.layout {
  --max-content-width: 800px;
  --min-content-width: 550px;
  --nav-width: 200px;
  --content-margin: 16px;
  --container-padding: 12px;

  --grid-gutter: calc(var(--content-margin) + var(--container-padding));
  --grid-min-center-width: calc(var(--min-content-width) + 2 * var(--grid-gutter));
  --grid-max-center-width: calc(var(--max-content-width) + 2 * var(--grid-gutter));

  --grid-left: min(var(--nav-width), calc(.2 * 100vw));
  --grid-right: min(var(--nav-width), calc(100vw - 2 * var(--container-padding) - var(--nav-width) - var(--grid-min-center-width)));

  max-width: calc(2 * var(--nav-width) + var(--grid-max-center-width));
  width: calc(100vw - 2 * var(--container-padding));
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--grid-left) 1fr var(--grid-right);
  grid-template-rows: repeat(3, auto);
  column-gap: var(--grid-gutter);
  row-gap: var(--grid-gutter);
}

.layout > *:not(main) {
  color: white;
}

.layout header {
  display: flex;
  grid-row: 1 / 2;
  grid-column: 2 / 3;
  padding: var(--container-padding) 0;
}

.layout nav {
  grid-row: 2 / 3;
  grid-column: 1 / 2;
}

.layout main {
  grid-row: 2 / 3;
  grid-column: 2 / 3;
  padding: var(--container-padding);
  margin: 0 -16px;
  background: white;
  box-shadow: 0px 0px 8px #00000066;
  border: solid 12px #ffffffcc;
  background-clip: padding-box;
}

.layout footer {
  grid-column: 2 / 3;
  grid-row: 3 / 4;
  padding: var(--container-padding) 0;
}