:root {
  --primary-color: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --bg-color: #ffffff;
  --bg-secondary: #f9fafb;
  --border-color: #e5e7eb;
  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --quote-bg: #f0f9ff;
  --quote-border: #3b82f6;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.8;
  color: var(--text-color);
  background-color: var(--bg-color);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 3rem 0;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: 2rem;
  font-weight: 800;
  margin: 0;
  letter-spacing: -0.5px;
}

.site-title a {
  color: white;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.site-title a:hover {
  opacity: 0.9;
}

.site-nav nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
}

.site-nav nav li {
  margin: 0;
}

.site-nav nav a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  display: block;
}

.site-nav nav a:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: white;
}

.post {
  margin-bottom: 4rem;
}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--border-color);
}

.post-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 1.5rem 0;
  color: var(--text-color);
  letter-spacing: -1px;
}

.post-categories {
  margin-bottom: 1rem;
}

.category {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
  color: white;
  padding: 0.35rem 1rem;
  border-radius: 2rem;
  font-size: 0.85rem;
  font-weight: 600;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.post-meta {
  color: var(--text-light);
  font-size: 0.95rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.post-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lastmod {
  color: #9ca3af;
  font-size: 0.9rem;
}

.post-content {
  font-size: 1.15rem;
  line-height: 1.8;
  color: #374151;
}

.post-content h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-top: 3.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-color);
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--primary-color);
  letter-spacing: -0.5px;
}

.post-content h3 {
  font-size: 1.7rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-color);
}

.post-content h4 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #4b5563;
}

.post-content p {
  margin-bottom: 1.75rem;
  text-align: justify;
}

.post-content a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}

.post-content a:hover {
  color: var(--primary-dark);
  border-bottom-color: var(--primary-dark);
}

.post-content blockquote {
  border-left: 4px solid var(--quote-border);
  background: linear-gradient(135deg, var(--quote-bg) 0%, #e0f2fe 100%);
  padding: 1.5rem 2rem;
  margin: 2.5rem 0;
  font-style: italic;
  border-radius: 0 0.75rem 0.75rem 0;
  box-shadow: var(--shadow-sm);
  color: #1e40af;
}

.post-content code {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 0.25rem 0.6rem;
  border-radius: 0.375rem;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
}

.post-content pre {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 1.75rem;
  border-radius: 0.75rem;
  overflow-x: auto;
  margin: 2.5rem 0;
  box-shadow: var(--shadow-md);
}

.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  box-shadow: none;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.75rem;
  padding-left: 2rem;
}

.post-content li {
  margin-bottom: 0.75rem;
  line-height: 1.7;
}

.post-content ul li::marker {
  color: var(--primary-color);
}

.post-content ol li::marker {
  color: var(--primary-color);
  font-weight: 600;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.5rem 0;
  box-shadow: var(--shadow-sm);
  border-radius: 0.75rem;
  overflow: hidden;
}

.post-content th,
.post-content td {
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  text-align: left;
}

.post-content th {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}

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

.post-content tr:hover {
  background-color: #f0f9ff;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 0.75rem;
  box-shadow: var(--shadow-md);
  margin: 2rem 0;
}

.post-footer {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 2px solid var(--border-color);
}

.post-tags {
  margin-bottom: 2rem;
}

.post-tags h4 {
  margin: 0 0 0.75rem 0;
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.post-tags a {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
  color: white;
  padding: 0.4rem 1rem;
  border-radius: 2rem;
  text-decoration: none;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.post-tags a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 3rem;
  padding: 2rem 0;
  border-top: 2px solid var(--border-color);
}

.post-nav a {
  flex: 1;
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-color);
  padding: 1.5rem;
  border-radius: 0.75rem;
  transition: all 0.2s ease;
  background-color: var(--bg-secondary);
  border: 2px solid transparent;
}

.post-nav a:hover {
  background-color: var(--quote-bg);
  border-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.post-nav .prev {
  text-align: left;
}

.post-nav .next {
  text-align: right;
  flex-direction: row-reverse;
}

.nav-arrow {
  font-size: 2rem;
  color: var(--primary-color);
  margin: 0 0.75rem;
}

.nav-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.nav-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-color);
}

footer {
  border-top: 2px solid var(--border-color);
  padding: 3rem 0;
  margin-top: 5rem;
  color: var(--text-light);
  text-align: center;
  background-color: var(--bg-secondary);
}

footer p {
  margin: 0.5rem 0;
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-title {
    font-size: 1.75rem;
  }

  .site-nav nav ul {
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .site-nav nav a {
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
  }

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

  .post-content {
    font-size: 1.05rem;
  }

  .post-content h2 {
    font-size: 1.75rem;
  }

  .post-content h3 {
    font-size: 1.4rem;
  }

  .post-nav {
    flex-direction: column;
  }

  .nav-arrow {
    font-size: 1.5rem;
    margin: 0.25rem;
  }

  header {
    padding: 2rem 0;
  }
}

@media (max-width: 480px) {
  .post-title {
    font-size: 1.75rem;
  }

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

  .post-content h2 {
    font-size: 1.5rem;
  }

  .post-content h3 {
    font-size: 1.25rem;
  }
}