/* Courses Section Styles */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.course-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
    border-left-color: var(--primary-dark);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
}

.course-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.course-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.course-card-badge {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-card-badge.free {
    background: linear-gradient(135deg, var(--success), var(--success-dark));
}

.course-card-details {
    margin-bottom: 1.5rem;
}

.course-card-detail {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.course-card-detail i {
    margin-right: 0.75rem;
    width: 16px;
    text-align: center;
    color: var(--primary);
}

.course-card-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
}

.course-stat {
    text-align: center;
}

.course-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.course-stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-card-actions {
    display: flex;
    gap: 0.75rem;
}

.course-card-action {
    flex: 1;
    text-align: center;
}

/* No Courses Message */
.no-courses-message {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    border-radius: 12px;
    border: 2px dashed var(--border);
}

.no-courses-message i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.5;
    display: block;
    color: var(--primary);
}

.no-courses-message h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.no-courses-message p {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Course Papers Section */
.course-papers-section {
    animation: fadeIn 0.3s ease-in-out;
}

.course-papers-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border);
}

.course-papers-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

/* Enhanced Paper Cards for Courses */
.course-paper-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary);
    position: relative;
    overflow: hidden;
}

.course-paper-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.course-paper-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.course-paper-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.course-paper-card-subject {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-paper-card-number {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    padding: 0.4rem 0.8rem;
    border-radius: 12px;
    font-weight: 600;
}

.course-paper-card-details {
    margin-bottom: 1.5rem;
}

.course-paper-card-detail {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.course-paper-card-detail i {
    margin-right: 0.5rem;
    width: 16px;
    text-align: center;
    color: var(--primary);
}

.course-paper-card-timer {
    background: linear-gradient(135deg, var(--warning), var(--warning-dark));
    color: white;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 1rem;
    animation: pulse 2s infinite;
}

.course-paper-card-timer.urgent {
    background: linear-gradient(135deg, var(--error), var(--error-dark));
    animation: pulse 1s infinite;
}

.course-paper-card-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.course-paper-card-downloads {
    display: flex;
    gap: 0.5rem;
}

.course-paper-card-downloads .course-paper-card-action {
    flex: 1;
}

.course-paper-card-action {
    min-width: 120px;
    text-align: center;
}

/* Loading States */
.courses-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    text-align: center;
    background-color: var(--bg-secondary);
    border-radius: 12px;
}

.courses-loading .spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-left: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .course-card-stats {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .course-card-actions {
        flex-direction: column;
    }
    
    .course-papers-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .course-paper-card-downloads {
        flex-direction: column;
    }
    
    .course-paper-card-action {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .course-card {
        padding: 1rem;
    }
    
    .course-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .course-card-badge {
        align-self: flex-start;
    }
    
    .course-paper-card {
        padding: 1rem;
    }
    
    .course-paper-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Status Indicators */
.course-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-status.active {
    background-color: var(--success-light);
    color: var(--success-dark);
}

.course-status.pending {
    background-color: var(--warning-light);
    color: var(--warning-dark);
}

.course-status.inactive {
    background-color: var(--error-light);
    color: var(--error-dark);
}

/* Progress Bar */
.course-progress {
    margin-top: 1rem;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.progress-bar {
    height: 6px;
    background-color: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Smooth Transitions */
.courses-grid,
.course-papers-section {
    transition: all 0.3s ease-in-out;
}

.course-papers-section {
    opacity: 0;
    transform: translateY(20px);
}

.course-papers-section[style*="display: block"] {
    opacity: 1;
    transform: translateY(0);
}

/* Debug Styles */
.debug-info {
    background: #f8f9fa;
    border-left: 4px solid #007bff;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
}

.debug-info.error {
    border-left-color: #dc3545;
    background: #f8d7da;
}

.debug-info.success {
    border-left-color: #28a745;
    background: #d4edda;
}