frontend: simple.css: Use copy of upstream code

This switches from the use of a Git submodule to a locally committed
copy of the needed file and it's license.

The reason is that `hugo server` needs the CSS file in the same relative
path as `hugo build` which is run in the build tree.

But this is not possible because Meson cannot copy it to the
`build/frontend/simple.css` folder without a `meson.build` in
`source/frontend/simple.css`.

This together with the limitation that symbolic links are not supported
by Hugo makes life pretty difficult. Thus a local copy of simple.css and
an adjacent `meson.build` file is chosen.

9 files changed, 795 insertions, 3 deletions

diff --git a/frontend/hugo.toml b/frontend/hugo.toml
index 0fdee53..65aa77a 100644
--- a/frontend/hugo.toml
+++ b/frontend/hugo.toml
@@ -2,3 +2,7 @@ baseURL = 'http://localhost:8000/'
 locale = 'en-gb'
 title = 'finserv'
 disableKinds = ["taxonomy", "sitemap", "rss"]
+
+[[module.mounts]]
+source = "simple.css/simple.css"
+target = "static/simple.css"
diff --git a/frontend/meson.build b/frontend/meson.build
index 6af84e5..4496b22 100644
--- a/frontend/meson.build
+++ b/frontend/meson.build
@@ -11,7 +11,7 @@ foreach hugo_source : [
 endforeach
 
 subdir('layouts')
-subdir('static')
+subdir('simple.css')
 
 frontend = custom_target(
   output : 'public',
diff --git a/frontend/simple.css b/frontend/simple.css
deleted file mode 160000
-Subproject b6eab64c47692afd18c50bab0d5e656fd51d169
diff --git a/frontend/simple.css/LICENSE b/frontend/simple.css/LICENSE
new file mode 100644
index 0000000..c496ecf
--- /dev/null
+++ b/frontend/simple.css/LICENSE
@@ -0,0 +1,21 @@
+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.
diff --git a/frontend/simple.css/README.md b/frontend/simple.css/README.md
new file mode 100644
index 0000000..c2c3c0f
--- /dev/null
+++ b/frontend/simple.css/README.md
@@ -0,0 +1,7 @@
+This is a local copy of `simple.css` from [here][1].
+
+The original license is added too.
+
+The used version is `2.3.7`.
+
+[1]: https://codeberg.org/kevquirk/simple.css
diff --git a/frontend/simple.css/meson.build b/frontend/simple.css/meson.build
new file mode 100644
index 0000000..19b2df4
--- /dev/null
+++ b/frontend/simple.css/meson.build
@@ -0,0 +1,5 @@
+foreach hugo_source : [
+  'simple.css',
+]
+  hugo_source_targets += fs.copyfile(hugo_source)
+endforeach
diff --git a/frontend/simple.css/simple.css b/frontend/simple.css/simple.css
new file mode 100644
index 0000000..2e53116
--- /dev/null
+++ b/frontend/simple.css/simple.css
@@ -0,0 +1,757 @@
+/* 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;
+  --border-width: 1px;
+
+  /* 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: var(--border-width) 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: var(--border-width) 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: var(--border-width) 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: var(--border-width) 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: var(--border-width) 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: var(--border-width) 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: var(--border-width) solid var(--border);
+  border-bottom: var(--border-width) 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: var(--border-width) 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: 0.5em;
+  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: var(--border-width) 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: 0.2em;
+  height: 0.4em;
+  border-radius: 0;
+  position: absolute;
+  top: 0.04em;
+  left: 0.18em;
+  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: 0.3em;
+  height: 0.3em;
+  border-radius: 100%;
+  position: absolute;
+  top: 0.125em;
+  background-color: var(--bg);
+  left: 0.125em;
+  font-size: 1.8em;
+}
+
+/* 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: var(--border-width);
+  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 {
+  position: sticky;
+  left: 0;
+  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: var(--border-width) 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: calc(100vw - 2rem);
+  }
+}
+
+/* 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: var(--border-width) 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: var(--border-width) solid var(--border);
+  }
+  mark {
+    border: var(--border-width) solid var(--border);
+  }
+  pre, table, figure, img, svg {
+    break-inside: avoid;
+  }
+  pre code {
+    white-space: pre-wrap;
+  }
+}
diff --git a/frontend/static/meson.build b/frontend/static/meson.build
deleted file mode 100644
index d7ee8fe..0000000
--- a/frontend/static/meson.build
+++ /dev/null
@@ -1 +0,0 @@
-hugo_source_targets += fs.copyfile('simple.css')
diff --git a/frontend/static/simple.css b/frontend/static/simple.css
deleted file mode 120000
index 8f905d1..0000000
--- a/frontend/static/simple.css
+++ /dev/null
@@ -1 +0,0 @@
-../simple.css/simple.css
\ No newline at end of file