simple.css

/* Branched 2024-12-31 from https://github.com/kevquirk/simple.css
*/

/* Applies to this CSS file:

MIT License

Copyright (c) 2020 Simple.css (Kev Quirk)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

/* Global variables. */
:root {
  /* Set sans-serif & mono fonts */
  --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir,
    "Nimbus Sans L", Roboto, "Noto Sans", "Segoe UI", Arial, Helvetica,
    "Helvetica Neue", sans-serif;
  --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
  --standard-border-radius: 5px;

  /* Default (light) theme */
  --bg: #fff;
  --accent-bg: #f5f7ff;
  --text: #212121;
  --text-light: #585858;
  --border: #898EA4;
  --accent: #0d47a1;
  --accent-hover: #1266e2;
  --accent-text: var(--bg);
  --code: #d81b60;
  --preformatted: #444;
  --marked: #ffdd33;
  --disabled: #efefef;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #212121;
    --accent-bg: #2b2b2b;
    --text: #dcdcdc;
    --text-light: #ababab;
    --accent: #ffb300;
    --accent-hover: #ffe099;
    --accent-text: var(--bg);
    --code: #f06292;
    --preformatted: #ccc;
    --disabled: #111;
  }
  /* Add a bit of transparency so light media isn't so glaring in dark mode */
  img,
  video {
    opacity: 0.8;
  }
}

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

/* Reset default appearance */
textarea,
select,
input,
progress {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

html {
  /* Set the font globally */
  font-family: var(--sans-font);
  scroll-behavior: smooth;
}

/* Make the body a nice central block */
body {
  color: var(--text);
  background-color: var(--bg);
  font-size: 1.15rem;
  line-height: 1.5;
  display: grid;
  grid-template-columns: 1fr min(45rem, 90%) 1fr;
  margin: 0;
}
body > * {
  grid-column: 2;
}

/* Make the header bg full width, but the content inline with body */
body > header {
  background-color: var(--accent-bg);
  border-bottom: 1px solid var(--border);
  text-align: center;
  padding: 0 0.5rem 2rem 0.5rem;
  grid-column: 1 / -1;
}

body > header > *:only-child {
  margin-block-start: 2rem;
}

body > header h1 {
  max-width: 1200px;
  margin: 1rem auto;
}

body > header p {
  max-width: 40rem;
  margin: 1rem auto;
}

/* Add a little padding to ensure spacing is correct between content and header > nav */
main {
  padding-top: 1.5rem;
}

body > footer {
  margin-top: 4rem;
  padding: 2rem 1rem 1.5rem 1rem;
  color: var(--text-light);
  font-size: 0.9rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

/* Format headers */
h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.6rem;
  margin-top: 3rem;
}

h3 {
  font-size: 2rem;
  margin-top: 3rem;
}

h4 {
  font-size: 1.44rem;
}

h5 {
  font-size: 1.15rem;
}

h6 {
  font-size: 0.96rem;
}

p {
  margin: 1.5rem 0;
}

/* Prevent long strings from overflowing container */
p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* Fix line height when title wraps */
h1,
h2,
h3 {
  line-height: 1.1;
}

/* Reduce header size on mobile */
/*
@media only screen and (max-width: 720px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2.1rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  h4 {
    font-size: 1.25rem;
  }
}
*/

/* Format links & buttons */
a,
a:visited {
  color: var(--accent);
}

a:hover {
  text-decoration: none;
}

button,
.button,
a.button, /* extra specificity to override a */
input[type="submit"],
input[type="reset"],
input[type="button"] {
  border: 1px solid var(--accent);
  background-color: var(--accent);
  color: var(--accent-text);
  padding: 0.5rem 0.9rem;
  text-decoration: none;
  line-height: normal;
}

.button[aria-disabled="true"], 
input:disabled,
textarea:disabled,
select:disabled,
button[disabled] {
  cursor: not-allowed;
  background-color: var(--disabled);
  border-color: var(--disabled);
  color: var(--text-light);
}

input[type="range"] {
  padding: 0;
}

/* Set the cursor to '?' on an abbreviation and style the abbreviation to show that there is more information underneath */
abbr[title] {
  cursor: help;
  text-decoration-line: underline;
  text-decoration-style: dotted;
}

button:enabled:hover,
.button:not([aria-disabled="true"]):hover,
input[type="submit"]:enabled:hover,
input[type="reset"]:enabled:hover,
input[type="button"]:enabled:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  cursor: pointer;
}

.button:focus-visible,
button:focus-visible:where(:enabled),
input:enabled:focus-visible:where(
  [type="submit"],
  [type="reset"],
  [type="button"]
) {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* Format navigation */
header > nav {
  font-size: 1rem;
  line-height: 2;
  padding: 1rem 0 0 0;
}

/* Use flexbox to allow items to wrap, as needed */
header > nav ul,
header > nav ol {
  align-content: space-around;
  align-items: center;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

/* List items are inline elements, make them behave more like blocks */
header > nav ul li,
header > nav ol li {
  display: inline-block;
}

header > nav a,
header > nav a:visited {
  margin: 0 0.5rem 1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--standard-border-radius);
  color: var(--text);
  display: inline-block;
  padding: 0.1rem 1rem;
  text-decoration: none;
}

header > nav a:hover,
header > nav a.current,
header > nav a[aria-current="page"],
header > nav a[aria-current="true"] {
  border-color: var(--accent);
  color: var(--accent);
  cursor: pointer;
}

/* Reduce nav side on mobile */
@media only screen and (max-width: 720px) {
  header > nav a {
    border: none;
    padding: 0;
    text-decoration: underline;
    line-height: 1;
  }
}

/* Consolidate box styling */
aside, details, pre, progress {
  background-color: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: var(--standard-border-radius);
  margin-bottom: 1rem;
}

aside {
  font-size: 1rem;
  width: 30%;
  padding: 0 15px;
  margin-inline-start: 15px;
  float: right;
}
*[dir="rtl"] aside {
  float: left;
}

/* Make aside full-width on mobile */
@media only screen and (max-width: 720px) {
  aside {
    width: 100%;
    float: none;
    margin-inline-start: 0;
  }
}

article, fieldset, dialog {
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: var(--standard-border-radius);
  margin-bottom: 1rem;
}

article h2:first-child,
section h2:first-child,
article h3:first-child,
section h3:first-child {
  margin-top: 1rem;
}

section {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2rem 1rem;
  margin: 3rem 0;
}

/* Don't double separators when chaining sections */
section + section,
section:first-child {
  border-top: 0;
  padding-top: 0;
}

section + section {
  margin-top: 0;
}

section:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

details {
  padding: 0.7rem 1rem;
}

summary {
  cursor: pointer;
  font-weight: bold;
  padding: 0.7rem 1rem;
  margin: -0.7rem -1rem;
  word-break: break-all;
}

details[open] > summary + * {
  margin-top: 0;
}

details[open] > summary {
  margin-bottom: 0.5rem;
}

details[open] > :last-child {
  margin-bottom: 0;
}

/* Format tables */
table {
  border-collapse: collapse;
  margin: 1.5rem 0;
}

figure > table {
  width: max-content;
  margin: 0;
}

td,
th {
  border: 1px solid var(--border);
  text-align: start;
  padding: 0.5rem;
}

th {
  background-color: var(--accent-bg);
  font-weight: bold;
}

tr:nth-child(even) {
  /* Set every other cell slightly darker. Improves readability. */
/*  background-color: var(--accent-bg); */
}

table caption {
  font-weight: bold;
  margin-bottom: 0.5rem;
}

/* Format forms */
textarea,
select,
input,
button,
.button {
  font-size: inherit;
  font-family: inherit;
  padding: 0.5rem;
  margin-bottom: 0.5rem;
  border-radius: var(--standard-border-radius);
  box-shadow: none;
  max-width: 100%;
  display: inline-block;
}
textarea,
select,
input {
  color: var(--text);
  background-color: var(--bg);
  border: 1px solid var(--border);
}
label {
  display: block;
}
textarea:not([cols]) {
  width: 100%;
}

/* Add arrow to drop-down */
select:not([multiple]) {
  background-image: linear-gradient(45deg, transparent 49%, var(--text) 51%),
    linear-gradient(135deg, var(--text) 51%, transparent 49%);
  background-position: calc(100% - 15px), calc(100% - 10px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-inline-end: 25px;
}
*[dir="rtl"] select:not([multiple]) {
  background-position: 10px, 15px;
}

/* checkbox and radio button style */
input[type="checkbox"],
input[type="radio"] {
  vertical-align: middle;
  position: relative;
  width: min-content;
}

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

input[type="radio"] {
  border-radius: 100%;
}

input[type="checkbox"]:checked,
input[type="radio"]:checked {
  background-color: var(--accent);
}

input[type="checkbox"]:checked::after {
  /* Creates a rectangle with colored right and bottom borders which is rotated to look like a check mark */
  content: " ";
  width: 0.18em;
  height: 0.32em;
  border-radius: 0;
  position: absolute;
  top: 0.05em;
  left: 0.17em;
  background-color: transparent;
  border-right: solid var(--bg) 0.08em;
  border-bottom: solid var(--bg) 0.08em;
  font-size: 1.8em;
  transform: rotate(45deg);
}
input[type="radio"]:checked::after {
  /* creates a colored circle for the checked radio button  */
  content: " ";
  width: 0.25em;
  height: 0.25em;
  border-radius: 100%;
  position: absolute;
  top: 0.125em;
  background-color: var(--bg);
  left: 0.125em;
  font-size: 32px;
}

/* Makes input fields wider on smaller screens */
@media only screen and (max-width: 720px) {
  textarea,
  select,
  input {
    width: 100%;
  }
}

/* Set a height for color input */
input[type="color"] {
  height: 2.5rem;
  padding:  0.2rem;
}

/* do not show border around file selector button */
input[type="file"] {
  border: 0;
}

/* Misc body elements */
hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 1rem auto;
}

mark {
  padding: 2px 5px;
  border-radius: var(--standard-border-radius);
  background-color: var(--marked);
  color: black;
}

mark a {
  color: #0d47a1;
}

img,
video {
  max-width: 100%;
  height: auto;
  border-radius: var(--standard-border-radius);
}

figure {
  margin: 0;
  display: block;
  overflow-x: auto;
}

figure > img,
figure > picture > img {
  display: block;
  margin-inline: auto;
}

figcaption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-light);
  margin-block: 1rem;
}

blockquote {
  margin-inline-start: 2rem;
  margin-inline-end: 0;
  margin-block: 2rem;
  padding: 0.4rem 0.8rem;
  border-inline-start: 0.35rem solid var(--accent);
  color: var(--text-light);
/*  font-style: italic; */
}

cite {
  font-size: 0.9rem;
  color: var(--text-light);
  font-style: normal;
}

dt {
    color: var(--text-light);
}

/* Use mono font for code elements */
code,
pre,
pre span,
kbd,
samp {
  font-family: var(--mono-font);
  color: var(--code);
}

kbd {
  color: var(--preformatted);
  border: 1px solid var(--preformatted);
  border-bottom: 3px solid var(--preformatted);
  border-radius: var(--standard-border-radius);
  padding: 0.1rem 0.4rem;
}

pre {
  padding: 1rem 1.4rem;
  max-width: 100%;
  overflow: auto;
  color: var(--preformatted);
}

/* Fix embedded code within pre */
pre code {
  color: var(--preformatted);
  background: none;
  margin: 0;
  padding: 0;
}

/* Progress bars */
/* Declarations are repeated because you */
/* cannot combine vendor-specific selectors */
progress {
  width: 100%;
}

progress:indeterminate {
  background-color: var(--accent-bg);
}

progress::-webkit-progress-bar {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent-bg);
}

progress::-webkit-progress-value {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent);
}

progress::-moz-progress-bar {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent);
  transition-property: width;
  transition-duration: 0.3s;
}

progress:indeterminate::-moz-progress-bar {
  background-color: var(--accent-bg);
}

dialog {
  background-color: var(--bg);
  max-width: 40rem;
  margin: auto;
}

dialog::backdrop {
  background-color: var(--bg);
  opacity: 0.8;
}

@media only screen and (max-width: 720px) {
  dialog {
    max-width: 100%;
    margin: auto 1em;
  }
}

/* Superscript & Subscript */
/* Prevent scripts from affecting line-height. */
sup, sub {
  vertical-align: baseline;
  position: relative;
}

sup {
  top: -0.4em;
}

sub { 
  top: 0.3em; 
}

/* Classes for notices */
.notice {
  background: var(--accent-bg);
  border: 2px solid var(--border);
  border-radius: var(--standard-border-radius);
  padding: 1.5rem;
  margin: 2rem 0;
}

/* Print */
@media print {
  @page {
    margin: 1cm;
  }
  body {
    display: block;
  }
  body > header {
    background-color: unset;
  }
  body > header nav,
  body > footer {
    display: none;
  }
  article {
    border: none;
    padding: 0;
  }
  a[href^="http"]::after {
    content: " <" attr(href) ">";
  }
  abbr[title]:after {
    content: " (" attr(title) ")";
  }
  a {
    text-decoration: none;
  }
  p {
    widows: 3;
    orphans: 3;
  }
  hr {
    border-top: 1px solid var(--border);
  }
  mark {
    border: 1px solid var(--border);
  }
  pre, table, figure, img, svg {
    break-inside: avoid;
  }
  pre code {
    white-space: pre-wrap;
  }
}