/* ============================================================
   Design tokens
   ============================================================ */
:root {
  --color-bg:        #ffffff;
  --color-text:      #111111;
  --color-green:     #009900;
  --color-dark-red:  #990000;
  --color-link:      #0000ee;
  --color-visited:   #551a8b;
  --color-border:    #dddddd;
  --color-muted:     #666666;
  --color-tag-bg:    #f0f0f0;
  --font:            system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max-width:       1100px;
  --radius:          4px;
}

/* ============================================================
   Reset / base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

img { max-width: 100%; height: auto; display: block; }

/* ============================================================
   Navigation
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Hero portfolio link */
.hero-portfolio-link {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-green);
  text-decoration: none;
  transition: opacity 0.15s;
}
.hero-portfolio-link:visited { color: var(--color-green); }
.hero-portfolio-link:hover   { opacity: 0.75; text-decoration: none; }

/* Search */
.search-wrap {
  position: relative;
}

.search-input {
  width: 220px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.15s, width 0.2s;
}
.search-input:focus {
  border-color: var(--color-green);
  width: 280px;
}

/* Results dropdown */
.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 340px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  z-index: 200;
  overflow: hidden;
}
.search-results.open { display: block; }

.sr-item {
  display: block;
  padding: 10px 14px;
  border-bottom: 1px solid #f0f0f0;
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.1s;
}
.sr-item:last-child { border-bottom: none; }
.sr-item:hover,
.sr-item:focus { background: #f5f5f5; outline: none; text-decoration: none; color: var(--color-text); }
.sr-item:visited { color: var(--color-text); }

.sr-title {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 3px;
  line-height: 1.3;
}

.sr-title mark {
  background: rgba(0,153,0,0.15);
  color: var(--color-green);
  border-radius: 2px;
  padding: 0 1px;
}

.sr-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sr-tag {
  font-size: 0.7rem;
  font-weight: 600;


  color: var(--color-muted);
  background: var(--color-tag-bg);
  padding: 1px 6px;
  border-radius: 10px;
}

.sr-date {
  font-size: 0.75rem;
  color: var(--color-muted);
}

.search-empty {
  padding: 14px;
  font-size: 0.875rem;
  color: var(--color-muted);
  text-align: center;
}

/* Responsive: collapse search on small screens */
@media (max-width: 600px) {
  .search-input       { width: 140px; }
  .search-input:focus { width: 180px; }
  .search-results     { width: 280px; right: -20px; }
  .nav-portfolio      { display: none; }
}

/* ============================================================
   Main content wrapper
   ============================================================ */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 40px 20px;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.hero-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  flex-shrink: 0;
  object-fit: cover;
  border: 2px solid var(--color-border);
}

.hero-text h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.hero-text p {
  color: var(--color-muted);
  font-size: 0.95rem;
  max-width: 560px;
}

/* ============================================================
   Section headings
   ============================================================ */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 20px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  border-left: 3px solid var(--color-green);
  padding-left: 10px;
}

.section-link {
  font-size: 0.85rem;
  color: var(--color-green);
}
.section-link:visited { color: var(--color-green); }

.section-block {
  margin-bottom: 56px;
}

/* ============================================================
   Card grid
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  border-radius: var(--radius);
}
.card-link:visited { color: inherit; }
.card-link:hover   { text-decoration: none; }

.card {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
  height: 100%;
}

.card-link:hover .card {
  border-color: var(--color-green);
  box-shadow: 0 2px 8px rgba(0,153,0,0.08);
}

.card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-muted);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;


}

.reading-time {
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-left: auto;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-date {
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-top: auto;
  padding-top: 8px;
}

/* ============================================================
   Page header (for category pages)
   ============================================================ */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-subtitle {
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ============================================================
   Filter / sort toolbar
   ============================================================ */
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.tag-filter-btn {
  padding: 5px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-bg);
  font-size: 0.82rem;
  font-family: var(--font);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
  color: var(--color-muted);
}

.tag-filter-btn:hover,
.tag-filter-btn.active {
  border-color: var(--color-green);
  background: var(--color-green);
  color: #fff;
}

.sort-select {
  margin-left: auto;
  padding: 5px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-family: var(--font);
  background: var(--color-bg);
  cursor: pointer;
  outline: none;
}
.sort-select:focus { border-color: var(--color-green); }

/* ============================================================
   Featured post (large card)
   ============================================================ */
.featured-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 48px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.featured-card:hover {
  border-color: var(--color-green);
  box-shadow: 0 2px 12px rgba(0,153,0,0.08);
}

.featured-label {
  font-size: 0.72rem;
  font-weight: 700;


  color: var(--color-green);
  margin-bottom: 10px;
}

.featured-card .card-title {
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.featured-card .card-desc {
  -webkit-line-clamp: 3;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

/* ============================================================
   Post article
   ============================================================ */
.post-article {
  max-width: 760px;
  margin: 0 auto;
}

.back-link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 24px;
}
.back-link:visited { color: var(--color-muted); }
.back-link:hover   { color: var(--color-green); }

.post-meta {
  margin-bottom: 20px;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.post-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.post-date,
.post-reading-time {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.mark-read-btn {
  margin-left: auto;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-bg);
  font-size: 0.8rem;
  font-family: var(--font);
  cursor: pointer;
  color: var(--color-muted);
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.mark-read-btn:hover { border-color: var(--color-green); color: var(--color-green); }
.mark-read-btn.is-read { border-color: var(--color-green); background: var(--color-green); color: #fff; }

.post-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}

.post-description {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: 36px;
  line-height: 1.6;
}

/* ============================================================
   Prose (post body)
   ============================================================ */
.prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  font-weight: 700;
  line-height: 1.3;
  margin: 2em 0 0.6em;
  color: var(--color-text);
}

.prose h1 { font-size: 1.75rem; }
.prose h2 { font-size: 1.4rem; border-bottom: 1px solid var(--color-border); padding-bottom: 6px; }
.prose h3 { font-size: 1.15rem; }
.prose h4 { font-size: 1rem; }

.prose p  { margin-bottom: 1.2em; }
.prose ul,
.prose ol { margin: 0 0 1.2em 1.5em; }
.prose li { margin-bottom: 0.5em; line-height: 1.6; }

/* References section */
.prose h2:last-of-type + ol,
.prose ol.references { list-style: decimal; }
.prose li > a { word-break: break-all; font-size: 0.85rem; color: var(--color-link); }
.prose li > a:visited { color: var(--color-visited); }

.prose blockquote {
  border-left: 4px solid var(--color-green);
  margin: 1.5em 0;
  padding: 12px 20px;
  background: #f8f8f8;
  color: var(--color-muted);
  font-style: italic;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2em 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9rem;
}

.prose th,
.prose td {
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.prose th {
  background: #f5f5f5;
  font-weight: 700;
}

.prose tr:nth-child(even) td { background: #fafafa; }

/* Inline code */
.prose code {
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 0.875em;
  background: #f0f0f0;
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--color-dark-red);
}

/* Code blocks (Rouge generates <div class="highlight"><pre>...) */
.prose .highlight,
.prose pre {
  background: #1e1e1e;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.5em 0;
  padding: 0;
}

.prose .highlight pre,
.prose pre code {
  background: transparent;
  color: #d4d4d4;
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 20px 24px;
  display: block;
  overflow-x: auto;
  border-radius: 0;
}

/* Override inline code style inside code blocks */
.prose pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* KaTeX display blocks */
.katex-display {
  overflow-x: auto;
  padding: 4px 0;
  margin: 1.5em 0;
}

/* Mermaid diagrams */
.prose .mermaid {
  text-align: center;
  margin: 2em 0;
}

/* Images in prose */
.prose img {
  border-radius: var(--radius);
  margin: 1.5em auto;
}

/* ============================================================
   404 page
   ============================================================ */
.page-404 {
  text-align: center;
  padding: 80px 20px;
}

.page-404 h1 {
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-dark-red);
  margin-bottom: 16px;
}

.page-404 p {
  color: var(--color-muted);
  margin-bottom: 24px;
  font-size: 1.1rem;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-nav {
  display: flex;
  gap: 16px;
}

.footer-nav a {
  color: var(--color-muted);
  font-size: 0.85rem;
}
.footer-nav a:visited { color: var(--color-muted); }
.footer-nav a:hover   { color: var(--color-green); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .post-title { font-size: 1.5rem; }

  #search-input { width: 160px; }
}

@media (max-width: 480px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .nav-inner {
    gap: 12px;
  }

  #search-input { width: 120px; }

  .section-header { flex-direction: column; gap: 4px; }
  .footer-inner   { flex-direction: column; text-align: center; }
}

/* ============================================================
   Rouge syntax highlighting — Monokai dark theme
   ============================================================ */
.highlight { background: #272822; border-radius: 4px; margin: 1.5em 0; overflow-x: auto; }
.highlight pre { background: #272822; color: #f8f8f2; font-family: "JetBrains Mono","Fira Code","Cascadia Code",monospace; font-size: 0.875rem; line-height: 1.65; padding: 20px 24px; margin: 0; overflow-x: auto; }
.prose pre code { background: transparent; color: inherit; padding: 0; font-size: inherit; border-radius: 0; }

.highlight .hll { background-color: #49483e }
.highlight .c  { color: #75715e } /* Comment */
.highlight .err { color: #960050; background-color: #1e0010 }
.highlight .k  { color: #66d9ef } /* Keyword */
.highlight .l  { color: #ae81ff } /* Literal */
.highlight .n  { color: #f8f8f2 } /* Name */
.highlight .o  { color: #f92672 } /* Operator */
.highlight .p  { color: #f8f8f2 } /* Punctuation */
.highlight .cm { color: #75715e } /* Comment.Multiline */
.highlight .cp { color: #75715e } /* Comment.Preproc */
.highlight .c1 { color: #75715e } /* Comment.Single */
.highlight .cs { color: #75715e } /* Comment.Special */
.highlight .gd { color: #f92672 } /* Generic.Deleted */
.highlight .ge { font-style: italic }
.highlight .gi { color: #a6e22e } /* Generic.Inserted */
.highlight .gs { font-weight: bold }
.highlight .gu { color: #75715e } /* Generic.Subheading */
.highlight .kc { color: #66d9ef } /* Keyword.Constant */
.highlight .kd { color: #66d9ef } /* Keyword.Declaration */
.highlight .kn { color: #f92672 } /* Keyword.Namespace */
.highlight .kp { color: #66d9ef } /* Keyword.Pseudo */
.highlight .kr { color: #66d9ef } /* Keyword.Reserved */
.highlight .kt { color: #66d9ef } /* Keyword.Type */
.highlight .ld { color: #e6db74 } /* Literal.Date */
.highlight .m  { color: #ae81ff } /* Literal.Number */
.highlight .s  { color: #e6db74 } /* Literal.String */
.highlight .na { color: #a6e22e } /* Name.Attribute */
.highlight .nb { color: #f8f8f2 } /* Name.Builtin */
.highlight .nc { color: #a6e22e } /* Name.Class */
.highlight .no { color: #66d9ef } /* Name.Constant */
.highlight .nd { color: #a6e22e } /* Name.Decorator */
.highlight .ni { color: #f8f8f2 } /* Name.Entity */
.highlight .ne { color: #a6e22e } /* Name.Exception */
.highlight .nf { color: #a6e22e } /* Name.Function */
.highlight .nl { color: #f8f8f2 } /* Name.Label */
.highlight .nn { color: #f8f8f2 } /* Name.Namespace */
.highlight .nx { color: #a6e22e } /* Name.Other */
.highlight .py { color: #f8f8f2 } /* Name.Property */
.highlight .nt { color: #f92672 } /* Name.Tag */
.highlight .nv { color: #f8f8f2 } /* Name.Variable */
.highlight .ow { color: #f92672 } /* Operator.Word */
.highlight .w  { color: #f8f8f2 } /* Text.Whitespace */
.highlight .mf { color: #ae81ff } /* Literal.Number.Float */
.highlight .mh { color: #ae81ff } /* Literal.Number.Hex */
.highlight .mi { color: #ae81ff } /* Literal.Number.Integer */
.highlight .mo { color: #ae81ff } /* Literal.Number.Oct */
.highlight .sb { color: #e6db74 } /* Literal.String.Backtick */
.highlight .sc { color: #e6db74 } /* Literal.String.Char */
.highlight .sd { color: #e6db74 } /* Literal.String.Doc */
.highlight .s2 { color: #e6db74 } /* Literal.String.Double */
.highlight .se { color: #ae81ff } /* Literal.String.Escape */
.highlight .sh { color: #e6db74 } /* Literal.String.Heredoc */
.highlight .si { color: #e6db74 } /* Literal.String.Interpol */
.highlight .sx { color: #e6db74 } /* Literal.String.Other */
.highlight .sr { color: #e6db74 } /* Literal.String.Regex */
.highlight .s1 { color: #e6db74 } /* Literal.String.Single */
.highlight .ss { color: #e6db74 } /* Literal.String.Symbol */
.highlight .bp { color: #f8f8f2 } /* Name.Builtin.Pseudo */
.highlight .vc { color: #f8f8f2 } /* Name.Variable.Class */
.highlight .vg { color: #f8f8f2 } /* Name.Variable.Global */
.highlight .vi { color: #f8f8f2 } /* Name.Variable.Instance */
.highlight .il { color: #ae81ff } /* Literal.Number.Integer.Long */

/* Mermaid diagram centering */
.prose .mermaid { text-align: center; margin: 2em 0; }

/* ============================================================
   Nav — home button
   ============================================================ */
.nav-home {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  margin-right: 12px;
  flex-shrink: 0;
  white-space: nowrap;
}
.nav-home:visited { color: var(--color-text); }
.nav-home:hover   { color: var(--color-green); text-decoration: none; }

/* ============================================================
   Post — view counter
   ============================================================ */
.post-views {
  font-size: 0.85rem;
  color: var(--color-muted);
}
.post-views:not(:empty)::before { content: '· '; }

/* ============================================================
   Post — next / previous navigation
   ============================================================ */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.post-nav-btn {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 46%;
  text-decoration: none;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s;
}
.post-nav-btn:hover   { border-color: var(--color-green); text-decoration: none; }
.post-nav-btn:visited { color: inherit; }

.post-nav-next { text-align: right; margin-left: auto; }

.post-nav-label {
  font-size: 0.75rem;
  font-weight: 600;


  color: var(--color-green);
}

.post-nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.35;
}

@media (max-width: 480px) {
  .post-nav { flex-direction: column; }
  .post-nav-btn { max-width: 100%; }
  .post-nav-next { text-align: left; margin-left: 0; }
}

/* ============================================================
   Card — read badge (small tick, top-right corner)
   ============================================================ */
.card-read-badge {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-green);
  color: #fff;
  font-size: 12px;
  line-height: 20px;
  text-align: center;
  pointer-events: none;
}

/* Card view count */
.card-views {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-left: auto;
}
.card-views:empty { display: none; }

/* ============================================================
   Table of contents
   ============================================================ */
.toc {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fafafa;
  padding: 16px 20px;
  margin: 0 0 36px;
  font-size: 0.875rem;
}

.toc-title {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.toc-list {
  margin: 0;
  padding-left: 1.2rem;
  list-style: decimal;
}

.toc-item { margin-bottom: 4px; line-height: 1.4; }
.toc-item--sub { padding-left: 1rem; font-size: 0.84rem; }

.toc-link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.toc-link:hover,
.toc-link--active { color: var(--color-green); text-decoration: none; }
.toc-link--active { font-weight: 600; }

/* ============================================================
   Copy button on code blocks
   ============================================================ */
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-family: var(--font);
  font-weight: 600;
  background: rgba(255,255,255,0.12);
  color: #aaaaaa;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 3px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s;
  z-index: 2;
}
.highlight:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: rgba(255,255,255,0.2); color: #fff; }
.copy-btn--done { background: rgba(0,153,0,0.3); color: #88dd88; border-color: rgba(0,153,0,0.4); }

/* ============================================================
   Related posts
   ============================================================ */
.related-posts {
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.related-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.related-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.15s;
}
.related-card:hover { border-color: var(--color-green); text-decoration: none; color: var(--color-text); }
.related-card:visited { color: var(--color-text); }

.related-card-title {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text);
}

.related-card-meta {
  font-size: 0.75rem;
  color: var(--color-muted);
}

.video-embed {
  position: relative;
  width: 100%;
  margin: 2rem 0;
  border-radius: 8px;
  overflow: hidden;
}

.video-embed iframe {
  display: block;
  width: 100%;
  border-radius: 8px;
}