/* Voice Skill Side-by-Side
   Clean preset-toggle demo */

:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --accent-teal: #0891b2;
  --accent-teal-dark: #0e7490;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-light: #94a3b8;
  --bg-primary: #0a0f1a;
  --bg-secondary: #0f172a;
  --bg-accent: #1e293b;
  --border-color: #334155;
  --success-color: #34d399;
  --warning-color: #fbbf24;
  --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, 'Helvetica Neue', Arial, sans-serif;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --max-width: 1000px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

a { color: var(--accent-teal); text-decoration: none; }
a:hover { color: #22d3ee; text-decoration: underline; }

/* Header */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.home-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.14);
}

.home-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand {
  display: flex;
  flex-direction: column;
  color: var(--text-primary);
  text-decoration: none;
}
.brand:hover { text-decoration: none; color: var(--text-primary); }
.brand-name { font-weight: 700; font-size: 1rem; color: var(--accent-teal); }
.brand-sub { font-size: 0.7rem; color: var(--text-light); }

.btn-nav-cta {
  background: var(--accent-teal);
  color: #fff;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.8rem;
  text-decoration: none;
}
.btn-nav-cta:hover {
  background: var(--accent-teal-dark);
  text-decoration: none;
  color: #fff;
}

/* Hero */
.hero {
  padding: 2rem 0 1.5rem;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

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

.hero h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}

.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: 1rem;
  color: var(--text-secondary);
  margin: 0;
  max-width: 500px;
  margin-inline: auto;
}

/* Demo Section */
.demo-section {
  padding: 1.5rem 0 2rem;
}

.controls-row {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.control-group label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
}

.control-group select {
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-primary);
  background: var(--bg-accent);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
}

.control-group select:hover {
  border-color: var(--accent-teal);
}

.control-group select:focus {
  outline: none;
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 2px rgba(8, 145, 178, 0.2);
}

/* Source Display */
.source-display {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.source-display h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin: 0 0 0.5rem;
  font-weight: 600;
}

.source-text {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.output-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1rem 1.25rem;
}

.output-header {
  margin-bottom: 0.25rem;
}

.output-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.badge-default {
  background: rgba(148, 163, 184, 0.15);
  color: var(--text-light);
}

.badge-voice {
  background: rgba(8, 145, 178, 0.15);
  color: var(--accent-teal);
}

.output-hint {
  font-size: 0.75rem;
  color: var(--text-light);
  margin: 0 0 0.75rem;
}

.output-text {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-primary);
}

.output-default {
  border-left: 3px solid var(--text-light);
}

.output-voice {
  border-left: 3px solid var(--accent-teal);
}

/* Voice Rules */
.voice-rules {
  background: var(--bg-accent);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem 1.25rem;
}

.voice-rules h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-teal);
  margin: 0 0 0.5rem;
  font-weight: 600;
}

.voice-rules ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.voice-rules li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
}

/* Explainer */
.explainer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-color);
}

.explainer p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0 0 0.5rem;
  max-width: 700px;
}

.explainer .disclaimer {
  font-size: 0.8rem;
  color: var(--text-light);
  font-style: italic;
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1rem 0;
  margin-top: auto;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

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

.footer-row a {
  color: var(--text-secondary);
}

.footer-row a:hover {
  color: var(--accent-teal);
}

/* Responsive */
@media (max-width: 700px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
  
  .controls-row {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  
  .control-group select {
    width: 100%;
  }
  
  .hero {
    padding: 1.5rem 0 1rem;
  }
  
  .voice-rules ul {
    flex-direction: column;
  }
  
  .footer-row {
    flex-direction: column;
    text-align: center;
  }
}