/*
 * ============================================================
 *  ACADEMIC THEME for reveal.js
 *  HTML Slides Starter Kit — xkiwilabs.com
 * ============================================================
 *
 *  A clean, professional dark theme for academic presentations.
 *  Derived from a university lecture theme; made generic for
 *  any institution, department, or course.
 *
 *  Works with reveal.js 5.x via CDN — no build step needed.
 *
 * ============================================================
 *
 *  ╔══════════════════════════════════════════════════════════╗
 *  ║  CUSTOMISE THESE — Change the variables below to        ║
 *  ║  match your university or organisation's brand.          ║
 *  ║  These 8 colours control the entire theme.               ║
 *  ╚══════════════════════════════════════════════════════════╝
 */

:root {
  /* === PRIMARY BRAND COLOURS === */
  --theme-primary: #2563EB;        /* Main accent — buttons, links, borders  */
  --theme-primary-dark: #1E40AF;   /* Darker variant — gradients, hover      */
  --theme-accent: #D97706;         /* Secondary accent — highlights, tags     */

  /* === BACKGROUND & TEXT === */
  --theme-charcoal: #2D2D2D;       /* Text on light backgrounds               */
  --theme-dark: #1A1A2E;           /* Darkest background                      */
  --theme-light-text: #F0F0F0;     /* Primary text colour on dark slides      */
  --theme-muted-text: #B0B0C0;     /* Secondary / dimmed text                 */

  /* === SEMANTIC COLOURS === */
  --theme-blue: #4A90D9;
  --theme-green: #5BA55B;
  --theme-orange: #E8873D;
  --theme-purple: #7B68A8;
  --theme-red: #D9534F;
  --theme-gold: #D4A843;

  /* === GRADIENTS === */
  --theme-gradient: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #1E40AF 100%);
  --theme-gradient-dark: linear-gradient(135deg, #0F0F1A 0%, #1A1A2E 100%);

  /* === TYPOGRAPHY === */
  --theme-font-heading: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --theme-font-body: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --theme-font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
}


/* ============================================================
 *  BASE SLIDE STYLES
 * ============================================================ */

.reveal .slides section {
  text-align: left;
  padding: 40px 60px;
  box-sizing: border-box;
  height: 100%;
  font-family: var(--theme-font-body);
  color: var(--theme-light-text);
}

.reveal .slides {
  text-align: left;
}

.reveal {
  font-family: var(--theme-font-body);
  font-size: 32px;
  color: var(--theme-light-text);
}

.reveal .slide-background {
  background: var(--theme-gradient);
}


/* ============================================================
 *  TYPOGRAPHY
 * ============================================================ */

.reveal h1 {
  font-family: var(--theme-font-heading);
  font-size: 2.4em;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.4em;
  line-height: 1.15;
  text-transform: none;
}

.reveal h2 {
  font-family: var(--theme-font-heading);
  font-size: 1.8em;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.5em;
  line-height: 1.2;
  text-transform: none;
  border-bottom: 3px solid var(--theme-primary);
  padding-bottom: 10px;
  display: inline-block;
}

.reveal h3 {
  font-family: var(--theme-font-heading);
  font-size: 1.3em;
  font-weight: 600;
  color: var(--theme-primary);
  margin-bottom: 0.4em;
  text-transform: none;
}

.reveal h4 {
  font-family: var(--theme-font-heading);
  font-size: 1.1em;
  font-weight: 600;
  color: var(--theme-muted-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reveal p {
  font-size: 0.85em;
  line-height: 1.7;
  margin-bottom: 0.8em;
  color: var(--theme-light-text);
}

.reveal strong {
  color: #FFFFFF;
  font-weight: 700;
}

.reveal em {
  color: var(--theme-accent);
  font-style: italic;
}


/* ============================================================
 *  LISTS — Triangle bullets (▸)
 * ============================================================ */

.reveal ul {
  list-style: none;
  padding-left: 0;
  margin-left: 0;
}

.reveal ul li {
  padding-left: 1.4em;
  position: relative;
  margin-bottom: 0.5em;
  font-size: 0.85em;
  line-height: 1.6;
}

.reveal ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--theme-primary);
  font-weight: bold;
}

/* Nested bullets */
.reveal ul ul li::before {
  content: '▹';
  color: var(--theme-muted-text);
}

.reveal ol {
  padding-left: 1.4em;
  margin-left: 0;
}

.reveal ol li {
  margin-bottom: 0.5em;
  font-size: 0.85em;
  line-height: 1.6;
}

/* Coloured bullet variants */
.reveal ul.blue-bullets li::before { color: var(--theme-blue); }
.reveal ul.green-bullets li::before { color: var(--theme-green); }
.reveal ul.orange-bullets li::before { color: var(--theme-orange); }
.reveal ul.purple-bullets li::before { color: var(--theme-purple); }
.reveal ul.red-bullets li::before { color: var(--theme-red); }


/* ============================================================
 *  TITLE SLIDE
 * ============================================================ */

.title-slide {
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: var(--theme-gradient) !important;
}

.title-slide h1 {
  font-size: 3em;
  margin-bottom: 0.2em;
  border-bottom: none;
}

.title-slide .subtitle {
  font-size: 1.3em;
  color: var(--theme-primary);
  font-weight: 400;
  margin-bottom: 1.5em;
}

.title-slide .author {
  font-size: 1.1em;
  color: var(--theme-light-text);
  margin-bottom: 0.3em;
}

.title-slide .affiliation {
  font-size: 0.85em;
  color: var(--theme-muted-text);
  margin-bottom: 0.2em;
}

.title-slide .date {
  font-size: 0.8em;
  color: var(--theme-muted-text);
  margin-top: 1em;
}

.title-slide .title-decoration {
  width: 120px;
  height: 4px;
  background: var(--theme-primary);
  margin: 0 auto 1.5em;
  border-radius: 2px;
}


/* ============================================================
 *  SECTION DIVIDER
 * ============================================================ */

.section-divider {
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: var(--theme-gradient-dark) !important;
}

.section-divider h2 {
  font-size: 2.5em;
  border-bottom: none;
  display: block;
  color: #FFFFFF;
}

.section-divider .section-number {
  font-size: 4em;
  font-weight: 800;
  color: var(--theme-primary);
  opacity: 0.3;
  margin-bottom: -0.2em;
}

.section-divider .section-description {
  font-size: 1.1em;
  color: var(--theme-muted-text);
  max-width: 700px;
  margin-top: 0.5em;
}


/* ============================================================
 *  THINK / DISCUSSION SLIDES
 * ============================================================ */

.think-slide {
  background: linear-gradient(135deg, #1A1A2E 0%, #2D1B4E 100%) !important;
}

.think-slide h2 {
  color: var(--theme-purple);
  border-bottom-color: var(--theme-purple);
}

.discussion-slide {
  background: linear-gradient(135deg, #1A1A2E 0%, #1B3A2E 100%) !important;
}

.discussion-slide h2 {
  color: var(--theme-green);
  border-bottom-color: var(--theme-green);
}


/* ============================================================
 *  HIGHLIGHT BOXES
 * ============================================================ */

.highlight-box {
  padding: 24px 30px;
  border-radius: 12px;
  margin-bottom: 20px;
  border-left: 5px solid;
}

.highlight-box h3 {
  margin-top: 0;
  font-size: 1.1em;
  margin-bottom: 0.4em;
}

.highlight-box p {
  margin-bottom: 0;
  font-size: 0.8em;
}

/* Blue box */
.highlight-box.blue,
.highlight-blue {
  background: rgba(74, 144, 217, 0.1);
  border-left-color: var(--theme-blue);
}

.highlight-box.blue h3,
.highlight-blue h3 {
  color: var(--theme-blue);
}

/* Red box */
.highlight-box.red,
.highlight-red {
  background: rgba(217, 83, 79, 0.1);
  border-left-color: var(--theme-red);
}

.highlight-box.red h3,
.highlight-red h3 {
  color: var(--theme-red);
}

/* Gold box */
.highlight-box.gold,
.highlight-gold {
  background: rgba(212, 168, 67, 0.1);
  border-left-color: var(--theme-gold);
}

.highlight-box.gold h3,
.highlight-gold h3 {
  color: var(--theme-gold);
}

/* Green box */
.highlight-box.green,
.highlight-green {
  background: rgba(91, 165, 91, 0.1);
  border-left-color: var(--theme-green);
}

.highlight-box.green h3,
.highlight-green h3 {
  color: var(--theme-green);
}

/* Purple box */
.highlight-box.purple,
.highlight-purple {
  background: rgba(123, 104, 168, 0.1);
  border-left-color: var(--theme-purple);
}

.highlight-box.purple h3,
.highlight-purple h3 {
  color: var(--theme-purple);
}

/* Orange box */
.highlight-box.orange,
.highlight-orange {
  background: rgba(232, 135, 61, 0.1);
  border-left-color: var(--theme-orange);
}

.highlight-box.orange h3,
.highlight-orange h3 {
  color: var(--theme-orange);
}


/* ============================================================
 *  TAGS / BADGES
 * ============================================================ */

.tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.7em;
  font-weight: 600;
  margin-right: 8px;
  margin-bottom: 6px;
}

.tag.blue { background: rgba(74, 144, 217, 0.2); color: var(--theme-blue); }
.tag.green { background: rgba(91, 165, 91, 0.2); color: var(--theme-green); }
.tag.orange { background: rgba(232, 135, 61, 0.2); color: var(--theme-orange); }
.tag.purple { background: rgba(123, 104, 168, 0.2); color: var(--theme-purple); }
.tag.red { background: rgba(217, 83, 79, 0.2); color: var(--theme-red); }
.tag.gold { background: rgba(212, 168, 67, 0.2); color: var(--theme-gold); }


/* ============================================================
 *  LAYOUTS — Two-Column
 * ============================================================ */

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
  margin-top: 20px;
}

.two-column.wide-left {
  grid-template-columns: 2fr 1fr;
}

.two-column.wide-right {
  grid-template-columns: 1fr 2fr;
}

.three-column {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 30px;
  align-items: start;
  margin-top: 20px;
}


/* ============================================================
 *  LAYOUTS — Grid
 * ============================================================ */

.grid-2x2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.grid-2x2 > div {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  padding: 24px;
  border-left: 4px solid var(--theme-primary);
}

.grid-2x2 > div:nth-child(2) {
  border-left-color: var(--theme-green);
}

.grid-2x2 > div:nth-child(3) {
  border-left-color: var(--theme-orange);
}

.grid-2x2 > div:nth-child(4) {
  border-left-color: var(--theme-purple);
}


/* ============================================================
 *  IMAGE SLIDES
 * ============================================================ */

.image-slide .two-column {
  align-items: center;
}

.image-slide img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.reveal section img {
  border: none;
  box-shadow: none;
  max-width: 100%;
}

.reveal section img.rounded {
  border-radius: 12px;
}

.reveal section img.shadow {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}


/* ============================================================
 *  FLOW DIAGRAMS
 * ============================================================ */

.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 30px 0;
  flex-wrap: wrap;
}

.flow-step {
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--theme-primary);
  border-radius: 12px;
  padding: 20px 28px;
  text-align: center;
  min-width: 160px;
}

.flow-step .step-number {
  font-size: 1.6em;
  font-weight: 800;
  color: var(--theme-primary);
  display: block;
  margin-bottom: 6px;
}

.flow-step .step-label {
  font-size: 0.85em;
  color: var(--theme-light-text);
  font-weight: 600;
}

.flow-step .step-desc {
  font-size: 0.7em;
  color: var(--theme-muted-text);
  margin-top: 4px;
}

.flow-arrow {
  font-size: 1.8em;
  color: var(--theme-primary);
  padding: 0 12px;
  opacity: 0.6;
}

/* Colour variants for flow steps */
.flow-step.blue { border-color: var(--theme-blue); }
.flow-step.blue .step-number { color: var(--theme-blue); }

.flow-step.green { border-color: var(--theme-green); }
.flow-step.green .step-number { color: var(--theme-green); }

.flow-step.orange { border-color: var(--theme-orange); }
.flow-step.orange .step-number { color: var(--theme-orange); }

.flow-step.purple { border-color: var(--theme-purple); }
.flow-step.purple .step-number { color: var(--theme-purple); }

.flow-step.red { border-color: var(--theme-red); }
.flow-step.red .step-number { color: var(--theme-red); }


/* ============================================================
 *  TIMELINE
 * ============================================================ */

.timeline {
  position: relative;
  padding-left: 40px;
  margin: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--theme-primary);
  opacity: 0.3;
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 24px;
  padding-left: 20px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--theme-primary);
  border-radius: 50%;
  border: 3px solid var(--theme-dark);
}

.timeline-item .timeline-label {
  font-weight: 700;
  color: var(--theme-primary);
  font-size: 0.9em;
  margin-bottom: 4px;
}

.timeline-item .timeline-content {
  font-size: 0.8em;
  color: var(--theme-muted-text);
}


/* ============================================================
 *  CODE BLOCKS
 * ============================================================ */

.reveal pre {
  width: 100%;
  margin: 15px 0;
  box-shadow: none;
}

.reveal pre code {
  font-family: var(--theme-font-mono);
  font-size: 0.65em;
  line-height: 1.6;
  padding: 20px 24px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.1);
  max-height: 500px;
}

.reveal code {
  font-family: var(--theme-font-mono);
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 8px;
  border-radius: 4px;
}


/* ============================================================
 *  END SLIDE
 * ============================================================ */

.end-slide {
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.end-slide h2 {
  font-size: 2.5em;
  border-bottom: none;
  display: block;
}

.end-slide .contact-info {
  margin-top: 1em;
  font-size: 0.9em;
  color: var(--theme-muted-text);
}

.end-slide .contact-info a {
  color: var(--theme-primary);
}


/* ============================================================
 *  FRAGMENTS — reveal.js animation helpers
 * ============================================================ */

.reveal .fragment.highlight-current-blue.current-fragment {
  color: var(--theme-blue);
}

.reveal .fragment.highlight-current-green.current-fragment {
  color: var(--theme-green);
}

.reveal .fragment.highlight-current-red.current-fragment {
  color: var(--theme-red);
}

.reveal .fragment.custom-fade-up {
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.5s ease;
}

.reveal .fragment.custom-fade-up.visible {
  transform: translateY(0);
  opacity: 1;
}


/* ============================================================
 *  UTILITY CLASSES
 * ============================================================ */

.small { font-size: 0.75em; }
.smaller { font-size: 0.65em; }
.large { font-size: 1.2em; }

.text-center { text-align: center; }
.text-right { text-align: right; }

.muted { color: var(--theme-muted-text); }
.text-primary { color: var(--theme-primary); }
.text-accent { color: var(--theme-accent); }
.text-blue { color: var(--theme-blue); }
.text-green { color: var(--theme-green); }
.text-orange { color: var(--theme-orange); }
.text-purple { color: var(--theme-purple); }
.text-red { color: var(--theme-red); }

.spacer { margin-top: 30px; }
.spacer-large { margin-top: 60px; }

.attribution {
  position: absolute;
  bottom: 20px;
  right: 40px;
  font-size: 0.55em;
  color: var(--theme-muted-text);
  opacity: 0.6;
}

.logo {
  position: absolute;
  top: 20px;
  right: 30px;
  height: 80px;
  opacity: 0.8;
}

.logo.left {
  right: auto;
  left: 30px;
}

.logo.large {
  height: 80px;
}


/* ============================================================
 *  LINKS
 * ============================================================ */

.reveal a {
  color: var(--theme-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.reveal a:hover {
  color: var(--theme-accent);
  text-decoration: underline;
}


/* ============================================================
 *  REVEAL.JS CONTROLS & UI
 * ============================================================ */

.reveal .controls {
  color: var(--theme-primary);
}

.reveal .progress {
  color: var(--theme-primary);
  height: 4px;
}

.reveal .slide-number {
  font-family: var(--theme-font-body);
  font-size: 14px;
  color: var(--theme-muted-text);
  background: transparent;
  right: 16px;
  bottom: 10px;
}


/* ============================================================
 *  SCROLLBAR
 * ============================================================ */

.reveal ::-webkit-scrollbar {
  width: 6px;
}

.reveal ::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
}

.reveal ::-webkit-scrollbar-thumb {
  background: var(--theme-primary);
  border-radius: 3px;
}


/* ============================================================
 *  PRINT / PDF EXPORT
 *  Activate with ?print-pdf in URL
 * ============================================================ */

@media print {
  .reveal .slides section {
    page-break-after: always;
    page-break-inside: avoid;
  }

  .reveal .slides {
    width: 100% !important;
    height: auto !important;
  }

  .reveal .controls,
  .reveal .progress,
  .reveal .slide-number {
    display: none !important;
  }

  .reveal .slide-background {
    background: var(--theme-gradient) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}