@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700&display=swap');

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

:root {
  --font-serif: 'Poppins', sans-serif;
  --paragraph: 1.4rem;
  --heading-primary: 6rem;
  --heading-secondary: 3rem;
  --optimal-reading-length: 60ch;

  --color-text: hsl(220, 20%, 98%);
  --color-background: hsl(220, 20%, 14%);
  --color-text-example: hsl(220, 20%, 80%);
  --color-inline-code: hsl(220, 20%, 10%);

  --line-height-tight: 1.2;
  --line-height-loose: 1.6;
  --spacing-1: 1rem;
  --spacing-2: 2rem;
  --border-image-radius: 1rem;
}

html {
  scroll-padding-top: var(--spacing-1);
  scroll-behavior: smooth;
}

body {
  padding: var(--spacing-1) var(--spacing-2);
  font-family: var(--font-serif);
  font-weight: 300;
  color: var(--color-text);
  background-color: var(--color-background);
}

.example {
  color: var(--color-text-example);
}

h1 {
  line-height: var(--line-height-tight);
}

h2 {
  margin: var(--spacing-2) 0;
}

p {
  margin: var(--spacing-2) 0;
  line-height: var(--line-height-loose);
}

ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  margin: var(--spacing-2) 0;
  line-height: var(--line-height-loose);
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  height: 100%;
  display: block;
  border-radius: var(--border-image-radius);
}

strong {
  font-weight: 600;
}

code {
  padding: 4px;
  background-color: var(--color-inline-code);
  border-radius: 4px;
}

@media (min-width: 540px) {
  body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
    max-width: var(--optimal-reading-length);
    margin: 0 auto;
    padding: var(--spacing-1) 0;
    font-size: var(--paragraph);
  }

  h1 {
    font-size: var(--heading-primary);
  }

  h2 {
    font-size: var(--heading-secondary);
  }
}