/* 全局样式 */
:root {
  --primary-color: #1E90FF;
  --primary-light: #E6F2FF;
  --secondary-color: #FFA500;
  --secondary-light: #FFF0E0;
  --text-color: #333;
  --text-light: #666;
  --text-lighter: #999;
  --bg-color: #FFF;
  --border-color: #EEE;
  --success-color: #4CAF50;
  --warning-color: #FFC107;
  --error-color: #F44336;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
}

/* 布局样式 */
.task-center-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  min-height: calc(100vh - 120px);
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.task-header h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-color);
}

.task-actions {
  display: flex;
  gap: 15px;
}

/* 任务筛选样式 */
.task-filter {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 30px;
}

.filter-tabs {
  display: flex;
  gap: 10px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.filter-tab {
  padding: 8px 16px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-light);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

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

.filter-tab.active {
  color: var(--primary-color);
  background: var(--primary-light);
  font-weight: 500;
}

.search-box {
  display: flex;
  max-width: 400px;
}

.search-box input {
  flex: 1;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--primary-color);
}

.search-box button {
  padding: 0 15px;
  border: none;
  background: var(--primary-color);
  color: white;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  cursor: pointer;
  transition: var(--transition);
}

.search-box button:hover {
  background: #1a7fd9;
}

/* 任务列表样式 */
.task-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.task-card {
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.task-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.task-card-header {
  padding: 15px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.task-card-header h3 {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-color);
}

.task-status {
  font-size: 12px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.task-status.in-progress {
  background: var(--secondary-light);
  color: var(--secondary-color);
}

.task-status.completed {
  background: #E8F5E9;
  color: var(--success-color);
}

.task-card-body {
  padding: 15px;
}

.task-card-body p {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 15px;
}

.task-meta {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  color: var(--text-lighter);
}

.meta-item i {
  font-size: 14px;
}

.task-card-footer {
  padding: 15px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

/* 按钮样式 */
.button {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.primary-button:hover {
  background: #1a7fd9;
}

.secondary-button {
  background: white;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

.secondary-button:hover {
  background: var(--primary-light);
}

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

.modal.show {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
}

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

.modal-header h2 {
  font-size: 20px;
  font-weight: 600;
}

.close-modal {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-light);
  transition: var(--transition);
}

.close-modal:hover {
  color: var(--text-color);
}

.modal-body {
  padding: 20px;
}

/* 表单样式 */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 14px;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary-color);
  outline: none;
}

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

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

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

.file-upload {
  position: relative;
}

.file-upload input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.file-upload-label {
  display: inline-block;
  padding: 10px 15px;
  background: var(--primary-light);
  color: var(--primary-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  border: 1px dashed var(--primary-color);
  text-align: center;
  width: 100%;
}

.file-upload-label:hover {
  background: #d6e9ff;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .task-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }
  
  .task-filter {
    flex-direction: column;
  }
  
  .search-box {
    max-width: 100%;
  }
  
  .form-row {
    flex-direction: column;
    gap: 0;
  }
  
  .task-list {
    grid-template-columns: 1fr;
  }
}