/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
}

/* Card Styles */
.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

/* Button Styles */
.btn {
    border-radius: 0.375rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
}

/* Badge Styles */
.badge {
    font-size: 0.75em;
    font-weight: 500;
}

/* Progress Bar Styles */
.progress {
    height: 10px;
    border-radius: 5px;
    background-color: #e9ecef;
}

.progress-bar {
    border-radius: 5px;
    transition: width 0.6s ease;
}

/* Form Styles */
.form-control {
    border-radius: 0.375rem;
    border: 1px solid #ced4da;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-select {
    border-radius: 0.375rem;
    border: 1px solid #ced4da;
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

/* Table Styles */
.table {
    border-radius: 0.375rem;
    overflow: hidden;
}

.table th {
    background-color: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.025);
}

/* Alert Styles */
.alert {
    border-radius: 0.375rem;
    border: none;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #d1edcc;
    color: #0f5132;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
}

/* Statistics Cards */
.stats-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.stats-card h3 {
    margin-bottom: 0;
    font-size: 2rem;
    font-weight: bold;
}

.stats-card p {
    margin-bottom: 0;
    opacity: 0.9;
}

/* Question Display */
.question-card {
    background: #ffffff;
    border: 1px solid #e9ecef;
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.question-text {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: #495057;
}

.choice-list {
    list-style: none;
    padding: 0;
}

.choice-item {
    padding: 0.5rem 1rem;
    margin-bottom: 0.5rem;
    background: #f8f9fa;
    border-radius: 0.375rem;
    border-left: 4px solid #dee2e6;
}

.choice-item.correct {
    background: #d1edcc;
    border-left-color: #198754;
    color: #0f5132;
}

.choice-item.correct::before {
    content: "✓ ";
    font-weight: bold;
}

/* Difficulty and Objective Badges */
.difficulty-simple {
    background-color: #198754;
}

.difficulty-difficult {
    background-color: #dc3545;
}

.objective-reminding {
    background-color: #0dcaf0;
}

.objective-understanding {
    background-color: #ffc107;
    color: #000;
}

.objective-creativity {
    background-color: #6f42c1;
}

/* Exam Generation Form */
.exam-form {
    background: #ffffff;
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #e9ecef;
}

.form-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.form-section h4 {
    color: #495057;
    margin-bottom: 1rem;
}

/* Loading Spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .alert,
    .btn,
    .card-footer {
        display: none !important;
    }
    
    .card {
        border: 1px solid #000 !important;
        box-shadow: none !important;
    }
    
    .question-card {
        page-break-inside: avoid;
        margin-bottom: 1rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}