:root{--transition:all 0.3s ease;--text-dark:#1e293b;--border-light:#e2e8f0;--primary-blue:#3b82f6;--primary-dark-blue:#1d4ed8;--success-green:#10b981}body{font-family:'Inter',sans-serif;background-color:#f9fafb;color:var(--text-dark);line-height:1.6;scroll-behavior:smooth}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.card{background:#fff;border-radius:1rem;padding:1.5rem;box-shadow:0 4px 12px rgba(0,0,0,.08);border:1px solid var(--border-light)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;border-radius:.75rem;text-decoration:none;transition:var(--transition);min-height:44px}.btn-primary{background:linear-gradient(135deg,var(--primary-blue),var(--primary-dark-blue));color:#fff;box-shadow:0 4px 12px rgba(59,130,246,.25)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(59,130,246,.35)}.badge{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .75rem;background:#f0f9ff;color:var(--primary-dark-blue);font-size:.75rem;font-weight:600;border-radius:9999px;border:1px solid #bfdbfe}.progress-bar{height:.5rem;background:#e2e8f0;border-radius:9999px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--success-green),#34d399);border-radius:9999px;width:0;transition:width 1s ease-out}.toc-sidebar{position:sticky;top:1.5rem;max-height:calc(100vh - 3rem);overflow-y:auto;padding:1rem;background:#fff;border-radius:1rem;box-shadow:0 2px 8px rgba(0,0,0,.05);border:1px solid var(--border-light)}.toc-sidebar ul{list-style:none;padding:0;margin:0}.toc-sidebar li{margin-bottom:.5rem}.toc-sidebar a{display:block;padding:.5rem;color:#475569;text-decoration:none;border-radius:.5rem;font-size:.875rem}.toc-sidebar a:hover,.toc-sidebar a.active{background:#eff6ff;color:var(--primary-dark-blue);font-weight:600}@media (max-width:1024px){.toc-container{display:none}}.accordion-header,.faq-question{cursor:pointer;padding:1rem;background:#f8fafc;border-radius:.75rem;margin-bottom:.5rem}.accordion-content,.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.3s ease,padding 0.3s ease}.accordion-content.open,.faq-answer.open{padding:1rem;max-height:500px}@media (max-width:768px){.main-grid{grid-template-columns:1fr}.toc-container,aside{display:block;order:2}.toc-sidebar{position:static;max-height:none;margin-bottom:1.5rem}.btn{width:100%}}.section-header{text-align:center;margin-bottom:2rem;padding:0 1rem}.section-header::after{content:'';display:block;width:80px;height:3px;background:linear-gradient(135deg,var(--primary-blue) 0%,#a855f7 100%);margin:.75rem auto 0;border-radius:2px}.section-header h2{font-size:2.25rem;font-weight:800;background:linear-gradient(135deg,var(--text-dark) 0%,#334155 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}.section-header p{color:var(--text-medium);max-width:650px;margin:0 auto;font-size:1.125rem}