:root {
  --bg: #ffffff;
  --bg-soft: #e8ecf2;
  --fg: #2a2f3a;
  --fg-soft: #5a6270;
  --gray: #8a93a6;
  --gray-light: #c7cdd7;
  --primary: var(--fg);
  --east-asia: #f78fb3;
  --europe: #2e86ab;
  --latin-america:  #8b7cf0;
  --mena: #7fdbca;
  --north-america: #f07178;
  --south-asia: #ffb454;
  --sub-saharan: #5874dc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "FiraSans", sans-serif;
}

.wrap {
  max-width: 1200px;
  margin: 24px auto 32px;
  padding: 0 20px 24px;
}

h1 {
  font-family: "Space Grotesk", sans-serif;
  font-size: 32px;
  margin: 0 0 6px;
}

.subtitle {
  font-family: "Fira Sans", sans-serif;
  font-size: 16px;
  margin: 0 0 16px;
  color: var(--fg-soft);
}

.subtitle-hint {
  font-size: 12px;
  margin: -8px 0 16px;
  color: var(--fg-soft);
}

.keycap {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--fg-soft);
  border-radius: 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--fg-soft);
}

.controls button,
.slider-wrap button {
  font-family: "Fira Sans", sans-serif;
  background: var(--bg);
  border: 1px solid var(--fg);
  color: var(--fg);
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.1s ease;
}

.controls button:hover,
.slider-wrap button:hover {
  background: var(--fg);
  color: var(--bg);
}

.controls button:active,
.slider-wrap button:active {
  transform: translateY(1px);
}

.controls button:focus-visible,
.slider-wrap button:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.slider-wrap {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.slider-block {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-wrap input[type="range"] {
  appearance: none;
  width: 100%;
  background: transparent;
}



.slider-wrap input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--gray-light);
  border-radius: 999px;
}

.slider-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 14px;
  width: 14px;
  border-radius: 50%;
  background: var(--fg);
  border: 2px solid var(--bg);
  margin-top: -5px;
}

.slider-wrap input[type="range"]::-moz-range-track {
  height: 4px;
  background: var(--fg);
  border-radius: 999px;
}

.slider-wrap input[type="range"]::-moz-range-thumb {
  height: 14px;
  width: 14px;
  border-radius: 50%;
  background: var(--fg);
  border: 2px solid var(--bg);
}

.year-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--fg-soft);
  padding: 0 2px;
}

.year-ticks span {
  min-width: 24px;
  text-align: center;
}

.caption {
  font-family: "Fira Sans", sans-serif;
  font-size: 12px;
  color: var(--fg-soft);
  margin-top: 12px;
}

.tooltip {
  position: absolute;
  background: var(--bg);
  border: 1px solid var(--bg-soft);
  color: var(--fg);
  font-family: "Fira Sans", sans-serif;
  font-size: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  pointer-events: none;
  box-shadow: 0 16px 32px rgba(42, 47, 58, 0.18), 0 6px 14px rgba(42, 47, 58, 0.12);
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 10;
}

.tooltip-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
}

.tooltip-meta {
  color: var(--fg-soft);
  margin-bottom: 6px;
}

.tooltip-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.tooltip-row + .tooltip-row {
  margin-top: 2px;
}

.tooltip-value {
  font-weight: 600;
}

.tooltip-section {
  margin-top: 8px;
}

.tooltip .slope-graph {
  display: block;
  margin-top: 6px;
}

.tooltip .slope-label {
  display: block;
  margin-top: 4px;
  font-size: 10px;
  color: var(--fg-soft);
}

.legend-item {
  cursor: pointer;
}

.legend-item.is-muted {
  opacity: 0.45;
}

svg text {
  font-family: "Fira Sans", sans-serif;
  font-weight: 900;
}

svg {
  width: 100%;
  height: auto;
  display: block;
}