*{box-sizing:border-box}:root{--bg: #f6f7f9;--pane: #ffffff;--ink: #1c2430;--muted: #7a8494;--line: #e2e6ec;--accent: #2563eb;--accent-ink: #ffffff;--green: #16a34a;--amber: #b45309;--amber-bg: #fef3c7;--red: #dc2626;--home: #eef4ff}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--ink);font-size:15px}.app{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;gap:16px;padding:10px 18px;background:var(--pane);border-bottom:1px solid var(--line)}.topbar h1{font-size:18px;margin:0}.error-banner{background:#fee2e2;color:var(--red);padding:6px 12px;border-radius:6px;font-size:14px}.panes{display:grid;grid-template-columns:270px 320px 1fr;gap:14px;padding:14px;flex:1;overflow:hidden}.pane{background:var(--pane);border:1px solid var(--line);border-radius:10px;padding:14px;overflow-y:auto}.pane h2{font-size:15px;margin:0 0 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