:root {
  --primary: #1677ff;
  --primary-hover: #4096ff;
  --success: #52c41a;
  --warning: #faad14;
  --danger: #ff4d4f;
  --text: #1f1f1f;
  --text-secondary: #666;
  --border: #e8e8e8;
  --bg: #f5f5f5;
  --white: #fff;
  --sidebar-bg: #001529;
  --sidebar-text: rgba(255, 255, 255, 0.75);
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

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

button,
input,
select,
textarea {
  font: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

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

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

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

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

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

.btn-sm {
  padding: 4px 10px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
}

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

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

.tag-warning {
  background: #fffbe6;
  color: #d48806;
  border: 1px solid #ffe58f;
}

.tag-default {
  background: #fafafa;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

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

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

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  color: var(--text);
}

.form-group label .required {
  color: var(--danger);
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.form-row-3 {
  grid-template-columns: repeat(3, 1fr);
}

.form-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table th,
table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

table th {
  background: #fafafa;
  font-weight: 600;
  white-space: nowrap;
}

table tr:hover td {
  background: #fafafa;
}

.table-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.show {
  display: flex;
}

.modal {
  background: var(--white);
  border-radius: var(--radius);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

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

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  padding: 12px 20px 20px;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  padding: 10px 20px;
  border-radius: 6px;
  z-index: 2000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
}

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

.page-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 16px;
}

.page-toolbar .filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}

.page-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
}

.stat-card .label {
  color: var(--text-secondary);
  font-size: 13px;
}

.stat-card .value {
  font-size: 24px;
  font-weight: 600;
  margin-top: 4px;
}

@media (max-width: 768px) {
  .form-row,
  .form-row-3,
  .stats-row {
    grid-template-columns: 1fr;
  }
}