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

:root {
  --bg: #fff;
  --text: #111;
  --muted: #666;
  --border: #ddd;
  --link: #111;
}

[data-theme="dark"] {
  --bg: #1a1a1a;
  --text: #d4d4d4;
  --muted: #888;
  --border: #333;
  --link: #d4d4d4;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  max-width: 740px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  transition: background 0.2s, color 0.2s;
}

a {
  color: var(--link);
  text-decoration: underline;
}
a:visited { color: var(--link); }
a:hover { opacity: 0.7; }

/* Header */
header {
  margin-bottom: 40px;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

header h1 {
  font-size: 1.1rem;
  font-weight: bold;
}

header h1 a {
  text-decoration: none;
  color: var(--text);
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  line-height: 1;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.nav-links a {
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--text);
}
.nav-links a:hover { text-decoration: underline; opacity: 1; }

/* Homepage */
.home-intro {
  margin-bottom: 40px;
  font-size: 1rem;
}
.home-intro p { margin-bottom: 0.75rem; }

.recent-posts h2 {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 12px;
}

.all-posts {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--muted);
}
.all-posts:hover { text-decoration: underline; opacity: 1; }

/* Post list */
.post-list {
  list-style: disc;
  padding-left: 1.2rem;
}
.post-list li {
  padding: 3px 0;
  font-size: 0.95rem;
}
.post-list a {
  text-decoration: none;
  color: var(--text);
}
.post-list a:hover { text-decoration: underline; opacity: 1; }

.post-date {
  color: var(--muted);
  font-size: 0.875rem;
  margin-left: 8px;
}

/* Page headers */
.page-list h1 {
  font-size: 1.3rem;
  font-weight: bold;
  margin-bottom: 20px;
}

/* Single post */
.post-header {
  margin-bottom: 32px;
}
.post-header h1 {
  font-size: 1.4rem;
  font-weight: bold;
  line-height: 1.4;
  margin-bottom: 8px;
}
.post-header time {
  color: var(--muted);
  font-size: 0.875rem;
}

.post-content {
  font-size: 1rem;
  line-height: 1.75;
}
.post-content p { margin-bottom: 1.2em; }
.post-content h2 {
  font-size: 1.1rem;
  font-weight: bold;
  margin: 1.8em 0 0.5em;
}
.post-content h3 {
  font-size: 1rem;
  font-weight: bold;
  margin: 1.4em 0 0.4em;
}
.post-content a { color: var(--link); }
.post-content ul, .post-content ol {
  margin-bottom: 1.2em;
  padding-left: 1.4em;
}
.post-content li { margin-bottom: 0.3em; }
.post-content blockquote {
  border-left: 3px solid var(--border);
  margin: 1.4em 0;
  padding-left: 1rem;
  color: var(--muted);
}
.post-content code {
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 0.85em;
  background: var(--border);
  padding: 2px 4px;
  border-radius: 3px;
}
.post-content pre {
  background: var(--border);
  padding: 14px;
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: 1.2em;
}
.post-content pre code { background: none; padding: 0; }
.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}
.post-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.4em auto;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}
.post-nav a { color: var(--muted); text-decoration: none; }
.post-nav a:hover { text-decoration: underline; opacity: 1; }
.post-nav .next { text-align: right; margin-left: auto; }

footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--muted);
}
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { text-decoration: underline; opacity: 1; }

@media (max-width: 600px) {
  body { padding: 24px 16px 60px; }
}