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

body {
  -webkit-font-smoothing: antialiased;
}

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

input,
button,
textarea,
select {
  font: inherit;
}

ul,
ol {
  list-style: none;
}

a {
  color: currentColor;
}

/* Typography */
:root {
  --font-size-sm: clamp(0.8rem, 0.25vi + 0.74rem, 0.94rem);
  --font-size-base: clamp(1rem, 0.45vi + 0.89rem, 1.25rem);
  --font-size-md: clamp(1.25rem, 0.76vi + 1.06rem, 1.67rem);
  --font-size-lg: clamp(1.56rem, 1.2vi + 1.26rem, 2.22rem);
  --font-size-xl: clamp(1.95rem, 1.83vi + 1.5rem, 2.96rem);
  --font-size-xxl: clamp(2.44rem, 2.74vi + 1.76rem, 3.95rem);
  --font-size-xxxl: clamp(3.05rem, 4.02vi + 2.05rem, 5.26rem);

  --font-size-vis-xs: 10px;
  --font-size-vis-sm: 12px;
  --font-size-vis-base: 14px;

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

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

  --line-height-body: 1.5;
  --line-height-header: 0.85;
  --line-height-subheader: 1;

  --color-background: #333464;
  --color-text: #e7e7e7;
  --color-accent: #01a6af;
}

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

h1 {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-header);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
}

hgroup p {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-subheader);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

hgroup small {
  font-size: var(--font-size-base);
}

footer {
  font-size: var(--font-size-sm);
}

.figure {
  font-size: var(--font-size-vis-base);
}

/* Layout */
main {
  position: relative;
  margin: 4rem auto;
  width: min(65rem, 100% - 2rem);
}

main > * + * {
  margin-block-start: var(--spacer, 1lh);
}

@media (width > 30rem) {
  hgroup {
    position: absolute;
  }
}

/* Visualization */
.layered-area-chart {
  display: flex;
  justify-content: center;
  font-variant-numeric: tabular-nums;
}

.tick__line {
  stroke: var(--color-text);
  stroke-opacity: 0.25;
}

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

.series__area {
  fill: var(--color-accent);
  fill-opacity: 0.25;
}

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

.series__name {
  fill: var(--color-text);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

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