/* ===================================
   CSS VARIABLES - SPAR BRAND COLORS
   =================================== */

:root {
  /* SPAR Brand */
  --spar-green: #007A33;
  --spar-red: #E4002B;

  /* Dark Theme */
  --bg-primary: #1a1a2e;
  --bg-surface: #16213e;
  --bg-elevated: #1f2b47;

  /* Text */
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accents */
  --accent-green: #007A33;
  --accent-green-light: #00a344;
  --accent-red: #E4002B;

  /* Status Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

a {
  color: var(--accent-green-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--spar-green);
  text-decoration: underline;
}

code {
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.9em;
}

/* ===================================
   LAYOUT
   =================================== */

.presentation-container {
  position: relative;
  width: 100%;
  max-width: 100%;
}

.presentation-section {
  min-height: auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  padding-bottom: calc(var(--spacing-2xl) + 60px);
  display: flex;
  flex-direction: column;
  position: relative;
}

.section-content {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* ===================================
   PROGRESS BAR
   =================================== */

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--spar-green), var(--spar-red));
  width: 0%;
  z-index: 101;
  transition: width var(--transition-base);
}

/* ===================================
   NAVIGATION SIDEBAR
   =================================== */

.nav-sidebar {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.nav-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.nav-dot:hover {
  background: var(--text-secondary);
  transform: scale(1.2);
}

.nav-dot.active {
  background: var(--spar-green);
  transform: scale(1.3);
  box-shadow: 0 0 0 4px rgba(0, 122, 51, 0.2);
}

/* Tooltip on hover */
.nav-dot::after {
  content: attr(title);
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-elevated);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-dot:hover::after {
  opacity: 1;
}

/* ===================================
   SECTION HEADERS
   =================================== */

.section-header {
  margin-bottom: var(--spacing-xl);
}

.section-number {
  font-size: 4rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.1);
  line-height: 1;
  display: block;
  margin-bottom: -1rem;
}

.section-title {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 400;
}

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

.title-slide {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.spar-logo-placeholder {
  margin-bottom: var(--spacing-xl);
}

.logo-text {
  font-size: 3rem;
  font-weight: 800;
  color: var(--spar-green);
  letter-spacing: 0.1em;
}

.main-title {
  font-size: 4.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--spar-green), var(--accent-green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-subtitle {
  font-size: 1.75rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

.title-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xl);
}

.meta-item {
  color: var(--text-secondary);
}

.meta-divider {
  color: var(--text-muted);
}

/* ===================================
   CONTENT GRID LAYOUTS
   =================================== */

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

.content-text {
  /* Text content styling handled by typography */
}

.content-visual {
  /* Visual content container */
  position: relative;
}

@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

/* ===================================
   FEATURE LISTS
   =================================== */

.feature-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-lg) 0;
}

.feature-list li {
  padding: 0.75rem 0;
  padding-left: 2rem;
  position: relative;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  font-size: 1.0625rem;
}

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

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--spar-green);
  font-weight: bold;
  font-size: 1.25rem;
}

.feature-list li strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===================================
   CODE SECTIONS
   =================================== */

.code-section {
  margin: var(--spacing-xl) 0;
}

.code-section h3 {
  margin-bottom: var(--spacing-md);
}

.code-block {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-lg);
}

.code-block code {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.code-explanation {
  margin-top: var(--spacing-sm);
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ===================================
   DIAGRAMS & PLACEHOLDERS
   =================================== */

.diagram-container {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid rgba(255, 255, 255, 0.05);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.diagram-svg {
  width: 100%;
  height: auto;
  max-height: 500px;
}

.diagram-placeholder {
  text-align: center;
  color: var(--text-muted);
}

.diagram-placeholder p {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.diagram-note {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
}

.screenshot-placeholder {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* ===================================
   TECH STACK GRID
   =================================== */

.tech-stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.tech-card {
  background: var(--bg-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.tech-card h4 {
  margin-bottom: var(--spacing-md);
  color: var(--spar-green);
}

.tech-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.tech-list li {
  padding: 0;
}

@media (max-width: 768px) {
  .tech-stack-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   DEMO SECTION
   =================================== */

.demo-info {
  margin: var(--spacing-xl) 0;
}

.demo-steps {
  margin-top: var(--spacing-xl);
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.step-card {
  background: var(--bg-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
  transition: all var(--transition-base);
}

.step-card:hover {
  border-color: var(--spar-green);
  transform: translateY(-4px);
}

.step-number {
  display: inline-block;
  width: 40px;
  height: 40px;
  background: var(--spar-green);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.step-card h4 {
  margin-bottom: var(--spacing-sm);
}

.step-card p {
  font-size: 0.9375rem;
  margin: 0;
}

@media (max-width: 1024px) {
  .step-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .step-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   CONCLUSION SECTION
   =================================== */

.conclusion-content {
  text-align: center;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.summary-card {
  background: var(--bg-surface);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-base);
}

.summary-card:hover {
  border-color: var(--spar-green);
  transform: translateY(-4px);
}

.summary-card h3 {
  color: var(--spar-green);
  margin-bottom: var(--spacing-md);
}

.summary-card p {
  margin: 0;
  text-align: left;
}

.next-steps {
  margin: var(--spacing-2xl) 0;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}

.final-cta {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-2xl);
  background: linear-gradient(135deg, rgba(0, 122, 51, 0.1), rgba(0, 122, 51, 0.05));
  border-radius: var(--radius-xl);
  border: 2px solid var(--spar-green);
}

.final-cta h2 {
  color: var(--spar-green);
  margin-bottom: var(--spacing-md);
}

.final-cta p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin: 0;
}

@media (max-width: 768px) {
  .summary-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   PRESENTER TOOLBAR
   =================================== */

.presenter-toolbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-elevated);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.toolbar-left,
.toolbar-center,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.toolbar-left {
  flex: 1;
}

.toolbar-center {
  flex: 0 0 auto;
}

.toolbar-right {
  flex: 1;
  justify-content: flex-end;
}

.current-section-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
}

.section-title-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.toolbar-btn {
  background: var(--bg-surface);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.toolbar-btn:hover {
  background: var(--spar-green);
  border-color: var(--spar-green);
  transform: translateY(-1px);
}

.toolbar-btn:active {
  transform: translateY(0);
}

.timer {
  font-size: 1rem;
  font-weight: 600;
  font-family: 'Fira Code', monospace;
  color: var(--text-primary);
}

/* ===================================
   MODAL
   =================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: var(--spacing-lg);
}

.modal-overlay.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  max-width: 900px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-xl);
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 2rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

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

@media (max-width: 1024px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2rem; }
  .main-title { font-size: 3.5rem; }
  .section-number { font-size: 3rem; }

  .nav-sidebar {
    right: 1rem;
  }

  .presenter-toolbar {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .toolbar-left,
  .toolbar-center,
  .toolbar-right {
    flex: 1 1 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.75rem; }
  p { font-size: 1rem; }

  .main-title { font-size: 2.5rem; }
  .main-subtitle { font-size: 1.25rem; }

  .presentation-section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .nav-sidebar {
    display: none;
  }

  .section-number {
    font-size: 2rem;
  }
}

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

.hidden {
  display: none !important;
}

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

.text-muted {
  color: var(--text-muted);
}

.text-primary {
  color: var(--text-primary);
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }