:root {
  --text: #1a1a1a;
  --text-light: #666;
  --bg: #fff;
  --bg-alt: #f8f8fa;
  --accent: #0066cc;
  --border: #e0e0e0;
  --code-bg: #f5f5f5;
  --tag-bg: #eef;
  --tag-text: #336;
  --max-width: 680px;
}

[data-theme="dark"] {
  --text: #e0e0e0;
  --text-light: #999;
  --bg: #121212;
  --bg-alt: #1a1a2e;
  --accent: #4da6ff;
  --border: #333;
  --code-bg: #1e1e1e;
  --tag-bg: #1a2a3a;
  --tag-text: #8ab4f8;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --text: #e0e0e0;
    --text-light: #999;
    --bg: #121212;
    --bg-alt: #1a1a2e;
    --accent: #4da6ff;
    --border: #333;
    --code-bg: #1e1e1e;
    --tag-bg: #1a2a3a;
    --tag-text: #8ab4f8;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
}

.wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 40px 0 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.site-header .wrapper {
  position: relative;
}

.site-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.site-description {
  color: var(--text-light);
  font-size: 14px;
  margin-top: 4px;
}

.powered-by {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 2px;
}
.powered-by a {
  color: var(--text-light);
  text-decoration: underline;
}

/* Theme toggle */
.theme-toggle {
  position: absolute;
  top: 0;
  right: 20px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  line-height: 1.4;
}
.theme-toggle:hover {
  border-color: var(--accent);
}

.page-content { padding: 0 0 60px; }

/* Post list */
.post-summary {
  margin-bottom: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--border);
}
.post-summary:last-child { border-bottom: none; }
.post-summary h2 { font-size: 22px; margin-bottom: 6px; }
.post-summary h2 a { color: var(--text); text-decoration: none; }
.post-summary h2 a:hover { color: var(--accent); }
.post-summary p { color: var(--text-light); font-size: 15px; margin-top: 8px; }
.post-summary.pinned {
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 16px 20px;
}
.pin-icon {
  margin-right: 10px;
  font-size: 16px;
  vertical-align: middle;
}

/* Post */
.post-header { margin-bottom: 32px; }
.post-title { font-size: 28px; line-height: 1.3; }
.post-meta {
  color: var(--text-light);
  font-size: 14px;
  margin-top: 8px;
}
.post-category {
  background: var(--code-bg);
  padding: 2px 8px;
  border-radius: 3px;
  margin-left: 8px;
  font-size: 13px;
}
.post-tags { margin-top: 10px; }
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 13px;
  margin-right: 6px;
}

/* Post content */
.post-content h2 { font-size: 22px; margin: 28px 0 12px; }
.post-content h3 { font-size: 18px; margin: 24px 0 10px; }
.post-content p { margin-bottom: 16px; }
.post-content ul, .post-content ol { margin: 0 0 16px 24px; }
.post-content a { color: var(--accent); }

.post-content pre {
  background: var(--code-bg);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 16px;
  font-size: 14px;
  line-height: 1.5;
}
.post-content code {
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.9em;
}
.post-content p code, .post-content li code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
}

/* AI disclosure */
.ai-disclosure {
  margin-top: 32px;
  padding: 12px 16px;
  background: var(--code-bg);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-light);
  border-left: 3px solid var(--border);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  color: var(--text-light);
  font-size: 13px;
}