* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --primary-color: #2E5D9E;
            --secondary-color: #E63946;
            --accent-color: #F4A261;
            --light-color: #F8F9FA;
            --dark-color: #343A40;
            --success-color: #28A745;
            --warning-color: #FFC107;
            --info-color: #17A2B8;
        }

        body {
            background-color: #f5f7fa;
            color: var(--dark-color);
        }

        /* Header e Navegação */
        header {
            background: linear-gradient(135deg, var(--primary-color), #1a3a6e);
            color: white;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo i {
            font-size: 2rem;
        }

        .logo h1 {
            font-size: 1.8rem;
            font-weight: 700;
        }

        .logo span {
            color: var(--accent-color);
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }

        nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        nav a:hover, nav a.active {
            background-color: rgba(255, 255, 255, 0.2);
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .user-info i {
            font-size: 1.5rem;
        }

        /* Layout Principal */
        .container {
            display: flex;
            min-height: calc(100vh - 70px);
        }

        /* Sidebar */
        .sidebar {
            width: 250px;
            background-color: white;
            padding: 1.5rem 1rem;
            box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
        }

        .sidebar h3 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }

        .menu {
            list-style: none;
        }

        .menu li {
            margin-bottom: 0.5rem;
        }

        .menu a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0.8rem 1rem;
            color: var(--dark-color);
            text-decoration: none;
            border-radius: 6px;
            transition: all 0.3s ease;
        }

        .menu a:hover, .menu a.active {
            background-color: var(--primary-color);
            color: white;
        }

        .menu i {
            width: 20px;
            text-align: center;
        }

        /* Conteúdo Principal */
        .main-content {
            flex: 1;
            padding: 2rem;
            overflow-y: auto;
        }

        .page-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
        }

        .page-header h2 {
            color: var(--primary-color);
            font-size: 1.8rem;
        }

        .breadcrumb {
            color: #6c757d;
            font-size: 0.9rem;
        }

        /* Estatísticas */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }

        .stat-card {
            background-color: white;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            display: flex;
            align-items: center;
            gap: 1rem;
            transition: transform 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-5px);
        }

        .stat-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: white;
        }

        .stat-icon.students {
            background-color: var(--primary-color);
        }

        .stat-icon.teachers {
            background-color: var(--success-color);
        }

        .stat-icon.finance {
            background-color: var(--accent-color);
        }

        .stat-icon.classes {
            background-color: var(--info-color);
        }

        .stat-info h3 {
            font-size: 1.8rem;
            margin-bottom: 0.2rem;
        }

        .stat-info p {
            color: #6c757d;
            font-weight: 500;
        }

        /* Tabelas */
        .card {
            background-color: white;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            margin-bottom: 2rem;
        }

        .card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #eee;
        }

        .card-header h3 {
            color: var(--primary-color);
        }

        .btn {
            padding: 0.5rem 1.2rem;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }

        .btn-primary:hover {
            background-color: #1a3a6e;
        }

        .btn-success {
            background-color: var(--success-color);
            color: white;
        }

        .btn-warning {
            background-color: var(--warning-color);
            color: var(--dark-color);
        }

        .btn-sm {
            padding: 0.3rem 0.8rem;
            font-size: 0.9rem;
        }

        table {
            width: 100%;
            border-collapse: collapse;
        }

        thead {
            background-color: #f8f9fa;
        }

        th {
            padding: 1rem;
            text-align: left;
            font-weight: 600;
            color: var(--dark-color);
            border-bottom: 2px solid #eee;
        }

        td {
            padding: 1rem;
            border-bottom: 1px solid #eee;
        }

        tr:hover {
            background-color: #f8f9fa;
        }

        .status {
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .status.paid {
            background-color: rgba(40, 167, 69, 0.1);
            color: var(--success-color);
        }

        .status.pending {
            background-color: rgba(255, 193, 7, 0.1);
            color: var(--warning-color);
        }

        .status.overdue {
            background-color: rgba(230, 57, 70, 0.1);
            color: var(--secondary-color);
        }

        /* Formulários */
        .form-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .form-group {
            margin-bottom: 1.2rem;
        }

        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark-color);
        }

        input, select, textarea {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 1rem;
        }

        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(46, 93, 158, 0.1);
        }

        /* Sistema de Pagamentos */
        .payment-methods {
            display: flex;
            gap: 1rem;
            margin: 1.5rem 0;
        }

        .payment-method {
            flex: 1;
            border: 2px solid #ddd;
            border-radius: 8px;
            padding: 1.5rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .payment-method:hover, .payment-method.active {
            border-color: var(--primary-color);
            background-color: rgba(46, 93, 158, 0.05);
        }

        .payment-method i {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .emola { color: #FF6B00; }
        .mpesa { color: #00A859; }
        .visa { color: #1A1F71; }

        /* Footer */
        footer {
            background-color: var(--dark-color);
            color: white;
            text-align: center;
            padding: 1.5rem;
            margin-top: 2rem;
        }

        /* Responsividade */
        @media (max-width: 1024px) {
            .sidebar {
                width: 200px;
            }
        }

        @media (max-width: 768px) {
            .container {
                flex-direction: column;
            }
            
            .sidebar {
                width: 100%;
                padding: 1rem;
            }
            
            .menu {
                display: flex;
                flex-wrap: wrap;
                gap: 0.5rem;
            }
            
            .menu li {
                flex: 1 1 calc(50% - 0.5rem);
            }
            
            header {
                flex-direction: column;
                gap: 1rem;
                padding: 1rem;
            }
            
            nav ul {
                flex-wrap: wrap;
                justify-content: center;
            }
        }