/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Base Typography */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', system-ui, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, monospace;

  --color-bg: #FFFFFF;
  --color-text: #000000;
  --color-text-secondary: #666666;
  --color-border: #E0E0E0;
  --color-tag-bg: #F5F5F5;

  --max-width: 680px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 48px;
  --spacing-xl: 64px;
}

html {
  font-size: 18px;
  line-height: 1.6;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.site-header {
  padding-top: var(--spacing-lg);
  border-bottom: 0.5px solid #000000;
  margin-bottom: 100px;
}

.header-content {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-md);
}

.header-right {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-md);
  margin-left: auto;
}

.site-title {
  text-decoration: none;
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.site-title:hover {
  opacity: 0.7;
}

.wordmark {
  height: 24px;
  width: auto;
  display: block;
}

.header-illustration {
  width: 200px;
  height: auto;
  display: block;
}

.header-right nav {
  margin-bottom: var(--spacing-md);
}

.rss-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

/* Posts List */
.posts-list {
  padding-bottom: var(--spacing-xl);
}

.post-card {
  padding: var(--spacing-lg) 0;
}

.post-card:first-child {
  padding-top: 0;
}

.post-card .post-image {
  margin-bottom: var(--spacing-md);
}

.post-card .post-image img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid #ECECEC;
  border-radius: 8px;
}

.post-card time {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.post-card h2 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

.post-card h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card h2 a:hover {
  text-decoration: underline;
}

.post-excerpt {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.read-more {
  font-size: 0.875rem;
  color: var(--color-text);
  text-decoration: underline;
}

.read-more:hover {
  opacity: 0.7;
}

/* Tags */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.tag {
  font-size: 0.5rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  background: var(--color-tag-bg);
  border-radius: 99px;
  color: var(--color-text-secondary);
}

/* Draft Badge */
.draft-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  background: #FFF3CD;
  color: #856404;
  border-radius: 3px;
  margin-left: var(--spacing-xs);
}

/* Full Post */
.post-full {
  padding-bottom: var(--spacing-xl);
}

.post-header {
  margin-bottom: var(--spacing-lg);
}

.back-link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: var(--spacing-md);
}

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

.post-header time {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.post-header h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

.commit-hash {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.commit-hash a {
  color: inherit;
  text-decoration: underline;
}

/* Post Images */
.post-images {
  margin-bottom: var(--spacing-lg);
}

.post-images figure {
  margin-bottom: var(--spacing-md);
}

.post-images img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid #ECECEC;
  border-radius: 8px;
}

.post-images figcaption {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--spacing-xs);
}

/* Post Body */
.post-body {
  font-size: 1rem;
  line-height: 1.7;
}

.post-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.01em;
}

.post-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

.post-body p {
  margin-bottom: var(--spacing-sm);
}

.post-body ul, .post-body ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
}

.post-body li {
  margin-bottom: var(--spacing-xs);
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-tag-bg);
  padding: 2px 6px;
  border-radius: 3px;
}

.post-body pre {
  background: #F8F8F8;
  padding: var(--spacing-sm);
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: var(--spacing-sm);
}

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

.post-body a {
  color: var(--color-text);
  text-decoration: underline;
}

.post-body a:hover {
  opacity: 0.7;
}

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

/* Footer */
.site-footer {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-lg);
}

.site-footer p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-align: center;
}

/* Responsive */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  .site-header {
    padding-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }

  .header-content {
    gap: var(--spacing-sm);
  }

  .wordmark {
    height: 18px;
  }

  .header-illustration {
    width: 140px;
  }

  .post-card {
    padding: var(--spacing-md) 0;
  }

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

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