:root{--bg: #f4f6f9;--panel: #ffffff;--panel-2: #f0f2f6;--border: #d9dee5;--text: #1f2933;--muted: #6b7785;--accent: #2563eb;--accent-soft: #e8f0fe;--success: #16a34a;--danger: #dc2626;--warn: #d97706;--shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04)}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);font-size:14px}h1,h2,h3,h4{margin:0 0 8px}.muted{color:var(--muted)}.small{font-size:12px}code{font-family:Cascadia Code,Consolas,monospace}.app{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;justify-content:space-between;align-items:center;padding:10px 18px;background:var(--panel);border-bottom:1px solid var(--border)}.brand{font-weight:700;font-size:16px;color:var(--accent)}.topbar-right{display:flex;align-items:center;gap:12px}.layout{display:flex;flex:1;min-height:0}.sidebar{width:300px;flex-shrink:0;background:var(--panel);border-right:1px solid 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