:root{--primary-color: #667eea;--secondary-color: #764ba2;--accent-color: #f093fb;--text-dark: #2d3748;--text-light: #4a5568;--bg-light: #ffffff;--bg-card: #f7fafc;--border-color: #e2e8f0;--success-color: #48bb78;--warning-color: #ed8936;--error-color: #f56565;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05)}*{box-sizing:border-box}.container{max-width:1200px;margin:0 auto;padding:2rem}.header{text-align:center;margin-bottom:3rem;padding:2rem;background:var(--bg-light);border-radius:16px;box-shadow:var(--shadow-lg)}.header h1{font-size:2.5rem;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}.header p{color:var(--text-light);font-size:1.125rem;max-width:600px;margin:0 auto}.demo-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(400px,1fr));gap:2rem;margin-bottom:2rem}.demo-card{background:var(--bg-light);border-radius:16px;padding:2rem;box-shadow:var(--shadow);transition:transform .2s ease,box-shadow .2s ease}.demo-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.demo-card h2{color:var(--text-dark);margin-bottom:1rem;font-size:1.5rem;display:flex;align-items:center;gap:.5rem}.demo-card h3{color:var(--text-dark);margin:1.5rem 0 1rem;font-size:1.25rem}.demo-card p{color:var(--text-light);margin-bottom:1.5rem;line-height:1.6}.button-group{display:flex;gap:.75rem;flex-wrap:wrap;margin:1rem 0}.btn{padding:.75rem 1.5rem;border:none;border-radius:8px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;gap:.5rem}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}.btn:active{transform:translateY(0)}.btn-primary{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff}.btn-success{background:var(--success-color);color:#fff}.btn-warning{background:var(--warning-color);color:#fff}.btn-outline{background:transparent;border:2px solid var(--primary-color);color:var(--primary-color)}.btn-outline:hover{background:var(--primary-color);color:#fff}.counter-display{font-size:2rem;font-weight:700;color:var(--text-dark);text-align:center;padding:1rem;background:var(--bg-card);border-radius:12px;margin:1rem 0;border:3px solid var(--border-color)}.status-display{padding:1rem;border-radius:8px;margin:1rem 0;font-weight:500;text-align:center;transition:all .3s ease}.status-even{background:linear-gradient(135deg,#e6fffa,#b2f5ea);color:#2d7d6b;border:2px solid #81e6d9}.status-odd{background:linear-gradient(135deg,#fff5f5,#fed7d7);color:#c53030;border:2px solid #feb2b2}.user-card{background:var(--bg-card);border-radius:12px;padding:1.5rem;margin:1rem 0;border:2px solid var(--border-color)}.user-info{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin:1rem 0}.info-item{padding:1rem;background:var(--bg-light);border-radius:8px;border-left:4px solid var(--primary-color)}.info-item label{font-size:.875rem;color:var(--text-light);font-weight:500;text-transform:uppercase;letter-spacing:.05em}.info-item span{display:block;font-size:1.125rem;color:var(--text-dark);font-weight:600;margin-top:.25rem}.performance-metrics{background:var(--bg-card);border-radius:12px;padding:1.5rem;margin:1rem 0}.metrics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem;margin-top:1rem}.metric-item{text-align:center;padding:1rem;background:var(--bg-light);border-radius:8px}.metric-value{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.metric-label{font-size:.875rem;color:var(--text-light);margin-top:.25rem}.console-log{background:#1a202c;color:#e2e8f0;padding:1rem;border-radius:8px;font-family:Fira Code,Courier New,monospace;font-size:.875rem;margin:1rem 0;max-height:200px;overflow-y:auto}.log-item{margin:.25rem 0;padding:.25rem 0;border-bottom:1px solid #2d3748}.alert{padding:1rem;border-radius:8px;margin:1rem 0;border-left:4px solid}.alert-info{background:#ebf8ff;border-color:#3182ce;color:#2a69ac}.features-list{list-style:none;margin:1rem 0}.features-list li{padding:.5rem 0;color:var(--text-light);display:flex;align-items:center;gap:.5rem}.features-list li:before{content:"✨";font-size:1rem}@media (max-width: 768px){.container{padding:1rem}.demo-grid{grid-template-columns:1fr}.button-group{justify-content:center}.user-info{grid-template-columns:1fr}}