:root{--bg: #f1f5f9;--surface: #ffffff;--border: #e2e8f0;--text: #0f172a;--muted: #64748b;--primary: #4f46e5;--primary-dark: #4338ca;--green: #16a34a;--orange: #f59e0b;--red: #dc2626;--blue: #3b82f6;--shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 1px 2px rgba(15, 23, 42, .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}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app-shell{display:flex;min-height:100vh}.sidebar{width:240px;background:#0f172a;color:#cbd5e1;display:flex;flex-direction:column;padding:20px 0;position:sticky;top:0;height:100vh}.sidebar .brand{padding:0 22px 18px;font-size:17px;font-weight:700;color:#fff;line-height:1.3}.sidebar .brand span{color:#818cf8}.sidebar nav{display:flex;flex-direction:column;gap:2px;padding:0 12px}.sidebar nav a{color:#cbd5e1;padding:10px 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