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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: #1a1a1a;
  background: #fff;
  padding: 0 1.25rem;
}

a {
  color: inherit;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

/* Header */
.site-header {
  padding: 2rem 0 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid #e8e8e8;
}

.site-name {
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a {
  font-size: 0.875rem;
  color: #666;
  text-decoration: none;
}

nav a:hover {
  color: #1a1a1a;
}

/* Main */
main {
  padding: 3rem 0 4rem;
}

/* Post list */
.post-list {
  list-style: none;
}

.post-list li {
  padding: 1.75rem 0;
  border-bottom: 1px solid #e8e8e8;
}

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

time {
  font-size: 0.8125rem;
  color: #999;
  display: block;
  margin-bottom: 0.25rem;
}

.post-title {
  font-size: 1.125rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.01em;
  display: inline-block;
}

.post-title:hover {
  opacity: 0.65;
}

.post-excerpt {
  color: #555;
  font-size: 0.9375rem;
  margin-top: 0.4rem;
  line-height: 1.55;
}

/* Page header */
.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid #e8e8e8;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-top: 0.35rem;
}

/* Prose */
.prose p {
  margin-bottom: 1.25rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose h2 {
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 0.75rem;
}

.prose ul,
.prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.prose li {
  margin-bottom: 0.25rem;
}

.prose a:hover {
  opacity: 0.7;
}

.prose code {
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, monospace;
  font-size: 0.875em;
  background: #f4f4f4;
  padding: 0.15em 0.35em;
  border-radius: 3px;
}

/* Back link */
.back-link {
  font-size: 0.875rem;
  color: #666;
  text-decoration: none;
  display: inline-block;
  margin-bottom: 2.5rem;
}

.back-link:hover {
  color: #1a1a1a;
}

/* Footer */
.site-footer {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid #e8e8e8;
  font-size: 0.8125rem;
  color: #aaa;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  body {
    background: #0f0f0f;
    color: #e2e2e2;
  }

  .site-header,
  .post-list li,
  .page-header,
  .site-footer {
    border-color: #222;
  }

  nav a { color: #888; }
  nav a:hover { color: #e2e2e2; }

  .post-excerpt { color: #999; }
  time { color: #666; }

  .back-link { color: #888; }
  .back-link:hover { color: #e2e2e2; }

  .prose code { background: #1e1e1e; }

  .site-footer { color: #555; }
}