:root {
  color-scheme: dark;
  --bg: #0f1420;
  --panel: #171e2e;
  --text: #dbe2f0;
  --accent: #4f8cff;
  --border: #263149;
}
* { box-sizing: border-box; }
/* explicit display rules above must not defeat the hidden attribute */
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, sans-serif;
}
header {
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
h1 { margin: 0 0 8px; font-size: 20px; }
.controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
select, button {
  background: #202a41;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 14px;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: default; }
input[type="date"], input[type="number"] {
  background: #202a41;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 14px;
  color-scheme: dark;
}
.date-range {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.date-range label { opacity: 0.7; font-size: 13px; }
.presets {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
}
.preset-btn {
  padding: 3px 8px;
  font-size: 12px;
  background: transparent;
  color: #9fb2d8;
  border: 1px solid var(--border);
  border-radius: 5px;
}
.preset-btn:hover { color: var(--text); border-color: var(--accent); }
input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; vertical-align: middle; cursor: pointer; }
.link-btn {
  background: transparent;
  border: none;
  color: var(--accent);
  padding: 2px 6px;
  font-size: 13px;
  text-decoration: underline;
}
.export-label { margin-left: 16px; opacity: 0.7; }
#status-wrap { margin-top: 10px; }
#status-wrap.hidden { display: none; }
#status-text { font-size: 13px; margin-bottom: 4px; opacity: 0.85; }
.bar {
  height: 8px;
  border-radius: 4px;
  background: #223;
  overflow: hidden;
}
#status-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.4s ease;
}
#status-bar.error { background: #e05555; }
main {
  display: grid;
  gap: 14px;
  padding: 14px 20px;
}
main.layout-2 { grid-template-columns: 1fr 1fr; }
main.layout-1 { grid-template-columns: 1fr; }
main.layout-3 { grid-template-columns: 1fr 1fr 1fr; }
.chart-container {
  position: relative;
}
.chart-container.wide { grid-column: 1 / -1; }
.chart {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 340px;
}
.src-link {
  position: absolute;
  top: 6px;
  right: 10px;
  z-index: 5;
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  opacity: 0.5;
  padding: 2px 6px;
  background: rgba(15,20,32,0.6);
  border-radius: 4px;
  line-height: 1;
}
.src-link:hover { opacity: 1; text-decoration: underline; }
.export-chk {
  position: absolute;
  top: 6px;
  left: 10px;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  opacity: 0.75;
  line-height: 1;
  padding: 2px 6px;
  background: rgba(15,20,32,0.6);
  border-radius: 4px;
  cursor: pointer;
}
.export-chk:hover { opacity: 1; }
.chart-container:has(.chart-grip) .export-chk { left: 44px; }
.export-chk input:disabled { cursor: default; opacity: 0.5; }
.chart-grip {
  position: absolute;
  top: 6px;
  z-index: 5;
  cursor: grab;
  font-size: 12px;
  line-height: 1;
  padding: 2px 6px;
  background: #202a41;
  border: 1px solid var(--border);
  border-radius: 4px;
  opacity: 0.9;
  user-select: none;
}
.chart-grip { left: 10px; }
.chart-grip:hover { opacity: 1; border-color: var(--accent); }
.chart-grip:active { cursor: grabbing; }
footer {
  padding: 8px 20px 20px;
  font-size: 12px;
  opacity: 0.6;
}
.view-tabs {
  display: inline-flex;
  gap: 4px;
}
.tab-btn {
  padding: 6px 14px;
  font-size: 14px;
  background: transparent;
  color: #9fb2d8;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.tab-btn:hover { color: var(--text); border-color: var(--accent); }
.tab-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.overlay-pick {
  position: absolute;
  top: 6px;
  right: 44px;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  opacity: 0.85;
  line-height: 1;
  padding: 2px 6px;
  background: rgba(15,20,32,0.6);
  border-radius: 4px;
  max-width: 70%;
  flex-wrap: wrap;
}
.overlay-pick:hover { opacity: 1; }
.overlay-pick select {
  padding: 2px 6px;
  font-size: 12px;
  max-width: 110px;
}
.overlay-pick select:disabled { opacity: 0.45; cursor: default; }
#overlay-chips {
  display: inline-flex;
  gap: 4px;
  flex-wrap: wrap;
}
.overlay-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px 4px 1px 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 11px;
  background: #202a41;
  line-height: 1.4;
}
.chip-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}
.chip-x {
  background: transparent;
  border: none;
  color: #9fb2d8;
  padding: 0 2px;
  font-size: 12px;
  cursor: pointer;
  line-height: 1;
}
.chip-x:hover { color: #e05555; }
#overlay-reset {
  font-size: 11px;
  padding: 0 2px;
}
#overlay-reset[hidden] { display: none; }
#analytics-view {
  display: grid;
  gap: 14px;
  padding: 14px 20px;
}
#analytics-view.hidden { display: none; }
.analytics-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  opacity: 0.9;
}
.analytics-controls label { display: inline-flex; align-items: center; gap: 6px; }
#an-info { opacity: 0.7; }
#an-heatmap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 640px;
}
#an-pairs { font-size: 12px; opacity: 0.75; min-height: 1em; }
.an-hl-btn.active { cursor: pointer; }
#an-hl-high.active { border-color: #3fb950; background: rgba(63, 185, 80, 0.15); }
#an-hl-low.active { border-color: #f85149; background: rgba(248, 81, 73, 0.15); }
.an-table-wrap {
  overflow-x: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}
#an-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
#an-table th, #an-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  white-space: nowrap;
}
#an-table th:first-child, #an-table td:first-child { text-align: left; }
#an-table tbody tr:hover { background: #202a41; }
.an-hint { margin: 0; font-size: 12px; opacity: 0.6; }
#spread-view {
  display: grid;
  gap: 14px;
  padding: 14px 20px;
}
#spread-view.hidden { display: none; }
.spread-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  opacity: 0.9;
}
.spread-controls label { display: inline-flex; align-items: center; gap: 6px; }
#spread-info { opacity: 0.7; }
@media (max-width: 1100px) {
  main.layout-2, main.layout-1, main.layout-3 { grid-template-columns: 1fr; }
}