*{box-sizing:border-box}:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;padding:0;min-width:320px;min-height:100vh;background-color:#fff;color:#213547}a{font-weight:500;color:#3b82f6;text-decoration:inherit}a:hover{color:#2563eb}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;cursor:pointer;transition:border-color .25s}button:focus,button:focus-visible{outline:2px solid #3b82f6;outline-offset:2px}.harness-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;background:#f5f5f5}.spinner{width:50px;height:50px;border:4px solid #e0e0e0;border-top-color:#3b82f6;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.harness-loading p{margin-top:20px;font-size:18px;color:#666}.harness-error{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;background:#f5f5f5;padding:20px;text-align:center}.harness-error h2{color:#dc2626;margin-bottom:12px;font-size:24px}.error-message{color:#666;margin-bottom:30px;font-size:16px;max-width:500px}.error-actions{display:flex;gap:12px}.error-actions button{padding:12px 24px;font-size:16px;border:none;border-radius:6px;cursor:pointer;transition:all .2s}.btn-retry{background:#3b82f6;color:#fff}.btn-retry:hover{background:#2563eb}.btn-home{background:#e5e7eb;color:#374151}.btn-home:hover{background:#d1d5db}.home-page{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);padding:40px 20px}.container{max-width:1200px;margin:0 auto}.home-page h1{color:#fff;font-size:48px;margin-bottom:8px;text-align:center}.subtitle{color:#ffffffe6;text-align:center;font-size:18px;margin-bottom:40px}.game-section{background:#fff;border-radius:12px;padding:30px;margin-bottom:30px;box-shadow:0 4px 6px #0000001a}.game-section h2{color:#333;margin-top:0;margin-bottom:20px;font-size:28px}.levels{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.level-card{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-radius:8px;text-decoration:none;color:#333;background:#f8f9fa;border:2px solid #e9ecef;transition:all .2s}.level-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001a;border-color:#3b82f6}.level-card.easy{border-left:4px solid #10b981}.level-card.medium{border-left:4px solid #f59e0b}.level-card.hard{border-left:4px solid #ef4444}.level-name{font-weight:500;flex:1}.level-badge{padding:4px 12px;border-radius:12px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.easy .level-badge{background:#d1fae5;color:#065f46}.medium .level-badge{background:#fed7aa;color:#92400e}.hard .level-badge{background:#fecaca;color:#991b1b}.info-section{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 6px #0000001a}.info-section h3{color:#333;margin-top:0;margin-bottom:16px}.info-section ol{color:#666;line-height:1.8;padding-left:20px}.info-section code{background:#f1f5f9;padding:2px 8px;border-radius:4px;font-family:Monaco,Courier New,monospace;font-size:14px;color:#3b82f6}#root,.game-harness{width:100%;height:100vh;margin:0;padding:0}