/* ============================================================
   资源导航管理系统 - 全局样式表
   全面 UI 优化：色彩、排版、布局、交互、响应式
   ============================================================ */

/* ----- CSS 自定义属性（设计令牌）----- */
:root {
  /* 主色调 */
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: #eff6ff;
  --color-primary-dark: #1e40af;

  /* 辅助色 */
  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-danger-light: #fef2f2;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;

  /* 中性色 */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* 背景色 */
  --bg-page: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f8fafc;
  --bg-sidebar: #0f172a;
  --bg-sidebar-hover: #1e293b;
  --bg-topbar: #ffffff;

  /* 文字色 */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  --text-sidebar: #cbd5e1;
  --text-sidebar-active: #ffffff;

  /* 边框 */
  --border-color: #e2e8f0;
  --border-color-light: #f1f5f9;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

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

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", "Monaco", monospace;

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* 侧边栏宽度 */
  --sidebar-width: 240px;
}

/* ----- 全局重置与基础样式 ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 0.933rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-page);
}

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

img, video {
  max-width: 100%;
  height: auto;
}

/* ----- 通用辅助类 ----- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   管理后台布局
   ============================================================ */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  padding: 24px 16px;
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-width);
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 28px;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.067rem;
  font-weight: 700;
  padding: 0 8px;
  letter-spacing: 0.01em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1.067rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.sidebar nav {
  display: grid;
  gap: 2px;
}

.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-sidebar);
  padding: 10px 12px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.933rem;
  transition: all var(--transition-fast);
  position: relative;
}

.sidebar nav a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--color-primary);
  border-radius: 0 3px 3px 0;
  transition: height var(--transition-normal);
}

.sidebar nav a:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-sidebar-active);
}

.sidebar nav a.active {
  background: rgba(59, 130, 246, 0.15);
  color: #fff;
  font-weight: 600;
}

.sidebar nav a.active::before {
  height: 20px;
}

/* 工作区 */
.workspace {
  grid-column: 2;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* 顶栏 */
.topbar {
  height: 60px;
  background: var(--bg-topbar);
  border-bottom: 1px solid var(--border-color);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 9;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.95);
}

.topbar > div:first-child {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.067rem;
  color: var(--text-primary);
}

.account {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.account > span {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.867rem;
  padding: 4px 10px;
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
}

.account a {
  font-size: 0.867rem;
  font-weight: 500;
}

.link-button, .danger-link {
  border: 0;
  background: none;
  padding: 0;
  color: var(--color-primary);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.867rem;
  transition: color var(--transition-fast);
}

.danger-link {
  color: var(--color-danger);
}

.danger-link:hover {
  color: var(--color-danger-hover);
}

.menu-button {
  display: none;
  border: 0;
  background: none;
  font-size: 1.333rem;
  cursor: pointer;
  color: var(--text-primary);
  padding: 4px;
  border-radius: var(--radius-sm);
}

.menu-button:hover {
  background: var(--color-gray-100);
}

/* 内容区 */
.content {
  padding: 28px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
}

/* ============================================================
   组件：统计卡片
   ============================================================ */

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-gray-400);
  border-radius: 4px 0 0 4px;
  transition: background var(--transition-normal);
}

.stat.accent::before {
  background: linear-gradient(180deg, #3b82f6, #6366f1);
}

.stat:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-gray-300);
}

.stat span {
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat strong {
  display: block;
  font-size: 2rem;
  margin-top: 6px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat.accent strong {
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================================
   组件：面板 / 卡片
   ============================================================ */

.panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.panel.narrow {
  max-width: 760px;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color-light);
}

.panel-header h2 {
  margin: 0 0 4px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.panel-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
  line-height: 1.5;
}

.panel-header p.eyebrow {
  font-size: 0.733rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 6px;
}

/* ============================================================
   组件：按钮
   ============================================================ */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 8px 16px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.867rem;
  white-space: nowrap;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.button:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-400);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.button:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.3);
  outline-offset: 2px;
}

.button.primary {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  border-color: #2563eb;
  color: #fff;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.button.primary:hover {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  border-color: #1d4ed8;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
  color: #fff;
}

.button.danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  border-color: #dc2626;
  color: #fff;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.button.danger:hover {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
  border-color: #b91c1c;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
  color: #fff;
}

.button.compact {
  min-height: 34px;
  padding: 5px 10px;
  font-size: 0.8rem;
}

.button.full {
  width: 100%;
}

.button.cancel-button {
  background: var(--color-gray-50);
  color: var(--text-secondary);
}

/* ============================================================
   组件：提示
   ============================================================ */

.alert {
  padding: 12px 16px;
  border: 1px solid;
  margin-bottom: 18px;
  border-radius: var(--radius-md);
  font-size: 0.867rem;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.alert.success {
  background: var(--color-success-light);
  border-color: #a7f3d0;
  color: #065f46;
}

.alert.error {
  background: var(--color-danger-light);
  border-color: #fecaca;
  color: #991b1b;
}

.alert.warning {
  background: var(--color-warning-light);
  border-color: #fde68a;
  color: #92400e;
}

/* ============================================================
   组件：表单
   ============================================================ */

.form-stack {
  display: grid;
  gap: 18px;
}

.form-stack label {
  display: grid;
  gap: 6px;
  font-weight: 600;
  font-size: 0.867rem;
  color: var(--text-primary);
}

.form-stack input,
.form-stack select,
.form-stack textarea {
  width: 100%;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.933rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.form-stack input:hover,
.form-stack select:hover,
.form-stack textarea:hover {
  border-color: var(--color-gray-400);
}

.field-error {
  display: none;
  color: var(--color-danger);
  font-size: 0.8rem;
  font-weight: 500;
}

.field-error.visible {
  display: block;
}

.form-stack input:focus,
.form-stack select:focus,
.form-stack textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background: #fff;
}

.form-stack textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.6;
}

.form-stack small,
td small {
  font-weight: 400;
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.5;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-stack code {
  padding: 2px 6px;
  border-radius: 4px;
  background: #fef3c7;
  color: #92400e;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* 开关控件 */
.switch-field {
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--color-gray-50);
}

.switch-control {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 400;
}

.switch-control input {
  position: absolute;
  width: 1px !important;
  height: 1px;
  opacity: 0;
}

.switch-control > span {
  position: relative;
  flex: 0 0 46px;
  width: 46px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--color-gray-300);
  transition: background var(--transition-fast);
  cursor: pointer;
}

.switch-control > span::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast);
}

.switch-control input:checked + span {
  background: var(--color-primary);
}

.switch-control input:checked + span::after {
  transform: translateX(20px);
}

.switch-control input:focus-visible + span {
  outline: 3px solid rgba(59, 130, 246, 0.3);
  outline-offset: 2px;
}

/* 顶置按钮 */
.pin-toggle {
  min-width: 72px;
  min-height: 34px;
  padding: 6px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.pin-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pin-toggle.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary-hover);
  font-weight: 600;
}

.pinned-badge {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 7px;
  border-radius: 4px;
  background: #fef3c7;
  color: #92400e;
  font-size: 0.733rem;
  font-weight: 600;
  vertical-align: 1px;
}

.toggle-control {
  display: inline-flex !important;
  grid-template-columns: none !important;
  align-items: center;
  gap: 8px;
  font-weight: 400 !important;
  white-space: nowrap;
  cursor: pointer;
}

.toggle-control input {
  position: absolute;
  width: 1px !important;
  height: 1px;
  opacity: 0;
}

.toggle-track {
  position: relative;
  display: inline-block;
  flex: 0 0 40px;
  width: 40px;
  height: 22px;
  border-radius: 11px;
  background: var(--color-gray-300);
  transition: background var(--transition-fast);
}

.toggle-track::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast);
}

.toggle-control input:checked + .toggle-track {
  background: var(--color-primary);
}

.toggle-control input:checked + .toggle-track::after {
  transform: translateX(18px);
}

.toggle-control input:focus-visible + .toggle-track {
  outline: 3px solid rgba(59, 130, 246, 0.3);
  outline-offset: 2px;
}

.toggle-field {
  align-items: start;
}

.toggle-field > .toggle-control {
  width: max-content;
  max-width: 100%;
}

/* ============================================================
   组件：表格
   ============================================================ */

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color-light);
  vertical-align: middle;
}

th {
  background: var(--color-gray-50);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

tbody tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: var(--color-gray-50);
}

td strong, td small {
  display: block;
  max-width: 440px;
}

td strong {
  color: var(--text-primary);
  font-weight: 600;
}

.right {
  text-align: right;
  white-space: nowrap;
}

.url-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.empty {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 16px;
  font-size: 0.933rem;
}

/* 链接表格 */
.links-table {
  min-width: 980px;
}

.links-table td:nth-child(4) {
  min-width: 320px;
}

.sort-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.order-input {
  width: 100px;
  min-height: 36px;
  padding: 7px 9px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
}

.order-save {
  min-height: 34px;
  padding: 6px 12px;
}

.order-inline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* 状态徽章 */
.status-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 600;
}

.status-badge.published {
  background: var(--color-success-light);
  color: #065f46;
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 18px;
}

.pagination span {
  color: var(--text-secondary);
  font-size: 0.867rem;
}

/* ============================================================
   组件：仪表盘树形结构
   ============================================================ */

.tree {
  display: grid;
  gap: 20px;
}

.tree-root {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.tree-root:hover {
  box-shadow: var(--shadow-md);
}

.tree-heading {
  padding: 16px 20px;
  background: var(--color-gray-50);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--border-color-light);
}

.tree-heading h3,
.tree-heading h4 {
  margin: 0 0 4px;
  font-weight: 700;
  color: var(--text-primary);
}

.tree-heading h3 {
  font-size: 1.067rem;
}

.tree-heading h4 {
  font-size: 0.933rem;
}

.tree-heading span {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.tree-child {
  border-top: 1px solid var(--border-color-light);
  margin-left: 28px;
}

.tree-child > .tree-heading {
  background: var(--bg-surface);
  padding-left: 24px;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--border-color-light);
}

.link-item {
  background: var(--bg-surface);
  padding: 16px 18px;
  min-width: 0;
  transition: all var(--transition-fast);
  display: block;
  color: var(--text-primary);
}

.link-item:hover {
  background: var(--color-primary-light);
  box-shadow: inset 0 0 0 1px rgba(59, 130, 246, 0.2);
}

.link-item strong,
.link-item span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.link-item strong {
  color: var(--text-primary);
  margin-bottom: 6px;
  font-weight: 600;
}

.link-item span {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.muted {
  color: var(--text-muted);
  padding: 14px 20px;
  font-size: 0.867rem;
}

.row-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.row-actions a {
  font-size: 0.8rem;
  font-weight: 500;
}

.actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.inline {
  display: inline;
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* 搜索 */
.admin-search {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.admin-search label {
  flex: 1;
  max-width: 420px;
}

.admin-search input {
  width: 100%;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.admin-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ============================================================
   登录页
   ============================================================ */

.guest {
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 50%, #f1f5f9 100%);
}

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-content: center;
  padding: 20px;
}

.login-panel {
  width: min(420px, calc(100vw - 40px));
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 32px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

.login-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.login-heading h1 {
  font-size: 1.4rem;
  margin: 0 0 4px;
  font-weight: 700;
  color: var(--text-primary);
}

.login-heading p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
}

/* ============================================================
   密码强度指示器
   ============================================================ */

.password-strength {
  display: grid;
  gap: 6px;
  position: relative;
  padding-top: 4px;
}

.password-strength::before {
  content: "";
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-gray-200);
}

.password-strength span {
  position: absolute;
  left: 0;
  top: 4px;
  width: 0;
  height: 6px;
  border-radius: var(--radius-full);
  transition: width 0.3s ease, background 0.3s ease;
  background: var(--color-success);
}

.password-strength span[data-score="1"] {
  background: #ef4444;
  width: 25%;
}

.password-strength span[data-score="2"] {
  background: #f59e0b;
  width: 50%;
}

.password-strength span[data-score="3"] {
  background: #3b82f6;
  width: 75%;
}

.password-strength span[data-score="4"] {
  background: #10b981;
  width: 100%;
}

/* 日志 */
.log-result {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.733rem;
  font-weight: 600;
}

.log-result.success {
  background: var(--color-success-light);
  color: #065f46;
}

.log-result.failure {
  background: var(--color-danger-light);
  color: #991b1b;
}

/* ============================================================
   公共站点 - 首页
   ============================================================ */

.public-site {
  --navy: #0f172a;
  --blue: #3b82f6;
  --blue-soft: #eff6ff;
  --line: #e2e8f0;
  --muted: #64748b;
  background: #f8fafc;
  color: #1e293b;
}

.public-main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px 28px 64px;
}

/* 资源总览 */
.resource-overview {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  padding: 40px 44px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1e40af 100%);
  color: #fff;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.2);
}

.resource-overview::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -40px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.resource-overview::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  right: -100px;
  top: -160px;
  border: 50px solid rgba(255, 255, 255, 0.04);
  border-radius: 50%;
}

.overview-copy {
  position: relative;
  z-index: 1;
}

.overview-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.733rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #93c5fd;
}

.overview-copy h1 {
  margin: 0 0 10px;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.overview-copy p {
  margin: 0;
  color: #cbd5e1;
  font-size: 1rem;
  line-height: 1.6;
}

.resource-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(100px, 1fr));
  gap: 2px;
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.resource-stats div {
  padding: 18px 22px;
  text-align: center;
  background: rgba(15, 23, 42, 0.2);
  transition: background var(--transition-fast);
}

.resource-stats div:hover {
  background: rgba(15, 23, 42, 0.35);
}

.resource-stats dt {
  font-size: 0.733rem;
  color: #94a3b8;
  font-weight: 500;
}

.resource-stats dd {
  margin: 6px 0 0;
  font-size: 1.733rem;
  font-weight: 800;
  color: #fff;
}

/* 目录索引 */
.directory-index {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin: 24px 0;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.directory-index > span {
  flex: 0 0 auto;
  padding: 8px 0;
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.867rem;
}

.directory-index > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.directory-index a {
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.867rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.directory-index a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* 资源区域 */
.resource-section {
  scroll-margin-top: 92px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.05);
}

.resource-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color-light);
}

.category-title {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.category-marker {
  display: grid;
  place-items: center;
  flex: 0 0 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary-light), #dbeafe);
  color: var(--color-primary);
  font-size: 1.133rem;
  font-weight: 800;
}

.category-title > div {
  min-width: 0;
}

.category-title h2,
.resource-child-title h3 {
  margin: 0;
  color: var(--text-primary);
}

.category-title h2 {
  font-size: 1.2rem;
  font-weight: 700;
}

.category-title p,
.resource-child-title p {
  margin: 4px 0 0;
  color: var(--text-secondary);
  line-height: 1.55;
  font-size: 0.867rem;
}

.resource-count {
  flex: 0 0 auto;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 600;
}

.resource-group {
  padding-top: 20px;
}

.group-title {
  margin: 0 0 14px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.resource-child {
  margin-top: 24px;
  padding: 22px 22px 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: #fafbfd;
  transition: box-shadow var(--transition-fast);
}

.resource-child:hover {
  box-shadow: var(--shadow-md);
}

.resource-child-title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.resource-child-title h3 {
  font-size: 1rem;
}

.resource-child-title > span {
  display: grid;
  place-items: center;
  flex: 0 0 28px;
  height: 28px;
  border-radius: var(--radius-md);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
}

.resource-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr));
  gap: 12px;
}

.resource-link {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 14px;
  min-height: 92px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  text-decoration: none;
}

.resource-link:hover {
  border-color: #93c5fd;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.12);
  transform: translateY(-2px);
}

.link-avatar {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: linear-gradient(145deg, #eff6ff, #dbeafe);
  color: var(--color-primary-hover);
  font-weight: 700;
  font-size: 0.867rem;
}

.link-content {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.link-content strong,
.link-content span,
.link-content small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.link-content strong {
  font-size: 0.933rem;
  font-weight: 600;
}

.link-content span,
.link-content small {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.link-content small {
  color: var(--text-muted);
}

.link-arrow {
  color: var(--text-muted);
  font-size: 1.4rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.resource-link:hover .link-arrow {
  color: var(--color-primary);
  transform: translateX(2px);
}

.resource-empty {
  margin: 16px 0;
  color: var(--text-muted);
  font-size: 0.867rem;
}

.public-empty {
  display: grid;
  gap: 8px;
  margin-top: 24px;
  padding: 56px;
  text-align: center;
  border: 2px dashed var(--color-gray-300);
  border-radius: var(--radius-xl);
  background: #fff;
  color: var(--text-muted);
}

.public-empty strong {
  font-size: 1.133rem;
  color: var(--text-primary);
}

/* 目录导航面板 */
.navigation-panel,
.navigation-section {
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: #fff;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.05);
  overflow: hidden;
}

.navigation-header,
.navigation-section > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color-light);
  background: #fafbfc;
}

.navigation-header h2,
.navigation-section h2 {
  margin: 0 0 4px;
  color: var(--text-primary);
  font-size: 1.133rem;
  font-weight: 700;
}

.navigation-header p,
.navigation-section header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
}

.navigation-search {
  width: min(100%, 320px);
}

.navigation-search input {
  width: 100%;
  height: 42px;
  padding: 0 14px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  outline: 0;
  background: #fff;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.navigation-search input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.directory-navigation-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
}

.directory-navigation-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  min-height: 120px;
  padding: 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: #fff;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  text-decoration: none;
}

.directory-navigation-item:hover,
.directory-navigation-item:focus-visible {
  border-color: #93c5fd;
  background: #f8faff;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.1);
  transform: translateY(-2px);
  outline: 0;
}

.directory-navigation-copy {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.directory-navigation-copy strong {
  font-size: 1.067rem;
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.directory-navigation-copy small {
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.directory-navigation-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  grid-column: 1;
}

.directory-navigation-meta span {
  padding: 5px 10px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 500;
}

.directory-navigation-action {
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: center;
  padding: 9px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.directory-navigation-item:hover .directory-navigation-action {
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.navigation-no-results {
  margin: 0;
  padding: 48px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.933rem;
}

.directory-navigation-item[hidden],
.navigation-no-results[hidden] {
  display: none;
}

/* 面包屑 */
.page-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  margin-bottom: 16px;
  color: var(--text-muted);
  font-size: 0.867rem;
  overflow-x: auto;
  white-space: nowrap;
}

.page-breadcrumb a {
  color: var(--text-secondary);
  font-weight: 500;
}

.page-breadcrumb a:hover {
  color: var(--color-primary);
}

.page-breadcrumb [aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

/* 目录页头部 */
.directory-page-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 32px 36px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1e40af 100%);
  color: #fff;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.18);
}

.directory-page-heading h1 {
  margin: 8px 0 6px;
  font-size: clamp(1.6rem, 3vw, 2.067rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.directory-page-heading p {
  max-width: 760px;
  margin: 0;
  color: #cbd5e1;
  line-height: 1.65;
  font-size: 0.933rem;
  overflow-wrap: anywhere;
}

.back-navigation {
  flex: 0 0 auto;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  white-space: nowrap;
  font-weight: 500;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.back-navigation:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.navigation-section > header > span {
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 600;
}

.page-link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
}

.page-link-item {
  display: flex;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
  min-height: 84px;
  padding: 16px 18px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  text-decoration: none;
}

.page-link-item:hover,
.page-link-item:focus-visible {
  border-color: #93c5fd;
  background: #f8faff;
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.08);
  outline: 0;
  transform: translateY(-1px);
}

.page-link-item strong,
.page-link-item small {
  overflow-wrap: anywhere;
}

.page-link-item strong {
  font-size: 0.933rem;
  font-weight: 600;
  line-height: 1.45;
}

.page-link-item small {
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.55;
}

.compact-empty {
  margin: 14px;
  padding: 36px;
}

.child-navigation-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* ============================================================
   视频教程首页入口卡片
   ============================================================ */

.home-tutorial-promo {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(270px, 340px);
  align-items: center;
  gap: 36px;
  margin-top: 24px;
  padding: 32px 36px;
  overflow: hidden;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #fff 0%, #eff6ff 50%, #f0f9ff 100%);
  box-shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
}

.home-tutorial-promo::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -120px;
  width: 260px;
  height: 260px;
  border: 38px solid rgba(59, 130, 246, 0.04);
  border-radius: 50%;
  pointer-events: none;
}

.home-tutorial-promo-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.home-tutorial-promo .overview-label {
  margin-bottom: 8px;
  color: var(--color-primary);
}

.home-tutorial-promo h2 {
  margin: 0 0 10px;
  color: var(--text-primary);
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.home-tutorial-promo p {
  max-width: 650px;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.933rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.home-tutorial-benefits {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-primary);
  font-size: 0.867rem;
}

.home-tutorial-benefits li {
  position: relative;
  padding-left: 20px;
  line-height: 1.55;
  font-weight: 500;
}

.home-tutorial-benefits li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 5px rgba(59, 130, 246, 0.15);
}

.tutorial-home-button {
  position: relative;
  z-index: 1;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: min(100%, 320px);
  min-height: 68px;
  padding: 14px 24px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: #fff;
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.35);
  transition: all var(--transition-normal);
  text-decoration: none;
  text-align: center;
  flex-direction: column;
}

.tutorial-home-button:hover {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  box-shadow: 0 16px 36px rgba(37, 99, 235, 0.45);
  transform: translateY(-2px);
}

.tutorial-home-button:active {
  transform: translateY(0);
}

.tutorial-home-button .button-primary-text {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.tutorial-home-button .button-secondary-text {
  color: #bfdbfe;
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

/* 按钮组：并排布局 */
.tutorial-button-group {
  position: relative;
  z-index: 1;
  justify-self: end;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  width: min(100%, 320px);
}

/* 查询卡密按钮：与教程按钮样式一致 */
.tutorial-query-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: min(100%, 320px);
  min-height: 68px;
  padding: 14px 24px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff;
  box-shadow: 0 10px 24px rgba(99, 102, 241, 0.3);
  transition: all var(--transition-normal);
  text-decoration: none;
  text-align: center;
  flex-direction: column;
}

.tutorial-query-button:hover {
  background: linear-gradient(135deg, #4f46e5, #4338ca);
  color: #fff;
  box-shadow: 0 14px 32px rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
}

.tutorial-query-button:active {
  transform: translateY(0);
}

.tutorial-query-button .button-primary-text {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.tutorial-query-button .button-secondary-text {
  color: #bfdbfe;
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

/* 富文本内容 */
.home-rich-content {
  margin-top: 24px;
  padding: 24px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.05);
  line-height: 1.8;
  color: var(--text-primary);
}

.home-rich-content h2,
.home-rich-content h3 {
  color: var(--text-primary);
  margin-top: 1.2em;
  margin-bottom: 0.5em;
}

.home-rich-content p {
  margin: 0 0 10px;
}

/* ============================================================
   目录树（公开站点）
   ============================================================ */

.directory-tree {
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: #fff;
  box-shadow: 0 10px 36px rgba(15, 23, 42, 0.06);
  overflow: hidden;
}

.directory-tree-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
  background: #fafbfc;
}

.directory-tree-header h2 {
  margin: 0 0 4px;
  font-size: 1.133rem;
  font-weight: 700;
  color: var(--text-primary);
}

.directory-tree-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
}

.directory-tree-header > span {
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 600;
}

.tree-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, 420px) minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  padding: 16px 28px;
  border-bottom: 1px solid var(--border-color-light);
  background: #fff;
}

.tree-search {
  position: relative;
  display: flex;
  align-items: center;
}

.tree-search input {
  width: 100%;
  height: 44px;
  padding: 0 52px 0 44px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  outline: 0;
  background: #f8fafc;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.tree-search input:focus {
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.tree-search input::-webkit-search-cancel-button {
  display: none;
}

.search-icon {
  position: absolute;
  left: 16px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--text-secondary);
  border-radius: 50%;
  pointer-events: none;
}

.search-icon::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 2px;
  right: -5px;
  bottom: -2px;
  background: var(--text-secondary);
  transform: rotate(45deg);
}

.tree-search kbd {
  position: absolute;
  right: 10px;
  padding: 3px 6px;
  border: 1px solid var(--color-gray-300);
  border-radius: 4px;
  background: #fff;
  color: var(--text-muted);
  font: 10px var(--font-sans);
}

.tree-breadcrumb {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  min-width: 0;
  color: var(--text-secondary);
}

.tree-breadcrumb button {
  border: 0;
  background: none;
  padding: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.tree-breadcrumb button:hover,
.tree-breadcrumb button[aria-current="page"] {
  color: var(--color-primary);
}

.breadcrumb-current {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.breadcrumb-current i {
  margin: 0 8px;
  color: var(--color-gray-300);
  font-style: normal;
}

.directory-tree-list {
  padding: 12px;
}

.directory-tree .tree-root {
  margin: 0;
  border: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.directory-tree .tree-root + .tree-root {
  margin-top: 8px;
}

/* 树形触发器（无 JS details/summary 回退） */
.tree-root-trigger,
.tree-child-trigger {
  width: 100%;
  border: 0;
  font: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
}

.tree-root-trigger {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: clamp(10px, 2vw, 24px);
  padding: clamp(12px, 1.5vw, 18px) clamp(14px, 2vw, 24px);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  background: transparent;
  transition: all var(--transition-normal);
}

.tree-root-trigger:hover {
  background: #f8fafc;
  border-color: var(--border-color);
}

.tree-root[data-expanded="true"] > .tree-root-trigger,
.tree-root.is-current > .tree-root-trigger {
  border-color: #bfdbfe;
  background: #eff6ff;
  box-shadow: inset 4px 0 var(--color-primary);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.tree-root.is-search-match > .tree-root-trigger {
  background: #fffbeb;
  border-color: #fde68a;
}

.tree-root-trigger:focus-visible,
.tree-child-trigger:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.25);
  outline-offset: -3px;
}

.tree-state {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  min-height: 34px;
  padding: 6px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: #f8fafc;
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tree-root[data-expanded="true"] > .tree-root-trigger .tree-state,
.tree-child-group[data-expanded="true"] > .tree-child-trigger .tree-state {
  border-color: #93c5fd;
  background: #dbeafe;
  color: var(--color-primary-hover);
}

.tree-root-copy {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.tree-root-copy strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tree-root-copy small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.tree-root-meta {
  display: flex;
  gap: 8px;
}

.tree-root-meta span {
  padding: 5px 10px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--text-secondary);
  font-size: 0.733rem;
  white-space: nowrap;
}

/* 树形内容区 */
.tree-root-content,
.tree-child-content {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  transition: grid-template-rows 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tree-root[data-expanded="true"] > .tree-root-content,
.tree-child-group[data-expanded="true"] > .tree-child-content {
  grid-template-rows: 1fr;
}

.tree-root[data-expanded="false"] > .tree-root-content,
.tree-child-group[data-expanded="false"] > .tree-child-content {
  visibility: hidden;
  transition: grid-template-rows 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0s linear 0.3s;
}

.tree-root[data-expanded="true"] > .tree-root-content,
.tree-child-group[data-expanded="true"] > .tree-child-content {
  visibility: visible;
}

.tree-root-content {
  margin-left: clamp(14px, 3vw, 42px);
}

.tree-content-inner {
  min-height: 0;
  overflow: hidden;
  padding: 20px 20px 20px clamp(16px, 3vw, 32px);
  border-left: 2px solid #bfdbfe;
  background: #fbfdff;
}

.tree-child-group {
  position: relative;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #fff;
  cursor: default;
  transition: all var(--transition-fast);
}

.tree-child-group::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 3vw, 34px));
  top: 28px;
  width: clamp(18px, 3vw, 34px);
  border-top: 2px solid #bfdbfe;
}

.tree-child-group + .tree-child-group {
  margin-top: 12px;
}

.tree-child-group:hover {
  border-color: #93c5fd;
  box-shadow: var(--shadow-sm);
}

.tree-child-group.is-selected {
  border-color: #93c5fd;
  background: #f8faff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.08);
}

.tree-child-trigger {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: clamp(9px, 1.5vw, 18px);
  padding: clamp(11px, 1.3vw, 16px) clamp(12px, 1.8vw, 20px);
  border-radius: var(--radius-md);
  background: #fff;
  transition: background var(--transition-fast);
}

.tree-child-trigger:hover {
  background: #f8faff;
}

.tree-child-group[data-expanded="true"] > .tree-child-trigger,
.tree-child-group.is-selected > .tree-child-trigger {
  background: #f0f6ff;
}

.tree-child-copy {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.tree-child-copy strong,
.tree-child-copy small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-child-copy strong {
  color: var(--text-primary);
  font-size: 0.933rem;
  font-weight: 600;
}

.tree-child-copy small {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.tree-child-content-inner {
  min-height: 0;
  overflow: hidden;
  padding: 0 14px;
}

.tree-child-group[data-expanded="true"] .tree-child-content-inner {
  padding-bottom: 16px;
}

.tree-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tree-child-content .tree-links {
  padding-left: clamp(8px, 2vw, 24px);
}

.tree-links a {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  min-height: 56px;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #f8fafc;
  color: var(--text-primary);
  font-size: 0.867rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.tree-links a:hover,
.tree-links a:focus-visible {
  border-color: #93c5fd;
  background: #eff6ff;
  color: var(--color-primary-hover);
  outline: 0;
  transform: translateY(-1px);
}

.tree-links a strong,
.tree-links a small {
  display: block;
  width: 100%;
  overflow-wrap: anywhere;
}

.tree-links a strong {
  color: inherit;
  font-size: 0.867rem;
  line-height: 1.45;
}

.tree-links a small {
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 400;
  line-height: 1.5;
}

.tree-links a:hover small,
.tree-links a:focus-visible small {
  color: #5274a6;
}

.tree-empty {
  margin: 0;
  padding: 12px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.tree-no-results {
  margin: 0;
  padding: 48px 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.933rem;
}

.tree-root[hidden],
.tree-no-results[hidden],
.breadcrumb-current[hidden],
.tree-child-group[hidden] {
  display: none;
}

/* ============================================================
   视频教程页面
   ============================================================ */

.tutorial-page-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 32px 36px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1e40af 100%);
  color: #fff;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.18);
}

.tutorial-page-heading h1 {
  margin: 8px 0 6px;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.tutorial-page-heading p {
  margin: 0;
  color: #cbd5e1;
  font-size: 0.933rem;
}

.tutorial-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(300px, 0.8fr);
  align-items: start;
  gap: 24px;
  margin-top: 24px;
}

.tutorial-workspace .tutorial-player-section,
.tutorial-workspace .tutorial-list-section {
  margin-top: 0;
}

.tutorial-player-section {
  scroll-margin-top: 24px;
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
}

.tutorial-player-section:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.25);
  outline-offset: 3px;
}

.tutorial-video-stage {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #080b0f;
}

.tutorial-player-section video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 0;
}

.tutorial-player-copy {
  margin: 0;
  padding: 20px 24px 24px;
  min-width: 0;
}

.tutorial-player-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.tutorial-player-status,
.tutorial-duration-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 10px;
  border-radius: var(--radius-full);
  font-size: 0.733rem;
  font-weight: 700;
  line-height: 1.2;
}

.tutorial-player-status {
  background: #eff6ff;
  color: var(--color-primary-hover);
}

.tutorial-duration-badge {
  border: 1px solid var(--border-color);
  background: #f8fafc;
  color: var(--text-secondary);
}

.tutorial-player-copy > span {
  display: inline-block;
  margin-bottom: 4px;
  color: var(--color-primary);
  font-size: 0.733rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tutorial-player-copy h2 {
  max-width: 32ch;
  margin: 0 0 10px;
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  overflow-wrap: anywhere;
}

.tutorial-player-copy p {
  max-width: 68ch;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.933rem;
  line-height: 1.75;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.tutorial-player-copy p[hidden] {
  display: none;
}

.tutorial-source-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 12px;
  padding: 8px 0;
  font-weight: 600;
  color: var(--color-primary);
  max-width: 100%;
  overflow-wrap: anywhere;
  text-decoration: none;
}

.tutorial-source-link:hover {
  color: var(--color-primary-hover);
}

.tutorial-source-link:focus-visible {
  border-radius: 4px;
  outline: 3px solid rgba(59, 130, 246, 0.25);
  outline-offset: 2px;
}

.tutorial-list-section {
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.05);
}

.tutorial-list-section > header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
  background: #fafbfc;
}

.tutorial-list-section h2 {
  margin: 0 0 4px;
  font-size: 1.133rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tutorial-list-section header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
}

.tutorial-card-list {
  display: grid;
  gap: 8px;
  padding: 12px;
}

.tutorial-card {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 92px;
  padding: 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-normal);
  font-family: inherit;
}

.tutorial-card:hover {
  border-color: #93c5fd;
  background: #f8faff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.tutorial-card:focus-visible {
  border-color: var(--color-primary);
  outline: 3px solid rgba(59, 130, 246, 0.25);
  outline-offset: 2px;
}

.tutorial-card:active {
  transform: translateY(0);
}

.tutorial-card.active {
  border-color: #93c5fd;
  background: #eff6ff;
  box-shadow: inset 3px 0 var(--color-primary);
}

.tutorial-card-number {
  align-self: start;
  padding-top: 4px;
  color: var(--text-muted);
  font-size: 0.733rem;
  font-weight: 700;
}

.tutorial-card-copy {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.tutorial-card-copy strong,
.tutorial-card-copy small {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.tutorial-card-copy strong {
  color: var(--text-primary);
  font-size: 0.933rem;
  font-weight: 600;
  line-height: 1.45;
}

.tutorial-card-copy small {
  display: -webkit-box;
  overflow: hidden;
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.5;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.tutorial-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.733rem;
  min-width: 0;
}

.tutorial-card-state {
  color: var(--text-secondary);
  font-weight: 600;
  white-space: nowrap;
  padding: 3px 0;
}

.tutorial-card.active .tutorial-card-state {
  color: var(--color-primary-hover);
}

.tutorial-card-duration {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  width: max-content;
  max-width: 100%;
  padding: 3px 8px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: #f8fafc;
  color: var(--text-secondary);
  font-weight: 700;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.tutorial-card-play {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: #eff6ff;
  color: var(--color-primary);
  transition: all var(--transition-fast);
}

.tutorial-card.active .tutorial-card-play {
  background: var(--color-primary);
  color: #fff;
}

.tutorial-card-play > span {
  width: 0;
  height: 0;
  margin-left: 3px;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 9px solid currentColor;
}

.tutorial-public-table {
  min-width: 620px;
}

.tutorial-public-table td:first-child {
  max-width: 700px;
}

.tutorial-play-button {
  color: var(--color-primary);
  border-color: #93c5fd;
}

.tutorial-empty {
  margin-top: 24px;
}

/* ============================================================
   视频教程：下载页面
   ============================================================ */

.tutorial-download-page {
  min-width: 0;
  max-width: 780px;
  margin: 0 auto;
  padding: 48px 0 80px;
}

/* 下载页：极简设计 — 仅视频名称 + 下载按钮，居中大间距布局 */
.tutorial-download-heading {
  text-align: center;
  margin-bottom: 44px;
  padding: 0 20px;
}

.tutorial-download-heading h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #0f172a;
  line-height: 1.15;
}

.tutorial-download-heading p {
  margin: 0;
  color: #94a3b8;
  font-size: 1rem;
  font-weight: 500;
}

.tutorial-download-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin-top: 16px;
  padding: 8px 20px;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  background: #fff;
  color: #64748b;
  font-weight: 600;
  font-size: 0.867rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.tutorial-download-home:hover {
  background: #f8fafc;
  color: #0f172a;
  border-color: #94a3b8;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.tutorial-download-list {
  display: grid;
  gap: 1px;
  padding: 0 16px;
}

.tutorial-download-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: #fff;
  border: 1px solid #e8ecf1;
  border-radius: 0;
  transition: all 0.2s ease;
}

.tutorial-download-item:first-child {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.tutorial-download-item:last-child {
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.tutorial-download-item:only-child {
  border-radius: var(--radius-lg);
}

.tutorial-download-item:hover {
  background: #fafbfc;
  border-color: #d0d5dd;
  z-index: 1;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.tutorial-download-item[hidden] {
  display: none;
}

.tutorial-download-index {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #f1f5f9;
  color: #94a3b8;
  font-size: 0.867rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.tutorial-download-title {
  margin: 0;
  font-size: 1.067rem;
  font-weight: 600;
  color: #0f172a;
  line-height: 1.5;
  overflow-wrap: anywhere;
  min-width: 0;
}

.tutorial-download-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 110px;
  min-height: 44px;
  padding: 10px 22px;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  background: #fff;
  color: #334155;
  font-weight: 600;
  font-size: 0.867rem;
  white-space: nowrap;
  transition: all 0.2s ease;
  text-decoration: none;
  flex-shrink: 0;
}

.tutorial-download-link:hover {
  background: #0f172a;
  color: #fff;
  border-color: #0f172a;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.2);
  transform: translateY(-1px);
}

.tutorial-download-link:focus-visible {
  outline: 3px solid rgba(15, 23, 42, 0.2);
  outline-offset: 3px;
}

.tutorial-download-link:active {
  transform: translateY(0);
  background: #1e293b;
  border-color: #1e293b;
}

/* 空状态 */
.tutorial-download-empty {
  display: grid;
  justify-items: center;
  gap: 12px;
  padding: 80px 20px;
  text-align: center;
  color: #94a3b8;
}

.tutorial-download-empty-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 8px;
  border: 2px dashed #cbd5e1;
  border-radius: 50%;
}

.tutorial-download-empty strong {
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
}

.tutorial-download-empty span {
  color: #64748b;
  font-size: 0.933rem;
}

.tutorial-download-empty a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 8px;
  padding: 10px 22px;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  background: #fff;
  color: #334155;
  font-weight: 600;
  font-size: 0.867rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.tutorial-download-empty a:hover {
  background: #0f172a;
  color: #fff;
  border-color: #0f172a;
}

.tutorial-download-empty a:focus-visible {
  outline: 3px solid rgba(15, 23, 42, 0.2);
  outline-offset: 3px;
}

/* ============================================================
   视频教程：管理后台
   ============================================================ */

.tutorial-admin-table {
  min-width: 900px;
}

.tutorial-admin-table th a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.tutorial-admin-table th a:hover,
.tutorial-admin-table th a:focus-visible {
  color: var(--color-primary);
}

.tutorial-title-cell {
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tutorial-editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.85fr);
  align-items: start;
  gap: 24px;
}

.tutorial-live-preview {
  position: sticky;
  top: 86px;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #f8fafc;
}

.tutorial-preview-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.tutorial-preview-heading h3 {
  margin: 0;
  font-size: 1.133rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tutorial-preview-video {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #111820;
  border-radius: var(--radius-md);
}

.tutorial-preview-video video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tutorial-preview-video video[hidden] {
  display: none;
}

.tutorial-preview-video p {
  margin: 0;
  padding: 16px;
  color: #cbd5e1;
  text-align: center;
  line-height: 1.6;
}

.tutorial-preview-video p[hidden] {
  display: none;
}

.preview-message {
  display: block;
  overflow-wrap: anywhere;
}

.tutorial-preview-copy {
  padding-top: 16px;
}

.tutorial-preview-copy h4 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
  color: var(--text-primary);
}

.tutorial-preview-copy p {
  min-height: 44px;
  margin: 0 0 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.tutorial-preview-copy > span {
  color: var(--text-secondary);
  font-size: 0.867rem;
}

.tutorial-preview-copy strong {
  color: var(--text-primary);
}

.tutorial-detail-stage {
  overflow: hidden;
  aspect-ratio: 16 / 9;
  margin-bottom: 24px;
  border-radius: var(--radius-md);
  background: #111820;
}

.tutorial-detail-stage video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tutorial-detail-content h3 {
  margin: 18px 0 10px;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
  color: var(--text-primary);
}

.tutorial-detail-content > p {
  margin: 0 0 22px;
  color: var(--text-secondary);
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.tutorial-detail-summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-secondary);
}

.tutorial-detail-danger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--border-color);
}

.tutorial-detail-danger strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.tutorial-detail-danger p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
}

.delete-summary {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  margin: 0 0 24px;
  border-top: 1px solid var(--border-color);
}

.delete-summary dt,
.delete-summary dd {
  margin: 0;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color-light);
  overflow-wrap: anywhere;
}

.delete-summary dt {
  font-weight: 700;
  background: var(--color-gray-50);
  color: var(--text-secondary);
}

.delete-summary dd {
  color: var(--text-primary);
}

.detail-list {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  margin: 0;
  border-top: 1px solid var(--border-color);
}

.detail-list dt,
.detail-list dd {
  margin: 0;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color-light);
  overflow-wrap: anywhere;
}

.detail-list dt {
  font-weight: 700;
  background: var(--color-gray-50);
  color: var(--text-secondary);
}

.detail-list dd {
  white-space: pre-wrap;
  color: var(--text-primary);
}

.tutorial-form-panel .button,
.tutorial-list-panel .button,
.tutorial-detail-page .button,
.tutorial-delete-panel .button {
  min-height: 44px;
}

.tutorial-list-panel .button.compact {
  padding: 8px 12px;
}

.tutorial-edit-form input:focus-visible,
.tutorial-edit-form textarea:focus-visible,
.tutorial-edit-form select:focus-visible,
.tutorial-form-panel .button:focus-visible,
.tutorial-list-panel .button:focus-visible,
.tutorial-detail-page .button:focus-visible,
.tutorial-delete-panel .button:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.25);
  outline-offset: 2px;
}

/* ============================================================
   设置页面
   ============================================================ */

.settings-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  align-items: start;
  gap: 24px;
}

.settings-side {
  display: grid;
  gap: 24px;
}

.settings-three-columns {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.rich-editor-field {
  display: grid;
  gap: 8px;
}

.field-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.867rem;
}

.rich-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--color-gray-300);
  border-bottom: 0;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  background: var(--color-gray-50);
}

.rich-toolbar button,
.rich-toolbar select,
.color-tool {
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.rich-toolbar button:hover,
.rich-toolbar select:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-400);
}

.color-tool {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.733rem;
  cursor: default;
}

.color-tool input {
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  cursor: pointer;
}

.rich-editor {
  min-height: 220px;
  padding: 14px;
  border: 1px solid var(--color-gray-300);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: #fff;
  line-height: 1.7;
  outline: 0;
  transition: all var(--transition-fast);
}

.rich-editor:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.rich-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--text-muted);
}

.operation-log-panel {
  margin-top: 24px;
}

.access-text-settings-panel {
  margin-top: 24px;
}

.access-text-editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  align-items: start;
  gap: 24px;
}

.access-live-preview {
  position: sticky;
  top: 86px;
  padding: 18px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #f1f5f9;
}

.preview-caption {
  display: block;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 0.733rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.access-live-preview .login-panel {
  width: 100%;
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.1);
}

.access-help-text {
  display: block;
  margin-top: -6px;
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.8rem;
}

.public-main > .alert {
  max-width: 1240px;
  margin: 0 auto 20px;
}

.access-wrap > .alert {
  width: min(420px, calc(100vw - 40px));
  margin: 0 auto 16px;
}

.preview-panel {
  max-width: 1100px;
  margin: auto;
}

.preview-directory-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  color: var(--text-primary);
}

.preview-directory-card span {
  padding: 8px 14px;
  border-radius: var(--radius-md);
  background: #eff6ff;
  color: var(--color-primary-hover);
  font-weight: 600;
}

/* 教程卡片设置 */
.tutorial-card-settings {
  display: grid;
  gap: 18px;
  margin-top: 4px;
  padding: 22px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--color-gray-50);
}

.settings-group-heading h3 {
  margin: 0 0 5px;
  font-size: 1.133rem;
  font-weight: 700;
  color: var(--text-primary);
}

.settings-group-heading p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.867rem;
}

.tutorial-card-settings-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  align-items: start;
  gap: 20px;
}

.tutorial-card-fields {
  min-width: 0;
}

.tutorial-card-live-preview {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #f1f5f9;
}

.tutorial-card-live-preview .home-tutorial-promo {
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 0;
  padding: 22px;
  border-radius: var(--radius-md);
}

.tutorial-card-live-preview .home-tutorial-promo .tutorial-button-group {
  justify-self: stretch;
  width: 100%;
  max-width: none;
}

.tutorial-card-live-preview .tutorial-home-button,
.tutorial-card-live-preview .tutorial-query-button {
  pointer-events: none;
  cursor: default;
}

.tutorial-card-live-preview .tutorial-home-button:hover,
.tutorial-card-live-preview .tutorial-query-button:hover {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.35);
  transform: none;
}

.tutorial-card-live-preview .tutorial-query-button:hover {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 10px 24px rgba(99, 102, 241, 0.3);
}

.tutorial-card-live-preview .home-tutorial-promo-copy,
.tutorial-card-live-preview .home-tutorial-promo-copy *,
.preview-panel .home-tutorial-promo-copy,
.preview-panel .home-tutorial-promo-copy * {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.preview-panel .home-tutorial-promo .tutorial-button-group {
  cursor: default;
}

.preview-panel .home-tutorial-promo .tutorial-home-button,
.preview-panel .home-tutorial-promo .tutorial-query-button {
  cursor: default;
}

.preview-panel .home-tutorial-promo .tutorial-home-button:hover,
.preview-panel .home-tutorial-promo .tutorial-query-button:hover {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.35);
  transform: none;
}

.preview-panel .home-tutorial-promo .tutorial-query-button:hover {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 10px 24px rgba(99, 102, 241, 0.3);
}

.access-screen {
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 50%, #f1f5f9 100%);
}

.access-wrap {
  min-height: 100vh;
  display: grid;
  place-content: center;
  padding: 20px;
}

.access-panel {
  width: min(420px, calc(100vw - 40px));
}

/* ============================================================
   响应式 - 平板 (max-width: 1000px)
   ============================================================ */

@media (max-width: 1000px) {
  .settings-grid {
    grid-template-columns: 1fr;
  }

  .settings-three-columns {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
}

@media (max-width: 900px) {
  .tutorial-workspace {
    grid-template-columns: 1fr;
  }

  .tutorial-card-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tutorial-editor-layout {
    grid-template-columns: 1fr;
  }

  .tutorial-live-preview {
    position: static;
  }

  .page-link-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .directory-navigation-grid {
    grid-template-columns: 1fr;
  }

  .home-tutorial-promo {
    grid-template-columns: minmax(0, 1fr) minmax(250px, 300px);
    gap: 24px;
  }

  .resource-overview {
    align-items: flex-start;
    flex-direction: column;
  }

  .resource-stats {
    width: 100%;
  }

  .resource-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tutorial-detail-danger {
    align-items: flex-start;
    flex-direction: column;
  }

  .tutorial-card-settings-layout {
    grid-template-columns: 1fr;
  }

  .tutorial-card-live-preview {
    max-width: 680px;
  }

  .access-text-editor-layout {
    grid-template-columns: 1fr;
  }

  .access-live-preview {
    position: static;
    max-width: 560px;
  }
}

/* ============================================================
   响应式 - 移动端 (max-width: 800px)
   ============================================================ */

@media (max-width: 800px) {
  .app-shell {
    display: block;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 20;
    box-shadow: 8px 0 24px rgba(0, 0, 0, 0.2);
  }

  .nav-open .sidebar {
    transform: translateX(0);
  }

  .workspace {
    display: block;
  }

  .menu-button {
    display: inline-block;
    margin-right: 10px;
  }

  .topbar {
    padding: 0 16px;
  }

  .account > span {
    display: none;
  }

  .content {
    padding: 16px;
  }

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

  .panel {
    padding: 18px;
  }

  .panel-header,
  .tree-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .tree-child {
    margin-left: 16px;
  }

  .login-wrap {
    padding: 16px;
  }

  .login-panel {
    width: min(100%, 420px);
    padding: 24px;
  }

  .form-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .form-actions .button {
    width: 100%;
    min-height: 44px;
  }

  .order-inline {
    min-width: 280px;
  }

  .tutorial-admin-table {
    min-width: 0;
  }

  .tutorial-admin-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .tutorial-admin-table,
  .tutorial-admin-table tbody,
  .tutorial-admin-table tr,
  .tutorial-admin-table td {
    display: block;
    width: 100%;
  }

  .tutorial-admin-table tr {
    margin-bottom: 14px;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #fff;
  }

  .tutorial-admin-table td {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 10px;
    padding: 8px 0;
    border: 0;
    text-align: left;
    white-space: normal;
  }

  .tutorial-admin-table td::before {
    content: attr(data-label);
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 0.8rem;
  }

  .tutorial-admin-table td[data-label="操作"] {
    display: flex;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color-light);
  }

  .tutorial-admin-table td[data-label="操作"]::before {
    display: none;
  }

  .tutorial-admin-table .row-actions .button {
    flex: 1 1 100px;
  }

  .tutorial-admin-table .url-text {
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .tutorial-detail-stage {
    margin-bottom: 18px;
  }

  .tutorial-detail-content h3 {
    font-size: 1.2rem;
  }

  .delete-summary {
    grid-template-columns: 1fr;
  }

  .delete-summary dt {
    padding-bottom: 4px;
    border-bottom: 0;
  }

  .delete-summary dd {
    padding-top: 4px;
  }

  .tutorial-detail-danger {
    margin-top: 20px;
  }

  .tutorial-detail-danger .button {
    width: 100%;
  }
}

/* ============================================================
   响应式 - 小屏 (max-width: 700px)
   ============================================================ */

@media (max-width: 700px) {
  .public-main {
    padding: 16px 14px 40px;
  }

  .resource-overview {
    padding: 28px 24px;
    border-radius: var(--radius-lg);
  }

  .overview-copy h1 {
    font-size: 1.6rem;
  }

  .resource-stats div {
    padding: 14px 12px;
  }

  .resource-stats dd {
    font-size: 1.333rem;
  }

  .directory-index {
    display: block;
    margin: 16px 0;
    padding: 14px;
  }

  .directory-index > span {
    display: block;
    padding: 0 0 10px;
  }

  .directory-index > div {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .directory-index a {
    flex: 0 0 auto;
  }

  .resource-section {
    padding: 20px 16px;
    border-radius: var(--radius-lg);
  }

  .resource-section-header {
    align-items: flex-start;
  }

  .resource-links {
    grid-template-columns: 1fr;
  }

  .resource-child {
    padding: 18px 14px 4px;
  }

  .resource-link {
    min-height: 84px;
  }

  .category-title p,
  .resource-child-title p {
    overflow-wrap: anywhere;
  }

  .navigation-panel,
  .navigation-section {
    margin-top: 16px;
    border-radius: var(--radius-lg);
  }

  .navigation-header,
  .navigation-section > header {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .navigation-search {
    width: 100%;
  }

  .directory-navigation-grid,
  .page-link-grid {
    grid-template-columns: 1fr;
    padding: 8px;
  }

  .directory-navigation-item {
    min-height: 108px;
    padding: 16px;
  }

  .directory-navigation-action {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .directory-page-heading {
    align-items: flex-start;
    flex-direction: column;
    padding: 24px 20px;
  }

  .back-navigation {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .page-breadcrumb {
    margin-bottom: 12px;
    padding-bottom: 4px;
  }

  .page-link-item {
    min-height: 78px;
    padding: 14px;
  }

  .compact-empty {
    padding: 28px 16px;
  }

  .home-tutorial-promo {
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 16px;
    padding: 24px 20px;
    border-radius: var(--radius-lg);
  }

  .home-tutorial-benefits {
    display: grid;
    gap: 10px;
  }

  .home-tutorial-promo .tutorial-button-group {
    justify-self: stretch;
    width: 100%;
    grid-template-columns: 1fr;
  }

  .home-tutorial-promo .tutorial-home-button,
  .home-tutorial-promo .tutorial-query-button {
    justify-self: stretch;
    width: 100%;
    min-height: 68px;
    box-sizing: border-box;
  }

  .tutorial-workspace {
    gap: 16px;
    margin-top: 16px;
  }

  .tutorial-player-copy {
    padding: 18px 16px 20px;
  }

  .tutorial-card-list {
    grid-template-columns: 1fr;
    padding: 8px;
  }

  .tutorial-card {
    min-height: 96px;
  }

  .tutorial-card-play {
    width: 44px;
    height: 44px;
  }

  .tutorial-card-meta {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .tutorial-list-section {
    margin-top: 0;
  }

  .tutorial-player-meta {
    margin-bottom: 10px;
  }

  .tutorial-player-copy h2 {
    max-width: none;
    font-size: 1.333rem;
    line-height: 1.4;
  }

  .tutorial-player-copy p {
    max-width: none;
    font-size: 0.933rem;
    line-height: 1.7;
  }

  .tutorial-editor-layout {
    gap: 16px;
  }

  .tutorial-live-preview {
    padding: 14px;
  }

  .tutorial-detail-content h3 {
    font-size: 1.2rem;
  }

  .tutorial-detail-stage {
    margin-bottom: 16px;
  }

  .tutorial-detail-danger {
    margin-top: 18px;
  }

  .tutorial-download-heading {
    margin-bottom: 28px;
    padding: 0 16px;
  }

  .tutorial-download-heading h1 {
    font-size: 1.733rem;
  }

  .tutorial-download-list {
    padding: 0 8px;
  }

  .tutorial-download-item {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 10px;
    padding: 16px 14px;
  }

  .tutorial-download-title {
    font-size: 0.933rem;
  }

  .tutorial-download-link {
    grid-column: auto;
    width: 100%;
    min-height: 44px;
  }

  .tutorial-download-empty {
    padding: 56px 14px;
  }

  .compact-overview {
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .directory-tree {
    margin-top: 16px;
    border-radius: var(--radius-lg);
  }

  .directory-tree-header {
    padding: 16px;
  }

  .tree-toolbar {
    position: sticky;
    top: 64px;
    z-index: 2;
    display: flex;
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(8px);
  }

  .tree-search input {
    height: 46px;
  }

  .tree-search kbd {
    display: none;
  }

  .tree-breadcrumb {
    justify-content: flex-start;
    min-height: 28px;
    overflow: hidden;
  }

  .tree-breadcrumb button {
    min-height: 36px;
    padding: 6px 4px;
  }

  .directory-tree-list {
    display: block;
    padding: 8px;
  }

  .directory-tree .tree-root + .tree-root {
    margin-top: 6px;
  }

  .tree-root-trigger,
  .tree-child-trigger {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 12px 10px;
    min-height: 64px;
  }

  .tree-root-meta,
  .child-count {
    grid-column: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .tree-state {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
    min-width: 52px;
    min-height: 44px;
  }

  .tree-root-copy strong,
  .tree-child-copy strong {
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .tree-root-copy small,
  .tree-child-copy small {
    white-space: normal;
    overflow-wrap: anywhere;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
  }

  .tree-root-content {
    margin-left: 12px;
  }

  .tree-content-inner {
    padding: 14px 10px 14px 16px;
  }

  .tree-child-group::before {
    left: -16px;
    width: 15px;
  }

  .tree-links {
    grid-template-columns: 1fr;
  }

  .tree-child-content .tree-links {
    padding-left: 0;
  }

  .tree-links a {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
  }

  .tree-links a strong {
    font-size: 0.933rem;
  }

  .tree-links a small {
    font-size: 0.8rem;
    line-height: 1.55;
  }

  .tree-child-content .resource-empty {
    padding-left: 8px;
  }

  .admin-search {
    align-items: stretch;
    flex-wrap: wrap;
  }

  .admin-search label {
    flex-basis: 100%;
    max-width: none;
  }

  .admin-search .button {
    min-height: 44px;
  }

  .pagination {
    justify-content: space-between;
  }

  .detail-list {
    grid-template-columns: 1fr;
  }

  .detail-list dt {
    border-bottom: 0;
  }

  .rich-toolbar {
    gap: 5px;
  }

  .rich-toolbar button,
  .rich-toolbar select,
  .color-tool {
    min-height: 38px;
  }

  .rich-editor {
    min-height: 180px;
  }

  .preview-directory-card {
    align-items: flex-start;
    gap: 12px;
    flex-direction: column;
  }

  .access-text-settings-panel {
    margin-top: 16px;
  }

  .access-text-editor-layout {
    gap: 16px;
  }

  .access-live-preview {
    padding: 12px;
  }

  .access-live-preview .login-panel {
    padding: 22px;
  }

  .access-text-editor-layout .button {
    min-height: 44px;
  }

  .tutorial-card-settings {
    padding: 16px;
  }

  .tutorial-card-settings-layout {
    gap: 16px;
  }

  .tutorial-card-live-preview {
    padding: 10px;
  }

  .tutorial-card-live-preview .home-tutorial-promo {
    padding: 18px 14px;
  }
}

/* ============================================================
   响应式 - 超小屏 (max-width: 440px)
   ============================================================ */

@media (max-width: 440px) {
  .resource-overview {
    padding: 24px 18px;
  }

  .overview-copy p {
    font-size: 0.867rem;
  }

  .resource-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .resource-stats dt {
    font-size: 0.733rem;
  }

  .resource-stats dd {
    font-size: 1.2rem;
  }

  .resource-count {
    display: none;
  }

  .resource-link {
    grid-template-columns: 38px minmax(0, 1fr) 14px;
    padding: 12px 11px;
  }

  .link-avatar {
    width: 38px;
    height: 38px;
  }

  .form-actions {
    grid-template-columns: 1fr;
  }

  .topbar {
    gap: 10px;
  }

  .account {
    gap: 8px;
  }

  .directory-navigation-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .directory-navigation-action {
    grid-column: 1;
    grid-row: auto;
    justify-self: start;
    min-height: 38px;
  }

  .directory-navigation-meta {
    grid-column: 1;
  }

  .navigation-header,
  .navigation-section > header {
    padding-left: 12px;
    padding-right: 12px;
  }

  .directory-page-heading {
    padding-left: 16px;
    padding-right: 16px;
  }

  .directory-tree-header > span {
    display: none;
  }

  .tree-root-trigger {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    padding-left: 6px;
  }

  .tree-root-content {
    margin-left: 10px;
  }

  .tree-content-inner {
    padding-left: 12px;
  }

  .tree-child-group > header {
    grid-template-columns: 15px minmax(0, 1fr) auto;
  }

  .tree-root-meta span {
    font-size: 0.667rem;
  }

  .tree-state {
    min-width: 48px;
    padding-left: 8px;
    padding-right: 8px;
  }

  .tree-child-group {
    border-radius: var(--radius-sm);
  }

  .public-main {
    padding-left: 10px;
    padding-right: 10px;
  }

  .directory-tree-header,
  .tree-toolbar {
    padding-left: 10px;
    padding-right: 10px;
  }

  .directory-tree-header p {
    max-width: 240px;
  }

  .home-tutorial-promo {
    padding: 22px 16px;
  }

  .home-tutorial-promo h2 {
    font-size: 1.4rem;
  }

  .tutorial-card {
    grid-template-columns: 28px minmax(0, 1fr) 44px;
    gap: 8px;
    padding: 12px 10px;
  }

  .tutorial-card-meta {
    flex-direction: column;
  }

  .tutorial-card-state {
    min-height: 24px;
  }

  .tutorial-download-heading {
    padding-right: 16px;
    padding-left: 16px;
  }

  .tutorial-download-heading h1 {
    font-size: 1.6rem;
  }

  .tutorial-download-list {
    padding: 0 6px;
  }

  .tutorial-download-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 14px 10px;
  }

  .tutorial-download-title {
    font-size: 0.867rem;
  }
}

/* ============================================================
   减少动画偏好
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .tree-breadcrumb {
    scroll-behavior: auto;
  }

  .tutorial-home-button:hover,
  .tutorial-home-button:active,
  .tutorial-query-button:hover,
  .tutorial-query-button:active,
  .tutorial-card:hover,
  .tutorial-card:active,
  .tutorial-download-item:hover,
  .tutorial-download-link:hover,
  .tutorial-download-link:active {
    transform: none;
  }
}

/* ============================================================
   宽屏优化 (min-width: 1180px)
   ============================================================ */

@media (min-width: 1180px) {
  .directory-tree-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 8px;
  }

  .directory-tree .tree-root + .tree-root {
    margin-top: 0;
  }

  .tree-root[data-expanded="true"] {
    grid-column: 1 / -1;
  }

  .tree-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
}

@media (min-width: 701px) and (max-width: 1179px) {
  .directory-tree-list {
    display: block;
  }

  .directory-tree .tree-root + .tree-root {
    margin-top: 8px;
  }

  .tree-root[data-expanded="true"] {
    grid-column: auto;
  }

  .tree-toolbar {
    grid-template-columns: minmax(220px, 360px) minmax(0, 1fr);
  }

  .tree-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ============================================================
   补充样式：密码输入框遮罩、视频详情、响应式细节
   ============================================================ */

.masked-text-input {
  -webkit-text-security: disc;
  font-family: text, var(--font-sans);
}

.tutorial-detail video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #080b0f;
}

@media (max-width: 700px) {
  .tutorial-detail video {
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 800px) {
  .toggle-track {
    flex-basis: 42px;
    width: 42px;
    height: 24px;
    border-radius: 12px;
  }

  .toggle-track::after {
    width: 18px;
    height: 18px;
  }

  .toggle-control input:checked + .toggle-track::after {
    transform: translateX(18px);
  }
}