:root {
  /* modernfontstacks.com: Industrial */
  --theme-font-family: Bahnschrift, 'DIN Alternate', 'Franklin Gothic Medium', 'Nimbus Sans Narrow', sans-serif-condensed, sans-serif;

  --theme-border-color: #79747e;
  --theme-gridline-color: #cac4d0;
  --theme-background-color-base: #fffbfe;
  --theme-background-color-layerup: #e7e0ec;
  --theme-text-color-base: #1c1b1f;
  --theme-text-color-layerup: #49454f;
  /* base hues for price buckets (used as source for both light and dark) */
  --price-color-low-base: #2f4b7c;
  --price-color-medium-base: #ff7c43;
  --price-color-high-base: #d45087;
  /* effective colors in current theme */
  --price-color-low: var(--price-color-low-base);
  --price-color-medium: var(--price-color-medium-base);
  --price-color-high: var(--price-color-high-base);
  --price-color-default: var(--price-color-low);

  --chart-background-color: var(--theme-background-color-base);
  --chart-text-color: var(--theme-text-color-base);
  --chart-grid-line-color: var(--theme-gridline-color);
  --chart-tooltip-background-color: var(--theme-background-color-base);
  --chart-tooltip-border-color: var(--theme-border-color);

  --chart-button-background-color: transparent;
  --chart-button-text-color: var(--theme-text-color-layerup);
  --chart-button-border-color: var(--theme-border-color);
  --chart-button-background-color-active: var(--theme-background-color-base);

  --menu-border-color: var(--theme-border-color);
  --menu-base-background-color: var(--theme-background-color-base);
  --menu-background-color: var(--theme-background-color-layerup);
  --menu-text-color: var(--theme-text-color-base);
  --menu-highlight-background-color: var(--theme-background-color-base);
  --menu-highlight-text-color: var(--theme-text-color-base);
}
:root.dark {
  --theme-border-color: #938f99;
  --theme-gridline-color: #49454f;
  --theme-background-color-base: #1c1b1f;
  --theme-background-color-layerup: #313033;
  --theme-text-color-base: #e7e0ec;
  --theme-text-color-layerup: #b6bab1;
  /* darken hues based on base color with 15% black mixed in (avoid self-reference) */
  --price-color-low: color-mix(in srgb, var(--price-color-low-base), #000 15%);
  --price-color-medium: color-mix(in srgb, var(--price-color-medium-base), #000 15%);
  --price-color-high: color-mix(in srgb, var(--price-color-high-base), #000 15%);

  --chart-background-color: var(--theme-background-color-base);
  --chart-text-color: var(--theme-text-color-base);
  --chart-grid-line-color: var(--theme-gridline-color);
  --chart-tooltip-background-color: var(--theme-background-color-base);
  --chart-tooltip-border-color: var(--theme-border-color);

  --chart-button-background-color: transparent;
  --chart-button-text-color: var(--theme-text-color-layerup);
  --chart-button-border-color: var(--theme-border-color);
  --chart-button-background-color-active: var(--theme-background-color-base);

  --menu-border-color: var(--theme-border-color);
  --menu-base-background-color: var(--theme-background-color-base);
  --menu-background-color: var(--theme-background-color-layerup);
  --menu-text-color: var(--theme-text-color-base);
  --menu-highlight-background-color: var(--theme-background-color-base);
  --menu-highlight-text-color: var(--theme-text-color-base);
}
html {
  height: 100%;
  overflow: hidden;
}
@media (max-width: 440px) and (orientation: portrait) {
  html {
    font-size: 12px;
  }
}
body {
  height: 100%;
  font-family: var(--theme-font-family);
  background-color: var(--theme-background-color-base);
  color: var(--theme-text-color-base);
  margin: 0;
  padding: 0.5rem;
  box-sizing: border-box;
  overflow: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}
@media (prefers-reduced-motion: reduce) {
  body {
    transition: none !important;
  }
  price-card {
    transition: none !important;
  }
  .chart-controls button {
    transition: none !important;
  }
}
.container {
  max-width: calc(100vw - 2rem);
  margin: 0 auto;
  height: 100%;
  display: grid;
  gap: 0.5rem;
  grid-template-columns: auto repeat(3, 1fr); /* Menu (auto) + three cards */
  grid-template-rows: auto 1fr; /* Cards row + chart fills remaining */
}
price-card {
  /* Allow JS to set a themed background via CSS custom prop */
  background-color: var(--price-card-background, var(--theme-background-color-layerup));
  color: var(--theme-text-color-base);
  border-radius: 0.75rem;
  padding: 0.5rem 1.5rem;
  transition: background-color 0.5s ease;
}
.chart-container {
  grid-column: 1 / -1;
  grid-row: 2;
  background-color: var(--theme-background-color-layerup);
  border-radius: 0.75rem;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  max-width: calc(100vw - 2rem);
}
.chart-controls-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  gap: 1rem;
}
.chart-controls {
  display: flex;
}
.chart-controls button {
  font-family: var(--theme-font-family);
  font-size: 0.875rem;
  font-weight: 400;
  border: 1px solid var(--chart-button-border-color);
  background-color: var(--chart-button-background-color);
  color: var(--chart-button-text-color);
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
  margin-left: -1px;
}
.chart-controls button:first-child {
  margin-left: 0;
  border-top-left-radius: 1.5rem;
  border-bottom-left-radius: 1.5rem;
}
.chart-controls button:last-child {
  border-top-right-radius: 1.5rem;
  border-bottom-right-radius: 1.5rem;
}
.chart-controls button.active {
  background-color: var(--chart-button-background-color-active);
  font-weight: 700;
}
price-chart {
  display: block;
  max-width: 100vw;
  flex-grow: 1;
  max-height: 100%; /* Fill the flexible parent container */
}

/* accessible screen-reader-only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* menu styles */
.menu-root {
  /* inline grid item like a card */
  background-color: var(--theme-background-color-layerup);
  color: var(--theme-text-color-base);
  border-radius: 0.75rem;
  padding: 0.5rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative; /* anchor dropdown */
}

#menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  background-color: var(--menu-base-background-color);
  color: var(--menu-text-color);
  border: 1px solid var(--chart-button-border-color);
  border-radius: 0.5rem;
  cursor: pointer;
}

#menu-toggle .hamburger,
#menu-toggle .hamburger::before,
#menu-toggle .hamburger::after {
  content: '';
  display: block;
  width: 1.8rem;
  height: 0.18rem;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease;
}

#menu-toggle .hamburger {
  position: relative;
}

#menu-toggle .hamburger::before {
  position: absolute;
  top: -0.5rem;
}

#menu-toggle .hamburger::after {
  position: absolute;
  top: 0.5rem;
}

.menu {
  position: absolute;
  top: calc(4rem + 1rem); /* button height + top padding + gap */
  left: 0;
  min-width: 14rem;
  padding: 0.25rem;
  background-color: var(--menu-background-color);
  color: var(--menu-text-color);
  border: 1px solid var(--menu-border-color);
  border-radius: 0.5rem;
  display: none;
  z-index: 100;
}

.menu-root.open .menu {
  display: block;
}

.menu button[role='menuitem'] {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: inherit;
  padding: 0.9rem 1rem;
  border-radius: 0.4rem;
  font-family: var(--theme-font-family);
  font-size: 1rem;
  cursor: pointer;
}

.menu button[role='menuitem']:hover,
.menu button[role='menuitem']:focus {
  background-color: var(--menu-highlight-background-color);
  color: var(--menu-highlight-text-color);
  outline: none;
}