.app{min-height:100vh;display:flex;flex-direction:column}.navbar{background-color:#2c3e50;color:#fff;padding:0;box-shadow:0 2px 4px #0000001a}.nav-container{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center}.nav-logo{font-size:24px;font-weight:700;padding:20px 0}.nav-menu{display:flex;list-style:none;gap:10px}.nav-link{color:#fff;text-decoration:none;padding:10px 15px;border-radius:4px;transition:background-color .3s}.nav-link:hover{background-color:#34495e}.main-content{flex:1;padding:20px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft JhengHei,sans-serif;background-color:#f5f5f5;color:#333}#root{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:20px}.card{background:#fff;border-radius:8px;padding:20px;margin-bottom:20px;box-shadow:0 2px 4px #0000001a}.card-title{font-size:20px;font-weight:700;margin-bottom:15px;color:#2c3e50}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:500;color:#555}.form-group input,.form-group select{width:100%;padding:10px;border:1px solid #ddd;border-radius:4px;font-size:14px}.form-group input:focus,.form-group select:focus{outline:none;border-color:#3498db}.btn{padding:10px 20px;border:none;border-radius:4px;font-size:14px;cursor:pointer;transition:background-color .3s}.btn-primary{background-color:#3498db;color:#fff}.btn-primary:hover{background-color:#2980b9}.btn-success{background-color:#27ae60;color:#fff}.btn-success:hover{background-color:#229954}.btn-danger{background-color:#e74c3c;color:#fff}.btn-danger:hover{background-color:#c0392b}.table{width:100%;border-collapse:collapse;margin-top:20px}.table th,.table td{padding:12px;text-align:left;border-bottom:1px solid #ddd}.table th{background-color:#f8f9fa;font-weight:600;color:#2c3e50}.table tr:hover{background-color:#f8f9fa}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-bottom:20px}.stat-card{background:#fff;border-radius:8px;padding:20px;box-shadow:0 2px 4px #0000001a}.stat-label{font-size:14px;color:#7f8c8d;margin-bottom:10px}.stat-value{font-size:28px;font-weight:700;color:#2c3e50}.stat-value.positive{color:#27ae60}.stat-value.negative{color:#e74c3c}