:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --success-color: #10b981;
    --success-light: #d1fae5;
    --danger-color: #ef4444;
    --danger-light: #fee2e2;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --info-color: #06b6d4;
    --info-light: #cffafe;
    
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
    --sidebar-active: #4f46e5;
    --sidebar-text: #cbd5e1;
    --sidebar-text-active: #fff;
    
    --header-bg: #fff;
    --header-border: #e2e8f0;
    
    --content-bg: #f8fafc;
    --card-bg: #fff;
    --card-border: #e2e8f0;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    --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);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--content-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--card-border);
}

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    gap: 6px;
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-primary {
    background: var(--primary-color);
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-success {
    background: var(--success-color);
}

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

.btn-danger {
    background: var(--danger-color);
}

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

.btn-warning {
    background: var(--warning-color);
}

.btn-warning:hover {
    background: #d97706;
}

.btn-default {
    background: #f1f5f9;
    color: var(--text-primary);
}

.btn-default:hover {
    background: #e2e8f0;
}

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

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.form-group label .required {
    color: var(--danger-color);
    margin-left: 4px;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    transition: all var(--transition-fast);
    background: #fff;
}

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

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control:disabled {
    background: #f8fafc;
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-control textarea {
    min-height: 100px;
    resize: vertical;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2364748b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 12px center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-right: 40px;
}

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

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--card-border);
}

.table th,
.table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--card-border);
    font-size: 14px;
}

.table th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.table tbody tr {
    transition: background var(--transition-fast);
}

.table tbody tr:hover {
    background: #f8fafc;
}

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

.table .checkbox-cell {
    width: 40px;
}

.table .checkbox-cell input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

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

.badge-success {
    background: var(--success-light);
    color: var(--success-color);
}

.badge-danger {
    background: var(--danger-light);
    color: var(--danger-color);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning-color);
}

.badge-info {
    background: var(--info-light);
    color: var(--info-color);
}

.badge-default {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-box input {
    padding: 10px 14px;
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    width: 220px;
    transition: all var(--transition-fast);
}

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

.search-box select {
    padding: 10px 14px;
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    min-width: 120px;
}

.pagination {
    display: flex;
    gap: 6px;
    justify-content: center;
    margin-top: 20px;
    align-items: center;
}

.pagination a,
.pagination span {
    padding: 8px 14px;
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.pagination a:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.pagination .active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

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

.alert {
    padding: 16px 20px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 14px;
}

.alert-success {
    background: var(--success-light);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-danger {
    background: var(--danger-light);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: var(--warning-light);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert-info {
    background: var(--info-light);
    color: var(--info-color);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--card-border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

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

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 0;
    min-width: 500px;
    max-width: 90%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.25s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--card-border);
    background: #f8fafc;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-muted);
    border-radius: 50%;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: #e2e8f0;
    color: var(--text-secondary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 20px 24px;
    border-top: 1px solid var(--card-border);
    background: #f8fafc;
}

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

.empty-state .empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-muted);
}

.empty-state .btn {
    margin-top: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 280px;
}

.form-row .form-group.col-md-6 {
    flex: 0 0 calc(50% - 10px);
    max-width: calc(50% - 10px);
    min-width: 280px;
}

.tabs {
    display: flex;
    gap: 0;
    background: #f1f5f9;
    padding: 4px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 20px;
}

.tab-btn {
    padding: 10px 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--card-bg);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 6px;
}

.action-buttons .btn {
    padding: 5px 10px;
    font-size: 12px;
    gap: 4px;
}

.progress-bar {
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar .progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, #6366f1 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

@media (max-width: 768px) {
    .form-row .form-group.col-md-6 {
        flex: 1;
        max-width: 100%;
    }
    
    .modal-content {
        min-width: 90%;
        margin: 15px;
    }
    
    .search-box input {
        width: 150px;
    }
}