/* ======================================================================
   MrPreciousTech — custom Jekyll theme (no frameworks, no build step)
   1. Tokens & themes
   2. Reset & base
   3. Utilities (container, buttons, eyebrow, sections)
   4. Header & navigation
   5. Hero
   6. Cards (post cards, featured card)
   7. Pagination, tags, archive, search, projects
   8. Subscribe / about teaser
   9. Footer, back-to-top
   10. Post layout (progress, TOC, share, author, prev/next, related)
   11. Prose (typography for Markdown content)
   12. Code highlighting (rouge .highlight tokens, both themes)
   13. 404
   14. Responsive
   15. Motion preferences & print
   ====================================================================== */

/* ---------- 1. Tokens & themes ---------- */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  --bg: #ffffff;
  --bg-soft: #f6f7fa;
  --bg-raised: #ffffff;
  --text: #101828;
  --muted: #5b6474;
  --faint: #8a94a6;
  --border: #e4e7ee;
  --border-strong: #cdd3df;

  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef0ff;
  --accent-text: #ffffff;
  --accent-2: #9333ea;

  --code-bg: #f2f4f8;
  --code-text: #1f2937;
  --code-border: #e4e7ee;
  --callout-bg: #eef4ff;
  --callout-border: #4f46e5;

  --header-bg: rgba(255, 255, 255, 0.85);
  --card-shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 16px -4px rgba(16, 24, 40, 0.08);
  --card-shadow-hover: 0 2px 4px rgba(16, 24, 40, 0.08), 0 12px 32px -8px rgba(16, 24, 40, 0.18);

  --radius: 14px;
  --radius-sm: 9px;
  --max-width: 1120px;
  --max-narrow: 760px;
}

[data-theme="dark"] {
  --bg: #0b0f19;
  --bg-soft: #111627;
  --bg-raised: #131a2e;
  --text: #e7ebf3;
  --muted: #9aa4b8;
  --faint: #6b7590;
  --border: #202941;
  --border-strong: #2e3a58;

  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --accent-soft: #1c2450;
  --accent-text: #0b0f19;
  --accent-2: #c084fc;

  --code-bg: #0f1526;
  --code-text: #dbe2f1;
  --code-border: #202941;
  --callout-bg: #141b38;
  --callout-border: #818cf8;

  --header-bg: rgba(11, 15, 25, 0.85);
  --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 16px -4px rgba(0, 0, 0, 0.5);
  --card-shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.5), 0 12px 32px -8px rgba(0, 0, 0, 0.6);
}

/* ---------- 2. Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  transition: background-color 0.25s ease, color 0.25s ease;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
  text-wrap: balance;
}

p { margin: 0 0 1.1em; }

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

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: var(--accent); color: #fff; }
[data-theme="dark"] ::selection { color: #0b0f19; }

[hidden] { display: none !important; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 100;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 1rem; color: #fff; text-decoration: none; }

/* ---------- 3. Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  width: 100%;
  max-width: var(--max-narrow);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 4rem 0; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-head h2 { margin: 0; font-size: 1.9rem; }

.section-link { white-space: nowrap; font-weight: 600; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.muted { color: var(--muted); font-weight: 400; font-size: 0.75em; }
.lead { font-size: 1.2rem; color: var(--muted); line-height: 1.6; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  text-decoration: none !important;
}

.btn-primary { background: var(--accent); color: #fff !important; }
[data-theme="dark"] .btn-primary { color: #0b0f19 !important; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }

.btn-outline { border-color: var(--border-strong); color: var(--text) !important; background: transparent; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent) !important; }

.btn.disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.gradient-text {
  background: linear-gradient(100deg, var(--accent) 10%, var(--accent-2) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 4. Header & navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.site-header.scrolled { border-bottom-color: var(--border); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text) !important;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }
.brand-mark { display: inline-flex; }
.brand-text { white-space: nowrap; }

.site-nav { margin-left: auto; }
.site-nav ul {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  display: inline-block;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--text); background: var(--bg-soft); text-decoration: none; }
.site-nav a.active { color: var(--accent); background: var(--accent-soft); }

.header-actions { display: flex; align-items: center; gap: 0.4rem; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.icon-btn:hover { background: var(--bg-soft); color: var(--text); }

.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.menu-toggle { display: none; }

.mobile-menu {
  border-top: 1px solid var(--border);
  padding: 0.5rem 1.5rem 1rem;
  background: var(--bg);
}
.mobile-menu ul { list-style: none; margin: 0; padding: 0; }
.mobile-menu a {
  display: block;
  padding: 0.7rem 0.5rem;
  border-radius: 8px;
  color: var(--text);
  font-weight: 600;
}
.mobile-menu a:hover { background: var(--bg-soft); text-decoration: none; }
.mobile-menu a.active { color: var(--accent); }

/* ---------- 5. Hero ---------- */
.hero {
  padding: 4.5rem 0 3.5rem;
  background:
    radial-gradient(600px 300px at 15% 0%, var(--accent-soft), transparent 70%),
    radial-gradient(500px 260px at 90% 20%, var(--accent-soft), transparent 70%);
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}
.hero-copy, .hero-visual { min-width: 0; }

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.55); }
  70% { box-shadow: 0 0 0 10px rgba(34, 197, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.hero-title { font-size: clamp(2.2rem, 5vw, 3.4rem); margin-bottom: 1rem; }
.hero-tagline { font-size: 1.15rem; color: var(--muted); max-width: 34rem; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin: 1.6rem 0 2rem; }

.hero-stats { display: flex; gap: 2.2rem; margin: 0; padding: 0; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats dt { order: 2; font-size: 0.8rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em; }
.hero-stats dd { order: 1; margin: 0; font-size: 1.5rem; font-weight: 800; }

/* Terminal card */
.terminal {
  background: #0d1222;
  border: 1px solid #232c47;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 60px -20px rgba(79, 70, 229, 0.45);
  transform: rotate(1.5deg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
  background: #151c33;
}
.term-dot { width: 11px; height: 11px; border-radius: 50%; background: #3a4566; }
.term-dot:nth-child(1) { background: #f87171; }
.term-dot:nth-child(2) { background: #fbbf24; }
.term-dot:nth-child(3) { background: #34d399; }
.term-title { margin-left: auto; color: #7c87a5; font-size: 0.75rem; }
.terminal-body { padding: 1.1rem 1.2rem 1.3rem; color: #dbe2f1; }
.terminal-body p { margin: 0 0 0.55rem; }
.terminal-body p:last-child { margin-bottom: 0; }
.term-prompt { color: #818cf8; font-weight: 700; margin-right: 0.5rem; }
.term-out { color: #9aa4c2; padding-left: 1.3rem; }
.term-cursor {
  display: inline-block;
  width: 9px;
  height: 1.1em;
  background: #818cf8;
  vertical-align: text-bottom;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- 6. Cards ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.post-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); border-color: var(--border-strong); }

.post-card-cover {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 150px;
  position: relative;
  overflow: hidden;
}
.post-card-cover:hover { text-decoration: none; }
.cover-glyph {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

/* Auto-generated gradient covers (chosen per-post via `accent:` front matter) */
.cover-indigo { background: linear-gradient(135deg, #4f46e5, #7c3aed 60%, #2563eb); }
.cover-violet { background: linear-gradient(135deg, #7c3aed, #a855f7 55%, #ec4899); }
.cover-teal { background: linear-gradient(135deg, #0d9488, #14b8a6 55%, #0ea5e9); }
.cover-amber { background: linear-gradient(135deg, #d97706, #f59e0b 55%, #ef4444); }
.cover-rose { background: linear-gradient(135deg, #e11d48, #f43f5e 55%, #fb7185); }
.cover-slate { background: linear-gradient(135deg, #334155, #475569 55%, #64748b); }
.post-card-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.22) 1.2px, transparent 1.2px);
  background-size: 18px 18px;
}

.post-card-body { display: flex; flex-direction: column; gap: 0.6rem; padding: 1.4rem 1.4rem 1.5rem; flex: 1; }
.post-card-tags { display: flex; flex-wrap: wrap; gap: 0.6rem; font-size: 0.82rem; font-weight: 600; }
.post-card-tags a { color: var(--faint); }
.post-card-tags a:hover { color: var(--accent); }
.post-card-title { font-size: 1.2rem; margin: 0; }
.post-card-title a { color: var(--text); }
.post-card-title a:hover { color: var(--accent); text-decoration: none; }
.post-card-excerpt { color: var(--muted); font-size: 0.95rem; margin: 0; flex: 1; }
.post-card-meta { display: flex; align-items: center; gap: 0.6rem; font-size: 0.82rem; color: var(--faint); margin-top: 0.4rem; }

/* Featured card */
.featured-card {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}
.featured-cover { display: flex; align-items: center; justify-content: center; min-height: 280px; position: relative; overflow: hidden; }
.featured-cover .cover-glyph { font-size: 3.5rem; }
.featured-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.22) 1.2px, transparent 1.2px);
  background-size: 18px 18px;
}
.featured-body { padding: 2.2rem; display: flex; flex-direction: column; gap: 0.9rem; }
.featured-body h3 { font-size: 1.7rem; margin: 0; }
.featured-body h3 a { color: var(--text); }
.featured-body h3 a:hover { color: var(--accent); text-decoration: none; }
.featured-body p { color: var(--muted); margin: 0; }
.featured-body .btn { align-self: flex-start; margin-top: 0.6rem; }

/* ---------- 7. Pagination, tags, archive, search, projects ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.page-numbers { display: flex; gap: 0.4rem; align-items: center; }
.page-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 0.6rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-weight: 700;
}
.page-number:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.page-number.current { background: var(--accent); border-color: var(--accent); color: #fff; }
[data-theme="dark"] .page-number.current { color: #0b0f19; }

/* Tag pills & cloud */
.tag-pill {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent) !important;
  font-size: 0.85rem;
  font-weight: 700;
}
[data-theme="dark"] .tag-pill { color: var(--accent-hover) !important; }
.tag-pill:hover { text-decoration: none; filter: brightness(0.96); }

.tag-cloud { list-style: none; display: flex; flex-wrap: wrap; gap: 0.7rem; margin: 0; padding: 0; }
.tag-count {
  display: inline-block;
  min-width: 1.5em;
  text-align: center;
  background: rgba(127, 127, 127, 0.18);
  border-radius: 999px;
  font-size: 0.78em;
  padding: 0 0.4em;
  margin-left: 0.3em;
}

.tag-group { margin-bottom: 2.5rem; }
.tag-group h2 { font-size: 1.4rem; margin-bottom: 1rem; }
.tag-group h2 .tag-count { font-size: 0.8rem; vertical-align: middle; }

/* Archive */
.archive-year { margin-bottom: 2.5rem; }
.archive-year h2 { font-size: 1.6rem; border-bottom: 2px solid var(--border); padding-bottom: 0.5rem; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li {
  display: flex;
  gap: 1.2rem;
  align-items: baseline;
  padding: 0.7rem 0;
  border-bottom: 1px dashed var(--border);
}
.archive-list li:last-child { border-bottom: none; }
.archive-date { flex-shrink: 0; width: 5.5rem; color: var(--faint); font-size: 0.88rem; font-family: var(--font-mono); }
.archive-list a { font-weight: 600; color: var(--text); }
.archive-list a:hover { color: var(--accent); }

/* Search */
.search-box { display: flex; gap: 0.6rem; margin: 1.5rem 0; }
.search-input {
  flex: 1;
  padding: 0.8rem 1.1rem;
  font-size: 1rem;
  border: 2px solid var(--border-strong);
  border-radius: 12px;
  background: var(--bg-raised);
  color: var(--text);
  font-family: inherit;
}
.search-input:focus { outline: none; border-color: var(--accent); }
.search-result {
  display: block;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  background: var(--bg-raised);
  color: var(--text);
}
.search-result:hover { text-decoration: none; border-color: var(--accent); }
.search-result h3 { margin: 0 0 0.3rem; font-size: 1.1rem; }
.search-result p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.search-result mark { background: var(--accent-soft); color: var(--accent); border-radius: 3px; padding: 0 2px; }
[data-theme="dark"] .search-result mark { color: var(--accent-hover); }
.search-meta { font-size: 0.8rem; color: var(--faint); margin-bottom: 1.2rem; }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-raised);
  box-shadow: var(--card-shadow);
}
.project-card h3 { margin: 0; font-size: 1.2rem; display: flex; align-items: center; gap: 0.6rem; }
.project-card p { color: var(--muted); font-size: 0.95rem; margin: 0; flex: 1; }
.project-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; font-size: 0.8rem; color: var(--faint); }
.lang-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); display: inline-block; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.project-tags span { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 6px; padding: 0.1rem 0.5rem; font-size: 0.78rem; color: var(--muted); }
.project-links { display: flex; gap: 1rem; font-weight: 700; font-size: 0.9rem; }
.featured-badge {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

/* ---------- 8. Subscribe / about teaser ---------- */
.topics-section { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.about-teaser-inner { display: flex; gap: 2rem; align-items: center; }
.teaser-avatar { border-radius: 24px; flex-shrink: 0; box-shadow: var(--card-shadow); }
.about-teaser h2 { font-size: 1.6rem; }

.subscribe-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2.5rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #1e1b4b, #4c1d95);
  color: #fff;
}
.subscribe-card h2 { margin-bottom: 0.4rem; }
.subscribe-card p { color: #c4b5fd; margin: 0; }
.subscribe-actions { display: flex; gap: 0.8rem; flex-shrink: 0; flex-wrap: wrap; }
.subscribe-card .btn-primary { background: #fff; color: #1e1b4b !important; }
.subscribe-card .btn-primary:hover { background: #e0e7ff; }
.subscribe-card .btn-outline { border-color: rgba(255, 255, 255, 0.4); color: #fff !important; }
.subscribe-card .btn-outline:hover { border-color: #fff; color: #fff !important; }

/* ---------- 9. Footer, back-to-top ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); margin-top: 2rem; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding: 3.5rem 1.5rem 2.5rem;
}
.footer-brand, .footer-topics, .footer-recent { min-width: 0; }
.footer-logo { font-size: 1.3rem; font-weight: 800; margin: 0 0 0.4rem; }
.footer-tagline { color: var(--muted); font-size: 0.92rem; }
.footer-heading { font-size: 0.8rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin: 0 0 1rem; }
.footer-nav ul, .footer-recent ul, .footer-tag-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.footer-nav a, .footer-recent a, .footer-tag-list a { color: var(--muted); font-size: 0.93rem; }
.footer-nav a:hover, .footer-recent a:hover, .footer-tag-list a:hover { color: var(--accent); }

.social-links { display: flex; gap: 0.6rem; margin-top: 1.1rem; }
.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: var(--bg-raised);
}
.social-links a:hover { color: var(--accent); border-color: var(--accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--faint);
}
.footer-bottom p { margin: 0; }

.to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-raised);
  color: var(--text);
  box-shadow: var(--card-shadow);
  cursor: pointer;
  z-index: 40;
}
.to-top:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 10. Post layout ---------- */
.reading-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 60; background: transparent; }
.reading-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.post-header { padding: 3.5rem 0 2rem; }
.post-tags { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.2rem; }
.post-title { font-size: clamp(2rem, 5vw, 2.9rem); }
.post-meta { display: flex; align-items: center; gap: 0.9rem; margin-top: 1.6rem; }
.post-avatar { border-radius: 50%; }
.post-author { margin: 0; font-weight: 700; }
.post-date { margin: 0; color: var(--muted); font-size: 0.9rem; }

.post-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, var(--max-narrow));
  gap: 3rem;
  justify-content: center;
  align-items: start;
}

.toc { position: sticky; top: 96px; max-height: calc(100vh - 120px); overflow: auto; font-size: 0.88rem; }
.toc-title { font-weight: 800; font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin-bottom: 0.8rem; }
.toc ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.15rem; }
.toc ul ul { padding-left: 1rem; }
.toc a { display: block; color: var(--muted); padding: 0.25rem 0 0.25rem 0.9rem; border-left: 2px solid var(--border); }
.toc a:hover { color: var(--accent); text-decoration: none; }
.toc a.active { color: var(--accent); border-left-color: var(--accent); font-weight: 700; }
.toc-empty { color: var(--faint); font-size: 0.85rem; }

.post-footer { margin-top: 3rem; padding-bottom: 4rem; display: flex; flex-direction: column; gap: 2.5rem; }

/* Share */
.share {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.share-label { font-weight: 800; }
.share-buttons { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.share-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--bg-raised);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* Author box */
.author-box {
  display: flex;
  gap: 1.3rem;
  padding: 1.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-raised);
}
.author-avatar { border-radius: 16px; flex-shrink: 0; }
.author-info { min-width: 0; }
.author-label { font-size: 0.78rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin: 0 0 0.2rem; }
.author-name { font-size: 1.15rem; font-weight: 800; margin: 0 0 0.4rem; }
.author-bio { color: var(--muted); font-size: 0.95rem; margin: 0 0 0.8rem; }
.author-links { display: flex; gap: 1.2rem; margin: 0; font-weight: 700; font-size: 0.9rem; }

/* Prev / next */
.prev-next { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.prev-next-item {
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-raised);
}
.prev-next-item:empty { visibility: hidden; }
.prev-next-item.next { text-align: right; }
.prev-next-label { display: block; font-size: 0.8rem; font-weight: 700; color: var(--faint); margin-bottom: 0.3rem; }
.prev-next-item a { font-weight: 700; color: var(--text); }
.prev-next-item a:hover { color: var(--accent); }

/* Related */
.related h2 { font-size: 1.4rem; margin-bottom: 1.2rem; }
.cards-grid-3 { grid-template-columns: repeat(3, 1fr); }

/* Comments */
.comments { border-top: 1px solid var(--border); padding-top: 1rem; }
.comments h2 { font-size: 1.4rem; }

/* Page hero */
.page-hero { padding: 3.5rem 0 1.5rem; }
.page-title { font-size: clamp(2rem, 5vw, 2.7rem); }
.page-content { padding-bottom: 4rem; }
.page-content.prose > *:first-child { margin-top: 1.5rem; }

/* ---------- 11. Prose ---------- */
.prose { font-size: 1.08rem; line-height: 1.75; overflow-wrap: break-word; }
.prose > *:first-child { margin-top: 0; }
.prose h2 { font-size: 1.65rem; margin-top: 2.4em; padding-top: 0.4em; border-top: 1px solid var(--border); }
.prose h2:first-child { border-top: none; margin-top: 0; padding-top: 0; }
.prose h3 { font-size: 1.3rem; margin-top: 1.8em; }
.prose h4 { font-size: 1.1rem; margin-top: 1.6em; }

.heading-anchor {
  margin-left: 0.4rem;
  opacity: 0;
  color: var(--faint);
  font-weight: 400;
  text-decoration: none !important;
}
h2:hover .heading-anchor, h3:hover .heading-anchor, h4:hover .heading-anchor { opacity: 1; }
.heading-anchor:hover { color: var(--accent); }

.prose p { margin-bottom: 1.25em; }
.prose ul, .prose ol { padding-left: 1.5rem; margin-bottom: 1.25em; }
.prose li { margin-bottom: 0.45em; }
.prose li::marker { color: var(--accent); }

.prose blockquote {
  margin: 1.6em 0;
  padding: 0.4em 1.2em;
  border-left: 4px solid var(--border-strong);
  color: var(--muted);
  font-style: italic;
}
.prose blockquote p:last-child { margin-bottom: 0.6em; }

/* Callout: > text\n{: .callout} */
.prose .callout {
  border: 1px solid var(--callout-border);
  border-left-width: 5px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--callout-bg);
  padding: 1em 1.3em;
  font-style: normal;
  color: var(--text);
}
.prose .callout p:last-child { margin-bottom: 0.4em; }

.prose hr { border: none; border-top: 2px solid var(--border); margin: 2.5em auto; width: 40%; }

.prose table { width: 100%; border-collapse: collapse; margin: 1.6em 0; font-size: 0.95rem; display: block; overflow-x: auto; }
.prose thead { border-bottom: 2px solid var(--border-strong); }
.prose th { text-align: left; padding: 0.6rem 0.9rem; }
.prose td { padding: 0.6rem 0.9rem; border-bottom: 1px solid var(--border); }
.prose tbody tr:hover { background: var(--bg-soft); }

.prose img { border-radius: var(--radius-sm); border: 1px solid var(--border); }

.prose .lead { font-size: 1.2em; }

/* Inline + block code */
.prose code, code.highlighter-rouge {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--code-bg);
  color: var(--code-text);
  border: 1px solid var(--code-border);
  border-radius: 6px;
  padding: 0.15em 0.4em;
}

.prose pre { position: relative; }
div.highlighter-rouge, .prose div.highlighter-rouge { margin: 1.6em 0; }
.highlight {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-sm);
  overflow: auto;
}
.highlight pre {
  margin: 0;
  padding: 1.1rem 1.3rem;
  font-family: var(--font-mono);
  font-size: 0.87rem;
  line-height: 1.6;
  background: transparent;
  border: none;
}
.highlight pre code, .highlight code { background: transparent; border: none; padding: 0; color: inherit; font-size: inherit; }

.code-block-wrapper { position: relative; }
.copy-code-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-sans);
  border-radius: 7px;
  border: 1px solid var(--border-strong);
  background: var(--bg-raised);
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.code-block-wrapper:hover .copy-code-btn, .copy-code-btn:focus-visible { opacity: 1; }
.copy-code-btn:hover { color: var(--accent); border-color: var(--accent); }

/* Footnotes (kramdown) */
.footnotes { font-size: 0.9rem; color: var(--muted); border-top: 1px solid var(--border); margin-top: 2.5em; padding-top: 1em; }
.footnotes ol { padding-left: 1.3rem; }

/* Task lists (GFM) */
.prose ul.task-list { list-style: none; padding-left: 0.2rem; }
.prose ul.task-list input { margin-right: 0.5rem; accent-color: var(--accent); }

/* Skills chips (about page) */
.skills { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1rem 0 1.6rem; padding: 0; list-style: none; }
.skills li {
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0;
}

/* Timeline (about page) */
.timeline { list-style: none; margin: 1rem 0 1.6rem; padding: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: var(--border); }
.timeline li { position: relative; padding: 0 0 1.4rem 2rem; margin: 0; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 4px solid var(--accent);
}
.timeline .timeline-year { font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent); font-weight: 700; }
.timeline strong { display: block; margin: 0.1rem 0 0.2rem; }
.timeline p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ---------- 12. Code highlighting (rouge tokens) ---------- */
/* Light theme: GitHub-ish palette */
.highlight .c, .highlight .cm, .highlight .c1, .highlight .cs { color: #6a737d; font-style: italic; }
.highlight .k, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kt { color: #d73a49; }
.highlight .o, .highlight .ow { color: #d73a49; }
.highlight .n, .highlight .na, .highlight .nb, .highlight .nc, .highlight .no, .highlight .nd, .highlight .ni, .highlight .ne, .highlight .nf, .highlight .nl, .highlight .nn, .highlight .nx, .highlight .py, .highlight .nt, .highlight .nv, .highlight .vc, .highlight .vg, .highlight .vi { color: #24292e; }
.highlight .nf, .highlight .nn { color: #6f42c1; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sc, .highlight .sd, .highlight .se, .highlight .sh, .highlight .si, .highlight .sx, .highlight .sr { color: #032f62; }
.highlight .m, .highlight .mf, .highlight .mh, .highlight .mi, .highlight .mo, .highlight .il { color: #005cc5; }
.highlight .p { color: #24292e; }
.highlight .err { color: #b31d28; background: #ffeef0; }
.highlight .gd { color: #b31d28; background: #ffeef0; }
.highlight .gi { color: #22863a; background: #f0fff4; }
.highlight .ge { font-style: italic; }
.highlight .gs { font-weight: 700; }

/* Dark theme: OneDark-ish palette */
[data-theme="dark"] .highlight .c,
[data-theme="dark"] .highlight .cm,
[data-theme="dark"] .highlight .c1,
[data-theme="dark"] .highlight .cs { color: #7f848e; }
[data-theme="dark"] .highlight .k,
[data-theme="dark"] .highlight .kd,
[data-theme="dark"] .highlight .kn,
[data-theme="dark"] .highlight .kp,
[data-theme="dark"] .highlight .kr,
[data-theme="dark"] .highlight .kt { color: #c678dd; }
[data-theme="dark"] .highlight .o,
[data-theme="dark"] .highlight .ow { color: #56b6c2; }
[data-theme="dark"] .highlight .n,
[data-theme="dark"] .highlight .na,
[data-theme="dark"] .highlight .nb,
[data-theme="dark"] .highlight .nc,
[data-theme="dark"] .highlight .no,
[data-theme="dark"] .highlight .nd,
[data-theme="dark"] .highlight .ni,
[data-theme="dark"] .highlight .ne,
[data-theme="dark"] .highlight .nf,
[data-theme="dark"] .highlight .nl,
[data-theme="dark"] .highlight .nn,
[data-theme="dark"] .highlight .nx,
[data-theme="dark"] .highlight .py,
[data-theme="dark"] .highlight .nt,
[data-theme="dark"] .highlight .nv,
[data-theme="dark"] .highlight .vc,
[data-theme="dark"] .highlight .vg,
[data-theme="dark"] .highlight .vi { color: #abb2bf; }
[data-theme="dark"] .highlight .nf,
[data-theme="dark"] .highlight .nn { color: #61afef; }
[data-theme="dark"] .highlight .s,
[data-theme="dark"] .highlight .s1,
[data-theme="dark"] .highlight .s2,
[data-theme="dark"] .highlight .sb,
[data-theme="dark"] .highlight .sc,
[data-theme="dark"] .highlight .sd,
[data-theme="dark"] .highlight .se,
[data-theme="dark"] .highlight .sh,
[data-theme="dark"] .highlight .si,
[data-theme="dark"] .highlight .sx,
[data-theme="dark"] .highlight .sr { color: #98c379; }
[data-theme="dark"] .highlight .m,
[data-theme="dark"] .highlight .mf,
[data-theme="dark"] .highlight .mh,
[data-theme="dark"] .highlight .mi,
[data-theme="dark"] .highlight .mo,
[data-theme="dark"] .highlight .il { color: #d19a66; }
[data-theme="dark"] .highlight .p { color: #abb2bf; }
[data-theme="dark"] .highlight .err { color: #f44747; background: transparent; }
[data-theme="dark"] .highlight .gd { color: #e06c75; }
[data-theme="dark"] .highlight .gi { color: #98c379; }

/* ---------- 13. 404 ---------- */
.not-found { text-align: center; padding: 5rem 0; }
.not-found-code {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  line-height: 1;
  margin: 0 0 1rem;
}
.not-found h1 { font-size: 1.8rem; }
.not-found p { color: var(--muted); }
.not-found-links { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; margin: 1.8rem 0 3rem; }
.not-found-posts { text-align: left; max-width: 640px; margin: 0 auto; }
.not-found-posts h2 { font-size: 1.2rem; }

/* ---------- 14. Responsive ---------- */
@media (max-width: 1020px) {
  .post-layout { grid-template-columns: minmax(0, var(--max-narrow)); }
  .toc { display: none; }
  .cards-grid-3 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
}

@media (max-width: 860px) {
  .site-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .terminal { transform: none; max-width: 560px; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-cover { min-height: 180px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .subscribe-card { flex-direction: column; align-items: flex-start; }
  .about-teaser-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 600px) {
  body { font-size: 1rem; }
  .section { padding: 3rem 0; }
  .hero { padding: 3rem 0 2.5rem; }
  .hero-stats { gap: 1.5rem; }
  .pagination { justify-content: center; }
  .pagination .page-numbers { order: 3; width: 100%; justify-content: center; }
  .prev-next { grid-template-columns: 1fr; }
  .prev-next-item.next { text-align: left; }
  .author-box { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .archive-list li { flex-direction: column; gap: 0.1rem; }
  .archive-date { width: auto; }
  .search-box { flex-direction: column; }
}

/* ---------- 15. Motion preferences & print ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .terminal { transform: none; }
}

@media print {
  .site-header, .site-footer, .to-top, .share, .comments,
  .reading-progress, .toc, .prev-next, .related, .subscribe-section { display: none !important; }
  body { font-size: 11pt; color: #000; background: #fff; }
  .prose a { color: #000; text-decoration: underline; }
}