/* Assignments Section Styles */
.assignments-container {
    max-width: 100%;
}

.assignments-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.assignments-filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
    flex: 1;
}

.assignments-filter-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.assignments-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 1.25rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.submissions-table-container {
    background: var(--bg-secondary);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.submissions-table-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.submissions-table-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.submissions-table-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Responsive Table Styles */
.submissions-table-wrapper {
    overflow-x: auto;
}

.submissions-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.submissions-table th {
    background: var(--bg-tertiary);
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
}

.submissions-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}

.submissions-table tr:last-child td {
    border-bottom: none;
}

.submissions-table tr:hover {
    background: var(--bg-tertiary);
}

.submission-paper {
    font-weight: 500;
    color: var(--text-primary);
}

.submission-course {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.submission-date {
    color: var(--text-secondary);
    white-space: nowrap;
}

.submission-score {
    font-weight: 600;
    text-align: center;
}

.submission-total-marks {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.submission-status {
    text-align: center;
}

.submission-actions {
    text-align: center;
    white-space: nowrap;
}

.submission-actions .btn {
    margin: 0.25rem;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}

/* Mobile Cards View */
.submissions-cards {
    display: none;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
}

.submission-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    transition: var(--transition);
}

.submission-card:hover {
    box-shadow: var(--shadow);
}

.submission-card-header {
    display: flex;
    justify-content: between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.submission-card-title {
    flex: 1;
    min-width: 200px;
}

.submission-card-paper {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.submission-card-course {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.submission-card-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.submission-card-info {
    text-align: center;
}

.submission-card-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.submission-card-value {
    font-weight: 600;
    font-size: 0.9rem;
}

.submission-card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.submission-card-actions .btn {
    flex: 1;
    min-width: 120px;
    justify-content: center;
}

.no-submissions {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.no-submissions i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
    display: block;
}

/* Pagination Styles */
.submissions-pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 1rem;
}

.pagination-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.pagination-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--primary);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-numbers {
    display: flex;
    gap: 0.25rem;
}

.pagination-number {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
    min-width: 40px;
    text-align: center;
}

.pagination-number:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary);
}

.pagination-number.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Submission Details Modal */
.submission-details-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.submission-details-content {
    background: var(--bg-secondary);
    border-radius: 12px;
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
}

.submission-details-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-primary);
    border-radius: 12px 12px 0 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.submission-details-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.submission-details-close:hover {
    background: var(--bg-tertiary);
}

.submission-details-body {
    padding: 1.5rem;
}

.submission-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.overview-item {
    text-align: center;
}

.overview-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.overview-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.overview-value.score {
    color: var(--success);
}

.overview-value.pending {
    color: var(--warning);
}

.questions-section {
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.questions-grid {
    display: grid;
    gap: 1rem;
}

.question-item {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    transition: var(--transition);
}

.question-item.correct {
    border-left: 4px solid var(--success);
}

.question-item.incorrect {
    border-left: 4px solid var(--error);
}

.question-item.essay {
    border-left: 4px solid var(--primary);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.question-number {
    font-weight: 600;
    color: var(--text-primary);
}

.question-marks {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.question-text {
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.answer-section {
    margin-bottom: 1rem;
}

.answer-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.answer-content {
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    border: 1px solid var(--border);
}

.correct-answer {
    color: var(--success);
    font-weight: 600;
}

.student-answer {
    color: var(--text-primary);
}

.student-answer.correct {
    color: var(--success);
    font-weight: 600;
}

.student-answer.incorrect {
    color: var(--error);
    font-weight: 600;
}

.essay-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.essay-action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    flex: 1;
    min-width: 200px;
    justify-content: center;
}

.essay-action-btn:hover {
    background: var(--primary-dark);
    text-decoration: none;
    color: white;
}

.essay-action-btn.outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.essay-action-btn.outline:hover {
    background: var(--primary-light);
}

.essay-action-btn:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
}

.essay-marks-info {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    border-left: 4px solid var(--primary);
}

.essay-marks-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.essay-marks-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
}

.marks-breakdown {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Loading states */
.submissions-loading {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.submissions-loading .spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-left: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

/* Responsive styles */
/* Responsive styles */
@media (max-width: 768px) {
    .assignments-filters {
        flex-direction: column;
    }
    
    .assignments-filter-group {
        min-width: 100%;
    }
    
    .submissions-table-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .submissions-table-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    /* Hide table on mobile, show cards */
    .submissions-table-wrapper {
        display: none !important;
    }
    
    .submissions-cards {
        display: flex !important;
    }
    
    .submission-card-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .submission-card-meta {
        width: 100%;
        justify-content: space-between;
    }
    
    .submission-card-actions {
        width: 100%;
    }
    
    .submissions-pagination {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .pagination-controls {
        justify-content: center;
    }
    
    .submission-overview {
        grid-template-columns: 1fr 1fr;
    }
    
    .essay-actions {
        flex-direction: column;
    }
    
    .essay-action-btn {
        min-width: 100%;
    }
}

/* Default: Show table, hide cards on desktop */
.submissions-table-wrapper {
    display: block;
}

.submissions-cards {
    display: none;
}

@media (max-width: 480px) {
    .submission-details-content {
        margin: 0.5rem;
        max-height: 95vh;
    }
    
    .submission-details-body {
        padding: 1rem;
    }
    
    .submission-overview {
        padding: 1rem;
        grid-template-columns: 1fr;
    }
    
    .submission-card-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .submission-card-info {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }
    
    .pagination-numbers {
        display: none;
    }
}