/**
 * common.css - 公共样式表
 * 包含全局变量、重置样式、导航栏、按钮、表单、弹窗、卡片等通用组件
 */

/* ==================== CSS 变量定义 ==================== */
:root {
  /* 主题色 */
  --primary-color: #667eea;
  --primary-dark: #764ba2;
  --primary-light: #818cf8;
  --secondary-color: #48bb78;
  --danger-color: #f56565;
  --warning-color: #ed8936;
  --info-color: #4299e1;

  /* 背景色 */
  --bg-primary: #f7fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #edf2f7;

  /* 文字颜色 */
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --text-light: #a0aec0;

  /* 边框 */
  --border-color: #e2e8f0;
  --border-radius: 8px;

  /* 布局尺寸（统一管理，避免硬编码） */
  --navbar-height: 60px;          /* 导航栏高度 */
  --sidebar-width: 240px;         /* 侧边栏宽度（如需要） */
  --content-padding: 20px;        /* 内容区内边距 */
  --iframe-offset: 180px;         /* iframe高度偏移量（navbar + padding） */

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

  /* 过渡 */
  --transition: all 0.3s ease;

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

/* 暗色主题 */
[data-theme="dark"] {
  --bg-primary: #1a202c;
  --bg-secondary: #2d3748;
  --bg-tertiary: #4a5568;
  --text-primary: #f7fafc;
  --text-secondary: #cbd5e0;
  --text-light: #a0aec0;
  --border-color: #4a5568;
}

/* ==================== 护眼模式 ==================== */
/* 使用暖色调低对比度配色，减轻长时间用眼疲劳 */
[data-theme="eyecare"] {
  /* 主题色保持不变，维持品牌辨识度 */

  /* 背景色 —— 温暖米黄系 */
  --bg-primary: #f0e9d6;      /* 主背景：柔和米黄 */
  --bg-secondary: #f7f2e4;    /* 卡片背景：暖白 */
  --bg-tertiary: #e8dfc8;     /* 次级背景：浅暖灰 */

  /* 文字颜色 —— 暖棕系，降低对比度 */
  --text-primary: #5a4a36;    /* 主文字：暖深棕 */
  --text-secondary: #8a7a62;  /* 次要文字：暖灰棕 */
  --text-light: #b0a48c;      /* 辅助文字：浅暖棕 */

  /* 边框 */
  --border-color: #d9ccae;
  --border-radius: 8px;

  /* 阴影 —— 更柔和 */
  --shadow-sm: 0 1px 3px rgba(90, 74, 54, 0.08);
  --shadow-md: 0 4px 12px rgba(90, 74, 54, 0.1);
  --shadow-lg: 0 10px 30px rgba(90, 74, 54, 0.12);

  /* 渐变 —— 稍作暖化 */
  --gradient-primary: linear-gradient(135deg, #7c8a5a 0%, #8a7a4a 100%);
}

/* ==================== 全局重置 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

ul, ol {
  list-style: none;
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 1000;
}

/* Logo 区域 */
.navbar-logo {
  font-size: 20px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  margin-right: 40px;
  white-space: nowrap;
}

/* 导航菜单 */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.navbar-item {
  padding: 8px 16px;
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  white-space: nowrap;
}

.navbar-item:hover {
  background: var(--bg-tertiary);
  color: var(--primary-color);
}

.navbar-item.active {
  background: var(--gradient-primary);
  color: #fff;
}

/* 分组下拉导航 */
.navbar-item.has-dropdown {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
}

.navbar-item.has-dropdown .navbar-item-label {
  display: inline-flex;
  align-items: center;
}

.navbar-caret {
  font-size: 10px;
  opacity: 0.6;
  transition: transform var(--transition);
}

.navbar-item.has-dropdown.open .navbar-caret,
.navbar-item.has-dropdown:hover .navbar-caret {
  transform: rotate(180deg);
}

.navbar-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  display: none;
  flex-direction: column;
  z-index: 1100;
}

.navbar-item.has-dropdown:hover .navbar-dropdown,
.navbar-item.has-dropdown.open .navbar-dropdown {
  display: flex;
}

.navbar-dropdown.is-grid {
  display: none;
  grid-template-columns: 1fr 1fr;
  min-width: 360px;
}

.navbar-item.has-dropdown:hover .navbar-dropdown.is-grid,
.navbar-item.has-dropdown.open .navbar-dropdown.is-grid {
  display: grid;
}

.navbar-dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  font-size: 14px;
  text-decoration: none;
  transition: var(--transition);
}

/* 带 href 的导航项（跳转到独立页面） */
a.navbar-dropdown-item {
  color: var(--text-secondary);
}
a.navbar-dropdown-item:hover {
  color: var(--primary-color);
}
.navbar-item-link {
  color: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.navbar-dropdown-item i {
  width: 18px;
  text-align: center;
}

.navbar-dropdown-item:hover {
  background: var(--bg-tertiary);
  color: var(--primary-color);
}

.navbar-dropdown-item.active {
  background: var(--gradient-primary);
  color: #fff;
}

.navbar-dropdown-empty {
  padding: 16px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
  line-height: 1.7;
  white-space: nowrap;
}

/* 模块建设中占位 */
.coming-soon-wrap {
  max-width: 420px;
  margin: 80px auto;
  text-align: center;
  color: var(--text-secondary);
}

.coming-soon-wrap i {
  font-size: 48px;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.coming-soon-wrap h2 {
  font-size: 20px;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.coming-soon-wrap p {
  font-size: 14px;
  margin: 0;
}

/* 用户头像区域 */
.navbar-user {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 4px 12px;
  border-radius: 24px;
  transition: var(--transition);
}

.navbar-user:hover {
  background: var(--bg-tertiary);
}

.navbar-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
}

.navbar-user-avatar-placeholder {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
}

/* 默认头像图片（容器为 .profile-avatar 时内部 img 需填充圆形区域） */
.profile-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.navbar-user-name {
  font-size: 14px;
  color: var(--text-primary);
}

/* 下拉菜单 */
.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  overflow: hidden;
  display: none;
  z-index: 1001;
}

.user-dropdown.show {
  display: block;
}

.user-dropdown-item {
  padding: 12px 20px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  color: var(--text-primary);
}

.user-dropdown-item:hover {
  background: var(--bg-tertiary);
}

.user-dropdown-item.danger {
  color: var(--danger-color);
}

/* ==================== 护眼模式切换按钮 ==================== */

/* 导航栏中的主题切换按钮 */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  cursor: pointer;
  transition: var(--transition);
  font-size: 15px;
  color: var(--text-secondary);
  margin-right: 8px;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: scale(1.08);
}

/* 护眼模式激活时按钮高亮 */
.theme-toggle.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

/* 登录/注册页面的浮动主题切换按钮（无导航栏时使用） */
.theme-toggle-floating {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1500;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: var(--transition);
  font-size: 17px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle-floating:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.1);
}

/* 护眼模式下登录页背景也改为暖色 */
[data-theme="eyecare"] .auth-page {
  background: linear-gradient(135deg, #c4b994 0%, #b8a878 100%);
}

[data-theme="eyecare"] .auth-card {
  background: #f7f2e4;
}

/* ==================== 主内容区 ==================== */
.main-content {
  margin-top: var(--navbar-height);
  padding: var(--content-padding);
  min-height: calc(100vh - var(--navbar-height));
}

/* 页面区块（用于切换显示） */
.page-section {
  display: none;
}

.page-section.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==================== 卡片 ==================== */
.card {
  background: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

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

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

.btn-danger:hover {
  opacity: 0.9;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.form-label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  transition: var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

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

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

/* 输入框组（带按钮） */
.input-group {
  display: flex;
  gap: 8px;
}

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

/* ==================== 表格 ==================== */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}

.data-table th {
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
}

.data-table tr:hover {
  background: var(--bg-tertiary);
}

/* ==================== 弹窗/模态框 ==================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

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

.modal {
  background: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(-30px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-light);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ==================== 提示消息 ==================== */
.toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  z-index: 3000;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastSlideDown 0.3s ease;
}

@keyframes toastSlideDown {
  from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.toast-success {
  background: var(--secondary-color);
  color: #fff;
}

.toast-error {
  background: var(--danger-color);
  color: #fff;
}

.toast-info {
  background: var(--info-color);
  color: #fff;
}

/* ==================== 标签/徽章 ==================== */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.badge-primary {
  background: rgba(102, 126, 234, 0.1);
  color: var(--primary-color);
}

.badge-success {
  background: rgba(72, 187, 120, 0.1);
  color: var(--secondary-color);
}

.badge-danger {
  background: rgba(245, 101, 101, 0.1);
  color: var(--danger-color);
}

.badge-warning {
  background: rgba(237, 137, 54, 0.1);
  color: var(--warning-color);
}

.badge-info {
  background: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
}

/* ==================== 空状态 ==================== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state i {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state p {
  font-size: 16px;
  margin-bottom: 20px;
}

/* ==================== 统计卡片 ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  padding: 20px;
  text-align: center;
}

.stat-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-size: 20px;
  color: #fff;
}

.stat-card-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-card-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ==================== 分页 ==================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
}

.pagination button {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 14px;
  transition: var(--transition);
}

.pagination button:hover:not(:disabled) {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.pagination button.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ==================== 费用中心共享导航 ==================== */
.fee-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg-secondary, #f7f8fa);
  border: 1px solid var(--border-color, #e5e7eb);
  border-radius: var(--border-radius, 12px);
  margin-bottom: 20px;
}

.fee-nav .fee-nav-title {
  font-weight: 600;
  color: var(--text-primary, #1f2937);
  margin-right: 8px;
  font-size: 15px;
}

.fee-nav-link {
  padding: 7px 14px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-secondary, #4b5563);
  font-size: 14px;
  border: 1px solid transparent;
  transition: var(--transition, all 0.2s);
}

.fee-nav-link:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--primary-color, #2563eb);
}

.fee-nav-link.active {
  background: var(--gradient-primary, linear-gradient(135deg, #3b82f6, #6366f1));
  color: #fff;
  border-color: transparent;
}

.fee-nav-link.logout-link {
  color: #dc2626;
  border-color: rgba(220, 38, 38, 0.25);
}

.fee-nav-link.logout-link:hover {
  background: rgba(220, 38, 38, 0.08);
  color: #dc2626;
}

.page-wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary, #1f2937);
  margin: 0 0 4px;
}

.page-subtitle {
  color: var(--text-secondary, #6b7280);
  font-size: 14px;
  margin: 0 0 20px;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.product-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
}

.product-card .pc-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary, #1f2937);
  margin-bottom: 6px;
}

.product-card .pc-price {
  font-size: 26px;
  font-weight: 800;
  color: var(--primary-color, #2563eb);
  margin: 8px 0;
}

.product-card .pc-price small {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary, #6b7280);
}

.product-card .pc-desc {
  color: var(--text-secondary, #6b7280);
  font-size: 14px;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 14px;
}

.product-card .pc-meta {
  font-size: 13px;
  color: var(--text-secondary, #6b7280);
  margin-bottom: 14px;
}

.owned-flag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #dcfce7;
  color: #15803d;
  margin-bottom: 10px;
}

.muted {
  color: var(--text-secondary, #6b7280);
}

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

/* ==================== 邀请码卡片（各端复用） ==================== */
.invite-card { display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-start; }
.invite-qr { width: 184px; height: 184px; border: 1px solid var(--color-border-tertiary, rgba(0,0,0,0.12)); border-radius: 10px; display: flex; align-items: center; justify-content: center; background: #fff; padding: 8px; }
.invite-qr img { max-width: 100%; height: auto; }
.invite-meta { flex: 1 1 240px; min-width: 220px; }
.invite-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.invite-label { width: 64px; color: var(--text-secondary, #6b7280); font-size: 13px; flex: none; }
.invite-row code { font-size: 14px; background: #f0f2f5; padding: 2px 8px; border-radius: 6px; }

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  .navbar {
    padding: 0 12px;
    overflow-x: auto;
  }

  .navbar-menu {
    gap: 2px;
  }

  .navbar-item {
    padding: 6px 10px;
    font-size: 13px;
  }

  .navbar-user-name {
    display: none;
  }

  /* 移动端：下拉改为全宽固定定位，避免被导航栏横向滚动裁切 */
  .navbar-item.has-dropdown .navbar-dropdown,
  .navbar-item.has-dropdown.open .navbar-dropdown,
  .navbar-item.has-dropdown:hover .navbar-dropdown {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    min-width: 0;
    border-radius: 0;
    max-height: 70vh;
    overflow-y: auto;
  }

  .navbar-dropdown.is-grid {
    grid-template-columns: 1fr;
    min-width: 0;
  }

  /* 移动端：用户头像下拉同样改为固定定位，避免被 navbar 的 overflow 裁切 */
  .navbar-user .user-dropdown {
    position: fixed;
    top: 60px;
    right: 12px;
    left: auto;
    min-width: 160px;
  }

  .main-content {
    padding: 16px;
  }

  .form-row {
    flex-direction: column;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* ==================== 工具类 ==================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary-color); }
.text-danger { color: var(--danger-color); }
.text-success { color: var(--secondary-color); }
.text-secondary { color: var(--text-secondary); }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

/* ==================== 可访问性：全局焦点指示器 ==================== */
/*
 * 为所有交互元素提供清晰的焦点样式
 * 支持键盘导航和屏幕阅读器用户
 */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* 按钮和链接的焦点样式 */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
}

/* 移除鼠标点击时的默认焦点轮廓（仅保留键盘导航） */
:focus:not(:focus-visible) {
  outline: none;
}

/* ==================== 响应式增强 ==================== */

/* 平板设备（768px - 1024px） */
@media (max-width: 1024px) and (min-width: 769px) {
  .navbar-menu {
    gap: 12px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 大屏手机（< 768px） */
@media (max-width: 768px) {
  :root {
    --navbar-height: 56px;
    --content-padding: 16px;
    --iframe-offset: 140px;
  }

  .main-content {
    padding: var(--content-padding);
  }
}

/* 小屏手机（< 480px） */
@media (max-width: 480px) {
  :root {
    --navbar-height: 50px;
    --content-padding: 12px;
    --iframe-offset: 120px;
    /* 缩小模式切换面板尺寸 */
    --mode-center-size: 160px;
    --mode-circle-size: 70px;
  }

  .navbar {
    padding: 0 8px;
    overflow-x: auto;
  }

  .navbar-menu {
    gap: 4px;
  }

  .navbar-menu a {
    padding: 6px 10px;
    font-size: 13px;
  }
}

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }

.hidden { display: none !important; }