/* ===== CSS Variables & Design System ===== */
:root {
  /* Colors */
  --color-bg-primary: #0a0e27;
  --color-bg-secondary: #141b3d;
  --color-bg-card: #1a2351;
  --color-bg-elevated: #22295a;
  
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-tertiary: #ec4899;
  
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.3), transparent 70%);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-primary);
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.4);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.lead {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Layout ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.main-content {
  min-height: 100vh;
  padding-bottom: var(--spacing-2xl);
}

/* ===== Header ===== */
.header {
  background: rgba(10, 14, 39, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.logo-icon {
  font-size: var(--font-size-3xl);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.logo h1 {
  font-size: var(--font-size-2xl);
  margin: 0;
}

.progress-bar {
  height: 6px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  width: 0%;
  transition: width var(--transition-slow);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.6);
}

/* ===== Modules ===== */
.module {
  display: none;
  padding: var(--spacing-2xl) 0;
  animation: fadeIn var(--transition-slow);
}

.module.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.module-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.module-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--spacing-md) auto 0;
  border-radius: var(--radius-full);
}

/* ===== Hero Section ===== */
.hero {
  text-align: center;
  padding: var(--spacing-2xl) 0;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-primary);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.6);
}

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

/* ===== Cards ===== */
.content-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.content-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(99, 102, 241, 0.6);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-sm);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.feature-card h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ===== Highlight Boxes ===== */
.highlight-box {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.15));
  border-left: 4px solid var(--color-accent-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.highlight-box h4 {
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-xs);
}

/* ===== Lists ===== */
ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-secondary);
}

li strong {
  color: var(--color-text-primary);
}

/* ===== Module Navigation ===== */
.module-nav {
  background: var(--color-bg-secondary);
  border-top: 1px solid rgba(99, 102, 241, 0.2);
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
  padding: var(--spacing-md) 0;
  position: sticky;
  bottom: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
}

.module-nav.hidden {
  display: none;
}

.module-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-elevated);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
}

.nav-btn:hover {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  transform: translateY(-2px);
}

.nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.module-indicator {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

/* ===== Feedback Loops ===== */
.loop-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.loop-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 2px solid;
  transition: all var(--transition-base);
}

.loop-card.reinforcing {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
  border-color: var(--color-success);
}

.loop-card.balancing {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.1));
  border-color: var(--color-warning);
}

.loop-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

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

.loop-card .example {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
}

/* ===== System Archetypes ===== */
.archetype-list {
  display: grid;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.archetype-item {
  background: var(--color-bg-elevated);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all var(--transition-base);
}

.archetype-item:hover {
  border-color: var(--color-accent-primary);
  transform: translateX(5px);
}

.archetype-item h4 {
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-xs);
}

.archetype-item .example {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-style: italic;
}

/* ===== Leverage Points ===== */
.leverage-ladder {
  display: grid;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.leverage-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  transition: all var(--transition-base);
}

.leverage-item:hover {
  transform: translateX(5px);
}

.leverage-item .level {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.leverage-item.low {
  background: rgba(148, 163, 184, 0.1);
  border-color: var(--color-text-muted);
}

.leverage-item.low .level {
  background: var(--color-text-muted);
  color: var(--color-bg-primary);
}

.leverage-item.medium {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning);
}

.leverage-item.medium .level {
  background: var(--color-warning);
  color: var(--color-bg-primary);
}

.leverage-item.high {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--color-accent-primary);
}

.leverage-item.high .level {
  background: var(--color-accent-primary);
  color: white;
}

.leverage-item.highest {
  background: rgba(236, 72, 153, 0.1);
  border-color: var(--color-accent-tertiary);
}

.leverage-item.highest .level {
  background: var(--color-accent-tertiary);
  color: white;
}

.leverage-item .content strong {
  display: block;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

/* ===== Iceberg Model ===== */
.iceberg-diagram {
  display: grid;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
  position: relative;
}

.iceberg-level {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 2px solid;
  position: relative;
  transition: all var(--transition-base);
}

.iceberg-level:hover {
  transform: scale(1.02);
  z-index: 10;
}

.iceberg-level.events {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(99, 102, 241, 0.1));
  border-color: var(--color-accent-primary);
}

.iceberg-level.patterns {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(139, 92, 246, 0.05));
  border-color: var(--color-accent-secondary);
}

.iceberg-level.structures {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(236, 72, 153, 0.05));
  border-color: var(--color-accent-tertiary);
}

.iceberg-level.mental-models {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
  border-color: var(--color-success);
}

.level-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.level-header .icon {
  font-size: var(--font-size-2xl);
}

.level-header h4 {
  margin: 0;
  color: var(--color-text-primary);
}

.iceberg-level .example {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-style: italic;
}

/* ===== Interactive Canvas ===== */
.interactive-canvas {
  min-height: 400px;
  background: var(--color-bg-secondary);
  border: 2px dashed rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-lg);
  margin: var(--spacing-lg) 0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* ===== Completion Screen ===== */
.completion-hero {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.completion-icon {
  font-size: 5rem;
  margin-bottom: var(--spacing-lg);
  animation: bounce 1s ease-in-out;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.completion-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.next-steps {
  background: var(--color-bg-card);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  text-align: left;
}

.next-steps h3 {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.next-steps ul {
  list-style: none;
  margin-left: 0;
}

.next-steps li {
  padding-left: var(--spacing-lg);
  position: relative;
  margin-bottom: var(--spacing-sm);
}

.next-steps li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* ===== Footer ===== */
.app-footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
  border-top: 1px solid rgba(99, 102, 241, 0.2);
}

.app-footer p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.app-footer strong {
  color: var(--color-accent-primary);
  font-weight: 600;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .loop-types {
    grid-template-columns: 1fr;
  }
  
  .completion-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .module-nav .container {
    gap: var(--spacing-sm);
  }
  
  .nav-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
  }
}

/* ===== Utility Classes ===== */
.hidden {
  display: none !important;
}

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

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}