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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: #f5f7fa;
    color: #333;
}

.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 450px;
    padding: 40px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 24px;
    color: #333;
    margin-bottom: 10px;
}

.login-header p {
    color: #999;
    font-size: 14px;
}

.login-tabs {
    display: flex;
    border-bottom: 2px solid #e5e7eb;
    margin-bottom: 30px;
}

.login-tabs .tab {
    flex: 1;
    text-align: center;
    padding: 12px;
    cursor: pointer;
    color: #666;
    font-size: 14px;
    transition: all 0.3s;
}

.login-tabs .tab.active {
    color: #667eea;
    border-bottom: 2px solid #667eea;
    margin-bottom: -2px;
}

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

.login-form label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
    font-weight: 500;
}

.login-form .input-wrapper {
    position: relative;
}

.login-form .input-wrapper i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
}

.login-form input,
.login-form textarea {
    width: 100%;
    padding: 12px 12px 12px 40px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.login-form textarea {
    padding: 12px;
}

.login-form input:focus,
.login-form textarea:focus {
    outline: none;
    border-color: #667eea;
}

.hidden {
    display: none !important;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
    justify-content: center;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e5e7eb;
    color: #333;
}

.btn-secondary:hover {
    background: #d1d5db;
}

.btn-success {
    background: #10b981;
    color: white;
}

.btn-success:hover {
    background: #059669;
}

.btn-danger {
    background: #ef4444;
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

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

.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background: #1f2937;
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid #374151;
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.sidebar-nav {
    flex: 1;
    padding: 10px 0;
}

.sidebar-nav .nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: #9ca3af;
    text-decoration: none;
    transition: all 0.3s;
    gap: 12px;
}

.sidebar-nav .nav-item:hover {
    background: #374151;
    color: white;
}

.sidebar-nav .nav-item.active {
    background: #667eea;
    color: white;
}

.sidebar-nav .nav-item i {
    font-size: 18px;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid #374151;
}

.user-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: #9ca3af;
}

.btn-logout {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 5px;
    transition: color 0.3s;
}

.btn-logout:hover {
    color: white;
}

.main-content {
    flex: 1;
    margin-left: 240px;
    display: flex;
    flex-direction: column;
}

.header {
    background: white;
    padding: 20px 30px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
    color: #1f2937;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.content {
    padding: 30px;
    flex: 1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.stat-icon i {
    font-size: 24px;
}

.stat-content h3 {
    font-size: 28px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 5px;
}

.stat-content p {
    color: #6b7280;
    font-size: 14px;
}

.charts-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.chart-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.chart-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 15px;
}

.chart-container {
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #9ca3af;
}

.top-videos-section {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.top-videos-section h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 15px;
}

.filter-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.form-control {
    padding: 10px 15px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
}

.table-container {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

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

.data-table thead {
    background: #f9fafb;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}

.data-table th {
    font-weight: 600;
    color: #374151;
    font-size: 14px;
}

.data-table td {
    color: #6b7280;
    font-size: 14px;
}

.data-table tbody tr:hover {
    background: #f9fafb;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.pagination button {
    padding: 8px 16px;
    border: 1px solid #e5e7eb;
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.pagination button:hover {
    border-color: #667eea;
    color: #667eea;
}

.pagination button.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 10px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-lg {
    max-width: 800px;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1f2937;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: #9ca3af;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: #1f2937;
}

.modal-body {
    padding: 20px;
}

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

.modal-body label {
    display: block;
    margin-bottom: 8px;
    color: #374151;
    font-size: 14px;
    font-weight: 500;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.keyword-select {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    min-height: 50px;
}

.keyword-item {
    background: #f3f4f6;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 5px;
}

.keyword-item:hover {
    background: #e5e7eb;
}

.keyword-item.selected {
    background: #667eea;
    color: white;
}

.keyword-item .remove {
    cursor: pointer;
    opacity: 0.7;
}

.keyword-item .remove:hover {
    opacity: 1;
}

.account-grid,
.video-grid,
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.card-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    background: #f3f4f6;
}

.card-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 5px;
}

.card-info p {
    color: #6b7280;
    font-size: 13px;
}

.card-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 15px;
}

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

.card-stat-value {
    font-size: 18px;
    font-weight: 700;
    color: #1f2937;
}

.card-stat-label {
    font-size: 12px;
    color: #6b7280;
}

.card-actions {
    display: flex;
    gap: 10px;
}

.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 6px;
    color: white;
    font-size: 14px;
    z-index: 9999;
    transform: translateX(400px);
    transition: transform 0.3s;
}

.message.show {
    transform: translateX(0);
}

.message.success {
    background: #10b981;
}

.message.error {
    background: #ef4444;
}

.message.warning {
    background: #f59e0b;
}

.message.info {
    background: #3b82f6;
}

.tabs {
    display: flex;
    border-bottom: 2px solid #e5e7eb;
    margin-bottom: 20px;
}

.tabs .tab {
    padding: 12px 20px;
    cursor: pointer;
    color: #6b7280;
    font-size: 14px;
    transition: all 0.3s;
}

.tabs .tab:hover {
    color: #667eea;
}

.tabs .tab.active {
    color: #667eea;
    border-bottom: 2px solid #667eea;
    margin-bottom: -2px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content pre {
    background: #f9fafb;
    padding: 15px;
    border-radius: 6px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.6;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

.badge-gray {
    background: #f3f4f6;
    color: #374151;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .charts-section {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}