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

:root {
    --primary-color: #3B82F6;
    --primary-light: #60A5FA;
    --primary-dark: #1D4ED8;
    --secondary-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --info-color: #3B82F6;
    --bg-color: #F0F9FF;
    --card-bg: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border-color: #E0F2FE;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    outline: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-success {
    background: linear-gradient(135deg, var(--secondary-color), #34D399);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), #FBBF24);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #F87171);
    color: white;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
    background: var(--card-bg);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group .hint {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-muted);
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
}

.input-group .btn {
    white-space: nowrap;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.charts-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

@media (max-width: 1200px) {
    .charts-row {
        grid-template-columns: 1fr;
    }
}

.warning-list-container {
    height: 300px;
    overflow: hidden;
    position: relative;
}

.warning-list {
    display: flex;
    flex-direction: column;
    animation: scrollUp 30s linear infinite;
}

@keyframes scrollUp {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(-50%);
    }
}

.warning-list:hover {
    animation-play-state: paused;
}

.warning-item {
    display: flex;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
}

.warning-item:last-child {
    border-bottom: none;
}

.warning-avatar {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #333;
    border-radius: 50%;
    color: white;
    font-size: 16px;
    flex-shrink: 0;
}

.warning-student {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 80px;
}

.warning-class {
    color: var(--text-secondary);
    font-size: 14px;
}

.warning-content {
    flex: 1;
    color: var(--danger-color, #EF4444);
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.category-ranking {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-color);
    border-radius: 8px;
}

.category-rank {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 600;
    font-size: 14px;
    color: white;
    flex-shrink: 0;
}

.category-item:nth-child(1) .category-rank {
    background: #EF4444;
}

.category-item:nth-child(2) .category-rank {
    background: #F59E0B;
}

.category-item:nth-child(3) .category-rank {
    background: #10B981;
}

.category-item:nth-child(n+4) .category-rank {
    background: #6B7280;
}

.category-name {
    flex: 1;
    font-weight: 500;
}

.category-score {
    font-weight: 600;
    color: var(--danger-color, #EF4444);
}

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

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th,
table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

table th {
    background: var(--bg-color);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

table tr:hover {
    background: var(--bg-color);
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}

.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.pagination button:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

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

.search-box {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-box input,
.search-box select {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    min-width: 200px;
}

.search-box .btn {
    white-space: nowrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-primary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay.active ~ .modal-overlay {
    z-index: 1001;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: 32px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal::-webkit-scrollbar {
    display: none;
}

.modal.large {
    max-width: 900px;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border-color);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    background: var(--card-bg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 10000;
    transform: translateX(120%);
    transition: var(--transition);
}

.toast.active {
    transform: translateX(0);
}

.toast-success {
    border-left: 4px solid var(--secondary-color);
}

.toast-error {
    border-left: 4px solid var(--danger-color);
}

.toast-warning {
    border-left: 4px solid var(--warning-color);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 16px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-card .icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
}

.stat-card .icon.primary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
}

.stat-card .icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
}

.stat-card .icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.stat-card .icon.danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.stat-card .value {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 8px;
}

.stat-card .label {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.chart-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.chart-container .chart {
    height: 300px;
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.tabs .tab-btn {
    padding: 10px 20px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.tabs .tab-btn:hover {
    background: var(--bg-color);
}

.tabs .tab-btn.active {
    background: var(--primary-color);
    color: white;
}

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

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

@media (max-width: 768px) {
    .search-box {
        flex-direction: column;
    }
    
    .search-box input,
    .search-box select {
        min-width: 100%;
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .modal {
        padding: 20px;
        margin: 20px;
        max-height: 85vh;
        overflow-y: auto;
    }
    
    .modal.large {
        max-width: 95%;
        margin: 10px;
        padding: 16px;
    }
    
    body {
        font-size: 13px;
    }
    
    .card {
        padding: 16px;
        margin-bottom: 16px;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .charts-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .table-container {
        overflow-x: auto;
        margin: 0 -16px;
        padding: 0 16px;
    }
    
    table {
        min-width: 500px;
    }
    
    table th,
    table td {
        padding: 10px 8px;
        font-size: 13px;
        white-space: nowrap;
    }
    
    .chart-container {
        padding: 16px;
    }
    
    .chart-container .chart {
        height: 250px;
    }
    
    .tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 8px;
    }
    
    .tabs .tab-btn {
        padding: 8px 14px;
        font-size: 13px;
        flex-shrink: 0;
    }
    
    .pagination {
        flex-direction: column;
        gap: 10px;
    }
    
    .stat-card {
        padding: 16px;
    }
    
    .stat-card .value {
        font-size: 24px;
    }
    
    .stat-card .icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
    
    .warning-list-container {
        height: 250px;
    }
    
    .category-ranking {
        gap: 10px;
    }
    
    .category-item {
        padding: 10px;
    }
    
    .form-group {
        margin-bottom: 16px;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 10px 12px;
        font-size: 14px;
    }
    
    .btn {
        padding: 10px 16px;
    }
    
    .btn-sm {
        padding: 6px 10px;
        font-size: 12px;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .page-actions {
        width: 100%;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .page-actions .btn {
        flex: 1;
        min-width: calc(50% - 4px);
    }
    
    .page-actions .btn i {
        margin-right: 4px;
    }
    
    .page-title {
        font-size: 20px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group .btn {
        width: 100%;
    }
    
    select {
        font-size: 14px;
        padding: 10px 12px;
        -webkit-appearance: none;
        appearance: none;
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
        background-repeat: no-repeat;
        background-position: right 12px center;
        padding-right: 36px;
    }
    
    input[type="text"],
    input[type="search"],
    input[type="file"],
    input[type="number"],
    input[type="password"],
    input[type="tel"],
    input[type="email"] {
        font-size: 14px;
        padding: 10px 12px;
    }
    
    .badge {
        padding: 3px 8px;
        font-size: 11px;
    }
    
    .empty-state {
        padding: 40px 20px;
    }
    
    .empty-state i {
        font-size: 36px;
    }
    
    .toast {
        right: 10px;
        left: 10px;
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 13px;
    }
    
    body {
        font-size: 13px;
        overflow-x: hidden;
    }
    
    .stats-grid {
        gap: 10px;
    }
    
    .stat-card {
        padding: 12px;
    }
    
    .stat-card .value {
        font-size: 20px;
    }
    
    .stat-card .label {
        font-size: 12px;
    }
    
    .card {
        padding: 12px;
    }
    
    .card-title {
        font-size: 16px;
    }
    
    .chart-container .chart {
        height: 200px;
    }
    
    .table-container {
        margin: 0 -12px;
        padding: 0 12px;
    }
    
    table th,
    table td {
        padding: 8px 6px;
        font-size: 12px;
    }
    
    .tabs .tab-btn {
        padding: 6px 10px;
        font-size: 12px;
    }
    
    .badge {
        padding: 3px 8px;
        font-size: 11px;
    }
    
    .modal {
        padding: 16px;
        width: 95%;
        margin: 8px;
    }
    
    .btn {
        padding: 8px 12px;
        font-size: 12px;
    }
    
    .btn-sm {
        padding: 5px 8px;
        font-size: 11px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group input {
        width: 100%;
    }
    
    .input-group .btn {
        width: 100%;
    }
    
    .warning-list-container {
        height: 200px;
    }
    
    .warning-item {
        padding: 10px 0;
        gap: 10px;
    }
    
    .warning-avatar {
        width: 28px;
        height: 28px;
        font-size: 14px;
    }
    
    .warning-student {
        min-width: 60px;
    }
    
    .warning-content {
        font-size: 12px;
    }
    
    .category-item {
        padding: 8px;
    }
    
    .category-rank {
        width: 24px;
        height: 24px;
        font-size: 12px;
    }
    
    .category-name {
        font-size: 13px;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 8px 10px;
        font-size: 13px;
    }
    
    .pagination button {
        padding: 6px 10px;
        font-size: 12px;
    }
    
    .page-header {
        gap: 10px;
    }
    
    .page-title {
        font-size: 18px;
    }
    
    .page-actions {
        gap: 6px;
    }
    
    .page-actions .btn {
        flex: 1;
        min-width: calc(50% - 3px);
        padding: 8px 8px;
        font-size: 12px;
    }
    
    .search-box {
        gap: 8px;
    }
    
    .search-box input,
    .search-box select {
        padding: 8px 10px;
        font-size: 13px;
    }
    
    .search-box .btn {
        padding: 8px 12px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    
    .stat-card {
        padding: 10px;
    }
    
    .stat-card .value {
        font-size: 18px;
    }
    
    .stat-card .label {
        font-size: 11px;
    }
    
    .stat-card .icon {
        width: 32px;
        height: 32px;
        font-size: 16px;
        margin-bottom: 8px;
    }
    
    .charts-row {
        gap: 10px;
    }
    
    .chart-container {
        padding: 10px;
    }
    
    .chart-container .chart {
        height: 180px;
    }
    
    .card-header {
        margin-bottom: 12px;
        padding-bottom: 10px;
    }
    
    .card-title {
        font-size: 15px;
    }
    
    .form-group {
        margin-bottom: 12px;
    }
    
    .form-group label {
        font-size: 13px;
        margin-bottom: 6px;
    }
    
    select {
        padding: 8px 30px 8px 10px;
        font-size: 13px;
    }
    
    input[type="text"],
    input[type="search"],
    input[type="file"],
    input[type="number"] {
        padding: 8px 10px;
        font-size: 13px;
    }
    
    .toast {
        right: 8px;
        left: 8px;
        padding: 10px 14px;
        font-size: 13px;
    }
    
    .empty-state {
        padding: 30px 15px;
    }
    
    .empty-state i {
        font-size: 32px;
    }
    
    .empty-state p {
        font-size: 14px;
    }
}

@media (max-width: 360px) {
    :root {
        font-size: 12px;
    }
    
    .stat-card .value {
        font-size: 18px;
    }
    
    .card {
        padding: 10px;
    }
    
    .chart-container .chart {
        height: 180px;
    }
    
    .modal {
        padding: 12px;
        margin: 10px;
    }
}