:root {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-border: #e0e0e0;
  --color-text: #212121;
  --color-text-secondary: #757575;
  --color-polar: #1976d2;
  --color-mc: #e53935;
  --color-mc-point: #e53935;
  --color-hover: #2e7d32;
  --color-grid: #e0e0e0;
  --color-axis: #424242;
  --color-header-bg: #1565c0;
  --color-header-text: #ffffff;
  --color-compare: #00897b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121212;
    --color-surface: #1e1e1e;
    --color-border: #333333;
    --color-text: #e0e0e0;
    --color-text-secondary: #9e9e9e;
    --color-polar: #64b5f6;
    --color-mc: #ef9a9a;
    --color-mc-point: #ef9a9a;
    --color-hover: #81c784;
    --color-grid: #333333;
    --color-axis: #bdbdbd;
    --color-header-bg: #0d47a1;
    --color-header-text: #ffffff;
    --color-compare: #4db6ac;
  }
}

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

[hidden] { display: none !important; }

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  background: var(--color-bg);
  color: var(--color-text);
}

#app {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  height: 100vh;
  min-height: 0;
}

#attribution {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 5px 12px;
  font-size: 11px;
  color: var(--color-text-secondary);
  text-align: center;
}

#attribution a {
  color: var(--color-polar);
  text-decoration: none;
}

#attribution a:hover {
  text-decoration: underline;
}

header {
  background: var(--color-header-bg);
  color: var(--color-header-text);
  padding: 10px 16px;
  display: flex;
  align-items: center;
}

header h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

#controls {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 8px 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.aircraft-group {
  flex: 1 1 200px;
  min-width: 160px;
  max-width: 360px;
}

.aircraft-group label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 5px;
}

.color-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.aircraft-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.aircraft-row select {
  flex: 1;
  min-width: 0;
}

#aircraft-select {
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 13px;
  cursor: pointer;
  outline: none;
}

#aircraft-select:focus {
  border-color: var(--color-polar);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-polar) 20%, transparent);
}

fieldset {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 8px 6px;
}

legend {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: 0 2px;
}

fieldset label {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-right: 8px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}

fieldset input[type="radio"] {
  cursor: pointer;
  accent-color: var(--color-polar);
}

.slider-group {
  flex: 1 1 180px;
  min-width: 140px;
}

.slider-group label {
  font-size: 12px;
  color: var(--color-text);
  white-space: nowrap;
  display: block;
}

.slider-hint {
  font-size: 11px;
  color: var(--color-text-secondary);
  margin-left: 4px;
}

#airmass-slider,
#mc-slider {
  width: 100%;
  cursor: pointer;
  accent-color: var(--color-polar);
  height: 4px;
  margin-top: 4px;
}

#chart-container {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  background: var(--color-surface);
}

#polar-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

#tooltip {
  position: absolute;
  pointer-events: none;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 12px;
  line-height: 1.6;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  white-space: nowrap;
  z-index: 10;
}

#tooltip[hidden] {
  display: none;
}

#tip-speed {
  font-weight: 600;
  color: var(--color-text);
}

#tip-sink {
  color: var(--color-text-secondary);
}

#tooltip.comparing #tip-sink {
  color: var(--color-polar);
}

#tip-compare-sink {
  color: var(--color-compare);
}

#tip-ld {
  color: var(--color-text-secondary);
}

#tooltip.comparing #tip-ld {
  color: var(--color-polar);
}

#tip-compare-ld {
  color: var(--color-compare);
}

.compare-btn {
  padding: 5px 12px;
  border: 1px solid var(--color-compare);
  border-radius: 14px;
  background: transparent;
  color: var(--color-compare);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.compare-btn:hover {
  background: color-mix(in srgb, var(--color-compare) 12%, transparent);
}

.compare-btn[aria-pressed="true"] {
  background: var(--color-compare);
  color: #fff;
}

#compare-aircraft-select {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 13px;
  cursor: pointer;
  outline: none;
}

#compare-aircraft-select:focus {
  border-color: var(--color-compare);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-compare) 20%, transparent);
}

@media (max-width: 480px) {
  header h1 {
    font-size: 15px;
  }

  #controls {
    padding: 6px 8px;
    gap: 8px;
  }

  .aircraft-group {
    flex: 1 1 100%;
    max-width: none;
  }

  #compare-aircraft-group {
    flex: 1 1 100%;
    max-width: none;
  }

  fieldset {
    padding: 3px 6px 5px;
  }

  fieldset label {
    margin-right: 6px;
    font-size: 12px;
  }

  .slider-group {
    flex: 1 1 100%;
  }
}