:root {
  --color-primary: #1a1a1a;
  --color-bg: #ffffff;
  --color-bg-secondary: #fafafa;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-border: #e5e5e5;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --spacing-unit: 8px;
  --max-width: 800px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--color-text);
  text-decoration: none;
  transition: opacity 0.3s ease;
}

a:hover {
  opacity: 0.6;
}

header {
  border-bottom: 1px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 3) 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 100;
}

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 1);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
}

.logo svg {
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.logo:hover svg {
  transform: rotate(360deg);
}

.nav-links {
  display: flex;
  gap: calc(var(--spacing-unit) * 5);
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--color-primary);
}

main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 20) calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 8);
}

#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero {
  text-align: center;
  padding: calc(var(--spacing-unit) * 10) 0 calc(var(--spacing-unit) * 6);
  position: relative;
  z-index: 1;
}

.hero-content {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: calc(var(--spacing-unit) * 2);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto calc(var(--spacing-unit) * 3);
}

.hero .subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: calc(var(--spacing-unit) * 2);
  opacity: 0;
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: calc(var(--spacing-unit) * 5);
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--color-primary);
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit) * 3);
  position: relative;
  z-index: 1;
}

.post-card {
  padding: calc(var(--spacing-unit) * 5);
  border: 1px solid var(--color-border);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0;
  transform: translateY(20px);
}

.post-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.post-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
}

.post-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: calc(var(--spacing-unit) * 2);
  transition: color 0.3s ease;
}

.post-card:hover h3 {
  color: var(--color-primary);
}

.post-card .meta {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 2);
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2);
}

.post-card .excerpt {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.post-card .tags {
  display: flex;
  gap: calc(var(--spacing-unit) * 1);
  margin-top: calc(var(--spacing-unit) * 3);
}

.tag {
  font-size: 0.75rem;
  padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit) * 1.5);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  transition: all 0.3s ease;
}

.post-card:hover .tag {
  background: var(--color-primary);
  color: var(--color-bg);
}

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

.about-section .avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  margin: 0 auto calc(var(--spacing-unit) * 5);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about-section .avatar::before {
  content: '';
  position: absolute;
  inset: -2px;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.8);
  transition: all 0.4s ease;
}

.about-section .avatar:hover::before {
  opacity: 1;
  transform: scale(1);
}

.about-section .avatar svg {
  width: 80px;
  height: 80px;
}

.about-section h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.about-section .bio {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: calc(var(--spacing-unit) * 7);
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--spacing-unit) * 1.5);
  justify-content: center;
  margin-bottom: calc(var(--spacing-unit) * 7);
}

.tech-item {
  font-size: 0.875rem;
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all 0.3s ease;
}

.tech-item:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.social-links {
  display: flex;
  gap: calc(var(--spacing-unit) * 4);
  justify-content: center;
}

.social-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  position: relative;
}

.social-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.social-links a:hover::after {
  width: 100%;
}

.post-detail {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.post-detail header {
  border-bottom: none;
  padding: 0;
  margin-bottom: calc(var(--spacing-unit) * 6);
}

.post-detail h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: calc(var(--spacing-unit) * 2);
  letter-spacing: -0.01em;
}

.post-detail .meta {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 3);
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2);
}

.post-detail .content {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-text);
}

.post-detail .content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: calc(var(--spacing-unit) * 7) 0 calc(var(--spacing-unit) * 3);
}

.post-detail .content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: calc(var(--spacing-unit) * 5) 0 calc(var(--spacing-unit) * 2);
}

.post-detail .content p {
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.post-detail .content ul,
.post-detail .content ol {
  margin: calc(var(--spacing-unit) * 3) 0;
  padding-left: calc(var(--spacing-unit) * 4);
}

.post-detail .content li {
  margin-bottom: calc(var(--spacing-unit) * 1);
}

.post-detail .content code {
  font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
  font-size: 0.875em;
  background-color: var(--color-bg-secondary);
  padding: 3px 8px;
  border-radius: 4px;
}

.post-detail .content pre {
  background-color: var(--color-bg-secondary);
  padding: calc(var(--spacing-unit) * 3);
  border-radius: 8px;
  overflow-x: auto;
  margin: calc(var(--spacing-unit) * 4) 0;
}

.post-detail .content pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.7;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 1);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 5);
  transition: color 0.3s ease;
}

.back-link:hover {
  color: var(--color-primary);
  opacity: 1;
}

.back-link svg {
  transition: transform 0.3s ease;
}

.back-link:hover svg {
  transform: translateX(-4px);
}

footer {
  border-top: 1px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 5) 0;
  text-align: center;
  position: relative;
  z-index: 1;
}

footer p {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

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

.loading {
  display: flex;
  justify-content: center;
  padding: calc(var(--spacing-unit) * 8);
}

.loading::after {
  content: '';
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
  }

  .hero h1 {
    font-size: 2.5rem;
  }

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

  .nav-links {
    gap: calc(var(--spacing-unit) * 3);
  }

  .post-card {
    padding: calc(var(--spacing-unit) * 4);
  }

  .post-detail h1 {
    font-size: 1.75rem;
  }
}