/* CSS Variables for Light/Dark Mode */
:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #fafafa;
  --color-text: #0a0a0a;
  --color-text-secondary: #737373;
  --color-text-tertiary: #a3a3a3;
  --color-border: #e5e5e5;
  --color-code-bg: #f5f5f5;
  --color-link: #0a0a0a;
  --color-link-hover: #525252;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #171717;
    --color-text: #fafafa;
    --color-text-secondary: #a3a3a3;
    --color-text-tertiary: #737373;
    --color-border: #262626;
    --color-code-bg: #171717;
    --color-link: #fafafa;
    --color-link-hover: #d4d4d4;
  }
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  padding: 0;
  margin: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Links */
a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: all 0.2s ease;
}

a:hover {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

/* Header */
.site-header {
  padding: 80px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.site-title a {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.5px;
  border: none;
  color: var(--color-text);
}

.site-title a:hover {
  color: var(--color-text-secondary);
}

.site-subtitle {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Main */
.site-main {
  padding: 60px 0;
  min-height: calc(100vh - 300px);
}

/* Post List */
.post-list {
  margin: 0;
}

.post-item {
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border);
}

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

.post-date {
  display: block;
  font-size: 13px;
  color: var(--color-text-tertiary);
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.post-title {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.post-title a {
  border: none;
  color: var(--color-text);
}

.post-title a:hover {
  color: var(--color-text-secondary);
}

.post-excerpt {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-top: 12px;
}

/* Single Post */
.post {
  max-width: 100%;
}

.post-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.post-header .post-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.post-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  margin-top: 40px;
  margin-bottom: 16px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.5px;
  color: var(--color-text);
}

.post-content h2 {
  font-size: 24px;
}

.post-content h3 {
  font-size: 20px;
}

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

.post-content ul,
.post-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.post-content img {
  max-width: 100%;
  height: auto;
  margin: 32px 0;
  border-radius: 4px;
}

.post-content code {
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', 'Courier New', monospace;
  font-size: 14px;
  padding: 3px 6px;
  background: var(--color-code-bg);
  color: var(--color-text);
  border-radius: 3px;
}

.post-content pre {
  background: var(--color-code-bg);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--color-border);
}

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

.post-content blockquote {
  margin: 24px 0;
  padding-left: 20px;
  border-left: 3px solid var(--color-border);
  color: var(--color-text-secondary);
  font-style: italic;
}

.post-content a {
  color: var(--color-text);
  border-bottom: 1px solid var(--color-text-tertiary);
}

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

.post-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 32px 0;
}

/* Post Footer */
.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.post-tags .tag {
  font-size: 13px;
  color: var(--color-text-secondary);
  border: none;
  padding: 4px 12px;
  background: var(--color-bg-secondary);
  border-radius: 12px;
}

.post-tags .tag:hover {
  color: var(--color-text);
  background: var(--color-code-bg);
}

/* Post Navigation */
.post-nav {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  gap: 24px;
}

.post-nav a {
  font-size: 14px;
  border: none;
  max-width: 48%;
  color: var(--color-text-secondary);
}

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

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

.post-nav .next {
  text-align: right;
  margin-left: auto;
}

/* Comments Section */
.post-comments {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}

.comments-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
  color: var(--color-text);
}

.post-comments .giscus {
  margin-top: 24px;
}

.post-comments .giscus-frame {
  border: none;
}

/* Archive */
.archive-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 40px;
  letter-spacing: -0.5px;
  color: var(--color-text);
}

.archive-year {
  margin-bottom: 32px;
}

.archive-year h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text-tertiary);
}

.archive-item {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  align-items: baseline;
}

.archive-date {
  font-size: 13px;
  color: var(--color-text-tertiary);
  min-width: 48px;
}

.archive-item a {
  font-size: 15px;
  flex: 1;
  color: var(--color-text);
  border-bottom-color: var(--color-border);
}

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

/* Page */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--color-text);
}

.page-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
}

.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4,
.page-content h5,
.page-content h6 {
  margin-top: 32px;
  margin-bottom: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.page-content p {
  margin-bottom: 16px;
}

.page-content ul,
.page-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.page-content a {
  color: var(--color-text);
  border-bottom: 1px solid var(--color-text-tertiary);
}

.page-content a:hover {
  color: var(--color-text-secondary);
  border-bottom-color: var(--color-text-secondary);
}

/* Pagination */
.pagination {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
  gap: 16px;
}

.pagination a,
.pagination .current,
.pagination .space {
  padding: 8px 12px;
  font-size: 14px;
  border: none;
}

.pagination .current {
  color: var(--color-text-tertiary);
}

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

.pagination a:hover {
  color: var(--color-text);
}

/* Footer */
.site-footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-tertiary);
}

/* Selection */
::selection {
  background: var(--color-text);
  color: var(--color-bg);
}

::-moz-selection {
  background: var(--color-text);
  color: var(--color-bg);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .site-header {
    padding: 60px 0 40px;
  }

  .site-main {
    padding: 40px 0;
  }

  .post-header .post-title {
    font-size: 28px;
  }

  .post-title {
    font-size: 22px;
  }

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

  .post-nav a {
    max-width: 100%;
  }

  .post-nav .next {
    margin-left: 0;
  }

  .post-comments {
    margin-top: 40px;
    padding-top: 32px;
  }

  .comments-title {
    font-size: 18px;
  }
}

/* Smooth transitions for theme switching */
* {
  transition-property: background-color, border-color, color;
  transition-duration: 0.3s;
  transition-timing-function: ease;
}

/* Don't transition on first load */
body.no-transitions * {
  transition: none !important;
}

/* Footer link style */
.site-footer a {
  color: var(--color-text-tertiary);
  border: none;
}

.site-footer a:hover {
  color: var(--color-text);
}