:root{--primary-color:#3498db;--secondary-color:#2ecc71;--font-family:"Arial, sans-serif";--background-color:#f5f5f5;--text-color:#333}body{font-family:var(--font-family);background-color:var(--background-color);color:var(--text-color);margin:0;padding:20px 30px}h1{color:var(--primary-color)}.btn{cursor:pointer;border:none;border-radius:4px;padding:10px 20px;font-size:16px}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-danger{color:#fff;background-color:#e74c3c}.demo-nav{border-bottom:2px solid #ddd;flex-wrap:wrap;gap:8px;margin-bottom:24px;padding:16px 0;display:flex}.demo-nav .btn{padding:8px 16px;font-size:14px}.demo-nav .btn-active{background-color:var(--primary-color);color:#fff}.demo-section{max-width:1400px;padding:16px 0}.demo-section h2{color:var(--primary-color);margin-bottom:8px}.demo-subsection{border-left:5px solid var(--primary-color);overflow-wrap:break-word;background-color:#fff;border-radius:0 8px 8px 0;margin-bottom:32px;padding:16px 20px;box-shadow:0 1px 4px #00000014}.demo-subsection h3{color:#1a1a1a;margin-top:0;font-size:1.3rem;font-weight:700}.demo-note{color:#1a1a1a;background-color:#fff8e1;border-left:4px solid #f5a623;border-radius:0 4px 4px 0;margin:10px 0;padding:10px 14px;font-size:1.05rem;font-weight:500;line-height:1.6}.demo-practical{border:1px solid var(--primary-color);background-color:#eef6ff;border-radius:8px;margin-top:32px;padding:16px 20px}.demo-practical h3{color:var(--primary-color);margin-top:0}.demo-practical ul{margin:0;padding-left:20px}.demo-practical li{margin-bottom:4px}.traffic-light{background:#333;border-radius:8px;flex-direction:column;align-items:center;gap:8px;width:60px;margin:12px 0;padding:12px;display:flex}.light-circle{border-radius:50%;width:40px;height:40px;transition:opacity .3s}.side-by-side{flex-wrap:wrap;gap:24px;display:flex}.side-by-side>div{flex:1;min-width:120px}.shell{border:2px solid var(--shell-bg,#ccc);border-radius:8px;margin:12px 0;overflow:hidden}.shell-title{background-color:var(--shell-bg,#ccc);color:var(--shell-text,#fff);padding:8px 16px;font-size:14px;font-weight:700}.shell-content{background-color:#fff;padding:16px}.card{background:#fff;border:1px solid #ddd;border-radius:6px;margin:8px 0;padding:16px;box-shadow:0 1px 3px #00000014}.form-group{margin-bottom:16px}.form-group label{margin-bottom:4px;font-weight:700;display:block}.form-group input[type=text],.form-group input[type=email],.form-group select{box-sizing:border-box;border:1px solid #ccc;border-radius:4px;width:100%;padding:8px 12px;font-size:16px}.form-error{color:#e74c3c;margin-top:4px;font-size:14px}.stepper-nav{align-items:center;gap:12px;margin-bottom:4px;display:flex}.stepper-tabs{flex-wrap:wrap;flex:1;gap:4px;display:flex}.stepper-tab{cursor:pointer;color:var(--text-color);background:#fff;border:1px solid #ddd;border-radius:4px;padding:6px 12px;font-size:13px;transition:all .2s}.stepper-tab:hover{border-color:var(--primary-color)}.stepper-tab-active{background-color:var(--primary-color);color:#fff;border-color:var(--primary-color);font-weight:700}.stepper-tab-done{border-color:var(--secondary-color);color:var(--secondary-color);background-color:#e8f4e8}.stepper-progress{background:#eee;border-radius:2px;height:4px;margin-bottom:20px;overflow:hidden}.stepper-progress-bar{background:var(--primary-color);border-radius:2px;height:100%;transition:width .3s}.stepper-content{min-height:200px}.stepper-split{align-items:start;gap:0;display:grid;position:relative}.stepper-split-bottom{align-items:stretch}.stepper-demo{min-width:0;min-height:0;max-height:80vh;padding-right:4px;overflow:hidden auto}.stepper-code{border-radius:8px;min-width:0;min-height:0;max-height:80vh;padding-left:4px;overflow:auto}.stepper-code-full{max-height:none}.stepper-split-bottom .stepper-code{max-height:60vh}.split-handle{cursor:col-resize;z-index:2;background:#ddd;border-radius:3px;align-self:stretch;margin:0 8px;transition:background .15s}.split-handle:hover,.split-handle:active{background:var(--primary-color)}.split-handle-horizontal{cursor:row-resize;margin:8px 0}.code-toolbar{gap:4px;display:flex}.code-viewer{background:#fafafa;border:1px solid #e0e0e0;border-radius:8px;font-size:13px;line-height:1.5;overflow:auto}.code-viewer-header{color:#666;background:#f0f0f0;border-bottom:1px solid #e0e0e0;border-radius:8px 8px 0 0;padding:8px 12px;font-size:12px;font-weight:700}.code-viewer pre{margin:0;padding:12px;overflow-x:auto}.line-number{text-align:right;color:#aaa;-webkit-user-select:none;user-select:none;width:3ch;margin-right:16px;display:inline-block}.code-toggle{color:#fff;white-space:nowrap;background-color:#6c757d;border-radius:4px;padding:6px 14px!important;font-size:13px!important}@media (width<=768px){.stepper-split{grid-template-rows:auto 22px auto!important;grid-template-columns:1fr!important}.stepper-code{max-height:50vh;position:static}.split-handle{cursor:row-resize}}.demo-practical table.demo-table{border-collapse:collapse;width:100%;margin:12px 0;font-size:.95rem}.demo-table th,.demo-table td{text-align:left;border:1px solid #ccc;padding:8px 12px}.demo-table th{background-color:var(--primary-color);color:#fff}.demo-table tr:nth-child(2n){background-color:#f0f7ff}.demo-practical pre.demo-code-block{color:#cdd6f4;background-color:#1e1e2e;border-radius:6px;margin:10px 0;padding:14px 16px;font-size:.9rem;line-height:1.5;overflow-x:auto}.route-indicator{color:#cdd6f4;background-color:#1e1e2e;border-radius:6px;align-items:center;gap:8px;margin-bottom:12px;padding:8px 14px;font-size:.9rem;display:flex}.route-indicator-label{color:#89b4fa;font-weight:600}.route-indicator-path{color:#a6e3a1;font-family:monospace;font-size:.95rem}.router-demo-container .app-container{border:2px solid var(--primary-color);border-radius:8px;overflow:hidden}.router-demo-container header{background-color:var(--primary-color);color:#fff;padding:12px 20px}.router-demo-container header h1{color:#fff;margin:0 0 8px;font-size:1.4rem}.router-demo-container .navbar{gap:12px;display:flex}.router-demo-container .nav-link{color:#ffffffb3;border-radius:4px;padding:4px 8px;text-decoration:none;transition:color .2s,background-color .2s}.router-demo-container .nav-link:hover{color:#fff;background-color:#ffffff26}.router-demo-container .nav-link.active{color:#fff;background-color:#ffffff40;font-weight:600}.router-demo-container main{min-height:200px;padding:16px 20px}.router-demo-container footer{color:#666;text-align:center;background-color:#f0f0f0;padding:10px 20px;font-size:.85rem}.router-demo-container .hero{color:#fff;text-align:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:8px;margin-bottom:20px;padding:32px 24px}.router-demo-container .hero h2{color:#fff;margin-top:0}.router-demo-container .hero .btn-primary{border-radius:6px;margin-top:12px;padding:10px 24px;text-decoration:none;display:inline-block}.router-demo-container .course-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:12px;display:grid}.router-demo-container .course-card{background-color:#fff;border:1px solid #ddd;border-radius:8px;padding:16px;transition:box-shadow .2s}.router-demo-container .course-card:hover{box-shadow:0 4px 12px #0000001a}.router-demo-container .course-badge{background-color:var(--secondary-color);color:#fff;border-radius:4px;margin-right:6px;padding:2px 8px;font-size:.75rem;font-weight:600;display:inline-block}.router-demo-container .course-category{color:#555;background-color:#e8e8e8;border-radius:4px;padding:2px 8px;font-size:.75rem;display:inline-block}.router-demo-container .card-link{color:var(--primary-color);font-weight:600;text-decoration:none}.router-demo-container .card-link:hover{text-decoration:underline}.router-demo-container .course-instructor{color:#666;font-size:.9rem}.router-demo-container .course-detail{margin-top:16px}.router-demo-container .course-description{line-height:1.6}.router-demo-container .course-nav{border-top:1px solid #ddd;justify-content:space-between;margin-top:20px;padding-top:16px;display:flex}.router-demo-container .search-bar{align-items:center;gap:12px;margin-bottom:16px;display:flex}.router-demo-container .search-bar input{border:2px solid #ddd;border-radius:6px;width:280px;padding:8px 14px;font-size:1rem;transition:border-color .2s}.router-demo-container .search-bar input:focus{border-color:var(--primary-color);outline:none}.router-demo-container .search-count{color:#666;font-size:.9rem}.router-demo-container .no-results{color:#888;padding:20px 0;font-style:italic}.router-demo-container .not-found{text-align:center;padding:40px 0}.router-demo-container .not-found h2{color:#e74c3c}