.skip-link{position:absolute;top:-40px;left:0;background:var(--primary);color:#fff;padding:8px 16px;text-decoration:none;font-weight:600;border-radius:0 0 4px;z-index:10001;transition:top .2s ease}.skip-link:focus{top:0;outline:3px solid var(--primary-dark);outline-offset:2px}body{display:flex;min-height:100vh;margin:0;padding:0;background:var(--bg-secondary);color:var(--text-primary);transition:background-color .3s ease,color .3s ease}.sidebar{width:280px;background:var(--bg-secondary);border-right:1px solid var(--border-color);position:fixed;height:100vh;overflow-y:auto;padding:30px 0;z-index:100;transition:all .3s ease;will-change:transform;contain:layout style paint}.sidebar-header{padding:0 20px 20px;border-bottom:2px solid var(--border-color);margin-bottom:20px}.sidebar-header h1{font-size:1.2rem;color:var(--text-primary);margin-bottom:12px;font-weight:700}.sidebar-header .back-home{display:inline-flex;align-items:center;gap:6px;color:var(--primary);text-decoration:none;font-size:.9rem;font-weight:600;padding:8px 12px;border-radius:var(--radius-md);transition:all var(--transition-base);background:var(--primary-light)}.sidebar-header .back-home:hover{background:var(--primary);color:#fff;transform:translate(-3px)}.sidebar-nav{padding:0 10px}.nav-section{margin-bottom:25px}.nav-section h3{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);padding:0 10px 8px;margin-bottom:8px;font-weight:700;border-bottom:1px solid var(--border-color)}.nav-item{display:block;padding:10px 12px;color:var(--text-primary);text-decoration:none;border-radius:var(--radius-md);font-size:.9rem;font-weight:500;transition:all var(--transition-base);margin-bottom:4px;position:relative}.nav-item:hover{background:var(--primary-light);color:var(--primary);transform:translate(4px)}.nav-item:focus{outline:2px solid var(--primary);outline-offset:2px}.nav-item.active{background:var(--primary);color:#fff;font-weight:600}.main-content{flex:1;margin-left:280px;padding:40px;max-width:1400px}.demo-page{max-width:1000px}.demo-page>h1{font-size:2.4rem;color:var(--text-primary);margin-bottom:10px;font-weight:800}.demo-page .subtitle{font-size:1.1rem;color:var(--text-secondary);margin-bottom:30px}.section{background:var(--card-bg);border-radius:var(--radius-lg);padding:30px;margin-bottom:25px;box-shadow:var(--shadow-md);border:2px solid var(--border-color)}.section h2{font-size:1.5rem;color:var(--text-primary);margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid var(--border-color);font-weight:700}.section h3{font-size:1.1rem;color:var(--text-primary);margin:20px 0 10px;font-weight:600}.section p{color:var(--text-secondary);line-height:1.8;margin-bottom:12px}.section ul{margin-left:20px;color:var(--text-secondary);line-height:1.8}@media (max-width: 768px){body{flex-direction:column}.sidebar{display:none}.main-content{margin-left:0;padding:20px 15px}.demo-page>h1{font-size:2rem}.section{padding:20px}}