:root{--bg:#0f0f0f;--surface:#161616;--surface-2:#1e1e1e;--surface-3:#272727;--surface-4:#2f2f2f;--border:#2a2a2a;--border-2:#353535;--text:#e2e2e2;--text-dim:#999;--text-muted:#555;--accent:#7c6af7;--accent-dim:#7c6af726;--green:#3dd68c;--green-dim:#3dd68c1f;--red:#f87171;--red-dim:#f871711f;--amber:#fbbf24;--amber-dim:#fbbf241f;--cyan:#38bdf8;--cyan-dim:#38bdf81f;--font-ui:"Inter", "Segoe UI", sans-serif;--font-mono:"Cascadia Mono", "Consolas", monospace;--titlebar-h:36px;--statusbar-h:22px;--toolbar-w:58px;--console-h:130px;--modal-radius:10px;--modal-shadow:0 24px 60px #000000b3, 0 4px 12px #0006;--t-fast:.1s ease;--t-normal:.18s ease}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg);width:100%;height:100%;color:var(--text);font-family:var(--font-ui);-webkit-font-smoothing:antialiased;font-size:13px;line-height:1.5;overflow:hidden}button{font-family:var(--font-ui);cursor:pointer;color:inherit;background:0 0;border:none}#app{flex-direction:column;height:100vh;display:flex;overflow:hidden}#titlebar{height:var(--titlebar-h);background:var(--surface);border-bottom:1px solid var(--border);-webkit-user-select:none;user-select:none;flex-shrink:0;align-items:center;gap:12px;padding:0 14px;display:flex}.tl-lights{gap:6px;display:flex}.tl-lights span{border-radius:50%;width:11px;height:11px;display:block}.tl-close{background:#ff5f57}.tl-min{background:#febc2e}.tl-max{background:#28c840}.titlebar-logo{font-family:var(--font-mono);color:var(--accent);letter-spacing:.06em;font-size:11px;font-weight:700}.titlebar-file{text-align:center;color:var(--text-muted);flex:1;font-size:12px}.titlebar-actions{gap:6px;display:flex}.titlebar-pill{color:var(--text-dim);background:var(--surface-3);border:1px solid var(--border);transition:border-color var(--t-fast), color var(--t-fast);border-radius:20px;align-items:center;gap:5px;padding:3px 10px;font-size:11px;display:inline-flex}.titlebar-pill:hover{border-color:var(--accent);color:var(--text)}.titlebar-pill svg{flex-shrink:0;width:12px;height:12px}#workspace{flex:1;min-height:0;display:flex;overflow:hidden}chuck-challenge-panel{border-left:1px solid var(--border);flex-shrink:0;width:0;transition:width .2s;overflow:hidden}chuck-challenge-panel.panel-open{width:25%;min-width:300px;max-width:500px}#statusbar{height:var(--statusbar-h);background:var(--accent);color:#ffffffd9;-webkit-user-select:none;user-select:none;flex-shrink:0;align-items:center;gap:10px;padding:0 12px;font-size:11px;display:flex}.sb-state{font-weight:700}.sb-state.running{color:var(--green)}.sb-state.error{color:var(--red)}.sb-sep{color:#ffffff59}.sb-right{font-family:var(--font-mono);align-items:center;gap:10px;margin-left:auto;font-size:10px;display:flex}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--surface-4);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--border-2)}