* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #fff;
  padding: 20px;
  max-width: 800px;
  margin: 0 auto;
}
h1 { font-size: 2rem; margin-bottom: 1.5rem; line-height: 1.3; }
h2 { font-size: 1.5rem; margin-top: 3rem; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid #eee; }
h3 { font-size: 1.2rem; margin-top: 2rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.1rem; margin-top: 1.5rem; margin-bottom: 0.5rem; font-weight: 600; }
p { margin-bottom: 1rem; }
strong { font-weight: 600; }
ul, ol { margin: 1rem 0 1rem 1.5rem; }
li { margin-bottom: 0.5rem; }
.intro { background: #f8f9fa; padding: 1.5rem; border-left: 4px solid #333; margin: 2rem 0; }
.main-toc { background: #f8f9fa; padding: 2rem; margin: 2rem 0; border-radius: 4px; }
.main-toc h2 { margin-top: 0; border: none; font-size: 1.5rem; margin-bottom: 1.5rem; }
.main-toc-list { list-style: none; padding-left: 0; margin: 0; }
.main-toc-list > li { margin: 1.5rem 0; padding: 1rem; background: white; border-radius: 4px; border-left: 3px solid #666; }
.main-toc-list > li > a { text-decoration: none; color: #333; font-size: 1.2rem; font-weight: 600; display: block; margin-bottom: 0.5rem; }
.main-toc-list > li > a:hover { color: #000; }
.main-toc-desc { color: #666; font-size: 0.95rem; line-height: 1.5; margin: 0; }
.section-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: #999; margin: 1.5rem 0 0.5rem; }
.nav-buttons { display: flex; gap: 1rem; margin: 2rem 0; padding: 1rem 0; border-top: 1px solid #eee; border-bottom: 1px solid #eee; flex-wrap: wrap; }
.nav-button { padding: 0.5rem 1rem; background: #f8f9fa; border: 1px solid #ddd; border-radius: 4px; text-decoration: none; color: #333; font-size: 0.9rem; }
.nav-button:hover { background: #e9ecef; }
.example { border-left: 3px solid #666; padding-left: 1rem; margin: 1.5rem 0; color: #555; }
.key { font-weight: 600; color: #333; margin: 1rem 0; padding: 1rem; background: #fff9e6; border-radius: 4px; }
table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.95rem; }
th, td { padding: 0.75rem; text-align: left; border: 1px solid #ddd; }
th { background: #f8f9fa; font-weight: 600; }
hr { border: none; border-top: 1px solid #eee; margin: 3rem 0; }
.promo-block { background: #f0f7ff; padding: 2rem; margin: 2rem 0; border-radius: 8px; border-left: 4px solid #0066cc; }
.promo-block h2 { margin-top: 0; border: none; color: #0066cc; }
.promo-block h3 { margin-top: 1.5rem; color: #333; }
.promo-block ul { margin: 1rem 0; }
.promo-link { display: inline-block; padding: 0.75rem 1.5rem; background: #0066cc; color: white; text-decoration: none; border-radius: 4px; margin-top: 1rem; font-weight: 600; }
.promo-link:hover { background: #0052a3; }
.info-box { background: #f8f9fa; border-left: 3px solid #999; padding: 1rem 1.25rem; margin: 1.5rem 0; }
.info-box p:last-child { margin-bottom: 0; }
.tip-box { background: #fff9e6; border-left: 3px solid #e6a817; padding: 1rem 1.25rem; margin: 1.5rem 0; }
.tip-box p:last-child { margin-bottom: 0; }
.question-group { margin: 2rem 0; padding: 1.5rem; background: #fafafa; border: 1px solid #eee; border-radius: 4px; }
.question-group h3 { margin-top: 0; }
.question-item { margin: 1.25rem 0; padding-bottom: 1.25rem; border-bottom: 1px solid #eee; }
.question-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.question-text { margin-bottom: 0.4rem; }
.checklist { margin: 1rem 0; }
.checklist-item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }
.checklist-item:last-child { border-bottom: none; }
.checkbox { flex-shrink: 0; }
.block-section { margin: 3rem 0; }
.next-steps ul { margin: 1rem 0 1rem 1.5rem; }
.next-steps p { margin-bottom: 0.75rem; }
@media (max-width: 768px) {
  body { padding: 15px; }
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.1rem; }
  .nav-buttons { flex-direction: column; }
  .promo-block { padding: 1.5rem; }
  .question-group { padding: 1rem; }
}