:root{--bg: #e2e2e2;--fg: #000000;--muted: #666666;--card: #f4f4f4;--card-hover: #eaeaea;--border: #000000;--border-soft: #cccccc;--danger: #000000}*{box-sizing:border-box}html,body,#root{height:100%;margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:13px;line-height:1.45}button{font-family:inherit;font-size:inherit}.split-root{height:100vh;width:100vw;border:3px solid var(--border)}.split-panel{height:100%;overflow:hidden;background:var(--bg);display:flex;flex-direction:column}.panel-left,.panel-right{background:var(--bg)}.panel-middle{background:#fff}.split-handle{width:4px;background:var(--border);cursor:col-resize;position:relative}.split-handle:hover{background:#333}.panel-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;border-bottom:2px solid 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