/* STE Clarity Switch - Stylesheet */

:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-light: #94a3b8;
  --bg-primary: #0a0f1a;
  --bg-secondary: #0f172a;
  --bg-accent: #1e293b;
  --success-color: #34d399;
  --warning-color: #fbbf24;
  --border-color: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --max-width: 1000px;
}

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

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
}

a {
  color: var(--primary-light);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.site-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.home-mark img {
  border-radius: 50%;
  display: block;
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.brand-name {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--text-light);
}

.btn-nav-cta {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: white;
  background: #16a34a;
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: background 0.2s;
}
.btn-nav-cta:hover {
  background: #15803d;
  text-decoration: none;
}

/* Hero */
.hero {
  text-align: center;
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.teaching-context {
  max-width: 36rem;
  margin: 0.75rem auto 1rem;
  padding: 0.85rem 1.1rem;
  background: var(--bg-accent);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  line-height: 1.55;
  text-align: left;
  color: var(--text-secondary);
}

.teaching-context p + p {
  margin-top: 0.5rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.date-badge {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

/* Demo Section */
.demo-section {
  padding: var(--spacing-md) 0 var(--spacing-lg);
}

.controls-row {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-md);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.control-group select {
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  background: var(--bg-accent);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-right: 0.25rem;
}

.toggle-btn {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn:hover {
  border-color: var(--primary-light);
  color: var(--text-primary);
}

.toggle-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

/* Comparison Area */
.comparison-area {
  display: grid;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.comparison-area.view-before {
  grid-template-columns: 1fr;
}
.comparison-area.view-before .panel-after {
  display: none;
}

.comparison-area.view-after {
  grid-template-columns: 1fr;
}
.comparison-area.view-after .panel-before {
  display: none;
}

.comparison-area.view-split {
  grid-template-columns: 1fr 1fr;
}

.text-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-accent);
  border-bottom: 1px solid var(--border-color);
}

.panel-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
}

.badge-before {
  background: rgba(251, 191, 36, 0.15);
  color: var(--warning-color);
}

.badge-after {
  background: rgba(52, 211, 153, 0.15);
  color: var(--success-color);
}

.panel-hint {
  font-size: 0.8rem;
  color: var(--text-light);
}

.panel-content {
  padding: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

.panel-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Rules Section */
.rules-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.25rem;
}

.rules-section h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.rules-checklist {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.5rem;
}

.rules-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.rules-checklist .check {
  color: var(--success-color);
  font-weight: 600;
  flex-shrink: 0;
}

/* Explainer */
.explainer {
  padding: var(--spacing-md) 0 var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.explainer h2 {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.explainer p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  max-width: 720px;
}

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

.principle-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
}

.principle-card h4 {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.principle-card p {
  font-size: 0.85rem;
  color: var(--text-light);
  margin: 0;
}

.disclaimer {
  font-size: 0.85rem;
  color: var(--text-light);
  font-style: italic;
}

/* Footer */
.site-footer {
  background: #020617;
  padding: var(--spacing-md) 0;
  border-top: 1px solid var(--border-color);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-row p {
  margin: 0;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
}

.footer-row a {
  color: rgba(255,255,255,0.8);
}
.footer-row a:hover {
  color: white;
}

.footer-credit {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-credit p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-light);
}

.footer-credit a {
  color: var(--primary-light);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .controls-row {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .toggle-group {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .comparison-area.view-split {
    grid-template-columns: 1fr;
  }
  
  .principles-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-row {
    flex-direction: column;
    text-align: center;
  }
}