/**
 * 管理后台样式
 * 
 * 仅包含 admin.html 特有的样式
 * 公共样式和变量请查看 common.css
 */

/* 管理后台特有变量 */
:root {
  --table-header-bg: #f2f2f2;
  --input-bg: #ffffff;
  --sidebar-bg: #2c3e50;
  --sidebar-text: #ecf0f1;
  --sidebar-hover: #34495e;
  --sidebar-active: #3498db;
}

[data-theme="dark"] {
  --table-header-bg: #2c2c2c;
  --input-bg: #2a2a2a;
  --sidebar-bg: #1a1a2e;
  --sidebar-text: #ecf0f1;
  --sidebar-hover: #16213e;
  --sidebar-active: #0f3460;
}

/* 管理后台布局 */
.admin-container {
  display: flex;
  min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 100;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.nav-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;
}

.nav-menu li {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-menu a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 20px;
  color: var(--sidebar-text);
  text-decoration: none;
  transition: background 0.2s;
}

.nav-menu a:hover {
  background: var(--sidebar-hover);
}

.nav-menu a.active {
  background: var(--sidebar-active);
  border-left: 3px solid var(--primary);
}

.nav-menu a i {
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.theme-toggle {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--sidebar-text);
  padding: 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.logout-btn {
  background: var(--danger);
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

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

/* 主内容区域 */
.main-content {
  flex: 1;
  margin-left: 220px;
  padding: 20px;
  background: var(--bg-color);
  min-height: 100vh;
}

/* 移动端侧边栏 */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
}

/* 全局样式 */
* {
  box-sizing: border-box;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: var(--bg-color);
  color: var(--text-color);
}

/* 容器样式 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  background-color: var(--container-bg);
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px var(--shadow-color);
}

/* 标题样式 */
h1 {
  color: var(--text-color);
  margin-bottom: 20px;
}

/* 章节样式 */
.section {
  margin-bottom: 30px;
}

.section-header {
  margin-bottom: 15px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border-color);
}

/* 表单样式 */
.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--container-bg);
  color: var(--text-color);
}

/* 可搜索下拉选择器样式 */
.searchable-select-wrapper {
  position: relative;
  width: 100%;
}

.searchable-select {
  position: relative;
  width: 100%;
}

.searchable-select-display {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--container-bg);
  color: var(--text-color);
  font-size: 14px;
  line-height: 1.5;
  height: 38px;
  box-sizing: border-box;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: border-color 0.2s;
}

.searchable-select-display:hover {
  border-color: var(--primary);
}

.searchable-select:focus .searchable-select-display,
.searchable-select.open .searchable-select-display {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}

.searchable-select.disabled .searchable-select-display {
  opacity: 0.6;
  cursor: not-allowed;
}

.select-arrow {
  transition: transform 0.2s;
}

.searchable-select.open .select-arrow {
  transform: rotate(180deg);
}

.searchable-select-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 4px;
  background: var(--container-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: 0 4px 12px var(--shadow-color);
  z-index: 1000;
  max-height: 250px;
  overflow: hidden;
  flex-direction: column;
  display: none;
}

.searchable-select.open .searchable-select-dropdown {
  display: flex;
}

.select-search-input {
  width: 100%;
  padding: 8px;
  border: none;
  border-bottom: 1px solid var(--border-color);
  background: var(--container-bg);
  color: var(--text-color);
  outline: none;
  box-sizing: border-box;
}

.select-options {
  overflow-y: auto;
  flex: 1;
}

.select-option {
  padding: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.select-option:hover {
  background: var(--table-header-bg);
}

.select-option.selected {
  background: var(--primary);
  color: white;
}

.select-option.no-results {
  color: var(--text-secondary);
  cursor: default;
}

.select-option.no-results:hover {
  background: transparent;
}

/* 按钮样式 */
button {
  padding: 10px 15px;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 10px;
  transition: background-color 0.3s;
}

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

/* 危险按钮样式 */
#clearHomework {
  background-color: var(--danger);
}

#clearHomework:hover {
  background-color: var(--danger-hover);
}

/* 表格样式 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

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

.data-table th {
  background-color: var(--table-header-bg);
}

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

.timetable-admin-tip {
  margin: 6px 0 0;
  color: var(--text-secondary);
}

.timetable-admin-frame {
  width: 100%;
  min-height: 980px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--container-bg);
}

/* 编辑面板样式 */
.edit-panel {
  display: none;
  margin-top: 20px;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--container-bg);
}

/* 媒体查询 - 移动端优化 */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }
  
  .container {
    padding: 15px;
  }
  
  button {
    margin-bottom: 10px;
    margin-right: 5px;
  }
  
  .data-table {
    font-size: 14px;
  }
  
  .data-table th,
  .data-table td {
    padding: 6px;
  }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
  .container {
    padding: 10px;
  }
  
  h1 {
    font-size: 20px;
  }
  
  button {
    padding: 8px 12px;
    font-size: 14px;
  }
}

/* 页脚样式 */
footer {
  margin-top: 30px;
  padding: 15px;
  text-align: center;
  color: var(--text-color);
  opacity: 0.7;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
}

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

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-links a:hover {
  text-decoration: underline;
}