:root {
  /* Color Palette - Industrial / Architectural Design Aesthetic */
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent: #ff4d00; /* Industrial Orange */
  --accent-muted: #3d1b00;
  --border: #333333;
  --grid-line: rgba(255, 255, 255, 0.05);
  
  /* Spacing */
  --space-unit: 8px;
  --space-sm: calc(var(--space-unit) * 2);
  --space-md: calc(var(--space-unit) * 4);
  --space-lg: calc(var(--space-unit) * 8);
  --space-xl: calc(var(--space-unit) * 12);
  
  /* Typography */
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Space Mono', monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-display);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background Grid Effect */
.grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  pointer-events: none;
}

/* Layout Containers */
.presentation-container {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.slide-content {
  flex: 1;
  padding: var(--space-xl) clamp(1rem, 10vw, 8rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Typography */
h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  text-transform: uppercase;
  line-height: 0.9;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-md);
}

.mono {
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--accent);
}

h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  border-left: 4px solid var(--accent);
  padding-left: var(--space-md);
}

p {
  color: var(--text-secondary);
  max-width: 600px;
  font-size: 1.1rem;
}

/* Components */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

/* Timeline Components */
.timeline {
  position: relative;
  margin-top: var(--space-lg);
  padding-left: var(--space-lg);
  border-left: 2px solid var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-lg);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(var(--space-lg) * -1 - 7px);
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.timeline-year {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 4px;
  display: block;
}

.timeline-content h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Roadmap Grid */
.roadmap-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.roadmap-section h3 {
  font-family: var(--font-mono);
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.roadmap-full {
  grid-column: span 2;
}

.roadmap-grid-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.nav-controls {
  display: flex;
  gap: var(--space-sm);
}

@media (max-width: 768px) {
  .roadmap-container {
    grid-template-columns: 1fr;
  }
  .roadmap-full {
    grid-column: auto;
  }
  .roadmap-grid-inner {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: var(--space-md);
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
}

.card-title {
  font-family: var(--font-mono);
  color: var(--accent);
  margin-bottom: var(--space-sm);
  display: block;
}

.list-item {
  list-style: none;
  margin-bottom: var(--space-unit);
  padding-left: var(--space-md);
  position: relative;
  font-size: 0.95rem;
}

.list-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 2px;
  background: var(--accent);
}

/* Navigation Footer */
.presentation-nav {
  padding: var(--space-md) clamp(1rem, 10vw, 8rem);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  background: rgba(15, 15, 15, 0.8);
  backdrop-filter: blur(10px);
}

.btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 24px;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.slide-number {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

/* SWOT Specifics */
.swot-header {
  display: flex;
  align-items: flex-end;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.swot-tag {
  background: var(--accent-muted);
  color: var(--accent);
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  border-radius: 20px;
}

/* Animations */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; opacity: 0; animation-fill-mode: forwards; }
.delay-2 { animation-delay: 0.2s; opacity: 0; animation-fill-mode: forwards; }
.delay-3 { animation-delay: 0.3s; opacity: 0; animation-fill-mode: forwards; }

.delay-1, .delay-2, .delay-3 {
  animation-name: slideUp;
  animation-duration: 0.6s;
  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Placeholder visuals */
.placeholder-image {
  width: 100%;
  height: 200px;
  background: #222;
  border: 1px dashed #444;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #444;
  margin-bottom: var(--space-md);
}