* { box-sizing: border-box; }
body { margin: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: #f0f2f5; display: flex; height: 100vh; overflow: hidden; }
.sidebar { width: 250px; background: #2c3e50; color: #ecf0f1; display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-header { padding: 20px; font-size: 24px; font-weight: bold; text-align: center; border-bottom: 1px solid #34495e; background: #1a252f; }
.sidebar-menu { padding: 20px 0; flex: 1; }
.sidebar-menu a { display: block; padding: 15px 25px; color: #bdc3c7; text-decoration: none; transition: 0.3s; }
.sidebar-menu a:hover, .sidebar-menu a.active { background: #34495e; color: #fff; border-left: 4px solid #3498db; }
.main-content { flex: 1; padding: 30px; overflow-y: auto; }
.card { background: #fff; padding: 25px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); margin-bottom: 25px; }
.page-title { margin-top: 0; margin-bottom: 25px; color: #2c3e50; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-control { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }
.btn { padding: 10px 20px; border: none; border-radius: 4px; cursor: pointer; font-size: 14px; text-decoration: none; display: inline-block; }
.btn-primary { background: #3498db; color: #fff; }
.btn-danger { background: #e74c3c; color: #fff; }
.btn-success { background: #2ecc71; color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
table { width: 100%; border-collapse: collapse; margin-top: 15px; }
th, td { padding: 12px 15px; text-align: left; border-bottom: 1px solid #ddd; }
th { background-color: #f8f9fa; color: #2c3e50; }
.status-badge { padding: 4px 8px; border-radius: 12px; font-size: 11px; font-weight: bold; }
.status-active { background: #e8f8f5; color: #2ecc71; }
.status-maint { background: #fdedec; color: #e74c3c; }
.code-box { font-family: monospace; background: #f4f4f4; padding: 4px; border-radius: 3px; color: #c0392b; }