:root {
  --max-content-width: 42rem;
  --max-frame-width: 60rem;
  --color-bg: #ffffff;
  --color-text: #1f1f23;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-soft-bg: #f6f7f9;
  --color-link: #2563eb;
  --color-link-hover: #1d4ed8;
  --color-accent: #2563eb;
  --color-banner-bg: #fef3c7;
  --color-banner-text: #92400e;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --line-height: 1.65;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1115;
    --color-text: #e6e6e6;
    --color-muted: #9aa0a6;
    --color-border: #2a2d34;
    --color-soft-bg: #1a1d23;
    --color-link: #7aa7ff;
    --color-link-hover: #a8c4ff;
    --color-accent: #7aa7ff;
    --color-banner-bg: #3a2e0a;
    --color-banner-text: #f5d97a;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-link);
  text-decoration: none;
}
a:hover { color: var(--color-link-hover); text-decoration: underline; }

#top-banner:empty { display: none; }
#top-banner {
  background: var(--color-banner-bg);
  color: var(--color-banner-text);
  text-align: center;
}
body.old-draft #top-banner { padding: 0.75rem 1rem; }
#top-banner a { color: inherit; text-decoration: underline; }

header {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  max-width: var(--max-frame-width);
  margin: 0 auto;
}

#site-title-container { flex: 1 1 auto; min-width: 0; }
#site-title {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
#site-title:hover { text-decoration: none; color: var(--color-accent); }

#menu-container { font-size: 0.95rem; }
#menu-container a {
  color: var(--color-text);
  padding: 0 0.25rem;
}
#menu-container a:hover { color: var(--color-accent); text-decoration: none; }
#menu-container .active {
  color: var(--color-text);
  font-weight: 700;
  padding: 0 0.25rem;
}

#rss-link-container { line-height: 0; }
#rss-link {
  display: inline-block;
  color: var(--color-muted);
  font-size: 1rem;
  letter-spacing: -0.05em;
}
#rss-link:hover { color: var(--color-accent); text-decoration: none; }
#rss-link-image {
    height: 1em;
}

main {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}

article { margin: 0 0 2.5rem; }

.entry-header h1 {
  font-size: 1.85rem;
  line-height: 1.25;
  margin: 0 0 0.4rem;
  letter-spacing: -0.015em;
}
.entry-header h1 a { color: var(--color-text); }
.entry-header h1 a:hover { color: var(--color-accent); text-decoration: none; }

.entry-body { margin: 1rem 0 1.25rem; }
.entry-body p { margin: 0 0 1rem; }
.entry-body h2 { font-size: 1.4rem; margin: 2rem 0 0.75rem; line-height: 1.3; }
.entry-body h3 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; line-height: 1.3; }
.entry-body h4 { font-size: 1rem; margin: 1.5rem 0 0.5rem; }
.entry-body img,
.entry-body video { max-width: 100%; height: auto; display: block; margin: 1rem auto; }
.entry-body figure { margin: 1.25rem 0; }
.entry-body figcaption {
  font-size: 0.875rem;
  color: var(--color-muted);
  text-align: center;
  margin-top: 0.4rem;
}
.entry-body blockquote {
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  border-left: 3px solid var(--color-border);
  color: var(--color-muted);
}
.entry-body blockquote p:last-child { margin-bottom: 0; }
.entry-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-soft-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
.entry-body pre {
  background: var(--color-soft-bg);
  padding: 0.85rem 1rem;
  overflow-x: auto;
  border-radius: 6px;
  font-size: 0.9rem;
  line-height: 1.5;
}
.entry-body pre code { background: none; padding: 0; font-size: inherit; border-radius: 0; }
.entry-body ul, .entry-body ol { padding-left: 1.5rem; }
.entry-body li { margin: 0.25rem 0; }
.entry-body hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}
.entry-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.entry-body th, .entry-body td {
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.6rem;
  text-align: left;
}
.entry-body th { background: var(--color-soft-bg); }

.entry-footer { margin-top: 1.5rem; }
.post-metainfo {
  font-size: 0.875rem;
  color: var(--color-muted);
}
.post-metainfo a { color: var(--color-muted); }
.post-metainfo a:hover { color: var(--color-accent); }

.synthetic-note {
  background: var(--color-soft-bg);
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.update-prepend {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}
.update-prepend ul { padding-left: 1.25rem; margin: 0.5rem 0; }
.update-prepend hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 0.75rem 0;
}

hr.entry-separator {
  border: 0;
  border-top: 1px dashed var(--color-border);
  margin: 2.5rem 0;
}

.prev-top-next {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2.5rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.prev-top-next .prev { flex: 1 1 0; text-align: left; min-width: 0; }
.prev-top-next .top { flex: 0 0 auto; text-align: center; }
.prev-top-next .top a {
  color: var(--color-muted);
  letter-spacing: -0.1em;
}
.prev-top-next .top a:hover { color: var(--color-accent); text-decoration: none; }
.prev-top-next .next { flex: 1 1 0; text-align: right; min-width: 0; }

.archive h1 {
  font-size: 1.75rem;
  margin: 0 0 1.5rem;
  letter-spacing: -0.015em;
}
.archive dl { margin: 0; }
.archive dt {
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin: 1.75rem 0 0.5rem;
}
.archive dd { margin: 0; padding: 0; }
.archive dd ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.archive dd li {
  margin-left: 1em;
  border-bottom: 1px solid var(--color-border);
}
.archive dd li:last-child { border-bottom: none; }
.archive .archive-item {
  display: block;
  padding: 0.55rem 0;
  color: var(--color-text);
}
.archive .archive-item:hover { color: var(--color-accent); text-decoration: none; }

.update-history {
  margin-top: 2rem;
  padding: 1rem 1.25rem;
  background: var(--color-soft-bg);
  border-radius: 6px;
  font-size: 0.9rem;
}
.update-history-title { margin: 0 0 0.5rem; font-size: 1rem; }
.update-history ul { margin: 0; padding-left: 1.25rem; }
.update-history li { margin: 0.25rem 0; }
.update-history-note {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}
.update-timestamp { color: var(--color-muted); }

footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  max-width: var(--max-frame-width);
  margin: 2rem auto 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}
#left-footer b { color: var(--color-text); font-weight: 600; }
#right-footer a { color: var(--color-muted); }
#right-footer a:hover { color: var(--color-accent); text-decoration: none; }

@media (max-width: 36rem) {
  header { padding: 1rem; gap: 0.75rem; }
  main { padding: 2rem 1rem 2.5rem; }
  footer {
    padding: 1.25rem 1rem;
    flex-direction: column;
    align-items: flex-start;
  }
  .entry-header h1 { font-size: 1.5rem; }
  .prev-top-next { flex-wrap: wrap; }
}