:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #666666;
  --accent: #0070f3;
  --border: #e5e5e5;
  --max-width: 680px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f0f0f;
    --text: #e5e5e5;
    --muted: #999999;
    --accent: #4da3ff;
    --border: #2a2a2a;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f0f0f;
  --text: #e5e5e5;
  --muted: #999999;
  --accent: #4da3ff;
  --border: #2a2a2a;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #666666;
  --accent: #0070f3;
  --border: #e5e5e5;
  color-scheme: light;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.site-header {
  padding: 1.75rem 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

nav {
  display: flex;
  align-items: center;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}

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

[hidden] { display: none !important; }

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  margin-left: 1.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  line-height: 1;
}

.theme-toggle:hover { color: var(--text); }
.theme-toggle svg { display: block; }

/* Main */
main { padding: 4.5rem 1rem; }

/* Home */
.page-heading {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85rem;
}

.post-list {
  list-style: none;
}

.post-list li {
  padding: 1.5rem 0;
}

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

.post-meta {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.post-link {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.post-link:hover { color: var(--accent); }

.post-excerpt {
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 0.4rem;
}

/* Post */
.post-header { margin-bottom: 2.5rem; }

.post-title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.post-content h2 { font-size: 1.4rem; margin: 2rem 0 0.75rem; }
.post-content h3 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; }
.post-content p { margin-bottom: 1.25rem; }
.post-content ul, .post-content ol { margin: 0 0 1.25rem 1.5rem; }
.post-content li { margin-bottom: 0.4rem; }
.post-content a { color: var(--accent); }
.post-content blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  color: var(--muted);
  margin: 1.5rem 0;
}
.post-content pre {
  background: var(--border);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1.25rem;
  font-family: var(--mono);
  font-size: 0.875rem;
}
.post-content code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--border);
  padding: 0.15em 0.35em;
  border-radius: 3px;
}
.post-content pre code { background: none; padding: 0; }

.back-link {
  display: inline-block;
  margin-top: 3rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}
.back-link:hover { color: var(--text); }

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}