { background: #4A90D9; border-radius: 50%; width: 10px; height: 10px; }
#legend .legend-color.gender-f { background: #E87461; border-radius: 50%; width: 10px; height: 10px; }
#legend .legend-color.gender-u { background: #AAAAAA; border-radius: 50%; width: 10px; height: 10px; }

/* ─── Category toggle buttons ─── */
.cat-toggle {
  background: rgba(26, 42, 58, 0.8);
  color: #8a9bb5;
  border: 1px solid #2a3a4a;
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.cat-toggle.active {
  background: #2a3a4a;
  color: #64b5f6;
  border-color: #64b5f6;
}

.cat-toggle:hover {
  background: #2a3a4a;
}

/* ─── Stats bar ─── */
#stats-bar {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 12px;
  color: #5a6a7a;
  z-index: 10;
  text-align: right;
  line-height: 1.8;
}

/* ─── Time range slider ─── */
.slider-container {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #b0b8c0;
  border-radius: 6px;
  padding: 12px 20px;
  z-index: 10;
  min-width: 200px;
}

.slider-container label {
  font-size: 12px;
  color: #7f8c8d;
  display: block;
  margin-bottom: 6px;
}

.slider-container input[type=range] {
  width: 100%;
  margin: 4px 0;
  -webkit-appearance: none;
  background: transparent;
}

.slider-container input[type=range]::-webkit-slider-runnable-track {
  height: 4px;
  background: #2a3a4a;
  border-radius: 2px;
}

.slider-container input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #42a5f5;
  margin-top: -5px;
  cursor: pointer;
}

.slider-values {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: #5a7a9a;
}