/* 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;
}

/* Custom properties */
:root {
  --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-5xl: clamp(2.03rem, 4.12vi + 1rem, 4.29rem);

  --font-size-vis-xs: 10px;
  --font-size-vis-sm: 12px;
  --font-size-vis-base: 14px;
  --font-size-vis-lg: 16px;

  --font-family-header: "Titan One", sans-serif;
  --font-family-body: "Google Sans Flex", sans-serif;

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

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

  --color-background: #ffffff;
  --color-text: #020202;
  --color-tick: #dbdbdb;
  --color-accent: #ffda00;
}

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

h1 {
  font-family: var(--font-family-header);
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-header);
}

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

hgroup {
  display: grid;
  gap: 0.5em;
}

/* Layout */
main {
  margin-block: 4rem;
}

article {
  display: grid;
  grid-template-columns:
    [fullwidth-start] minmax(1rem, 1fr)
    [wider-start]minmax(0, 0.5fr)
    [wide-start] minmax(0.5rem, 0.25fr)
    [main-start] minmax(0, 70ch) [main-end]
    minmax(0.5rem, 0.25fr) [wide-end]
    minmax(0, 0.5fr) [wider-end]
    minmax(1rem, 1fr) [fullwidth-end];
  row-gap: 2rem;
}

article > * {
  grid-column: main;
}

.content--wide {
  grid-column: wide;
}

.content--wider {
  grid-column: wider;
}

.content--fullwidth {
  grid-column: fullwidth;
}

.content--intro {
  grid-column: wide-start / fullwidth-end;
  background-color: var(--color-accent);
  padding-block: 2rem;
  display: grid;
  grid-template-columns: subgrid;
}

hgroup {
  grid-column: main;
}

/* Heatmap */
.heatmap {
  font-size: var(--font-size-vis-base);
  font-variant-numeric: tabular-nums;
  display: flex;
  justify-content: center;

  > svg {
    overflow: visible;
  }

  text {
    fill: currentColor;
  }

  .tick line {
    stroke: var(--color-tick);
  }

  .rows {
    isolation: isolate;
  }

  .row__title {
    font-size: var(--font-size-vis-lg);
  }

  .legend__title,
  .column__header,
  .row__average {
    font-weight: var(--font-weight-bold);
  }

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

  .swatch__bubble,
  .cell__bubble {
    fill: var(--color-accent);
    mix-blend-mode: multiply;
  }
}