:root{--bg: #f8fafc;--surface: #ffffff;--border: #e2e8f0;--muted: #64748b;--text: #0f172a;--accent: #0ea5e9;--accent-dark: #0284c7;--header-bg: #0f172a}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--header-bg);color:#f8fafc;display:flex;align-items:center;padding:0 24px;height:56px;gap:32px;border-bottom:1px solid #1e293b}.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px}.header-nav{display:flex;gap:8px}.nav-link{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:6px;color:#cbd5e1;text-decoration:none;font-size:13px}.nav-link:hover{background:#1e293b;color:#fff}.nav-link.active{background:var(--accent);color:#fff}.main{flex:1;padding:28px 40px;max-width:1280px;width:100%;margin:0 auto}h1{margin:0 0 16px;font-size:22px}h3{margin:0 0 10px;font-size:14px;color:#334155}.muted{color:var(--muted);font-size:13px}.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:16px 18px;margin-top:16px}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;background:#f1f5f9;padding:1px 6px;border-radius:4px}.kv-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px 24px}.kv-k{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.kv-v{font-size:13px;margin-top:3px}.policy-table{width:100%;border-collapse:collapse;margin-top:8px;font-size:13px}.policy-table th,.policy-table td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border)}.policy-table th{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;background:#f8fafc}.policy-table tr:last-child td{border-bottom:none}.playground-textarea{width:100%;min-height:140px;padding:10px 12px;border:1px solid var(--border);border-radius:6px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;line-height:1.5;resize:vertical}.playground-actions{display:flex;gap:10px;margin-top:12px;align-items:center;flex-wrap:wrap}.btn-primary{background:var(--accent);color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:13px;font-weight:600;cursor:pointer}.btn-primary:hover{background:var(--accent-dark)}.btn-primary:disabled{background:#94a3b8;cursor:not-allowed}.file-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:1px dashed var(--border);border-radius:6px;font-size:13px;cursor:pointer;background:#f8fafc}.file-btn:hover{background:#f1f5f9}.sample-btn{font-size:11px;padding:4px 8px;border:1px solid var(--border);border-radius:4px;background:#f8fafc;cursor:pointer}.sample-btn:hover{background:#e2e8f0}.diff-panel{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;line-height:1.6;white-space:pre-wrap;word-break:break-word;max-height:320px;overflow-y:auto;background:#f8fafc;border:1px solid var(--border);border-radius:6px;padding:12px}.metric-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-top:16px}.metric{background:#fff;border:1px solid var(--border);border-radius:8px;padding:12px 14px}.metric-k{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.metric-v{font-size:20px;font-weight:700;margin-top:4px}.metric-sub{font-size:11px;color:var(--muted);margin-top:2px}