/* 基础样式 */
:root {
  --primary-color: #4a6da7;
  --primary-hover: #3c5a8a;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  --border-color: #dee2e6;
  --border-radius: 4px;
  --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

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

/* 头部导航 */
.header {
  background-color: var(--dark-color);
  color: white;
  padding: 1rem 0;
  box-shadow: var(--box-shadow);
}

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

.logo h1 {
  font-size: 1.5rem;
  margin: 0;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 1.5rem;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  color: white;
}

.nav-logout {
  margin-left: auto;
}

.nav-logout a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s;
  background-color: rgba(220, 53, 69, 0.2);
  padding: 0.3rem 0.8rem;
  border-radius: var(--border-radius);
}

.nav-logout a:hover {
  color: white;
  background-color: rgba(220, 53, 69, 0.4);
}

.lang-selector select {
  background-color: transparent;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.3rem 0.5rem;
  border-radius: var(--border-radius);
}

/* 主内容区 */
.main {
  padding: 2rem 0;
  min-height: calc(100vh - 140px);
}

/* 页面头部 */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.page-header h2 {
  margin: 0;
}

/* 表单元素 */
.form-group {
  margin-bottom: 1rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

input, select, textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: inherit;
}

.checkbox-label {
  display: flex;
  align-items: center;
}

.checkbox-label input {
  width: auto;
  margin-right: 0.5rem;
}

.form-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* 按钮 */
.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  user-select: none;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: var(--border-radius);
  transition: all 0.15s ease-in-out;
  cursor: pointer;
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
}

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

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

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

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

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

/* 表格 */
.table-container {
  overflow-x: auto;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 1.5rem;
}

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

.data-table th, 
.data-table td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.data-table th {
  background-color: #f8f9fa;
  font-weight: 600;
}

.data-table tbody tr:hover {
  background-color: rgba(0, 0, 0, 0.02);
}

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

/* 过滤器和搜索 */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.filter-group {
  min-width: 200px;
}

.search-box {
  flex-grow: 1;
}

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  list-style: none;
  gap: 0.25rem;
}

.pagination-item {
  display: inline-block;
}

.pagination-link {
  display: block;
  padding: 0.5rem 0.75rem;
  text-decoration: none;
  color: var(--primary-color);
  background-color: white;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.pagination-link:hover {
  background-color: var(--light-color);
}

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

.pagination-link.disabled {
  color: var(--secondary-color);
  pointer-events: none;
  opacity: 0.5;
}

/* 状态标签 */
.status-badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.status-pending {
  background-color: var(--warning-color);
  color: #212529;
}

.status-in-progress {
  background-color: var(--info-color);
  color: white;
}

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

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

/* 模态框 */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background-color: white;
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

.modal-title {
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--secondary-color);
}

.modal-body {
  padding: 1rem;
}

.modal-footer {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.hidden {
  display: none;
}

/* 反馈详情 */
.feedback-detail {
  display: grid;
  gap: 1.5rem;
}

.feedback-content {
  background-color: #f8f9fa;
  padding: 1rem;
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
}

.feedback-meta h4 {
  margin-bottom: 0.5rem;
}

.feedback-info p {
  margin-bottom: 0.5rem;
}

.feedback-actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
}

/* 首页样式 */
.dashboard {
  display: grid;
  gap: 1.5rem;
}

.dashboard-section {
  background-color: white;
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
}

.section-title {
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.stats-item {
  padding: 1.5rem;
  background-color: #f8f9fa;
  border-radius: var(--border-radius);
  text-align: center;
}

.stats-item h3 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.feedback-list {
  display: grid;
  gap: 1rem;
}

.feedback-item {
  padding: 1rem;
  background-color: #f8f9fa;
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
}

.feedback-item h3 {
  margin-bottom: 0.5rem;
}

.feedback-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.feedback-excerpt {
  margin-bottom: 1rem;
}

/* 警告提示 */
#alerts-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  max-width: 300px;
}

.alert {
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  opacity: 1;
  transition: opacity 0.5s;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-danger {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.alert-warning {
  background-color: #fff3cd;
  color: #856404;
  border: 1px solid #ffeeba;
}

.alert-info {
  background-color: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}

/* 页脚 */
.footer {
  background-color: var(--dark-color);
  color: white;
  padding: 1rem 0;
  text-align: center;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
  .header .container {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    margin-top: 0.5rem;
  }
  
  .lang-selector {
    margin-top: 0.5rem;
  }
  
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .filters {
    flex-direction: column;
  }
  
  .filter-group, .search-box {
    width: 100%;
  }
  
  .data-table th, 
  .data-table td {
    padding: 0.5rem;
  }
  
  .modal-content {
    width: 95%;
  }
}