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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
}

a {
  color: currentColor;
}

svg {
  display: block;
  max-width: 100%;
  height: auto;
  overflow: visible;
}

:root {
  --font-family: "Sofia Sans Condensed", sans-serif;

  --font-size-xs: clamp(0.79rem, -0.13vi + 0.82rem, 0.72rem);
  --font-size-sm: clamp(0.89rem, 0.02vi + 0.88rem, 0.9rem);
  --font-size-md: clamp(1rem, 0.23vi + 0.94rem, 1.13rem);
  --font-size-lg: clamp(1.13rem, 0.51vi + 1rem, 1.41rem);
  --font-size-xl: clamp(1.27rem, 0.89vi + 1.04rem, 1.76rem);
  --font-size-2xl: clamp(1.42rem, 1.41vi + 1.07rem, 2.2rem);
  --font-size-3xl: clamp(1.6rem, 2.08vi + 1.08rem, 2.75rem);
  --font-size-4xl: clamp(1.8rem, 2.97vi + 1.06rem, 3.43rem);

  --font-size-vis-sm: 14px;
  --font-size-vis-md: 16px;
  --font-size-vis-lg: 18px;

  --font-weight-normal: 400;
  --font-weight-bold: 700;

  --line-height-title: 1.1;
  --line-height-body: 1.4;

  --color-background: #000;
  --color-text: #fff;
  --color-accent: #e1fd1d;
  --color-text-invert: #000;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-body);
  font-size: var(--font-size-md);
  color: var(--color-text);
  background-color: var(--color-background);
}

h1 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-title);
  font-size: var(--font-size-3xl);
  background-color: var(--color-accent);
  color: var(--color-text-invert);
  padding: 0.1em 0.2em;
  display: inline-block;
}

hgroup p {
  text-align: end;
  font-size: var(--font-size-xl);
}

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

article {
  margin-block: 4rem;
  display: grid;
  place-items: center;
  gap: 2rem;
}

footer {
  max-width: 80ch;
}

footer p + p {
  margin-block-start: 1em;
}

.loader {
  height: 400px;
  display: grid;
  place-items: center;
}

.chart {
  font-size: var(--font-size-vis-md);
}

.chart,
.chart > svg {
  width: 100%;
}

.chart text {
  fill: var(--color-text-invert);
}

.ridge__area {
  fill: var(--color-background);
  fill-opacity: 1;
}

.ridge__line {
  fill: none;
  stroke: var(--color-text);
  stroke-width: 1px;
}

.ridge__overlay {
  fill: none;
  stroke: var(--color-background);
  stroke-opacity: 0.5;
  stroke-width: 1px;
}

.annotation__background {
  fill: var(--color-accent);
}

.annotation__text {
  font-weight: bold;
  font-size: var(--font-size-vis-lg);
}

.city__anchor,
.city__background {
  fill: var(--color-accent);
}

.city__connector {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 2px;
}

.city__name {
  font-weight: 700;
}