:root{--bg: #0f1115;--bg-elev: #161a22;--bg-elev2: #1c2230;--border: #2a3142;--text: #e6e9ef;--text-dim: #9aa3b2;--accent: #4c8eff;--accent-hover: #6da3ff;--success: #3ddc97;--warn: #ffb84d;--danger: #ff5d5d;--grid: rgba(255, 255, 255, .05);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);min-height:100vh}body{display:flex;flex-direction:column;font-size:14px;line-height:1.5}header{padding:24px 32px 16px;border-bottom:1px solid var(--border)}header h1{margin:0 0 4px;font-size:22px;font-weight:600;letter-spacing:-.01em}.subtitle{margin:0;color:var(--text-dim);font-size:13px}main{flex:1;display:grid;grid-template-columns:280px 1fr 1fr;grid-template-rows:auto auto auto;gap:16px;padding:16px 24px;max-width:1600px;width:100%;margin:0 auto}.panel{background:var(--bg-elev);border:1px solid var(--border);border-radius:6px;padding:16px 18px}.panel h2{margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-dim);font-weight:600}#controls{grid-column:1;grid-row:1 / 3}#liveStats{grid-column:1;grid-row:3}#chartSection{grid-column:2 / 4;grid-row:1 / 2;display:flex;flex-direction:column;gap:12px}#livePanel{grid-column:2;grid-row:2 / 4}#aboutSection{grid-column:3;grid-row:2 / 4}.control-group{display:flex;flex-direction:column;margin-bottom:12px;font-size:12px;color:var(--text-dim)}.control-group label{margin-bottom:4px;text-transform:uppercase;letter-spacing:.04em;font-size:11px}.control-group select,.control-group input[type=range]{background:var(--bg-elev2);color:var(--text);border:1px solid var(--border);border-radius:4px;padding:6px 8px;font-size:13px;font-family:inherit}.control-group select:focus,.control-group input:focus{outline:1px solid var(--accent);outline-offset:0}.control-group.buttons{flex-direction:column;gap:6px;margin-top:8px}button{font-family:inherit;font-size:13px;padding:8px 12px;border-radius:4px;border:1px solid var(--border);background:var(--bg-elev2);color:var(--text);cursor:pointer;transition:background .15s,border-color .15s}button:hover:not(:disabled){background:var(--border);border-color:var(--accent)}button:disabled{opacity:.4;cursor:not-allowed}button.primary{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:500}button.primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}button.secondary{background:var(--bg-elev2)}button.ghost{background:transparent;color:var(--text-dim)}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;margin:0;font-family:JetBrains Mono,Menlo,Consolas,monospace;font-size:12px}.stats-grid dt{color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em;font-size:10px;padding-top:2px}.stats-grid dd{margin:0;color:var(--text);text-align:right;font-variant-numeric:tabular-nums}.chart-container{position:relative;height:180px;background:var(--bg-elev2);border-radius:4px;border:1px solid var(--border);padding:8px}#cartpoleCanvas{display:block;width:100%;background:var(--bg-elev2);border-radius:4px;border:1px solid var(--border);max-height:200px}.hint{margin:8px 0 0;font-size:11px;color:var(--text-dim);line-height:1.4}code{font-family:JetBrains Mono,Menlo,Consolas,monospace;font-size:11px;background:var(--bg-elev2);padding:1px 5px;border-radius:3px;border:1px solid var(--border)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}footer{padding:12px 24px 24px;text-align:center;color:var(--text-dim);font-size:11px;border-top:1px solid var(--border);margin-top:16px}footer p{margin:0}@media (max-width: 1000px){main{grid-template-columns:1fr}#controls,#liveStats,#chartSection,#livePanel,#aboutSection{grid-column:1;grid-row:auto}}