/**
 * 全新前台样式系统 - 现代简约风格
 * 版本: 2.0
 * 设计理念: 简洁、现代、高效
 */

/* ========================================
   01. CSS变量系统
   ======================================== */

:root {
  /* 主色调 */
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-active: #1d4ed8;
  --primary-light: #dbeafe;
  
  /* 辅助色 */
  --secondary: #6b7280;
  --secondary-hover: #4b5563;
  
  /* 背景色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  
  /* 文字色 */
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  
  /* 边框色 */
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  
  /* 功能色 */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  /* 字体 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 14px;
  --font-size-sm: 12px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --line-height: 1.6;
  
  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* 布局 */
  --header-height: 64px;
  --sidebar-width: 320px;
  --content-max-width: 680px;
}

/* ========================================
   02. 基础样式
   ======================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  padding-top: var(--header-height);
  min-height: 100vh;
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========================================
   03. 布局系统
   ======================================== */

.main-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-fluid {
  padding: 0 var(--spacing-md);
}

/* 顶部导航 */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.main-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.logo img {
  height: 32px;
  width: auto;
}

/* 搜索框 */
.header-search {
  flex: 1;
  max-width: 400px;
  margin: 0 var(--spacing-lg);
}

.header-search .form-control {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.header-search .form-control:focus {
  background: var(--bg-primary);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* 导航菜单 */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header-nav-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

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

.header-nav-item.active {
  color: var(--primary);
  background: var(--primary-light);
}

.header-nav-item .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--danger);
  color: white;
  border-radius: var(--radius-xl);
  font-size: 10px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 用户菜单 */
.header-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

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

.header-user img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

.header-user-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
}

/* ========================================
   04. 侧边栏
   ======================================== */

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-md));
  height: fit-content;
}

.sidebar-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.sidebar-card-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-md);
}

.sidebar-menu {
  list-style: none;
}

.sidebar-menu-item {
  margin-bottom: var(--spacing-xs);
}

.sidebar-menu-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.sidebar-menu-link:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
}

.sidebar-menu-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.sidebar-menu-link i {
  width: 20px;
  text-align: center;
  font-size: var(--font-size-lg);
}

/* ========================================
   05. 主内容区
   ======================================== */

.main-content {
  flex: 1;
  padding: var(--spacing-md) 0;
}

.content-wrapper {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* ========================================
   06. 卡片组件
   ======================================== */

.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base);
}

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

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

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

.card-body {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* ========================================
   07. 按钮组件
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn:active {
  transform: translateY(0);
}

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

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

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

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

.btn-success {
  background: var(--success);
  color: white;
}

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

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  width: 100%;
  display: flex;
}

/* ========================================
   08. 表单组件
   ======================================== */

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

/* ========================================
   09. 发布器
   ======================================== */

.publisher {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.publisher-header {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.publisher-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.publisher-input {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.publisher-input:hover {
  background: var(--border-light);
}

.publisher-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.publisher-tools {
  display: flex;
  gap: var(--spacing-sm);
}

.publisher-tool {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.publisher-tool:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
}

/* ========================================
   10. 动态卡片
   ======================================== */

.post {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base);
}

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

.post-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.post-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  cursor: pointer;
}

.post-author {
  flex: 1;
}

.post-author-name {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.post-author-name:hover {
  color: var(--primary);
}

.post-time {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.post-content {
  color: var(--text-primary);
  line-height: var(--line-height);
  margin-bottom: var(--spacing-md);
}

.post-content p {
  margin-bottom: var(--spacing-sm);
}

.post-content p:last-child {
  margin-bottom: 0;
}

.post-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.post-media img,
.post-media video {
  width: 100%;
  display: block;
}

.post-footer {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.post-action {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  border: none;
}

.post-action:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
}

.post-action.active {
  color: var(--primary);
}

.post-action i {
  font-size: var(--font-size-lg);
}

/* ========================================
   11. 响应式设计
   ======================================== */

@media (max-width: 991px) {
  :root {
    --sidebar-width: 100%;
  }
  
  .sidebar {
    display: none;
  }
  
  .content-wrapper {
    max-width: 100%;
  }
}

@media (max-width: 767px) {
  :root {
    --header-height: 56px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
  }
  
  .header-search {
    display: none;
  }
  
  .header-user-name {
    display: none;
  }
  
  .card {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
  }
  
  .post {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
  }
}

/* ========================================
   12. 动画效果
   ======================================== */

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-fade-in {
  animation: fadeIn 0.3s ease;
}

.animate-slide-in {
  animation: slideIn 0.3s ease;
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ========================================
   13. 加载动画
   ======================================== */

.loader {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.loader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========================================
   14. 工具类
   ======================================== */

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-left {
  text-align: left;
}

.d-none {
  display: none;
}

.d-block {
  display: block;
}

.d-flex {
  display: flex;
}

.align-items-center {
  align-items: center;
}

.justify-content-center {
  justify-content: center;
}

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

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

/* ========================================
   15. 滚动条美化
   ======================================== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
  background: var(--text-tertiary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ========================================
   16. 选择文本样式
   ======================================== */

::selection {
  background: var(--primary-light);
  color: var(--primary);
}

::-moz-selection {
  background: var(--primary-light);
  color: var(--primary);
}

/* ========================================
   17. 现代化布局系统
   ======================================== */

.modern-layout {
  display: grid;
  grid-template-columns: 320px 1fr 320px;
  gap: var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg) 0;
}

.layout-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-lg));
  height: fit-content;
}

.layout-main {
  min-width: 0;
}

.layout-rightbar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-lg));
  height: fit-content;
}

.main-content-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* 移动端布局 */
@media (max-width: 1200px) {
  .modern-layout {
    grid-template-columns: 280px 1fr 280px;
  }
}

@media (max-width: 991px) {
  .modern-layout {
    grid-template-columns: 1fr;
  }
  
  .layout-sidebar,
  .layout-rightbar {
    display: none;
  }
}

/* ========================================
   18. 现代化组件
   ======================================== */

/* 现代化卡片 */
.modern-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
  transition: box-shadow var(--transition-base);
}

.modern-card:hover {
  box-shadow: var(--shadow-md);
}

.modern-card .card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.modern-card .card-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.modern-card .card-body {
  padding: var(--spacing-lg);
}

.modern-card .card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: var(--spacing-xs) 0 0;
}

/* Pro卡片 */
.modern-card.pro-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  color: white;
}

.modern-card.pro-card .card-title {
  color: white;
}

.modern-card.pro-card .btn-light {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
}

.modern-card.pro-card .btn-light:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* 升级卡片 */
.modern-card.upgrade-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.upgrade-icon {
  margin-bottom: var(--spacing-md);
}

.upgrade-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.upgrade-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* 现代化导航 */
.modern-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.modern-header .container {
  height: 100%;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--spacing-lg);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--bg-tertiary);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.logo img {
  height: 32px;
  width: auto;
}

.logo-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-center {
  flex: 1;
  max-width: 400px;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-box .form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-left: 40px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.search-box .form-control:focus {
  background: var(--bg-primary);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
  outline: none;
}

.search-box .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.header-right {
  display: flex;
  align-items: center;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-text {
  display: none;
}

@media (min-width: 992px) {
  .nav-text {
    display: inline;
  }
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

.user-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
}

/* 现代化下拉菜单 */
.modern-dropdown {
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  min-width: 200px;
  margin-top: var(--spacing-sm);
}

.modern-dropdown .dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

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

/* 现代化提示条 */
.modern-alert {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid;
}

.modern-alert .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.modern-alert i {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.modern-alert .alert-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
}

.modern-alert .alert-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.modern-alert-info {
  background: var(--info);
  color: white;
  border-color: var(--info);
}

.modern-alert-warning {
  background: var(--warning);
  color: white;
  border-color: var(--warning);
}

.modern-alert-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.modern-alert-success {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

/* ========================================
   19. 侧边栏样式
   ======================================== */

.modern-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-lg));
  height: fit-content;
}

.sidebar-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.sidebar-nav {
  padding: var(--spacing-sm);
}

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

.nav-item {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
}

.nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-text {
  flex: 1;
}

.nav-section {
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
}

.nav-section-title {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sub-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sub-nav .nav-link {
  padding-left: calc(var(--spacing-md) + 20px + var(--spacing-sm));
}

/* ========================================
   20. 响应式优化
   ======================================== */

@media (max-width: 991px) {
  .modern-layout {
    grid-template-columns: 1fr;
  }
  
  .layout-sidebar,
  .layout-rightbar {
    display: none;
  }
  
  .header-center {
    display: none;
  }
  
  .nav-text {
    display: none;
  }
}

@media (max-width: 767px) {
  :root {
    --header-height: 56px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
  }
  
  .modern-layout {
    padding: var(--spacing-md) 0;
  }
  
  .modern-card {
    border-radius: var(--radius-md);
  }
  
  .modern-card .card-header {
    padding: var(--spacing-md);
  }
  
  .modern-card .card-body {
    padding: var(--spacing-md);
  }
}

/* ========================================
   21. 动画优化
   ======================================== */

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modern-card {
  animation: slideInUp 0.3s ease;
}

/* 滚动动画 */
.modern-card {
  opacity: 0;
  animation: slideInUp 0.3s ease forwards;
}

.modern-card:nth-child(1) { animation-delay: 0.05s; }
.modern-card:nth-child(2) { animation-delay: 0.1s; }
.modern-card:nth-child(3) { animation-delay: 0.15s; }
.modern-card:nth-child(4) { animation-delay: 0.2s; }
.modern-card:nth-child(5) { animation-delay: 0.25s; }
.modern-card:nth-child(6) { animation-delay: 0.3s; }
.modern-card:nth-child(7) { animation-delay: 0.35s; }
.modern-card:nth-child(8) { animation-delay: 0.4s; }

/* ========================================
   22. 特殊组件样式
   ======================================== */

/* 故事滚动 */
.stories-scroll {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.stories-scroll::-webkit-scrollbar {
  display: none;
}

.story-add {
  position: relative;
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.story-add:hover {
  transform: scale(1.05);
}

.story-add-icon {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 24px;
  height: 24px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bg-primary);
}

/* Pro用户滚动 */
.pro-users-scroll,
.pro-pages-scroll {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
  scrollbar-width: none;
  -ms-overload-style: none;
}

.pro-users-scroll::-webkit-scrollbar,
.pro-pages-scroll::-webkit-scrollbar {
  display: none;
}

.pro-user-item,
.pro-page-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.pro-user-item:hover,
.pro-page-item:hover {
  transform: translateY(-2px);
}

.pro-user-avatar,
.pro-page-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.pro-page-avatar {
  border-radius: var(--radius-md);
}

.pro-user-name,
.pro-page-name {
  font-size: var(--font-size-sm);
  color: white;
  text-align: center;
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 推荐列表 */
.suggested-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.suggested-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-light);
}

.suggested-list li:last-child {
  border-bottom: none;
}

/* 加载更多 */
.load-more {
  text-align: center;
  padding: var(--spacing-lg);
}

/* 邀请卡片 */
.invite-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  color: white;
}

.invite-card .card-body {
  color: white;
}

.invite-icon {
  margin-bottom: var(--spacing-md);
}

.invite-card .btn-primary {
  background: white;
  color: var(--primary);
  border: none;
}

.invite-card .btn-primary:hover {
  background: var(--bg-tertiary);
}

/* 荣誉卡片 */
.merits-card {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  border: none;
  color: white;
}

.merits-card .card-title {
  color: white;
}

.merits-balance {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.merits-balance .badge {
  font-size: var(--font-size-lg);
  padding: var(--spacing-sm) var(--spacing-md);
}

/* 回忆卡片 */
.memories-card {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  border: none;
  color: white;
  text-align: center;
  padding: var(--spacing-xl);
}

.memories-card h2 {
  color: white;
  margin-bottom: var(--spacing-sm);
}

.memories-card .card-subtitle {
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}