.site-header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.site-header .container {
  max-width: 100%;
  padding: 0 40px;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  width: 100%;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-main {
  height: 60px;
  width: auto;
  color: var(--text-color);
}

.main-navigation {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--text-color);
  font-weight: 500;
  transition: color var(--transition-speed);
}

.nav-menu a:hover {
  color: var(--accent-color);
}

.social-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.social-links a,
.theme-toggle,
.lang-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-color);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 50%;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

.lang-toggle {
  width: 40px;
  font-weight: 600;
  font-size: 14px;
}

.social-links a:hover,
.theme-toggle:hover,
.lang-toggle:hover {
  background-color: var(--gray-200);
}

[data-theme="dark"] .social-links a:hover,
[data-theme="dark"] .theme-toggle:hover,
[data-theme="dark"] .lang-toggle:hover {
  background-color: var(--gray-700);
}

.theme-toggle .sun-icon {
  display: none;
}

.theme-toggle .moon-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-color);
  transition: all var(--transition-speed);
}

.hero-section {
  padding: 4rem 0;
  text-align: center;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  color: var(--accent-color);
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.8;
  max-width: 800px;
  margin: 0 auto;
  color: var(--text-color);
}

.content-section {
  padding: 3rem 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.announcements-column h2,
.blog-column h2 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  color: var(--text-color);
}

body[lang="en"] .nav-menu a::before,
body[lang="en"] h2[data-en]::before {
  content: attr(data-en);
}

body:not([lang="en"]) .nav-menu a::before,
body:not([lang="en"]) h2[data-cn]::before {
  content: attr(data-cn);
}

.nav-menu a {
  font-size: 0;
}

.nav-menu a::before {
  font-size: 1rem;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.post-item {
  padding: 1.25rem;
  background-color: var(--header-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.post-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.post-item h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.post-item h3 a {
  color: var(--text-color);
}

.post-item time {
  font-size: 0.875rem;
  color: var(--gray-500);
}

.site-main {
  background-color: var(--bg-color);
  flex: 1;
  min-height: calc(100vh - 100px);
  padding-top: 70px;
}

.site-footer {
  background-color: var(--footer-bg);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-color);
  font-size: 0.9rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--gray-500);
}

@media (max-width: 1024px) {
  .nav-menu {
    gap: 1.5rem;
  }

  .content-grid {
    gap: 2rem;
  }

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .site-header .container {
    padding: 0 20px;
  }

  .main-navigation {
    position: relative;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--header-bg);
    flex-direction: column;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: none;
    min-width: 200px;
  }

  .nav-menu.active {
    display: flex;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .logo-main {
    height: 50px;
  }

  .hero-content h1 {
    font-size: 1.5rem;
  }

  .social-links a,
  .theme-toggle {
    width: 32px;
    height: 32px;
  }
}

.single-post,
.page-content {
  padding: 3rem 0;
}

.entry-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.entry-title {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.entry-meta {
  font-size: 0.9rem;
  color: var(--gray-500);
}

.entry-meta .separator {
  margin: 0 0.5rem;
}

.entry-thumbnail {
  margin-bottom: 2rem;
}

.entry-thumbnail img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.entry-content {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-color);
}

.entry-content h2,
.entry-content h3,
.entry-content h4 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.entry-content p {
  margin-bottom: 1.5rem;
}

.entry-content a {
  color: var(--accent-color);
  text-decoration: underline;
}

.entry-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5rem 0;
}

.entry-content ul,
.entry-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.entry-content li {
  margin-bottom: 0.5rem;
}

.entry-content code {
  background-color: var(--gray-200);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Consolas', 'Monaco', monospace;
}

[data-theme="dark"] .entry-content code {
  background-color: var(--gray-700);
}

.entry-content pre {
  background-color: var(--gray-200);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

[data-theme="dark"] .entry-content pre {
  background-color: var(--gray-800);
}

.entry-content pre code {
  background-color: transparent;
  padding: 0;
}

.entry-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.entry-categories,
.entry-tags {
  margin-bottom: 1rem;
}

.entry-categories a,
.entry-tags a {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  margin-right: 0.5rem;
  background-color: var(--gray-200);
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--text-color);
}

[data-theme="dark"] .entry-categories a,
[data-theme="dark"] .entry-tags a {
  background-color: var(--gray-700);
}

.archive-header {
  margin-bottom: 3rem;
  text-align: center;
}

.archive-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.archive-description {
  font-size: 1.125rem;
  color: var(--gray-500);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.archive-item {
  background-color: var(--header-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.archive-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.archive-thumbnail img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.archive-content {
  padding: 1.5rem;
}

.archive-item-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.archive-item-title a {
  color: var(--text-color);
}

.archive-meta {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 1rem;
}

.archive-meta .separator {
  margin: 0 0.5rem;
}

.archive-excerpt {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-color);
  margin-bottom: 1rem;
}

.read-more {
  color: var(--accent-color);
  font-weight: 500;
  font-size: 0.9rem;
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
}

.pagination .nav-links {
  display: flex;
  gap: 0.5rem;
}

.pagination a,
.pagination span {
  padding: 0.5rem 1rem;
  background-color: var(--header-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-color);
  transition: background-color var(--transition-speed);
}

.pagination a:hover {
  background-color: var(--accent-color);
  color: var(--white);
}

.pagination .current {
  background-color: var(--accent-color);
  color: var(--white);
}

.error-404 {
  padding: 6rem 0;
}

.error-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.error-title {
  font-size: 8rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.error-content h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.error-content p {
  font-size: 1.125rem;
  color: var(--gray-500);
  margin-bottom: 2rem;
}

.btn-home {
  display: inline-block;
  padding: 0.75rem 2rem;
  background-color: var(--accent-color);
  color: var(--white);
  border-radius: 8px;
  font-weight: 500;
  transition: opacity var(--transition-speed);
}

.btn-home:hover {
  opacity: 0.9;
}

@media (max-width: 768px) {
  .entry-title {
    font-size: 2rem;
  }

  .archive-title {
    font-size: 2rem;
  }

  .posts-grid {
    grid-template-columns: 1fr;
  }

  .error-title {
    font-size: 5rem;
  }
}