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

:root {
    --primary-color: #1890ff;
    --primary-hover: #40a9ff;
    --success-color: #52c41a;
    --warning-color: #faad14;
    --danger-color: #ff4d4f;
    --text-color: #333;
    --text-secondary: #666;
    --border-color: #d9d9d9;
    --bg-color: #f0f2f5;
    --white: #fff;
    --shadow: 0 2px 8px rgba(0,0,0,0.15);
    --radius: 4px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.5;
}

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

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

.btn {
    display: inline-block;
    padding: 4px 15px;
    height: 32px;
    font-size: 14px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s;
    background: var(--white);
    line-height: 22px;
}

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

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

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

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

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

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

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

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

.btn-link {
    border: none;
    background: none;
    color: var(--primary-color);
    padding: 0 8px;
    height: auto;
}

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

.btn-sm {
    height: 24px;
    padding: 0 8px;
    font-size: 12px;
}

.table-container {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.search-box {
    display: flex;
    gap: 10px;
    align-items: center;
}

.search-box input,
.search-box select {
    height: 32px;
    padding: 4px 11px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
}

.search-box input:focus,
.search-box select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(24,144,255,0.2);
}

table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
}

th, td {
    padding: 12px 8px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: #fafafa;
    font-weight: 600;
}

tr:hover {
    background: #fafafa;
}

.pagination {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: 16px;
    gap: 8px;
}

.pagination span {
    color: var(--text-secondary);
}

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

.modal {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 600px;
    max-width: 90%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 16px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 4px 11px;
    height: 32px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
}

.form-group textarea {
    height: 80px;
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(24,144,255,0.2);
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .form-group {
    flex: 1;
}

.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 2px;
    font-size: 12px;
    line-height: 20px;
}

.tag-blue {
    background: #e6f7ff;
    color: var(--primary-color);
    border: 1px solid #91d5ff;
}

.tag-green {
    background: #f6ffed;
    color: var(--success-color);
    border: 1px solid #b7eb8f;
}

.tag-orange {
    background: #fff7e6;
    color: var(--warning-color);
    border: 1px solid #ffd591;
}

.tag-red {
    background: #fff2f0;
    color: var(--danger-color);
    border: 1px solid #ffccc7;
}

.status-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
}

.status-open {
    background: #e6f7ff;
    color: var(--primary-color);
}

.status-processing {
    background: #fff7e6;
    color: var(--warning-color);
}

.status-closed {
    background: #f6ffed;
    color: var(--success-color);
}

.status-escalated {
    background: #fff2f0;
    color: var(--danger-color);
}

.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
}

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    color: var(--border-color);
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
}

.tab {
    padding: 12px 24px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
}

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

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline-item {
    position: relative;
    padding-bottom: 24px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -21px;
    top: 4px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: -17px;
    top: 14px;
    width: 1px;
    height: calc(100% - 14px);
    background: var(--border-color);
}

.timeline-item:last-child::after {
    display: none;
}

.timeline-content {
    background: #fafafa;
    padding: 12px;
    border-radius: var(--radius);
}

.timeline-time {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.timeline-desc {
    color: var(--text-color);
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-danger { color: var(--danger-color); }
.text-secondary { color: var(--text-secondary); }

.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }