* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.menu-btn {
    display: block;
    padding: 30px;
    background: white;
    border-radius: 10px;
    text-decoration: none;
    color: #333;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.menu-btn:hover {
    transform: translateY(-5px);
    background: #007bff;
    color: white;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    margin: 5px;
}

.btn.delete {
    background: #dc3545;
}

.btn:hover {
    opacity: 0.8;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: white;
}

table th, table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    background: #f8f9fa;
    font-weight: bold;
}

.search-form {
    margin: 20px 0;
}

.search-form input {
    padding: 10px;
    width: 300px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.search-form button {
    padding: 10px 20px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.pagination {
    margin: 20px 0;
}

.pagination a {
    padding: 8px 16px;
    margin: 0 4px;
    border: 1px solid #ddd;
    text-decoration: none;
    color: #007bff;
}

.pagination a.active {
    background: #007bff;
    color: white;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.message {
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-section, .list-section {
    background: white;
    padding: 20px;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.menu-btn h2 {
    margin-bottom: 10px;
}

.menu-btn p {
    color: #666;
    font-size: 0.9em;
}

/* Additional styles for better UI */
.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 2em;
    font-weight: bold;
    color: #007bff;
}

.stat-label {
    color: #666;
    margin-top: 5px;
}

/* Print styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    .btn {
        display: none !important;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    table {
        font-size: 0.9em;
    }
    
    .menu-grid {
        grid-template-columns: 1fr;
    }
    
    .search-form input {
        width: 100%;
        margin-bottom: 10px;
    }
}

/* Admin Dashboard Styles */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.user-info {
    text-align: right;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 30px;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

/* Bulk Operations */
.bulk-section {
    background: white;
    padding: 20px;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.student-selector {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    margin: 10px 0;
}

.student-item {
    padding: 5px;
    border-bottom: 1px solid #eee;
}

.select-all {
    margin-bottom: 10px;
    font-weight: bold;
}

/* Role-based styling */
.role-admin { color: #dc3545; font-weight: bold; }
.role-manager { color: #fd7e14; font-weight: bold; }
.role-viewer { color: #20c997; font-weight: bold; }

/* Responsive improvements */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        text-align: center;
    }
    
    .user-info {
        text-align: center;
        margin-top: 10px;
    }
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
}