:root {
  --color-primary: #3498db;
  --color-secondary: #2ecc71;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-border: #e1e4e8;
  
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  --max-width: 1100px;
  --border-radius: 8px;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #e0e0e0;
    --color-text-light: #a0a0a0;
    --color-bg: #1a1a1a;
    --color-bg-secondary: #2d2d2d;
    --color-border: #404040;
  }
}

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

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

.site-header {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-xl);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.site-logo {
  font-size: 2rem;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
}

.logo-letter {
  color: var(--color-primary);
  font-size: 2.5rem;
}

.logo-text {
  color: var(--color-text);
  letter-spacing: 2px;
  margin-left: -2px;
}

.site-nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Header Layout */
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

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

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

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: 4px;
}

.lang-btn {
  background: none;
  border: none;
  padding: 6px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  color: var(--color-text);
  background: var(--color-bg);
}

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

.lang-divider {
  color: var(--color-border);
  font-size: 0.875rem;
}

.main-content {
  min-height: calc(100vh - 200px);
  padding-bottom: var(--spacing-xl);
}

.main-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-xl);
}

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

.content-area {
  padding: var(--spacing-md);
}

.sidebar-profile {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
}

.profile-avatar {
  width: 200px;
  height: 200px;
  margin: 0 auto var(--spacing-md);
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-placeholder {
  font-size: 2.5rem;
  font-weight: 700;
  color: white;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.profile-name {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.profile-bio {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

.sidebar-links {
  margin-bottom: var(--spacing-lg);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  color: var(--color-text);
  text-decoration: none;
  transition: all 0.2s ease;
}

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

.icon {
  width: 20px;
  height: 20px;
}

/* ==================== */
/* 侧边栏样式增强 */
/* ==================== */

.sidebar-articles {
  margin-bottom: var(--spacing-lg);
}

.sidebar-title {
  font-size: 0.875rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.scrollable-list {
  max-height: 300px;
  overflow-y: auto;
  padding-right: 4px;
}

/* 自定义滚动条 */
.scrollable-list::-webkit-scrollbar {
  width: 4px;
}

.scrollable-list::-webkit-scrollbar-track {
  background: transparent;
}

.scrollable-list::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

.scrollable-list::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

.article-item {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease;
}

.article-item:hover {
  background-color: var(--color-bg-secondary);
}

.article-item:last-child {
  border-bottom: none;
}

.article-link {
  display: flex;
  align-items: flex-start;
  padding: var(--spacing-sm);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--border-radius);
}

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

.article-index {
  display: inline-block;
  width: 24px;
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-right: var(--spacing-sm);
  text-align: right;
}

.article-content {
  flex: 1;
}

.article-title {
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.article-date {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

.article-item.first .article-index {
  color: var(--color-primary);
  font-weight: bold;
}

.more-link .article-link {
  color: var(--color-primary);
  font-size: 0.875rem;
  justify-content: center;
}

.more-link i {
  margin-right: var(--spacing-sm);
}

.no-articles {
  color: var(--color-text-light);
  font-style: italic;
  text-align: center;
  padding: var(--spacing-md);
}

.theme-toggle {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: all 0.2s ease;
  margin-top: var(--spacing-md);
}

.theme-toggle i {
  font-size: 0.875rem;
}

.theme-toggle:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* 手动暗色模式覆盖 */
.dark-theme {
  --color-text: #e0e0e0;
  --color-text-light: #a0a0a0;
  --color-bg: #1a1a1a;
  --color-bg-secondary: #2d2d2d;
  --color-border: #404040;
}

.post-content {
  font-size: 1.1rem;
  line-height: 1.8;
}

.post-content h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-content h3 {
  font-size: 1.25rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

.post-content code {
  font-family: var(--font-mono);
  background: var(--color-bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.post-content pre {
  background: var(--color-bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

.post-content pre code {
  background: none;
  padding: 0;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

.post-navigation {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.post-article {
  max-width: 800px;
}

.post-article h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.post-body {
  margin-top: var(--spacing-lg);
}

.post-body h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-body h3 {
  font-size: 1.25rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.post-body p {
  margin-bottom: var(--spacing-md);
}

.post-body ul, .post-body ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.post-body li {
  margin-bottom: var(--spacing-sm);
}

.nav-back {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-back:hover {
  text-decoration: underline;
}

.site-footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-light);
}

.social-links {
  margin-top: var(--spacing-sm);
}

.social-links a {
  color: var(--color-text-light);
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    order: -1;
  }

  .header-container {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .header-left {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .site-header .container {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
}

/* 基础全局样式 */
.hidden { display: none !important; }
.loading {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-light);
}

.article-list {
  list-style: none;
}

.post-list .post-item {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.post-meta {
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.post-link {
  color: var(--color-primary);
  text-decoration: none;
}

.post-link:hover {
  text-decoration: underline;
}

.recent-posts {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
}

.recent-posts h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-heading);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
}

.more-posts-link {
  margin-top: var(--spacing-lg);
  text-align: center;
}

.more-posts-link a {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-speed);
}

.more-posts-link a:hover {
  background-color: var(--color-primary-dark);
}