:root {
  --text: #1a1a1a;
  --secondary: #6c6c6c;
  --link: #0050a0;
  --link-hover: #003366;
  --bg: #ffffff;
  --code-bg: #f5f5f5;
  --code-border: #e3e3e3;
  --rule: #e3e3e3;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 17px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  max-width: 720px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.7rem;
  font-weight: 400;
  margin: 0;
  letter-spacing: -0.01em;
}

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

header .tagline {
  color: var(--secondary);
  font-size: 0.95rem;
  margin: 0.3rem 0 0;
}

nav {
  margin-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}

nav a {
  color: var(--secondary);
  text-decoration: none;
  margin-right: 1.25rem;
  font-size: 0.95rem;
}

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

main h2 {
  font-size: 1.4rem;
  font-weight: 400;
  margin: 2rem 0 0.4rem;
  letter-spacing: -0.01em;
}

main h2 a {
  color: var(--text);
  text-decoration: none;
}

main h2 a:hover {
  color: var(--link);
}

main h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 2rem 0 0.5rem;
}

article .meta {
  color: var(--secondary);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

article p {
  margin: 0.85em 0;
}

article ul, article ol {
  margin: 0.85em 0;
  padding-left: 1.5em;
}

article li {
  margin: 0.3em 0;
}

article hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2rem 0;
}

a {
  color: var(--link);
}

a:hover {
  color: var(--link-hover);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 4px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.5;
  margin: 1rem 0;
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
}

p code, li code {
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.88em;
}

pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list > li {
  margin: 1.5rem 0;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.post-list > li:last-child {
  border-bottom: none;
}

.post-list .meta {
  color: var(--secondary);
  font-size: 0.85rem;
  margin: 0 0 0.4rem;
}

.post-list h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 500;
}

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

.post-list h2 a:hover {
  color: var(--link);
}

.post-list .preview {
  margin: 0.5rem 0 0;
  color: var(--text);
}

.archive-year {
  color: var(--secondary);
  font-size: 0.85rem;
  font-weight: 400;
  margin: 1.5rem 0 0.5rem;
}

.archive-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.archive-list li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin: 0.4rem 0;
}

.archive-list .date {
  color: var(--secondary);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  min-width: 7em;
  flex-shrink: 0;
}

.archive-list a {
  text-decoration: none;
  color: var(--text);
}

.archive-list a:hover {
  color: var(--link);
}

.error-page {
  text-align: left;
  padding-top: 2rem;
}

.error-page h2 {
  font-size: 1.6rem;
}

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  color: var(--secondary);
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  html { font-size: 16px; }
  body { padding: 1.5rem 1rem 3rem; }
  header h1 { font-size: 1.5rem; }
  main h2 { font-size: 1.25rem; }
  pre { font-size: 0.82rem; padding: 0.7rem 0.8rem; }
  .archive-list li { flex-direction: column; gap: 0.1rem; }
  .archive-list .date { min-width: 0; }
}