/* ColorBlind Sim — Styles */
:root {
  --bg: #f9fafb;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --accent: #2c3e8f;
  --accent-light: #e8ecf8;
  --border: #e2e4e9;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition: 0.2s ease;
}

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

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

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

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

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo svg { flex-shrink: 0; }

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 8px;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--accent-light);
  color: var(--accent);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #eef2ff 0%, #f0f4ff 100%);
  padding: 56px 24px 48px;
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* Sections */
.section-heading {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
}

.simulator-section,
.info-section,
.tips-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* Simulator grid */
.simulator-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 32px;
  align-items: start;
}

.controls-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mode-selector label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.mode-selector select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.95rem;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.input-source-tabs {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.tab-btn {
  flex: 1;
  padding: 10px 8px;
  border: none;
  background: var(--bg);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.tab-btn.active {
  background: var(--accent);
  color: #ffffff;
}

.source-panel { display: flex; flex-direction: column; gap: 12px; }
.source-panel.hidden { display: none; }

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
}

.drop-zone svg { margin-bottom: 12px; color: var(--text-secondary); }
.browse-link { color: var(--accent); font-weight: 600; text-decoration: underline; }

.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

#color-picker {
  width: 48px;
  height: 48px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 2px;
  background: none;
}

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

.action-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: opacity var(--transition);
}

.btn-primary:hover { opacity: 0.9; }

.source-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Comparison area */
.comparison-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.compare-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.compare-label {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.simulated-label { color: var(--accent); }

.image-container {
  position: relative;
  aspect-ratio: 4 / 3;
  background: #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.image-container canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: none;
}

.image-container canvas.active { display: block; }

.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: center;
  padding: 24px;
}

.placeholder.hidden { display: none; }

/* Info grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.info-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--accent);
}

.info-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Tips */
.tips-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.tips-list {
  list-style: disc;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.tips-note {
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-left: 3px solid var(--accent-light);
  padding-left: 16px;
  font-style: italic;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 24px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Legal pages */
.legal-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 24px;
}

.legal-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.legal-page .legal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  line-height: 1.7;
  color: var(--text-secondary);
}

/* About page */
.about-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 24px;
}

.about-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.about-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 860px) {
  .simulator-grid {
    grid-template-columns: 1fr;
  }

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

  .hero h1 { font-size: 1.8rem; }

  .header-inner {
    padding: 0 16px;
  }
}

@media (max-width: 480px) {
  .hero { padding: 40px 16px 32px; }
  .simulator-section,
  .info-section,
  .tips-section { padding: 32px 16px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .main-nav a { padding: 6px 12px; font-size: 0.85rem; }
  .logo-text { font-size: 1rem; }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}