/*********************************************
 * GLOBAL STYLES
 *********************************************/
/* Import shared stylesheets */
@import url('colors.css');
@import url('fonts.css');


/*********************************************
 * REVEAL.js
 *********************************************/

.reveal-viewport {
  background: #191919;
  background-color: var(--fs-background-color);
}

.reveal {
  font-family: var(--fs-main-font);
  font-size: var(--fs-main-font-size);
  font-weight: normal;
  color: var(--fs-text-color);
}

.reveal ::selection {
  color: var(--fs-selection-color);
  background: var(--fs-selection-background-color);
  text-shadow: none;
}

.reveal ::-moz-selection {
  color: var(--fs-selection-color);
  background: var(--fs-selection-background-color);
  text-shadow: none;
}

.reveal .slides section,
.reveal .slides section > section {
  text-align: left;
  line-height: 1.3;
}

/*********************************************
 * Font
 *********************************************/

.reveal strong,
.reveal b {
  font-weight: bold;
}

.reveal em {
  font-style: italic;
}

.reveal dt {
  font-weight: bold;
}

.reveal .small {
  font-size: 0.85em;
}

/*********************************************
 * HEADERS
 *********************************************/
.reveal h1,
.reveal h2,
.reveal h3,
.reveal h4,
.reveal h5,
.reveal h6 {
  color: var(--fs-heading-color);
  font-family: var(--fs-heading-font);
  text-transform: none;
  word-wrap: break-word;
  text-align: left;
}

.reveal h1 {
  text-align: center;
  line-height: 1.7em;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 2em;
  margin-block: 20% 10%;
}

.reveal h2 {
  margin: 4px 0 50px 0;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.reveal h3 {
  font-weight: 600;
}

/*********************************************
* LISTS
*********************************************/

.reveal ul,
.reveal ol {
  padding-left: 2em;
  margin: 0;
}

.reveal li {
  margin: 0.5em 0;
}

/*********************************************
 * OTHER
 *********************************************/

/* Remove trailing margins after titles */
.reveal h1:last-child,
.reveal h2:last-child,
.reveal h3:last-child,
.reveal h4:last-child,
.reveal h5:last-child,
.reveal h6:last-child {
  margin-bottom: 0;
}

/* Ensure certain elements are never larger than the slide itself */
.reveal img,
.reveal video,
.reveal iframe {
  max-width: 95%;
  max-height: 95%;
}

/*********************************************
 * LINKS
 *********************************************/
.reveal a {
  color: var(--fs-link-color);
  text-decoration: none;
  transition: color 0.15s ease;
}

.reveal a:hover {
  color: var(--fs-link-color-hover);
  text-shadow: 0 0 10px var(--fs-shadow-color);
  border: none;
}

/*********************************************
 * NAVIGATION CONTROLS
 *********************************************/

.reveal .controls {
  display: none !important;
}

/*********************************************
 * PROGRESS BAR
 *********************************************/
.reveal .progress {
  color: var(--fs-navigation-color);
  height: 8px;
}

/*********************************************
 * PRINT BACKGROUND
 *********************************************/
@media print {
  .backgrounds {
    background-color: var(--fs-background-color);
  }

  body {
      counter-reset: page-counter;
  }
  
  .pdf-page {
      counter-increment: page-counter;
      page-break-after: always;
  }

  .pdf-page::before {
      content: counter(page-counter);
      position: absolute;
      left: 47.5%;
      bottom: 39px;
      color: var(--fs-text-subtle-color);
      font-weight: 400;
      width: 40px;
      text-align: right;
      white-space: nowrap;
      font-size: 30px;
      font-size: 0.65em;
      letter-spacing: -0.02em;
      z-index: 1000;
  }

  .pdf-page::after {
      content: url('../assets/images/TULogo_50px.png');
      position: fixed;
      z-index: 1000;
      right: 0;
      top: -10px;
      height: 50px;
      display: flex;
      align-items: center;
      padding: 15px;
      background: var(--fs-header-bg);
      border-radius: 4px;
      margin-right: 20px;
      border: 1px solid var(--fs-border-light);
      box-shadow: 0px 0px 5px 0px var(--fs-shadow-color-light);
  }

  .slide-footer {
    position: fixed !important;
    height: 80px !important;
    background: transparent !important;
    backdrop-filter: none !important;
  }

  .footer-content {
    font-size: 30px !important;
    padding: 0 24px 30px 24px !important;
  }

  .footer-left,
  .footer-right {
    gap: 18px !important;
  }

  .slide-counter {
    margin: 0 18px !important;
  }

  .slide-header,
  .header-logo-box {
    position: fixed !important;
    top: -10px !important;
    padding: 15px !important;
    background: transparent !important;
    backdrop-filter: none !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 4px !important;
    margin-right: 20px !important;
  }

  .header-logo {
    height: 50px !important;
  }
}

/*********************************************
 * SLIDE HEADER AND FOOTER
 *********************************************/

.header-logo-box {
  position: absolute;
  z-index: 1001;
  cursor: pointer;
  right: 0;
  top: -0.5vw;
  display: flex;
  align-items: center;
  padding: min(0.8vw, 1.4vh);
  background: var(--fs-header-bg);
  backdrop-filter: blur(0.26vw);
  border-radius: 0.2vw;
  margin-right: min(2vw, 3vh);
  border: 1px solid var(--fs-border-light);
  box-shadow: 0 0px 1vw var(--fs-shadow-color-light);
}

.header-logo {
  height: min(2.6vw, 4.65vh);
  width: auto;
  object-fit: contain;
  opacity: 0.8;
}

.slide-footer {
    position: fixed;
    bottom: 0px;
    left: 0;
    width: 100%;
    height: min(4.2vw, 6.5vh);
    background: transparent;
    backdrop-filter: blur(0.5vw);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    width: 100%;
    padding: 0 1.5vw 1.9vw 1.5vw;
    font-size:  min(1.4vw, 2.5vh);
    letter-spacing: -0.02em;
}

.footer-left {
    color: var(--fs-text-muted-color);
    font-weight: 500;
    text-align: left;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.9vw;
}

.footer-left::after {
    content: '';
    height: 1px;
    background: linear-gradient(to right, transparent, var(--fs-text-muted-color), transparent);
    opacity: 0.6;
    flex: 1;
    margin-left: auto;
}

.slide-counter {
    color: var(--fs-text-subtle-color);
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    margin: 0 0.9vw;
    grid-column: 2;
}

.footer-right {
    color: var(--fs-text-muted-color);
    font-weight: 500;
    text-align: right;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.9vw;
}

.footer-right::before {
    content: '';
    height: 1px;
    background: linear-gradient(to right, transparent, var(--fs-text-muted-color), transparent);
    opacity: 0.6;
    flex: 1;
    margin-right: auto;
}


/* Hide header and footer for specific slides */
.no-header .slide-header,
.no-footer .slide-footer,
.no-chrome .slide-header,
.no-chrome .slide-footer {
  display: none;
}

/*********************************************
 * Highlighted Elements
 *********************************************/

 /* Highlighted emphasis */
.highlight {
  background: var(--fs-highlight-background) !important;
  color: var(--fs-highlight-color) !important;
  padding: 35px;
  border-radius: 0.2em;
  margin: 1em 0 1em 0;
  font-weight: bold;
  text-align: center;
  box-shadow: 0 0 20px var(--fs-shadow-color);
}

.highlight a {
  color: var(--fs-link-color-light);
}

.tiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  padding: 20px 0;
}

.tile {
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-radius: 16px;
  padding: 40px 30px;
  box-shadow: 0 0px 20px var(--fs-shadow-color-light);
}

.tile h3 {
  font-size: 0.9em;
  color: var(--fs-text-color);
  margin-top: 5px;
  margin-bottom: 20px;
  font-weight: 600;
  text-align: center;
}

.tile-description {
  color: var(--fs-text-muted-color);
  height: auto;
  font-size: 0.65em;
  line-height: 1.6;
  margin-bottom: 20px;
}

.tile-applications {
  color: var(--fs-text-subtle-color);
  font-size: 0.65em;
  font-style: italic;
  padding-top: 15px;
  border-top: 1px solid var(--fs-border);
}

.applications-label {
  font-weight: 600;
  color: var(--fs-text-muted-color);
  margin-bottom: 5px;
}

.tile.color-0 {
  background: var(--fs-fragment-select-light);
}

.tile.color-1 {
  background: var(--fs-link-color-light);
}

.tile.color-2 {
  background: var(--fs-shadow-color-light);
  color: var(--fs-highlight-color);
}

/*********************************************
 * FRAGMENTS
 *********************************************/

.fragment.select.visible {
  background-color: var(--fs-fragment-select-color);
}

.fragment.select.visible.tile-description {
  background: none;
}

.fragment.select.visible.timeline-dot {
  background: var(--fs-fragment-select-color);
  border-color: var(--fs-background-color);
  box-shadow: 0 0 10px var(--fs-fragment-select-color);
}

.fragment.select.visible.timeline-item {
  background: none;
}

.fragment.select.visible.timeline-item .timeline-year {
  color: var(--fs-fragment-select-color);
  transition: color 1s;
}

.fragment.select:not(.current-fragment).visible {
  background: none;
}

.fragment.select:not(.current-fragment).visible.timeline-dot {
  background: var(--fs-background-color);
  border-color: var(--fs-link-color);
  box-shadow: none;
}

.fragment.select:not(.current-fragment).visible.timeline-item .timeline-year {
  color: var(--fs-link-color);
  font-size: 0.6em;
}

.timeline-purple .fragment.select:not(.current-fragment).visible.timeline-dot {
  background: var(--fs-background-color);
  border-color: var(--fs-highlight-background);
  box-shadow: none;
}

.timeline-purple .fragment.select:not(.current-fragment).visible.timeline-item .timeline-year {
  color: var(--fs-highlight-background);
  font-size: 0.6em;
}


.fragment.appear-table {
  display: none;
}

.fragment.appear-table.visible {
  display: table-row;
}

.fragment.appear-vanish {
  display: none !important;
}

.fragment.appear-vanish.current-fragment {
  display: block !important;
}

.fragment.appear-vanish:not(.current-fragment).visible {
  display: none !important;
}

.fragment.appear-vanish.flex.current-fragment {
  display: flex !important;
}

.fragment.vanish {
  display: block;
}

.fragment.vanish.flex {
  display: flex !important;
}

.fragment.vanish.visible {
  display: none !important;
}

.fragment.vanish.current-fragment {
  display: none !important;
}

.fragment.vanish:not(.current-fragment) {
  display: block !important;
}

.fragment.vanish:not(.current-fragment).flex {
  display: flex !important;
}

.fragment.color-0.visible {
  border-color: var(--fs-fragment-select-light);
  color: var(--fs-fragment-select-light) !important;
}

.fragment.color-1.visible {
  border-color: var(--fs-fragment-select-color-1);
  color: var(--fs-fragment-select-color-1) !important;
}

.fragment.color-2.visible {
  border-color: var(--fs-shadow-color);
  color: var(--fs-shadow-color) !important;
}

.reveal .slides section .fragment.select {
  transition: 2s;
}

/*********************************************
 * CODE BLOCKS AND INLINE CODE
 *********************************************/

/* Inline code */
.reveal code {
  font-family: var(--fs-code-font);
  color: var(--fs-link-color);
  background: var(--fs-surface);
  padding: 0.15em 0.4em;
  border-radius: 0.3em;
  font-size: 0.9em;
  border: 1px solid var(--fs-border-light);
  font-weight: 500;
}

/*********************************************
 * FORMULAS
 *********************************************/

.formula {
  background: var(--fs-surface);
  border: 1px solid var(--fs-border);
  border-left: 4px solid var(--fs-link-color);
  border-radius: 8px;
  padding: 30px 40px;
  margin: 25px auto;
  text-align: center;
  box-shadow: 0 4px 20px var(--fs-shadow-color-light);
  max-width: 90%;
}

.formula .MathJax {
  color: var(--fs-text-color);
  font-size: inherit;
}

/* Alternative formula styles */
.formula.accent-purple {
  border-left-color: var(--fs-highlight-background);
}

.formula.minimal {
  background: transparent;
  border: none;
  border-top: 1px solid var(--fs-border-light);
  border-bottom: 1px solid var(--fs-border-light);
  box-shadow: none;
  padding: 20px 0;
}

.formula.highlight {
  background: var(--fs-highlight-background);
  border-color: var(--fs-highlight-background);
  color: var(--fs-highlight-color);
}

.formula.highlight .MathJax {
  color: var(--fs-highlight-color);
}

/*********************************************
 * CODE BLOCKS
 *********************************************/
.reveal pre {
  display: block;
  position: relative;
  width: 100%;
  margin: 1.5em 0;
  text-align: left;
  font-size: 0.8em;
  line-height: 1.5;
  word-wrap: break-word;
  box-shadow: 0 4px 20px var(--fs-shadow-color-light);
  border-radius: 8px;
  overflow: hidden;
}

.reveal pre code {
  display: block;
  padding: 1.5em;
  overflow: auto;
  max-height: 600px;
  word-wrap: normal;
  background: var(--fs-surface);
  color: var(--fs-text-color);
  border: 1px solid var(--fs-border);
  border-radius: 8px;
  font-weight: 400;
}

/* Code block with language label */
.reveal pre[class*="language-"]::before {
  content: attr(data-language);
  position: absolute;
  top: 0;
  right: 0;
  padding: 0.3em 0.8em;
  font-size: 0.75em;
  font-family: var(--fs-heading-font);
  background: var(--fs-surface-alt);
  color: var(--fs-text-muted-color);
  border-bottom-left-radius: 0.5em;
  border-top-right-radius: 0.5em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  z-index: 1;
}

/* Syntax highlighting colors using your theme */
.reveal pre code .hljs-keyword,
.reveal pre code .hljs-built_in {
  color: var(--fs-link-color-hover);
  font-weight: 600;
}

.reveal pre code .hljs-string {
  color: var(--fs-fragment-select-color-1);
}

.reveal pre code .hljs-comment,
.reveal pre code .hljs-doctag {
  color: var(--fs-text-subtle-color);
  font-style: italic;
}

.reveal pre code .hljs-function,
.reveal pre code .hljs-title {
  color: var(--fs-link-color);
  font-weight: 500;
}

.reveal pre code .hljs-number,
.reveal pre code .hljs-literal {
  color: var(--fs-highlight-background);
}

.reveal pre code .hljs-operator,
.reveal pre code .hljs-punctuation {
  color: var(--fs-text-muted-color);
}

.reveal pre code .hljs-class .hljs-title,
.reveal pre code .hljs-type {
  color: var(--fs-link-color-light);
  font-weight: 600;
}

.reveal pre code .hljs-variable,
.reveal pre code .hljs-params {
  color: var(--fs-text-color);
}

.reveal pre code .number {
  color: var(--fs-highlight-background);
}

.reveal pre code .operator {
  color: var(--fs-text-muted-color);
}

.reveal pre code .class-name {
  color: var(--fs-link-color-light);
  font-weight: 600;
}

.reveal pre code .variable {
  color: var(--fs-text-color);
}

/* Line highlighting in code blocks */
.reveal pre code .highlight-line {
  background: var(--fs-selection-background-color);
  display: block;
  margin: 0 -1.5em;
  padding: 0 1.5em;
  border-left: 3px solid var(--fs-highlight-background);
}

/* Alternative code block style - accent border */
.reveal pre.accent {
  border-left: 4px solid var(--fs-link-color);
}

.reveal pre.accent-purple {
  border-left: 4px solid var(--fs-highlight-background);
}

/* Dark code blocks for light theme / light for dark theme */
[data-theme="light"] .reveal pre code {
  background: rgba(36, 37, 41, 0.05);
  border-color: var(--fs-border);
}

[data-theme="dark"] .reveal pre code {
  background: rgba(250, 250, 250, 0.03);
  border-color: var(--fs-border);
}

/* Scrollbar styling for code blocks */
.reveal pre code::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}

.reveal pre code::-webkit-scrollbar-track {
  background: var(--fs-surface);
  border-radius: 4px;
}

.reveal pre code::-webkit-scrollbar-thumb {
  background: var(--fs-border);
  border-radius: 4px;
}

.reveal pre code::-webkit-scrollbar-thumb:hover {
  background: var(--fs-text-subtle-color);
}

/*********************************************
 * TABLES
 *********************************************/

.reveal table {
  margin: 1.5em auto;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--fs-surface);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--fs-shadow-color-light);
  border: 1px solid var(--fs-border);
  font-family: var(--fs-main-font);
  font-size: 1.1em;
  max-width: 95%;
}

.reveal table th {
  background: var(--fs-surface-alt, var(--fs-surface));
  color: var(--fs-heading-color);
  font-family: var(--fs-heading-font);
  font-weight: 600;
  font-size: 1.0em;
  letter-spacing: 0.02em;
  text-align: left;
  padding: 12px 20px;
  border-bottom: 2px solid var(--fs-border);
  position: relative;
}

.reveal table th:first-child {
  border-top-left-radius: 6px;
}

.reveal table th:last-child {
  border-top-right-radius: 6px;
}

.reveal table td {
  color: var(--fs-text-color);
  padding: 10px 20px;
  border-bottom: 1px solid var(--fs-border-light);
  vertical-align: top;
  line-height: 1.4;
}

.reveal table td.date {
  width: 80px;
}

.reveal .highlight td {
  text-align: left !important;
}

.reveal table tr:last-child td {
  border-bottom: none;
}

.reveal table tr:last-child td:first-child {
  border-bottom-left-radius: 6px;
}

.reveal table tr:last-child td:last-child {
  border-bottom-right-radius: 6px;
}

.reveal table tr:hover {
  background: var(--fs-surface-alt, var(--fs-selection-background-color));
}

.reveal table tr:hover td {
  color: var(--fs-text-color);
}

.reveal table th:not(:last-child),
.reveal table td:not(:last-child) {
  border-right: 1px solid var(--fs-border-light);
}

.reveal table code {
  background: var(--fs-surface-alt, var(--fs-selection-background-color));
  color: var(--fs-text-color);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: var(--fs-code-font);
}

.reveal table strong {
  color: var(--fs-heading-color);
  font-weight: 600;
}

.reveal table em {
  color: var(--fs-text-muted-color);
  font-style: italic;
}

/*********************************************
 * PICTURES LIGHT/DARK
 *********************************************/

[data-theme="light"] {
  .picture-light {
    display: block;
  }
  .picture-dark {
    display: none;
  }
}

[data-theme="dark"] {
  .picture-light {
    display: none;
  }

  .picture-dark {
    display: block;
  }
}

/*********************************************
 * REFERENCES
 *********************************************/

.reference {
  position: relative;
  bottom: -20px; /* Above the footer which is 80px high */
  width: 100%;
  font-size: 0.5em;
  color: var(--fs-text-subtle-color);
  font-family: var(--fs-main-font);
  font-weight: 400;
  pointer-events: none; /* Allow clicks to pass through */
}

.reference a {
  color: var(--fs-link-color);
  text-decoration: none;
  transition: color 0.15s ease;
  pointer-events: auto; /* Re-enable clicks for links */
  cursor: pointer;
}

.reference a:hover {
  color: var(--fs-link-color-hover);
  text-decoration: underline;
}

.reference em {
  font-style: italic;
  color: var(--fs-text-muted-color);
}

/*********************************************
 * IMAGE OVERLAY
 *********************************************/

.image-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: var(--fs-overlay);
  border: 2px solid var(--fs-border);
  border-radius: 10px;
  padding: 60px;
  box-shadow: 0 4px 8px var(--fs-shadow-color);
  color: var(--fs-text-color);
  z-index: 10;
}


/***********************************************
 * TIMELINE
 *********************************************/

 .timeline-container {
    background: var(--fs-surface);
    border: 1px solid var(--fs-border);
    border-radius: 12px;
    padding: 30px 25px;
    margin: 20px 0;
    box-shadow: 0 4px 20px var(--fs-shadow-color-light);
    display: flex;
}

.timeline-title {
    color: var(--fs-heading-color);
    font-family: var(--fs-heading-font);
    font-weight: 600;
    font-size: 0.8em;
    margin-bottom: 10px;
    text-align: center;
}

.timeline-text {
    color: var(--fs-text-muted-color);
    font-size: 0.5em;
    line-height: 1.4;
    text-align: left;
}

.timeline {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-left: 15px;
    margin-right: 15px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 0px;
    right: 0px;
    height: 3px;
    background: var(--fs-link-color);
    z-index: 1;
}

.timeline-dot {
    width: 1.4%;
    aspect-ratio: 1 / 1;
    background: var(--fs-background-color);
    border: 3px solid var(--fs-link-color);
    border-radius: 50%;
    margin-bottom: 12px;
    position: absolute;
    transform: translateX(-50%);
    top: -8px;
    z-index: 3;
    pointer-events: auto;
    left: calc((var(--year) - var(--start-year)) / (var(--end-year) - var(--start-year)) * (100% - 1.4%) + 0.7%);
    top: 0px;
}

.timeline-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 2;
    flex: 1;
    margin-top: 40px;
}

.timeline-content {
    text-align: center;
    margin: 0 10px;
}

.timeline-year {
    font-size: 0.6em;
    font-weight: bold;
    color: var(--fs-link-color);
    margin-bottom: 2px;
}

.timeline-name {
    font-size: 0.5em;
    font-weight: 600;
    color: var(--fs-heading-color);
}

.timeline-author {
    font-size: 0.4em;
    color: var(--fs-text-muted-color);
}

.timeline-connector {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.timeline-connector svg {
  position: absolute;
}

.timeline-connector line {
  position: relative;
  stroke: var(--fs-shadow-color);
  stroke-width: 2px;
}

.timeline-purple .timeline-dot {
  border-color: var(--fs-highlight-background);
}

.timeline-purple.timeline::before {
  background: var(--fs-highlight-background);
}

.timeline-purple .timeline-year {
  color: var(--fs-highlight-background);
}

.timeline-secondary .timeline-year {
    font-size: 0.5em;
    font-weight: 600;
    margin-bottom: 0px;
    line-height: 1em;
}

.timeline-secondary .timeline-name {
    font-size: 0.4em;
    font-weight: 400;
}