/* 全局 CSS 变量 */
:root {
  /* 主色调 - 蓝色系 */
  --primary-color: #3B82F6;
  --primary-hover: #2563EB;
  --secondary-color: #60A5FA;
  --accent-color: #93C5FD;
  
  /* 中性色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-tertiary: #F3F4F6;
  --text-primary: #1F2937;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --border-color: #E5E7EB;
  
  /* 辅助色 */
  --success-color: #10B981;
  --warning-color: #F59E0B;
  --error-color: #EF4444;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 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);
  
  /* 过渡效果 */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --text-primary: #F9FAFB;
    --text-secondary: #E5E7EB;
    --text-muted: #9CA3AF;
    --border-color: #4B5563;
  }
}

/* 基础样式重置 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--accent-color);
  border-radius: 4px;
}

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

/* 平滑滚动 */
.smooth-scroll {
  scroll-behavior: smooth;
}

/* 导航样式 */
nav ul li {
  position: relative;
}

/* 下拉菜单样式 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  min-width: 160px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
}

nav ul li:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 移动端汉堡菜单 */
.mobile-menu {
  transition: all var(--transition-normal);
  transform: translateX(-100%);
}

.mobile-menu.active {
  transform: translateX(0);
}

/* 按钮样式 */
.btn {
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: all var(--transition-normal);
}

.btn:hover::before {
  left: 100%;
}

/* 卡片悬停效果 */
.card-hover {
  transition: all var(--transition-normal);
}

.card-hover:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

/* 导航链接悬停效果 */
.nav-link {
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
}

.nav-link:hover::after {
  width: 100%;
}

/* 动画类 */
.fade-in {
  animation: fadeIn var(--transition-slow) ease-in;
}

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

.slide-in-left {
  animation: slideInLeft var(--transition-normal) ease-in;
}

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

.slide-in-right {
  animation: slideInRight var(--transition-normal) ease-in;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 标签云动画 */
.tag-cloud a {
  transition: all var(--transition-fast);
  display: inline-block;
}

.tag-cloud a:hover {
  transform: scale(1.1);
  color: var(--primary-color);
}

/* 阅读进度条 */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background-color: var(--primary-color);
  z-index: 9999;
  width: 0;
  transition: width var(--transition-fast);
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--primary-color);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* 响应式调整 */
@media (max-width: 1023px) {
  /* 平板设备样式 */
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
}

@media (max-width: 767px) {
  /* 移动设备样式 */
  .top-nav {
    display: none;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* 表单样式 */
form input,
form textarea,
form select {
  transition: all var(--transition-fast);
  background-color: var(--bg-primary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

form input:focus,
form textarea:focus,
form select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* 代码块样式 */
pre {
  background-color: var(--bg-tertiary);
  border-radius: 0.375rem;
  padding: 1rem;
  overflow-x: auto;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.5;
}

code {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  background-color: var(--bg-tertiary);
  padding: 0.2em 0.4em;
  border-radius: 0.25rem;
  font-size: 0.875rem;
}

/* 文章卡片样式 */
.article-card {
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-color);
}

/* 分类标签样式 */
.category-tag {
  transition: all var(--transition-fast);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.category-tag:hover {
  background-color: var(--accent-color);
  color: var(--text-primary);
}

/* 社交链接样式 */
.social-link {
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.social-link:hover {
  color: var(--primary-color);
  transform: translateY(-2px);
}

/* 页脚样式 */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

/* 加载动画 */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--bg-tertiary);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 搜索框样式 */
.search-input {
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* 图片懒加载 */
.lazyload {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.lazyload.loaded {
  opacity: 1;
}

/* 标签页样式 */
.tab-button {
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
}

.tab-button.active {
  border-bottom-color: var(--primary-color);
  color: var(--primary-color);
}

/* 分页样式 */
.pagination a {
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

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

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

/* 计数器动画 */
.counter {
  animation: countUp 2s ease-out forwards;
}

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

/* 模态框样式 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 10000;
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--bg-primary);
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1);
}

/* 通知样式 */
.notification {
  position: fixed;
  top: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 10000;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.notification.show {
  transform: translateX(0);
}

.notification.success {
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success-color);
  color: var(--success-color);
}

.notification.error {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error-color);
  color: var(--error-color);
}

.notification.warning {
  background-color: rgba(245, 158, 11, 0.1);
  border: 1px solid var(--warning-color);
  color: var(--warning-color);
}