/* ============================================================
 * 智慧宫 - 暗黑模式样式
 * 通过 body.dark-mode 触发，同时响应系统 prefers-color-scheme
 * ============================================================ */

/* ============ CSS 变量定义 ============ */
:root {
  --dm-bg-primary: #0f1117;
  --dm-bg-secondary: #161822;
  --dm-bg-card: #1a1d2e;
  --dm-bg-elevated: #202436;
  --dm-bg-hover: #252940;
  --dm-bg-input: #1a1d2e;
  --dm-border: #2a2d3e;
  --dm-border-light: #353850;
  --dm-text-primary: #e4e6f0;
  --dm-text-secondary: #9a9cb8;
  --dm-text-muted: #6b6d88;
  --dm-accent: #6c8cff;
  --dm-accent-hover: #8aa5ff;
  --dm-accent-bg: rgba(108, 140, 255, 0.12);
  --dm-success: #4ecb71;
  --dm-warning: #f0a040;
  --dm-danger: #f05050;
  --dm-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  --dm-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
}

/* ============ 全局样式 ============ */
body.dark-mode {
  background: var(--dm-bg-primary);
  color: var(--dm-text-primary);
}

body.dark-mode a {
  color: var(--dm-accent);
}

body.dark-mode a:hover {
  color: var(--dm-accent-hover);
}

/* ============ 顶部导航栏 ============ */
body.dark-mode .gh-nav,
body.dark-mode .nav-bar,
body.dark-mode header {
  background: var(--dm-bg-secondary);
  border-bottom: 1px solid var(--dm-border);
}

body.dark-mode .gh-nav .nav-row-top,
body.dark-mode .gh-nav .nav-links a {
  color: var(--dm-text-secondary);
}

body.dark-mode .gh-nav .nav-links a:hover,
body.dark-mode .gh-nav .nav-links a.active {
  color: var(--dm-accent);
  background: var(--dm-accent-bg);
}

body.dark-mode .nav-avatar {
  border-color: var(--dm-border);
}

/* ============ 侧边栏 ============ */
body.dark-mode .sidebar,
body.dark-mode .collapsible-sidebar,
body.dark-mode .left-sidebar {
  background: var(--dm-bg-secondary);
  border-right: 1px solid var(--dm-border);
}

body.dark-mode .sidebar a,
body.dark-mode .sidebar .nav-item,
body.dark-mode .collapsible-sidebar .sidebar-item {
  color: var(--dm-text-secondary);
}

body.dark-mode .sidebar a:hover,
body.dark-mode .sidebar .nav-item:hover,
body.dark-mode .collapsible-sidebar .sidebar-item:hover,
body.dark-mode .sidebar a.active,
body.dark-mode .collapsible-sidebar .sidebar-item.active {
  color: var(--dm-accent);
  background: var(--dm-accent-bg);
}

body.dark-mode .sidebar-section-title,
body.dark-mode .collapsible-sidebar .section-header {
  color: var(--dm-text-muted);
}

/* ============ 卡片 ============ */
body.dark-mode .card,
body.dark-mode .lesson-card,
body.dark-mode .repo-card,
body.dark-mode .stat-card,
body.dark-mode .modern-card,
body.dark-mode .platform-card,
body.dark-mode [class*="-card"] {
  background: var(--dm-bg-card);
  border: 1px solid var(--dm-border);
  box-shadow: var(--dm-shadow);
}

body.dark-mode .card:hover,
body.dark-mode .lesson-card:hover,
body.dark-mode .repo-card:hover,
body.dark-mode .modern-card:hover {
  background: var(--dm-bg-elevated);
  border-color: var(--dm-border-light);
  box-shadow: var(--dm-shadow-lg);
}

body.dark-mode .card-title,
body.dark-mode .lesson-card h3,
body.dark-mode .card-header {
  color: var(--dm-text-primary);
}

body.dark-mode .card-subtitle,
body.dark-mode .card-desc {
  color: var(--dm-text-secondary);
}

body.dark-mode .card-meta {
  color: var(--dm-text-muted);
}

/* ============ 视图容器 ============ */
body.dark-mode .view {
  background: var(--dm-bg-primary);
}

/* ============ 页面容器/板块 ============ */
body.dark-mode .container,
body.dark-mode .content-area,
body.dark-mode .main-content,
body.dark-mode .page-content {
  background: transparent;
}

body.dark-mode section,
body.dark-mode .section {
  background: var(--dm-bg-secondary);
  border: 1px solid var(--dm-border);
}

/* ============ 模态框/弹窗 ============ */
body.dark-mode .modal,
body.dark-mode .modal-overlay,
body.dark-mode .modal-content,
body.dark-mode .dialog,
body.dark-mode .popup,
body.dark-mode [class*="modal"] {
  background: var(--dm-bg-elevated);
  border: 1px solid var(--dm-border-light);
  box-shadow: var(--dm-shadow-lg);
}

body.dark-mode .modal-header,
body.dark-mode .modal-footer,
body.dark-mode .dialog-header {
  border-color: var(--dm-border);
}

body.dark-mode .modal-title {
  color: var(--dm-text-primary);
}

/* ============ 表单元素 ============ */
body.dark-mode input[type="text"],
body.dark-mode input[type="search"],
body.dark-mode input[type="email"],
body.dark-mode input[type="password"],
body.dark-mode input[type="url"],
body.dark-mode input[type="number"],
body.dark-mode textarea,
body.dark-mode select {
  background: var(--dm-bg-input);
  color: var(--dm-text-primary);
  border: 1px solid var(--dm-border);
}

body.dark-mode input:focus,
body.dark-mode textarea:focus,
body.dark-mode select:focus {
  border-color: var(--dm-accent);
  box-shadow: 0 0 0 3px var(--dm-accent-bg);
  outline: none;
}

body.dark-mode input::placeholder,
body.dark-mode textarea::placeholder {
  color: var(--dm-text-muted);
}

body.dark-mode label {
  color: var(--dm-text-secondary);
}

/* ============ 按钮 ============ */
body.dark-mode button:not(.gh-btn-primary):not(.nav-btn):not(.theme-toggle) {
  background: var(--dm-bg-elevated);
  color: var(--dm-text-secondary);
  border: 1px solid var(--dm-border);
}

body.dark-mode button:not(.gh-btn-primary):not(.nav-btn):hover {
  background: var(--dm-bg-hover);
  color: var(--dm-text-primary);
  border-color: var(--dm-border-light);
}

body.dark-mode .gh-btn-primary,
body.dark-mode .btn-primary,
body.dark-mode button.primary {
  background: var(--dm-accent);
  color: #fff;
  border-color: var(--dm-accent);
}

body.dark-mode .gh-btn-primary:hover,
body.dark-mode .btn-primary:hover {
  background: var(--dm-accent-hover);
}

body.dark-mode .btn-danger {
  background: var(--dm-danger);
  color: #fff;
}

body.dark-mode .btn-success {
  background: var(--dm-success);
  color: #fff;
}

/* ============ 表格 ============ */
body.dark-mode table {
  border-color: var(--dm-border);
}

body.dark-mode th {
  background: var(--dm-bg-secondary);
  color: var(--dm-text-secondary);
  border-color: var(--dm-border);
}

body.dark-mode td {
  border-color: var(--dm-border);
  color: var(--dm-text-primary);
}

body.dark-mode tr:hover td {
  background: var(--dm-bg-hover);
}

body.dark-mode tr:nth-child(even) td {
  background: var(--dm-bg-card);
}

/* ============ Tab 标签页 ============ */
body.dark-mode .tabs,
body.dark-mode .tab-bar,
body.dark-mode .tab-nav {
  border-bottom-color: var(--dm-border);
}

body.dark-mode .tab,
body.dark-mode .tab-item,
body.dark-mode .tab-btn {
  color: var(--dm-text-secondary);
}

body.dark-mode .tab:hover,
body.dark-mode .tab-item:hover {
  color: var(--dm-text-primary);
  background: var(--dm-bg-hover);
}

body.dark-mode .tab.active,
body.dark-mode .tab-item.active,
body.dark-mode .tab-btn.active {
  color: var(--dm-accent);
  border-bottom-color: var(--dm-accent);
}

/* ============ 标签/徽章 ============ */
body.dark-mode .badge,
body.dark-mode .tag,
body.dark-mode .label {
  background: var(--dm-accent-bg);
  color: var(--dm-accent);
  border: 1px solid var(--dm-border-light);
}

body.dark-mode .badge-success { background: rgba(78, 203, 113, 0.15); color: var(--dm-success); }
body.dark-mode .badge-warning { background: rgba(240, 160, 64, 0.15); color: var(--dm-warning); }
body.dark-mode .badge-danger { background: rgba(240, 80, 80, 0.15); color: var(--dm-danger); }

/* ============ 下拉菜单 ============ */
body.dark-mode .dropdown-menu,
body.dark-mode .context-menu,
body.dark-mode .select-dropdown,
body.dark-mode [class*="dropdown"] {
  background: var(--dm-bg-elevated);
  border: 1px solid var(--dm-border-light);
  box-shadow: var(--dm-shadow-lg);
}

body.dark-mode .dropdown-item {
  color: var(--dm-text-secondary);
}

body.dark-mode .dropdown-item:hover {
  background: var(--dm-bg-hover);
  color: var(--dm-text-primary);
}

/* ============ 分隔线 ============ */
body.dark-mode hr,
body.dark-mode .divider {
  border-color: var(--dm-border);
}

/* ============ 加载/骨架屏 ============ */
body.dark-mode .loading-block,
body.dark-mode .skeleton,
body.dark-mode .loading {
  background: var(--dm-bg-card);
}

body.dark-mode .spinner {
  border-color: var(--dm-border);
  border-top-color: var(--dm-accent);
}

/* ============ 消息/通知 ============ */
body.dark-mode .toast,
body.dark-mode .notification,
body.dark-mode .alert {
  background: var(--dm-bg-elevated);
  border: 1px solid var(--dm-border-light);
  box-shadow: var(--dm-shadow-lg);
}

body.dark-mode .toast-success { border-left: 4px solid var(--dm-success); }
body.dark-mode .toast-error { border-left: 4px solid var(--dm-danger); }
body.dark-mode .toast-warning { border-left: 4px solid var(--dm-warning); }
body.dark-mode .toast-info { border-left: 4px solid var(--dm-accent); }

/* ============ 代码块 ============ */
body.dark-mode pre,
body.dark-mode code,
body.dark-mode .code-block {
  background: #0d1117;
  color: #c9d1d9;
  border: 1px solid var(--dm-border);
}

/* ============ 滚动条 ============ */
body.dark-mode ::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

body.dark-mode ::-webkit-scrollbar-track {
  background: var(--dm-bg-primary);
}

body.dark-mode ::-webkit-scrollbar-thumb {
  background: var(--dm-border-light);
  border-radius: 4px;
}

body.dark-mode ::-webkit-scrollbar-thumb:hover {
  background: var(--dm-text-muted);
}

/* ============ 搜索框 ============ */
body.dark-mode .search-box,
body.dark-mode .search-bar,
body.dark-mode .search-input-wrap {
  background: var(--dm-bg-input);
  border-color: var(--dm-border);
}

/* ============ 进度条 ============ */
body.dark-mode .progress-bar,
body.dark-mode .progress {
  background: var(--dm-border);
}

body.dark-mode .progress-fill,
body.dark-mode .progress-bar-fill {
  background: var(--dm-accent);
}

/* ============ Toggle 开关 ============ */
body.dark-mode .toggle-track {
  background: var(--dm-border);
}

body.dark-mode .toggle-thumb {
  background: var(--dm-text-secondary);
}

body.dark-mode .toggle-track.active {
  background: var(--dm-accent);
}

/* ============ Issue/PR 状态标签 ============ */
body.dark-mode .status-open { background: rgba(78, 203, 113, 0.15); color: var(--dm-success); }
body.dark-mode .status-closed { background: rgba(240, 80, 80, 0.15); color: var(--dm-danger); }
body.dark-mode .status-merged { background: rgba(108, 140, 255, 0.15); color: var(--dm-accent); }

/* ============ 空状态 ============ */
body.dark-mode .empty-state,
body.dark-mode .no-data {
  color: var(--dm-text-muted);
}

/* ============ 工具提示 ============ */
body.dark-mode .tooltip {
  background: var(--dm-bg-elevated);
  color: var(--dm-text-primary);
  border: 1px solid var(--dm-border-light);
}

/* ============ 页脚 ============ */
body.dark-mode footer,
body.dark-mode .footer {
  background: var(--dm-bg-secondary);
  border-top: 1px solid var(--dm-border);
  color: var(--dm-text-muted);
}

/* ============ 图片/头像暗色适配 ============ */
body.dark-mode img {
  opacity: 0.92;
}

body.dark-mode img:hover {
  opacity: 1;
}

/* ============ 选择文本颜色 ============ */
body.dark-mode ::selection {
  background: var(--dm-accent-bg);
  color: var(--dm-text-primary);
}

/* ============ Focus visible ============ */
body.dark-mode *:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 2px;
}

/* ========== 暗黑模式切换按钮 ========== */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid #e0e0e0;
  border-radius: 50%;
  background: transparent;
  font-size: 18px;
  cursor: pointer;
  margin: 0 8px;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  background: #f5f5f5;
  transform: scale(1.1);
}

.theme-toggle-btn:active {
  transform: scale(0.95);
}

body.dark-mode .theme-toggle-btn {
  border-color: var(--dm-border);
  background: var(--dm-bg-elevated);
}

body.dark-mode .theme-toggle-btn:hover {
  background: var(--dm-bg-hover);
}

/* 按钮 tooltip */
.theme-toggle-btn::after {
  content: attr(title);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
}

.theme-toggle-btn:hover::after {
  opacity: 1;
}