/* Course Performance Section Styles */
.course-performance-section {
    padding: 1rem 0;
}

/* Performance Filters */
.course-performance-filters {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: flex-end;
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.course-performance-filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex: 1;
    min-width: 200px;
}

.course-performance-filter-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-performance-filters .form-select {
    background-color: var(--bg-primary);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: var(--transition);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 16px;
}

.course-performance-filters .form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.course-performance-filters .form-select:hover {
    border-color: var(--primary);
}

/* Performance Summary Cards */
.course-performance-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.course-performance-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

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

.course-performance-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.course-performance-card-icon {
    width: 70px;
    height: 70px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.course-performance-card-icon.score {
    background: linear-gradient(135deg, #2196F3, #1976D2);
}

.course-performance-card-icon.average {
    background: linear-gradient(135deg, #4CAF50, #2E7D32);
}

.course-performance-card-icon.rank {
    background: linear-gradient(135deg, #FF9800, #EF6C00);
}

.course-performance-card-icon.progress {
    background: linear-gradient(135deg, #9C27B0, #7B1FA2);
}

.course-performance-card-content {
    flex: 1;
}

.course-performance-card-value {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    line-height: 1;
}

.course-performance-card-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.course-performance-card-trend {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    background-color: var(--bg-tertiary);
    width: fit-content;
}

/* Rank Comparison Cards */
.rank-comparison-section {
    margin-bottom: 2rem;
}

.rank-comparison-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.rank-comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.rank-comparison-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.rank-comparison-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.rank-comparison-card.first::before {
    background: linear-gradient(90deg, #FFD700, #FFA500);
}

.rank-comparison-card.second::before {
    background: linear-gradient(90deg, #C0C0C0, #A0A0A0);
}

.rank-comparison-card.third::before {
    background: linear-gradient(90deg, #CD7F32, #8B4513);
}

.rank-comparison-card.user-top::before {
    background: linear-gradient(90deg, #4CAF50, #2E7D32);
}

.rank-comparison-header {
    margin-bottom: 1rem;
}

.rank-position {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.rank-comparison-card.first .rank-position {
    color: #FFD700;
}

.rank-comparison-card.second .rank-position {
    color: #C0C0C0;
}

.rank-comparison-card.third .rank-position {
    color: #CD7F32;
}

.rank-comparison-card.user-top .rank-position {
    color: #4CAF50;
}

.rank-student-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.rank-student-school {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.rank-score-comparison {
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.rank-score {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.rank-comparison-card.first .rank-score {
    color: #FFD700;
}

.rank-comparison-card.second .rank-score {
    color: #C0C0C0;
}

.rank-comparison-card.third .rank-score {
    color: #CD7F32;
}

.rank-comparison-card.user-top .rank-score {
    color: #4CAF50;
}

.rank-target {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.rank-target-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
}

.rank-user-status {
    padding: 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.rank-user-status.achieved {
    background-color: rgba(76, 175, 80, 0.1);
    color: #4CAF50;
}

.rank-user-status.target {
    background-color: rgba(33, 150, 243, 0.1);
    color: #2196F3;
}

/* Performance Chart Container */
.course-performance-chart-container {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.course-performance-chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.course-performance-chart-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.course-performance-chart-controls {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.course-chart-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.course-legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: var(--transition);
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    user-select: none;
    cursor: pointer !important;
    pointer-events: all !important;
}

.course-legend-item:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-1px);
}

.course-legend-item.active {
    opacity: 1;
    background-color: var(--primary-light);
    border-color: var(--primary);
}

.course-legend-item.disabled {
    opacity: 0.5;
}

.course-legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.course-legend-score {
    background-color: #2196F3;
}

.course-legend-average {
    background-color: #4CAF50;
}

.course-legend-rank {
    background-color: #FF9800;
}

.course-legend-improvement {
    background-color: #9C27B0;
}

.course-legend-mcq {
    background-color: #00BCD4;
}

.course-legend-essay {
    background-color: #E91E63;
}

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

.course-chart-wrapper {
    position: relative;
    background-color: var(--bg-primary);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.course-performance-chart {
    width: 100%;
    height: 400px;
    position: relative;
    overflow: hidden;
}

.course-chart-loading, .course-chart-error {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-secondary);
    flex-direction: column;
    gap: 1rem;
    text-align: center;
    padding: 2rem;
}

.course-chart-error {
    color: var(--error);
}

.course-chart-error i {
    font-size: 3rem;
    opacity: 0.7;
}

.course-chart-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border);
}

.course-nav-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.course-nav-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.course-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.course-nav-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Rankings Table */
.course-rankings-table-container {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.course-rankings-table-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-rankings-table-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
}

.course-rankings-table {
    width: 100%;
}

.course-rankings-table-row {
    display: grid;
    grid-template-columns: 2fr 120px 80px 100px 100px 100px 100px 100px;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
    align-items: center;
    min-height: 70px;
}

.course-rankings-table-row.header {
    background-color: var(--bg-tertiary);
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-rankings-table-row:not(.header):hover {
    background-color: var(--bg-tertiary);
}

.course-ranking-paper {
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.course-ranking-date {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.course-ranking-score, .course-ranking-mcq, .course-ranking-essay {
    text-align: center;
    font-weight: 700;
    font-size: 1rem;
}

.course-ranking-score {
    color: var(--primary);
}

.course-ranking-mcq {
    color: #00BCD4;
}

.course-ranking-essay {
    color: #E91E63;
}

.course-ranking-overall, .course-ranking-class {
    text-align: center;
    font-weight: 700;
    font-size: 1rem;
}

.course-ranking-overall {
    color: var(--warning);
}

.course-ranking-class {
    color: var(--info);
}

.course-ranking-improvement {
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    width: fit-content;
    margin: 0 auto;
}

.course-ranking-improvement.trend-up {
    background-color: rgba(76, 175, 80, 0.1);
    color: #4CAF50;
}

.course-ranking-improvement.trend-down {
    background-color: rgba(244, 67, 54, 0.1);
    color: #F44336;
}

/* Pagination */
.course-rankings-pagination {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border);
    background-color: var(--bg-tertiary);
    flex-wrap: wrap;
    gap: 1rem;
}

.course-pagination-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.course-pagination-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.course-pagination-btn {
    padding: 0.75rem 1.25rem;
    border: 2px solid var(--border);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-pagination-btn:hover:not(:disabled) {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
}

.course-pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.course-pagination-numbers {
    display: flex;
    gap: 0.5rem;
}

.course-pagination-number {
    min-width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--border);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 600;
}

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

.course-pagination-number:hover:not(.active) {
    background-color: var(--bg-tertiary);
    border-color: var(--primary);
}

/* Loading States */
.course-performance-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    text-align: center;
    flex-direction: column;
    gap: 1.5rem;
}

.course-no-data {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-style: italic;
}

.course-performance-error {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    border-radius: 16px;
    border: 2px solid rgba(244, 67, 54, 0.2);
}

.course-performance-error i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--error);
}

.course-performance-error h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

.course-no-submissions {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-style: italic;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    border: 2px dashed var(--border);
}

.course-no-submissions i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
    display: block;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .course-rankings-table-row {
        grid-template-columns: 1.5fr 100px 80px 80px 80px 80px 80px 80px;
        gap: 0.75rem;
        padding: 1rem 1.25rem;
    }
}

@media (max-width: 1024px) {
    .course-performance-summary {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .rank-comparison-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .course-performance-filters {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .course-performance-filter-group {
        min-width: 100%;
    }
    
    .course-performance-summary {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .course-performance-card {
        padding: 1.25rem;
        gap: 1rem;
    }
    
    .course-performance-card-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .course-performance-card-value {
        font-size: 1.75rem;
    }
    
    .rank-comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .course-performance-chart-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .course-performance-chart-controls {
        justify-content: center;
    }
    
    .course-chart-legend {
        justify-content: center;
    }
    
    .course-chart-actions {
        justify-content: center;
        width: 100%;
    }
    
    .course-performance-chart {
        height: 350px;
    }
    
    .course-rankings-table-row {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        padding: 1rem;
        text-align: center;
        background-color: var(--bg-primary);
        border-radius: 12px;
        margin-bottom: 0.75rem;
        border: 1px solid var(--border);
    }
    
    .course-rankings-table-row.header {
        display: none;
    }
    
    .course-ranking-item {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
        padding: 0.75rem;
    }
    
    .course-ranking-paper {
        grid-column: 1 / -1;
        font-weight: 700;
        font-size: 1rem;
        margin-bottom: 0.5rem;
        text-align: center;
    }
    
    .course-ranking-date::before {
        content: "Date: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-ranking-score::before {
        content: "Score: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-ranking-mcq::before {
        content: "MCQ: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-ranking-essay::before {
        content: "Essay: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-ranking-overall::before {
        content: "Overall Rank: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-ranking-class::before {
        content: "Class Rank: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-ranking-improvement::before {
        content: "Improvement: ";
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .course-rankings-pagination {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        text-align: center;
    }
    
    .course-pagination-controls {
        flex-direction: column;
        width: 100%;
    }
    
    .course-pagination-numbers {
        order: -1;
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .course-performance-section {
        padding: 0.5rem 0;
    }
    
    .course-performance-filters {
        padding: 1rem;
    }
    
    .course-performance-chart-container {
        padding: 1rem;
    }
    
    .course-performance-chart {
        height: 300px;
    }
    
    .course-chart-legend {
        flex-direction: column;
        width: 100%;
    }
    
    .course-legend-item {
        justify-content: center;
    }
    
    .course-performance-card {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem 1rem;
    }
    
    .course-performance-card-trend {
        margin: 0 auto;
    }
    
    .course-rankings-table-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
}

/* Dark mode specific adjustments */
.dark-mode .course-performance-card {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(255, 255, 255, 0.05));
}

.dark-mode .course-performance-chart {
    background-color: rgba(0, 0, 0, 0.2);
}

.dark-mode .course-rankings-table-row:not(.header):hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.dark-mode .course-chart-legend {
    color: var(--text-primary);
}

.dark-mode .course-performance-chart-header {
    color: var(--text-primary);
}