/* ===== Design tokens ===== */
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-2: #252836;
  --border: #2e3044;
  --text: #e2e8f0;
  --text-muted: #8892a4;
  --text-dim: #5a6478;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --mtf: #e45756;
  --ftm: #4c78a8;
  --neutral: #72b7b2;
  --positive: #54a24b;
  --negative: #e45756;
  --sidebar-width: 210px;
  --radius: 8px;
  --radius-sm: 4px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100%;
  display: flex;
  font-size: 14px;
  line-height: 1.5;
}

/* ===== Sidebar ===== */
#sidebar {
  width: var(--sidebar-width);
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  z-index: 100;
}

.logo {
  padding: 20px 16px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--border);
  line-height: 1.3;
}

.logo small {
  display: block;
  font-weight: 400;
  color: var(--text-muted);
  font-size: 11px;
  margin-top: 2px;
}

#sidebar nav ul {
  list-style: none;
  padding: 8px 0;
}

#sidebar nav ul li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.15s, background 0.15s;
  border-left: 3px solid transparent;
}

#sidebar nav ul li a:hover {
  color: var(--text);
  background: var(--surface-2);
}

#sidebar nav ul li a.active {
  color: var(--text);
  border-left-color: var(--accent);
  background: var(--surface-2);
}

.nav-icon { font-size: 15px; }

.sidebar-footer {
  margin-top: auto;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ===== Main content ===== */
#content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  overflow-y: auto;
}

.tab { display: none; }
.tab.active { display: block; }

.page-header {
  padding: 28px 32px 20px;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 4px;
}

.page-header p {
  color: var(--text-muted);
  font-size: 13px;
}

.page-body {
  padding: 24px 32px;
}

/* ===== Loading overlay ===== */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

#loading-overlay.hidden { display: none; }

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-msg {
  color: var(--text-muted);
  font-size: 13px;
}

/* ===== Stat cards ===== */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.stat-card .value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-card .label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-card.accent .value { color: var(--accent); }
.stat-card.positive .value { color: var(--positive); }
.stat-card.negative .value { color: var(--negative); }

/* ===== Callout boxes ===== */
.callouts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  border-left: 3px solid var(--border);
}

.callout.finding { border-left-color: var(--accent); }
.callout.caveat  { border-left-color: var(--neutral); }

.callout h3 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.callout p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}

.callout em { color: var(--accent); font-style: normal; font-weight: 600; }

/* ===== Chart panels ===== */
.chart-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}

.chart-panel h3 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.chart-panel .subtitle {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: -8px;
  margin-bottom: 12px;
}

/* ===== Explorer tab ===== */
.explorer-search {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  align-items: center;
}

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-wrap input {
  width: 100%;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

.search-wrap input:focus { border-color: var(--accent); }

.autocomplete-list {
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  max-height: 200px;
  overflow-y: auto;
  z-index: 50;
  display: none;
}

.autocomplete-list.open { display: block; }

.autocomplete-list li {
  padding: 7px 12px;
  cursor: pointer;
  font-size: 13px;
  list-style: none;
}

.autocomplete-list li:hover,
.autocomplete-list li.selected { background: var(--border); }

.explorer-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 16px;
}

.explorer-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stat-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.stat-block h4 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.score-badge {
  display: inline-block;
  font-size: 22px;
  font-weight: 700;
  padding: 4px 0;
}

.score-badge.positive { color: var(--positive); }
.score-badge.negative { color: var(--negative); }
.score-badge.neutral  { color: var(--text-muted); }

.gazette-list {
  list-style: none;
  font-size: 12px;
  color: var(--text-muted);
  max-height: 200px;
  overflow-y: auto;
}

.gazette-list li {
  padding: 3px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.direction-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  text-transform: uppercase;
}

.direction-badge.mtf,
.direction-badge.female { background: rgba(228,87,86,0.2); color: var(--mtf); }
.direction-badge.ftm,
.direction-badge.male { background: rgba(76,120,168,0.2); color: var(--ftm); }
.direction-badge.unclear,
.direction-badge.neutral { background: var(--surface-2); color: var(--text-dim); }

.explorer-empty {
  color: var(--text-muted);
  font-size: 13px;
  padding: 32px;
  text-align: center;
}

/* ===== Browse tab ===== */
.browse-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  align-items: center;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.filter-group label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

select, input[type="range"] {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
}

select:focus { border-color: var(--accent); }

.name-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.name-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.name-card:hover {
  border-color: var(--accent);
  background: var(--surface-2);
}

.name-card .name-text {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.name-card .name-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.name-card .record-count {
  font-size: 11px;
  color: var(--text-dim);
}

.curve-score-mini {
  font-size: 12px;
  font-weight: 600;
}

.curve-score-mini.positive { color: var(--positive); }
.curve-score-mini.negative { color: var(--negative); }
.curve-score-mini.neutral  { color: var(--text-muted); }

.load-more {
  display: block;
  margin: 0 auto 8px;
  padding: 8px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  transition: border-color 0.15s;
}

.load-more:hover { border-color: var(--accent); color: var(--text); }

/* ===== Viz tab ===== */
.viz-subnav {
  display: flex;
  gap: 2px;
  padding: 16px 32px 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.viz-subnav button {
  padding: 8px 14px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.15s;
  margin-bottom: -1px;
}

.viz-subnav button:hover { color: var(--text); }
.viz-subnav button.active { color: var(--text); border-bottom-color: var(--accent); }

.viz-panel { display: none; padding: 24px 32px; }
.viz-panel.active { display: block; }

/* ===== Data table tab ===== */
.table-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.table-controls input {
  padding: 7px 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 13px;
  width: 220px;
  outline: none;
}

.table-controls input:focus { border-color: var(--accent); }

.btn {
  padding: 7px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  transition: border-color 0.15s, color 0.15s;
}

.btn:hover { border-color: var(--accent); color: var(--text); }

.table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead th {
  padding: 10px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

thead th:hover { color: var(--text); }

thead th .sort-arrow {
  display: inline-block;
  margin-left: 4px;
  opacity: 0.4;
}

thead th.sort-asc .sort-arrow::after { content: '▲'; opacity: 1; }
thead th.sort-desc .sort-arrow::after { content: '▼'; opacity: 1; }
thead th .sort-arrow::after { content: '⇅'; }

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

tbody tr:hover { background: var(--surface-2); }
tbody td { padding: 8px 14px; }

.delta-badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 600;
}

.delta-badge.mtf { background: rgba(228,87,86,0.15); color: var(--mtf); }
.delta-badge.ftm { background: rgba(76,120,168,0.15); color: var(--ftm); }
.delta-badge.neutral { background: var(--surface-2); color: var(--text-dim); }

.cs-cell.positive { color: var(--positive); font-weight: 600; }
.cs-cell.negative { color: var(--negative); font-weight: 600; }
.cs-cell.null     { color: var(--text-dim); }

.pagination {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.pagination button {
  padding: 4px 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
}

.pagination button:disabled { opacity: 0.4; cursor: default; }
.pagination button:not(:disabled):hover { border-color: var(--accent); color: var(--text); }
.pagination .page-info { flex: 1; text-align: center; }

/* ===== About tab ===== */
.about-prose {
  max-width: 720px;
  line-height: 1.75;
}

.about-prose h1 { font-size: 22px; margin-bottom: 6px; }
.about-prose h2 { font-size: 16px; margin: 28px 0 8px; color: var(--text); border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.about-prose h3 { font-size: 14px; margin: 20px 0 6px; color: var(--text); }
.about-prose p  { margin-bottom: 12px; color: var(--text); }
.about-prose ul, .about-prose ol { padding-left: 20px; margin-bottom: 12px; }
.about-prose li { margin-bottom: 4px; }
.about-prose code { background: var(--surface-2); padding: 1px 5px; border-radius: 3px; font-family: monospace; font-size: 12px; }
.about-prose pre { background: var(--surface-2); padding: 12px; border-radius: var(--radius); overflow-x: auto; margin-bottom: 12px; }
.about-prose pre code { background: none; padding: 0; }
.about-prose table { border-collapse: collapse; margin-bottom: 12px; font-size: 13px; }
.about-prose table th, .about-prose table td { border: 1px solid var(--border); padding: 6px 10px; }
.about-prose table th { background: var(--surface-2); }
.about-prose strong { color: var(--text); }
.about-prose em { color: var(--text-muted); }
.about-prose blockquote { border-left: 3px solid var(--accent); padding-left: 12px; color: var(--text-muted); margin-bottom: 12px; }

/* ===== Utilities ===== */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }
.section-gap { margin-bottom: 24px; }

/* ===== Lag explorer controls ===== */
.lag-controls {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.lag-controls label {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.lag-controls input[type="range"] {
  width: 120px;
  padding: 2px;
}

.lag-controls input[type="text"] {
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 13px;
  width: 180px;
  outline: none;
}

.lag-controls input[type="text"]:focus { border-color: var(--accent); }

/* ===== Dual range slider ===== */
.dual-range-container {
  margin-bottom: 6px;
}
.dual-range-labels {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.dual-range-labels strong { color: var(--text); }
.dual-range-wrap {
  position: relative;
  height: 20px;
}
.dual-range-track {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  pointer-events: none;
}
.dual-range-fill {
  position: absolute;
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
}
/* Use .dual-range-wrap specificity boost to beat global input[type="range"] rule */
.dual-range-wrap input[type="range"].dual-range-input {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  height: 4px;
  background: transparent;
  border: none;
  padding: 0;
  -webkit-appearance: none;
  appearance: none;
  pointer-events: none;
  outline: none;
  cursor: default;
  z-index: 1;
}
.dual-range-wrap input[type="range"].dual-range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  pointer-events: all;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: grab;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
}
.dual-range-wrap input[type="range"].dual-range-input:active::-webkit-slider-thumb { cursor: grabbing; }
.dual-range-wrap input[type="range"].dual-range-input::-moz-range-thumb {
  pointer-events: all;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: grab;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
}
.dual-range-wrap input[type="range"].dual-range-input::-webkit-slider-runnable-track { background: transparent; }
.dual-range-wrap input[type="range"].dual-range-input::-moz-range-track { background: transparent; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #sidebar {
    width: 100%;
    min-height: auto;
    position: relative;
    flex-direction: row;
    align-items: center;
    padding: 0;
  }
  .sidebar-footer { display: none; }
  #sidebar nav ul {
    display: flex;
    padding: 0;
    overflow-x: auto;
  }
  #sidebar nav ul li a {
    border-left: none;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    padding: 12px 14px;
  }
  #sidebar nav ul li a.active { border-bottom-color: var(--accent); }
  body { flex-direction: column; }
  #content { margin-left: 0; }
  .explorer-layout { grid-template-columns: 1fr; }
  .callouts { grid-template-columns: 1fr; }
  .page-body { padding: 16px; }
  .viz-subnav { padding: 12px 16px 0; }
  .viz-panel { padding: 16px; }
}