:root{--bg:#0d1117;--bg-elev:#161b22;--bg-elev-2:#1c2128;--border:#30363d;--text:#e6edf3;--text-dim:#8b949e;--accent:#4493f8;--danger:#f85149;--warn:#d29922;--ok:#3fb950}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,SF Pro,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:14px;line-height:1.55}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}code,pre{font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,monospace}pre{padding:12px;overflow-x:auto;font-size:12.5px}button,pre{background:var(--bg-elev-2);border:1px solid var(--border);border-radius:6px}button{color:var(--text);padding:8px 14px;cursor:pointer;font-size:13px}button:hover{border-color:var(--accent)}button.danger{border-color:var(--danger);color:var(--danger)}button.danger:hover{background:rgba(248,81,73,.1)}input{background:var(--bg);border:1px solid var(--border);color:var(--text);padding:8px 10px;border-radius:6px;font-size:13px;width:100%}input:focus{outline:none;border-color:var(--accent)}textarea.payload-editor{width:100%;min-height:96px;resize:vertical;background:var(--bg);border:1px solid var(--border);color:var(--text);padding:10px;border-radius:6px;font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,monospace;font-size:12.5px}textarea.payload-editor:focus{outline:none;border-color:var(--accent)}.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{background:var(--bg-elev);border-right:1px solid var(--border);padding:20px 14px;position:-webkit-sticky;position:sticky;top:0;height:100vh;overflow-y:auto}.sidebar h1{font-size:14px;margin:0 0 4px 8px;letter-spacing:.2px}.sidebar .subtitle{color:var(--text-dim);font-size:11.5px;margin:0 0 18px 8px}.sidebar .group-label{text-transform:uppercase;font-size:10.5px;color:var(--text-dim);letter-spacing:.8px;padding:14px 8px 6px}.sidebar a{display:block;color:var(--text);padding:7px 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a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}.payload-frame,.payload-preview{width:100%;min-height:220px;border:1px solid var(--border);border-radius:8px;background:#fff;color:#111}.payload-preview{padding:16px;overflow:auto}.log{background:#000;color:#c9d1d9;border:1px solid var(--border);border-radius:6px;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;min-height:120px;max-height:320px;overflow-y:auto;white-space:pre-wrap;word-break:break-all}.kv{display:grid;grid-template-columns:160px 1fr;grid-gap:6px 12px;gap:6px 12px;font-size:13px;margin:12px 0}.kv .k{color:var(--text-dim)}.callout{border-left:3px solid var(--warn);background:rgba(210,153,34,.08);padding:10px 14px;border-radius:0 6px 6px 0;margin:14px 0;font-size:13px}.callout.danger{border-color:var(--danger);background:rgba(248,81,73,.08)}table.matrix{border-collapse:collapse;width:100%;font-size:13px;margin:12px 0}table.matrix td,table.matrix 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