/* ---------------------------------------------------------------------------
   Personal technical blog — minimal, typography-focused stylesheet.
   No external fonts, no JS. Light theme.
--------------------------------------------------------------------------- */

:root {
  --max-width: 44rem;            /* ~704px comfortable reading column */
  --text:        #1a1a1a;
  --text-muted:  #666666;
  --link:        #1a5fb4;
  --link-hover:  #0d3d80;
  --border:      #e6e6e6;
  --bg:          #ffffff;
  --tag-bg:      #f2f3f5;
  --code-bg:     #f6f8fa;
  --font-body:   -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:   ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

/* --- Header / nav --- */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 0;
  margin-bottom: 2.5rem;
}
.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
}
.site-title {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.site-title:hover { text-decoration: none; }
.site-nav a {
  margin-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.site-nav a:first-child { margin-left: 0; }
.site-nav a:hover { color: var(--link); }

/* --- Main --- */
main { min-height: 60vh; }

h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 0.75rem; }
h2 { font-size: 1.4rem; line-height: 1.3; margin: 2rem 0 0.6rem; }
h3 { font-size: 1.15rem; margin: 1.6rem 0 0.5rem; }

p { margin: 0 0 1.1rem; }

/* --- Home intro --- */
.intro { margin-bottom: 2.5rem; }
.intro p { color: var(--text); }
.intro .social { margin-top: 1rem; }
.intro .social a { margin-right: 1rem; }

/* --- Compact post list (home + tags) --- */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
}
.post-list li a { font-weight: 500; }
.post-list time { color: var(--text-muted); font-size: 0.85rem; white-space: nowrap; }

.recent { margin-bottom: 2rem; }
.recent h2 { margin-top: 0; }

/* --- Article cards (articles page) --- */
.article-list { list-style: none; padding: 0; margin: 0; }
.article-card {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border);
}
.article-card h2 { margin: 0 0 0.25rem; font-size: 1.3rem; }
.article-card > time { color: var(--text-muted); font-size: 0.85rem; }
.article-card .excerpt { margin: 0.5rem 0 0.6rem; color: #333; }

/* --- Tags --- */
.post-tags { margin-top: 0.4rem; }
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 0.1rem 0.55rem;
  margin: 0.15rem 0.3rem 0.15rem 0;
  border-radius: 4px;
}
.tag:hover { color: var(--link); text-decoration: none; }
.tag .count { color: #999; }

.tag-index { margin: 0 0 2rem; }
.tag-section { margin-bottom: 2rem; scroll-margin-top: 1rem; }
.tag-section h2 { margin-bottom: 0.4rem; }

/* --- Single post --- */
.post-header { margin-bottom: 1.5rem; }
.post-title { margin-bottom: 0.35rem; }
.post-date { color: var(--text-muted); font-size: 0.9rem; }

.post-content { margin-bottom: 2rem; }
.post-content img { max-width: 100%; height: auto; }
.post-content ul, .post-content ol { padding-left: 1.4rem; }
.post-content li { margin-bottom: 0.35rem; }
.post-content blockquote {
  margin: 1.2rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--text-muted);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: 0.85rem; }

/* --- Post navigation --- */
.post-back { margin: 1.5rem 0; }
.post-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}
.post-pager .pager-next { text-align: right; }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3.5rem;
  padding: 1.75rem 0;
  font-size: 0.9rem;
}
.site-footer .social a { margin-right: 1.1rem; color: var(--text-muted); }
.site-footer .social a:hover { color: var(--link); }
.copyright { color: var(--text-muted); margin: 0.6rem 0 0; }

/* --- Small screens --- */
@media (max-width: 480px) {
  body { font-size: 17px; }
  h1 { font-size: 1.6rem; }
  .post-list li time { font-size: 0.8rem; }
}