:root{--bg: #0f172a;--panel: #ffffff;--panel-alt: #f1f5f9;--border: #d9e2ec;--text: #102a43;--muted: #627d98;--accent: #1f5f8b;--accent-dark: #14425f;--green: #157347;--red: #b02a37;--amber: #b7791f;--shadow: 0 1px 3px rgba(16, 42, 67, .12)}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:#eef2f6;color:var(--text);font-size:14px}a{color:var(--accent)}.app-shell{display:flex;min-height:100vh}.sidebar{width:230px;background:var(--bg);color:#cbd5e1;display:flex;flex-direction:column;padding:18px 12px;gap:4px;position:sticky;top:0;height:100vh}.sidebar .brand{color:#fff;font-weight:700;font-size:16px;padding:8px 10px 18px;letter-spacing:.3px}.sidebar a{color:#cbd5e1;text-decoration:none;padding:9px 12px;border-radius:8px;display:block;font-weight:500}.sidebar a.active,.sidebar a:hover{background:#ffffff1f;color:#fff}.sidebar 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