:root {
  --font-sans: sans-serif;
  --font-mono: monospace;

  --bg-color: white;
  --text-color: black;
  --border-color: grey;
  --ui-color: gainsboro;
  --ui-color-hover: lightgrey;
  --links-color: blue;
  --ok-color: green;
  --error-color: red;

  --code-color: firebrick;
  --marked-color: gold;

  --border-size: 1px;
  --border-radius: 4px;
  --padding-size: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --bg-color: black;
    --text-color: whitesmoke;
    --border-color: grey;
    --ui-color: dimgrey;
    --ui-color-hover: grey;
    --links-color: lightblue;
    --error-color: red;
    --ok-color: lightgreen;

    --code-color: lightpink;
    --marked-color: gold;
  }
}



@media print {
  header, main, footer {
    display: none !important;
  }
}

@media screen {
  .print {
    display: none;
  }
}

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

html {
  font-family: var(--font-sans);
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  color: var(--text-color);
  background-color: var(--bg-color);
  
  max-width: 1200px;
  margin: 0 auto;
  overflow-x: hidden;
  padding: 0 var(--padding-size);
  line-height: 1.5;
}

body>header {
  background-color: var(--ui-color);
  padding: calc(var(--padding-size) * 1) 0;
  margin: 0 calc(50% - 50vw);
  padding-left: calc(50vw - 50%);
  padding-right: calc(50vw - 50%);
}

h1 {
  text-transform: uppercase;
}


body>header>h1,
body>header>p {
  margin: 0;
}

body>header>h1 {
  display: inline-block;
  line-height: normal;
  vertical-align: baseline;
  font-size: 2rem;
}

body>header a.button {
  margin-left: -0.5rem;
  margin-bottom: 0;
  padding: 0.5rem;
  font-weight: bold;
  font-size: 2rem;
}

body>header a.button:hover {
  text-decoration: line-through;
}


body>footer {
  padding: var(--padding-size);
  text-align: center;
}


main {
  padding: var(--padding-size) 0;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: var(--padding-size);
}

section {
  width: 100%;
}

article {
  border-radius: var(--border-radius);
  padding: 0;
  flex: 1;
}


a,
a:visited {
  color: var(--links-color);
}

a:hover {
  text-decoration: none;
}

textarea,
input,
select,
button,
a.button {
  font-size: inherit;
  font-family: inherit;
  max-width: 100%;
  border: var(--border-size) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.5rem;
  margin-bottom: var(--padding-size);
  display: inline-block;
}

button,
a.button,
input[type="submit"],
input[type="reset"],
input[type="button"] {
  font-size: inherit;
  font-family: inherit;
  display: inline-block;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--ui-color);
  color: var(--text-color) !important;
  padding: 0.5rem 1rem;
  text-decoration: none;
  line-height: normal;
  cursor: pointer;
}

button:hover,
a.button:hover,
input[type="color"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover,
input[type="button"]:hover {
  background-color: var(--ui-color-hover);
}

button:active,
a.button:active,
input[type="submit"]:active,
input[type="reset"]:active,
input[type="button"]:active,
input[type="color"]:active {
  background-color: var(--ui-color);
}

.disabled, .disabled * {
  pointer-events: none;
  color: var(--border-color) !important;
  border: none;
}

input[type="color"] {
  height: 2.2rem;
  padding: 0.2rem;
  margin: 0;
  border: 0;
  vertical-align: middle;
  background-color: var(--ui-color);
  cursor: pointer;
}

input[type="time"] {
  margin: 0;
  vertical-align: middle;
}


label {
  line-height: normal;
  padding: 0;
  margin: 0;

}

input[type="checkbox"],
input[type="radio"] {
  height: 1rem;
  width: 1rem;
}

input[type="checkbox"]+label,
input[type="radio"]+label,
label+input[type="radio"] {
  display: inline-block;
}


input[type="file"] {
  border: 0;
}

textarea {
  width: 100%;
  resize: vertical;
}

figure,
fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

figcaption {
  font-size: 0.9rem;
  color: var(--border-color);
  margin-bottom: var(--padding-size);
  word-break: break-all;
}

details {
  background-color: var(--ui-color);
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  padding: 0.5rem 1rem;
}

summary {
  cursor: pointer;
  font-weight: bold;
  padding: 0.5rem 1rem;
  margin: -0.5rem -1rem;
  word-break: break-all;
}

kbd {
  border: 1px solid var(--border-color);
  border-bottom: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.1rem 0.4rem;
}

code {
  font-family: monospace;
  color: var(--code-color);
}


.error {
  color: var(--error-color) !important;
}

.ok::after {
  content: "✓";
  margin-left: 0.5rem;
  color: var(--ok-color);
}

p.print {
  white-space: pre-wrap;
  word-break: break-all;
  font-size: 12pt;
}

.hidden {
  display: none;
}

.expand {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh !important;
  width: 100vw !important;
  outline: none;
  border: 0;
  resize: none;
}

.expand-body {
  overflow: hidden;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

hr {
  border: 0;
  border-bottom: var(--border-size) solid var(--border-color);
  background: none;
  margin: 1rem auto;
}