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Import existing tesseras.net website content.

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+/* Base styles and content styles */
+
+:root {
+    /* Browser default font-size is 16px, this way 1 rem = 10px */
+    font-size: 62.5%;
+    color-scheme: var(--color-scheme);
+}
+
+html {
+    font-family: "Open Sans", sans-serif;
+    color: var(--fg);
+    background-color: var(--bg);
+    text-size-adjust: none;
+    -webkit-text-size-adjust: none;
+}
+
+body {
+    margin: 0;
+    font-size: 1.6rem;
+    overflow-x: hidden;
+}
+
+code {
+    font-family: var(--mono-font) !important;
+    font-size: var(--code-font-size);
+    direction: ltr !important;
+}
+
+/* make long words/inline code not x overflow */
+main {
+    overflow-wrap: break-word;
+}
+
+/* make wide tables scroll if they overflow */
+.table-wrapper {
+    overflow-x: auto;
+}
+
+/* Don't change font size in headers. */
+h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
+    font-size: unset;
+}
+
+.left { float: left; }
+.right { float: right; }
+.boring { opacity: 0.6; }
+.hide-boring .boring { display: none; }
+.hidden { display: none !important; }
+
+h2, h3 { margin-block-start: 2.5em; }
+h4, h5 { margin-block-start: 2em; }
+
+.header + .header h3,
+.header + .header h4,
+.header + .header h5 {
+    margin-block-start: 1em;
+}
+
+h1:target::before,
+h2:target::before,
+h3:target::before,
+h4:target::before,
+h5:target::before,
+h6:target::before,
+dt:target::before {
+    display: inline-block;
+    content: "»";
+    margin-inline-start: -30px;
+    width: 30px;
+}
+
+/* This is broken on Safari as of version 14, but is fixed
+   in Safari Technology Preview 117 which I think will be Safari 14.2.
+   https://bugs.webkit.org/show_bug.cgi?id=218076
+*/
+:target {
+    /* Safari does not support logical properties */
+    scroll-margin-top: calc(var(--menu-bar-height) + 0.5em);
+}
+
+.page {
+    outline: 0;
+    padding: 0 var(--page-padding);
+    margin-block-start: calc(0px - var(--menu-bar-height)); /* Compensate for the #mdbook-menu-bar-hover-placeholder */
+}
+.page-wrapper {
+    box-sizing: border-box;
+    background-color: var(--bg);
+}
+html:not(.js) .page-wrapper,
+.js:not(.sidebar-resizing) .page-wrapper {
+    transition: margin-left 0.3s ease, transform 0.3s ease; /* Animation: slide away */
+}
+[dir=rtl]:not(.js) .page-wrapper,
+[dir=rtl].js:not(.sidebar-resizing) .page-wrapper {
+    transition: margin-right 0.3s ease, transform 0.3s ease; /* Animation: slide away */
+}
+
+.content {
+    overflow-y: auto;
+    padding: 0 5px 50px 5px;
+}
+.content main {
+    margin-inline-start: auto;
+    margin-inline-end: auto;
+    max-width: var(--content-max-width);
+}
+.content p { line-height: 1.45em; }
+.content ol { line-height: 1.45em; }
+.content ul { line-height: 1.45em; }
+.content a { text-decoration: none; }
+.content a:hover { text-decoration: underline; }
+.content img, .content video { max-width: 100%; }
+.content .header:link,
+.content .header:visited {
+    color: var(--fg);
+}
+.content .header:link,
+.content .header:visited:hover {
+    text-decoration: none;
+}
+
+table {
+    margin: 0 auto;
+    border-collapse: collapse;
+}
+table td {
+    padding: 3px 20px;
+    border: 1px var(--table-border-color) solid;
+}
+table thead {
+    background: var(--table-header-bg);
+}
+table thead td {
+    font-weight: 700;
+    border: none;
+}
+table thead th {
+    padding: 3px 20px;
+}
+table thead tr {
+    border: 1px var(--table-header-bg) solid;
+}
+/* Alternate background colors for rows */
+table tbody tr:nth-child(2n) {
+    background: var(--table-alternate-bg);
+}
+
+
+blockquote {
+    margin: 20px 0;
+    padding: 0 20px;
+    color: var(--fg);
+    background-color: var(--quote-bg);
+    border-block-start: .1em solid var(--quote-border);
+    border-block-end: .1em solid var(--quote-border);
+}
+
+/* TODO: Remove .warning in a future version of mdbook, it is replaced by
+blockquote tags. */
+.warning {
+    margin: 20px;
+    padding: 0 20px;
+    border-inline-start: 2px solid var(--warning-border);
+}
+
+.warning:before {
+    position: absolute;
+    width: 3rem;
+    height: 3rem;
+    margin-inline-start: calc(-1.5rem - 21px);
+    content: "ⓘ";
+    text-align: center;
+    background-color: var(--bg);
+    color: var(--warning-border);
+    font-weight: bold;
+    font-size: 2rem;
+}
+
+blockquote .warning:before {
+    background-color: var(--quote-bg);
+}
+
+kbd {
+    background-color: var(--table-border-color);
+    border-radius: 4px;
+    border: solid 1px var(--theme-popup-border);
+    box-shadow: inset 0 -1px 0 var(--theme-hover);
+    display: inline-block;
+    font-size: var(--code-font-size);
+    font-family: var(--mono-font);
+    line-height: 10px;
+    padding: 4px 5px;
+    vertical-align: middle;
+}
+
+sup {
+    /* Set the line-height for superscript and footnote references so that there
+       isn't an awkward space appearing above lines that contain the footnote.
+
+       See https://github.com/rust-lang/mdBook/pull/2443#discussion_r1813773583
+       for an explanation.
+    */
+    line-height: 0;
+}
+
+.footnote-definition {
+    font-size: 0.9em;
+}
+/* The default spacing for a list is a little too large. */
+.footnote-definition ul,
+.footnote-definition ol {
+    padding-left: 20px;
+}
+.footnote-definition > li {
+    /* Required to position the ::before target */
+    position: relative;
+}
+.footnote-definition > li:target {
+    scroll-margin-top: 50vh;
+}
+.footnote-reference:target {
+    scroll-margin-top: 50vh;
+}
+/* Draws a border around the footnote (including the marker) when it is selected.
+   TODO: If there are multiple linkbacks, highlight which one you just came
+   from so you know which one to click.
+*/
+.footnote-definition > li:target::before {
+    border: 2px solid var(--footnote-highlight);
+    border-radius: 6px;
+    position: absolute;
+    top: -8px;
+    right: -8px;
+    bottom: -8px;
+    left: -32px;
+    pointer-events: none;
+    content: "";
+}
+/* Pulses the footnote reference so you can quickly see where you left off reading.
+   This could use some improvement.
+*/
+@media not (prefers-reduced-motion) {
+    .footnote-reference:target  {
+        animation: fn-highlight 0.8s;
+        border-radius: 2px;
+    }
+
+    @keyframes fn-highlight {
+        from {
+            background-color: var(--footnote-highlight);
+        }
+    }
+}
+
+.tooltiptext {
+    position: absolute;
+    visibility: hidden;
+    color: #fff;
+    background-color: #333;
+    transform: translateX(-50%); /* Center by moving tooltip 50% of its width left */
+    left: -8px; /* Half of the width of the icon */
+    top: -35px;
+    font-size: 0.8em;
+    text-align: center;
+    border-radius: 6px;
+    padding: 5px 8px;
+    margin: 5px;
+    z-index: 1000;
+}
+.tooltipped .tooltiptext {
+    visibility: visible;
+}
+
+.chapter li.part-title {
+    color: var(--sidebar-fg);
+    margin: 5px 0px;
+    font-weight: bold;
+}
+
+.result-no-output {
+    font-style: italic;
+}
+
+.fa-svg svg {
+    width: 1em;
+    height: 1em;
+    fill: currentColor;
+    margin-bottom: -0.1em;
+}
+
+dt {
+    font-weight: bold;
+    margin-top: 0.5em;
+    margin-bottom: 0.1em;
+}
+
+/* This uses a CSS counter to add numbers to definitions, but only if there is
+ more than one definition. */
+dl, dt {
+    counter-reset: dd-counter;
+}
+
+/* When there is more than one definition, increment the counter. The first
+selector selects the first definition, and the second one selects definitions
+2 and beyond.*/
+dd:has(+ dd), dd + dd {
+    counter-increment: dd-counter;
+    /* Use flex display to help with positioning the numbers when there is a p
+    tag inside the definition. */
+    display: flex;
+    align-items: flex-start;
+}
+
+/* Shows the counter for definitions. The first selector selects the first
+definition, and the second one selections definitions 2 and beyond.*/
+dd:has(+ dd)::before, dd + dd::before  {
+    content: counter(dd-counter) ". ";
+    font-weight: 600;
+    display: inline-block;
+    margin-right: 0.5em;
+}
+
+dd > p {
+    /* For loose definitions that have a p tag inside, don't add a bunch of
+    space before the definition. */
+    margin-top: 0;
+}
+
+/* Remove some excess space from the bottom. */
+.blockquote-tag p:last-child {
+    margin-bottom: 2px;
+}
+
+.blockquote-tag {
+    /* Add some padding to make the vertical bar a little taller than the text.*/
+    padding: 2px 0px 2px 20px;
+    /* Add a solid color bar on the left side. */
+    border-inline-start-style: solid;
+    border-inline-start-width: 4px;
+    /* Disable the background color from normal blockquotes . */
+    background-color: inherit;
+    /* Disable border blocks from blockquotes. */
+    border-block-start: none;
+    border-block-end: none;
+}
+
+.blockquote-tag-title svg {
+    fill: currentColor;
+    /* Add space between the icon and the title. */
+    margin-right: 8px;
+}
+
+.blockquote-tag-note {
+    border-inline-start-color: var(--blockquote-note-color);
+}
+
+.blockquote-tag-tip {
+    border-inline-start-color: var(--blockquote-tip-color);
+}
+
+.blockquote-tag-important {
+    border-inline-start-color: var(--blockquote-important-color);
+}
+
+.blockquote-tag-warning {
+    border-inline-start-color: var(--blockquote-warning-color);
+}
+
+.blockquote-tag-caution {
+    border-inline-start-color: var(--blockquote-caution-color);
+}
+
+.blockquote-tag-note .blockquote-tag-title {
+    color: var(--blockquote-note-color);
+}
+
+.blockquote-tag-tip .blockquote-tag-title {
+    color: var(--blockquote-tip-color);
+}
+
+.blockquote-tag-important .blockquote-tag-title {
+    color: var(--blockquote-important-color);
+}
+
+.blockquote-tag-warning .blockquote-tag-title {
+    color: var(--blockquote-warning-color);
+}
+
+.blockquote-tag-caution .blockquote-tag-title {
+    color: var(--blockquote-caution-color);
+}
+
+.blockquote-tag-title {
+    /* Slightly increase the weight for more emphasis. */
+    font-weight: 600;
+    /* Vertically center the icon with the text. */
+    display: flex;
+    align-items: center;
+    /* Remove default large margins for a more compact display. */
+    margin: 2px 0 8px 0;
+}
+
+.blockquote-tag-title .fa-svg {
+    fill: currentColor;
+    /* Add some space between the icon and the text. */
+    margin-right: 8px;
+}