/*
 * ============================================================
 *  LIGHT THEME for reveal.js
 *  HTML Slides Starter Kit — xkiwilabs.com
 * ============================================================
 *
 *  A clean, light-background academic theme inspired by the
 *  PSYC4411 slide style at Macquarie University.
 *
 *  White/light grey background, dark text, coloured accents.
 *  Use this when you want a traditional academic slide look.
 *
 *  ╔══════════════════════════════════════════════════════════╗
 *  ║  CUSTOMISE THESE — Change the variables below to        ║
 *  ║  match your university or organisation's brand.          ║
 *  ╚══════════════════════════════════════════════════════════╝
 */

:root {
  /* === PRIMARY BRAND COLOURS === */
  --theme-primary: #A71930;        /* Main accent — headings, bullets       */
  --theme-primary-dark: #8B1428;   /* Darker variant — gradients            */
  --theme-primary-light: #D4533B;  /* Lighter variant                       */
  --theme-gold: #C8972C;           /* Secondary accent — key insights       */

  /* === BACKGROUND & TEXT === */
  --theme-charcoal: #2D2D2D;       /* Primary text colour                   */
  --theme-grey: #8C8C8C;           /* Secondary / muted text                */
  --theme-light-grey: #F5F5F5;     /* Panel backgrounds                     */
  --theme-white: #FFFFFF;          /* Slide background                      */
  --theme-near-black: #1a1a1a;     /* Code block background                 */

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

  /* === TYPOGRAPHY === */
  --theme-font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --theme-font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}


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

.reveal {
  font-family: var(--theme-font-main);
  font-size: 32px;
  font-weight: 400;
  color: var(--theme-charcoal);
}

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

.reveal .slides section {
  padding: 40px 60px;
  box-sizing: border-box;
}


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

.reveal h1 {
  font-size: 2.4em;
  font-weight: 800;
  color: var(--theme-primary);
  margin-bottom: 0.3em;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-transform: none;
}

.reveal h2 {
  font-size: 1.8em;
  font-weight: 700;
  color: var(--theme-primary);
  margin-bottom: 0.4em;
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-transform: none;
}

.reveal h3 {
  font-size: 1.3em;
  font-weight: 600;
  color: var(--theme-charcoal);
  margin-bottom: 0.3em;
  line-height: 1.2;
  text-transform: none;
}

.reveal h4 {
  font-size: 1.0em;
  font-weight: 600;
  color: var(--theme-grey);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5em;
}

.reveal p {
  font-size: 0.95em;
  line-height: 1.55;
  margin-bottom: 0.5em;
  font-weight: 400;
}

.reveal strong {
  font-weight: 700;
  color: var(--theme-charcoal);
}

.reveal em {
  color: var(--theme-grey);
}


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

.reveal ul {
  list-style: none;
  margin-left: 0.5em;
  margin-bottom: 0.5em;
}

.reveal ul > li {
  font-size: 0.95em;
  line-height: 1.45;
  margin-bottom: 0.3em;
  padding-left: 0.2em;
}

.reveal ul > li::before {
  content: "▸";
  color: var(--theme-primary);
  font-weight: 700;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

.reveal li li {
  font-size: 0.88em;
  color: var(--theme-grey);
}

.reveal ol {
  margin-left: 0.5em;
}

.reveal ol li {
  font-size: 0.95em;
  line-height: 1.45;
  margin-bottom: 0.3em;
}


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

.title-slide {
  text-align: center;
  padding: 80px 60px;
}

.title-slide h1 {
  color: var(--theme-white);
  font-size: 2.6em;
  margin-bottom: 0.2em;
}

.title-slide h2 {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.2em;
  font-weight: 400;
  margin-bottom: 1em;
}

.title-slide .subtitle {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.7em;
  font-weight: 300;
}

.title-slide .course-code {
  display: inline-block;
  background: var(--theme-primary);
  color: white;
  padding: 0.2em 0.8em;
  border-radius: 4px;
  font-size: 0.65em;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 0.5em;
}


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

.section-divider {
  text-align: center;
  padding: 80px 60px;
}

.section-divider h2 {
  color: var(--theme-white);
  font-size: 2.2em;
  font-weight: 800;
  margin-bottom: 0.3em;
}

.section-divider p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85em;
  font-weight: 300;
}


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

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.two-col-wide-left {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 40px;
  align-items: start;
}

.two-col-wide-right {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 40px;
  align-items: start;
}

.col img {
  max-width: 100%;
  border-radius: 8px;
}


/* ============================================================
 *  HIGHLIGHT / INFO / KEY INSIGHT BOXES
 * ============================================================ */

.highlight-box {
  background: rgba(167, 25, 48, 0.08);
  border-left: 4px solid var(--theme-primary);
  padding: 16px 24px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
}

.highlight-box p {
  margin-bottom: 0;
  font-size: 0.95em;
}

.info-box {
  background: rgba(74, 144, 217, 0.08);
  border-left: 4px solid var(--theme-blue);
  padding: 16px 24px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
}

.key-insight {
  background: rgba(200, 151, 44, 0.1);
  border-left: 4px solid var(--theme-gold);
  padding: 16px 24px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
}


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

.tag {
  display: inline-block;
  padding: 0.15em 0.6em;
  border-radius: 20px;
  font-size: 0.6em;
  font-weight: 600;
  letter-spacing: 0.03em;
  vertical-align: middle;
}

.tag-primary { background: rgba(167, 25, 48, 0.12); color: var(--theme-primary); }
.tag-blue { background: rgba(74, 144, 217, 0.12); color: var(--theme-blue); }
.tag-green { background: rgba(91, 165, 91, 0.12); color: var(--theme-green); }
.tag-orange { background: rgba(232, 135, 61, 0.12); color: var(--theme-orange); }
.tag-purple { background: rgba(123, 104, 168, 0.12); color: var(--theme-purple); }


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

.reveal code {
  font-family: var(--theme-font-mono);
  font-size: 0.85em;
  background: var(--theme-light-grey);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  color: var(--theme-primary-dark);
}

.reveal pre {
  background: var(--theme-near-black);
  border-radius: 8px;
  padding: 20px;
  font-size: 0.55em;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.reveal pre code {
  background: none;
  color: #e0e0e0;
  padding: 0;
}


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

.end-slide {
  text-align: center;
  padding: 80px 60px;
}

.end-slide h1 {
  color: var(--theme-white);
  font-size: 2.2em;
}

.end-slide p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.8em;
}


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

.small { font-size: 0.75em; color: var(--theme-grey); }
.attribution { font-size: 0.6em; color: var(--theme-grey); text-align: right; margin-top: 1em; }
.spacer { height: 12px; }
.spacer-sm { height: 6px; }
.spacer-lg { height: 24px; }
.text-center { text-align: center; }


/* ============================================================
 *  REVEAL.JS CONTROLS
 * ============================================================ */

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

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

.reveal .slide-number {
  font-family: var(--theme-font-main);
  color: var(--theme-grey);
  background: transparent;
}


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

.reveal a {
  color: var(--theme-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(74, 144, 217, 0.3);
  transition: border-color 0.2s;
}

.reveal a:hover {
  border-bottom-color: var(--theme-blue);
}


/* ============================================================
 *  PRINT / PDF
 * ============================================================ */

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