:root{--primary: #111827;--secondary: #dc2626;--accent: #f59e0b;--bg: #f3f4f6;--white: #ffffff;--text: #1f2937;--success: #16a34a;--danger: #dc2626;--border: #e5e7eb;--muted: #6b7280;--sidebar-width: 250px;--radius: 10px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .06)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}button{font-family:inherit}.app-shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--primary);color:#fff;flex-shrink:0;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:50;transition:transform .25s ease;overflow-y:auto}.sidebar-brand{padding:20px 18px;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-brand h1{font-size:1.15rem;margin:0;letter-spacing:.5px;color:#fff}.sidebar-brand 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