* {
    box-sizing: var(--reset-box-sizing);
    margin: var(--reset-margin);
    padding: var(--reset-padding);
}

body {
    background-color: var(--background-color);
    color: var(--font-color);
    font-family: var(--basic-font-family);
    font-size: var(--basic-font-size);
    width: 100%;
    padding: var(--body-padding);
    text-rendering: optimizeLegibility;
}

a {
    color: var(--link-color);
    text-shadow:
        1px 1px 2px var(--link-glow-color),
        1px 1px 2px var(--link-glow-color);
    text-decoration: none;
}

a.internal-link {
    color: var(--page-internal-link-color);
    text-shadow:
        1px 1px 2px var(--page-internal-link-glow-color),
        1px 1px 2px var(--page-internal-link-glow-color);
    text-decoration: none;
}
a.internal-link:hover {
    color: var(--page-internal-link-hover-color);
    text-shadow:
        2px 2px 4px var(--page-internal-link-hover-glow-color),
        2px 2px 4px var(--page-internal-link-hover-glow-color);
    text-decoration: none;
}

a.external-link {
    color: var(--page-external-link-color);
    text-shadow:
        1px 1px 2px var(--page-external-link-glow-color),
        1px 1px 2px var(--page-external-link-glow-color);
    text-decoration: none;
}
a.external-link:hover {
    color: var(--page-external-link-hover-color);
    text-shadow:
        2px 2px 4px var(--page-external-link-hover-glow-color),
        2px 2px 4px var(--page-external-link-hover-glow-color);
    text-decoration: none;
}

a:hover {
    color: var(--link-color-hover);
    text-shadow:
        2px 2px 4px var(--link-glow-color-hover),
        2px 2px 4px var(--link-glow-color-hover);
    text-decoration: none;
}

code {
    padding: 0.1em 0.15em 0.1em;
    color: var(--code-font-color);
    background-color: var(--code-background-color);
    font-family: monospace;
    border-radius: 7px;
    font-size: var(--code-font-size);
}

hr {
    border: 0;
    height: 3px;
    background-image: linear-gradient(
        to right,
        var(--horizontal-rule-gradient-left-color),
        var(--horizontal-rule-gradient-center-color),
        var(--horizontal-rule-gradient-right-color)
    );
    margin: 1rem 0 1rem 0;
    padding: 0 2rem 0 2rem;
}

.main-content {}
.main-content h1 {
    margin: auto;
    font-size: var(--heading-1-font-size);
    text-align: center;
}
.main-content h1 ~ * {
    margin-top: var(--heading-1-margin-to-sibling);
}
.main-content h2 {
    font-size: var(--heading-2-font-size);
    /* text-align: left; */
    margin-top: var(--heading-2-margin-bottom);
}

.content-section > *:last-child {
    margin-bottom: var(--content-section-last-element-margin-bottom);
}
.content-section h1 .link-symbol {
    visibility: hidden;
}
.content-section h1:hover .link-symbol {
    visibility: visible;
}
.content-section h2 {
    text-align: center;
    margin: auto;
    display: block;
}
.content-section h2 .link-symbol {
    visibility: hidden;
}
.content-section h2:hover .link-symbol {
    visibility: visible;
}

.link-symbol a {
    color: var(--heading-link-symbol-color);
    text-decoration: none;
    cursor: pointer;
}
.link-symbol a:hover {
    color: var(--heading-link-symbol-hover-color);
    text-shadow:
        2px 2px 4px var(--heading-link-symbol-hover-glow-color),
        2px 2px 4px var(--heading-link-symbol-hover-glow-color);
    text-decoration: none;
    cursor: pointer;
}


.content-section p {
  margin-bottom: var(--content-paragraphs-margin-bottom);
}

/***************/
/* BREADCRUMBS */
/***************/
.content-section:hover .breadcrumbs {
    /* visibility: visible; */
    display: block;
}
.content-section .breadcrumbs {
    /* visibility: hidden; */
    display: block;             /*none*/
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}
.content-section .breadcrumbs a {
    color: var(--breadcrumbs-color);
    font-size: var(--breadcrumbs-font-size);
}
.content-section .breadcrumbs a:hover {
    color: var(--breadcrumbs-hover-color);
    text-shadow:
        2px 2px 4px var(--breadcrumbs-hover-glow-color),
        2px 2px 4px var(--breadcrumbs-hover-glow-color);
    text-decoration: none;
}


/*********/
/* LISTS */
/*********/
ul {
    list-style-type: disc;
    list-style-position: outside;
    margin-block-start: 0.5rem;
    margin-block-end: 0.5rem;
    padding-inline-start: var(--list-indent);
}

.content-section ul {
    font-size: var(--basic-font-size);
}

.content-section ul li:hover {
    list-style-type: square;
}
.content-section ul ul {
    list-style-type: circle;

    font-size: 0.8em;
}


.content-section .project-tiles {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: stretch;
    align-content: flex-start;
    gap: 1rem;
}
.content-section .project-tiles > * {
    overflow: auto;

    flex-grow: 1;
    align-self: flex-start;
    flex-basis: 30vw;
    min-width: min(30rem, 100%);

    border: 1px solid var(--project-tiles-border-color);
    border-bottom: 4px dotted rgba(255, 255, 255, 0.4);

    padding: 1rem;
}

/* using flex with orientation column to make the heading "fixed" */
.project {
    display: flex;
    flex-direction: column;
}
.project .project-header {
    flex: none;
}
.project .project-content {
    flex: auto;
    max-height: 60vh;
    overflow-y: auto;
}

/* back to top fixed button */

.back-to-top-nav {
    font-size: calc(0.6rem + 1vmin);
    line-height: calc(0.6rem + 1vmin);
    vertical-align: middle;
    text-align: center;
    padding: 0.2rem;

    position: fixed;
    right: calc(0.5em + 1vw);
    bottom: calc(0.5em + 1vh);

    /* width: 3rem; */
    height: calc(1rem + 1vmin);

    border-radius: 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.4);

    background-color: var(--background-color);
}

.back-to-top-nav a {
    color: var(--back-to-top-link-symbol-color);
    text-decoration: none;
    cursor: pointer;
}
.back-to-top-nav a:hover {
    color: var(--back-to-top-link-symbol-hover-color);
    text-shadow:
        2px 2px 4px var(--back-to-top-link-symbol-hover-glow-color),
        2px 2px 4px var(--back-to-top-link-symbol-hover-glow-color);
    text-decoration: none;
    cursor: pointer;
}

.text-as-image {
    vertical-align: middle;
    display: inline-block;
}

.text-highlight {
    color: var(--text-highlight-color);
    text-shadow: 1px 1px 1px var(--text-highlight-glow-color);
}

/* em: multiples of parent element font size */
/* rem: multiples of ROOT element font size */


.nav-and-content-wrapper {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: flex-start;
    gap: var(--main-nav-gap);
}

main {
    max-width: var(--main-max-width);
    margin-left: var(--main-nav-gap);
}