/* ==========================================================================
   RA1 SLIDESHOW PRESENTATION SYSTEM
   Modern slideshow inspired by master folder's approach
   ========================================================================== */

:root {
  /* Colors - Consistent with main design system */
  --color-base: #000;
  --color-bg: #fff;
  --color-grey: #939393;
  --color-grey-dark: rgba(0, 0, 0, 0.65);
  --color-grey-light: rgba(0, 0, 0, 0.1);
  --color-accent: #0366d6;
  --color-accent-hover: #db4a38;
  --color-white: #fff;
  --color-black: #000;
  
  /* Slideshow specific colors */
  --color-slide-bg: #fafafa;
  --color-slide-dark: #1a1a1a;
  --color-slide-light: #f8f9fa;
  --color-progress: #0366d6;
  --color-control: rgba(0, 0, 0, 0.7);
  --color-control-hover: rgba(0, 0, 0, 0.9);
  
  /* Typography - Space Grotesk */
  --font-primary: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-md: 20px;
  --font-size-lg: 24px;
  --font-size-xl: 32px;
  --font-size-2xl: 40px;
  --font-size-3xl: 48px;
  --font-size-4xl: 56px;
  --font-size-5xl: 64px;
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-base: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Layout */
  --container-max-width: 800px;
  --navbar-height: 60px;
  --controls-height: 60px;
  --progress-height: 4px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-slide: 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

*,
*:before,
*:after {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background-color: var(--color-bg);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: greyscale;
}

body {
  margin: 0;
  font-family: var(--font-primary);
  color: var(--color-base);
  background-color: var(--color-bg);
  overflow-x: hidden;
  height: 100vh;
}

/* ==========================================================================
   NAVBAR STYLES
   ========================================================================== */

.navbar {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-grey-light);
  height: var(--navbar-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--container-max-width);
  padding: 0 var(--spacing-lg);
  z-index: 1000;
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

/* Navbar theme variants based on slide backgrounds */
.navbar.navbar-light {
  background: var(--color-slide-light);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.navbar.navbar-dark {
  background: var(--color-slide-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.navbar.navbar-dark .navbar__logo {
  color: var(--color-white);
}

.navbar.navbar-dark .navbar__menu--links {
  color: rgba(255, 255, 255, 0.8);
}

.navbar.navbar-dark .navbar__menu--links:hover {
  color: var(--color-white);
}

.navbar__logo {
  color: var(--color-grey-dark);
  cursor: pointer;
  text-decoration: none;
  font-size: 1.8rem;
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  display: flex;
  align-items: center;
  margin: 0;
}

.navbar__bars {
  opacity: 0;
}

.navbar__menu {
  list-style: none;
  display: flex;
  align-items: center;
  margin: 0;
}

.navbar__menu--links {
  color: var(--color-grey);
  text-decoration: none;
  padding: 0 15px;
  font-weight: var(--font-weight-normal);
  font-size: var(--font-size-sm);
  font-family: var(--font-primary);
  transition: var(--transition-fast);
}

.navbar__menu--links:hover {
  color: var(--color-grey-dark);
}

/* Mobile navbar */
@media (max-width: 1023px) {
  .navbar__bars {
    color: var(--color-base);
    opacity: 1;
    position: absolute;
    top: 22px;
    right: var(--spacing-lg);
    font-size: 32px;
    cursor: pointer;
  }

  .navbar__menu {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    border-bottom: 1px solid var(--color-grey-light);
    padding: 20px 0;
    z-index: 999;
  }
  
  .navbar__menu.active {
    display: flex;
  }
  
  .navbar__menu--links {
    padding: 15px 0;
    font-size: 18px;
  }
}

/* ==========================================================================
   SLIDE NAVIGATION LIST
   ========================================================================== */

.slide-navigation {
  position: fixed;
  left: var(--spacing-lg);
  top: var(--navbar-height);
  bottom: var(--spacing-lg);
  z-index: 998;
  width: 180px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: var(--spacing-base);
}

.slide-nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 4px var(--spacing-sm);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-fast);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(5px);
}

.slide-nav-item:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: translateX(2px);
}

.slide-nav-item.active {
  background: var(--color-accent);
  color: var(--color-white);
  transform: translateX(4px);
  box-shadow: 0 2px 8px rgba(3, 102, 214, 0.4);
}

.slide-nav-number {
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  background: var(--color-grey-light);
  color: var(--color-grey-dark);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
}

.slide-nav-item.active .slide-nav-number {
  background: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

.slide-nav-title {
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  line-height: 1.1;
  color: var(--color-grey-dark);
}

.slide-nav-item.active .slide-nav-title {
  color: var(--color-white);
}

/* ==========================================================================
   SLIDESHOW CONTROLS
   ========================================================================== */

.slideshow-controls {
  position: fixed;
  bottom: var(--spacing-lg);
  left: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-grey-light);
  border-radius: 50px;
  padding: var(--spacing-sm) var(--spacing-base);
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.control-btn {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--color-control);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: var(--transition-fast);
}

.control-btn:hover {
  background: var(--color-control-hover);
  transform: scale(1.05);
}

.control-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
}

.slide-counter {
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-grey-dark);
  min-width: 60px;
  text-align: center;
}

/* ==========================================================================
   PROGRESS PERCENTAGE
   ========================================================================== */

.progress-percentage {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  background: rgba(0, 0, 0, 0.8);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-base);
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-primary);
  z-index: 996;
  min-width: 50px;
  text-align: center;
  backdrop-filter: blur(10px);
}

/* ==========================================================================
   SLIDESHOW CONTAINER
   ========================================================================== */

.slideshow-container {
  position: relative;
  width: 100%;
  height: 100vh;
  padding-top: var(--navbar-height);
  overflow: hidden;
}

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

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transform: translateY(100%);
  transition: all var(--transition-slide);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.slide.slide-from-above {
  transform: translateY(-100%);
}

.slide.slide-from-below {
  transform: translateY(100%);
}

/* Slide variants */
.slide-dark {
  background: var(--color-slide-dark);
  color: var(--color-white);
}

.slide-light {
  background: var(--color-slide-light);
}

/* ==========================================================================
   SLIDE CONTENT
   ========================================================================== */

.slide-content {
  max-width: var(--container-max-width);
  padding: 0 var(--spacing-2xl);
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.slide-center {
  text-align: center;
  align-items: center;
}

/* Content state for inactive slides */
.slide:not(.active) .slide-content {
  opacity: 0;
  transform: translateY(20px);
}

.slide.active .slide-content {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.3s;
}

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

.slide-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.slide-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-base);
  color: var(--color-accent);
}

.slide-meta {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-normal);
  color: var(--color-grey);
  margin-bottom: 0;
}

.slide h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xl);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.slide h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-base);
  line-height: 1.3;
}

.slide-text {
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--color-grey-dark);
}

.slide-text p {
  margin-bottom: var(--spacing-lg);
}

/* Dark slide text colors */
.slide-dark .slide-text {
  color: rgba(255, 255, 255, 0.9);
}

.slide-dark .slide-meta {
  color: rgba(255, 255, 255, 0.7);
}

.slide-dark .slide-card li {
  color: rgba(255, 255, 255, 0.9);
}

/* Activity slide specific styles */
.slide-activity {
  background: var(--color-bg);
  color: var(--color-base);
}

.activity-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: var(--spacing-lg);
}

.activity-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
}

.activity-subtitle {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-grey-dark);
  margin: 0;
}

.activity-objective {
  background: var(--color-slide-light);
  padding: var(--spacing-lg);
  border-radius: 8px;
  margin-bottom: var(--spacing-xl);
  border-left: 4px solid var(--color-accent);
}

.activity-objective h3 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.activity-objective p {
  color: var(--color-grey-dark);
  line-height: 1.6;
  margin: 0;
}

.activity-steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
}

.activity-step {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  background: var(--color-white);
  padding: var(--spacing-base);
  border-radius: 8px;
  border: 1px solid var(--color-grey-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.step-number {
  background: var(--color-accent);
  color: var(--color-white);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  min-width: 32px;
}

.step-content h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

.step-content p {
  color: var(--color-grey-dark);
  line-height: 1.5;
  margin: 0;
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   SLIDE COMPONENTS
   ========================================================================== */

.slide-highlight {
  background: var(--color-slide-light);
  padding: var(--spacing-lg);
  border-radius: 8px;
  margin: var(--spacing-lg) 0;
  border-left: 4px solid var(--color-accent);
}

.slide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-base);
  margin: var(--spacing-lg) 0;
}

.slide-card {
  background: var(--color-white);
  padding: var(--spacing-base);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--color-grey-light);
}

.slide-card:hover {
  /* No hover effects */
}

.slide-card h3 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
  line-height: 1.3;
}

.slide-card p {
  font-size: var(--font-size-sm);
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}

.slide-card ul {
  margin: 0;
  padding-left: var(--spacing-base);
}

.slide-card li {
  font-size: var(--font-size-sm);
  line-height: 1.4;
  margin-bottom: var(--spacing-xs);
}

.slide-comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-xl);
  align-items: start;
  margin: var(--spacing-xl) 0;
}

.vs-divider {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  align-self: center;
  text-align: center;
  padding: var(--spacing-base);
}

.slide-list {
  list-style: none;
  padding: 0;
}

.slide-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-grey-light);
  position: relative;
  padding-left: var(--spacing-lg);
}

.slide-list li:before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
}

.slide-list li:last-child {
  border-bottom: none;
}

.slide-quote {
  font-size: var(--font-size-lg);
  font-style: italic;
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  border-left: 4px solid var(--color-accent);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
  line-height: 1.5;
}

.slide-quote cite {
  display: block;
  font-size: var(--font-size-sm);
  font-style: normal;
  font-weight: var(--font-weight-normal);
  color: var(--color-grey);
  margin-top: var(--spacing-base);
}

/* ==========================================================================
   NAVIGATION HINT
   ========================================================================== */

.navigation-hint {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-base);
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  z-index: 997;
  opacity: 0;
  animation: hintFadeIn 2s ease 1s forwards, hintFadeOut 2s ease 5s forwards;
}

@keyframes hintFadeIn {
  to { opacity: 1; }
}

@keyframes hintFadeOut {
  to { opacity: 0; }
}

/* ==========================================================================
   DATA CLUSTERING INTERACTIVE STYLES
   ========================================================================== */

.data-interactive-section {
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

.data-controls {
  display: flex;
  gap: var(--spacing-base);
  margin-bottom: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.data-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: 8px;
  font-size: var(--font-size-sm);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-fast);
  background: var(--color-accent);
  color: var(--color-white);
}

.data-btn:hover {
  background: var(--color-accent-hover);
}

.data-btn.secondary {
  background: var(--color-grey);
  color: var(--color-white);
}

.data-btn.secondary:hover {
  background: var(--color-grey-dark);
}

.data-visualization {
  display: flex;
  justify-content: center;
  margin: var(--spacing-lg) 0;
  background: var(--color-white);
  border: 2px solid var(--color-grey-light);
  border-radius: 8px;
  padding: var(--spacing-base);
}

#dataCanvas {
  border-radius: 4px;
  background: #fafafa;
  max-width: 100%;
  height: auto;
}

.data-explanation {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.data-info {
  background: var(--color-slide-light);
  padding: var(--spacing-lg);
  border-radius: 8px;
  border-left: 4px solid var(--color-accent);
  max-width: 500px;
}

.data-info h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
}

.data-info p {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.data-info ul {
  margin: 0;
  padding-left: var(--spacing-lg);
}

.data-info li {
  font-size: var(--font-size-sm);
  line-height: 1.4;
  margin-bottom: var(--spacing-xs);
}

/* Data table styles */
.data-table-container {
  display: flex;
  justify-content: center;
  margin: var(--spacing-lg) 0;
  background: var(--color-white);
  border-radius: 8px;
  padding: var(--spacing-base);
  border: 2px solid var(--color-grey-light);
  max-height: 300px;
  overflow-y: auto;
}

.data-table {
  width: 100%;
  max-width: 500px;
  border-collapse: collapse;
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
}

.data-table th,
.data-table td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--color-grey-light);
}

.data-table th {
  background: var(--color-slide-light);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  position: sticky;
  top: 0;
}

.data-table tbody tr:hover {
  background: var(--color-slide-light);
}

.data-table .highlight {
  background: rgba(3, 102, 214, 0.1);
}

.data-table .filtered-out {
  opacity: 0.3;
}

/* ==========================================================================
   IOT PHOTO DEMO STYLES
   ========================================================================== */

.iot-demo-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.iot-demo-section.compact {
  gap: var(--spacing-sm);
  margin: var(--spacing-base) 0;
}

.demo-header {
  text-align: center;
  margin-bottom: var(--spacing-base);
}

.demo-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.upload-area {
  background: var(--color-slide-light);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border-left: 4px solid var(--color-accent);
  text-align: center;
}

.upload-instructions h3 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.upload-instructions p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-grey-dark);
  font-size: var(--font-size-base);
}

.upload-controls {
  display: flex;
  gap: var(--spacing-base);
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.iot-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: 25px;
  font-size: var(--font-size-sm);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-fast);
  min-width: 160px;
}

.iot-btn.primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.iot-btn.primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.iot-btn.secondary {
  background: var(--color-grey);
  color: var(--color-white);
}

.iot-btn.secondary:hover {
  background: var(--color-grey-dark);
}

.photo-info {
  text-align: left;
  margin-top: var(--spacing-base);
}

.metadata-display {
  background: var(--color-white);
  padding: var(--spacing-base);
  border-radius: 8px;
  border: 1px solid var(--color-grey-light);
  font-size: var(--font-size-sm);
  color: var(--color-grey-dark);
  margin-top: var(--spacing-sm);
}

.photo-gallery {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border: 2px solid var(--color-grey-light);
}

.photo-gallery h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-base);
  font-size: var(--font-size-base);
  text-align: center;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--spacing-sm);
  min-height: 150px;
  align-items: center;
  justify-items: center;
}

.placeholder-message {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-grey);
  font-style: italic;
  font-size: var(--font-size-sm);
  padding: var(--spacing-xl);
}

.photo-item {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: var(--transition-fast);
}

.photo-item:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.photo-item img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  display: block;
}

.photo-timestamp {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 10px;
  padding: 2px 4px;
  text-align: center;
}

.iot-explanation {
  margin-top: var(--spacing-lg);
}

.explanation-box {
  background: rgba(3, 102, 214, 0.1);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border: 1px solid rgba(3, 102, 214, 0.2);
}

.explanation-box h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
}

.explanation-box p {
  margin: 0;
  color: var(--color-grey-dark);
  line-height: 1.6;
  font-size: var(--font-size-sm);
}

/* Compact layout styles */
.photo-gallery-compact {
  background: var(--color-slide-light);
  padding: var(--spacing-base);
  border-radius: 8px;
  border: 1px solid var(--color-grey-light);
}

.photo-grid-compact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--spacing-xs);
  min-height: 100px;
  max-height: 200px;
  overflow-y: auto;
}

.photo-grid-compact .photo-item img {
  width: 80px;
  height: 80px;
}

.iot-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.info-box {
  background: rgba(220, 53, 69, 0.1);
  padding: var(--spacing-sm);
  border-radius: 8px;
  border: 1px solid rgba(220, 53, 69, 0.2);
}

.info-box h4 {
  color: #dc3545;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.info-box p, .info-box ul {
  margin: var(--spacing-xs) 0;
  font-size: var(--font-size-xs);
  line-height: 1.4;
}

.info-list {
  margin: var(--spacing-xs) 0;
  padding-left: var(--spacing-sm);
}

.info-list li {
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-xs);
}

.metadata-info {
  background: var(--color-slide-light);
  padding: var(--spacing-sm);
  border-radius: 6px;
  border-left: 3px solid var(--color-accent);
}

.metadata-info p {
  margin: 0;
  font-size: var(--font-size-xs);
  color: var(--color-grey-dark);
}

/* ==========================================================================
   INTERACTIVE CANVAS STYLES
   ========================================================================== */

.interactive-section {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.qr-fixed {
  position: fixed;
  top: 50%;
  right: var(--spacing-lg);
  transform: translateY(-50%);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s ease;
  width: 160px; /* Make container narrower */
}

.qr-fixed.visible {
  opacity: 1;
}

.qr-container {
  background: rgba(255, 255, 255, 0.95);
  padding: var(--spacing-base);
  border-radius: 15px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  border: 2px solid var(--color-grey-light);
  backdrop-filter: blur(10px);
  text-align: center;
}

.share-link {
  text-align: center;
  max-width: 200px;
}

.share-title {
  font-size: 12px;
  font-weight: var(--font-weight-medium);
  color: var(--color-grey-dark);
  margin-bottom: var(--spacing-xs);
}

.share-url {
  font-size: 10px;
  color: var(--color-accent);
  background: var(--color-slide-light);
  padding: var(--spacing-xs);
  border-radius: 8px;
  margin-bottom: var(--spacing-xs);
  word-break: break-all;
  line-height: 1.3;
  font-family: monospace;
}

.share-btn {
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 12px;
  font-size: 11px;
  cursor: pointer;
  transition: var(--transition-fast);
  font-family: var(--font-primary);
}

.share-btn:hover {
  background: var(--color-accent-hover);
}

.share-btn:active {
  transform: scale(0.95);
}

.input-section {
  display: flex;
  gap: var(--spacing-base);
  margin-bottom: var(--spacing-xl);
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

#studentInput {
  flex: 1;
  min-width: 250px;
  padding: var(--spacing-base) var(--spacing-lg);
  border: 2px solid var(--color-grey-light);
  border-radius: 25px;
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  outline: none;
  transition: var(--transition-fast);
  background: var(--color-white);
}

#studentInput:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.1);
}

.interactive-btn {
  padding: var(--spacing-base) var(--spacing-xl);
  border: none;
  border-radius: 25px;
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.interactive-btn:not(.secondary) {
  background: var(--color-accent);
  color: var(--color-white);
}

.interactive-btn:not(.secondary):hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 12px rgba(3, 102, 214, 0.3);
}

.interactive-btn.secondary {
  background: var(--color-grey-light);
  color: var(--color-grey-dark);
}

.interactive-btn.secondary:hover {
  background: var(--color-grey);
  color: var(--color-white);
}

.canvas-container {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

#wordCanvas {
  border: 2px solid var(--color-grey-light);
  border-radius: 25px;
  background: var(--color-bg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  max-width: 100%;
  height: auto;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

/* Tablet */
@media (max-width: 1023px) {
  .slide-content {
    padding: 0 var(--spacing-xl);
  }
  
  .slide-title {
    font-size: var(--font-size-3xl);
  }
  
  .slide h2 {
    font-size: var(--font-size-2xl);
  }
  
  .slide-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-base);
  }
  
  .slide-comparison {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .vs-divider {
    order: 2;
    margin: var(--spacing-base) 0;
  }
  
  .slideshow-controls {
    gap: var(--spacing-base);
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .control-btn {
    width: 36px;
    height: 36px;
    font-size: 12px;
  }
}

/* Mobile */
@media (max-width: 530px) {
  .slide-content {
    padding: 0 var(--spacing-lg);
  }
  
  .slide-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-base);
  }
  
  .slide-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .slide-meta {
    font-size: var(--font-size-base);
  }
  
  .slide h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
  }
  
  .slide-text {
    font-size: var(--font-size-base);
  }
  
  .slide-card {
    padding: var(--spacing-sm);
  }
  
  
  .navigation-hint {
    bottom: calc(var(--spacing-lg) * 5);
    font-size: 12px;
  }
  
  .progress-percentage {
    bottom: calc(var(--spacing-lg) * 4);
    right: var(--spacing-base);
    font-size: 12px;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .slide-quote {
    font-size: var(--font-size-base);
    margin: var(--spacing-lg) 0;
  }
  
  /* Interactive elements mobile styles */
  .input-section {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  #studentInput {
    min-width: 200px;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-base);
  }
  
  .interactive-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-base);
    font-size: var(--font-size-sm);
  }
  
  #wordCanvas {
    max-width: calc(100vw - 40px);
    height: auto;
  }
  
  /* Hide QR code on mobile */
  .qr-fixed {
    display: none;
  }

  /* Hide slide navigation on mobile */
  .slide-navigation {
    display: none;
  }

  /* Activity slide mobile styles */
  .activity-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-base);
  }

  .activity-title {
    font-size: var(--font-size-2xl);
  }

  .activity-subtitle {
    font-size: var(--font-size-base);
  }

  .activity-objective {
    padding: var(--spacing-base);
    margin-bottom: var(--spacing-lg);
  }

  .activity-step {
    flex-direction: column;
    gap: var(--spacing-base);
    padding: var(--spacing-sm);
    text-align: center;
  }

  .step-number {
    width: 28px;
    height: 28px;
    font-size: 12px;
    align-self: center;
  }

  /* Data clustering mobile styles */
  .data-interactive-section {
    max-width: 100%;
  }

  .data-controls {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .data-btn {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: 14px;
  }

  #dataCanvas {
    max-width: calc(100vw - 80px);
    height: auto;
  }

  .data-info {
    padding: var(--spacing-base);
    margin: 0 var(--spacing-base);
  }
  
  .qr-container {
    padding: var(--spacing-xs);
  }
  
  #qrCanvas {
    width: 80px;
    height: 80px;
  }
  
  .qr-text {
    font-size: 10px;
  }
}

/* Ultra-wide screens */
@media (min-width: 1500px) {
  .slide-content {
    max-width: 1000px;
  }

  .slide-title {
    font-size: var(--font-size-5xl);
  }

  .slide h2 {
    font-size: var(--font-size-4xl);
  }
}

/* ==========================================================================
   PDF SLIDESHOW SPECIFIC STYLES
   ========================================================================== */

/* Ensure footer stays below slideshow */
.footer {
  position: relative;
  z-index: 0;
}

.slideshow-container {
  width: 100%;
  height: 95vh;
  background: transparent;
  border-radius: 10px;
  overflow: hidden;
  margin: 1rem 0;
  max-width: 1800px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
}

.slideshow-fallback {
  position: relative;
  width: 100%;
  height: 100%;
}

.slide-display {
  width: 100%;
  height: 100%;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-wrapper {
  position: relative;
  display: inline-block;
}

#current-slide-img {
  max-width: 100%;
  max-height: 85vh;
  min-height: 600px;
  object-fit: contain;
  display: none;
  image-rendering: crisp-edges;
  image-rendering: -webkit-optimize-contrast;
}

#pdf-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
  display: block;
  object-fit: contain;
  aspect-ratio: 16/9;
  pointer-events: none;
  transform-origin: top left;
}

.pdf-container {
  position: relative;
  width: 100%;
  max-width: 100%;
  height: 80vh;
  aspect-ratio: 16/9;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

#pdf-canvas {
  max-width: 100%;
  max-height: 100%;
  display: none;
  object-fit: contain;
}

/* Target PDF viewer internal elements to force horizontal layout */
#pdf-iframe #viewerContainer {
  writing-mode: horizontal-tb !important;
  direction: ltr !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
}

/* Global CSS to target viewerContainer in any PDF iframe */
iframe #viewerContainer,
iframe [id="viewerContainer"] {
  writing-mode: horizontal-tb !important;
  direction: ltr !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  white-space: nowrap !important;
  width: 100% !important;
  height: 100% !important;
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  justify-content: center !important;
}

/* Force all PDF pages to display horizontally */
iframe .page,
iframe [class*="page"] {
  display: inline-block !important;
  width: auto !important;
  height: 100% !important;
  max-width: 100% !important;
  object-fit: contain !important;
  aspect-ratio: 16/9 !important;
}

#loading-indicator {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 20px;
  border-radius: 10px;
  display: none;
  z-index: 1000;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.slide-controls {
  position: absolute;
  bottom: 20px;
  left: 20px;
  display: flex;
  align-items: center;
  gap: 15px;
  background: rgba(0, 0, 0, 0.8);
  padding: 12px 20px;
  border-radius: 10px;
  backdrop-filter: blur(10px);
  z-index: 100;
}

.slide-controls button {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 20px;
  font-size: 20px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-controls button:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.slide-controls button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

#slide-info {
  color: white;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  min-width: 120px;
  text-align: center;
}

.ra-content {
  max-width: 1900px;
  margin: 0 auto;
  padding: 0.5rem;
}

.ra-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #1a1a1a;
  text-align: center;
  margin-bottom: 1rem;
}

.ra-subtitle {
  font-size: 1.2rem;
  color: #666;
  text-align: center;
  margin-bottom: 2rem;
}

/* Responsive improvements */
@media (max-width: 1023px) {
  .slideshow-container {
    height: auto;
    min-height: 60vh;
    margin: 0.5rem 0;
  }

  .slide-display {
    height: auto;
    min-height: 60vh;
  }

  .slide-controls {
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 15px;
    gap: 10px;
  }

  .slide-controls button {
    width: 36px;
    height: 36px;
    font-size: 18px;
  }

  #slide-info {
    font-size: 12px;
    min-width: 100px;
  }

  .ra-content {
    padding: 0.25rem;
  }

  .ra-title {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
  }

  .ra-subtitle {
    font-size: 1rem;
    margin-bottom: 1rem;
  }

  #current-slide-img {
    max-height: 65vh;
    min-height: auto;
    width: 100%;
    height: auto;
  }

  .pdf-container {
    height: 60vh;
    min-height: 60vh;
    width: 100%;
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #pdf-canvas {
    max-width: 100%;
    max-height: 60vh;
    width: auto;
    height: auto;
  }

  #pdf-iframe {
    height: 100%;
    min-height: 60vh;
    width: 100%;
    object-fit: contain;
  }
}

@media (max-width: 530px) {
  .slideshow-container {
    height: auto;
    min-height: 50vh;
    margin: 0.25rem 0;
  }

  .slide-display {
    min-height: 50vh;
  }

  .slide-controls {
    padding: 6px 12px;
    gap: 8px;
  }

  .slide-controls button {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  #slide-info {
    font-size: 11px;
    min-width: 80px;
  }

  .ra-title {
    font-size: 1.5rem;
  }

  .ra-subtitle {
    font-size: 0.9rem;
  }

  #current-slide-img {
    max-height: 55vh;
    min-height: auto;
    width: 100%;
    height: auto;
  }

  .pdf-container {
    height: 50vh;
    min-height: 50vh;
    width: 100%;
    max-width: 100%;
    margin-left: 0;
    margin-right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #pdf-canvas {
    max-width: 100%;
    max-height: 50vh;
    width: auto;
    height: auto;
  }

  #pdf-iframe {
    height: 100%;
    min-height: 50vh;
    width: 100%;
    object-fit: contain;
  }
}