:root,
[data-theme="light"] {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --line: #cbd5e1;
  --txt: #0f172a;
  --mut: #475569;
  --amb: #d97706;
  --ok: #059669;
  --warn: #dc2626;
  --chart-bg: #ffffff;
  --chart-border: #334155;
  --chart-grid: #94a3b8;
  --chart-line: #1e3a8a;
  --chart-highlight: #2563eb;
  --chart-label: #334155;
  --chart-guide: #ffb020;
  --chart-guide-active: var(--chart-guide);
  --chart-user-path: var(--chart-guide);
  --chart-marker: var(--chart-guide);
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0b1426;
  --panel: #111d36;
  --line: #22345a;
  --txt: #e6ecf7;
  --mut: #8ea0c2;
  --amb: #ffb020;
  --ok: #3ddc97;
  --warn: #ff6b5a;
  --chart-bg: #0a1222;
  --chart-border: #22345a;
  --chart-grid: #64748b;
  --chart-line: #5f86c9;
  --chart-highlight: #9fbbe8;
  --chart-label: #8ea0c2;
  --chart-guide: #ffb020;
  --chart-guide-active: var(--chart-guide);
  --chart-user-path: var(--chart-guide);
  --chart-marker: var(--chart-guide);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font: 14px/1.45 "Inter", "Segoe UI", system-ui, sans-serif;
}

.mono {
  font-family: "JetBrains Mono", "DejaVu Sans Mono", monospace;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.disc {
  background: #3a2a05;
  border-bottom: 1px solid var(--amb);
  color: #ffd27a;
  padding: 7px 18px;
  font-size: 12.5px;
}

[data-theme="light"] .disc {
  background: #fff7ed;
  color: #92400e;
}

.disc b {
  color: var(--amb);
}

.header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.5px;
  font-size: 17px;
}

.logo span {
  color: var(--amb);
}

.subtitle {
  color: var(--mut);
  font-size: 13px;
  margin: 0;
}

.nav {
  margin-left: auto;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}

.nav-btn {
  white-space: nowrap;
  color: var(--mut);
  background: transparent;
  border: 0;
  padding: 7px 12px;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
}

.nav-btn.on,
.nav-btn.active {
  background: var(--panel);
  color: var(--amb);
  box-shadow: inset 0 -2px var(--amb);
}

.lang-btn {
  border: 1px solid var(--line);
  color: var(--amb);
  background: var(--chart-bg);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  font: inherit;
}

.palette-picker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: default;
}

.palette-picker-label {
  font-weight: 600;
}

.palette-select {
  background: var(--chart-bg);
  color: var(--txt);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  font: inherit;
  max-width: 12rem;
}

.plot-svg line,
.plot-svg polyline,
.plot-svg circle,
.plot-svg rect.chart-panel,
.strip-svg line,
.strip-svg polyline,
.strip-svg circle,
.strip-svg rect.chart-panel {
  vector-effect: non-scaling-stroke;
}

.plot-svg .chart-stroke-grid,
.strip-svg .chart-stroke-grid {
  stroke: var(--chart-grid);
  stroke-width: 1px;
  fill: none;
}

.plot-svg .chart-stroke-line,
.strip-svg .chart-stroke-line {
  stroke: var(--chart-line);
  stroke-width: 2px;
  fill: none;
}

.plot-svg .chart-stroke-line-hi,
.strip-svg .chart-stroke-line-hi {
  stroke: var(--chart-highlight);
  stroke-width: 2px;
  fill: none;
}

.plot-svg .chart-stroke-guide,
.strip-svg .chart-stroke-guide {
  stroke: var(--chart-guide);
  stroke-width: 2px;
  fill: none;
}

.plot-svg .chart-stroke-guide-active,
.strip-svg .chart-stroke-guide-active {
  stroke: var(--chart-guide-active);
  stroke-width: 2.5px;
  fill: none;
}

.plot-svg .chart-stroke-user-path,
.strip-svg .chart-stroke-user-path {
  stroke: var(--chart-user-path);
  stroke-width: 3.5px;
  fill: none;
  stroke-linejoin: round;
}

.plot-svg .chart-marker,
.strip-svg .chart-marker {
  fill: var(--chart-marker);
  stroke: var(--chart-bg);
  stroke-width: 1.5px;
}

.plot-svg rect.chart-panel,
.strip-svg rect.chart-panel {
  fill: var(--chart-bg);
  stroke: var(--chart-border);
  stroke-width: 1px;
}

@media (max-width: 640px) {
  .plot-svg .chart-stroke-grid,
  .strip-svg .chart-stroke-grid {
    stroke-width: 1.25px;
  }
  .plot-svg .chart-stroke-line,
  .strip-svg .chart-stroke-line,
  .plot-svg .chart-stroke-line-hi,
  .strip-svg .chart-stroke-line-hi {
    stroke-width: 2.25px;
  }
  .plot-svg .chart-stroke-guide,
  .strip-svg .chart-stroke-guide {
    stroke-width: 2.25px;
  }
  .plot-svg .chart-stroke-guide-active,
  .strip-svg .chart-stroke-guide-active {
    stroke-width: 2.75px;
  }
  .plot-svg .chart-stroke-user-path,
  .strip-svg .chart-stroke-user-path {
    stroke-width: 4px;
  }
  .plot-svg .chart-marker,
  .strip-svg .chart-marker {
    stroke-width: 2px;
  }
}

[data-theme="dark"][data-palette="vfr_chart"] .chart-stroke-user-path {
  stroke-width: 5px;
}

[data-theme="dark"][data-palette="vfr_chart"] .chart-marker {
  stroke-width: 2px;
}

[data-theme="dark"][data-palette="vfr_chart"] .chart-stroke-guide,
[data-theme="dark"][data-palette="vfr_chart"] .chart-stroke-guide-active {
  stroke-width: 2px;
}

.main {
  padding: 18px;
  max-width: 1400px;
  margin: auto;
}

.grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 18px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

.card h2,
.card h3 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--mut);
}

.f {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 7px 0;
}

.f label {
  color: var(--mut);
  font-size: 13px;
}

.f input {
  width: 120px;
  background: var(--chart-bg);
  border: 1px solid var(--line);
  color: var(--txt);
  padding: 6px 8px;
  border-radius: 5px;
  text-align: right;
  font: inherit;
}

.btn {
  background: var(--amb);
  color: #1a1200;
  border: 0;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}

.btn.g {
  background: transparent;
  color: var(--txt);
  border: 1px solid var(--line);
}

.btn.g.on {
  color: var(--amb);
  border-color: var(--amb);
}

.toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.big {
  font-size: 22px;
  font-weight: 600;
  color: var(--amb);
}

.u {
  font-size: 13px;
  color: var(--mut);
  margin-left: 4px;
}

.lab {
  color: var(--mut);
  font-size: 12px;
}

.chip {
  display: inline-block;
  margin: 8px 0;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 20px;
  background: var(--chart-bg);
  border: 1px solid var(--line);
  color: var(--mut);
}

.provenance {
  color: var(--mut);
  font-size: 0.85rem;
}

.warnings {
  color: var(--warn);
  font-size: 0.85rem;
  padding-left: 1.2rem;
}

.strip-svg {
  min-height: 360px;
  width: 100%;
  touch-action: none;
}

.plot-svg {
  width: 100%;
  min-height: 280px;
  border: 1px solid var(--line);
  border-radius: 8px;
  touch-action: none;
  user-select: none;
}

.hint {
  color: var(--mut);
  font-size: 12px;
}

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

.data-table th,
.data-table td {
  padding: 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.data-table th {
  color: var(--mut);
  text-transform: uppercase;
  font-size: 11px;
}

.data-table tr.row-hi td {
  background: color-mix(in srgb, var(--amb) 18%, transparent);
  color: var(--txt);
  font-weight: 600;
}

.table-scroll {
  overflow-x: auto;
  margin-bottom: 12px;
}

.save-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.footer {
  margin-top: 2rem;
  color: var(--mut);
  font-size: 0.85rem;
  padding: 0 18px 18px;
}

.footer a {
  color: var(--amb);
}

.error {
  color: var(--warn);
}

.reading-list {
  list-style: none;
  padding: 0;
}

.reading-list li {
  background: var(--chart-bg);
  border: 1px solid var(--line);
  margin-bottom: 0.5rem;
  padding: 0.75rem;
  border-radius: 8px;
}

.method-list {
  padding-left: 1.2rem;
}

.man h4 {
  color: var(--amb);
  margin: 12px 0 4px;
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .nav {
    margin-left: 0;
    width: 100%;
  }
}

.qnh-row {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.qnh-row input {
  flex: 1;
}

.pa-deriv {
  font-size: 0.85rem;
  color: var(--mut);
}

.chip.pa-override {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--line);
  padding: 0.35rem 0.5rem;
  text-align: left;
}

.compare-picks {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}