:root{--bg: #0d1117;--bg-panel: #161b22;--border: #30363d;--text: #e6edf3;--text-dim: #8b949e;--green: #1f883d;--green-hover: #2ea043;--red: #f85149;--accent: #58a6ff}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--bg-panel);flex-wrap:wrap}.brand{font-size:18px;font-weight:700}.brand-bolt{color:#f0b72f}.brand-sub{font-size:12px;font-weight:400;color:var(--text-dim);margin-left:8px}.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}#language-select{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:7px 10px;font-size:14px}.run-button{background:var(--green);color:#fff;border:1px solid rgba(240,246,252,.1);border-radius:6px;padding:8px 18px;font-size:14px;font-weight:600;cursor:pointer}.run-button:hover:not(:disabled){background:var(--green-hover)}.run-button:disabled{opacity:.6;cursor:wait}.badge{font-size:12px;font-weight:600;padding:4px 10px;border-radius:999px;border:1px solid var(--border);color:var(--text-dim)}.badge[data-route=browser]{color:#7ee787;border-color:#238636}.badge[data-route=hybrid]{color:#d2a8ff;border-color:#8957e5}.badge[data-route=sandbox]{color:#79c0ff;border-color:#1f6feb}.layout{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:0;height:calc(100vh - 110px)}@media(max-width:900px){.layout{grid-template-columns:1fr;height:auto}}.editor-pane{border-right:1px solid var(--border);min-height:300px;overflow:auto}#editor{height:100%}.cm-editor{height:100%;font-size:14px}.result-pane{display:flex;flex-direction:column;overflow:auto;padding:10px 14px;gap:6px}.result-header{display:flex;justify-content:space-between;align-items:center}.status{font-size:12px;color:var(--text-dim)}.status.running{color:var(--accent)}.status.error{color:var(--red)}.counter-mirror{font-size:12px;color:#7ee787;font-weight:600}.pane-label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);margin-top:6px}.pane-label-error{color:var(--red)}.output,.diagnostics{background:var(--bg-panel);border:1px solid var(--border);border-radius:6px;padding:10px;margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;white-space:pre-wrap;word-break:break-word;min-height:80px;max-height:40vh;overflow:auto}.diagnostics{color:var(--red);border-color:#f8514966}.preview-wrap{display:flex;flex-direction:column}.preview{background:#fff;border:1px solid var(--border);border-radius:6px;height:380px;overflow:hidden}.preview iframe{width:100%;height:100%;border:0}.footer{padding:8px 16px;border-top:1px solid var(--border);font-size:12px;color:var(--text-dim)}