:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f5;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --border: #e0e0e0;
  --accent: #333333;
  --accent-hover: #000000;
  --shadow: rgba(0, 0, 0, 0.1);
  --header-bg: #ffffff;
}

html.dark {
  --bg: #121212;
  --bg-secondary: #1e1e1e;
  --text: #e0e0e0;
  --text-secondary: #a0a0a0;
  --border: #333333;
  --accent: #ffffff;
  --accent-hover: #ffffff;
  --shadow: rgba(0, 0, 0, 0.3);
  --header-bg: #1a1a1a;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s, border-color 0.3s;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  flex-shrink: 0;
}

.search-box {
  position: relative;
  margin-right: 20px;
}

.search-input {
  padding: 8px 12px 8px 36px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background-color: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  width: 180px;
  transition: border-color 0.3s, width 0.3s;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  width: 220px;
}

.search-btn {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
}

.search-btn:hover {
  color: var(--text);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-nav {
  display: flex;
  gap: 20px;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.social-icon {
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.social-icon:hover {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  color: var(--text);
}

.theme-toggle svg {
  display: none;
}

html.dark .theme-toggle .sun-icon {
  display: block;
}

html:not(.dark) .theme-toggle .moon-icon {
  display: block;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  cursor: pointer;
  color: var(--text);
}

.site-main {
  padding: 40px 0;
  min-height: calc(100vh - 200px);
}

.main-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  clear: both;
}

.content-area {
  flex: 1;
  width: 100%;
  min-width: 0;
  overflow: visible;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
}

.content-area {
  min-width: 0;
  overflow: visible;
}

.page-title {
  font-size: 2rem;
  margin-bottom: 30px;
  color: var(--text);
  clear: both;
}

.post-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  clear: both;
}

.post-card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.3s;
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 20px var(--shadow);
}

.post-image-link {
  display: block;
  overflow: hidden;
}

.post-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s;
}

.post-card:hover .post-image {
  transform: scale(1.05);
}

.post-content {
  padding: 20px;
}

.post-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

.post-category {
  color: var(--accent);
  font-weight: 500;
}

.post-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
  line-height: 1.4;
}

.post-summary {
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 15px;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.75rem;
  padding: 3px 8px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-secondary);
}

.pagination {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.pagination a, .pagination .current {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
}

.pagination a:hover {
  background-color: var(--bg-secondary);
}

.pagination .current {
  background-color: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.sidebar-widget {
  background-color: var(--bg-secondary);
  padding: 20px;
  border-radius: 8px;
}

.widget-title {
  font-size: 1rem;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.widget-toggle {
  transition: transform 0.3s;
}

.sidebar-widget.collapsed .widget-toggle {
  transform: rotate(-180deg);
}

.sidebar-widget.collapsed .category-list,
.sidebar-widget.collapsed .tag-cloud {
  display: none;
}

@media (min-width: 601px) {
  .widget-toggle {
    display: none !important;
  }

  .sidebar-widget {
    cursor: default;
  }

  .sidebar-widget .category-list,
  .sidebar-widget .tag-cloud {
    display: block !important;
  }
}

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

.category-list li {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

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

.category-list .count {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud .tag {
  font-size: 0.8rem;
}

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

.single-image {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 30px;
}

.single-header {
  margin-bottom: 30px;
}

.single-header h1 {
  font-size: 2.2rem;
  margin-bottom: 15px;
  line-height: 1.3;
}

.single-meta {
  display: flex;
  gap: 15px;
  color: var(--text-secondary);
}

.single-meta .category {
  color: var(--accent);
  font-weight: 500;
}

.single-content {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 30px;
}

.single-content a {
  color: #3b82f6;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.single-content a:hover {
  color: #2563eb;
}

.single-content p {
  margin-bottom: 20px;
}

.single-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.single-content h2 {
  font-size: 1.5rem;
  margin: 30px 0 15px;
}

.single-content h3 {
  font-size: 1.25rem;
  margin: 25px 0 10px;
}

.single-content ul, .single-content ol {
  margin: 15px 0;
  padding-left: 25px;
}

.single-content li {
  margin-bottom: 8px;
}

.single-content code {
  background-color: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9rem;
}

.single-content pre {
  background-color: var(--bg-secondary);
  padding: 15px;
  border-radius: 4px;
  overflow-x: auto;
  margin: 20px 0;
}

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

.single-content .table-wrapper {
  overflow-x: auto;
  max-width: 100%;
  margin: 20px 0;
}

.single-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.single-content th,
.single-content td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.single-content th {
  background-color: var(--bg-secondary);
  font-weight: 600;
}

.single-content tr:nth-child(even) td {
  background-color: var(--bg-secondary);
}

.single-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.tags-label {
  font-weight: 500;
  color: var(--text-secondary);
}

.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 30px 0;
  margin-top: 40px;
  transition: background-color 0.3s, border-color 0.3s;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
}

.search-page {
  max-width: 600px;
}

.search-page h1 {
  margin-bottom: 20px;
}

.search-form {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
}

.search-full {
  flex: 1;
  padding: 12px 15px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background-color: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.search-full:focus {
  outline: none;
  border-color: var(--accent);
}

.search-form button {
  padding: 12px 25px;
  background-color: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  transition: opacity 0.2s;
}

.search-form button:hover {
  opacity: 0.9;
}

.search-result {
  padding-bottom: 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.search-result:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.about-page, .contact-page {
  max-width: 700px;
}

.about-page h1, .contact-page h1 {
  margin-bottom: 20px;
}

.about-page p {
  margin-bottom: 15px;
  color: var(--text-secondary);
}

.contact-page p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.contact-info {
  margin-top: 20px;
}

.contact-info p {
  margin-bottom: 10px;
}

.contact-info a {
  color: var(--accent);
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
  }

  .search-box {
    order: 3;
    flex: 1 1 100%;
    max-width: none;
    margin: 10px 0 0;
  }

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

  .sidebar {
    order: -1;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar-widget {
    flex: 1;
    min-width: 200px;
  }

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

@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }

  .site-header {
    padding: 12px 0;
  }

  .site-logo {
    font-size: 1.2rem;
  }

  .header-right {
    gap: 8px;
  }

  .social-links {
    display: none;
  }

  .search-box {
    display: none;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    flex-direction: column;
    padding: 16px;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    z-index: 99;
  }

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

  .menu-toggle {
    display: flex;
  }

  .site-main {
    padding: 24px 0;
  }

  .page-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
  }

  .post-list {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .single-header h1 {
    font-size: 1.5rem;
  }

  .single-content {
    font-size: 1rem;
  }

  .single-content pre {
    font-size: 0.85rem;
  }

  .sidebar {
    flex-direction: column;
  }

  .sidebar-widget {
    min-width: auto;
  }

  .widget-title {
    cursor: pointer;
  }

  .widget-toggle {
    display: inline-block;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .main-layout {
    flex-direction: column;
    gap: 24px;
  }

  .sidebar {
    order: 0;
    width: 100%;
    flex-direction: column;
  }
}

/* 404 Page */
.not-found {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: 40px 20px;
}

.not-found-content {
  max-width: 500px;
}

.not-found-title {
  font-size: 8rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 20px;
  color: var(--text);
  opacity: 0.15;
}

.not-found-message {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text);
}

.not-found-description {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.not-found-button {
  display: inline-block;
  padding: 12px 30px;
  background-color: var(--text);
  color: var(--bg);
  border-radius: 4px;
  font-weight: 500;
  transition: opacity 0.2s;
}

.not-found-button:hover {
  opacity: 0.9;
  color: var(--bg);
}