body{margin:0}:root{--hphys-color: #1f4788;--sphys-color: #2d7d3e;--natdis-color: #c8702a}.site-nav{background:#f8f9fa;padding:1rem 0;border-bottom:1px solid #dee2e6}.nav-container{display:flex;justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:0 1rem}.site-title{font-size:1.5rem;font-weight:bold;text-decoration:none;color:#333}.nav-links{display:flex;list-style:none;margin:0;padding:0;gap:2rem}.nav-links a{text-decoration:none;color:#666;font-weight:500}.course-navigation{background:#fff;border-bottom:1px solid #dee2e6;padding:0.5rem 0}.course-nav-container{max-width:1200px;margin:0 auto;padding:0 1rem;display:flex;align-items:center;gap:2rem}.course-nav-links{display:flex;list-style:none;margin:0;padding:0;gap:1.5rem}.content-header{margin-bottom:2rem;padding-bottom:1rem;border-bottom:2px solid #f1f3f4}.course-breadcrumb{font-size:0.9rem;color:#666;margin-bottom:0.5rem}.content-type-badge{display:inline-block;padding:0.25rem 0.75rem;border-radius:1rem;font-size:0.8rem;font-weight:600;text-transform:uppercase}.content-type-badge.lecture{background:#e3f2fd;color:#1976d2}.content-type-badge.quiz{background:#fff3e0;color:#f57c00}.content-type-badge.lab{background:#e8f5e8;color:#388e3c}