:root {
  --color-text: #121826;
  --color-text-dim: #6c727f;
  --color-border: #9ca3af;
  --color-border-dim: #e5e7eb;
  --color-background: #ffffff;
  --color-background-dim: rgb(249, 250, 251);
  --color-primary: #4e46dd;
  --border-radius: 4px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #fff;
    --color-text-dim: #9da3ae;
    --color-border: #4b5563;
    --color-border-dim: #212936;
    --color-background: #111827;
    --color-background-dim: #212936;
    --color-primary: #6466e9;
  }
}

/* Reset */

/* Box sizing rules */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Remove default margin */
* {
  margin: 0;
}

/* Prevent font size inflation */
html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
}

/* Remove default margin in favour of better control in authored CSS */
body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin-block-end: 0;
}

/* Remove list styles and padding on ul, ol elements */
ul,
ol {
  list-style: none;
  padding-inline: 0;
}

/* Set core body defaults */
body {
  min-height: 100vh;
  line-height: 1.5;
}

/* Set shorter line heights on headings and interactive elements */
h1,
h2,
h3,
h4,
button,
input,
label {
  line-height: 1.1;
}

/* Balance text wrapping on headings */
h1,
h2,
h3,
h4 {
  text-wrap: balance;
}

/* A elements that don't have a class get default styles */
a:not([class]) {
  text-decoration-skip-ink: auto;
  color: currentColor;
}

/* Make images easier to work with */
img,
picture {
  max-width: 100%;
  display: block;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* Composition */
body {
  font-family: system-ui, sans-serif;
  color: var(--color-text);
  background-color: var(--color-background);
}

h1,
h2 {
  font-weight: 700;
  letter-spacing: -0.025em;
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.25rem;
}

a:hover {
  text-decoration: none;
}

summary:hover {
  cursor: pointer;
}

details {
  margin-top: 1rem;
}

details p {
  background-color: var(--color-background-dim);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
}

p {
  margin-bottom: 0.3rem;
}

img {
  background: var(--color-background-dim);
}

li {
  margin-bottom: 0.6em;
}

dl {
  border-left: 1px solid var(--color-border-dim);
  margin-right: 4rem;
  padding-left: 0.75rem;
  display: inline-block;
}

dt {
  color: var(--color-text-dim);
  font-size: 0.875rem;
  font-weight: 500;
}

dd {
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 2.25rem;
}

form {
  display: flex;
  padding: 1.25em 1em;
}

input,
button {
  border-radius: var(--border-radius);
}

input {
  width: 100%;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--color-border);
  background: var(--color-background-dim);
}

button {
  margin-left: 0.5em;
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 0.75em 1.3em;
  cursor: pointer;
}

input:focus {
  outline: 1px solid var(--color-primary);
}

button:hover,
button:focus {
  background: #272eb5;
}

button:focus {
  outline-offset: 3px;
  outline: 1px solid var(--color-primary);
}

section {
  padding: 2.5rem 1em;
}

/* Utilities */
/* flow */
section > * + * {
  -webkit-margin-before: var(--flow-space, 1.5em);
  margin-block-start: var(--flow-space, 1.5em);
}

:is(h1, h2) {
  --flow-space: 0.6em;
}

.center {
  text-align: center;
}

.dim {
  color: var(--color-text-dim);
  font-weight: 500;
}

form,
section {
  max-width: 36em;
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--color-border-dim);
}

footer {
  border-top: 1px solid var(--color-border-dim);
  color: var(--color-text-dim);
  text-align: center;
  padding: 1em;
}

/* sticky footer */
html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

footer {
  flex-shrink: 0;
}