:root {
    --fore-color: #222;
    --back-color: #fdfbf7;
    --primary-fore-color: #0d2544;
    --primary-back-color: #98b8e3;
    --primary-border-color: #5b7ba6;
    --primary-hover-color: #b2cff5;
    --secondary-fore-color: #444;
    --secondary-back-color: #f0f0f0;
    --secondary-border-color: #ccc;
    --secondary-disabled-color: #ddd;
    --action-fore-color: #4d1111;
    --action-back-color: #f4c3c3;
    --action-border-color: #aa6b6b;
    --action-border-color: #fce1e1;
    --blockquote-color: #ccc;
    --pre-color: #1565c0;
    --pre-back-color: #ccc;
    --border-color: #aaa;
    --logo-color: #369;
    --accent-color: #888;
    --a-link-color: #444;
    --a-visited-color: #444;
    --a-hover-back: #ddd;
    --a-hover-color: #000;
    --tag-fore-color: #222;
    --tag-back-color: #eee;
    --heading-ratio: 1.1;
    --universal-margin: 0.5rem;
    --universal-padding: 0.5rem;
    --universal-border-radius: 0.125rem;
    --system-font:
        system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    --pre-font: Menlo, Consolas, monospace;
    --code-font: Menlo, Consolas, monospace;
    --font-weight: 300;
}
[data-theme="dark"] {
    --fore-color: #e6e6e6;
    --back-color: #1a1a1a;
    --primary-fore-color: #dcebfb;
    --primary-back-color: #162c46;
    --primary-border-color: #2c4c74;
    --primary-hover-color: #1f3a5a;
    --secondary-fore-color: #b0b0b0;
    --secondary-back-color: #252525;
    --secondary-border-color: #333333;
    --secondary-hover-color: #333333;
    --secondary-disabled-color: #444444;
    --action-fore-color: #fddddd;
    --action-back-color: #4a1818;
    --action-border-color: #752e2e;
    --blockquote-color: #666;
    --pre-color: #1565c0;
    --pre-back-color: #333;
    --border-color: #404040;
    --logo-color: #5c9cd6;
    --accent-color: #888;
    /* --a-link-color: #8ab4f8; */
    --a-link-color: #888;
    /* --a-visited-color: #b8a6d9; */
    --a-visited-color: #888;
    --a-hover-back: #555;
    --a-hover-color: #fff;
    --tag-fore-color: #e6e6e6;
    --tag-back-color: #333;
}

html {
    font-size: 16px;
}

a,
b,
del,
em,
i,
ins,
q,
span,
strong,
u {
    font-size: 1em;
}

html,
* {
    font-family: var(--system-font);
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
}

* {
    font-size: 1rem;
}

body {
    margin: 0;
    color: var(--fore-color);
    background: var(--back-color);
    line-height: 1;
    transition: color 0.2s ease;
}

details {
    display: block;
}

summary {
    display: list-item;
}

abbr[title] {
    border-bottom: none;
    text-decoration: underline dotted;
}

input {
    overflow: visible;
}

img {
    max-width: 100%;
    height: auto;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    /*margin: calc(1.5 * var(--universal-margin)) var(--universal-margin);*/
    font-weight: 500;
    /*margin-top: 2rem;*/
}

h1 small,
h2 small,
h3 small,
h4 small,
h5 small,
h6 small {
    color: var(--secondary-fore-color);
    display: block;
    margin-top: -0.25rem;
}

h1 {
    font-size: calc(
        1rem * var(--heading-ratio) * var(--heading-ratio) *
            var(--heading-ratio) * var(--heading-ratio)
    );
}

h2 {
    font-size: calc(
        1rem * var(--heading-ratio) * var(--heading-ratio) *
            var(--heading-ratio)
    );
}

h3 {
    font-size: calc(1rem * var(--heading-ratio) * var(--heading-ratio));
}

h4 {
    font-size: calc(1rem * var(--heading-ratio));
}

h5 {
    font-size: 1rem;
}

h6 {
    font-size: calc(1rem / var(--heading-ratio));
}

p {
    margin: var(--universal-margin);
}

ol,
ul {
    margin: var(--universal-margin);
    padding-left: calc(2 * var(--universal-margin));
}

b,
strong {
    font-weight: 700;
}

hr {
    box-sizing: content-box;
    border: 0;
    line-height: 1.25em;
    margin: var(--universal-margin);
    height: 0.0625rem;
    background: linear-gradient(
        to right,
        transparent,
        var(--border-color) 20%,
        var(--border-color) 80%,
        transparent
    );
}

blockquote {
    display: block;
    position: relative;
    font-style: italic;
    color: var(--secondary-fore-color);
    margin: var(--universal-margin);
    padding: calc(3 * var(--universal-padding));
    border: 0.0625rem solid var(--blockquote-color);
    border: 0;
    border-left: 0.375rem solid var(--blockquote-color);
    border-radius: 0 var(--universal-border-radius)
        var(--universal-border-radius) 0;
    background-color: var(--secondary-back-color);
}

blockquote:before {
    position: absolute;
    top: calc(0rem - var(--universal-padding));
    left: 0;
    font-family: sans-serif;
    font-size: 3rem;
    font-weight: 700;
    content: "\201c";
    color: var(--blockquote-color);
}

blockquote[cite]:after {
    font-style: normal;
    font-size: 0.75em;
    font-weight: 700;
    content: "\a—  " attr(cite);
    white-space: pre;
}

code,
kbd,
pre,
samp {
    font-family: var(--code-font);
    font-size: 12px;
}

code {
    background: var(--secondary-back-color);
    border-radius: var(--universal-border-radius);
    padding: calc(var(--universal-padding) / 4)
        calc(var(--universal-padding) / 2);
}

kbd {
    background: var(--fore-color);
    color: var(--back-color);
    border-radius: var(--universal-border-radius);
    padding: calc(var(--universal-padding) / 4)
        calc(var(--universal-padding) / 2);
}

pre {
    overflow: auto;
    overflow-wrap: break-word;
    padding: calc(1.5 * var(--universal-padding));
    margin: var(--universal-margin);
    border-left: 0.35rem solid var(--pre-color);
    border-radius: 0 var(--universal-border-radius)
        var(--universal-border-radius) 0;
}

sup,
sub,
code,
kbd {
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}

small,
sup,
sub,
figcaption {
    font-size: 0.75em;
}

sup {
    top: -0.5em;
}

sub {
    bottom: -0.25em;
}

figure {
    margin: var(--universal-margin);
}

figcaption {
    color: var(--secondary-fore-color);
}

a {
    text-decoration: none;
    padding: 1px;
}

a:link {
    color: var(--a-link-color);
    text-decoration: underline;
    text-decoration-color: #bbb;
    text-underline-offset: 4px;
    transition: all 0.2s;
}

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

a:hover,
a:focus {
    color: var(--a-hover-color);
    background-color: var(--a-hover-back);
    text-decoration-color: #000;
    /* text-decoration: underline; */
}

/*
  Definitions for the grid system, cards and containers.
*/
.container {
    margin: 0 auto;
    padding: 0 calc(1.5 * var(--universal-padding));
}

.row {
    box-sizing: border-box;
    display: flex;
    flex: 0 1 auto;
    flex-flow: row wrap;
}

@media screen and (min-width: 768px) {
    .col-md,
    [class^="col-md-"],
    [class^="col-md-offset-"],
    .row[class*="cols-md-"] > * {
        box-sizing: border-box;
        flex: 0 0 auto;
        padding: 0 calc(var(--universal-padding) / 2);
    }
    .col-md,
    .row.cols-md > * {
        max-width: 100%;
        flex-grow: 1;
        flex-basis: 0;
    }
    .col-md-1,
    .row.cols-md-1 > * {
        max-width: 8.33333%;
        flex-basis: 8.33333%;
    }
    .col-md-offset-0 {
        margin-left: 0;
    }
    .col-md-2,
    .row.cols-md-2 > * {
        max-width: 16.66667%;
        flex-basis: 16.66667%;
    }
    .col-md-offset-1 {
        margin-left: 8.33333%;
    }
    .col-md-3,
    .row.cols-md-3 > * {
        max-width: 25%;
        flex-basis: 25%;
    }
    .col-md-offset-2 {
        margin-left: 16.66667%;
    }
    .col-md-4,
    .row.cols-md-4 > * {
        max-width: 33.33333%;
        flex-basis: 33.33333%;
    }
    .col-md-offset-3 {
        margin-left: 25%;
    }
    .col-md-5,
    .row.cols-md-5 > * {
        max-width: 41.66667%;
        flex-basis: 41.66667%;
    }
    .col-md-offset-4 {
        margin-left: 33.33333%;
    }
    .col-md-6,
    .row.cols-md-6 > * {
        max-width: 50%;
        flex-basis: 50%;
    }
    .col-md-offset-5 {
        margin-left: 41.66667%;
    }
    .col-md-7,
    .row.cols-md-7 > * {
        max-width: 58.33333%;
        flex-basis: 58.33333%;
    }
    .col-md-offset-6 {
        margin-left: 50%;
    }
    .col-md-8,
    .row.cols-md-8 > * {
        max-width: 66.66667%;
        flex-basis: 66.66667%;
    }
    .col-md-offset-7 {
        margin-left: 58.33333%;
    }
    .col-md-9,
    .row.cols-md-9 > * {
        max-width: 75%;
        flex-basis: 75%;
    }
    .col-md-offset-8 {
        margin-left: 66.66667%;
    }
    .col-md-10,
    .row.cols-md-10 > * {
        max-width: 83.33333%;
        flex-basis: 83.33333%;
    }
    .col-md-offset-9 {
        margin-left: 75%;
    }
    .col-md-11,
    .row.cols-md-11 > * {
        max-width: 91.66667%;
        flex-basis: 91.66667%;
    }
    .col-md-offset-10 {
        margin-left: 83.33333%;
    }
    .col-md-12,
    .row.cols-md-12 > * {
        max-width: 100%;
        flex-basis: 100%;
    }
    .col-md-offset-11 {
        margin-left: 91.66667%;
    }
    .col-md-normal {
        order: initial;
    }
    .col-md-first {
        order: -999;
    }
    .col-md-last {
        order: 999;
    }
}

/* personalization */
body {
    font-weight: var(--font-weight);
}
hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 60px;
}
a {
    color: var(--a-link-color);
}
a:visited {
    color: var(--a-visited-color);
}
p {
    margin-top: 2rem;
}
pre {
    font-family: var(--pre-font);
    font-size: 12px;
    line-height: 1.4;
    white-space: pre-wrap; /* Breaks at word boundaries */
    overflow-wrap: break-word; /* Modern fallback */
    background-color: var(--secondary-back-color);
}
img {
    padding: 0;
    margin: 10px auto;
    width: 100%;
}
blockquote {
    margin: 0 10px;
    padding: 0.1rem 1rem;
}
input.ask {
    padding: 6px 16px;
    margin: 6px auto;
    font-size: 14px;
    color: var(--fore-color);
    background-color: var(--back-color);
    border: 1px solid var(--secondary-border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 400px;
}
input.btn {
    padding: 6px 16px;
    margin-left: 16px;
    font-size: 14px;
    background-color: var(--back-color);
    color: var(--fore-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}
input.primary {
    background-color: var(--primary-back-color);
    color: var(--primary-fore-color);
    border-color: var(--primary-border-color);
    max-width: 77px;
}
input.primary:hover {
    background-color: var(--primary-hover-color);
}
input.secondary {
    background-color: var(--secondary-back-color);
    color: var(--secondary-fore-color);
    max-width: 77px;
}
input.secondary:hover {
    background-color: var(--secondary-hover-color);
}
em {
    font-family: "Times New Roman", Times, serif;
    font-weight: 400px;
}
span.br {
    color: #f00;
}
.logo-small span.br {
    color: var(--border-color);
}
.container {
    margin: 10px auto;
    max-width: 963px;
}
.header {
    margin-top: 40px;
    padding: 0px 0 10px;
    border-bottom: 1px solid var(--border-color);
}
.contents {
    margin: 50px auto;
    font-weight: 400;
}
.section {
    margin-bottom: 60px;
}
.logo {
    margin: 20px 0;
}
.logo a {
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Oxygen,
        Ubuntu,
        Cantarell,
        "Open Sans",
        "Helvetica Neue",
        sans-serif;
    font-size: 19px;
    font-weight: bold;
    text-decoration: none;
    color: var(--logo-color);
}
.logo a:visited {
    color: var(--logo-color);
}
.logo a:hover,
.logo a:focus {
    background-color: transparent;
}
.logo-small a {
    font-size: 14px;
    font-weight: normal;
    text-decoration: none;
    color: var(--border-color);
}
#themeSelect {
    float: right;
    margin: 0 auto;
    padding: 5px;
    font-size: 12px;
    font-weight: light;
    border-radius: 15px;
    color: var(--secondary-fore-color);
    background-color: var(--secondary-back-color);
    border-color: var(--secondary-border-color);
}
.menu a {
    font-weight: 500;
}
.menu a,
.menu-admin a {
    text-decoration: none;
    margin: 0 6px;
}
.search form {
    margin: 20px auto;
}
.search-filter {
    margin-left: 4px;
}
.search a {
    text-decoration: none;
    margin: 0;
}
.tagline {
    margin: 6px 0;
}
.footer {
    margin-top: 30px;
    padding: 10px 0;
    font-size: small;
    border-top: 1px solid var(--border-color);
}
.footer a {
    font-size: small;
    text-decoration: none;
    font-weight: 200;
}
.copyright {
    font-size: small;
    margin-top: 4px;
}
.thumbnail {
    max-width: 100px;
    margin: 10px;
    border: 2px solid var(--border-color);
}
.right {
    float: right;
}
.clear {
    clear: both;
}
.tag,
.author {
    padding: 1px 4px;
    border-radius: 10px;
    background-color: var();
    background-color: var(--tag-back-color);
}
a.tag,
a.author {
    text-decoration: none;
    color: var(--tag-fore-color);
    font-family: "Courier New", Courier, monospace;
    font-size: 14px;
}
.pagination {
    text-align: center;
    color: var(--a-hover-color);
    margin-top: 40px;
}
.pagination a {
    text-decoration: none;
    margin: 1px;
    background-color: var(--secondary-back-color);
    color: var(--secondary-fore-color);
    border-color: var(--secondary-border-color);
    padding: 4px 8px;
    border-radius: 4px;
}
.pagination a:hover {
    background-color: var(--primary-hover-color);
}
.pagination a.active {
    background-color: var(--action-back-color);
    color: var(--action-fore-color);
    border: var(--action-border-color);
}
.pagination a.disabled {
    background-color: var(--secondary-back-color);
    color: var(--secondary-disabled-color);
}
.pages-info {
    margin-top: 1rem;
    text-align: center;
    font-size: small;
    color: var(--secondary-fore-color);
}
.alert {
    margin: 1rem;
    padding: 1rem;
    border-radius: 0.4rem;
    border:1px solid #ccc;
}

.alert-primary {
    border-color: var(--primary-border-color);
}