:root {
  --color-background: #2E3436;
  --color-foreground: #D3D7CF;
  --color-blue-light: #9CD9F0;
  --color-blue-dark: #72B3CC;
  --color-black-light: #5D5D5D;
  --color-black-dark: #000000;
  --color-white-light: #F7F7F7;
  --color-white-dark: #B0B0B0;
  --spacing-elements: 1rem;
  --width-border-default: 0.2rem;
  --width-sidebar-max: 15rem;
  --font-family-default: "DejaVu Sans Mono", "Menlo", "Consolas", monospace;
  --font-family-headlines: "Montserrat", "Avenir", "Roboto", sans-serif; }

body {
  font-family: var(--font-family-default);
  background: --color-background;
  color: --color-foreground;
  margin: 0;
  padding: 0; }

h1 {
  color: var(--color-blue-dark);
  font-family: var(--font-family-headlines);
  font-weight: 300;
  letter-spacing: .14em;
  word-spacing: .3em; }

a {
  color: var(--color-wihte-light);
  text-decoration: underline; }
  a:active, a:visited {
    color: var(--color-wihte-light); }
  a:hover {
    color: var(--color-black-dark);
    background: var(--color-blue-light); }

body > header {
  padding: var(--spacing-elements);
  border-bottom: var(--color-blue-light) solid var(--width-border-default); }
  body > header h1 {
    margin: 0; }

body > main > nav {
  border-right: var(--color-blue-light) solid var(--width-border-default); }
  body > main > nav a {
    display: block;
    padding: var(--spacing-elements); }

body > main > section {
  padding: var(--spacing-elements); }
  body > main > section header h1 {
    margin: 0; }

body > footer {
  padding: var(--spacing-elements);
  border-top: var(--color-blue-light) solid var(--width-border-default); }

body > main {
  display: grid;
  grid-template-columns: var(--width-sidebar-max) calc(100% - var(--width-sidebar-max)); }